10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

____________________________________________________________

FORM 10-K

____________________________________________________________

☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2023

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                        to                         

Commission File No. 001-36609

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NORTHERN TRUST CORPORATION

(Exact name of registrant as specified in its charter)

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Delaware	36-2723087
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

50 South La Salle Street
Chicago,	Illinois	60603
(Address of principal executive offices)		(Zip Code)

Registrant’s telephone number, including area code: (312) 630-6000

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Securities registered pursuant to Section 12(b) of the Act:

Title of Each Class	Trading Symbol	Name of Each Exchange On Which Registered
Common Stock, $1.66 2/3 Par Value	NTRS	The NASDAQ Stock Market LLC
Depositary Shares, each representing 1/1,000th interest in a share of Series E Non-Cumulative Perpetual Preferred Stock	NTRSO	The NASDAQ Stock Market LLC

Securities registered pursuant to Section 12(g) of the Act: None

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Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  ☒    No  ☐

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes  ☐    No  ☒

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ☒    No  ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes  ☒    No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	☒	Accelerated filer	☐	Emerging growth company	☐
Non-accelerated filer	☐	Smaller reporting company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☒

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements. □

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b). □

Indicate by check mark whether the registrant is a shell company (as defined in Exchange Act Rule 12b-2).    Yes ☐    No  ☒

The aggregate market value of the registrant’s common stock as of June 30, 2023 (the last business day of the registrant’s most recently completed second quarter), based upon the last sale price of the common stock at June 30, 2023 as reported by The NASDAQ Stock Market LLC, held by non-affiliates was approximately $15.3 billion. Determination of stock ownership by non-affiliates was made solely for the purpose of responding to this requirement and the registrant is not bound by this determination for any other purpose.

At January 31, 2024, 204,841,515 shares of common stock, $1.66 2/3 par value, were outstanding.

Portions of the registrant’s Proxy Statement for its 2024 Annual Meeting of Stockholders are incorporated by reference into Part III hereof.

NORTHERN TRUST CORPORATION

FORM 10-K

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

		Page
PART I
Item 1	Business	1
Item 1A	Risk Factors	14
Item 1B	Unresolved Staff Comments	32
Item 1C	Cybersecurity	33
Item 2	Properties	34
Item 3	Legal Proceedings	34
Item 4	Mine Safety Disclosures	34
Supplemental Item	Information About Our Executive Officers	35
PART II
Item 5	Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	37
Item 6	Reserved	38
Item 7	Management’s Discussion and Analysis of Financial Condition and Results of Operations	39
Item 7A	Quantitative and Qualitative Disclosures About Market Risk	95
Item 8	Financial Statements and Supplementary Data	95
Item 9	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	172
Item 9A	Controls and Procedures	172
Item 9B	Other Information	174
Item 9C	Disclosure Regarding Foreign Jurisdictions that Prevent Inspections	174
PART III
Item 10	Directors, Executive Officers and Corporate Governance	174
Item 11	Executive Compensation	174
Item 12	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	174
Item 13	Certain Relationships and Related Transactions, and Director Independence	174
Item 14	Principal Accountant Fees and Services	174
PART IV
Item 15	Exhibits and Financial Statement Schedules	175
Item 16	Form 10-K Summary	178
Signatures		179

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GLOSSARY OF TERMS

When the following terms and abbreviations appear in the text of this report, they have the meanings indicated below:

AFS	Available for Sale
AIFMD	Alternative Investment Fund Managers Directive
ALCO	Asset and Liability Management Committee
AMA	Basel Advanced Measurement Approach
AML	Anti-Money Laundering
AOCI	Accumulated Other Comprehensive Income
AS	Asset Servicing
ASC	Accounting Standards Codification
ASU	Accounting Standards Update
AUC/A	Assets Under Custody/Administration
AUM	Assets Under Management
Bank	The Northern Trust Company
Banking book	Northern Trust’s structural assets, liabilities, net investments, and off-balance sheet instruments subject to interest rate risk and/or foreign currency risk. It is distinct from the trading book.
Basel Committee	International Basel Committee on Banking Supervision
Basel III	Industry-standard guidelines published by the Basel Committee
Basel III Endgame Proposal	Proposed rule issued by U.S. banking agencies to implement the Basel III endgame agreement for large banks
BMR	European Union Benchmarks Regulation
Brexit	The withdrawal of the United Kingdom from the European Union
BRRD	Bank Recovery and Resolution Directive (EU)
Business Risk Committee	Business Risk Committee of the Board of Directors
CCAR	Comprehensive Capital Analysis and Review
CCPA	California Consumer Privacy Act, as amended
CDFIs	Community Development Financial Institutions
CEOC	Compliance & Ethics Oversight Committee
CFPB	Consumer Financial Protection Bureau
CFTC	U.S. Commodity Futures Trading Commission
Corporation	Northern Trust Corporation
CRA	Community Reinvestment Act
CRC	Credit Risk Committee
CRD	Capital Requirements Directive of June 26, 2013 (EU)
CRO	Chief Risk Officer
CRR	Capital Requirements Regulation of June 26, 2013 (EU)
CSD	Central Securities Depositories
CSDR	Central Securities Depositories Regulation (EU)
CSSF	Commission de Surveillance du Secteur Financier (Luxembourg)
DE&I	Diversity, Equity, and Inclusion
DFAST	Dodd-Frank Act Stress Tests
DGS	Deposit Guarantee Schemes
DGSD	Deposit Guarantee Schemes Directive
DIF	Federal Deposit Insurance Corporation’s Deposit Insurance Fund
Dodd-Frank Act	Dodd-Frank Wall Street Reform and Consumer Protection Act
ECB	European Central Bank
EEA	European Economic Area
EMIR	European Market Infrastructure Regulation 648/2012
EOP	End of Period

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GLOSSARY OF TERMS (continued)

ESG	Environmental, Social and Governance
EU	European Union
Exchange Act	Securities Exchange Act of 1934, as amended
FASB	Financial Accounting Standards Board
FCA	Financial Conduct Authority
FDIA	Federal Deposit Insurance Act
FDIC	Federal Deposit Insurance Corporation
Federal Reserve Board	The Board of Governors of the Federal Reserve System
FICC	Fixed Income Clearing Corporation
FinCEN	Financial Crimes Enforcement Network
FINRA	Financial Industry Regulatory Authority
FRC	Fiduciary Risk Committee
FTE	Fully Taxable Equivalent
FTP	Funds Transfer Pricing
FX	Foreign Exchange
GAAP	Generally Accepted Accounting Principles
GDPR	General Data Protection Regulation
GERC	Global Enterprise Risk Committee
GFX	Global Foreign Exchange
GILTI	Global Intangible Low-Taxed Income
GSIB	Global Systemically Important Banks
HTM	Held to Maturity
HQLAs	High-Quality Liquid Assets
IBA	ICE Benchmark Administration
Investment Advisers Act	Investment Advisers Act of 1940, as amended
IR	Interest Rate
IRD	Interest Rate Derivative
ITRC	Information Technology Risk Committee
LCR	Liquidity Coverage Ratio
LCR Final Rule	Regulation promulgated by U.S. federal banking regulators to implement LCR requirements in the United States for certain banking organizations.
LGD	Loss Given Default
LIBOR	London Interbank Offered Rate
LIBOR Act	Adjustable Interest Rate (LIBOR) Act
MD&A	Management’s Discussion and Analysis
MIFID	Market in Financial Instruments Directive
MIFIR	Markets in Financial Instruments Regulation
MLD5	Fifth EU Money Laundering Directive
MLRC	Market & Liquidity Risk Committee
MREL	Minimum requirements for own funds and eligible liabilities (EU)
MROC	Model Risk Oversight Committee
MSDC	Macroeconomic Scenario Development Committee
MVE	Market Value of Equity
NAICS	North American Industry Classification System
NAV	Net Asset Value
NFA	National Futures Association
NFTS	Northern Trust Fiduciary Services (Guernsey) Limited
NII	Net Interest Income

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION iii

GLOSSARY OF TERMS (continued)

N/M	Not Meaningful
NSFR	Net Stable Funding Ratio requirement in the United States
NSFR Final Rule	Regulation promulgated by U.S. federal banking regulators to implement NSFR requirements in the United States for certain banking organizations.
OFAC	U.S. Department of the Treasury’s Office of Foreign Assets Control
ORC	Operational Risk Committee
OREO	Other Real Estate Owned
OTC	Over-the-Counter
PD	Probability of Default
PIPL	Personal Information Protection Law (China)
PRA	Prudential Regulation Authority
ROU	Right-of-use
RWA	Risk-Weighted Assets
SEC	U.S. Securities and Exchange Commission
Series D Preferred Stock	Series D Non-Cumulative Perpetual Preferred Stock
Series E Preferred Stock	Series E Non-Cumulative Perpetual Preferred Stock
SOFR	Secured Overnight Finance Rate
SFDR	Sustainable Finance Disclosure Regulations (EU)
SRD II	Shareholder Rights Directive (EU)
SFTR	Securities Financing Transactions and Reuse of Collateral
Taxonomy Regulations	Regulation (EU) 2020/852
TDR	Troubled Debt Restructuring
Trading book	Foreign (non-U.S.) currency trading positions subject to foreign currency risk, as well as trading securities and interest rate derivative transactions, both subject to interest rate risk.
UCITS	Undertakings for the Collective Investment in Transferable Securities
UK	United Kingdom
UK GDPR	General Data Protection Regulation in the UK
USD LIBOR	U.S. Dollar LIBOR
VaR	Value-at-Risk
VIE	Variable Interest Entity
WM	Wealth Management
WRC	Workforce Risk Committee

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PART I

ITEM 1 – BUSINESS

Northern Trust Corporation

Northern Trust Corporation (Corporation) is a leading provider of wealth management, asset servicing, asset management and banking solutions to corporations, institutions, families and individuals. The Corporation is a financial holding company conducting business through various U.S. and non-U.S. subsidiaries, including The Northern Trust Company (Bank).

The Bank is an Illinois banking corporation headquartered in Chicago and the Corporation’s principal subsidiary. Founded in 1889, the Bank conducts its business through its U.S. operations and its various U.S. and non-U.S. branches and subsidiaries. At December 31, 2023, the Bank had consolidated assets of $150.3 billion and common bank equity capital of $11.6 billion.

The Corporation was formed as a holding company for the Bank in 1971. The Corporation has a global presence with offices in 24 U.S. states and Washington, D.C., and across 22 locations in Canada, Europe, the Middle East and the Asia-Pacific region. At December 31, 2023, the Corporation had consolidated total assets of $150.8 billion and stockholders’ equity of $11.9 billion.

The Corporation expects that the Bank will continue in the foreseeable future to be the major source of the Corporation’s consolidated assets, revenues, and net income. Except where the context otherwise requires, references to “Northern Trust,” “we,” “us,” “our,” “its,” or similar terms mean Northern Trust Corporation and its subsidiaries on a consolidated basis.

Business Overview

Northern Trust focuses on managing and servicing client assets through its two client-focused reporting segments: Asset Servicing and Wealth Management. Asset management and related services are provided to Asset Servicing and Wealth Management clients primarily by the Asset Management business. The revenue and expenses of Asset Management and certain other support functions are allocated fully to Asset Servicing and Wealth Management. Northern Trust reports certain income and expense items not allocated to Asset Servicing and Wealth Management in a third reporting segment, Other.

ASSET SERVICING

Asset Servicing is a leading global provider of asset servicing and related services to corporate and public retirement funds, foundations, endowments, fund managers, insurance companies, sovereign wealth funds, and other institutional investors around the globe. Asset servicing and related services encompass a full range of capabilities including but not limited to: custody; fund administration; investment operations outsourcing; investment management; investment risk and analytical services; employee benefit services; securities lending; foreign exchange; treasury management; brokerage services; transition management services; banking; and cash management. Client relationships are managed through the Bank and the Bank’s and the Corporation’s other subsidiaries, including support from locations in North America, Europe, the Middle East, and the Asia-Pacific region. At December 31, 2023, total Asset Servicing assets under custody/administration (AUC/A), assets under custody, and assets under management (AUM) were $14.36 trillion, $10.88 trillion, and $1.03 trillion, respectively.

WEALTH MANAGEMENT

Wealth Management focuses on high-net-worth individuals and families, business owners, executives, professionals, retirees, and established privately-held businesses in its target markets. In supporting these targeted segments, Wealth Management provides trust, investment management, custody, and philanthropic services; financial consulting; guardianship and estate administration; family business consulting; family financial education; brokerage services; and private and business banking. Wealth Management also includes Global Family Office, which provides customized services, including but not limited to: investment consulting; global custody; fiduciary; and private banking; family office consulting, and technology solutions, to meet the complex financial and reporting needs of ultra-high-net-worth individuals and family offices across the globe.

Wealth Management is one of the largest providers of advisory services in the United States, with AUC/A, assets under custody, and AUM of $1.04 trillion, $1.03 trillion, and $402.5 billion, respectively, at December 31, 2023. Wealth Management services are delivered by multidisciplinary teams through a network of offices in 19 U.S. states and Washington, D.C., as well as offices in London, Guernsey, and Abu Dhabi.

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ASSET MANAGEMENT

Asset Management, through the Corporation’s various subsidiaries, supports the Asset Servicing and Wealth Management reporting segments by providing a broad range of asset management and related services and other products to clients around the world. Investment solutions are delivered through separately managed accounts, bank common and collective funds, registered investment companies, exchange traded funds, non-U.S. collective investment funds, and unregistered private investment funds. Asset Management’s capabilities include active and passive equity; active and passive fixed income; cash management; multi-asset and alternative asset classes (such as private equity and hedge funds of funds); and multi-manager advisory services and products. Asset Management’s activities also include overlay services and other risk management services. Asset Management operates internationally through subsidiaries and distribution arrangements and its revenue and expense are fully allocated to Asset Servicing and Wealth Management. As discussed above, Northern Trust managed $1.43 trillion in assets as of December 31, 2023, including $1.03 trillion for Asset Servicing clients and $402.5 billion for Wealth Management clients.

Competition

Northern Trust faces intense competition in all aspects and areas of its business. Competition comes from both regulated and unregulated financial services organizations, whose products and services span the local, national, and global markets in which Northern Trust conducts operations. Our competitors include a broad range of financial institutions and service companies, including other custodial banks, investment counseling firms, deposit-taking institutions, asset management firms, benefits consultants, trust companies, investment banking firms, insurance companies, and various financial technology companies, including software providers and data services firms. As our businesses grow and markets evolve, we may encounter increasing and new forms of competition around the world.

Northern Trust’s business strategy is to provide quality financial services to targeted market segments in which it believes it has a competitive advantage and favorable growth prospects. As part of this strategy, Northern Trust seeks to differentiate itself from its competitors with premier, holistic solutions and exceptional experiences tailored to meet clients’ needs. In addition, Northern Trust emphasizes the development and growth of recurring and scalable sources of fee-based income and continual productivity improvements. Northern Trust also seeks to maintain its foundational strength with a strong, conservative balance sheet and a globally respected brand.

Economic Conditions And Government Policies

The earnings of Northern Trust are affected by numerous external influences. Chief among these are general economic conditions, both domestic and international, and actions that governments and their central banks take in managing their economies. These general conditions affect all of Northern Trust’s businesses, as well as the quality, value, and profitability of its loan and investment portfolios.

The Board of Governors of the Federal Reserve System (Federal Reserve Board) implements monetary policy through its open market operations in United States Government securities, its setting of the discount rate at which member banks may borrow from Federal Reserve Banks, and its changes in the reserve requirements for deposits. The policies adopted by the Federal Reserve Board directly affect interest rates and therefore what banks earn on their loans and investments and what they pay on their savings and time deposits and other purchased funds.

Supervision and Regulation

Northern Trust is subject to extensive regulation under state and federal laws in the United States and in each of the jurisdictions in which it does business. The descriptions below outline significant elements of selected laws and regulations applicable to Northern Trust and are qualified in their entirety by reference to the particular statutory or regulatory provisions summarized. These descriptions do not summarize all laws and regulations applicable to Northern Trust or all possible or proposed changes to such laws or regulations and are not intended to be a substitute for the related statutes or regulatory provisions.

Changes in laws or regulations applicable to Northern Trust may have a material effect on its businesses and results of operations. The scope of the laws and regulations, and the intensity of the supervision to which Northern Trust is subject have increased in recent years, initially in response to the financial crisis, and more recently in light of other factors, including the banking turmoil in early 2023, technological factors, market changes, and climate change concerns. Regulatory enforcement and fines have also increased across the banking and financial services sector. Northern Trust expects that its business will remain subject to extensive regulation and heightened supervision.

FINANCIAL HOLDING COMPANY REGULATION

Under U.S. law, the Corporation is a bank holding company that has elected to be a financial holding company subject to the supervision, examination, and regulation of the Federal Reserve Board. A financial holding company is permitted to engage in a broader range of financial activities than a bank holding company. The Federal Reserve Board has authority to limit the activities that a financial holding company may conduct if any depository institution controlled by the financial

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holding company is found to no longer be “well-capitalized” and “well-managed” or has not received at least a “satisfactory” rating in its most recent Community Reinvestment Act (CRA) examination. Failure to meet one or more of these requirements may result in restrictions on the Corporation’s ability to exercise powers granted to financial holding companies, to engage in new activities, to continue current activities, or to make acquisitions.

SUBSIDIARY REGULATION

The Bank is a member of the Federal Reserve System, with deposits insured by the Federal Deposit Insurance Corporation (FDIC), and is subject to regulation by both agencies. As an Illinois banking corporation, the Bank is also subject to Illinois state laws and regulations and to examination and supervision by the Division of Banking of the Illinois Department of Financial and Professional Regulation. The Bank is also registered as a transfer agent with the Federal Reserve Board and is registered as a swap dealer with the U.S. Commodity Futures Trading Commission (CFTC) under the Commodity Exchange Act. As a result, the Bank is subject to supervision, examination and enforcement by certain other regulatory bodies, including the CFTC and the National Futures Association (NFA). The Corporation’s nonbanking affiliates are subject to examination by the Federal Reserve Board and, in certain circumstances, other functional regulators, as discussed in greater detail below.

ENHANCED PRUDENTIAL STANDARDS

Under the Federal Reserve Board’s tailoring rules, the Corporation is subject to the enhanced prudential standards applicable to Category II banking organizations. As a Category II institution, the Corporation must submit annual capital plans to the Federal Reserve Board, conduct supervisory and internal periodic stress tests to evaluate capital adequacy in adverse economic conditions, maintain enhanced risk management procedures, comply with a liquidity risk management framework (discussed below in “Liquidity Standards”) and single counterparty credit limits, conduct liquidity stress tests, and hold a buffer of liquid assets estimated to meet funding needs during a financial stress event. The Corporation is not subject to all of the standards applicable to U.S. bank holding companies that are global systemically important bank holding companies (GSIBs), such as the total loss-absorbing capacity requirement, capital surcharge, enhanced supplementary leverage ratio, or additional single counterparty credit limits.

LONG-TERM DEBT AND CLEAN HOLDING COMPANY REQUIREMENTS

In the summer of 2023, the U.S. banking regulators proposed a rule that would require banking organizations with $100 billion or more in total assets to comply with long-term debt requirements and clean holding company requirements similar to those that currently apply only to GSIBs. This proposal would also impose a long-term debt requirement on certain categories of insured depository institutions that are not consolidated subsidiaries of U.S. GSIBs, including insured depository institutions with $100 billion or more in total assets, such as the Bank. If adopted, this proposal would require the Corporation and the Bank to each maintain a minimum outstanding eligible long-term debt amount of no less than the greatest of (i) 6% of risk-weighted assets (RWAs), (ii) 2.5% of total leverage exposure, and (iii) 3.5% of average total consolidated assets. The Bank would be required to issue the minimum amount of eligible long-term debt to the Corporation, and the Corporation would be required to issue the minimum amount of eligible long-term debt externally. In addition, if adopted as proposed, the clean holding company requirement would limit or prohibit the Corporation from entering into certain transactions that could impede its orderly resolution, including, for example, prohibiting the Corporation from entering into transactions that could spread losses to subsidiaries and third parties, as well as limiting the amount of the Corporation’s liabilities that are not eligible long-term debt. The public comment period on this proposed rule ran through January 16, 2024.

RESOLUTION PLANNING

As required by Section 165(d) of the Dodd-Frank Wall Street Reform and Consumer Protection Act (Dodd-Frank Act), the Corporation is required to submit periodically to the Federal Reserve Board and FDIC a resolution plan for its rapid and orderly resolution in the event of material financial distress or failure. In August 2023, the Federal Reserve Board and FDIC proposed updated guidance on resolution planning requirements applicable to the Corporation under Section 165(d). The Corporation’s next 2024 165(d) plan submission is due to the FDIC and Federal Reserve Board by March 31, 2025.

In addition, the Bank, as an insured depository institution, is required to submit to the FDIC periodic plans for resolution in the event of its failure, with the next plan being due for submission on December 1, 2024. In August 2023, the FDIC issued a proposed rule that would require covered insured depository institutions, such as the Bank, to submit a full resolution plan to the FDIC every two years and submit an interim supplement in each year that it is not required to submit a full resolution plan. The proposed rule would also increase the content requirements for plan submissions and introduce a new credibility standard for the FDIC’s evaluation of resolution plans, which would be enforceable against the covered insured depository institutions.

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Separately, the European Union Bank Recovery and Resolution Directive (BRRD) sets out the framework for the recovery and resolution of European Union (EU) credit institutions and systemically-important investment firms, including certain of the Bank’s subsidiaries and branches. The BRRD establishes a set of harmonized rules for early intervention measures, recovery and resolution planning, bail-in powers and requirements for total loss absorbing capital for EU institutions, collectively known as minimum requirements for own funds and eligible liabilities (MREL). Northern Trust Global Services SE, a Luxembourg-incorporated indirect subsidiary of the Bank, is authorized and supervised by the European Central Bank (ECB) and subject to the prudential supervision of the ECB and the Luxembourg Commission de Surveillance du Secteur Financier (CSSF). As such, Northern Trust Global Services SE falls within the scope of the BRRD and its recovery and resolution planning is overseen by the CSSF and the Single Resolution Board (the resolution authority for ECB-supervised institutions).

The United Kingdom (UK) has established a special resolution regime and a resolvability assessment framework overseen by the Bank of England (as the UK resolution authority) with many similar features to the BRRD, which was substantially incorporated into UK law following the withdrawal of the UK from the EU. The special resolution regime applies to firms that are permitted to accept deposits under Part 4A of the Financial Services and Markets Act 2000. As such, the London branch of the Bank, as a UK branch of a third-country institution that accepts deposits, falls within the scope of the special resolution regime.

ORDERLY LIQUIDATION AUTHORITY.

Under the Dodd-Frank Act, certain financial companies, such as the Corporation and certain of its covered subsidiaries, can be subjected to an orderly liquidation authority if in default or danger of default and their resolution under the U.S. Bankruptcy Code would have serious adverse effects on financial stability in the United States, among other requirements set by statute. If the Corporation were subject to orderly liquidation authority, the FDIC would be appointed as its receiver, which would give the FDIC considerable powers to resolve the Corporation. Absent such actions, the Corporation, as a bank holding company, would remain subject to the U.S. Bankruptcy Code.

THE VOLCKER RULE.

The Volcker Rule generally prohibits banking entities, including the Bank and its affiliates, from engaging in proprietary trading, subject to certain exemptions and exclusions, such as for market-making, hedging, certain trading activities in U.S. and foreign sovereign debt, and trading activities related to liquidity management. The Volcker Rule also prohibits certain investments in, and relationships with, covered funds as defined in the Volcker Rule, such as hedge funds, private equity funds and similar funds, subject to a number of exemptions and exclusions. Northern Trust maintains an enterprise-wide compliance program to comply with the Volcker Rule.

HOLDING COMPANY AS A SOURCE OF STRENGTH

The Corporation, as a bank holding company, is required to serve as a source of financial and managerial strength to its depository institution subsidiary. Under this requirement, the Corporation could be required to commit resources to the Bank should the Bank experience financial distress.

PAYMENT OF DIVIDENDS

The Corporation may pay dividends, repurchase stock, and make other capital distributions only in accordance with the capital plan rules and capital adequacy standards of the Federal Reserve Board, including the stress capital buffer requirement, discussed further in “—Capital Adequacy Requirements” below. Dividends from the Bank are a significant source of funds for the Corporation, and the Corporation’s ability to pay dividends on its common stock therefore depends in part on the ability of the Bank to pay sufficient dividends to the Corporation.

Various other federal and state laws and regulations limit the amount of dividends that may be paid by the Bank to the Corporation without regulatory consent. The Bank may not pay any dividends if it is undercapitalized, or if the payment of the dividend would cause it to become undercapitalized. In general, the amount of dividends that may be paid in a calendar year is limited to its “recent earnings” (the current year’s net income combined with the retained net income of the two preceding years), or its “undivided profits” (generally, accumulated net profits that have not been paid out as dividends or transferred to surplus), whichever is less. The ability of the Bank to pay dividends to the Corporation may also be affected by the capital adequacy standards applicable to the Bank (discussed further below), which include minimum requirements and buffers.

CAPITAL PLANNING AND STRESS TESTING

The Corporation’s capital distributions are subject to the Federal Reserve Board’s capital plan rules, which require the Corporation to submit annual capital plans to the Federal Reserve Board for review.

The major components of that oversight are the Federal Reserve Board’s Comprehensive Capital Analysis and Review (CCAR) and Dodd-Frank Act Stress Tests (DFAST). These requirements involve both company-run and supervisory-run

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testing of capital under various scenarios, including baseline and severely adverse scenarios provided by the appropriate banking regulator.

Under the DFAST regulations, the Corporation is required to undergo regulatory stress tests conducted by the Federal Reserve Board annually. The Bank also is required to conduct its own annual internal stress test (although it is permitted to combine certain reporting and disclosure of its stress test results with the results of the Corporation). Results from the Corporation’s and the Bank’s annual company-run stress tests are reported to the appropriate regulators and made publicly available. Northern Trust published the results of its most recent company-run stress tests on June 28, 2023.

CAPITAL ADEQUACY REQUIREMENTS

The Corporation, as a bank holding company, is subject to risk-based and leverage capital guidelines implemented by the Federal Reserve Board that are based on industry-standard guidelines published by the International Basel Committee on Banking Supervision (Basel Committee), known as Basel III. The Bank, as an FDIC-insured depository institution, is also required to meet risk-based and leverage capital guidelines established by regulators which are generally similar to those established by the Federal Reserve Board for bank holding companies.

Under the Basel III rules, the Corporation, with the Bank, is a “core” banking organization that is required to use the advanced approaches methodologies to calculate and disclose publicly its risk-based capital ratios. The Corporation also is subject to a capital floor that is based on the Basel III standardized approach to calculating risk-based capital ratios. The Corporation is therefore required to calculate its risk-based capital ratios under both the standardized and advanced approaches, and is subject to the more stringent of the two in the assessment of its capital adequacy.

In July 2023, the U.S. banking agencies issued a proposed rule to implement the Basel III endgame agreement for large banks (Basel III Endgame Proposal). The proposal would introduce a new measure of RWAs known as “Expanded Total RWAs” (the expanded risk-based approach), reflecting new RWA methodologies that generally align with changes to the global Basel Accord adopted by the Basel Committee. The proposal would eliminate the current Basel III rule’s advanced approaches methodologies and effectively replace it with the expanded risk-based approach, which more heavily relies on standardized methodologies. As compared with the standardized approach, the expanded risk-based approach includes more granular risk weights for credit risk and introduces a new market risk framework. In addition, unlike the standardized approach, the expanded risk-based approach includes operational risk and credit valuation adjustment RWA components.

The Basel III Endgame Proposal, if adopted as a final rule, would maintain the current Basel III rule’s dual-requirement structure, whereby the Corporation and the Bank would be required to calculate risk-based capital ratios under both the expanded risk-based approach and the standardized approach. In addition, the proposal would modify the standardized approach by requiring that the new market risk standards from the proposal also be applied in the standardized approach.

The Basel III Endgame Proposal would apply the stress capital buffer to risk-based capital requirements calculated under both the expanded risk-based approach and the standardized approach. The proposal includes a proposed effective date of July 1, 2025, with three-year transition arrangements until revised standards are fully phased in on July 1, 2028.

Based on our current understanding of the proposed rule, we estimate that, if the expanded risk-based approach had applied on a fully phased-in basis as of December 31, 2023, and in the absence of taking any actions to mitigate its impact, our expanded risk-based approach RWAs as of that date would have been approximately 5% to 15% higher than our actual standardized approach RWAs as of that date. The proposed rule would phase in the higher expanded risk-based approach RWAs on July 1 of each year during the transition, thereby increasing our regulatory capital requirements, with delayed incorporation of the potentially lower stress capital buffer calculations.

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The Bank’s risk-based and leverage capital ratios at December 31, 2023, were well above the regulatory requirements established by U.S. banking regulators. The risk-based and leverage capital ratios for the Corporation and the Bank, together with the regulatory minimum ratios and the ratios required for classification as “well-capitalized,” are provided in the following chart.

TABLE 1: RISK-BASED AND LEVERAGE CAPITAL RATIOS AS OF DECEMBER 31, 2023

	COMMON EQUITY TIER 1 CAPITAL				TIER 1 CAPITAL				TOTAL CAPITAL				TIER 1 LEVERAGE				SUPPLEMENTARY LEVERAGE
	STANDARDIZED APPROACH		ADVANCED APPROACH		STANDARDIZED APPROACH		ADVANCED APPROACH		STANDARDIZED APPROACH		ADVANCED APPROACH		STANDARDIZED APPROACH		ADVANCED APPROACH		ADVANCED APPROACH
Northern Trust Corporation	11.4	%	13.4	%	12.3	%	14.5	%	14.2	%	16.5	%	8.1	%	8.1	%	8.6	%
The Northern Trust Company	12.2	%	14.6	%	12.2	%	14.6	%	13.8	%	16.3	%	8.0	%	8.0	%	8.5	%
Minimum required ratio	4.5	%	4.5	%	6.0	%	6.0	%	8.0	%	8.0	%	4.0	%	4.0	%	3.0	%
“Well-capitalized” minimum ratios, as applicable
Northern Trust Corporation	N/A		N/A		6.0	%	6.0	%	10.0	%	10.0	%	N/A		N/A		N/A
The Northern Trust Company	6.5	%	6.5	%	8.0	%	8.0	%	10.0	%	10.0	%	5.0	%	5.0	%	3.0	%

Advanced approaches institutions, such as the Corporation and the Bank, are subject to a minimum supplementary leverage ratio of 3.0%. Advanced approaches institutions that are insured depository institutions, such as the Bank, also must maintain at least a 3.0% supplementary leverage ratio to be considered “well-capitalized.” The Corporation is also subject to a stress capital buffer, which integrates forward-looking stress test results with non-stress capital requirements, and the Bank is also subject to a capital conservation buffer, which respectively requires the Corporation and the Bank to hold a buffer of Common Equity Tier 1 capital above the minimum risk-based capital requirements in order to avoid constraints on dividends, equity repurchases and compensation. The minimum capital buffer requirement for advanced approaches banking organizations, such as the Corporation and the Bank, is 2.5%.

A “countercyclical buffer” of 0% to 2.5% of a banking organization’s total RWA for advanced approaches banking organizations, such as the Corporation, is also a component of the capital adequacy framework. In general, the amount of the countercyclical capital buffer is a weighted average of the countercyclical capital buffer established in the various jurisdictions in which the banking organization has credit exposures. The U.S. countercyclical buffer is currently set at 0%.

The results of the 2023 DFAST, published by the Federal Reserve Board on June 28, 2023, resulted in Northern Trust’s stress capital buffer and effective Common Equity Tier 1 capital ratio minimum requirement remaining constant at 2.5% and 7.0%, respectively, for the 2023 capital plan cycle, which began on October 1, 2023.

LIQUIDITY STANDARDS

Northern Trust is subject to the U.S. liquidity coverage ratio (LCR) requirement, which is designed to ensure that covered banking organizations, including the Corporation and the Bank, maintain an adequate level of unencumbered high-quality liquid assets equal to their expected net cash outflow for a 30-day time horizon under a prescribed regulatory liquidity stress scenario. As of December 31, 2023, the Corporation and the Bank were in compliance with applicable LCR requirements.

Northern Trust also is subject to the U.S. net stable funding ratio (NSFR) requirement, designed to promote more medium- and long-term funding of the assets and activities of banking entities over a one-year time horizon. As of December 31, 2023, the Corporation and the Bank were in compliance with applicable NSFR requirements. In addition, in 2023, Northern Trust began publicly disclosing certain qualitative and quantitative information about its NSFR consistent with the semi-annual disclosure requirements of the Federal Reserve Board’s final rule on U.S. NSFR disclosure.

As noted above, the enhanced prudential standards impose additional liquidity requirements for large bank holding companies. The Corporation, a Category II institution under the final tailoring rule, is subject to the liquidity risk management, monthly liquidity stress testing, liquidity buffer, and daily liquidity reporting requirements.

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PROMPT CORRECTIVE ACTION

Federal banking regulators are required to take “prompt corrective action” with respect to a depository institution if that institution does not meet certain capital adequacy standards, and are also authorized to take appropriate action against a parent bank holding company of an under-capitalized banking subsidiary. In certain instances, the Corporation could be required to guarantee the performance of a capital restoration plan for the Bank if it were under-capitalized.

RESTRICTIONS ON TRANSACTIONS WITH AFFILIATES

The Bank is subject to restrictions governing transactions between it and affiliated entities, including the Corporation, its affiliates, and its subsidiaries. These transactions must be on terms and conditions that are, or in good faith would be, offered to nonaffiliated companies (i.e., on terms not less favorable to the Bank than market terms). Further, extensions of credit must be secured fully with qualifying collateral and are limited to 10% of the Bank’s capital and surplus for transactions with a single affiliate and to 20% of the Bank’s capital and surplus for transactions with all affiliates.

SWAPS AND OTHER DERIVATIVES.

Northern Trust is subject to comprehensive regulation of its derivatives businesses, including regulations that impose margin requirements, business conduct requirements, trade reporting, central clearing and mandatory trading on regulated exchanges or execution facilities for certain types of swaps and security-based swaps. CFTC and U.S. Securities and Exchange Commission (SEC) rules require registration of swap dealers and security-based swap dealers, respectively, and impose numerous obligations on such registrants, including adherence to business conduct standards for all in-scope instruments. The Bank is registered with the CFTC as a swap dealer and is subject to CFTC and NFA rules and supervision related to its swaps business. Swap dealers regulated by a prudential regulator, like the Bank, are subject to uncleared swap margin requirements and minimum capital requirements established by the prudential regulators. The Corporation has not registered and does not expect that it, or any of its affiliates, will be required to register as a security-based swap dealer with the SEC.

In addition, certain nonbanking affiliates, including Northern Trust Securities, Inc. and Northern Trust Investments, Inc., are registered with the CFTC as commodity trading advisors and/or commodity pool operators, or are operating under certain exemptions from such registration pursuant to CFTC rules and other guidance, and commodity pool operators have certain responsibilities with respect to each pool they operate or advise.

BROKER-DEALER AND INVESTMENT ADVISER REGULATION

Northern Trust Securities, Inc. is registered as a broker-dealer with the SEC and is a member of various self-regulatory organizations, including the Financial Industry Regulatory Authority, Inc. (FINRA). Broker-dealers are subject to laws and regulations relating to all aspects of their securities business operations, including, but not limited to, sales and trading practices, securities offerings, handling of customer funds, net capital levels, recordkeeping, privacy requirements, and the conduct of directors, officers, and employees. Broker-dealers are also regulated by securities administrators in those states where they do business. Northern Trust Securities, Inc. is also registered with the Municipal Securities Rulemaking Board (MSRB) as a municipal securities dealer and subject to regulation as such.

Northern Trust Securities, Inc. and other subsidiaries of the Corporation are registered with the SEC as investment advisers and are subject to regulation by the SEC. The Corporation’s registered investment advisers in the United States are subject to the Investment Advisers Act of 1940, as amended (the Investment Advisers Act), and SEC rules and regulations thereunder, including with respect to record-keeping, operational and marketing requirements, disclosure obligations, fiduciary and other obligations and prohibitions on fraudulent activities, and other applicable state and federal laws and regulations, including anti-fraud laws. The SEC is authorized to institute proceedings and impose sanctions for violations of the Investment Advisers Act, ranging from fines and censure to termination of an investment adviser’s registration. Noncompliance with the Investment Advisers Act or other federal and state securities laws and regulations could result in investigations, sanctions, disgorgement, termination of an investment adviser’s registration, fines and/or reputational harm.

ANTI-MONEY LAUNDERING, ANTI-TERRORISM LEGISLATION, AND OFFICE OF FOREIGN ASSETS CONTROL

Certain subsidiaries of the Corporation are subject to the Bank Secrecy Act of 1970, as amended by the USA PATRIOT Act of 2001 and implemented in the regulation of the federal banking regulators and the Financial Crimes Enforcement Network (FinCEN), which requires banks to comply with anti-money laundering (AML) and financial transparency requirements, such as conducting due diligence, verifying client and beneficial owner identification, and monitoring client transactions and detecting and reporting suspicious activities. AML laws outside the United States contain similar requirements.

In September 2022, FinCEN issued a final rule implementing one of three rulemakings planned in connection with the Corporate Transparency Act, which imposes new beneficial ownership information reporting requirements (Beneficial Ownership Reporting Rule). In order to comply with the Beneficial Ownership Reporting Rule, both domestic reporting companies and foreign reporting companies registered to do business in the United States generally will be required to

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report information regarding themselves, their beneficial owners, and their company applicants. The Beneficial Ownership Reporting Rule became effective January 1, 2024 and may affect certain companies that the Corporation invests in, manages, or does business with. Additionally, on December 16, 2022, FinCEN published a Notice of Proposed Rulemaking for its second set of rulemakings in connection with the Corporate Transparency Act, which addresses how authorized recipients can access beneficial ownership information that will be reported to FinCEN and may affect certain activities conducted by the Bank. FinCEN issued the final rule on December 21, 2023, and it became effective on February 20, 2024.

The U.S. Department of the Treasury’s Office of Foreign Assets Control (OFAC) administers and enforces U.S. economic sanctions laws and regulations, which prohibit the Corporation and its subsidiaries from engaging in business in or with certain jurisdictions and parties that are the target of U.S. economic sanctions, such as organizations and countries suspected of aiding, harboring or engaging in terrorist acts or undermining the sovereignty and territorial integrity of democratic countries. If the Corporation or the Bank finds a sanctioned name or jurisdiction on any transaction, asset or account, the Corporation or the Bank must reject or block such account or transaction and notify the appropriate authorities.

Failure to comply with these requirements could result in fines, penalties, lawsuits, regulatory sanctions or difficulties in obtaining approvals, restrictions on their business activities or harm to reputation. Many other countries have imposed similar laws and regulations that apply to the Corporation’s non-U.S. offices. The Corporation has established policies and procedures to comply with these laws and the related regulations.

DEPOSIT INSURANCE AND ASSESSMENTS

The Bank accepts deposits and eligible deposits have the benefit of FDIC insurance up to the standard maximum deposit insurance amount, which is currently $250,000 for each ownership right and capacity under which the eligible deposit accounts are maintained. Under the Federal Deposit Insurance Act (FDIA), insurance of deposits may be terminated by the FDIC upon a finding that the insured depository institution has engaged in unsafe and unsound practices, is in an unsafe or unsound condition, or has violated laws, regulations, or orders from a regulatory agency.

The FDIC’s Deposit Insurance Fund (DIF) is funded by assessments on FDIC-insured depository institutions. The FDIC assesses premiums based on an assessment rate and an assessment base. An insured depository institution’s assessment base considers average consolidated total assets, less the average tangible equity of the insured depository institution during the assessment period. The assessment base of custody banks is adjusted to exclude certain liquid assets from total average assets. To qualify as a custody bank, certain institutional eligibility criteria must be met. The Bank qualifies as a custody bank for this purpose. The FDIC utilizes a risk-based system to determine each institution’s assessment rate. The assessment rate schedule can change from time to time at the discretion of the FDIC, subject to certain limits.

The FDIC, as required under the FDIA, established a plan in September 2020 to restore the DIF reserve ratio to meet or exceed the statutory minimum of 1.35% within eight years. Based on the FDIC’s recent projections, the FDIC determined that the DIF reserve ratio is at risk of not reaching the statutory minimum by the statutory deadline of September 30, 2028 without increasing the deposit insurance assessment rates. In 2022, the FDIC adopted a final rule, applicable to insured depository institutions, to increase initial base deposit insurance assessment rate schedules uniformly by 2 basis points, beginning on January 1, 2023. The FDIC also concurrently maintained the long-term target reserve ratio for the DIF, referred to as the Designated Reserve Ratio, at 2% for 2023. The increase in assessment rate schedules is intended to increase the likelihood that the reserve ratio of the DIF reaches the statutory minimum of 1.35% by the statutory deadline of September 30, 2028.

In November 2023, the FDIC issued a final rule to implement a special assessment to recoup losses to the DIF associated with bank failures in the first half of 2023. Under the final rule, the assessment base for the special assessment is equal to an insured depository institution’s estimated uninsured domestic office deposits reported as of December 31, 2022, adjusted to exclude the first $5 billion of uninsured domestic office deposits. The final rule provides that the FDIC will collect the special assessment at a quarterly rate of 3.36 basis points over eight quarterly assessment periods, subject to change depending on any adjustments to the loss estimate, mergers, failures, or amendments to reported estimates of uninsured deposits. In conjunction with the special assessment, $84.6 million was recognized as an accrued liability and related expense in the fourth quarter of 2023. The final rule becomes effective on April 1, 2024, and the first collection, including any adjustments as described above, will be reflected on the invoice for the first quarterly assessment period of 2024, with the first payment due on June 28, 2024. For more information on the FDIC’s special assessment, please see the “Consolidated Results of Operations—Noninterest Expense” included in Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

COMMUNITY REINVESTMENT ACT

The Bank is subject to the CRA. The CRA and the regulations issued thereunder are intended to encourage banks to help meet the credit needs of their service areas, including low- and moderate-income neighborhoods and persons, consistent with the safe and sound operations of the banks. For purposes of the CRA, the Bank operates under a “wholesale” designation granted by the Federal Reserve Board and fulfills its CRA obligations by making qualified

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investments for the purposes of community development. The Bank received an “outstanding” CRA rating from the Federal Reserve Board in its most recent CRA examination.

In October 2023, the U.S. banking agencies issued a final rule to amend their regulations implementing the CRA. The rule materially revises the current CRA framework, mostly for retail designated banks, including the assessment areas in which a bank is evaluated to include activities associated with online and mobile banking, the tests used to evaluate a bank in its assessment areas, new methods of calculating credit for lending, investment and service activities, and additional data collection and reporting requirements. The rule is expected to result in a significant increase in the thresholds for large banks to receive “outstanding” ratings in the future.

According to the new rule, banks currently designated as “wholesale” will be absorbed into the “limited purpose” designation. The rule outlines that a limited purpose bank is one that is not in the business of extending consumer or retail loans, except on an incidental and accommodation basis. Limited purpose banks are only subject to a qualitative and quantitative review of a bank’s community development lending and investments in each assessment area. While we will continue to be evaluated on our community development activities in our local markets, we will also be evaluated against a national benchmark based on assets.

The rule is expected to take effect on April 1, 2024, with most of its provisions becoming applicable on January 1, 2026. Reporting of the collected data will not be required until 2027.

DATA PRIVACY AND SECURITY

Federal law establishes a minimum federal standard of financial privacy by, among other provisions, requiring financial institutions to adopt, disclose, and enforce privacy policies with respect to consumer information, setting limitations on disclosure to third parties of consumer information, setting standards for protecting client information and preventing unlawful access to such information, and requiring notice of data breaches in certain circumstances. For example, the Federal Trade Commission has the authority to regulate and enforce against unfair or deceptive acts or practices in or affecting commerce, including acts and practices with respect to data privacy and security, and the Gramm-Leach-Bliley Act regulates the confidentiality and security of customer information obtained by financial institutions and certain other types of financial services businesses.

Most U.S. states, the EU and other non-U.S. jurisdictions also have adopted their own statutes and/or regulations concerning data privacy and security and requiring notification of data breaches―for example, the General Data Protection Regulation (GDPR) in Europe and its equivalent in the UK (UK GDPR), the Personal Information Protection Law (PIPL) in China, and the California Consumer Privacy Act, as amended by the California Privacy Rights Act (collectively, CCPA) in the United States. Similar laws are in effect or being considered in other jurisdictions in which we operate across the globe. The GDPR is designed to harmonize data privacy and security laws across the European Economic Area (EEA), to protect EEA citizens’ data privacy and security. The GDPR imposes stringent operational requirements on both data controllers and data processors and has extraterritorial effect as its scope includes all data controllers and processors outside the EEA whose processing activities relate to the offering of goods or services to, or monitoring the behavior of, EEA individuals. Organizations that violate certain provisions of the GDPR could be fined up to €20 million or 4% of their annual worldwide revenue for the preceding fiscal year, whichever is greater. The GDPR also has been implemented into UK law as part of the arrangements following the UK’s withdrawal from the EU and operates in conjunction with other local data privacy requirements, although the GDPR and UK GDPR may diverge over time. The UK is also in the process of reforming its data privacy rules through a new Data Protection and Digital Information Bill.

In the United States, the CCPA broadly defines personal information and substantially increases the rights of California residents to understand how their personal information is collected, used, and otherwise processed by commercial businesses, such as affording them the right to access and request deletion of their information and to opt out of certain sharing and sales of personal information. The CCPA includes a private right of action (permitting lawsuits to be brought by private individuals instead of the state Attorney General or other government actor for certain breaches), and contemplates civil penalties of up to $2,500 for each violation and up to $7,500 for each intentional violation.

In addition, several states have enacted comprehensive data privacy laws similar to the CCPA. These will apply in addition to laws that already exist in all 50 U.S. states that require businesses to provide notice under certain circumstances to consumers whose personal information has been disclosed as a result of a data breach. Moreover, the U.S. Congress has recently considered, and is currently considering, various proposals for more comprehensive data privacy and security legislation, to which we may be subject if enacted.

The Corporation maintains a regulatory change framework to monitor and respond to regulatory change, including for data privacy, and has adopted and disseminated privacy policies and communicates required information relating to financial privacy and data security in accordance with applicable law.

CONSUMER LAWS AND REGULATIONS

The Corporation’s banking subsidiaries are subject to certain federal and state laws and regulations designed to protect consumers in transactions with banks. Failure to comply with these laws and regulations could lead to substantial penalties,

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operating restrictions and reputational damage to the financial institution. Consumer laws and regulations are enforced by the Consumer Financial Protection Bureau (CFPB) and other federal and state regulators.

NON-U.S. REGULATION

Northern Trust is subject to the laws and regulatory authorities of the jurisdictions in which its non-U.S. branches and subsidiaries operate. For example, branches and subsidiaries conducting banking and asset servicing businesses in the UK are authorized to do so pursuant to the UK Financial Services and Markets Act 2000. They are authorized by the Prudential Regulation Authority (PRA) and/or the Financial Conduct Authority (FCA). The PRA and FCA exercise broad supervisory and disciplinary powers that include the power to revoke temporarily or permanently authorization to conduct a regulated business upon breach of the relevant regulations, impose capital requirements, suspend registered employees, and impose censures and fines on both regulated businesses and their regulated employees. Additionally, the Bank is licensed as a foreign authorized deposit-taking institution in Australia under the Banking Act (Australia) and as a wholesale bank in Singapore under the Banking Act (Singapore) and as a result is subject to the supervision of the Australian Prudential Regulation Authority and the Monetary Authority of Singapore, respectively.

Northern Trust’s European branches and subsidiaries are subject to the laws and regulatory authorities of the EU and the member states in which they are domiciled. For example, Northern Trust Global Services SE, as an EU-domiciled credit institution in Luxembourg, is subject to the prudential supervision of the ECB and the CSSF. Moreover, Northern Trust’s non-EU branches and subsidiaries conducting financial services activities in the EU may fall within the scope of the laws of the EU and, given the increasing extraterritorial effect of EU legislation, non-EU branches and subsidiaries may still fall within the scope of EU law if they transact outside of the EU with EU clients.

Since January 31, 2020, the UK has not been a member of the EU. EU legislation as it applied to the UK on December 31, 2020 is a part of UK domestic legislation, under the control of the UK’s parliament. Most UK law relevant to the Corporation and its subsidiaries is still closely aligned with the EU legislative framework in place in December 2020. However, in 2022, the UK government proposed legislation that makes significant reforms to the UK’s financial services regulations. In particular, the Financial Services and Markets Act 2023 includes measures revoking retained EU law relating to financial services. In addition, the UK government announced a package of post-Brexit reforms to drive growth and competitiveness in the financial services sector. The Financial Services and Markets Act 2023 along with these other reforms may directly and indirectly impact the Corporation.

The following items provide a brief description of certain key regulatory requirements in the EU and the UK relevant to the Corporation and its subsidiaries, in addition to the BRRD and GDPR discussed under “Resolution Planning” and “Data Privacy and Security,” respectively, above.

EU and UK Prudential Regulatory Frameworks. The EU Capital Requirements Directive of June 26, 2013 (CRD) and the EU Capital Requirements Regulation of June 26, 2013 (CRR) set out the framework for prudential regulation of credit institutions in the EU, including, among other things, capital and liquidity requirements, leverage, and disclosure and reporting. CRR and CRD have been subject to extensive amendments relating to the leverage ratio, the net stable funding ratio, large exposures, and market and counterparty credit risk, enhancing the resiliency of EU banks to potential future economic shocks, the transition to climate neutrality and finalizing the implementation of the Basel III agreement. Since June 26, 2021, investment firms under the Markets in Financial Instruments Directive (MIFID) have been subject to a new prudential regime under the EU Investment Firm Directive and Investment Firm Regulation. In April 2021, the Financial Services Act came into force in the UK establishing among other things, (i) a framework for the new investment firm prudential framework to apply in the UK and (ii) the UK implementation of Basel III standards, including amendments to CRR as implemented into UK law following the withdrawal from the EU. UK and EU branches and subsidiaries of the Corporation may also be subject to local rules on outsourcing and operational resilience.

Markets Regulation. MIFID (which came into force in 2018), the linked Markets in Financial Instruments Regulation (MIFIR), and the European Market Infrastructure Regulation 648/2012 (EMIR) are the primary pieces of EU legislation which regulate, among other things, trading in derivative and securities markets, transaction reporting, investor protection, clearing and risk mitigation. MIFID, MIFIR and EMIR, with applicable amendments, now form part of UK law under the legislation implemented when the UK left the EU. Reforms to the onshored version of MIFIR have been made by the UK Financial Services and Markets Act 2023. The reforms impact, among other things, the share trading obligation and derivatives trading obligation.

Central Securities Depositories Regulation. On September 17, 2014, the EU Central Securities Depositories Regulation (CSDR) entered into force (subject to a number of transitional provisions). The CSDR aims principally to ensure that transactions between buyers and sellers of dematerialized securities are settled in a safe and timely manner by introducing common securities settlement standards across the EU. Key features of the CSDR include shorter settlement periods, settlement discipline measures (including mandatory cash penalties and “buy-ins” for settlement fails and settlement fails reporting) and an obligation regarding dematerialization for most securities. In the UK, the Financial

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Services and Markets Act 2023 grants to the Bank of England new rule-making powers in relation to central securities depositories (CSD).

Securities Financing Transactions and Reuse of Collateral Regulation. On November 25, 2015, the EU adopted a regulation on securities financing transactions and reuse of collateral (SFTR) as part of its approach to addressing shadow banking. The regulation includes provisions for enhanced transparency and reporting of securities financing transactions. The SFTR entered into force on January 12, 2016. The reporting obligations under the SFTR were phased in over several periods through January 11, 2021.

Benchmarks Regulation. On January 1, 2018, the EU Benchmarks Regulation (BMR) became applicable in all EU member states. The principal objectives of the BMR are to restore investor confidence in the accuracy, robustness and integrity of indices used as benchmarks in financial instruments and financial contracts or to measure the performance of investment funds, and the benchmark-setting process itself. The BMR aims to achieve these objectives by ensuring that benchmarks are not subject to conflicts of interest, are used appropriately, and reflect the actual market or economic reality they are intended to measure. The BMR has been incorporated into UK law following the withdrawal from the EU, with applicable amendments. In the UK, the FCA has exercised powers under the BMR to effect the publication of a synthetic LIBOR rate for one-month, three-month and six-month sterling and U.S. Dollar LIBOR (USD LIBOR) beyond their respective dates of cessation.

Sustainable Finance Disclosure Regulations. On December 29, 2019, the EU Sustainable Finance Disclosure Regulations (SFDR) entered into force. SFDR aims to prevent “greenwashing” (conveying a misleading or false impression a product is more environmentally favorable than it actually is) by requiring disclosure of how sustainability risks and environmental, social and governance (ESG) factors are part of the investment and business processes of asset managers. Mandatory disclosures are required to be published at product and manager levels in a variety of ways, including on websites, in pre-contractual documents (e.g., prospectuses) and in annual reports. In October 2021, the UK government announced that it will launch its own consultation with stakeholders on sustainable finance disclosures rules for certain UK market participants and certain investment products. On October 25, 2022, the FCA issued a consultation paper on new measures for a UK regime on sustainability disclosure requirements and investment labels. The new measures will enter into force during the course of 2024.

Taxonomy Regulation. On July 12, 2020, Regulation (EU) 2020/852 (Taxonomy Regulations) entered into force. The Taxonomy Regulations are part of the EU’s recent measures designed to encourage environmentally sustainable investment decision making and introduce a technical framework to ascertain how sustainable an economic activity is. The Taxonomy Regulations apply to financial market participants including MiFID firms, Undertakings for the Collective Investment in Transferable Securities (UCITS) management companies, and alternative investment fund managers, and will require them to make further entity, pre-contractual and periodic disclosures. The UK government is in the process of implementing its own “green” taxonomy for guiding companies and investors on “green” investments, similar to the EU regime.

Deposit Guarantee Scheme. Eligible deposits held with EU credit institutions and certain other financial entities are subject to the recast Deposit Guarantee Schemes Directive (DGSD) implemented in 2014. It required EU member states to introduce legislation establishing at least one deposit guarantee scheme (DGS). A DGS which is established and recognized in one member state is obliged to cover the depositors (up to certain prescribed amounts) at branches of the same institution in other EU member states. In the UK, the Financial Services Compensation Scheme is the national DGS for the protection and reimbursement of depositors of failed financial institutions.

Fifth EU Money Laundering Directive. On July 9, 2018, the Fifth EU Money Laundering Directive (MLD5) entered into force. MLD5 was required to be transposed into local law by EU member states by January 10, 2020 and introduced the following key changes to the previous EU AML regime: (i) EU member states must ensure that registers of ultimate beneficial owners of companies and other legal entities are accessible to the general public; (ii) the previous AML regime was extended to additional service providers, such as electronic wallet providers, virtual currency exchange service providers, and art dealers, and further specifications regarding the scope of application of MLD5 with respect to tax advisors and estate agents were provided; (iii) the threshold for identifying holders of prepaid cards was lowered to €150; and (iv) EU member states were required to implement enhanced due diligence measures to monitor suspicious transactions involving high-risk countries more strictly. The UK government transposed MLD5 into UK law and, therefore, the UK anti-money laundering regime is currently broadly aligned with the EU. On December 7, 2022, the Council of the EU agreed its position on AML regulation through the Sixth EU Money Laundering Directive. The new rules will extend to, among other items, the entire crypto-asset sector, third-party intermediaries, persons trading in precious metals, precious stones and cultural goods.

Shareholder Rights Directive. On May 17, 2017, the recast Shareholder Rights Directive (EU) 2017/828 was published (SRD II). Member states of the EU were required to bring into force the laws, regulations and administrative provisions necessary to comply with the Directive by June 10, 2019. SRD was designed to establish requirements in relation to the exercise of shareholder rights and, recognizing that shares are often held through complex chains of intermediaries, SRD II is designed to improve mechanisms for the identification of shareholders by companies, as well as

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improve the transmission of information along the chain of intermediaries to facilitate the exercise of shareholder rights. Non-EU intermediaries are required to comply with the requirements if they provide services with respect to shares of companies that have their registered office in the EU. SRD II has been incorporated into UK law and remains largely aligned with the EU.

Depositary Books & Records. Following the European Securities and Markets Authority’s opinion on asset segregation and application of depositary delegation rules to CSDs published on July 20, 2017, changes were introduced by two EU regulations modifying the existing Alternative Investment Fund Managers Directive (AIFMD) and UCITS Level 2 Regulations. The changes aim to better define asset segregation requirements and to add additional safeguards, primarily focusing on information flow between the depositary and any third party to whom safe-keeping functions have been delegated. The key changes (i) impact the frequency of reconciliations between the depositary’s internal accounts and records and those of any third party in the custody chain, (ii) require the depositary to maintain an independent record separate from the record maintained by the third party, and (iii) increase due diligence obligations where custody of assets is delegated to third parties outside of the EU. AIFMD and the UCITS directive were incorporated into UK law and remain largely aligned with the EU. The changes impact Northern Trust’s subsidiaries providing depositary services to European-domiciled fund clients.

In addition to the above, the Bank’s and the Corporation’s subsidiary banks located outside the United States are subject to regulatory capital requirements in the jurisdictions in which they operate. As of December 31, 2023, each of our non-U.S. banking subsidiaries had capital ratios above their specified minimum requirements.

Human Capital Management

The success of our company relies heavily on the strength of the people we employ. Attracting, engaging, developing and retaining Northern Trust talent is critical. We invest in our employees holistically to continually build a diverse pipeline of future leaders and enable internal professional advancement. The overview below outlines Northern Trust’s human capital objectives—talent management, total rewards, and diversity, equity and inclusion.

EMPLOYEES

Northern Trust employed approximately 23,100 full-time equivalent employees as of December 31, 2023. The regional breakout of our employee base is 42% Asia-Pacific, 41% North America, and 17% Europe, Middle East, and Africa.

TALENT MANAGEMENT

We pride ourselves in attracting strong talent and have identified the development of our talent as a strategic priority. Our focus on well-being, diversity, and a culture of trust, care and collaboration contribute to our employer brand.

Sourcing and Recruitment. We target our talent identification, sourcing methods, and recruitment strategies to specific locations using various channels such as job boards, colleges, professional networks, associations and online social networks. We base hiring decisions on a variety of factors including relevant experience and accomplishments, educational background, professional licensing, and strong evidence of integrity and ethical behavior.

Onboarding. Northern Trust is committed to helping all new hires succeed from day one. New employees begin their onboarding journey with a comprehensive learning roadmap that orients them to our history, brand, businesses, and culture. Orientation programs also augment the onboarding experience by providing global, regional, and/or local information along with networking activities to help connect new hires to each other and other colleagues.

Learning and Development. An integrated partnership between our enterprise-wide and functional learning and development teams ensures we deliver holistic training solutions. Through our online learning portal, Northern Trust University, all employees can access a portfolio of professional and functional training offerings most helpful to their role. We provide targeted development opportunities for employees transitioning into management and throughout their management and leadership career. Our training content is dynamic as we regularly evaluate its quality and utilization and we refresh and organize courses and resources to enable employees to develop skills most critical to servicing our clients and developing their careers. A continuing area of focus is helping expand digital, analytical and financial acumen and skills across the enterprise. Many of our programs are interactive, include peer networking, and offer direct access to expert facilitators. Training is offered through online libraries of self-study content and in both virtual and classroom instructor-led formats.

Talent Planning and Organizational Effectiveness. Northern Trust is committed to identifying and developing talent with the breadth, depth, and diversity of technical and leadership skills to execute business strategies today and in the future. Managers conduct talent assessments for employees annually and business and regional leadership teams hold regular talent review discussions focused on specific topics, such as workforce needs, retention risks, diversity, top talent, readiness for promotion, readiness-to-move, and succession plans. Senior level talent reviews are also conducted each year by our senior management and Board of Directors, led by our Chairman and Chief Executive Officer and Chief Human Resources Officer.

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Performance Management. Northern Trust’s annual performance management process includes goal setting, mid-year check-ins, multi-rater feedback, and year-end reviews. Strategic corporate priorities are set by our Chairman and Chief Executive Officer and are applied to each business, department, team and individual. Managers are encouraged to provide regular feedback and real-time coaching to drive performance outcomes and facilitate development.

Engagement and Recognition. Building an inclusive, connected and engaged employee culture is essential to retaining our talent. We collect employee perspectives and ideas through an annual Engagement Survey. Results are evaluated to identify strengths, progress, and opportunities to strengthen employee engagement, and are shared with employees and the Board of Directors. We also offer an online employee recognition platform that strengthens the unity that binds us as a company and connects employees in new and meaningful ways.

TOTAL REWARDS

Our compensation and benefit programs are designed to be market-competitive and enable us to attract and retain talent to deliver on Northern Trust’s strategy.

Compensation Programs. Our compensation programs are intended to motivate our employees to deliver the highest-quality service to our clients and achieve the greatest collective business results while appropriately managing risk. They are designed, implemented, and communicated to promote behaviors that are consistent with Northern Trust’s desired culture, character and enduring values of service, expertise, and integrity. We also regularly review our compensation processes and programs and take appropriate measures to ensure we can attract and retain talent in relevant markets.

Northern Trust’s base salary programs provide a competitive level of fixed pay reflecting each employee’s position, experience, qualifications and tenure. Additionally, all employees are eligible for incentive compensation to reward performance that delivers strong team or individual results. Incentive compensation is linked to both financial and non-financial performance criteria, including risk considerations, as determined by our Board of Directors and senior management. Select senior leaders and individual contributors may receive a percentage of their incentive in Northern Trust stock to encourage retention of key talent and to align rewards with company performance.

Employee Benefits. While the exact composition of the employee benefit package varies by country, our benefit programs are designed to be locally competitive, to meet the needs of our employees and their families, and to reflect the cultural values of the organization. Typical benefit programs include retirement, health care, paid time off, income protection such as disability and life insurance, leaves of absence, and access to our Employee Assistance Program. Our expanded employee well-being programs and resources focus on how to manage stress, build resiliency, and be attuned to mental health issues; accessing flexible or voluntary benefits; and enhancements to various parental leave offerings.

DIVERSITY, EQUITY, AND INCLUSION (DE&I)

Northern Trust is committed to an inclusive culture and strives to create a work environment in which all individuals are welcomed, respected, supported, valued, and can fully contribute to the success of the business.

Leading From the Top. Our vision for creating an inclusive environment is embedded at all levels of the organization. Our Board of Directors, through its Human Capital and Compensation Committee, and our Chairman and Chief Executive Officer actively engage in oversight of our DE&I strategies and initiatives. All DE&I functions are led by our Head of Corporate Sustainability, Inclusion and Social Impact, who is an Executive Vice President, and reports directly to our Chairman and Chief Executive Officer. Reflecting the importance of an inclusive workplace, in 2023, we established the role of Global Chief DE&I Officer, responsible for developing the enterprise’s inclusion strategies. Three Regional DE&I Leads are responsible for the design and execution of topic relevant programs across North America, Europe, the Middle East, and the Asia-Pacific region. Our Global DE&I Executive Council is responsible for providing strategic oversight and driving accountability on the inclusion priorities.

The following table presents the gender and ethnic diversity of our Board of Directors and executive officers.

TABLE 2: BOARD OF DIRECTORS AND EXECUTIVE OFFICERS REPRESENTATION

	DECEMBER 31, 2023
	FEMALE	MALE	WHITE	BLACK	HISPANIC	ASIAN
Board of Directors	25%	75%	59%	25%	8%	8%
Executive Officers	33%	67%	84%	8%	8%	—%

Bolstering Inclusion. We are committed to providing equal opportunities for all employees regardless of race, gender, gender identity, sexual orientation, age, disability, religion, ethnicity, veteran status, or any other characteristic. We strive to ensure that our policies, processes, and structures promote inclusivity and offer equitable opportunities for our employees to grow and thrive within the workplace. We invest in ongoing education to increase awareness and understanding of diversity and inclusion concepts and behaviors.

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Leveraging our employee Engagement Survey and insights and benchmarks from industry experts, we launched our Inclusion Index to better understand the factors that drive inclusion and our employees’ sense of belonging across the organization. The Index helps us identify gaps and opportunities to build upon our strengths around inclusion. Our leaders are committed to implementing solutions to foster an inclusive and diverse workplace that aligns with the Corporation’s mission, values, goals, and business practices.

Available Information

Through the Corporation’s website at www.northerntrust.com, the Corporation makes available free of charge its Annual Report on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, and all other reports and all amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended (Exchange Act), as soon as reasonably practicable after it files such material with, or furnishes such material to, the SEC. The contents of the Corporation’s website, the website of the SEC or any other website referenced herein are not a part of this Annual Report on Form 10-K.

ITEM 1A - RISK FACTORS

In the normal course of our business activities, we are exposed to a variety of risks. The following discussion sets forth the risk factors that we have identified as being most significant to Northern Trust. Although we discuss these risk factors primarily in the context of their potential effects on our business, financial condition or results of operations, you should understand that these effects can have further negative implications such as: reducing the price of our common stock and other securities; reducing our capital, which can have regulatory and other consequences; affecting the confidence that clients, counterparties and/or applicable regulators have in us, with a resulting negative effect on our ability to conduct and grow our businesses; and reducing the attractiveness of our securities to rating agencies and potential purchasers, which may affect adversely our ability to raise capital and secure other funding or the cost at which we are able to do so. Additional risks beyond those discussed below, elsewhere in this Annual Report on Form 10-K or in other of our reports filed with, or furnished to, the SEC also could affect us adversely. Further, we cannot assure you that the risk factors herein or elsewhere in our other reports address all potential risks that we may face and you should not interpret discussion of any risk to imply that such risk has not already materialized.

These risk factors also serve to describe factors which may cause our results to differ materially from those described in forward-looking statements included herein or in other documents or statements that make reference to this Annual Report on Form 10-K. Forward-looking statements and other factors that may affect future results are discussed under “Forward-Looking Statements” included in Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

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Summary

Our business, financial condition or results of operations may be materially and adversely affected by various risk types and considerations, including market risks, operational risks, credit risks, liquidity risks, regulatory and legal risks, strategic risks, and other risks, including as a result of the following:

Market Risks

•We are dependent on fee-based business for a majority of our revenues, which may be affected adversely by market volatility, a downturn in economic conditions, underperformance and/or negative trends in investment preferences.

•Changes in interest rates can affect our earnings negatively.

•Changes in the monetary, trade and other policies of various regulatory authorities, central banks, governments and international agencies may reduce our earnings and affect our growth prospects negatively.

•Macroeconomic conditions and uncertainty in the global economy, including the financial stability of various regions or countries across the globe, including the risk of defaults on sovereign debt and related stresses on financial markets, could have a significant adverse effect on our earnings.

•Declines in the value of securities held in our investment portfolio can affect us negatively.

•Volatility levels and fluctuations in foreign currency exchange rates may affect our earnings.

•Changes in a number of particular market conditions can affect our earnings negatively.

Operational Risks

•Many types of operational risks can affect our earnings negatively.

•We are highly dependent on information technology systems, and networks, many of which are operated by third parties, and any failures of, or disruptions to, our or such third parties’ technological systems or networks could materially and adversely affect our business.

•Breaches of our security measures, including, but not limited to, those resulting from cyber-attacks, or other information security incidents may result in losses.

•Errors, breakdowns in controls or other mistakes in the provision of services to clients or in carrying out transactions for our own account can subject us to liability, result in losses or have a negative effect on our earnings in other ways.

•Our dependence on technology, and the need to update frequently our technology infrastructure, exposes us to risks that also can result in losses.

•A failure or circumvention of our controls and procedures could have a material adverse effect on our business, financial condition and results of operations.

•Failure of any of our third-party vendors (or their vendors) to perform can result in losses.

•We are subject to certain risks inherent in operating globally which may affect our business adversely.

•Failure to control our costs and expenses adequately could affect our earnings negatively.

•Pandemics, natural disasters, global climate change, acts of terrorism, geopolitical tensions, and global conflicts may have a negative impact on our business and operations.

Credit Risks

•Failure to evaluate accurately the prospects for repayment when we extend credit or maintain an adequate allowance for credit losses can result in losses or the need to make additional provisions for credit losses, both of which reduce our earnings.

•Market volatility and/or weak economic conditions can result in losses or the need for additional provisions for credit losses, both of which reduce our earnings.

•The failure or perceived weakness of any of our significant counterparties could expose us to loss.

Liquidity Risks

•If we do not manage our liquidity effectively, our business could suffer.

•If the Bank is unable to supply the Corporation with funds over time, the Corporation could be unable to meet its various obligations.

•We may need to raise additional capital in the future, which may not be available to us or may only be available on unfavorable terms.

•Any downgrades in our credit ratings, or an actual or perceived reduction in our financial strength, could affect our borrowing costs, capital costs and liquidity adversely.

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Regulatory and Legal Risks

•Failure to comply with regulations and/or supervisory expectations can result in penalties and regulatory constraints that restrict our ability to grow or even conduct our business, or that reduce earnings.

•We are subject to extensive and evolving government regulation and supervision that impacts our operations. Changes by the U.S. and other governments to laws, regulations and policies applicable to the financial services industry may heighten the challenges we face and make regulatory compliance more difficult and costly.

•We are subject to complex and evolving laws, regulations, rules, standards and contractual obligations regarding data privacy and security, which could increase the cost of doing business, compliance risks and potential liability.

•We may be impacted adversely by claims or litigation, including claims or litigation relating to our fiduciary responsibilities.

•We may be impacted adversely by supervisory and/or regulatory enforcement matters.

•We may fail to set aside adequate reserves for, or otherwise underestimate our liability relating to, pending and threatened claims, with a negative effect on our earnings.

•The ultimate impact on us of regulatory divergence between the United Kingdom and the European Union remains uncertain.

•If we fail to comply with legal standards, we could incur liability to our clients or lose clients, which could affect our earnings negatively.

Strategic Risks

•If we are not able to attract, retain and motivate personnel, our business could be negatively affected.

•If we do not develop and execute strategic plans successfully, our growth may be impacted negatively.

•We are subject to intense competition in all aspects of our businesses, which could have a negative effect on our ability to maintain satisfactory prices and grow our earnings.

•Damage to our reputation could have a direct and negative effect on our ability to compete, grow and generate revenue.

•We need to invest in innovation constantly, and the inability or failure to do so may affect our businesses and earnings negatively.

•Failure to understand or appreciate fully the risks associated with development or delivery of new product and service offerings may affect our businesses and earnings negatively.

•Our success with large, complex clients requires an understanding of the market and legal, regulatory and accounting standards in various jurisdictions.

•We may take actions to maintain client satisfaction that result in losses or reduced earnings.

•Our operations, businesses and clients could be materially adversely affected by the effects of climate change or concerns related thereto.

Other Risks

•The systems and models we employ to analyze, monitor and mitigate risks, as well as for other business purposes, are inherently limited, may not be effective in all cases and, in any case, cannot eliminate all risks that we face.

•Changes in tax laws and interpretations and challenges to our tax positions may affect our earnings negatively.

•Changes in accounting standards may be difficult to predict and could have a material impact on our consolidated financial statements.

•Our ability to return capital to stockholders is subject to the discretion of our Board of Directors and may be limited by U.S. banking laws and regulations, applicable provisions of Delaware law, or our failure to pay full and timely dividends on our preferred stock and the terms of our outstanding debt.

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Market Risks

We are dependent on fee-based business for a majority of our revenues, which may be affected adversely by market volatility, a downturn in economic conditions, underperformance and/or negative trends in investment preferences.

Our principal operational focus is on fee-based business, which is distinct from commercial banking institutions that earn most of their revenues from loans and other traditional interest-generating products and services. Fees for many of our products and services are based on the market value of assets under management, custody or administration; the volume of transactions processed; securities lending volume and spreads; fees for other services rendered; and in certain businesses, fees calculated as a percentage of our clients’ earnings, all of which may be impacted negatively by market volatility, a downturn in economic conditions, underperformance and/or negative trends in investment preferences. For example, downturns in equity markets and decreases in the value of debt-related investments resulting from market disruption, illiquidity or other factors historically have reduced the valuations of the assets we manage or service for others, which generally impacted our earnings negatively. Further, although we do not hold, invest in, or custody cryptocurrency assets, the markets in which they trade are highly volatile and volatility in these markets may impact the markets for other assets that we hold, invest in, or custody, which could also impact our fees or financial condition. Market volatility and/or weak economic conditions also may affect wealth creation, investment preferences, trading activities, and savings patterns, which impact demand for certain products and services that we provide.

Our earnings also may be affected by poor investment returns or changes in investment preferences driven by factors beyond market volatility or weak economic conditions. Poor absolute or relative investment performance in funds or client accounts that we manage or in investment products that we design or provide may result in declines in the market values of portfolios that we manage and/or administer and may affect our ability to retain existing assets and to attract new clients or additional assets from existing clients. For example, from time to time in the past, outflows from certain of our products driven by relative investment performance or other factors adversely impacted our overall fees derived from assets that we manage. Broader changes in investment preferences that lead to less investment in mutual funds or other collective funds, such as the shift in investor preference to lower fee products, could also impact our earnings negatively.

Changes in interest rates can affect our earnings negatively.

The direction and level of interest rates are important factors in our earnings. Interest rate changes could affect the interest earned on assets differently than interest paid on liabilities. In response to rising inflation, the Federal Reserve Board increased interest rates from historically low levels during 2022 and 2023. While a rising interest rate environment generally has a positive effect on our net interest margin, in some circumstances, a rise in interest rates also may affect us negatively. For example, the rapid increases in interest rates during 2022 and 2023 adversely impacted the value of certain of our investment securities, with resultant impacts on our capital, liquidity, and earnings. Additionally, higher interest rates historically have caused, and may in the future cause: market volatility and downturns in equity markets, resulting in a decrease in the valuations of the assets we manage or service for others, which generally impact our earnings negatively; our clients to transfer funds into investments with higher rates of return, resulting in decreased deposit levels and higher fund or account redemptions; our borrowers to experience difficulties in making higher interest payments, resulting in increased credit costs, provisions for loan and lease losses and charge-offs; reduced bond and fixed income fund liquidity, resulting in lower performance, yields and fees; or higher funding costs.

Conversely, low-interest-rate environments generally result in a compressed net interest margin and also have a negative impact on our fees earned on certain of our products. For example, in the past we waived certain fees associated with money market funds due to the low level of short-term interest rates. Low net interest margins and fee waivers each negatively impact our earnings.

Although we have policies and procedures in place to assess and mitigate potential impacts of interest rate risks, if our assumptions about any number of variables are incorrect, these policies and procedures to mitigate risk may be ineffective, which could impact earnings negatively.

Please see “Market Risk” in the “Risk Management” section included in Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” for a more detailed discussion of interest rate and market risks we face.

Changes in the monetary, trade and other policies of various regulatory authorities, central banks, governments and international agencies may reduce our earnings and affect our growth prospects negatively.

The monetary, trade and other policies of U.S. and international governments, agencies and regulatory bodies have a significant impact on economic conditions and overall financial market performance. For example, the Federal Reserve Board regulates the supply of money and credit in the U.S. through quantitative tightening and/or easing, and its policies determine in large part the level of interest rates and our cost of funds for lending and investing, and play a role in contributing to or moderating levels of inflation, all of which meaningfully impact our earnings. Further, their policies can affect our borrowers by increasing interest rates or making sources of funding less available, which may increase the risk that borrowers fail to repay their loans from us. Changes in monetary, trade and other governmental policies are beyond our

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control and can be difficult to predict, and we cannot determine the ultimate effect that any such changes would have upon our business, financial condition or results of operations.

Macroeconomic conditions and uncertainty in the global economy, including the financial stability of various regions or countries across the globe, including the risk of defaults on sovereign debt and related stresses on financial markets, could have a significant adverse effect on our earnings.

Risks and concerns about the financial stability of various regions or countries across the globe could have a detrimental impact on economic and market conditions in these or other markets across the world. Foreign market and economic disruptions have affected, and may in the future affect, consumer confidence levels and spending, international trade policy, personal bankruptcy rates, levels of incurrence of and default on consumer debt, and home prices. Additionally, financial markets may be adversely affected by the liquidity or capital deficiencies (actual or perceived) of financial institutions and related industry and government actions, current or anticipated impact of military conflict (including the continuing military conflicts involving Ukraine and the Russian Federation and Israel and Hamas and other evolving events in the Middle East), terrorism, political or civil unrest, public health epidemics or pandemics, the exit or potential exit of one or more countries from the EU, sovereign debt downgrades or debt crises, or other geopolitical events. For example, developments related to the U.S. federal debt ceiling, including the possibility of a government shutdown, default by the U.S. government on its debt obligations, or related credit-rating downgrades, could have adverse effects on the broader economy, disrupt access to capital markets, and contribute to, or worsen, an economic recession. The cumulative effect of uncertain business conditions or economic challenges faced in various foreign markets, including fiscal or monetary concerns, economic downturns and the possibility of a recession in some jurisdictions, other economic factors (including changes in foreign currency exchange rates, interest rates and changes to tax laws or the application or enforcement practices of such laws), or volatility or lack of confidence in the financial markets may adversely affect certain portions of our business, financial condition, and results of operations.

Declines in the value of securities held in our investment portfolio can affect us negatively.

Our investment securities portfolio represents a greater proportion, and our loan portfolio represents a smaller proportion, of our total consolidated assets in comparison to many other financial institutions. The value of securities available for sale and held to maturity within our investment portfolio, which is generally determined based upon market values available from third-party sources, have fluctuated, and may continue in the future to fluctuate, as a result of market volatility and economic or financial market conditions. For example, in 2023, and again in early 2024, we realized notable losses on the sale of available for sale securities and we may realize additional losses in the future. Declines in the value of securities held in our investment portfolio negatively impact our levels of capital, liquidity, and, to the extent we realize losses, earnings. Although we have policies and procedures in place to assess and mitigate potential impacts of market risks, including hedging-related strategies, those policies and procedures are inherently limited because they cannot anticipate the existence or future development of currently unanticipated or unknown risks. Accordingly, market risks have, from time to time, negatively affected the value of securities held in our investment portfolio and in the future we could suffer additional adverse effects as a result of our failure to anticipate and manage these risks properly.

Volatility levels and fluctuations in foreign currency exchange rates may affect our earnings.

We provide foreign exchange services to our clients, primarily in connection with our global custody business. Foreign currency volatility influences our foreign exchange trading income as does the level of client activity. Foreign currency volatility and changes in client activity may result in reduced foreign exchange trading income. Fluctuations in exchange rates may raise the potential for losses resulting from foreign currency trading positions where aggregate obligations to purchase and sell a currency other than the U.S. dollar do not offset each other or offset each other in different time periods. We also are exposed to non-trading foreign currency risk as a result of our holdings of non-U.S. dollar denominated assets and liabilities, investments in non-U.S. subsidiaries, and future non-U.S. dollar denominated revenue and expense.

We have policies and procedures in place to assess and mitigate potential impacts of foreign exchange risks, including hedging-related strategies. Any failure or circumvention of our procedures to mitigate risk may impact earnings negatively. Please see “Market Risk” in the “Risk Management” section included in Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” for a more detailed discussion of market risks we face.

Changes in a number of particular market conditions can affect our earnings negatively.

In past periods, reductions in the volatility of currency-trading markets, the level of cross-border investing activity, and the demand for borrowing securities or willingness to lend such securities have affected our earnings from activities such as foreign exchange trading and securities lending negatively. If these conditions occur in the future, our earnings from these activities may be affected negatively. In certain of our businesses, such as securities lending, our fee is calculated as a percentage of our clients’ earnings, such that market and other factors that reduce our clients’ earnings from investments or trading activities also reduce our revenues.

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Operational Risks

Many types of operational risks can affect our earnings negatively.

We regularly assess and monitor operational risk in our businesses. Despite our efforts to assess and monitor operational risk, our risk management program may not be effective in all cases. Factors that can impact operations and expose us to risks varying in size, scale and scope, some or all of which may be exacerbated by the trend toward hybrid and remote working arrangements in recent years, include:

•failures of technological systems or networks or breaches of security measures, including, but not limited to, those resulting from computer viruses, cyber-attacks or other information security incidents;

•human errors or omissions, including failures to comply with applicable laws or corporate policies and procedures;

•theft, fraud or misappropriation of assets, whether arising from the intentional actions of internal personnel or external third parties;

•defects or interruptions in computer or communications systems;

•breakdowns in processes and internal controls; over-reliance on manual processes and controls, which are less scalable than automated processes and controls;

•failures of the systems and facilities that support our operations;

•failure of any third-party vendor to properly execute the processes on which Northern Trust relies;

•unsuccessful or difficult implementation of computer systems upgrades;

•defects in product design or delivery;

•difficulty in accurately pricing assets, which can be aggravated by market volatility and illiquidity and lack of reliable pricing from third-party vendors;

•negative developments in relationships with key counterparties, third-party vendors, employees or associates in our day-to-day operations; and

•external events that are wholly or partially beyond our control, such as pandemics, geopolitical events, political or social unrest, natural disasters or acts of terrorism.

While we have in place many controls and business continuity plans designed to address many of these factors, these plans may not operate successfully to mitigate these risks effectively. We also may fail to identify or fully understand the implications and risks associated with changes in the financial markets or our businesses—particularly as our geographic footprint, product pipeline and client needs and expectations evolve—and consequently fail to enhance our controls and business continuity plans to address those changes in an adequate or timely fashion. If our controls and business continuity plans do not address the factors noted above and operate to mitigate the associated risks successfully, such factors may have a negative impact on our business (including operational resilience), financial condition or results of operations. In addition, an important aspect of managing our operational risk is creating a risk culture in which all employees fully understand the inherent risk in our business and the importance of managing risk as it relates to their job functions. We continue to enhance our risk management program to support our risk culture, ensuring that it is sustainable and appropriate for our role as a major financial institution. Nonetheless, if we fail to provide the appropriate environment that sensitizes all of our employees to managing risk, our business could be impacted adversely. Please see “Other Risks” in this “Risk Factors” section for further description of risks associated with the systems and models we employ to analyze, monitor and mitigate risks.

We are highly dependent on information technology systems and networks, many of which are operated by third parties, and any failures of, or disruptions to, our or such third parties’ technological systems or networks could materially and adversely affect our business.

Our business is dependent on our and third parties’ information technology systems and networks. Any failure, interruption or breach in the security of any such systems or networks could severely disrupt our operations and could subject us to liability claims, harm our reputation, interrupt our operations, or otherwise adversely affect our business, financial condition or results of operations.

Additionally, our computer, communications, data processing, networks, backup, business continuity or other operating, information or technology systems, including those that we outsource to providers, may fail to operate properly or become disabled, overloaded or damaged as a result of a number of factors, including events that are wholly or partially beyond our control, which could have a negative effect on our ability to conduct our business activities.

The third parties with which we do business also are susceptible to the foregoing risks (including regarding the third parties with which they are similarly interconnected or on which they otherwise rely), and our or their business operations and activities may therefore be affected adversely, perhaps materially, by failures, terminations, errors or malfeasance by, or attacks or constraints on, one or more financial, technology, infrastructure or government institutions or intermediaries with whom we or they are interconnected or conduct business.

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Our business interruption insurance may be inadequate to compensate us for all losses that may occur as a result of any system, network or operational failure or disruption.

Breaches of our security measures, including, but not limited to, those resulting from cyber-attacks or other information security incidents, may result in losses.

Our systems involve the storage, transmission and other processing of clients’ and our personal, proprietary, confidential and sensitive information, and security breaches, including cyber-attacks or other information security incidents, could expose us to a risk of theft, loss, destruction, gathering, monitoring, dissemination, misappropriation, misuse, alteration, or unauthorized disclosure of or unauthorized access to this information. Despite our implementation of a variety of security measures, our computer systems, networks, and data, including clients’ or our personal, proprietary, confidential and sensitive information, could be subject to cyber-attacks or other information security incidents, such as, among other things, from physical and electronic break-ins or unauthorized tampering, malware and computer virus attacks, ransomware attacks, social engineering attacks (including phishing attacks) or denial-of-service attacks. Our security measures also may be breached due to the actions of outside parties, employee error, failure of our controls with respect to access to our systems, malfeasance or otherwise. Any failure, interruption or breach in the security of our systems could severely disrupt our operations and could subject us to liability claims, harm our reputation, interrupt our operations, or otherwise adversely affect our business, financial condition or results of operations.

Data privacy and security risks for large financial institutions like us are significant in part because of the evolving proliferation of new technologies, the use of internet-based solutions, mobile devices, and cloud technologies to conduct financial transactions and the increased sophistication and rapidly evolving techniques of hackers, terrorists, organized crime and other external parties, including foreign state actors and state-sponsored actors, any of which may see their effectiveness enhanced by the use of artificial intelligence. Data privacy and security risks also may derive from fraud or malice on the part of our employees or third parties, or may result from human error, software bugs, server malfunctions, software or hardware failure or other technological failure. If we fail to continue to upgrade our technology infrastructure to ensure effective data privacy and security relative to the type, size and complexity of our operations, we could become more vulnerable to cyber-attacks and other information security incidents and, consequently, subject to significant regulatory penalties and reputational damage. Also, like many large enterprises, the trend in the past several years toward a hybrid work environment that includes a combination of in-office and remote work creates a broader attack surface for, and potential vulnerabilities from, cyber threats.

While we generally conduct security assessments on third-party vendors, we cannot be certain that their information security protocols are sufficient to withstand a cyber-attack or other information security incident. Some of our vendors may store or have access to our data and may not have effective controls, processes, or practices to protect our information from loss, unauthorized disclosure, unauthorized use or misappropriation, cyber-attacks or other information security incidents. In addition, our clients often use personal devices, such as computers, smart phones and tablets, which are particularly vulnerable to loss and theft, as well as third parties with whom they share information used for authentication, to access our systems and networks and manage their accounts, which may heighten the risk of system failures, interruptions or security breaches.

Moreover, the increased use of mobile and cloud technologies could heighten these and other operational risks. Reliance on mobile or cloud technology or any failure by mobile technology and cloud service providers to adequately safeguard their systems and networks and prevent cyber-attacks or other information security incidents could disrupt our operations or the operations of our or their service providers and result in misappropriation, corruption or loss of personal, confidential, proprietary, or other sensitive information or the inability to conduct ordinary business operations. In addition, there is a risk that encryption and other protective measures may be circumvented, particularly to the extent that new computing technologies increase the speed and computing power available. A vulnerability in our service providers’ software or systems, a failure of our service providers’ safeguards, policies or procedures, or a cyber-attack or other information security incident affecting any of these third parties could harm our business.

In recent years, several financial services firms suffered successful cyber-attacks launched both domestically and from abroad, resulting in the disruption of services to clients, loss or misappropriation of sensitive or private information, and reputational harm. We and our clients have been, and expect to continue to be, subject to a wide variety of cyber-attacks and other similar threats, including computer viruses, ransomware and other malicious code, distributed denial-of-service attacks, and phishing and vishing attacks, and it is possible that we could suffer material losses resulting from a breach. Because the techniques used to obtain unauthorized access, disable or degrade service or sabotage systems and networks change frequently and often are not recognized until launched against a target, we may be unable to anticipate these techniques, to implement adequate preventative measures, or to address them until they are discovered. In addition, successful cyber-attacks may persist for an extended period of time before being detected. Because any investigation of an information security incident would be inherently unpredictable, the extent of a particular information security incident and the path of investigating the incident may not be immediately clear. It may take a significant amount of time before such an

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investigation can be completed and full and reliable information about the incident is known. While such an investigation is ongoing, we may not necessarily know the extent of the harm or how best to remediate it, certain errors or actions could be repeated or compounded before they are discovered and remediated, and communication to the public, regulators, clients and other stakeholders may be inaccurate, any or all of which could further increase the costs and consequences of an information security incident.

We could be the subject of legal claims or proceedings related to information security incidents, including regulatory investigations and other legal actions, carrying the potential for damages, fines, sanctions or other penalties, injunctive relief requiring costly compliance measures and reputational damage. Further, the market perception of the effectiveness of our information security measures could be harmed, our reputation could suffer and we could lose clients in conjunction with security incidents, each of which could have a negative effect on our business, financial condition and results of operations. A breach of our security also may affect adversely our ability to effect transactions, service our clients, manage our exposure to risk or expand our business. An event that results in the loss of information also may require us to reconstruct lost data or reimburse clients for data and credit monitoring services, which could be costly and have a negative impact on our business and reputation. Although we maintain insurance coverage in the event of information theft, damage, or destruction from cyber-attacks or other information security incidents, there can be no assurance that liabilities or losses we may incur will be covered under such policies, that the amount of insurance will be adequate to cover such losses, that insurance will continue to be available to us on economically reasonable terms, or at all, or that our insurer will not deny coverage as to any future claim.

Further, even if not directed at us, attacks on financial or other institutions important to the overall functioning of the financial system or on our counterparties could affect, directly or indirectly, aspects of our business.

Errors, breakdowns in controls or other mistakes in the provision of services to clients or in carrying out transactions for our own account can subject us to liability, result in losses or have a negative effect on our earnings in other ways.

In our asset servicing, investment management, fiduciary administration and other business activities, we effect or process transactions for clients and for ourselves that involve very large amounts of money. Failure to manage or mitigate operational risks properly can have adverse consequences, and increased volatility in the financial markets may increase the magnitude of resulting losses. Further, remote working and other modified business practices initiated in recent years, combined with the increasing sophistication and frequency of potential cyber-attacks and other information security incidents, have heightened our operational and execution risk. Given the high volume of transactions we process, errors that affect earnings may be repeated or compounded before they are discovered and corrected.

Our dependence on technology, and the need to update frequently our technology infrastructure, exposes us to risks that also can result in losses.

Our businesses depend on information technology infrastructure, both internal and external, to record and process, among other things, a large volume of increasingly complex transactions and other data, in many currencies, on a daily basis, across numerous and diverse markets and jurisdictions. Due to our dependence on technology and the important role it plays in our business operations, combined with the increasing sophistication and frequency of potential cyber-attacks and other information security incidents, we must constantly improve and update our information technology infrastructure. Upgrading, replacing, and modernizing these systems can require significant resources and often involves implementation, integration and security risks that could cause financial, reputational, and operational harm. In recent years, there has been an acceleration in the transition from traditional to digital financial services and heightened customer expectations in this area, and this transition may require us to invest greater resources in technological advancements. Failure to ensure adequate review and consideration of critical business and regulatory issues prior to and during the introduction and deployment of key technological systems or networks or failure to align operational capabilities adequately with evolving client commitments and expectations may have a negative impact on our results of operations. The failure to respond properly to, and invest in, changes and advancements in technology and/or to compete for and retain employees with the necessary technical skills and expertise could limit our ability to attract and retain clients, prevent us from offering products and services comparable to those offered by our competitors, inhibit our ability to meet regulatory requirements or otherwise have a material adverse effect on our operations.

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A failure or circumvention of our controls and procedures could have a material adverse effect on our business, financial condition and results of operations.

We regularly review and update our internal controls, disclosure controls and procedures, and corporate governance policies and procedures. Any system of controls, however well designed and operated, is based in part on certain assumptions and can provide only reasonable, not absolute, assurances that the objectives of the system will be met. Any failure or circumvention of our controls and procedures or failure to comply with regulations related to controls and procedures could have a material adverse effect on our business, financial condition and results of operations. If we identify material weaknesses in our internal control over financial reporting or are otherwise required to restate our financial statements, we could be required to implement expensive and time-consuming remedial measures and could lose investor confidence in the accuracy and completeness of our financial reports. In addition, there are risks that individuals, either employees or contractors, consciously circumvent established control mechanisms by, for example, exceeding trading or investment management limitations, or committing fraud.

Failure of any of our third-party vendors (or their vendors) to perform can result in losses.

Third-party vendors provide key components of our business operations such as data processing, recording and monitoring transactions, online banking interfaces and services, and network access. Our use of third-party vendors exposes us to the risk that such vendors (or their vendors) may not comply with their servicing and other contractual obligations, including with respect to indemnification and information security, and to the risk that we may not satisfy applicable regulatory responsibilities regarding the management and oversight of third parties and outsourcing providers. While we have established risk management processes and continuity plans, any disruptions in service from a key vendor for any reason or poor performance of services have in the past and could in the future have a negative effect on our ability to deliver products and services to our clients and conduct our business. Replacing these third-party vendors or performing the tasks they perform for ourselves has in the past and could in the future create significant delay and expense.

We are subject to certain risks inherent in operating globally which may affect our business adversely.

In conducting our U.S. and non-U.S. business, we are subject to risks of loss and adverse economic impacts from various unfavorable political, economic, legal, public health, or other developments, including social or political instability, changes in governmental policies or policies of central banks, expropriation, nationalization, confiscation of assets, price controls, capital controls, exchange controls, unfavorable tax rate changes, tax court rulings and changes in laws and regulations. Less mature and often less regulated business and investment environments heighten these risks in various emerging markets. Our non-U.S. operations accounted for 32% of our revenue in 2023. Our non-U.S. businesses are subject to extensive regulation by various non-U.S. regulators, including governments, securities exchanges, central banks and other regulatory bodies in the jurisdictions in which those businesses operate. In many countries, the laws and regulations applicable to the financial services industry are uncertain and evolving and may be applied with extra scrutiny to foreign companies. Moreover, the regulatory and supervisory standards and expectations in one jurisdiction may not conform with standards or expectations in other jurisdictions. Even within a particular jurisdiction, the standards and expectations of multiple supervisory agencies exercising authority over our affairs may not be harmonized fully. Accordingly, it may be difficult for us to determine the exact requirements of local laws in every market or manage our relationships with multiple regulators in various jurisdictions. Our inability to remain in compliance with local laws in a particular market and manage our relationships with regulators could have an adverse effect not only on our businesses in that market but also on our reputation generally. The failure to mitigate properly such risks or the failure of our operating infrastructure to support such international activities could result in operational failures and regulatory fines or sanctions, which could affect our business and results of operations adversely.

We actively strive to optimize our geographic footprint. This optimization may occur by establishing operations in lower-cost locations or by outsourcing to third-party vendors in various jurisdictions. These efforts expose us to the risk that we may not maintain service quality, control or effective management within these operations. In addition, we are exposed to the relevant macroeconomic, political, public health, and similar risks generally involved in doing business in those jurisdictions. The increased elements of risk that arise from conducting certain operating processes in some jurisdictions could lead to an increase in reputational risk. During periods of transition, greater operational risk and client concern exist with respect to maintaining a high level of service delivery.

In addition, we are subject in our global operations to rules and regulations relating to corrupt and illegal payments, money laundering, and laws that prohibit us from doing business with certain individuals, groups and countries, such as the U.S. Foreign Corrupt Practices Act, the USA PATRIOT Act, the UK Bribery Act, and economic sanctions and embargo programs administered by the U.S. Office of Foreign Assets Control and similar agencies worldwide. While we have invested and continue to invest significant resources in training and in compliance monitoring, the geographic diversity of our operations, employees, clients and customers, as well as the vendors and other third parties with whom we deal, presents the risk that we may be found in violation of such rules, regulations, laws or programs and any such violation could subject us to significant penalties or affect our reputation adversely.

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Failure to control our costs and expenses adequately could affect our earnings negatively.

Our success in controlling the costs and expenses of our business operations also impacts operating results. Through various parts of our business strategy, we aim to produce efficiencies in operations that help reduce and control costs and expenses, including the costs of losses associated with operating risks attributable to servicing and managing financial assets. In recent years, increased expenses have affected—and a failure to control our costs and expenses in the future, whether as a result of inflation or otherwise, could affect—our earnings negatively.

Pandemics, natural disasters, global climate change, acts of terrorism, geopolitical tensions, and global conflicts may have a negative impact on our business and operations.

Pandemics, natural disasters, global climate change, acts of terrorism, geopolitical tensions, global conflicts (including the continuing military conflicts involving Ukraine and the Russian Federation and Israel and Hamas) or other similar events, as well as government actions or other restrictions in connection with such events, have had in the past, or may in the future have, a negative impact on our business and operations. While we have in place business continuity plans, such events may still damage our facilities, disrupt or delay the normal operations of our business (including communications and technology), result in harm to or cause travel limitations on our employees, impose significant compliance costs with new financial and economic sanctions regimes, and have a similar impact on our clients, suppliers, third-party vendors and counterparties. For example, in some jurisdictions such as the Russian Federation, local market restrictions, laws, sanctions programs or government intervention inhibit our clients’ and our ability to access or transfer cash or securities held for clients through subcustodians and clearing agencies. When such client deposit liabilities are on our consolidated balance sheet, we maintain a corresponding amount of cash on deposit with the subcustodian or clearing agency, which increases our credit exposure to that entity and can accumulate over time based upon distributions on, or other activities related to, our clients’ assets. If the subcustodian or clearing agency were to become insolvent in circumstances not involving expropriation of assets or other sovereign risk events and/or factors or events beyond our reasonable control that excuse performance under force majeure or other contractual provisions, the risk of loss on such cash on deposit may potentially be incurred by us. As of December 31, 2023, we held cash that accumulates in relation to Russian securities with our subcustodian and/or clearing agencies for the benefit of certain clients in our Asset Servicing business which are subject to restrictions that inhibit our ability to access or transfer such deposits, and which amount is expected to increase significantly over time as long as the sanctions and other relevant restrictions remain in effect. Our subcustodian is also a subsidiary of a large, global financial institution with whom we have other credit exposures, which may limit the financial relationship we may have with this counterparty and has in the past made, and may in the future make, compliance with specific U.S. regulatory single counterparty credit limits more challenging.

The foregoing or similar events also could impact us negatively to the extent that they result in reduced capital markets activity, lower asset price levels, or disruptions in general economic activity in the U.S. or abroad, or in financial market settlement functions. In addition, these or similar events may impact economic growth negatively, which could have an adverse effect on our business and operations, and may have other adverse effects on us in ways that we are unable to predict. Please see “Strategic Risks” in this “Risk Factors” section for further description of risks associated with climate change.

Credit Risks

Failure to evaluate accurately the prospects for repayment when we extend credit or maintain an adequate allowance for credit losses can result in losses or the need to make additional provisions for credit losses, both of which reduce our earnings.

We evaluate extensions of credit before we make them and provide for credit risks based on our assessment of the credit losses inherent in our loan portfolio, including undrawn credit commitments. This process requires us to make difficult and complex judgments, including forecasts of economic conditions through the life of these credit exposures. Challenges associated with our credit risk assessments include identifying the proper factors to be used in assessments and accurately estimating the impacts of those factors. Allowances that prove to be inadequate may require us to realize increased provisions for credit losses or write down the value of certain assets on our balance sheet, which result in losses and/or increased provisions for credit losses and in turn would affect earnings negatively.

Market volatility and/or weak economic conditions can result in losses or the need for additional provisions for credit losses, both of which reduce our earnings.

Credit risk levels and our earnings can be affected by market volatility and/or weakness in the economy in general and in the particular locales in which we extend credit, a deterioration in credit quality, or a reduced demand for credit. Adverse changes in the financial performance or condition of our borrowers resulting from market volatility, elevated interest rates, and/or weakened economic conditions could impact the borrowers’ abilities to repay outstanding loans, which could in turn impact our financial condition and results of operations negatively.

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The failure or perceived weakness of any of our significant counterparties could expose us to loss.

The financial markets are characterized by extensive interconnections among financial institutions, including banks, broker-dealers, collective investment funds and insurance companies. As a result of these interconnections, we and many of our clients have counterparty exposure to other financial institutions. This counterparty exposure presents risks to us and to our clients because the failure or perceived weakness of any of our counterparties has the potential to expose us to risk of loss. Instability in the financial markets, or in certain countries where these counterparties are domiciled, has resulted historically in some financial institutions becoming less creditworthy. During such periods of instability, we are exposed to increased counterparty risks, both as principal and in our capacity as agent for our clients. Changes in market perception of the financial strength of particular financial institutions can occur rapidly, are often based upon a variety of factors and can be difficult to predict. In addition, the criteria for and manner of governmental support of financial institutions and other economically important sectors remain uncertain. Further, the consolidation of financial services firms and the failures of other financial institutions has in the past increased, and may in the future increase, the concentration of our counterparty risk. These risks are heightened by the fact that our operating model relies on the use of unaffiliated sub-custodians to a greater degree than certain of our competitors that have banking operations in more jurisdictions than we do. We are not able to mitigate all of our and our clients’ counterparty credit risk. If a significant individual counterparty defaults on an obligation to us, we could incur financial losses that have a material and adverse effect on our business, financial condition and results of operations.

Liquidity Risks

If we do not manage our liquidity effectively, our business could suffer.

Liquidity is essential for the operation of our business. Market conditions, unforeseen outflows of funds or other events could have a negative effect on our level or cost of funding, affecting our ongoing ability to accommodate liability maturities and deposit withdrawals, meet contractual obligations, and fund new business transactions at a reasonable cost and in a timely manner. If our access to stable and low-cost sources of funding, such as customer deposits, is reduced, we may need to use alternative funding, which could be more expensive or of limited availability. Further evolution in the regulatory requirements relating to liquidity and risk management also may impact us negatively. Additional regulations may impose more stringent liquidity requirements for large financial institutions, including the Corporation and the Bank. Given the overlap and complex interactions of these regulations with other regulatory changes, the full impact of the adopted and proposed regulations remains uncertain until their full implementation.

In addition, a significant portion of our business involves providing certain services to large, complex clients, which, by their nature, require substantial liquidity. Our failure to manage successfully the liquidity and balance sheet issues attendant to this portion of our business may have a negative impact on our ability to meet client needs and grow.

We also manage investment products that, while not obligations of ours, may be exposed to liquidity risks. These products, such as money market and other short-term investments provide clients a right to the return of cash or assets on limited notice. If clients demand a return of their cash or assets, particularly on limited notice, and these investment products do not have the liquidity to support those demands, we could be forced to sell investment securities held by these investment products at unfavorable prices potentially damaging our reputation with the investment community.

For more information on regulations and other regulatory changes relating to liquidity, see “Supervision and Regulation—Liquidity Standards” in Item 1, “Business.” Any substantial, unexpected or prolonged changes in the level or cost of liquidity could affect our business adversely.

If the Bank is unable to supply the Corporation with funds over time, the Corporation could be unable to meet its various obligations.

The Corporation is a legal entity separate and distinct from the Bank and the Corporation’s other subsidiaries. The Corporation relies in large part on dividends paid to it by the Bank to meet its obligations and to pay dividends to stockholders of the Corporation. There are various legal limitations on the extent to which the Bank and the Corporation’s other subsidiaries can supply funds to the Corporation by dividend or otherwise. Dividend payments by the Bank to the Corporation in the future will require continued generation of earnings by the Bank and could require regulatory approval under certain circumstances. For more information on dividend restrictions, see “Supervision and Regulation—Payment of Dividends” in Item 1, “Business.”

We may need to raise additional capital in the future, which may not be available to us or may only be available on unfavorable terms.

We may need to raise additional capital to provide sufficient resources to meet our business needs and commitments, to accommodate the transaction and cash management needs of our clients, to maintain our credit ratings in response to regulatory changes, including capital rules, or for other purposes. However, our ability to access the capital markets, if needed, will depend on a number of factors, including the state of the financial markets. Rising interest rates, disruptions in financial markets, negative perceptions of our business or our financial strength, or other factors may impact our ability to raise additional capital, if needed, on terms acceptable to us. For example, in the event of future turmoil in the banking

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industry or other idiosyncratic events, there is no guarantee that the U.S. government will invoke the systemic risk exception, create additional liquidity programs, or take any other action to stabilize the banking industry or provide liquidity. Any diminished ability to access short-term funding or capital markets to raise additional capital, if needed, could subject us to liability, restrict our ability to grow, require us to take actions that would affect our earnings negatively or otherwise affect our business and our ability to implement our business plan, capital plan and strategic goals adversely.

Any downgrades in our credit ratings, or an actual or perceived reduction in our financial strength, could affect our borrowing costs, capital costs and liquidity adversely.

Rating agencies publish credit ratings and outlooks on our creditworthiness and that of our obligations or securities, including long-term debt, short-term borrowings, preferred stock and other securities. Our credit ratings are subject to ongoing review by the rating agencies and thus may change from time to time based on the agencies’ evaluation of a number of factors, including our financial strength, performance, prospects and operations as well as factors not under our control, such as rating-agency-specific criteria or frameworks for our industry or certain security types, which are subject to revision from time to time, and conditions affecting the financial services industry generally.

Downgrades in our credit ratings may affect our borrowing costs, our capital costs and our ability to raise capital and, in turn, our liquidity adversely. A failure to maintain an acceptable credit rating also may preclude us from being competitive in certain products. Additionally, our counterparties, as well as our clients, rely on our financial strength and stability and evaluate the risks of doing business with us. If we experience diminished financial strength or stability, actual or perceived, a decline in our stock price or a reduced credit rating, our counterparties may be less willing to enter into transactions, secured or unsecured, with us, our clients may reduce or place limits on the level of services we provide them or seek other service providers, or our prospective clients may select other service providers, all of which may have other adverse effects on our business.

The risk that we may be perceived as less creditworthy relative to other market participants is higher in a market environment in which the consolidation, and in some instances failure, of financial institutions, including major global financial institutions, could result in a smaller number of larger counterparties and competitors. If our counterparties perceive us to be a less viable counterparty, our ability to enter into financial transactions on terms acceptable to us or our clients, on our or our clients’ behalf, will be compromised materially. If our clients reduce their deposits with us or select other service providers for all or a portion of the services we provide to them, our revenues will decrease accordingly.

Regulatory and Legal Risks

Failure to comply with regulations and/or supervisory expectations can result in penalties and regulatory constraints that restrict our ability to grow or even conduct our business, or that reduce earnings.

Virtually every aspect of our business around the world is regulated, generally by domestic and foreign governmental agencies that have broad supervisory powers and the ability to impose sanctions. These regulations cover a variety of matters, including prohibited activities, required capital levels, resolution planning, human trafficking and modern slavery, and data privacy and security. Some of these requirements are directed specifically at protecting depositors of the Bank, the U.S. DIF and the banking system as a whole, not our stockholders or other security holders. Regulatory violations or the failure to meet formal or informal commitments made to regulators could generate penalties, require corrective actions that increase costs of conducting business, result in limitations on our ability to conduct business, restrict our ability to expand or impact our reputation adversely. Failure to obtain necessary approvals from regulatory agencies, whether formal or based upon supervisory expectations, on a timely basis could affect proposed business opportunities and results of operations adversely. Similarly, changes in laws or failure to comply with new requirements or with future changes in laws or regulations may impact our results of operations and financial condition negatively.

We are subject to extensive and evolving government regulation and supervision that impacts our operations. Changes by the U.S. and other governments to laws, regulations and policies applicable to the financial services industry may heighten the challenges we face and make regulatory compliance more difficult and costly.

We operate in a highly regulated environment, and are subject to a comprehensive statutory and regulatory regime affecting all aspects of our business and operations, including oversight by governmental agencies both inside and outside the U.S. Various regulatory bodies have demonstrated heightened scrutiny of financial institutions through many regulatory initiatives. These initiatives have increased compliance costs and regulatory risks and may lead to financial and reputational damage in the event of a compliance violation, even if the failure to comply was inadvertent or reflects a difference in interpretation. We have programs in place, including policies, training and various forms of monitoring, designed to ensure compliance with legislative and regulatory requirements. We cannot provide assurance that these programs and policies are or will be adequate to identify and manage internal and external compliance risks. For example, our business may be adversely impacted by actual or alleged misconduct by an employee or other negative outcomes caused by human error. Changes to statutes, regulations or regulatory and supervisory policies or their interpretation or implementation and the continued heightening of regulatory and supervisory requirements could affect us in substantial and unpredictable ways.

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Additionally, governments and regulators may take actions that increase intervention in the normal operation of our businesses and the businesses of our competitors in the financial services industry, and these likely would involve additional legislative and regulatory requirements imposed on banks and other financial services companies. Any such actions could increase compliance costs and regulatory risks, lead to financial and reputational damage in the event of a violation, affect our ability to compete successfully, and also may impact the nature and level of competition in the industry in unpredictable ways. The full scope and impact of possible legislative or regulatory changes and the extent of regulatory activity is uncertain and difficult to predict. For example, we are unable to predict what, if any, changes to financial services laws and regulations applicable to the financial services industry may be enacted by the U.S. Congress and what the impact of any such changes will be upon our business, financial condition, and results of operations.

The evolving regulatory and supervisory environment and uncertainty about the timing and scope of future laws, regulations and policies may contribute to decisions we may make to suspend, reduce or withdraw from existing businesses, activities or initiatives, which may result in potential lost revenue or significant restructuring or related costs or exposures. We also face the risk of becoming subject to new or more stringent requirements in connection with the introduction of new regulations or modification of existing regulations, which could require us to hold more capital or liquidity or have other adverse effects on our businesses or profitability. For example, proposed changes to applicable capital and liquidity requirements, such as the Basel III Endgame Proposal and the long-term debt proposal, could result in increased expenses or cost of funding, which could negatively affect our financial results or our ability to pay dividends and engage in share repurchases. For more information concerning our legal and regulatory obligations with respect to Basel III and long-term debt requirements, see “Supervision and Regulation” in Item 1, “Business.”

In addition, regulatory responses in connection with severe market downturns or unforeseen stress events may alter or disrupt our planned future strategies and actions. Adverse developments affecting the overall strength and soundness of other financial institutions, the financial services industry as a whole and the general economic climate and the U.S. Treasury market could have a negative impact on perceptions about the strength and soundness of our business even if we are not subject to the same adverse developments. For example, during 2023, the FDIC took control and was appointed receiver of Silicon Valley Bank, Signature Bank, and First Republic Bank. The failure of other banks and financial institutions and the measures taken by governments and regulators in response to these events could adversely impact our business, financial condition and results of operations.

We are subject to complex and evolving laws, regulations, rules, standards and contractual obligations regarding data privacy and security, which could increase the cost of doing business, compliance risks and potential liability.

We are subject to complex and evolving laws, regulations, rules, standards and contractual obligations governing data privacy and security, which may differ and potentially conflict, in various jurisdictions, and any failure to comply with these laws, regulations, rules, standards and contractual obligations could expose us to liability and/or reputational damage. Regulators globally are introducing the potential for greater monetary fines on institutions that suffer from breaches leading to the loss, misappropriation or unauthorized access, use or disclosure of personal, confidential, proprietary or sensitive information. Most U.S. states, the EU and other non-U.S. jurisdictions also have adopted their own statutes and/or regulations concerning data privacy and security and notification of data breaches. These and other changes in laws or regulations associated with the enhanced protection of personal and other types of information could greatly increase compliance costs, the size of potential fines related to the protection of such information and reporting obligations in the case of cyber-attacks or other information security incidents. Compliance with these laws, regulations, rules and standards may require us to change and continuously update our policies, procedures and technology controls for information security, which could, among other things, make us more vulnerable to operational failures and to monetary penalties for breach of such laws, regulations, rules and standards.

In the U.S., there are numerous federal, state and local data privacy and security laws and regulations governing the collection, sharing, use, retention, disclosure, security, storage, transfer and other processing of personal information. At the federal level, we are subject to, among other laws and regulations, the rules and regulations promulgated under the authority of the Federal Trade Commission and the Gramm-Leach-Bliley Act. Moreover, the U.S. Congress has recently considered, and is currently considering, various proposals for more comprehensive data privacy and security legislation, to which we may be subject if enacted. At the state level, we are subject to laws and regulations such as the CCPA. Numerous other states also have enacted, or are in the process of enacting or considering, comprehensive state-level data privacy and security laws and regulations that share similarities with the CCPA. Moreover, laws in all 50 U.S. states require businesses to provide notice under certain circumstances to consumers whose personal information has been disclosed as a result of a data breach.

At the international level, we are subject to the GDPR and UK GDPR and similar laws are in effect or being considered in other jurisdictions in which we operate across the globe. While the GDPR and the UK GDPR remain substantially similar for the time being, the UK government has announced that it would seek to chart its own path on data protection and reform its relevant laws, including in ways that may differ from the GDPR, to an extent. Legal developments in the EEA and the UK also have created complexity and uncertainty regarding processing and transfers of

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personal data from the EEA and the UK to the U.S. and other so-called third countries outside the EEA and the UK that have not been determined by the relevant data protection authorities to provide an adequate level of protection for privacy rights. Importantly, significant monetary fines have been imposed since the introduction of such stringent privacy laws in the EU and the UK and regulatory expectations on governance and accountability in the protection of privacy and data continue to increase.

Further, while we strive to publish and prominently display privacy notices and policies that are accurate, comprehensive, and compliant with applicable laws, regulations, rules and industry standards, we cannot ensure that our privacy policies and other statements regarding our practices will be considered sufficient to protect us from claims, proceedings, liability or adverse publicity relating to data privacy and security, considering the fast-evolving regulatory expectations. Although we endeavor to comply with our privacy policies, we may at times fail to do so or be alleged to have failed to do so. The publication of our privacy policies and other documentation that provide promises and assurances about data privacy and security can subject us to potential government or legal action if they are found to be deceptive, unfair, or misrepresentative of our actual practices. Any concerns about our data privacy and security practices, even if unfounded, could damage our reputation and adversely affect our business.

Any failure or perceived failure by us to comply with our privacy policies, or applicable data privacy and security laws, regulations, rules, standards or contractual obligations, or any compromise of security that results in unauthorized access to, or unauthorized loss, destruction, use, modification, acquisition, disclosure, release or transfer of personal information, may result in requirements to modify or cease certain operations or practices, the expenditure of substantial costs, time and other resources, proceedings or actions against us, legal liability, governmental investigations, enforcement actions, claims, fines, judgments, awards, penalties, sanctions and costly litigation (including class actions). Any of the foregoing could harm our reputation, distract our management and technical personnel, increase our costs of doing business, adversely affect the demand for our products and services, and ultimately result in the imposition of liability, any of which could have a material adverse effect on our business, financial condition and results of operations.

We may be impacted adversely by claims or litigation, including claims or litigation relating to our fiduciary responsibilities.

Our businesses involve the risk that clients or others may sue us, claiming that we or third parties for whom they say we are responsible have failed to perform under a contract or otherwise failed to carry out a duty perceived to be owed to them. Our trust, custody and investment management businesses are particularly subject to this risk. This risk is heightened when we act as a fiduciary for our clients and may be further heightened during periods when credit, equity or other financial markets are deteriorating in value or are particularly volatile, or when clients or investors are experiencing losses. In addition, regulators, tax authorities and courts have increasingly sought to hold financial institutions liable for the misconduct of their clients where such regulators and courts have determined that the financial institution should have detected that the client was engaged in wrongdoing, even though the financial institution had no direct knowledge of the wrongdoing.

Claims made or actions brought against us, whether founded or unfounded, may result in lawsuits, injunctions, settlements, damages, fines or penalties, which could have a material adverse effect on our financial condition or results of operations or require changes to our business. Even if we defend ourselves successfully, the cost of litigation is often substantial, and public reports regarding claims made against us may cause damage to our reputation among existing and prospective clients or negatively impact the confidence of counterparties, rating agencies and stockholders, consequently affecting our earnings negatively.

We may be impacted adversely by supervisory and/or regulatory enforcement matters.

In the ordinary course of our business, we are subject to various governmental enforcement inquiries, supervisory examinations, investigations and subpoenas. These may be directed generally to participants in the businesses in which we are involved or may be directed specifically at us. In conjunction with both supervisory and enforcement matters, we may face limits on our ability to conduct or expand our business, be required to implement corrective actions that increase the costs of conducting business, or become subject to civil or criminal penalties or other remedial sanctions, any of which could result in reputational damage or otherwise have an adverse impact on us.

The complexity of the federal and state regulatory, supervisory and enforcement regimes in the U.S., coupled with the global scope of our operations and the increased aggressiveness of the tax and regulatory environment worldwide, also means that a single event may give risk to a large number of overlapping investigations and regulatory proceedings, either by multiple agencies in the U.S. or by multiple regulators and other governmental entities or tax authorities in different jurisdictions. Responding to inquiries, investigations, and proceedings, regardless of the outcome of the matter, is time consuming and expensive and can divert the attention of our senior management from our business. The outcome of such proceedings may be difficult to predict or estimate until late in the proceedings, which may last a number of years.

The number of regulatory and governmental investigations and proceedings, as well as the amount of penalties and fines sought, has remained elevated for many firms in the financial services industry. The Corporation and other financial

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institutions have become subject to increased scrutiny, more intense supervision and regulation, and a higher risk of enforcement action, which we expect to continue. Any such heightened enforcement activity or new regulations could have a material adverse effect on our business, financial condition and results of operations.

We may fail to set aside adequate reserves for, or otherwise underestimate our liability relating to, pending and threatened claims, with a negative effect on our earnings.

We estimate our potential liability for pending and threatened claims and record reserves when appropriate pursuant to generally accepted accounting principles (GAAP). The process is inherently subject to risk, including the risks that a judge or jury could decide a case contrary to our evaluation of the law or the facts or that a court could change or modify existing law on a particular issue important to the case. Our earnings will be adversely affected if our reserves are not adequate.

The ultimate impact on us of regulatory divergence between the United Kingdom and the European Union remains uncertain.

While regulatory standards remain largely aligned following the UK’s withdrawal from the EU, commonly referred to as “Brexit,” it is possible that future divergence may occur between the UK and EU; therefore, the final impact remains uncertain. In December 2020, the UK and the EU agreed on a trade and cooperation agreement that entered into force on May 1, 2021. While the trade and cooperation agreement covers the general objectives and framework of the relationship between the UK and the EU, it generally does not address the regulation of financial services. Instead, in March 2021, the UK and the EU agreed upon a framework for voluntary regulatory cooperation and dialogue on financial services issues between the parties in a memorandum of understanding, which was signed on June 27, 2023.

Since the UK’s withdrawal from the EU on December 31, 2020, the UK government has embarked on a program of significant regulatory reform. In particular, the recently enacted Financial Services and Markets Act 2023 contains provisions that will eventually repeal all EU rules and regulations relating to financial services that were incorporated into UK law following Brexit. The UK government and the UK financial services regulatory authorities has been consulting on a number of measures that will replace the current EU-based rules and regulations with measures that reflect the particular needs of the UK market and policy objectives of the UK’s regulatory authorities. Consequently, over time it is likely that the rules and regulations relating to financial services will diverge, which may result in additional compliance costs for our UK and EU businesses.

If we fail to comply with legal standards, we could incur liability to our clients or lose clients, which could affect our earnings negatively.

Managing or servicing assets with reasonable prudence in accordance with the terms of governing documents and applicable laws is an important part of our business. Failure to comply with the terms of governing documents and applicable laws, manage adequately the risks or manage appropriately the differing interests often involved in the exercise of fiduciary responsibilities may subject us to liability or cause client dissatisfaction, which may impact negatively our earnings and growth.

Strategic Risks

If we are not able to attract, retain and motivate personnel, our business could be negatively affected.

Our success depends, in large part, on our ability to attract new employees, retain and motivate our existing employees, and continue to compensate our employees competitively. Competition for the best employees in most activities in which we engage can be intense, and there can be no assurance that we will be successful in our efforts to recruit and retain necessary personnel. Factors that affect our ability to attract and retain talented and diverse employees include our compensation and benefits programs, our profitability and our reputation for rewarding and promoting qualified employees. Our ability to attract and retain key executives and other employees may be hindered as a result of existing and potential regulations applicable to incentive compensation and other aspects of our compensation programs. These laws and regulations may not apply in the same manner to all financial institutions and other companies, which therefore may subject us to more restrictions than other institutions and companies with which we compete for talent and may also hinder our ability to compete for talent with other industries. In addition, our current or future approach to in-office and remote work arrangements may not meet the needs or expectations of our current or prospective employees, may not be perceived as favorable as compared to the arrangements offered by competitors and may not be conducive to a collaborative working environment, which could adversely affect our ability to attract, retain and motivate employees. The unexpected loss of services of necessary personnel, both in businesses and corporate functions, could have a material adverse impact on our business because of their skills; knowledge of our markets, operations and clients; years of industry experience; and, in some cases, the difficulty of promptly finding qualified replacement personnel. Similarly, the loss of necessary employees, either individually or as a group, could affect our clients’ perception of our abilities adversely. A competitive labor market may also have the effect of heightening many of these risks.

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If we do not develop and execute strategic plans successfully, our growth may be impacted negatively.

Our growth depends upon successful, consistent development and execution of our business strategies. A failure to develop and execute these strategies may impact growth negatively. A failure to grow organically or to integrate successfully an acquisition could have an adverse effect on our business. The challenges arising from the integration of an acquired business may include preserving valuable relationships with employees, clients, suppliers and other business partners, delivering enhanced products and services, as well as combining accounting, data processing and internal control systems. To the extent we enter into transactions to acquire complementary businesses and/or technologies, we may not achieve the expected benefits of such transactions, which could result in increased costs, lowered revenues, ineffective deployment of capital, regulatory concerns, exit costs or diminished competitive position or reputation. These risks may be increased if the acquired company operates internationally or in a geographic location where we do not already have significant business operations.

Execution of our business strategies also may require certain regulatory approvals or consents, which may include approvals of the Federal Reserve Board and other domestic and non-U.S. regulatory authorities. These regulatory authorities have the ability to impose conditions on the activities or transactions contemplated by our business strategies which may impact negatively our ability to realize fully the expected benefits of certain opportunities. Further, acquisitions we announce may not be completed, or completed in the time frame anticipated, if we do not receive the required regulatory approvals, if regulatory approvals are significantly delayed or if other closing conditions are not satisfied.

We are subject to intense competition in all aspects of our businesses, which could have a negative effect on our ability to maintain satisfactory prices and grow our earnings.

We provide a broad range of financial products and services in highly competitive markets. We compete against large, well-capitalized, and geographically diverse companies that are capable of offering a wide array of financial products and services at competitive prices. In certain businesses, such as foreign exchange trading, electronic networks present a competitive challenge. Additionally, technological advances and the growth of internet-based commerce have made it possible for other types of institutions to offer a variety of products and services competitive with certain areas of our business. Many of these nontraditional service providers have fewer regulatory constraints and some have lower cost structures. The same may be said for competitors based in non-U.S. jurisdictions, where legal and regulatory environments may be more favorable than those applicable to the Corporation and the Bank as U.S.-domiciled financial institutions. These competitive pressures may have a negative effect on our earnings and ability to grow. Pricing pressures, as a result of the willingness of competitors to offer comparable or improved products or services at a lower price, also may result in a reduction in the price we can charge for our products and services, which could have, and in some cases has had, a negative effect on our ability to maintain or increase our profitability.

Damage to our reputation could have a direct and negative effect on our ability to compete, grow and generate revenue.

Our ability to compete effectively, to attract and retain clients and employees, and to grow our business is dependent on maintaining our reputation. Damage to our reputation can therefore cause significant harm to our business and prospects, and can arise from various sources, including, among others, the failure or perceived failure to meet or appropriately address client expectations or fiduciary or other obligations; operational failures; legal and regulatory requirements; potential conflicts of interest; data privacy and security; social and sustainability concerns related to our business activities; or any other of the risks discussed in this Item 1A. Additionally, the actual or alleged actions of our affiliates, vendors or other third parties with which we do business, the actual or alleged actions or statements of our employees or adverse publicity could negatively impact our reputation and significantly harm our business prospects. Damage to our reputation for delivery of a high level of service could undermine the confidence of clients and prospects in our ability to serve them and accordingly affect our earnings negatively. Damage to our reputation also could affect the confidence of rating agencies, regulators, stockholders and other parties in a wide range of transactions that are important to our business and the performance of our common stock. Failure to maintain our reputation ultimately could have an adverse effect on our ability to manage our balance sheet or grow our business. Actions by the financial services industry generally or by other members of or individuals in the financial services industry also could impact our reputation negatively or lead to a general loss of confidence in, or impact market perception of, financial institutions that could negatively affect us.

Our reputation may be significantly damaged by adverse publicity or negative information regarding the Corporation and the Bank, whether true or not, that may be published or broadcast by the media or posted on social media, non-mainstream news services or other parts of the internet. The proliferation of social media channels utilized by us and third parties, as well as the personal use of social media by our employees and others, may increase the risk of negative publicity, including through the rapid dissemination of inaccurate, misleading or false information, which could harm our reputation or have other negative consequences. Furthermore, ESG-related issues have been the subject of increased focus by regulators and stakeholders, including outside the U.S., and particularly in Europe. Any inability to meet applicable requirements or expectations, including those from conflicting U.S. and non-U.S. global expectations, may adversely

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impact our reputation. Additionally, various stakeholders have divergent views on ESG-related matters, including in the countries in which we operate and invest, as well as states and localities where we serve public sector clients. In the case of proxy voting, there is the inherent risk of misalignment between the proxy votes we cast on behalf of clients and all of our clients’ values and preferences. This divergence increases the risk that any action or lack thereof by us on such matters will be perceived negatively by some stakeholders and could adversely impact our reputation and business.

We need to invest in innovation constantly, and the inability or failure to do so may affect our businesses and earnings negatively.

Our success in the competitive environment in which we operate requires consistent investment of capital and human resources in innovation, particularly in light of the current “FinTech” environment, in which the financial services industry is undergoing rapid technological changes and financial institutions are investing significantly in evaluating new technologies, such as artificial intelligence, machine learning, blockchain and other distributed ledger technologies, and developing potentially industry-changing new products, services and industry standards. Our investment is directed at generating new products and services, and adapting existing products and services to the evolving standards and demands of the marketplace. Among other things, investing in innovation helps us maintain a mix of products and services that keeps pace with our competitors and achieve acceptable margins. Our investment also focuses on enhancing the delivery of our products and services in order to compete successfully for new clients or gain additional business from existing clients. Effectively identifying gaps or weaknesses in our product offerings is important to our success. Failure to keep pace with our competition in any of these areas could affect our business opportunities, growth and earnings adversely. There are substantial risks and uncertainties associated with innovation efforts, including an increased risk that new and emerging technologies may expose us to increased data privacy and security and other information technology threats. We must invest significant time and resources in developing and marketing new products and services, and expected timetables for the introduction and development of new products or services may not be achieved and price and profitability targets may not be met. Further, our revenues and costs may fluctuate because new products and services generally require start-up costs while corresponding revenues take time to develop or may not develop at all.

Failure to understand or appreciate fully the risks associated with development or delivery of new product and service offerings may affect our businesses and earnings negatively.

The success of our innovation efforts depends, in part, on the successful implementation of new product and service initiatives. Not only must we keep pace with competitors in the development of these new offerings, but we must accurately price them (as well as existing products) on a risk-adjusted basis and deliver them to clients effectively. Our identification of risks arising from new products and services, both in their design and implementation, and effective responses to those identified risks, including pricing, is key to the success of our efforts at innovation and investment in new product and service offerings.

Our success with large, complex clients requires an understanding of the market and legal, regulatory and accounting standards in various jurisdictions.

A significant portion of our business involves providing certain services to large, complex clients which requires an understanding of the market and legal, regulatory and accounting standards in various jurisdictions. Any failure to understand, address or comply with those standards appropriately could affect our growth prospects or affect our reputation negatively. We identify and manage risk through our business strategies and plans and our risk management practices and controls. If we fail to identify and manage significant risks successfully, we could incur financial loss, suffer damage to our reputation that could restrict our ability to grow or conduct business profitably, or become subject to regulatory penalties or constraints that could limit some of our activities or make them significantly more expensive. In addition, our businesses and the markets in which we operate are continuously evolving. We may fail to understand fully the implications of changes in legal or regulatory requirements, our businesses or the financial markets or fail to enhance our risk framework to address those changes in a timely fashion. If our risk framework is ineffective, either because it fails to keep pace with changes in the financial markets, legal and regulatory requirements, our businesses, our counterparties, clients or service providers or for other reasons, we could incur losses, suffer reputational damage or find ourselves out of compliance with applicable regulatory or contractual mandates or expectations. These risks are magnified as client requirements become more complex and as our increasingly global business requires end-to-end management of operational and other processes across multiple time zones and many inter-related products and services.

We may take actions to maintain client satisfaction that result in losses or reduced earnings.

We may take action or incur expenses in order to maintain client satisfaction or preserve the usefulness of investments or investment vehicles we manage in light of changes in security ratings, liquidity or valuation issues or other developments, even though we are not required to do so by law or the terms of governing instruments. The risk that we will decide to take actions to maintain client satisfaction that result in losses or reduced earnings is greater in periods when credit or equity markets are deteriorating in value or are particularly volatile and liquidity in markets is disrupted.

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Our operations, businesses and clients could be materially adversely affected by the effects of climate change or concerns related thereto.

Risks related to climate change may impact our business, financial condition, and results of operations adversely. The physical risks of climate change include rising average global temperatures, rising sea levels, and an increase in the frequency and severity of extreme weather events and natural disasters. Such developments could disrupt our operations and resilience capabilities, those of our clients, or third parties on which we rely. Further, the consequences of climate change could negatively impact our clients’ ability to pay outstanding loans, reduce the value of collateral, or result in insurance shortfalls.

Climate change could also result in transition risk arising from changes in policy, regulations, technology, business practices or market preferences toward a lower-carbon economy which could adversely impact us or our clients. These impacts could result in increased operational or compliance costs, higher energy expenses, additional taxes, and the devaluation of assets.

Our reputation and business prospects may also be damaged if we do not, or are perceived not to, effectively prepare for the potential business and operational opportunities and risks associated with climate change, including through the development and marketing of effective and competitive new products and services designed to address our clients’ climate risk-related needs. We also face regulatory and liability risk associated with greenwashing claims, a failure to execute on our public climate-related commitments, or by association with individuals, entities, industries or products that may be inconsistent with our stated positions on climate change issues. At the same time, certain financial institutions have also been subject to significant scrutiny by regulatory agencies and government officials and other criticism and negative publicity as a result of their decisions to reduce their involvement in certain industries or projects perceived to be associated with climate change. If we do not identify, quantify, and mitigate such risks successfully, we may experience financial losses, litigation, reputational harm, and losses of investor and stakeholder confidence.

Even as regulators begin to mandate additional disclosure of climate-related information by companies across sectors, methodologies and data used to conduct more robust climate-related risk analyses are still in development. Third‑party exposures, emissions, climate-related risks, and other data are limited in availability and variable in quality. Modeling capabilities across the industry to analyze climate-related risks and interconnections are improving but remain imperfect. These legislative and regulatory uncertainties along with inconsistencies and conflicts of policy across jurisdictions, and changes regarding climate-related risk management and disclosures are likely to result in higher regulatory, compliance, credit, reputational and other risks and costs.

Other Risks

The systems and models we employ to analyze, monitor and mitigate risks, as well as for other business purposes, are inherently limited, may not be effective in all cases and, in any case, cannot eliminate all risks that we face.

We use various systems and models in analyzing and monitoring several risk categories, as well as for other business purposes. While we assess and improve these systems and models on an ongoing basis, there can be no assurance that they, along with other related controls, will effectively mitigate risk under all circumstances, or that they will adequately mitigate any risk or loss to us. As with any systems and models, there are inherent limitations because they involve techniques and judgments that cannot anticipate every economic and financial outcome in the markets in which we operate, nor can they anticipate the specifics and timing of such outcomes. Further, these systems and models may fail to quantify accurately the magnitude of the risks we face or they may not be effective against all types of risk, including risks that are unidentified or unanticipated. Our measurement methodologies rely on many assumptions and historical analyses and correlations. These assumptions may be incorrect, and the historical correlations on which we rely may not continue to be relevant. Models based on historical data sets might not be accurate predicators of future outcomes and their ability to appropriately predict future outcomes may degrade over time due to limited historical patterns, extreme or unanticipated market movements or customer behavior and liquidity, especially during severe market downturns or stress events (e.g., geopolitical or pandemic events). Consequently, the measurements that we make may not adequately capture or express the true risk profiles of our businesses or provide accurate data for other business purposes, each of which ultimately could have a negative impact on our business, financial condition and results of operations. Errors in the underlying model or model assumptions, or inadequate model assumptions, could result in unanticipated and adverse consequences, including material loss or noncompliance with regulatory requirements or expectations.

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Changes in tax laws and interpretations and challenges to our tax positions may affect our earnings negatively.

Both U.S. and non-U.S. governments and tax authorities, including states and municipalities, from time to time issue new, or modify existing, tax laws and regulations. These authorities may also issue new, or modify existing, interpretations of those laws and regulations. These new laws, regulations or interpretations, and our actions taken in response to, or reliance upon, such changes in the tax laws may impact our tax position in a manner that affects our earnings negatively.

In the course of our business, we are sometimes subject to challenges from U.S. and non-U.S. tax authorities, including states and municipalities, regarding the amount of taxes due. These challenges may result in adjustments to the timing or amount of taxable income, deductions, tax credits, or the allocation of income among tax jurisdictions, all of which may require a greater provision for taxes or otherwise affect earnings negatively.

Changes in accounting standards may be difficult to predict and could have a material impact on our consolidated financial statements.

New accounting standards, changes to existing accounting standards, or changes in the interpretation of existing accounting standards by the Financial Accounting Standards Board, the SEC or bank regulatory agencies, or otherwise reflected in GAAP, potentially could have a material impact on our financial condition and results of operations. These changes are difficult to predict and in some cases we could be required to apply a new or revised standard retroactively, resulting in the revised treatment of certain transactions or activities, or even the restatement of consolidated financial statements for prior periods.

Our ability to return capital to stockholders is subject to the discretion of our Board of Directors and may be limited by U.S. banking laws and regulations, applicable provisions of Delaware law, or our failure to pay full and timely dividends on our preferred stock and the terms of our outstanding debt.

Holders of our common stock are entitled to receive only such dividends and other distributions of capital as our Board of Directors may declare out of funds legally available for such payments under Delaware law. Although we have declared cash dividends on shares of our common stock historically, we are not required to do so. In addition to the approval of our Board of Directors, our ability to take certain actions, including our ability to pay dividends, repurchase stock, and make other capital distributions, is dependent upon, among other things, their payment being made in accordance with the capital plan rules and capital adequacy standards of the Federal Reserve Board.

A significant source of funds for the Corporation is dividends from the Bank. As a result, our ability to pay dividends on the Corporation’s common stock will depend in large part on the ability of the Bank to pay dividends to the Corporation. There are various legal limitations on the extent to which the Bank and the Corporation’s other subsidiaries can supply funds to the Corporation by dividend or otherwise. Dividend payments by the Bank to the Corporation in the future will require continued generation of earnings by the Bank and could require regulatory approval under certain circumstances. If the Bank is unable to pay dividends to the Corporation in the future, our ability to pay dividends on the Corporation’s common stock would be affected adversely.

Our ability to declare or pay dividends on, or purchase, redeem or otherwise acquire, shares of our common stock or any of our shares that rank junior to our preferred stock as to the payment of dividends and/or the distribution of any assets on any liquidation, dissolution or winding-up of the Corporation also generally will be prohibited in the event that we do not declare and pay in full dividends on our Series D Non-Cumulative Perpetual Preferred Stock (Series D Preferred Stock) and Series E Non-Cumulative Perpetual Preferred Stock (Series E Preferred Stock). Further, in the future if we default on certain of our outstanding debt we will be prohibited from making dividend payments on our common stock until such payments have been brought current.

Any reduction or elimination of our common stock dividend, or even our failure to maintain the common stock dividend level in a manner comparable to our competitors, likely would have a negative effect on the market price of our common stock. For more information on dividend restrictions, see “Supervision and Regulation—Payment of Dividends” and “Supervision and Regulation—Capital Planning and Stress Testing” in Item 1, “Business.”

Additionally, on October 19, 2021, we announced that our Board authorized a share repurchase program to repurchase up to 25.0 million shares of the Corporation’s outstanding common stock. The Corporation retains the ability to repurchase when circumstances warrant and applicable regulation permits. The Inflation Reduction Act of 2022, imposes a 1% excise tax on the fair market value of stock repurchases after December 31, 2022. There have been recent proposals to significantly increase this excise tax rate. Any such material increases may impact our future strategies relating to the return of capital to our shareholders, including the size of, or execution against, current or future repurchase programs related to shares of our common stock.

ITEM 1B – UNRESOLVED STAFF COMMENTS

None.

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ITEM 1C – CYBERSECURITY

Northern Trust understands the importance of managing cybersecurity risk to ensure the safety and security of our data and systems. The Business Risk Committee of the Board of Directors (Business Risk Committee), which reports regularly to the Board, oversees management’s actions to identify, assess, mitigate and remediate material issues related to cybersecurity and technology risk as part of our enterprise risk management program and processes. The Cybersecurity Risk Oversight Subcommittee, chaired by the former chief information officer and chief transformation officer of a Fortune 50 company, assists the Business Risk Committee in discharging its oversight duties with respect to cybersecurity risk and meets on a regular basis to provide for an even deeper focus on, and governance framework around, cybersecurity risks inherent in the Corporation’s business. The Business Risk Committee, Cybersecurity Risk Oversight Subcommittee, and the Board are regularly briefed on the organization’s cybersecurity posture by senior management, including the Chief Executive Officer, Chief Information Officer (CIO), Chief Risk Officer, Head of Non-Financial Risk and Chief Information Risk Officer (CIRO), and Chief Information Security Officer (CISO). The CISO, a Certified Information Systems Security Professional (CISSP) with nearly 30 years of relevant experience, reports to the CIO and is responsible for identifying, managing, and, if necessary, remediating cybersecurity risk to ensure the protection of our data, network, and systems. The primary management-level committees responsible for assessing and managing cybersecurity risk are the Information Technology Oversight Committee, chaired by the CIO, who has over 20 years of experience in technology leadership roles, and the Information Technology Risk Committee, chaired by the CIRO, who has over 20 years of cybersecurity and risk management experience.

Effective management of risks related to the confidentiality, integrity, and availability of information is crucial in an environment of increasing cybersecurity threats and requires a structured approach to establish and communicate expectations and required practices. Northern Trust’s cybersecurity and technology risk management program provides the overall structure for managing the respective risks in a sustainable manner supported by an organizational structure that reflects support from executive management and includes risk committees comprised of members from across the business. The program is supported by the Cyber and Technology Risk Management Policy and Framework approved by the Business Risk Committee. The Cyber and Technology Risk Management Policy and Framework are based on the National Institute of Standards and Technology (NIST) Cybersecurity Framework and provide a comprehensive overview of cybersecurity and technology risk management governance activities pertaining to the confidentiality of information, integrity of systems, data and processes, and the availability of business functions that may be adversely impacted. These governance processes, internal controls, and risk management practices, which are part of our enterprise risk management program and processes, are designed to keep risk at levels appropriate to Northern Trust’s overall risk appetite and the inherent risk in the markets in which Northern Trust operates. Northern Trust employees are responsible for promoting cybersecurity as well as adhering to applicable policies and standards to safeguard data and business systems. In cases where Northern Trust relies on vendors to perform services, controls are routinely reviewed for alignment with industry standards and their ability to protect information. Any findings identified are remediated following a risk-based approach.

In addition to the cybersecurity controls managed and monitored within the organization, Northern Trust uses external third-party security teams on a regular basis to assess effectiveness of our cybersecurity program and controls. These teams perform program maturity assessments, penetration tests, security assessments, and reviews of Northern Trust’s vulnerability to cyber-attacks. Northern Trust also operates a global security operations center for threat identification and response. This center aggregates security threat information from systems and platforms across the business and alerts the organization in accordance with its documented Cybersecurity Incident Response Plan.    

The Cybersecurity Incident Response Plan was developed to respond to cybersecurity incidents. A cybersecurity incident can include, but is not limited to, disruptions of service, denials-of-service, compromises of information systems, data exfiltration or data corruption. The plan provides a streamlined approach that can be invoked rapidly to address matters that raise enterprise concern and to communicate impact, actions, and status to senior management, including the CISO, CIRO, and appropriate stakeholders. The plan design includes enterprise-level response plans, including escalation to appropriate Board-level governance committees, and is reviewed, tested, and updated regularly.

Northern Trust’s disclosure procedures and controls also address cybersecurity incidents and include elements to ensure an analysis of potential disclosure obligations arising from any such incidents. Northern Trust maintains compliance programs to address the applicability of restrictions on securities trading while in possession of material, nonpublic information, including instances in which such information may relate to cybersecurity incidents.

Northern Trust also maintains a comprehensive Information and Cyber Security Training and Awareness practice providing baseline and targeted education and awareness for employees and contractors. This program includes at least one required annual online training class for all employees and contractors, supplemental refresher training throughout the year, targeted training based on roles and risk levels, multiple simulated phishing and vishing attacks with associated training, the distribution of regular cybersecurity awareness materials, and the designation of individuals as Information Security and Privacy champions within the businesses.

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To date, Northern Trust has not identified any cybersecurity threats or incidents that have materially affected or are reasonably likely to materially affect our business strategy, results of operations, or financial condition. However, despite our efforts, we cannot eliminate all risks from cybersecurity threats or incidents, or provide assurances that we have not experienced an undetected cybersecurity threat or incident. For more information about these risks, see, “Breaches of our security measures, including, but not limited to, those resulting from cyber-attacks or other information security incidents, may result in losses,” in Item 1A, “Risk Factors.”

ITEM 2 – PROPERTIES

The executive offices of the Corporation and the Bank are located at 50 South La Salle Street in Chicago. This Bank-owned building is occupied by various divisions of Northern Trust’s businesses. Adjacent to this building is one office building in which the Bank leases space principally for corporate support functions. Financial services are provided by the Bank and other subsidiaries of the Corporation through a network of offices in 24 U.S. states and Washington, D.C., and across 22 locations in Canada, Europe, the Middle East and the Asia-Pacific region. The majority of those offices are leased. The Bank’s other primary U.S. operations are located in five facilities: a leased facility at 333 South Wabash Avenue in Chicago; a leased facility in Tempe, Arizona; and one leased and two Bank-owned supplementary operations/data center buildings located in the western suburbs of Chicago. A majority of the Bank’s London-based staff is located at a leased facility at Canary Wharf in London. Additional support and operations activity originates from four facilities in India, one facility in Ireland, and one facility in the Philippines, all of which are leased. The Bank and the Corporation’s other subsidiaries operate from various other facilities in North America, Europe, the Asia-Pacific region, and the Middle East, most of which are leased.

The Corporation believes that its owned and leased facilities are suitable and adequate for its business needs. The Corporation continues to evaluate its owned and leased facilities and may determine from time to time that certain of its facilities are no longer necessary for its operations. There is no assurance that the Corporation will be able to dispose of any excess facilities or that it will not incur costs in connection with such dispositions, which could be material to its operating results in a given period.

For additional information relating to properties and lease commitments, refer to Note 8, “Buildings and Equipment” and Note 9, “Lease Commitments,” included under Item 8, “Financial Statements and Supplementary Data,” and which information is incorporated herein by reference.

ITEM 3 – LEGAL PROCEEDINGS

The information presented under the caption “Legal Proceedings” in Note 24, “Commitments and Contingent Liabilities,” included under Item 8, “Financial Statements and Supplementary Data,” is incorporated herein by reference.

ITEM 4 – MINE SAFETY DISCLOSURES

Not applicable.

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SUPPLEMENTAL ITEM – INFORMATION ABOUT OUR EXECUTIVE OFFICERS

The following sets forth certain information with regard to each executive officer of the Corporation.

Michael G. O’Grady - Mr. O’Grady, age 58, joined Northern Trust in 2011 and has served as Chairman of the Board since 2019, as Chief Executive Officer since 2018 and as President since 2017. Prior to that, Mr. O’Grady served as Executive Vice President and President of Corporate & Institutional Services from 2014 to 2016 and as Chief Financial Officer from 2011 to 2014. Before joining Northern Trust, Mr. O’Grady served as a Managing Director in Bank of America Merrill Lynch’s Investment Banking Group.

Peter B. Cherecwich - Mr. Cherecwich, age 59, joined Northern Trust in 2007 and has served as Executive Vice President and President of Asset Servicing since 2017. Prior to that, Mr. Cherecwich served as Executive Vice President and President of Global Fund Services from 2010 to 2017 and as Chief Operating Officer of Corporate & Institutional Services from 2008 to 2014. From 2007 to 2008, he served as Head of Institutional Strategy & Product Development. Before joining Northern Trust, Mr. Cherecwich served in several executive and operational roles at State Street Corporation.

Daniel E. Gamba - Mr. Gamba, age 56, joined Northern Trust as Executive Vice President and President of Asset Management in April 2023. Before joining Northern Trust, Mr. Gamba spent over two decades at Blackrock, Inc., where he served as Co-Head of Fundamental Equities from 2020 to February 2023, as Global Head of Active Equity Product Strategy from 2016 to 2020, and as Head of Americas Institutional iShares Business and Co-Head iShares U.S. from 2011 to 2016. Prior to that, Mr. Gamba served in various executive roles at Blackrock, Inc.

Steven L. Fradkin - Mr. Fradkin, age 62, joined Northern Trust in 1985 and has served as Executive Vice President and President of Wealth Management since 2014. Prior to that, Mr. Fradkin served as President of Corporate & Institutional Services from 2009 to 2014. From 2004 to 2009, he served as Chief Financial Officer.

Mark C. Gossett - Mr. Gossett, age 62, joined Northern Trust in 1983 and has served as Executive Vice President and Chief Risk Officer since 2020. Prior to that, Mr. Gossett served as Chief Credit Officer and Head of Market and Liquidity Risk from 2014 to 2020 and as Co-Head of Global Foreign Exchange from 2012 to 2014. Mr. Gossett also previously served as the Chief Risk Officer of Asset Management from 2009 to 2012 and as the Chief Operating Officer of Asset Management from 2005 to 2009.

Jane B. Karpinski - Ms. Karpinski, age 61, joined Northern Trust in 2006 and has served as Executive Vice President since 2016 and as Global Head of Regulatory Affairs since December 2023. Ms. Karpinski previously served as Chief Audit Executive from 2017 to December 2023, and as Controller from 2013 to 2017. Prior to that, she served as International Chief Financial Officer from 2012 to 2013, and as Chief Financial Officer for Europe, Middle East and Africa from 2007 to 2012.

John P. Landers - Mr. Landers, age 51, joined Northern Trust in 2003 and has served as a Senior Vice President and as Controller since December 2023. Mr. Landers previously served as Chief Productivity Officer from January 2023 to December 2023 and as Chief Financial Officer of Asset Servicing from September 2015 to January 2023.

Susan C. Levy - Ms. Levy, age 66, joined Northern Trust in 2014 and has served as Executive Vice President and General Counsel since that time. Ms. Levy also previously served as Corporate Secretary from 2018 to 2021. Before joining Northern Trust, Ms. Levy served as Managing Partner of the law firm Jenner & Block from 2008 to 2014, where she was a partner since 1990.

Teresa A. Parker - Ms. Parker, age 63, joined Northern Trust in 1982 and has served as Executive Vice President and President of Europe, Middle East and Africa since 2017. Prior to that, Ms. Parker served as Chief Operating Officer of Corporate & Institutional Services from 2014 to 2017. From 2009 to 2014, she served as Executive Vice President, Corporate & Institutional Services for the Asia-Pacific region.

Thomas A. South - Mr. South, age 54, joined Northern Trust in 1999 and has served as Executive Vice President and Chief Information Officer since 2018. Prior to that, Mr. South served as Chief Business Architect from 2014 to 2018 and as Chief Operating Officer of Operations & Technology from 2013 to 2014.

Alexandria Taylor - Ms. Taylor, age 41, joined Northern Trust as Executive Vice President and Chief Human Resources Officer in 2022. Prior to joining Northern Trust, Ms. Taylor spent nearly two decades at Bank of America based in New York City where she was the head of Human Resources for corporate, institutional and wealth management businesses. She also oversaw the team responsible for Global Human Resources regulatory relations. Prior to that, Ms. Taylor held positions of increasing responsibility and complexity at Bank of America.

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 35

Jason J. Tyler - Mr. Tyler, age 52, joined Northern Trust in 2011 and has served as Executive Vice President and Chief Financial Officer since 2020. Prior to that, Mr. Tyler served as Chief Financial Officer of Wealth Management from 2018 to 2019, as Global Head of Asset Management’s Institutional Group from 2014 to 2018, and as Global Head of Strategy from 2011 to 2014. Before joining Northern Trust, Mr. Tyler served in certain executive and operational roles at Ariel Investments and Bank One/American National Bank.

All officers are appointed annually by the Board of Directors. Officers continue to hold office until their successors are duly elected or until their death, resignation or removal by the Board.

36 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

PART II

ITEM 5 – MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

Our common stock is listed on The NASDAQ Stock Market LLC under the symbol “NTRS.” There were 1,474 stockholders of record as of January 31, 2024. The following table shows certain information relating to the Corporation’s purchases of common stock for the three months ended December 31, 2023.

TABLE 3: REPURCHASES OF COMMON STOCK IN THE FOURTH QUARTER OF 2023

PERIOD	TOTAL NUMBER OF SHARES PURCHASED	AVERAGE PRICE PAID PER SHARE		TOTAL NUMBER OF SHARES PURCHASED AS PART OF A PUBLICLY ANNOUNCED PLAN	MAXIMUM NUMBER OF SHARES THAT MAY YET BE PURCHASED UNDER THE PLAN
October 1 - 31, 2023	316,100	$	64.51	316,100	22,613,252
November 1 - 30, 2023	1,010,300	74.21		1,010,300	21,602,952
December 1 - 31, 2023	609,500	80.68		609,500	20,993,452
Total (Fourth Quarter)	1,935,900	$	74.66	1,935,900	20,993,452

On October 19, 2021, the Corporation announced a share repurchase program under which the Corporation’s Board of Directors authorized the Corporation to repurchase up to 25.0 million shares of the Corporation’s common stock. The repurchase authorization approved by the Board of Directors has no expiration date, thus the Corporation retains the ability to repurchase when circumstances warrant and applicable regulation permits. For more information, please refer to Note 13, “Stockholders’ Equity,” provided in Item 8, “Financial Statements and Supplementary Data.”

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 37

COMPARISON OF FIVE-YEAR CUMULATIVE TOTAL RETURN

The following graph compares the cumulative total stockholder return on the Corporation’s common stock to the cumulative total return of the S&P 500 Index and the KBW Bank Index for the five fiscal years ended December 31, 2023. The cumulative total stockholder return assumes the investment of $100 in the Corporation’s common stock and in each index on December 31, 2018 and assumes reinvestment of dividends. The KBW Bank Index is a modified-capitalization-weighted index made up of 24 of the largest banking companies in the United States. The Corporation is included in the S&P 500 Index and the KBW Bank Index.

Total Return Assumes $100 Invested on December 31, 2018 with Reinvestment of Dividends

	DECEMBER 31,
	2018		2019		2020		2021		2022		2023
Northern Trust	$	100	$	131	$	119	$	156	$	119	$	118
S&P 500 Index	100		131		156		200		164		207
KBW Bank Index	100		136		122		169		133		132

ITEM 6 – [RESERVED]

38 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

ITEM 7 – MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following is management’s discussion and analysis of the financial condition and results of operations (MD&A) of Northern Trust Corporation (Corporation) for the year ended December 31, 2023. The following should be read in conjunction with the consolidated financial statements and related footnotes included in this report. Investors also should read the section entitled “Forward-Looking Statements.”

BUSINESS OVERVIEW

The Corporation is a leading provider of wealth management, asset servicing, asset management and banking solutions to corporations, institutions, families and individuals. The Corporation focuses on managing and servicing client assets through its two client-focused reporting segments: Asset Servicing and Wealth Management. Asset management and related services are provided to Asset Servicing and Wealth Management clients primarily by the Asset Management business.

The Corporation conducts business through various U.S. and non-U.S. subsidiaries, including The Northern Trust Company (the Bank). The Corporation was formed as a holding company for the Bank in 1971. The Corporation has a global presence with offices in 24 U.S. states and Washington, D.C., and across 22 locations in Canada, Europe, the Middle East and the Asia-Pacific region. Except where the context requires otherwise, the terms “Northern Trust,” “we,” “us,” “our,” “its,” or similar terms refers to the Corporation and its subsidiaries on a consolidated basis.

FINANCIAL OVERVIEW

TABLE 4: FINANCIAL HIGHLIGHTS

	FOR THE YEAR ENDED DECEMBER 31,
($ In Millions)	2023			2022			2021
Noninterest Income	$	4,791.5		$	4,874.0		$	5,081.8
Net Interest Income	1,982.0			1,887.2			1,382.7
Total Revenue	$	6,773.5		$	6,761.2		$	6,464.5
Provision for Credit Losses	24.5			12.0			(81.5)
Noninterest Expense	5,284.2			4,982.9			4,535.9
Income before Income Taxes	$	1,464.8		$	1,766.3		$	2,010.1
Provision for Income Taxes	357.5			430.3			464.8
Net Income	$	1,107.3		$	1,336.0		$	1,545.3
Preferred Stock Dividends	41.8			41.8			41.8
Net Income Applicable to Common Stock	$	1,065.5		$	1,294.2		$	1,503.5
PER COMMON SHARE
Net Income – Basic	$	5.09		$	6.16		$	7.16
– Diluted	5.08			6.14			7.14
Cash Dividends Declared Per Common Share	3.00			2.90			2.80
Book Value – End of Period (EOP)	53.69			49.78			53.58
Market Price – EOP	84.38			88.49			119.61
SELECTED RATIOS AND METRICS
Return on Average Common Equity	10.0		%	12.7		%	13.9		%
Return on Average Assets	0.78			0.88			0.99
Dividend Payout Ratio	59.1			47.2			39.2
Average Stockholders’ Equity to Average Assets	8.1			7.3			7.5

Net Income decreased $228.7 million, or 17%, to $1.11 billion in 2023 from $1.34 billion in 2022. Earnings per diluted common share was $5.08 in 2023 compared to $6.14 in 2022. Return on average common equity decreased to 10.0% in 2023 from 12.7% in 2022. Trust, Investment and Other Servicing Fees decreased 2% in 2023, as compared to a 2% increase in 2022.

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 39

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Revenue increased $12.3 million to $6.77 billion in 2023 from $6.76 billion in the prior year, primarily driven by an increase in Net Interest Income of 5%, partially offset by a decrease in Foreign Exchange Trading Income of 29%.

Client AUC/A increased 13% from $13.60 trillion as of December 31, 2022 to $15.40 trillion as of December 31, 2023, primarily reflecting favorable markets. Client assets under custody, a component of AUC/A, increased 12% from $10.60 trillion as of December 31, 2022 to $11.92 trillion as of December 31, 2023. Client assets under custody included $8.01 trillion of global custody assets as of December 31, 2023, which increased 16% from $6.91 trillion as of December 31, 2022. Client AUM increased 15% to $1.43 trillion as of December 31, 2023 from $1.25 trillion as of December 31, 2022. The increase primarily reflected favorable markets, net inflows, and favorable currency translation.

The Provision for Credit Losses in 2023 was $24.5 million as compared to a Provision for Credit Losses of $12.0 million in 2022. For additional information, please refer to Provision for Credit Losses within the “Consolidated Results of Operations” section.

Noninterest Expense of $5.28 billion in 2023 increased $301.3 million, or 6%, from $4.98 billion in 2022, primarily reflecting increased Other Operating Expense, Equipment and Software, and Compensation. Please refer to Note 19, “Other Operating Expense” included under Item 8, “Financial Statements and Supplementary Data,” for additional details related to the $84.6 million FDIC special assessment.

The Provision for Income Taxes in 2023 totaled $357.5 million, representing an effective tax rate of 24.4%. The Provision for Income Taxes in 2022 totaled $430.3 million, representing an effective tax rate of 24.4%.

Northern Trust continued to maintain a strong capital position during 2023, with all capital ratios exceeding those required for classification as “well-capitalized” under federal bank regulatory capital requirements. For additional information, please refer to the “Capital Management” section.

CONSOLIDATED RESULTS OF OPERATIONS

The following information summarizes our consolidated results of operations for 2023 compared to 2022. For a discussion related to the consolidated results of operations for 2022 compared to 2021, refer to Part II, Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” in our Annual Report on Form 10-K for the year ended December 31, 2022 (2022 Form 10-K), which was filed with the United States Securities and Exchange Commission on February 28, 2023.

Revenue

Northern Trust generates the majority of its revenue from Noninterest Income that primarily consists of Trust, Investment and Other Servicing Fees. Net Interest Income comprises the remainder of revenue and consists of Interest Income generated by earning assets, net of Interest Expense on deposits and borrowed funds.

Revenue in 2023 of $6.77 billion increased $12.3 million from $6.76 billion in 2022. Noninterest Income represented 71% and 72% of total revenue in 2023 and 2022, respectively, and totaled $4.79 billion in 2023, which decreased $82.5 million, or 2%, from $4.87 billion in 2022.

Noninterest Income in 2023 decreased primarily due to lower Foreign Exchange Trading Income and lower Trust, Investment and Other Servicing Fees, partially offset by lower investment securities losses compared to the prior year and higher Other Operating Income. Investment Security Gains (Losses), net reflected $169.5 million of losses in 2023 as compared to $214.0 million of losses in 2022. Both losses in Investment Security Gains (Losses), net in 2023 and 2022 were due to a repositioning of the available for sale debt securities portfolio. Other Operating Income of $228.7 million in 2023 increased $37.4 million, or 19%, from $191.3 million in the prior year, primarily due to higher income associated with a market value increase in supplemental compensation plans and higher banking and credit-related services fees. Trust, Investment and Other Servicing Fees of $4.36 billion in 2023 decreased $70.8 million, or 2%, from $4.43 billion in 2022, primarily due to net asset outflows and unfavorable markets, partially offset by lower money market fee waivers and favorable currency translation.

Net Interest Income on a fully taxable equivalent (FTE) basis in 2023 of $2.04 billion increased $106.7 million, or 6%, from $1.93 billion in 2022, primarily due to higher average interest rates, partially offset by an unfavorable balance sheet mix. The net interest margin on an FTE basis increased to 1.56% in 2023 from 1.39% in 2022, primarily due to higher average interest rates, partially offset by an unfavorable funding mix shift. Average earning assets decreased $8.0 billion, or 6%, from $138.8 billion in 2022 to $130.8 billion in 2023, primarily due to lower client deposits, partially offset by higher borrowing activity, the net of which resulted in lower funding of earning assets.

40 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Additional information regarding Northern Trust’s revenue by type is provided in the following table.

TABLE 5: REVENUE

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Noninterest Income
Trust, Investment and Other Servicing Fees	$	4,361.8	$	4,432.6	$	4,361.1
Foreign Exchange Trading Income	203.9		288.6		292.6
Treasury Management Fees	31.6		39.3		44.3
Security Commissions and Trading Income	135.0		136.2		140.2
Other Operating Income	228.7		191.3		243.9
Investment Security Gains (Losses), net	(169.5)		(214.0)		(0.3)
Total Noninterest Income	$	4,791.5	$	4,874.0	$	5,081.8
Net Interest Income(1)	1,982.0		1,887.2		1,382.7
Total Revenue	$	6,773.5	$	6,761.2	$	6,464.5

(1) Net Interest Income stated on a GAAP basis. Net Interest Income on an FTE basis includes FTE adjustments of $57.5 million, $45.6 million, and $35.6 million for 2023, 2022, and 2021, respectively. A reconciliation of total consolidated revenue, Net Interest Income and net interest margin on a GAAP basis to revenue, Net Interest Income and net interest margin on an FTE basis, respectively, (each of which is a non-GAAP financial measure) is provided in “Supplemental Information—Reconciliation to Fully Taxable Equivalent” within this “Management’s Discussion and Analysis of Financial Condition and Results of Operations” section.

Trust, Investment and Other Servicing Fees

Trust, Investment and Other Servicing Fees were $4.36 billion in 2023 compared with $4.43 billion in 2022, and are based primarily on the market value of assets held in custody, managed or serviced; the volume of transactions; securities lending volume and spreads; and fees for other services rendered. Certain market value calculations on which fees are based are performed on a monthly or quarterly basis in arrears.

Northern Trust voluntarily waived $8.8 million of money market fund fees in 2023 and $64.2 million of money market fund fees in 2022.

The components of Trust, Investment and Other Servicing Fees are provided in the following table.

TABLE 6: TRUST, INVESTMENT AND OTHER SERVICING FEES

	FOR THE YEAR ENDED DECEMBER 31,						CHANGE
($ In Millions)	2023		2022		2021		2023 / 2022		2022 / 2021
Asset Servicing Trust, Investment and Other Servicing Fees
Custody and Fund Administration	$	1,689.5	$	1,700.1	$	1,818.8	(1)	%	(7)	%
Investment Management	528.1		555.1		443.5		(5)		25
Securities Lending	83.0		81.4		76.7		2		6
Other	161.3		159.7		148.3		1		8
Total Asset Servicing Trust, Investment and Other Servicing Fees	$	2,461.9	$	2,496.3	$	2,487.3	(1)	%	—	%
Wealth Management Trust, Investment and Other Servicing Fees
Central	$	673.8	$	692.6	$	698.7	(3)	%	(1)	%
East	491.5		504.0		509.3		(2)		(1)
West	378.0		382.1		380.2		(1)		—
Global Family Office	356.6		357.6		285.6		—		25
Total Wealth Management Trust, Investment and Other Servicing Fees	$	1,899.9	$	1,936.3	$	1,873.8	(2)	%	3	%
Total Consolidated Trust, Investment and Other Servicing Fees	$	4,361.8	$	4,432.6	$	4,361.1	(2)	%	2	%

Asset Servicing

Asset Servicing Trust, Investment and Other Servicing Fees are primarily attributable to services related to custody, fund administration, investment management, and securities lending. Custody and Fund Administration fees, the largest component of Asset Servicing fees, are driven primarily by values of client AUC/A, transaction volumes and the number of accounts. The asset values used to calculate these fees vary depending on the individual fee arrangements negotiated with each client. Custody fees related to asset values are client specific and are priced based on month-end market values, quarter-end market values, or the average of month-end market values for the quarter. The fund administration fees that are asset-value-related are priced using month-end, quarter-end, or average daily balances. Investment Management fees are based generally on market values of client AUM management throughout the period. Typically, the asset values used to calculate fee revenue are based on a one-month or one-quarter lag.

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 41

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Securities Lending revenue is affected by market values; the demand for securities to be lent, which drives volumes; and the interest rate spread earned on the investment of cash deposited by investment firms as collateral for securities they have borrowed. The Other fee category in Asset Servicing includes such products as investment risk and analytical services, benefit payments, and other services. Revenue from these products is based generally on the volume of services provided or a fixed fee.

Custody and Fund Administration fees decreased in 2023 from 2022 primarily due to unfavorable lagged markets. Investment Management fees in 2023 decreased from 2022 primarily due to asset outflows, partially offset by lower money market fund fee waivers.

The following tables provide a breakdown of the Asset Servicing assets under custody and AUM.

TABLE 7: ASSET SERVICING ASSETS UNDER CUSTODY

	DECEMBER 31,						CHANGE
($ In Billions)	2023		2022		2021		2023 / 2022		2022 / 2021
North America	$	6,373.4	$	5,703.1	$	6,566.4	12	%	(13)	%
Europe, Middle East, and Africa	3,493.9		3,037.6		3,894.3		15		(22)
Asia Pacific	847.3		823.3		898.5		3		(8)
Securities Lending	167.4		148.3		195.6		13		(24)
Total Assets Under Custody	$	10,882.0	$	9,712.3	$	11,554.8	12	%	(16)	%

TABLE 8: ASSET SERVICING ASSETS UNDER MANAGEMENT

	DECEMBER 31,						CHANGE
($ In Billions)	2023		2022		2021		2023 / 2022		2022 / 2021
North America	$	681.3	$	586.0	$	789.2	16	%	(26)	%
Europe, Middle East, and Africa	141.8		121.3		148.5		17		(18)
Asia Pacific	41.5		42.5		57.7		(2)		(26)
Securities Lending	167.4		148.3		195.6		13		(24)
Total Assets Under Management	$	1,032.0	$	898.1	$	1,191.0	15	%	(25)	%

Cash and other assets deposited by investment firms as collateral for securities borrowed from custody clients are managed by Northern Trust and are included in assets under custody and under management. This securities lending collateral totaled $167.4 billion and $148.3 billion at December 31, 2023 and 2022, respectively.

Wealth Management

Wealth Management fee income is calculated primarily based on market values and is impacted by both one-month and one-quarter lagged asset values. Fee income in the regions decreased in 2023 from 2022 primarily due to product-related asset outflows, partially offset by favorable lagged markets. Global Family Office fee income was relatively flat primarily due to unfavorable lagged markets, partially offset by lower money market fund fee waivers and asset inflows. The following tables provide a summary of Wealth Management assets under custody and under management.

TABLE 9: WEALTH MANAGEMENT ASSETS UNDER CUSTODY

	DECEMBER 31,						CHANGE
($ In Billions)	2023		2022		2021		2023 / 2022		2022 / 2021
Global Family Office	$	728.0	$	614.9	$	742.6	18	%	(17)	%
Central	120.7		124.2		139.1		(3)		(11)
East	119.8		92.0		105.0		30		(12)
West	66.0		61.2		70.8		8		(13)
Total Assets Under Custody	$	1,034.5	$	892.3	$	1,057.5	16	%	(16)	%

TABLE 10: WEALTH MANAGEMENT ASSETS UNDER MANAGEMENT

	DECEMBER 31,						CHANGE
($ In Billions)	2023		2022		2021		2023 / 2022		2022 / 2021
Global Family Office	$	144.3	$	119.9	$	144.9	20	%	(17)	%
Central	102.8		110.2		128.7		(7)		(14)
East	100.0		71.4		84.5		40		(16)
West	55.4		49.9		58.0		11		(14)
Total Assets Under Management	$	402.5	$	351.4	$	416.1	15	%	(16)	%

42 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The Wealth Management regions shown are comprised of the following: Central includes Illinois, Michigan, Minnesota, Missouri, Ohio and Wisconsin; East includes Connecticut, Delaware, Florida, Georgia, Massachusetts, New York, Pennsylvania, and Washington, D.C.; West includes Arizona, California, Colorado, Nevada, Texas, and Washington. Global Family Office provides customized services, including but not limited to investment consulting, global custody, fiduciary, and private banking, to meet the complex financial needs of ultra-high-net-worth individuals and family offices across the globe.

Market Indices

The following tables present selected market indices and the percentage changes year-over-year to provide context regarding equity and fixed income market impacts on the Corporation’s results.

TABLE 11: EQUITY MARKET INDICES

	DAILY AVERAGES				YEAR-END
	2023	2022	CHANGE		2023	2022	CHANGE
S&P 500	4,282	4,101	4	%	4,770	3,840	24	%
MSCI EAFE (U.S. dollars)	2,092	1,976	6		2,236	1,944	15
MSCI EAFE (local currency)	1,331	1,249	7		1,393	1,232	13

TABLE 12: FIXED INCOME MARKET INDICES

	AS OF DECEMBER 31,
	2023	2022	CHANGE
Barclays Capital U.S. Aggregate Bond Index	2,162	2,049	6	%
Barclays Capital Global Aggregate Bond Index	471	446	6

Client Assets

Northern Trust, in the normal course of business, holds assets under custody/administration and management in a fiduciary or agency capacity for its clients. In accordance with GAAP, these assets are not assets of Northern Trust and are not included in its consolidated balance sheets. AUC/A and AUM are a driver of our Trust, Investment and Other Servicing Fees. For the purposes of disclosing AUC/A, to the extent that both custody and administration services are provided, the value of the assets is included only once in this amount.

At December 31, 2023, AUC/A increased from December 31, 2022, primarily reflecting favorable markets. Assets under custody, a component of AUC/A, at December 31, 2023, increased from December 31, 2022 and included $8.01 trillion of global custody assets compared to $6.91 trillion at December 31, 2022.

The following table presents AUC/A by reporting segment.

TABLE 13: ASSETS UNDER CUSTODY/ADMINISTRATION BY REPORTING SEGMENT

	DECEMBER 31,						CHANGE
($ In Billions)	2023		2022		2021		2023 /2022		2022 /2021
Asset Servicing	$	14,362.6	$	12,705.5	$	15,183.2	13	%	(16)	%
Wealth Management	1,042.3		898.5		1,065.6		16		(16)
Total Assets Under Custody/Administration	$	15,404.9	$	13,604.0	$	16,248.8	13	%	(16)	%

The following table presents assets under custody, a component of AUC/A, by reporting segment.

TABLE 14: ASSETS UNDER CUSTODY BY REPORTING SEGMENT

	DECEMBER 31,						CHANGE
($ In Billions)	2023		2022		2021		2023 /2022		2022 / 2021
Asset Servicing	$	10,882.0	$	9,712.3	$	11,554.8	12	%	(16)	%
Wealth Management	1,034.5		892.3		1,057.5		16		(16)
Total Assets Under Custody	$	11,916.5	$	10,604.6	$	12,612.3	12	%	(16)	%

Consolidated assets under custody increased from the prior year, primarily reflecting favorable markets.

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 43

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following table presents the investment allocation of Northern Trust’s custodied assets by reporting segment.

TABLE 15: ALLOCATION OF ASSETS UNDER CUSTODY

	DECEMBER 31,
	2023						2022						2021
	AS		WM		TOTAL		AS		WM		TOTAL		AS		WM		TOTAL
Equities	46	%	60	%	47	%	44	%	56	%	45	%	47	%	61	%	48	%
Fixed Income Securities	33		13		31		33		15		32		35		13		33
Cash and Other Assets	19		27		21		21		29		22		16		26		17
Securities Lending Collateral	2		—		1		2		—		1		2		—		2

The following table presents Northern Trust’s assets under custody by investment type.

TABLE 16: ASSETS UNDER CUSTODY BY INVESTMENT TYPE

	DECEMBER 31,						CHANGE
($ In Billions)	2023		2022		2021		2023 / 2022		2022 / 2021
Equities	$	5,652.5	$	4,810.7	$	6,049.1	17	%	(20)	%
Fixed Income Securities	3,737.1		3,386.1		4,139.6		10		(18)
Cash and Other Assets	2,359.5		2,259.5		2,228.0		4		1
Securities Lending Collateral	167.4		148.3		195.6		13		(24)
Total Assets Under Custody	$	11,916.5	$	10,604.6	$	12,612.3	12	%	(16)	%

The following table presents Northern Trust’s AUM by reporting segment.

TABLE 17: ASSETS UNDER MANAGEMENT BY REPORTING SEGMENT

	DECEMBER 31,						CHANGE
($ In Billions)	2023		2022		2021		2023 / 2022		2022 / 2021
Asset Servicing	$	1,032.0	$	898.1	$	1,191.0	15	%	(25)	%
Wealth Management	402.5		351.4		416.1		15		(16)
Total Assets Under Management	$	1,434.5	$	1,249.5	$	1,607.1	15	%	(22)	%

AUM at the end of 2023 increased from 2022. The increase primarily reflected favorable markets, net inflows, and favorable currency translation.

The following table presents the investment allocation of Northern Trust’s AUM by reporting segment.

TABLE 18: ASSETS UNDER MANAGEMENT BY INVESTMENT TYPE

	DECEMBER 31,
	2023						2022						2021
	AS		WM		TOTAL		AS		WM		TOTAL		AS		WM		TOTAL
Equities	55	%	55	%	55	%	54	%	53	%	54	%	53	%	55	%	53	%
Fixed Income Securities	11		22		14		12		23		15		11		20		13
Cash and Other Assets	18		23		19		17		24		19		20		25		22
Securities Lending Collateral	16		—		12		17		—		12		16		—		12

44 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Other Noninterest Income

The components of Other Noninterest Income, and a discussion of significant changes during 2023 and 2022, are provided below.

TABLE 19: OTHER NONINTEREST INCOME

	FOR THE YEAR ENDED DECEMBER 31,						CHANGE
($ In Millions)	2023		2022		2021		2023 / 2022		2022 / 2021
Foreign Exchange Trading Income	$	203.9	$	288.6	$	292.6	(29)	%	(1)	%
Treasury Management Fees	31.6		39.3		44.3		(20)		(11)
Security Commissions and Trading Income	135.0		136.2		140.2		(1)		(3)
Other Operating Income	228.7		191.3		243.9		19		(22)
Investment Security Gains (Losses), net	(169.5)		(214.0)		(0.3)		N/M		N/M
Total Other Noninterest Income	$	429.7	$	441.4	$	720.7	(3)	%	(39)	%

Foreign Exchange Trading Income

Northern Trust provides foreign exchange services in the normal course of business as an integral part of its global custody services. Active management of currency positions, within conservative limits, also contributes to foreign exchange trading income. Foreign Exchange Trading Income in 2023 decreased from 2022, primarily driven by lower volatility, a decline in client volumes, and an unfavorable impact from foreign exchange swap activity in Treasury.

Treasury Management Fees

Treasury Management Fees, generated from cash and treasury management products and services provided to clients, in 2023 decreased from 2022, primarily due to an increase in the earnings credit rate applied to client balances.

Security Commissions and Trading Income

Security Commissions and Trading Income, generated primarily from securities brokerage services provided by Northern Trust Securities, Inc., in 2023 decreased from 2022, primarily driven by lower equity commissions from lower equity trading volumes.

Other Operating Income

Other Operating Income in 2023 increased from 2022 primarily due to higher income associated with a market value increase in supplemental compensation plans and higher banking and credit-related services fees.

Please refer to Note 18, “Other Operating Income” included under Item 8, “Financial Statements and Supplementary Data,” for additional details related to Other Operating Income.

Investment Security Gains (Losses), Net

Investment Security Gains (Losses), net reflects a $176.4 million available for sale debt security loss arising from a repositioning of the portfolio during the fourth quarter of 2023 and a $6.9 million gain upon sale of certain available for sale debt securities in the first quarter of 2023. In the prior year, there was a $213.0 million loss related to an intent to sell available for sale debt securities also arising from a repositioning of the portfolio.

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 45

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Net Interest Income

Net Interest Income is defined as the total of Interest Income and amortized fees on earning assets, less Interest Expense on deposits and borrowed funds, adjusted for the impact of interest-related hedging activity. Earning assets—including Federal Funds Sold, Securities Purchased under Agreements to Resell, Interest-Bearing Due from and Deposits with Banks, Federal Reserve and Other Central Bank Deposits, Securities, Loans and Leases, and Other Interest-Earning Assets—are financed by a large base of interest-bearing liabilities that include client deposits, short-term borrowings, Senior Notes and Long-Term Debt. Short-term borrowings include Federal Funds Purchased, Securities Sold Under Agreements to Repurchase, and Other Borrowings. Earning assets also are funded by noninterest-bearing funds, which include demand deposits and Stockholders’ Equity. Net Interest Income is subject to variations in the level and mix of earning assets and interest-bearing funds and their relative sensitivity to interest rates. In addition, the levels of nonaccruing assets and client compensating deposit balances used to pay for services impact Net Interest Income.

Net interest margin is the difference between what we earn on our assets and what we pay for deposits and other sources of funding. The direction and level of interest rates are important factors in our earnings. Net interest margin is calculated by dividing annualized Net Interest Income by average interest-earning assets.

Net Interest Income stated on an FTE basis is a non-GAAP financial measure that facilitates the analysis of asset yields. Management believes an FTE presentation provides a clearer indication of net interest margins for comparative purposes. When adjusted to an FTE basis, yields on taxable, nontaxable, and partially taxable assets are comparable; however, the adjustment to an FTE basis has no impact on Net Income. A reconciliation of Net Interest Income on a GAAP basis to Net Interest Income on an FTE basis is provided in “Supplemental Information—Reconciliation to Fully Taxable Equivalent” within this “Management’s Discussion and Analysis of Financial Condition and Results of Operations” section.

46 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following tables present an analysis of average daily balances and interest rates affecting Net Interest Income and an analysis of Net Interest Income changes.

TABLE 20: AVERAGE CONSOLIDATED BALANCE SHEETS WITH ANALYSIS OF NET INTEREST INCOME (INTEREST AND RATE ON A FULLY TAXABLE EQUIVALENT BASIS)(1)

	2023						2022						2021
($ In Millions)	INTEREST		AVERAGE BALANCE		AVERAGE RATE(8)		INTEREST		AVERAGE BALANCE		AVERAGE RATE(8)		INTEREST		AVERAGE BALANCE		AVERAGE RATE(8)
INTEREST-EARNING ASSETS
Federal Reserve and Other Central Bank Deposits	$	1,462.3	$	31,205.4	4.69	%	$	472.0	$	36,248.8	1.30	%	$	11.3	$	39,028.2	0.03	%
Interest-Bearing Due from and Deposits with Banks(2)	130.1		4,333.9		3.00		46.6		4,192.5		1.11		9.1		5,779.7		0.16
Federal Funds Sold	0.3		6.1		4.92		0.1		5.5		3.22		—		0.1		0.41
Securities Purchased under Agreements to Resell(3)	1,585.2		950.9		166.71		103.7		1,071.2		9.68		3.5		1,067.4		0.33
Debt Securities
Available For Sale	1,059.7		24,356.6		4.35		612.8		32,060.2		1.91		497.6		38,986.9		1.28
Held To Maturity	478.0		25,511.9		1.87		289.5		22,970.0		1.26		164.3		20,617.0		0.80
Trading Account	0.1		0.5		13.50		0.4		12.1		3.84		—		0.6		1.59
Total Debt Securities	1,537.8		49,869.0		3.08		902.7		55,042.3		1.64		661.9		59,604.5		1.11
Loans and Leases(4)	2,556.8		42,177.0		6.06		1,348.0		41,030.6		3.28		715.6		37,207.5		1.92
Other Interest-Earning Assets(5)	110.0		2,259.0		4.87		50.2		1,248.1		4.03		40.7		1,185.6		3.43
Total Interest-Earning Assets	7,382.5		130,801.3		5.64		2,923.3		138,839.0		2.11		1,442.1		143,873.0		1.00
Cash and Due from Banks and Other Central Bank Deposits(6)	—		1,771.6		—		—		2,069.5		—		—		2,285.9		—
Other Noninterest-Earning Assets	—		10,076.3		—		—		11,643.4		—		—		10,204.3		—
Total Assets	$	—	$	142,649.2	—	%	$	—	$	152,551.9	—	%	$	—	$	156,363.2	—	%
AVERAGE SOURCE OF FUNDS
Deposits
Savings, Money Market, and Other	$	689.2	$	24,172.4	2.85	%	$	222.3	$	30,205.0	0.74	%	$	12.8	$	28,339.0	0.05	%
Savings Certificates and Other Time	151.9		3,341.2		4.54		17.8		1,059.7		1.68		4.8		887.2		0.55
Non-U.S. Offices – Interest-Bearing	1,844.2		60,008.6		3.07		362.7		65,031.3		0.56		(78.9)		69,713.4		(0.11)
Total Interest-Bearing Deposits	2,685.3		87,522.2		3.07		602.8		96,296.0		0.63		(61.3)		98,939.6		(0.06)
Federal Funds Purchased	256.9		5,144.3		4.99		34.1		1,407.8		2.43		(0.4)		190.6		(0.19)
Securities Sold under Agreements to Repurchase(3)	1,541.1		401.5		383.84		90.7		433.6		20.94		0.2		232.0		0.07
Other Borrowings(7)	542.5		10,339.5		5.25		126.2		5,463.5		2.31		14.2		5,049.8		0.28
Senior Notes	170.0		2,734.0		6.22		92.7		2,756.0		3.36		48.3		2,856.4		1.69
Long-Term Debt	147.2		2,586.0		5.69		44.0		1,258.9		3.49		21.1		1,166.1		1.81
Floating Rate Capital Debt	—		—		—		—		—		—		1.7		218.4		0.78
Total Interest-Bearing Liabilities	5,343.0		108,727.5		4.91		990.5		107,615.8		0.92		23.8		108,652.9		0.02
Interest Rate Spread	—		—		0.73		—		—		1.19		—		—		0.98
Demand and Other Noninterest-Bearing Deposits	—		17,723.3		—		—		29,296.4		—		—		31,143.5		—
Other Noninterest-Bearing Liabilities	—		4,701.6		—		—		4,558.3		—		—		4,869.8		—
Stockholders’ Equity	—		11,496.8		—		—		11,081.4		—		—		11,697.0		—
Total Liabilities and Stockholders’ Equity	$	—	$	142,649.2	—	%	$	—	$	152,551.9	—	%	$	—	$	156,363.2	—	%
Net Interest Income/Margin (FTE Adjusted)	$	2,039.5	$	—	1.56	%	$	1,932.8	$	—	1.39	%	$	1,418.3	$	—	0.99	%
Net Interest Income/Margin (Unadjusted)	$	1,982.0	$	—	1.52	%	$	1,887.2	$	—	1.36	%	$	1,382.7	$	—	0.96	%

(1) Northern Trust’s non-U.S. activities are primarily related to its asset servicing, asset management, foreign exchange, cash management, and commercial banking businesses. The operations of Northern Trust are managed on a reporting segment basis and include components of both U.S and non-U.S. source income and assets. Non-U.S. source income and assets are not separately identified in Northern Trust’s internal management reporting system. However, Northern Trust is required to disclose non-U.S. activities based on the domicile of the customer. Due to the complex and integrated nature of Northern Trust’s activities, it is difficult to segregate with precision revenues, expenses and assets between U.S. and non-U.S.-domiciled customers. On the basis of averages, the percentage of total assets attributable to foreign activities was 17%, 18%, and 19% as of December 31, 2023, 2022 and 2021, respectively. On the basis of averages, the percentage of total liabilities attributable to foreign activities was 52%, 55%, and 58% as of December 31, 2023, 2022 and 2021, respectively. For additional information, refer to the Geographic Area Information section of Note 31, “Reporting Segments and Related Information,” provided in Item 8, “Financial Statements and Supplementary Data.”

(2) Interest-Bearing Due from and Deposits with Banks includes the interest-bearing component of Cash and Due from Banks and Interest-Bearing Deposits with Banks as presented on the consolidated balance sheets.

(3) Includes the impact of balance sheet netting under master netting arrangements of approximately $29.1 billion and $3.6 billion in 2023 and 2022, respectively. Excluding the impact of netting, the average interest rate on Securities Purchased under Agreements to Resell would be approximately 5.27% and 2.23% in 2023 and 2022, respectively. Excluding the impact of netting, the average interest rate on Securities Sold under Agreements to Repurchase would be approximately 5.22% and 2.27% in 2023 and 2022, respectively. Northern Trust nets securities sold under repurchase agreements against those purchased under resale agreements when there is a legally enforceable master netting arrangement.

(4) Average balances include nonaccrual loans.

(5) Other Interest-Earning Assets include certain community development investments, collateral deposits with certain securities depositories and clearing houses, Federal Home Loan Bank and Federal Reserve stock, and money market investments which are classified in Other Assets on the consolidated balance sheets.

(6) Cash and Due from Banks and Other Central Bank Deposits includes the noninterest-bearing component of Federal Reserve and Other Central Bank Deposits on the consolidated balance sheets.

(7) Other Borrowings primarily includes advances from the Federal Home Loan Bank of Chicago.

(8) Rate calculations are based on actual balances rather than the rounded amounts presented in the average consolidated balance sheets with analysis of Net Interest Income.

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 47

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

TABLE 21: ANALYSIS OF NET INTEREST INCOME CHANGES DUE TO VOLUME AND RATE(1)

(INTEREST AND RATE ON A FULLY TAXABLE EQUIVALENT BASIS)	2023 VS. 2022 CHANGE DUE TO						2022 VS. 2021 CHANGE DUE TO
(In Millions)	AVERAGE BALANCE		AVERAGE RATE		NET (DECREASE) INCREASE		AVERAGE BALANCE		AVERAGE RATE		NET (DECREASE) INCREASE
Increase (Decrease) in Net Interest Income (FTE)
Federal Reserve and Other Central Bank Deposits	$	(74.4)	$	1,064.7	$	990.3	$	(0.9)	$	461.6	$	460.7
Interest-Bearing Due from and Deposits with Banks	1.7		81.8		83.5		(3.1)		40.6		37.5
Federal Funds Sold	—		0.2		0.2		0.1		—		0.1
Securities Purchased under Agreements to Resell	(12.9)		1,494.4		1,481.5		—		100.2		100.2
Debt Securities
Available For Sale	(176.9)		623.8		446.9		(78.2)		193.4		115.2
Held To Maturity	34.9		153.6		188.5		20.6		104.6		125.2
Trading Account	(0.7)		0.4		(0.3)		0.4		—		0.4
Total Debt Securities	(142.7)		777.8		635.1		(57.2)		298.0		240.8
Loans and Leases	38.6		1,170.2		1,208.8		80.1		552.3		632.4
Other Interest-Earning Assets	47.5		12.3		59.8		2.2		7.3		9.5
Total Interest Income	$	(142.2)	$	4,601.4	$	4,459.2	$	21.2	$	1,460.0	$	1,481.2
Interest-Bearing Deposits
Savings, Money Market and Other	$	(52.8)	$	519.7	$	466.9	$	1.0	$	208.5	$	209.5
Savings Certificates and Other Time	74.9		59.2		134.1		1.1		11.9		13.0
Non-U.S. Offices - Interest-Bearing	(30.2)		1,511.7		1,481.5		(3.6)		445.2		441.6
Total Interest-Bearing Deposits	(8.1)		2,090.6		2,082.5		(1.5)		665.6		664.1
Federal Funds Purchased	159.3		63.5		222.8		7.7		26.8		34.5
Securities Sold under Agreements to Repurchase	(7.2)		1,457.6		1,450.4		0.2		90.3		90.5
Other Borrowings	171.8		244.5		416.3		1.3		110.7		112.0
Senior Notes	(0.7)		78.0		77.3		(1.8)		46.2		44.4
Long-Term Debt	64.6		38.6		103.2		1.8		21.1		22.9
Floating Rate Capital Debt	—		—		—		(1.7)		—		(1.7)
Total Interest Expense	$	379.7	$	3,972.8	$	4,352.5	$	6.0	$	960.7	$	966.7
(Decrease) Increase in Net Interest Income (FTE)	$	(521.9)	$	628.6	$	106.7	$	15.2	$	499.3	$	514.5

(1) Changes not due solely to average balance changes or rate changes are allocated proportionately to average balance and rate based on their relative absolute magnitudes.

Notes:    Net Interest Income (FTE), a non-GAAP financial measure, includes adjustments to a fully taxable equivalent basis for loans, securities and other interest-earning assets. The adjustments are based on a federal income tax rate of 21.0%, where the rate is adjusted for applicable state income taxes, net of related federal tax benefit. Total taxable equivalent interest adjustments amounted to $57.5 million in 2023, $45.6 million in 2022 and $35.6 million in 2021. A reconciliation of Net Interest Income and net interest margin on a GAAP basis to Net Interest Income and net interest margin on an FTE basis (each of which is a non-GAAP financial measure) is provided in “Supplemental Information—Reconciliation to Fully Taxable Equivalent” within this “Management’s Discussion and Analysis of Financial Condition and Results of Operations” section. Net interest margin is calculated by dividing annualized net interest income by average interest-earning assets.

Interest revenue on cash collateral positions is reported above within Interest-Bearing Due from and Deposits with Banks and within Loans and Leases. Interest expense on cash collateral positions is reported above within Non-U.S. Offices Interest-Bearing Deposits. Related cash collateral received from and deposited with derivative counterparties is recorded net of the associated derivative contract in Other Assets and Other Liabilities, respectively.

Net Interest Income in 2023 increased from 2022. Net Interest Income, stated on an FTE basis, increased from 2022, due to a higher net interest margin, partially offset by lower levels of average earning assets. Average earning assets in 2023 decreased from 2022, primarily due to lower client deposits, partially offset by higher borrowing activity, the net of which resulted in lower funding of earning assets.

The net interest margin in 2023 increased from 2022. The net interest margin on an FTE basis in 2023 increased from 2022, primarily due to higher average interest rates, partially offset by an unfavorable funding mix shift.

Federal Reserve and Other Central Bank Deposits averaged $31.2 billion in 2023, which decreased $5.0 billion, or 14%, from $36.2 billion in 2022, due to deposit outflows. Interest-Bearing Due From and Deposits with Banks averaged $4.3 billion in 2023 and $4.2 billion in 2022. Average Securities were $49.9 billion and decreased $5.1 billion, or 9%, from $55.0 billion in 2022. Average taxable Securities were $46.8 billion in 2023 and $52.4 billion in 2022. Average nontaxable Securities, which represent securities that are primarily exempt from U.S. federal and state income taxes, were $3.1 billion in 2023 and $2.6 billion in 2022.

48 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Loans averaged $42.2 billion in 2023, which increased $1.2 billion, or 3%, from $41.0 billion in 2022, primarily reflecting higher levels of commercial real estate, commercial and institutional, and private client loans, partially offset by non-U.S. loans. Commercial real estate loans averaged $5.0 billion in 2023 and increased $549.4 million, or 12%, from $4.4 billion for 2022. Commercial and institutional loans averaged $12.4 billion in 2023 and increased $180.0 million, or 1%, from $12.3 billion for 2022. Private client loans averaged $14.0 billion in 2023 and increased $122.3 million, or 1%, from $13.9 billion for 2022. Non-U.S. loans averaged $3.4 billion in 2023 and decreased $101.8 million, or 3%, from $3.5 billion for 2022. Residential real estate loans averaged $6.4 billion in 2023 and was relatively unchanged from $6.4 billion for 2022.

Average Other Interest-Earning Assets include certain community development investments, collateral deposits with certain securities depositories and clearing houses, Federal Home Loan Bank stock, money market investments, and Federal Reserve stock of $899.2 million, $825.2 million, $364.6 million, $84.3 million, and $70.0 million, respectively, which are recorded in Other Assets on the consolidated balance sheets.

Northern Trust utilizes a diverse mix of funding sources. Average Interest-Bearing Deposits decreased $8.8 billion, or 9%, to $87.5 billion in 2023 from $96.3 billion in 2022. Interest expense for Interest-Bearing Deposits in the current year was driven by higher interest rates. Average Non-U.S. Offices Interest-Bearing Deposits comprised 69% and 68% of total average Interest-Bearing Deposits for the years ended December 31, 2023 and 2022, respectively. Average Total Interest-Bearing Liabilities increased $1.1 billion, or 1%, to $108.7 billion in 2023 from $107.6 billion in 2022. The balances within short-term borrowing classifications vary based on funding requirements and strategies, interest rate levels, changes in the volume of lower-cost deposit sources, and the availability of collateral to secure these borrowings. Average net noninterest-bearing funds decreased $9.1 billion, or 29%, to $22.1 billion in 2023 from $31.2 billion in 2022, primarily resulting from lower levels of Demand and Other Noninterest-Bearing Deposits. Average Demand and Other Noninterest-Bearing Deposits decreased $11.6 billion, or 40%, to $17.7 billion in 2023 from $29.3 billion in 2022. The average rate on total source of funds was 4.07% in 2023 and 0.70% in 2022.

Stockholders’ Equity

Stockholders’ Equity averaged $11.5 billion in 2023, compared with $11.1 billion in 2022. The increase in average Stockholders’ Equity of $415.4 million, or 4%, was primarily due to higher Retained Earnings. During the year ended December 31, 2023, the Corporation maintained its quarterly common stock dividend at $0.75 per share. During the year ended December 31, 2023, the Corporation, through common stock dividends and repurchase of 4,384,678 shares of common stock, returned $977.7 million in capital to common stockholders. During the year ended December 31, 2022, the Corporation increased its quarterly common stock dividend to $0.75 per share in the third quarter from $0.70 per share in the second quarter. During the year ended December 31, 2022, the Corporation, through common stock dividends and repurchase of 311,536 shares of common stock, returned $648.4 million in capital to common stockholders.

The Corporation’s current stock repurchase authorization to repurchase up to 25.0 million shares was approved by the Board of Directors in October 2021. Shares are repurchased by the Corporation to, among other things, manage the Corporation’s capital levels. Repurchased shares are used for general purposes, including the issuance of shares under stock option and other equity incentive plans. The repurchase authorization approved by the Board of Directors has no expiration date, thus the Corporation retains the ability to resume repurchases thereunder when circumstances warrant and applicable regulations permit. Please refer to Note 13, “Stockholders’ Equity,” provided in Item 8, “Financial Statements and Supplementary Data.”

Provision for Credit Losses

There was a $24.5 million Provision for Credit Losses in 2023, as compared to a Provision for Credit Losses of $12.0 million in 2022. The provision during 2023 was primarily due to a $16.5 million increase in the reserve evaluated on a collective basis, which relates to pooled financial assets sharing similar risk characteristics. The increase in the provision for loans was primarily seen in the commercial real estate portfolio, driven by an increase in the size and duration of the portfolio, weaker economic projections for the industry, methodology updates, and credit quality deterioration on a small number of loans. The release of credit reserves in undrawn loan commitments and letters of credit during the year ended December 31, 2023 is primarily in the commercial and institutional portfolio, reflecting a combination of credit quality improvements, an improved macroeconomic outlook for that segment, and methodology updates. The remainder of the provision was due to $5.0 million in charge-offs and a $3.0 million increase in the individual reserve. The prior-year provision primarily reflected an increase in the reserve evaluated on a collective basis, driven by weaker macroeconomic conditions at the time and portfolio growth, partially offset by improvements in credit quality. The increase in the collective basis reserve was primarily reflected in certain commercial portfolios.

Net charge-offs in 2023 totaled $5.0 million resulting from $8.7 million of charge-offs and $3.7 million of recoveries, compared to net recoveries of $4.2 million in 2022 resulting from $6.0 million of charge-offs and $10.2 million of recoveries. For additional discussion of the Allowance for Credit Losses, refer to the “Asset Quality” section.

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 49

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Noninterest Expense

Noninterest Expense for 2023 increased from 2022, primarily reflecting increased Other Operating Expense, Equipment and Software, and Compensation.

The components of Noninterest Expense and a discussion of significant changes during 2023 and 2022 are provided below.

TABLE 22: NONINTEREST EXPENSE

	FOR THE YEAR ENDED DECEMBER 31,						CHANGE
($ In Millions)	2023		2022		2021		2023 / 2022		2022 / 2021
Compensation	$	2,321.8	$	2,248.0	$	2,011.0	3	%	12	%
Employee Benefits	405.2		437.4		431.4		(7)		1
Outside Services	906.5		880.3		849.4		3		4
Equipment and Software	945.5		838.8		736.3		13		14
Occupancy	232.3		219.1		208.7		6		5
Other Operating Expense	472.9		359.3		299.1		32		20
Total Noninterest Expense	$	5,284.2	$	4,982.9	$	4,535.9	6	%	10	%

Compensation

Compensation expense, the largest component of Noninterest Expense, increased in 2023 from 2022, primarily reflecting higher salary expense, partially offset by lower incentives. Severance-related charges were $36.7 million in 2023 as compared to $30.4 million in 2022. Full-time equivalent employees totaled approximately 23,100 at December 31, 2023, down 2% from approximately 23,600 at December 31, 2022.

Employee Benefits

Employee Benefits expense in 2023 decreased from 2022, primarily due to a $44.1 million pension settlement charge in 2022.

Outside Services

Outside Services expense in 2023 increased from 2022, primarily reflecting higher technical services costs, partially offset by lower consulting services.

Equipment and Software

Equipment and Software expense in 2023 increased from 2022, primarily due to higher software amortization and higher software costs.

Occupancy

Occupancy expense in 2023 increased from 2022, primarily due to net rent increases and charges related to reducing Northern Trust’s real estate footprint.

Other Operating Expense

Other Operating Expense in 2023 increased from 2022 primarily reflecting an $84.6 million FDIC special assessment and a $25.6 million charge related to the write-off of an investment in a client capability.

In November 2023, the FDIC issued a final rule to implement a special assessment to recoup losses to the deposit insurance fund associated with bank failures in the first half of 2023. In conjunction with the special assessment, $84.6 million was recognized as an accrued liability and related expense in the fourth quarter of 2023. The final amount of the total special assessment incurred by Northern Trust may be adjusted as the FDIC's loss estimates change. The final rule becomes effective on April 1, 2024, with the first payment due on June 28, 2024.

Please refer to Note 19, “Other Operating Expense” included under Item 8, “Financial Statements and Supplementary Data,” for additional details related to other operating expenses.

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MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Provision for Income Taxes

The 2023 Provision for Income Taxes was $357.5 million, representing an effective rate of 24.4%. This compares with a Provision for Income Taxes of $430.3 million and an effective rate of 24.4% in 2022.

See Note 20, “Income Taxes,” provided in Item 8, “Financial Statements and Supplementary Data,” for more information on income taxes.

REPORTING SEGMENTS AND RELATED INFORMATION

The following information summarizes our consolidated results of operations by reporting segment for 2023 compared to 2022. For a discussion related to the consolidated results of operations by reporting segment for 2022 compared to 2021, refer to Part II, Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” in our 2022 Form 10-K, which was filed with the SEC on February 28, 2023.

    Northern Trust is organized around its two client-focused reporting segments: Asset Servicing and Wealth Management. Asset management and related services are provided to Asset Servicing and Wealth Management clients primarily by the Asset Management business. The revenue and expenses of Asset Management and certain other support functions are allocated fully to Asset Servicing and Wealth Management.

Reporting segment financial information, presented on an internal management-reporting basis, is determined by accounting systems used to allocate revenue and expense to each segment, and incorporates processes for allocating assets, liabilities, equity and the applicable interest income and expense utilizing a funds transfer pricing (FTP) methodology. Under the methodology, assets and liabilities receive a funding charge or credit that considers interest rate risk, liquidity risk, and other product characteristics on an instrument level. Additionally, segment information is presented on a fully taxable equivalent (FTE) basis as management believes an FTE presentation provides a clearer indication of net interest income. The adjustment to an FTE basis has no impact on Net Income.

Equity is allocated to the reporting segments based on a variety of factors including, but not limited to, risk, regulatory considerations, and internal metrics. Allocations of capital and certain corporate expense may not be representative of levels that would be required if the segments were independent entities. The accounting policies used for management reporting are consistent with those described in Note 1, “Summary of Significant Accounting Policies.” Transfers of income and expense items are recorded at cost; there is no consolidated profit or loss on sales or transfers between reporting segments. Northern Trust’s presentations are not necessarily consistent with similar information for other financial institutions.

Revenues, expenses and average assets are allocated to Asset Servicing and Wealth Management, with the exception of non-recurring activities such as certain corporate transactions and costs incurred associated with acquisitions, divestitures, litigation, restructuring, and tax adjustments not directly attributable to a specific reporting segment, which are reported within the Other segment.

Reporting segment results are subject to reclassification when organizational changes are made. The results are also subject to refinements in revenue and expense allocation methodologies, which are typically reflected on a prospective basis.

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MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following table presents the earnings and average assets for the Corporation.

TABLE 23: CONSOLIDATED FINANCIAL INFORMATION

	FOR THE YEAR ENDED DECEMBER 31,						CHANGE
($ In Millions)	2023		2022		2021		2023 / 2022		2022 / 2021
Noninterest Income
Trust, Investment and Other Servicing Fees	$	4,361.8	$	4,432.6	$	4,361.1	(2)	%	2	%
Foreign Exchange Trading Income	203.9		288.6		292.6		(29)		(1)
Other Noninterest Income	225.8		152.8		428.1		48		(64)
Total Noninterest Income	4,791.5		4,874.0		5,081.8		(2)		(4)
Net Interest Income	1,982.0		1,887.2		1,382.7		5		36
Revenue	6,773.5		6,761.2		6,464.5		—		5
Provision for (Release of) Credit Losses	24.5		12.0		(81.5)		N/M		N/M
Noninterest Expense	5,284.2		4,982.9		4,535.9		6		10
Income before Income Taxes	1,464.8		1,766.3		2,010.1		(17)		(12)
Provision for Income Taxes	357.5		430.3		464.8		(17)		(7)
Net Income	$	1,107.3	$	1,336.0	$	1,545.3	(17)	%	(14)	%
Average Assets	$	142,649.2	$	152,551.9	$	156,363.2	(6)	%	(2)	%

Segment results are stated on an FTE basis which has no impact on Net Income. Net Interest Income on an FTE basis includes FTE adjustments of $57.5 million, $45.6 million, and $35.6 million for 2023, 2022, and 2021, respectively. A reconciliation of total consolidated revenue, Net Interest Income and net interest margin on a GAAP basis to revenue, Net Interest Income and net interest margin on an FTE basis, respectively, (each of which is a non-GAAP financial measure) is provided in “Supplemental Information—Reconciliation to Fully Taxable Equivalent” within this “Management’s Discussion and Analysis of Financial Condition and Results of Operations” section.

Asset Servicing

Asset Servicing is a leading global provider of asset servicing and related services to corporate and public retirement funds, foundations, endowments, fund managers, insurance companies, sovereign wealth funds, and other institutional investors around the globe. Asset servicing and related services encompass a full range of capabilities including but not limited to: custody; fund administration; investment operations outsourcing; investment management; investment risk and analytical services; employee benefit services; securities lending; foreign exchange; treasury management; brokerage services; transition management services; banking; and cash management. Client relationships are managed through the Bank and the Bank’s and the Corporation’s other subsidiaries, including support from locations in North America, Europe, the Middle East, and the Asia-Pacific region. The following table summarizes the results of operations of Asset Servicing for the years ended December 31, 2023, 2022, and 2021 on a management-reporting basis.

TABLE 24: ASSET SERVICING RESULTS OF OPERATIONS

	FOR THE YEAR ENDED DECEMBER 31,									CHANGE
($ In Millions)	2023			2022			2021			2023 / 2022		2022 / 2021
Noninterest Income
Trust, Investment and Other Servicing Fees	$	2,461.9		$	2,496.3		$	2,487.3		(1)	%	—	%
Foreign Exchange Trading Income	213.0			281.0			279.0			(24)		1
Other Noninterest Income	263.4			250.7			261.2			5		(4)
Total Noninterest Income	2,938.3			3,028.0			3,027.5			(3)		—
Net Interest Income(1)	1,197.3			1,072.7			637.2			12		68
Revenue(1)	4,135.6			4,100.7			3,664.7			1		12
Provision for (Release of) Credit Losses	0.5			2.4			(33.8)			N/M		N/M
Noninterest Expense	3,273.2			3,092.7			2,863.0			6		8
Income before Income Taxes(1)	861.9			1,005.6			835.5			(14)		20
Provision for Income Taxes(1)	187.1			243.2			194.1			(23)		25
Net Income	$	674.8		$	762.4		$	641.4		(11)	%	19	%
Percentage of Consolidated Net Income	61		%	57		%	41		%
Average Assets	$	101,472.6		$	115,646.4		$	120,883.2		(12)	%	(4)	%

(1) Non-GAAP financial measures stated on an FTE basis.

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MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Asset Servicing Net Income

Asset Servicing Net Income decreased in 2023 compared to 2022, primarily reflecting higher Noninterest Expense and lower Foreign Exchange Trading Income, partially offset by higher Net Interest Income and lower Provision for Income Taxes.

Asset Servicing Trust, Investment and Other Servicing Fees

For an explanation of Asset Servicing Trust, Investment, and Other Servicing Fees, please see the “Trust, Investment, and Other Servicing Fees” section within the Consolidated Results of Operations section of the MD&A.

Asset Servicing Foreign Exchange Trading Income

Foreign Exchange Trading Income for 2023 decreased from 2022, primarily driven by lower volatility, a decline in client volumes, and an unfavorable impact from foreign exchange swap activity in Treasury that is allocated to Asset Servicing.

Asset Servicing Other Noninterest Income

Other Noninterest Income for 2023 increased from 2022, primarily due to higher Other Operating Income, partially offset by lower Treasury Management Fees.

Asset Servicing Net Interest Income

Net Interest Income on an FTE basis increased in 2023 from 2022, primarily due to higher average interest rates. Net interest margin on an FTE basis increased to 1.29% from 1.03%. Average earning assets of $92.5 billion, decreased $12.3 billion, or 12%, from $104.8 billion in the prior year. The earning assets in Asset Servicing consisted primarily of intercompany assets and loans. Funding sources were primarily comprised of non-U.S. custody-related interest-bearing deposits, which averaged $60.0 billion in 2023 as compared to $65.0 billion in 2022.

Asset Servicing Provision for Credit Losses

There was a Provision for Credit Losses of $0.5 million for 2023 compared to a Provision for Credit Losses of $2.4 million for 2022. The 2023 Provision for Credit Losses was primarily due to credit quality deterioration on a small number of loans, offset by a better overall macroeconomic outlook. The Provision for Credit Losses during 2022 primarily reflected weaker macroeconomic conditions at the time.

Asset Servicing Noninterest Expense

Asset Servicing Noninterest Expense, which includes the direct expense of the reporting segment, indirect expense allocations for product and operating support, and indirect expense allocations for certain corporate support services, increased in 2023 from 2022. The increase primarily reflects higher expense allocations.

Wealth Management

Wealth Management focuses on high-net-worth individuals and families, business owners, executives, professionals, retirees, and established privately-held businesses in its target markets. In supporting these targeted segments, Wealth Management provides trust, investment management, custody, and philanthropic services; financial consulting; guardianship and estate administration; family business consulting; family financial education; brokerage services; and private and business banking. Wealth Management also includes Global Family Office, which provides customized services, including but not limited to: investment consulting; global custody; fiduciary; and private banking; family office consulting, and technology solutions, to meet the complex financial and reporting needs of ultra-high-net-worth individuals and family offices across the globe. Wealth Management is one of the largest providers of advisory services in the United States with AUC/A, assets under custody, and AUM of $1.04 trillion, $1.03 trillion, and $402.5 billion, respectively, at December 31, 2023. Wealth Management services are delivered by multidisciplinary teams through a network of offices in 19 U.S. states and Washington, D.C., as well as offices in London, Guernsey, and Abu Dhabi.

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MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following table summarizes the results of operations of Wealth Management for the years ended December 31, 2023, 2022, and 2021 on a management-reporting basis.

TABLE 25: WEALTH MANAGEMENT RESULTS OF OPERATIONS

	FOR THE YEAR ENDED DECEMBER 31,									CHANGE
($ In Millions)	2023			2022			2021			2023 / 2022		2022 / 2021
Noninterest Income
Trust, Investment and Other Servicing Fees	$	1,899.9		$	1,936.3		$	1,873.8		(2)	%	3	%
Foreign Exchange Trading Income (Loss)	(9.1)			7.6			13.6			N/M		(44)
Other Noninterest Income	150.8			137.7			188.2			10		(27)
Total Noninterest Income	2,041.6			2,081.6			2,075.6			(2)		—
Net Interest Income(1)	842.2			860.1			781.1			(2)		10
Revenue(1)	2,883.8			2,941.7			2,856.7			(2)		3
Provision for (Release of) Credit Losses	24.0			9.6			(47.7)			N/M		N/M
Noninterest Expense	1,882.3			1,815.5			1,651.1			4		10
Income before Income Taxes(1)	977.5			1,116.6			1,253.3			(12)		(11)
Provision for Income Taxes(1)	245.9			310.0			317.0			(21)		(2)
Net Income	$	731.6		$	806.6		$	936.3		(9)	%	(14)	%
Percentage of Consolidated Net Income	66		%	60		%	61		%
Average Assets	$	41,176.6		$	36,905.5		$	35,480.0		12	%	4	%

(1) Non-GAAP financial measures stated on an FTE basis.

Wealth Management Net Income

Wealth Management Net Income decreased in 2023, primarily reflecting higher Noninterest Expense, lower Trust, Investment and Other Servicing Fees, lower Net Interest Income, and lower Foreign Exchange Trading Income, partially offset by a lower Provision for Income Taxes.

Wealth Management Trust, Investment and Other Servicing Fees

For an explanation of Wealth Management Trust, Investment, and Other Servicing Fees, please see the “Trust, Investment, and Other Servicing Fees” section within the Consolidated Results of Operations section of the MD&A.

Wealth Management Foreign Exchange Trading Income (Loss)

Foreign Exchange Trading Income for 2023 decreased from 2022, primarily due to an unfavorable impact from foreign exchange swap activity in Treasury that is allocated to Wealth Management.

Wealth Management Other Noninterest Income

Other Noninterest Income for 2023 increased from 2022, primarily due to higher Other Operating Income.

Wealth Management Net Interest Income

Net Interest Income on an FTE basis for 2023 decreased from 2022, primarily attributable to lower deposit balances. Net interest margin on an FTE basis decreased to 2.20% from 2.53%. Average earning assets of $38.3 billion in 2023, increased $4.3 billion, or 13%, from $34.0 billion in 2022. Earning assets and funding sources for the year ended December 31, 2023 were primarily comprised of loans and domestic interest-bearing deposits, respectively.

Wealth Management Provision for Credit Losses

There was a Provision for Credit Losses of $24.0 million for 2023 compared to a Provision for Credit Losses of $9.6 million in 2022. The Provision for Credit Losses during 2023 was primarily due to an increase in the reserve evaluated on a collective basis relating to the commercial real estate portfolio, driven by an increase in the size and duration of the portfolio, weaker economic projections for the industry, methodology updates, and credit quality deterioration on a small number of loans. The Provision for Credit Losses during 2022 reflected an increase in the reserve evaluated on a collective basis driven by weaker economic conditions at the time and portfolio growth, partially offset by improvements in portfolio quality. The 2022 increase in the collective basis reserve was primarily reflected in certain commercial portfolios.

Wealth Management Noninterest Expense

Wealth Management Noninterest Expense, which includes the direct expense of the reporting segment, indirect expense allocations for product and operating support, and indirect expense allocations for certain corporate support services,

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MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

increased in 2023 from 2022. The increase primarily reflects higher expense allocations, Compensation expense, and Other Operating Expense.

Other

Income and expenses associated with non-recurring activities such as certain costs associated with acquisitions, divestitures, litigation, restructuring, and tax adjustments are included within Other. The following table summarizes the results of operations of the Other segment for the years ended December 31, 2023, 2022, and 2021 on a management-reporting basis.

TABLE 26: OTHER RESULTS OF OPERATIONS

	FOR THE YEAR ENDED DECEMBER 31,									CHANGE
($ In Millions)	2023			2022			2021			2023 / 2022	2022 / 2021
Noninterest Income (Loss)	$	(188.4)		$	(235.6)		$	(21.3)		N/M	N/M
Net Interest Income(1)	—			—			—			N/M	N/M
Revenue(1)	(188.4)			(235.6)			(21.3)			N/M	N/M
Noninterest Expense	128.7			74.7			21.8			N/M	N/M
Income (Loss) before Income Taxes(1)	(317.1)			(310.3)			(43.1)			N/M	N/M
Provision (Benefit) for Income Taxes(1)	(18.0)			(77.3)			(10.7)			N/M	N/M
Net Income (Loss)	$	(299.1)		$	(233.0)		$	(32.4)		N/M	N/M
Percentage of Consolidated Net Income (Loss)	(27)		%	(17)		%	(2)		%
Average Assets	$	—		$	—		$	—		N/M	N/M

(1) Non-GAAP financial measures stated on an FTE basis.

Other—Noninterest Income (Loss)

Noninterest Income (Loss) in 2023 primarily reflected an $176.4 million available for sale debt security loss and a $6.9 million available for sale debt security gain recognized in Investment Security Gains (Losses), net, where securities were sold in conjunction with a repositioning of the portfolio. In the prior year, there was a $213.0 million loss recognized in Investment Security Gains (Losses), net arising from an intent to sell available for sale debt securities in conjunction with a repositioning of the portfolio.

Other—Noninterest Expense

Noninterest Expense in 2023 increased from 2022, primarily reflecting an $84.6 million FDIC special assessment and higher non-allocated occupancy expense due to early lease exits on vacant space, partially offset by a $44.1 million pension settlement charge in 2022.

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MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Asset Management

Asset Management, through the Corporation’s various subsidiaries, supports the Asset Servicing and Wealth Management reporting segments by providing a broad range of asset management and related services and other products to clients around the world. Investment solutions are delivered through separately managed accounts, bank common and collective funds, registered investment companies, exchange traded funds, non-U.S. collective investment funds, and unregistered private investment funds. Asset Management’s capabilities include active and passive equity; active and passive fixed income; cash management; multi-asset and alternative asset classes (such as private equity and hedge funds of funds); and multi-manager advisory services and products. Asset Management’s activities also include overlay services and other risk management services. Asset Management operates internationally through subsidiaries and distribution arrangements and its revenue and expense are allocated fully to Asset Servicing and Wealth Management.

At December 31, 2023, Northern Trust managed $1.43 trillion in assets for personal and institutional clients, including $1.03 trillion for Asset Servicing clients and $402.5 billion for Wealth Management clients. The following table presents consolidated AUM as of December 31, 2023, 2022 and 2021 by investment type.

TABLE 27: CONSOLIDATED ASSETS UNDER MANAGEMENT BY INVESTMENT TYPE

	DECEMBER 31,						CHANGE
($ In Billions)	2023		2022		2021		2023 / 2022		2022 / 2021
Equities	$	785.5	$	671.3	$	856.5	17	%	(22)	%
Fixed Income Securities	203.4		186.5		216.1		9		(14)
Cash and Other Assets	278.2		243.4		338.9		14		(28)
Securities Lending Collateral	167.4		148.3		195.6		13		(24)
Total Assets Under Management	$	1,434.5	$	1,249.5	$	1,607.1	15	%	(22)	%

AUM increased at year-end 2023 from year-end 2022. The increase primarily reflected favorable markets, net inflows, and favorable currency translation. The following table presents activity in consolidated AUM by product during the years ended December 31, 2023, 2022 and 2021.

TABLE 28: ACTIVITY IN CONSOLIDATED ASSETS UNDER MANAGEMENT BY PRODUCT

(In Billions)		2023		2022		2021
Balance as of January 1		$	1,249.5	$	1,607.1	$	1,405.3
Inflows by Product
	Equities	206.4		187.7		292.9
	Fixed Income	57.8		48.7		63.7
	Cash and Other Assets	2,012.5		643.2		810.2
	Securities Lending Collateral	238.3		235.3		270.6
Total Inflows		2,515.0		1,114.9		1,437.4
Outflows by Product
	Equities	(224.5)		(231.9)		(321.0)
	Fixed Income	(57.1)		(55.5)		(56.2)
	Cash and Other Assets	(1,970.3)		(743.2)		(745.4)
	Securities Lending Collateral	(219.2)		(282.6)		(261.9)
Total Outflows		(2,471.1)		(1,313.2)		(1,384.5)
Net Inflows (Outflows)		43.9		(198.3)		52.9
Market Performance, Currency & Other
	Market Performance & Other	133.8		(143.0)		159.8
	Currency	7.3		(16.3)		(10.9)
Total Market Performance, Currency & Other		141.1		(159.3)		148.9
Balance as of December 31		$	1,434.5	$	1,249.5	$	1,607.1

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MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

CONSOLIDATED BALANCE SHEET REVIEW

The following tables summarize selected consolidated balance sheet information.

TABLE 29: SELECT CONSOLIDATED BALANCE SHEET INFORMATION

($ In Billions)	DECEMBER 31, 2023		DECEMBER 31, 2022		CHANGE
Assets
Federal Reserve and Other Central Bank Deposits	$	34.3	$	40.0	$	(5.7)	(14)	%
Interest-Bearing Due from and Deposits with Banks(1)	5.3		4.9		0.4		6
Securities Purchased under Agreements to Resell	0.8		1.1		(0.3)		(27)
Total Debt Securities	49.3		51.8		(2.5)		(5)
Loans	47.6		42.9		4.7		11
Other Interest-Earning Assets(2)	3.1		1.8		1.3		77
Total Earning Assets	140.4		142.5		(2.1)		(1)
Total Assets	150.8		155.0		(4.2)		(3)
Liabilities and Stockholders' Equity
Total Interest-Bearing Deposits	93.3		98.6		(5.3)		(5)
Demand and Other Noninterest-Bearing Deposits	22.8		25.3		(2.5)		(10)
Federal Funds Purchased	3.0		1.9		1.1		61
Securities Sold under Agreements to Repurchase	0.8		0.6		0.2		38
Other Borrowings(3)	6.6		7.6		(1.0)		(13)
Total Stockholders’ Equity	11.9		11.3		0.6		6

(1)    Interest-Bearing Due from and Deposits with Banks includes the interest-bearing component of Cash and Due from Banks and Interest-Bearing Deposits with Banks as presented on the consolidated balance sheets.

(2)    Other Interest-Earning Assets includes certain community development investments, collateral deposits with certain securities depositories and clearing houses, Federal Home Loan Bank and Federal Reserve stock, and money market investments which are classified in Other Assets on the consolidated balance sheets.

(3) Other Borrowings primarily includes advances from the Federal Home Loan Bank of Chicago.

TABLE 30: SELECT AVERAGE CONSOLIDATED BALANCE SHEET INFORMATION

	TWELVE MONTHS ENDED DECEMBER 31,
($ In Billions)	2023		2022		CHANGE
Assets
Federal Reserve and Other Central Bank Deposits	$	31.2	$	36.2	$	(5.0)	(14)	%
Interest-Bearing Due from and Deposits with Banks(1)	4.3		4.2		0.1		3
Securities Purchased under Agreements to Resell	1.0		1.1		(0.1)		(11)
Total Debt Securities	49.9		55.0		(5.1)		(9)
Loans	42.2		41.0		1.2		3
Other Interest-Earning Assets(2)	2.2		1.3		0.9		81
Total Earning Assets	130.8		138.8		(8.0)		(6)
Total Assets	142.6		152.6		(10.0)		(6)
Liabilities and Stockholders' Equity
Total Interest-Bearing Deposits	87.5		96.3		(8.8)		(9)
Demand and Other Noninterest-Bearing Deposits	17.7		29.3		(11.6)		(40)
Federal Funds Purchased	5.1		1.4		3.7		N/M
Securities Sold under Agreements to Repurchase	0.4		0.4		—		(7)
Other Borrowings(3)	10.3		5.5		4.8		89
Total Stockholders’ Equity	11.5		11.1		0.4		4

(1)    Interest-Bearing Due from and Deposits with Banks includes the interest-bearing component of Cash and Due from Banks and Interest-Bearing Deposits with Banks as presented on the consolidated balance sheets.

(2)    Other Interest-Earning Assets includes certain community development investments, collateral deposits with certain securities depositories and clearing houses, Federal Home Loan Bank and Federal Reserve stock, and money market investments which are classified in Other Assets on the consolidated balance sheets.

(3) Other Borrowings primarily includes advances from the Federal Home Loan Bank of Chicago.

Average balances are considered to be a better measure of balance sheet trends, as period-end balances can be impacted by the timing of deposit and withdrawal activity involving large client balances. Average earning assets decreased from the

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MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

prior year primarily due to lower client deposits, partially offset by higher borrowing activity, the net of which resulted in lower funding of earning assets.

Select Earning Assets. Average securities decreased from the prior year, reflecting the impact of repositioning. For additional discussion relating to the securities portfolio, refer to the “Asset Quality” section in this MD&A and to Note 4, “Securities” to the consolidated financial statements provided in Item 8, “Financial Statements and Supplementary Data”.

Client Deposits. Average Interest-Bearing Deposits and Demand and Other Noninterest-Bearing Deposits decreased from the prior year as clients migrated into higher yielding products.

Short-Term Borrowings. Short-term borrowings includes Federal Funds Purchased, Securities Sold under Agreements to Repurchase, and Other Borrowings. Securities Sold under Agreements to Repurchase are accounted for as collateralized financings and recorded at the amounts at which the securities were sold plus accrued interest. To minimize any potential credit risk associated with these transactions, the fair value of the securities sold is monitored, limits are set on exposure with counterparties, and the financial condition of counterparties is regularly assessed. Securities Sold under Agreements to Repurchase are held by the counterparty until the repurchase. See Note 24, “Commitments and Contingent Liabilities,” Note 26, “Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repurchase,” and Note 27, “Offsetting of Assets and Liabilities” to the consolidated financial statements provided in Item 8, “Financial Statements and Supplementary Data” for additional information on Northern Trust’s repurchase and reverse repurchase agreements.

Stockholders’ Equity. The increase in average Stockholders’ Equity was primarily due to higher Retained Earnings.    

During the year ended December 31, 2023, the Corporation declared cash dividends totaling $630.2 million to common stockholders and repurchased 4,384,678 shares of common stock, including 378,130 shares withheld to satisfy tax withholding obligations related to share-based compensation, at a total cost of $347.5 million ($79.26 average price per share). During the year ended December 31, 2023, the Corporation declared cash dividends totaling $41.8 million to preferred stockholders.

During the year ended December 31, 2022, the Corporation declared cash dividends totaling $613.0 million to common stockholders and repurchased 311,536 shares of common stock, all of which were shares withheld to satisfy tax withholding obligations related to share-based compensation, at a total cost of $35.4 million ($113.70 average price per share). During the year ended December 31, 2022, the Corporation declared cash dividends totaling $41.8 million to preferred stockholders.

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MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Asset Quality

Securities Portfolio

The following table presents the remaining maturity and average yield of Northern Trust's held to maturity (HTM) debt securities and available for sale (AFS) debt securities by security type as of December 31, 2023. Depending on market conditions, Northern Trust continuously seeks to optimize its securities portfolio, including through purchases and sales of AFS debt securities from time to time.

TABLE 31: REMAINING MATURITY AND AVERAGE YIELD OF HELD TO MATURITY AND AVAILABLE FOR SALE DEBT SECURITIES

	DECEMBER 31, 2023
	TOTAL			ONE YEAR OR LESS			ONE TO FIVE YEARS			FIVE TO TEN YEARS				OVER TEN YEARS			AVERAGE MATURITY
($ in Millions)	BOOK		YIELD	BOOK		YIELD	BOOK		YIELD	BOOK		YIELD		BOOK		YIELD
Held to Maturity Debt Securities
U.S. Government	$	—	—%	$	—	—%	$	—	—%	$	—	—	%	$	—	—%	0 mos.
Obligations of States and Political Subdivisions	2,563.9		3.47	45.7		3.21	1,100.7		3.41	1,126.3		3.41		291.2		3.97	70 mos.
Government Sponsored Agency	9,355.3		2.13	984.3		2.52	3,381.4		2.27	3,248.6		1.94		1,741.0		1.97	75 mos.
Non-U.S. Government	4,789.1		0.72	3,376.0		0.69	1,379.3		0.81	33.8		0.28		—		—	10 mos.
Corporate Debt	646.1		0.76	276.8		0.14	353.7		1.29	15.6		(0.20)		—		—	19 mos.
Covered Bonds	2,208.6		2.61	345.4		2.68	1,623.1		2.64	240.1		2.29		—		—	32 mos.
Certificates of Deposit	585.1		4.37	585.1		4.37	—		—	—		—		—		—	0 mos.
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	5,245.5		1.45	1,080.8		2.17	4,159.0		1.27	5.7		(0.35)		—		—	24 mos.
Other Asset-Backed	214.2		6.91	14.7		5.28	102.0		7.29	97.5		6.76		—		—	62 mos.
Commercial Mortgage-Backed	37.6		6.66	—		—	37.6		6.66	—		—		—		—	41 mos.
Other	576.3		1.63	47.8		1.34	319.0		2.10	30.7		2.30		178.8		0.76	103 mos.
Total Held to Maturity Debt Securities	$	26,221.7	1.96%	$	6,756.6	1.62%	$	12,455.8	1.95%	$	4,798.3	2.38	%	$	2,211.0	2.14%	46 mos.
Available for Sale Debt Securities
U.S. Government	$	3,622.2	3.95%	$	197.8	4.64%	$	3,424.4	3.91%	$	—	—	%	$	—	—%	39 mos.
Obligations of States and Political Subdivisions	295.8		2.07	—		—	106.8		1.97	189.0		2.13		—		—	69 mos.
Government Sponsored Agency	11,553.0		5.51	2,357.0		5.65	5,237.5		5.42	3,282.8		5.65		675.7		5.09	52 mos.
Non-U.S. Government	264.4		0.59	66.1		0.95	198.3		0.48	—		—		—		—	30 mos.
Corporate Debt	279.5		2.82	103.8		2.77	175.7		2.85	—		—		—		—	15 mos.
Covered Bonds	347.1		3.74	89.2		3.03	257.9		3.98	—		—		—		—	27 mos.
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	2,899.9		3.18	277.8		2.08	2,567.1		3.34	55.0		1.43		—		—	34 mos.
Other Asset-Backed	2,962.6		5.03	212.8		2.22	2,631.1		5.18	107.8		6.87		10.9		6.87	37 mos.
Commercial Mortgage-Backed	865.3		4.88	39.3		3.15	708.2		5.31	117.8		2.83		—		—	37 mos.
Total Available for Sale Debt Securities	$	23,089.8	4.73%	$	3,343.8	4.79%	$	15,307.0	4.54%	$	3,752.4	5.36	%	$	686.6	5.12%	44 mos.

Note: Yield is calculated on amortized cost and presented on a taxable equivalent basis giving effect to the applicable federal and state tax rates.

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 59

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Northern Trust maintains a high quality debt securities portfolio. Debt securities not explicitly rated were grouped where possible under the credit rating of the issuer of the security. The following tables provide the fair value of AFS debt securities and amortized cost of HTM debt securities by credit rating.

TABLE 32: FAIR VALUE OF AVAILABLE FOR SALE DEBT SECURITIES BY CREDIT RATING

	AS OF DECEMBER 31, 2023
($ In Millions)	AAA			AA			A			BBB			NOT RATED			TOTAL
U.S. Government	$	3,622.2		$	—		$	—		$	—		$	—		$	3,622.2
Obligations of States and Political Subdivisions	38.1			257.7			—			—			—			295.8
Government Sponsored Agency	11,553.0			—			—			—			—			11,553.0
Non-U.S. Government	264.4			—			—			—			—			264.4
Corporate Debt	24.7			87.0			157.4			—			10.4			279.5
Covered Bonds	325.3			—			21.8			—			—			347.1
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	2,353.5			334.0			212.4			—			—			2,899.9
Other Asset-Backed	2,962.6			—			—			—			—			2,962.6
Commercial Mortgage-Backed	865.3			—			—			—			—			865.3
Total	$	22,009.1		$	678.7		$	391.6		$	—		$	10.4		$	23,089.8
Percent of Total	95		%	3		%	2		%	—		%	—		%	100		%

	AS OF DECEMBER 31, 2022
($ In Millions)	AAA			AA			A			BBB			NOT RATED			TOTAL
U.S. Government	$	2,747.4		$	—		$	—		$	—		$	—		$	2,747.4
Obligations of States and Political Subdivisions	136.4			651.2			—			—			—			787.6
Government Sponsored Agency	11,545.2			—			—			—			—			11,545.2
Non-U.S. Government	360.0			—			—			—			—			360.0
Corporate Debt	302.5			462.6			938.7			19.6			24.2			1,747.6
Covered Bonds	367.0			—			21.7			—			—			388.7
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	1,816.3			451.5			211.6			—			—			2,479.4
Other Asset-Backed	5,256.2			—			—			—			—			5,256.2
Commercial Mortgage-Backed	1,387.8			—			—			—			—			1,387.8
Total	$	23,918.8		$	1,565.3		$	1,172.0		$	19.6		$	24.2		$	26,699.9
Percent of Total	90		%	6		%	4		%	—		%	—		%	100		%

As of both December 31, 2023 and December 31, 2022, the less than 1% of AFS debt securities not rated by Moody’s Investors Service, Inc. (Moody’s), S&P Global Ratings (S&P Global) or Fitch Ratings, Inc. (Fitch Ratings) consisted of corporate debt securities.

TABLE 33: AMORTIZED COST OF HELD TO MATURITY DEBT SECURITIES BY CREDIT RATING

	AS OF DECEMBER 31, 2023
($ In Millions)	AAA			AA			A			BBB			NOT RATED			TOTAL
U.S. Government	$	—		$	—		$	—		$	—		$	—		$	—
Obligations of States and Political Subdivisions	954.7			1,609.0			—			—			0.2			2,563.9
Government Sponsored Agency	9,355.3			—			—			—			—			9,355.3
Non-U.S. Government	813.3			1,179.6			2,463.3			332.9			—			4,789.1
Corporate Debt	2.1			302.6			341.4			—			—			646.1
Covered Bonds	2,208.6			—			—			—			—			2,208.6
Certificates of Deposit	545.9			—			—			—			39.2			585.1
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	4,047.9			1,166.5			30.0			1.1			—			5,245.5
Other Asset-Backed	214.2			—			—			—			—			214.2
Commercial Mortgage-Backed	37.6			—			—			—			—			37.6
Other	54.8			—			—			—			521.5			576.3
Total	$	18,234.4		$	4,257.7		$	2,834.7		$	334.0		$	560.9		$	26,221.7
Percent of Total	70		%	16		%	11		%	1		%	2		%	100		%

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MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

	AS OF DECEMBER 31, 2022
(In Millions)	AAA			AA			A			BBB			NOT RATED			TOTAL
U.S. Government	$	50.0		$	—		$	—		$	—		$	—		$	50.0
Obligations of States and Political Subdivisions	926.8			1,638.5			—			—			—			2,565.3
Government Sponsored Agency	9,407.7			—			—			—			—			9,407.7
Non-U.S. Government	762.2			926.5			1,223.0			322.3			—			3,234.0
Corporate Debt	2.1			305.7			405.5			—			—			713.3
Covered Bonds	2,530.3			—			—			—			—			2,530.3
Certificates of Deposit	—			—			—			—			35.9			35.9
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	4,171.3			1,502.0			28.9			1.1			—			5,703.3
Other Asset-Backed	263.7			—			—			—			—			263.7
Other	65.8			—			—			—			466.8			532.6
Total	$	18,179.9		$	4,372.7		$	1,657.4		$	323.4		$	502.7		$	25,036.1
Percent of Total	73		%	17		%	7		%	1		%	2		%	100		%

As of both December 31, 2023 and December 31, 2022, 2% of HTM debt securities not rated by Moody’s, S&P Global or Fitch Ratings primarily consisted of certificates of deposit with a remaining life of less than six months, as well as investments purchased by Northern Trust to fulfill its obligations under the Community Reinvestment Act (CRA). Northern Trust fulfills its obligations under the CRA by making qualified investments for purposes of supporting institutions and programs that benefit low-to-moderate income communities within Northern Trust’s market area.

Net unrealized losses within the investment securities portfolio totaled $2.3 billion at December 31, 2023, compared to net unrealized losses of $3.2 billion as of December 31, 2022. Net unrealized losses as of December 31, 2023 were comprised of $20.1 million and $2.3 billion of gross unrealized gains and losses, respectively. Net unrealized losses as of December 31, 2022 were comprised of $9.1 million and $3.2 billion of gross unrealized gains and losses, respectively.

As of December 31, 2023, the $23.1 billion AFS debt securities portfolio had unrealized losses of $200.3 million, $105.8 million, and $100.0 million related to government sponsored agency, sub-sovereign, supranational and non-U.S. agency bonds, and other asset-backed, respectively, which are primarily attributable to lower yields and tighter spreads. As of December 31, 2022, the $26.7 billion AFS debt securities portfolio had unrealized losses of $351.6 million, $288.1 million, and $157.6 million related to government-sponsored agency, other asset-backed, and sub-sovereign supranational and non-U.S. agency bonds, respectively, which are primarily attributable to changes in market interest rates and credit spreads since their purchase.

As of December 31, 2023, the $26.2 billion HTM debt securities portfolio had an unrealized loss of $1.0 billion and $294.9 million related to government sponsored agency and sub-sovereign, supranational and non-U.S. agency bonds, respectively, which are primarily attributable to lower yields and tighter spreads. As of December 31, 2022, the $25.0 billion HTM debt securities portfolio had an unrealized loss of $1.1 billion and $436.1 million related to government-sponsored agency and sub-sovereign, supranational and non-U.S. agency bonds, respectively, which are primarily attributable to changes in overall market interest rates and credit spreads since their purchase.

HTM debt securities consist of securities that management intends to, and Northern Trust has the ability to, hold until maturity. During the year ended December 31, 2023, there were no securities transferred from AFS to HTM. During the year ended December 31, 2022, the Corporation transferred government sponsored agency and obligation of states and political subdivisions securities that had a fair value of $6.6 billion from AFS to HTM classification for capital management purposes, all of which were transferred in the third quarter of 2022. Upon transfer of a debt security from the AFS to HTM classification, the amortized cost is reset to fair value. Any net unrealized gain or loss at the date of transfer will remain in Accumulated Other Comprehensive Income (Loss) (AOCI) and be amortized into Net Interest Income over the remaining life of the securities using the effective interest method. The amortization of amounts retained in AOCI will offset the effect on interest income of the amortization of the premium or discount resulting from transferring the securities at fair value.

For additional information relating to the securities portfolio, refer to Note 4, “Securities,” provided in Item 8, “Financial Statements and Supplementary Data.”

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MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Loans

For additional information relating to the loan portfolio, refer to Note 5, “Loans,” and Note 7, “Concentrations of Credit Risk” provided in Item 8, “Financial Statements and Supplementary Data.”

The following table presents the remaining maturity of loans by segment and class as of December 31, 2023.

TABLE 34: REMAINING MATURITY OF LOANS

	DECEMBER 31, 2023
(In Millions)	TOTAL		ONE YEAR OR LESS		ONE TO FIVE YEARS		FIVE TO FIFTEEN YEARS		OVER FIFTEEN YEARS
U.S.:
Commercial
Commercial and Institutional	$	11,555.3	$	4,906.4	$	6,362.2	$	285.8	$	0.9
Commercial Real Estate	5,134.2		787.3		3,439.1		907.8		—
Other	5,944.8		5,944.8		—		—		—
Personal
Private Client	14,360.0		9,170.2		5,060.1		129.4		0.3
Residential Real Estate	6,327.1		260.7		926.8		1,621.2		3,518.4
Other	1,088.3		1,088.3		—		—		—
Total U.S.	$	44,409.7	$	22,157.7	$	15,788.2	$	2,944.2	$	3,519.6
Non-U.S.:
Non-U.S. - Commercial	$	2,778.5	$	2,686.2	$	92.3	$	—	$	—
Non-U.S. - Personal	428.8		316.8		51.9		29.4		30.7
Total Non-U.S.	$	3,207.3	$	3,003.0	$	144.2	$	29.4	$	30.7
Total Loans	$	47,617.0	$	25,160.7	$	15,932.4	$	2,973.6	$	3,550.3

Note: Non-U.S. and Other U.S. loans primarily include short duration exposures related to custodied client investments.

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MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

TABLE 35: INTEREST RATE SENSITIVITY OF LOANS

	DECEMBER 31, 2023
(In Millions)	TOTAL		ONE YEAR OR LESS		ONE TO FIVE YEARS		FIVE TO FIFTEEN YEARS		OVER FIFTEEN YEARS
Fixed Rate:
Commercial
Commercial and Institutional	$	294.5	$	114.3	$	135.8	$	43.5	$	0.9
Commercial Real Estate	180.6		35.1		128.6		16.9		—
Non-U.S.	26.9		26.9		—		—		—
Total Commercial	$	502.0	$	176.3	$	264.4	$	60.4	$	0.9
Personal
Private Client	$	426.1	$	91.7	$	333.7	$	0.5	$	0.2
Residential Real Estate	773.6		70.3		266.2		421.9		15.2
Non-U.S.	9.8		0.1		9.7		—		—
Total Personal	$	1,209.5	$	162.1	$	609.6	$	422.4	$	15.4
Total Fixed Rate	$	1,711.5	$	338.4	$	874.0	$	482.8	$	16.3
Variable Rate:
Commercial
Commercial and Institutional	$	11,260.8	$	4,792.1	$	6,226.4	$	242.3	$	—
Commercial Real Estate	4,953.6		752.2		3,310.5		890.9		—
Non-U.S.	2,751.6		2,659.3		92.3		—		—
Other	5,944.8		5,944.8		—		—		—
Total Commercial	$	24,910.8	$	14,148.4	$	9,629.2	$	1,133.2	$	—
Personal
Private Client	$	13,933.9	$	9,078.5	$	4,726.4	$	128.9	$	0.1
Residential Real Estate	5,553.5		190.4		660.6		1,199.3		3,503.2
Non-U.S.	419.0		316.7		42.2		29.4		30.7
Other	1,088.3		1,088.3		—		—		—
Total Personal	$	20,994.7	$	10,673.9	$	5,429.2	$	1,357.6	$	3,534.0
Total Variable Rate	$	45,905.5	$	24,822.3	$	15,058.4	$	2,490.8	$	3,534.0
Total Loans	$	47,617.0	$	25,160.7	$	15,932.4	$	2,973.6	$	3,550.3

Nonaccrual Assets and 90 Days Past Due Loans

Nonaccrual assets consist of nonaccrual loans and other real estate owned (OREO). OREO is comprised of commercial and residential properties acquired in partial or total satisfaction of loans. Loans that are delinquent 90 days or more and still accruing interest can fluctuate widely at any reporting period based on the timing of cash collections, renegotiation and renewals. For additional information relating to nonaccrual loans, refer to Note 5, “Loans,” provided in Item 8, “Financial Statements and Supplementary Data.”

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 63

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following table presents nonaccrual assets and loans that were delinquent 90 days or more and still accruing interest at December 31, 2023 and 2022.

TABLE 36: NONACCRUAL ASSETS

($ In Millions)	DECEMBER 31, 2023			% OF 2023 NONACCRUAL LOANS TO TOTAL NONACCRUAL LOANS		DECEMBER 31, 2022			% OF 2022 NONACCRUAL LOANS TO TOTAL NONACCRUAL LOANS
Nonaccrual Loans
Commercial
Commercial and Institutional	$	16.3		26	%	$	17.4		38	%
Commercial Real Estate	—			—		10.2			22
Total Commercial	$	16.3		26	%	$	27.6		60	%
Personal
Private Client	$	20.3		32	%	$	—		—	%
Residential Real Estate	27.0			42		18.3			40
Total Personal	$	47.3		74	%	$	18.3		40	%
Total Nonaccrual Loans	63.6					45.9
Other Real Estate Owned	1.5					—
Total Nonaccrual Assets	$	65.1				$	45.9
90 Day Past Due Loans Still Accruing	$	20.1				$	54.2
Nonaccrual Loans to Total Loans	0.13		%			0.11		%
Allowance for Credit Losses Assigned to Loans to Nonaccrual Loans	2.8		x			3.1x

Nonaccrual assets as of December 31, 2023 increased from December 31, 2022, primarily due to one new private client nonaccrual loan and two new residential real estate nonaccrual loans, partially offset by one commercial real estate nonaccrual loan upgrade to accrual status and one commercial real estate nonaccrual loan pay-down/charge-off. In addition to the negative impact on Net Interest Income and the risk of credit losses, nonaccrual assets also increase operating costs due to the expense associated with collection efforts. Changes in the level of nonaccrual assets may be indicative of changes in the credit quality of one or more loan classes. Changes in credit quality impact the allowance for credit losses through the resultant adjustment of the allowance evaluated on an individual basis and the quantitative and qualitative factors used in the determination of the allowance evaluated on a collective basis within the allowance for credit losses.

Allowance for Credit Losses

The Allowance for Credit Losses—which represents management’s best estimate of lifetime expected credit losses related to various portfolios subject to credit risk, off-balance sheet credit exposure, and specific borrower relationships—is determined by management through a disciplined credit review process. Northern Trust measures expected credit losses of financial assets with similar risk characteristics on a collective basis. A financial asset is measured individually if it does not share similar risk characteristics with other financial assets and the related allowance is determined through an individual evaluation.

Management’s estimates utilized in establishing an appropriate level of allowance for credit losses are not dependent on any single assumption. In determining an appropriate allowance level, management evaluates numerous variables, many of which are interrelated or dependent on other assumptions and estimates, and takes into consideration past events, current conditions and reasonable and supportable forecasts.

The results of the credit reserve estimation methodology are reviewed quarterly by Northern Trust’s Credit Loss Reserve Committee, which receives input from Financial Risk Management, Treasury, Corporate Finance, the Economic Research Department, and each of Northern Trust’s reporting business units.

As of December 31, 2023, the Allowance for Credit Losses related to loans, undrawn loan commitments and standby letters of credit, HTM debt securities, and other financial assets, was $178.7 million, $26.9 million, $12.7 million, and $0.9 million, respectively. As of December 31, 2022, the Allowance for Credit Losses related to loans, undrawn loan commitments and standby letters of credit, HTM debt securities, and other financial assets, was $144.3 million, $38.5 million, $16.0 million, and $0.8 million, respectively. For additional information relating to the Allowance for Credit Losses and the changes in the Allowance for Credit Losses during the years ended December 31, 2023 and 2022 due to

64 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

charge-offs, recoveries and provisions for credit losses, refer to Note 6, “Allowance for Credit Losses,” provided in Item 8, “Financial Statements and Supplementary Data.”

The following table shows the net recoveries (charge-offs) to average loans and leases by segment and class at December 31, 2023, 2022, and 2021.

TABLE 37: NET RECOVERIES (CHARGE-OFFS) TO AVERAGE LOANS AND LEASES

($ in Millions)	2023			2022			2021
Net Recoveries (Charge-Offs) to Select Average Loans and Leases(1)
Commercial
Commercial and Institutional	—		%	—		%	0.01		%
Commercial Real Estate	(0.10)			0.05			(0.01)
Lease Financing, net(2)	—			(61.3)			—
Total Commercial	(0.03)			(0.02)			—
Personal
Private Client	—			—			0.01
Residential Real Estate	0.02			0.11			0.07
Total Personal	0.01			0.03			0.03
Total Net Recoveries (Charge-Offs) to Select Average Loans and Leases(1)	(0.01)		%	0.01		%	0.02		%
Net Recoveries (Charge-Offs)
Commercial
Commercial and Institutional	$	0.2		$	0.1		$	0.9
Commercial Real Estate	(5.2)			2.2			(0.3)
Lease Financing, net	—			(4.9)			—
Total Select Commercial(3)	(5.0)			(2.6)			0.6
Personal
Private Client	0.4			—			1.3
Residential Real Estate	1.3			6.8			4.4
Total Personal	1.7			6.8			5.7
Total Net Recoveries (Charge-Offs)(3)	$	(3.3)		$	4.2		$	6.3
Average Loans and Leases
Commercial
Commercial and Institutional	$	12,438.9		$	12,258.9		$	10,428.6
Commercial Real Estate	4,981.6			4,432.2			3,977.0
Lease Financing, net	—			8.0			11.2
Total Select Commercial(1)	17,420.5			16,699.1			14,416.8
Personal
Private Client	14,000.2			13,877.9			13,686.7
Residential Real Estate	6,390.7			6,352.5			6,190.6
Total Select Personal(1)	20,390.9			20,230.4			19,877.3
Total Select Average Loans and Leases(1)	$	37,811.4		$	36,929.5		$	34,294.1

(1) The table excludes the Other and Non-U.S. average loan segments.

(2) The ratio reflects a charge-off in the third quarter of 2022 in association with a sale of the last lease remaining in Northern Trust’s lease portfolio. As of December 31, 2022, there were no leases outstanding.

(3) As of December 31, 2023, there was a $0.5 million net charge-off in other commercial which was not reflected as the segment is excluded from the table above.

Net recoveries (charge-offs) for the Non-U.S. segment was zero and therefore the ratio of net recoveries (charge-offs) to average loans and leases was excluded from the above table. Total average loans and leases for all loan portfolio categories were $42.2 billion, $41.0 billion, and $37.2 billion for the years ended December 31, 2023, 2022, and 2021, respectively.

The following disclosure has been prepared in compliance with the SEC requirement to disclose the Allowance for Credit Losses that is applicable to international operations; however, the amounts disclosed should not be construed as being the only amounts available to cover future non-U.S. loan charge-offs, since the entire Allowance for Credit Losses assigned to Loans is available to absorb losses on both U.S. and non-U.S. loans. In addition, these amounts are not intended to be indicative of future charge-off trends. Please refer to Table 38 in the following section for the non-U.S. allowance balances.

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MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following table provides the allowance evaluated on an individual and collective basis for the loans portfolio by segment and class at December 31, 2023 and 2022.

TABLE 38: ALLOCATION OF THE ALLOWANCE FOR CREDIT LOSSES

	DECEMBER 31,
	2023					2022
($ In Millions)	ALLOWANCE AMOUNT			PERCENT OF LOANS TO TOTAL LOANS		ALLOWANCE AMOUNT			PERCENT OF LOANS TO TOTAL LOANS
Evaluated on an Individual Basis	$	13.4		—	%	$	10.4		—	%
Evaluated on a Collective Basis
Commercial
Commercial and Institutional	57.2			24		57.0			29
Commercial Real Estate	101.4			11		76.5			11
Non-U.S.	1.6			6		8.3			7
Other	0.1			13		0.3			3
Total Commercial	160.3			54		142.1			50
Personal
Private Client	12.0			30		11.2			33
Residential Real Estate	18.8			13		18.0			15
Non-U.S.	1.1			1		1.1			1
Other	—			2		—			1
Total Personal	31.9			46		30.3			50
Total Allowance Evaluated on a Collective Basis	$	192.2				$	172.4
Total Allowance for Credit Losses	$	205.6				$	182.8
Allowance Assigned to:
Loans	$	178.7				$	144.3
Undrawn Commitments and Standby Letters of Credit	26.9					38.5
Total Allowance for Credit Losses	$	205.6				$	182.8
Allowance Assigned to Loans to Total Loans	0.38		%			0.34		%

Allowance Related to Credit Exposure Evaluated on an Individual Basis: The individual allowance is determined through individual evaluations of loans and lending-related commitments that have defaulted, generally those with Borrower Ratings of 8 and 9, that are based on expected future cash flows, the value of collateral, and other factors that may impact the borrower’s ability to pay.

The allowance evaluated on an individual basis for Loans increased $3.0 million from $10.4 million at December 31, 2022 to $13.4 million at December 31, 2023, primarily attributable to a net increase in outstanding loans in the private client portfolio and commercial portfolio.

Allowance Related to Credit Exposure Evaluated on a Collective Basis: Expected credit losses are measured on a collective basis as long as the financial assets included in the respective pool share similar risk characteristics. If financial assets are deemed not to share similar risk characteristics, an individual assessment is warranted.

The allowance evaluated on a collective basis for loans increased $31.4 million to $165.3 million at December 31, 2023, compared with $133.9 million at December 31, 2022, primarily seen in the commercial real estate portfolio, driven by an increase in the size and duration of the portfolio, weaker economic projections for the industry, and methodology updates. The remainder of the provision was due to charge-offs. The allowance evaluated on a collective basis for undrawn loan commitments and letters of credit decreased $11.6 million to $26.9 million at December 31, 2023, compared with $38.5 million at December 31, 2022, primarily in the commercial and institutional portfolio, reflecting a combination of credit quality improvements, an improved macroeconomic outlook for that segment, and methodology updates.

Overall Allowance: The reserve evaluated on an individual and collective basis resulted in a total Allowance for Credit Losses of $220.4 million at December 31, 2023, compared with $200.9 million at the end of 2022. The allowance of $178.7 million assigned to Loans, as a percentage of total Loans, was 0.38% at December 31, 2023, which increased from a $144.3 million allowance assigned to Loans, representing 0.34% of total Loans at December 31, 2022. Allowances assigned to undrawn loan commitments and standby letters of credit totaled $26.9 million and $38.5 million at December 31, 2023 and 2022, respectively, and are included in Other Liabilities on the consolidated balance sheets.

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MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Capital Expenditures

Capital expenditures in 2023 included continued investments in public cloud technologies and to enhance Northern Trust’s software capabilities, as well as renovation and relocation projects to reduce our real estate footprint and modernize our existing offices for new ways of working. Capital expenditures for 2023 totaled $675.8 million, of which $559.3 million was for software, $56.4 million was for computer hardware, $56.0 million was for building and leasehold improvements, and $4.1 million was for furnishings. These capital expenditures principally support, enhance, and protect Northern Trust’s investment management, asset servicing and wealth management systems and capabilities, with focus on delivering secure, highly available and innovative solutions to better serve our clients. Additional capital expenditures committed for technology platforms will result in future expense for the depreciation of hardware and amortization of software. Software amortization and depreciation on computer hardware are charged to Equipment and Software expense. Depreciation on building and leasehold improvements and on furnishings is charged to Occupancy expense and equipment expense, respectively. Capital expenditures for 2022 totaled $723.5 million, of which $594.9 million was for software, $84.0 million was for computer hardware, $35.5 million was for building and leasehold improvements, and $9.1 million was for furnishings.

Deposits

The following table provides the scheduled maturity of total time deposits in denominations of $250,000 or greater at December 31, 2023. For additional information, refer to Note 11, “Deposits,” provided in Item 8, “Financial Statements and Supplementary Data.”

TABLE 39: REMAINING MATURITY OF TIME DEPOSITS $250,000 OR MORE

	DECEMBER 31, 2023
	U.S. OFFICE		NON-U.S. OFFICES
(In Millions)	CERTIFICATES OF DEPOSIT		OTHER TIME		TOTAL
3 Months or Less	$	2,029.4	$	2,557.5	$	4,586.9
Over 3 Months through 6 Months	798.2		22.6		820.8
Over 6 Months through 12 Months	566.4		—		566.4
Over 12 Months	58.0		—		58.0
Total	$	3,452.0	$	2,580.1	$	6,032.1

Deposits not insured by the FDIC as of December 31, 2023 and 2022 totaled $109.9 billion and $116.1 billion, respectively. These deposit amounts are derived by adding estimated U.S. office uninsured deposits as allowed by Federal Financial Institutions Examination Council instructions to all non-U.S. office deposits. Estimated uninsured U.S. office deposits are determined by calculating and totaling the deposits in excess of the deposit insurance limit on an individual account basis.

Short-Term Borrowings

Securities purchased under agreements to resell and securities sold under agreements to repurchase are accounted for as collateralized financings and recorded at the amounts at which the securities were acquired or sold plus accrued interest. To minimize any potential credit risk associated with these transactions, the fair value of the securities purchased or sold is monitored, limits are set on exposure with counterparties, and the financial condition of counterparties is regularly assessed. It is Northern Trust’s policy to take possession, either directly or via third-party custodians, of securities purchased under agreements to resell. Securities sold under agreements to repurchase are either directly held by, or pledged to the counterparty until the repurchase. Northern Trust nets securities sold under agreements to repurchase against those purchased under agreements to resell when the requirements to net are met. See Note 24, “Commitments and Contingent Liabilities,” Note 26, “Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repurchase,” and Note 27, “Offsetting of Assets and Liabilities” provided in Item 8, “Financial Statements and Supplementary Data” for additional information on our repurchase and reverse repurchase agreements.

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MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Geographic Area Information

Northern Trust’s non-U.S. activities are primarily related to its asset servicing, asset management, foreign exchange, cash management, and commercial banking businesses. The operations of Northern Trust are managed on a reporting segment basis and include components of both U.S and non-U.S. source assets. Non-U.S. source assets are not separately identified in Northern Trust’s internal management reporting system. However, Northern Trust is required to disclose non-U.S. activities based on the domicile of the customer. Due to the complex and integrated nature of Northern Trust’s activities, it is difficult to segregate with precision assets between U.S. and non-U.S.-domiciled customers. Therefore, certain subjective estimates and assumptions have been made to allocate assets between U.S. and non-U.S. operations.

The following tables present selected average assets and liabilities attributable to non-U.S. operations (based on the obligor’s domicile) and the percent of those balances to total consolidated average assets. For additional information refer to Note 31, “Reporting Segments and Related Information,” provided in Item 8, “Financial Statements and Supplementary Data.”

TABLE 40: SELECTED AVERAGE ASSETS AND LIABILITIES ATTRIBUTABLE TO NON-U.S. OPERATIONS

(In Millions)	2023		2022
Total Assets	$	24,927.8	$	26,904.3
Time Deposits with Banks	1,847.7		2,082.2
Loans	2,349.5		2,562.7
Non-U.S. Investments	14,565.0		16,002.1
Total Liabilities	67,964.2		77,481.6
Deposits	66,232.9		75,808.6

Non-U.S. Outstandings

As used in this discussion, non-U.S. outstandings are cross-border outstandings as defined by the SEC. They consist of loans, securities, interest-bearing deposits with financial institutions, accrued interest and other monetary assets. Not included are letters of credit, loan commitments, and non-U.S. office local currency claims on residents. Non-U.S. outstandings related to a country are net of guarantees given by third parties resident outside the country and the value of tangible, liquid collateral realizable outside the country. However, transactions with branches of non-U.S. banks are included in these outstandings and are classified according to the country location of the non-U.S. bank’s head office.

Short-term interbank time deposits with non-U.S. banks represent the largest category of non-U.S. outstandings. Northern Trust actively participates in the interbank market with U.S. and non-U.S. banks.

Northern Trust places deposits with non-U.S. counterparties that have strong internal (Northern Trust) risk ratings and external credit ratings. These non-U.S. banks are approved and monitored by Northern Trust’s Capital Markets Credit Committee, which has credit authority for exposure to all non-U.S. banks and approves credit limits. This process includes financial analysis of the non-U.S. banks, use of an internal risk rating system and consideration of external market indicators. Each counterparty is reviewed at least annually and potentially more frequently based on credit fundamentals or general market conditions. Separate from the entity-specific review process, the average life to maturity of deposits with non-U.S. banks is deliberately maintained on a short-term basis in order to respond quickly to changing credit conditions. Northern Trust also utilizes certain risk mitigation tools and agreements that may reduce exposures through use of collateral and/or balance sheet netting. Additionally, the Capital Markets Credit Committee oversees country-risk analyses and imposes limits on country exposure. For additional information refer to Note 31, “Reporting Segments and Related Information,” provided in Item 8, “Financial Statements and Supplementary Data.”

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MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

STATEMENTS OF CASH FLOWS

The following discusses the statement of cash flow activities for the years ended December 31, 2023, 2022, and 2021.

TABLE 41: CASH FLOW ACTIVITY SUMMARY

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Net cash provided by (used in):
Operating activities	$	2,625.6	$	2,392.4	$	1,356.0
Investing activities	4,784.1		25,929.8		(18,602.6)
Financing activities	(7,182.6)		(26,437.4)		16,073.5
Effect of Foreign Currency Exchange Rates on Cash	(89.8)		(287.4)		(159.6)
Change in Cash and Due from Banks	$	137.3	$	1,597.4	$	(1,332.7)

Operating Activities

Net cash provided by operating activities of $2.6 billion for the year ended December 31, 2023 was primarily attributable to period earnings and the impact of other operating activities, net.

For the year ended December 31, 2022, net cash provided by operating activities of $2.4 billion was primarily attributable to period earnings and lower net collateral deposited with derivative counterparties, partially offset by the impact of other operating activities, net.

Investing Activities

Net cash provided by investing activities of $4.8 billion for the year ended December 31, 2023 was primarily attributable to lower levels of deposits with the Federal Reserve and other central banks and net proceeds from available for sale debt securities arising from a repositioning of the portfolio, partially offset by higher levels of loans.

For the year ended December 31, 2022, net cash provided by investing activities of $25.9 billion primarily reflected lower levels of deposits with the Federal Reserve and other central banks and net proceeds from held to maturity debt securities, partially offset by higher levels of loans.

Financing Activities

Net cash used in financing activities of $7.2 billion for the year ended December 31, 2023 was primarily attributable to decreased levels of total deposits. The decrease in total deposits was primarily attributable to lower levels of savings, money market and other interest-bearing.

For the year ended December 31, 2022, net cash used in financing activities of $26.4 billion primarily reflected decreased levels of total deposits, partially offset by higher short-term other borrowings, proceeds from the issuance of 4.00% senior notes and 6.125% subordinated notes, and higher federal funds purchased. The decrease in total deposits was primarily attributable to lower levels of non-U.S. office noninterest-bearing deposits, non-U.S. office interest-bearing deposits, and demand and other noninterest-bearing deposits.

CAPITAL MANAGEMENT

One of Northern Trust’s primary objectives is to maintain a strong capital position to merit the confidence of clients, counterparties, creditors, regulators and stockholders. A strong capital position helps Northern Trust execute its strategies and withstand unforeseen adverse developments.

Senior management, with oversight from the Capital Governance Committee of the Board of Directors and the full Board of Directors, is responsible for capital management and planning. Northern Trust manages its capital on both a total Corporation basis and a legal entity basis. The Capital Committee is responsible for measuring and managing capital metrics against levels set forth within the Capital Policy approved by the Capital Governance Committee of the Board of Directors. In establishing the metrics related to capital, a variety of factors are taken into consideration, including the unique risk profiles of Northern Trust’s businesses, regulatory requirements, capital levels relative to peers, economic and market forecasts, and the impact on credit ratings.

Capital levels increased in 2023 as average stockholders’ equity increased $415.4 million, or 4%, to $11.5 billion. Total stockholders’ equity was $11.9 billion at December 31, 2023, as compared to $11.3 billion at December 31, 2022. Preferred dividends totaling $41.8 million were declared in 2023. During 2023, the Corporation maintained its quarterly common stock dividend at $0.75 per common share. Common dividends totaling $630.2 million were declared in 2023. During the year ended December 31, 2023, the Corporation repurchased 4,384,678 shares of common stock, including 378,130 shares withheld related to share-based compensation, at an average price per share of $79.26.

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MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

In accordance with Basel III requirements, capital ratios are calculated using both the standardized and advanced approaches. As required by the Dodd-Frank Act, the lower of each capital ratio calculated under the standardized approach and the advanced approach serves as the effective ratio for purposes of determining capital adequacy. The following table provides a reconciliation of the Corporation’s common stockholders’ equity to total risk-based capital and its risk-based capital ratios, under the applicable U.S. regulatory rules as of December 31, 2023 and 2022.

TABLE 42: CAPITAL ADEQUACY

($ In Millions)	DECEMBER 31, 2023						DECEMBER 31, 2022
	STANDARDIZED APPROACH			ADVANCED APPROACH			STANDARDIZED APPROACH			ADVANCED APPROACH
Common Equity Tier 1 Capital
Common Stockholders’ Equity	$	11,013.1		$	11,013.1		$	10,374.6		$	10,374.6
Goodwill and Other Intangible Assets, net of Deferred Tax Liability	(722.2)			(722.2)			(719.7)			(719.7)
Other	(111.5)			(111.5)			(115.2)			(115.2)
Total Common Equity Tier 1 Capital	10,179.4			10,179.4			9,539.7			9,539.7
Additional Tier 1 Capital
Preferred Stock	884.9			884.9			884.9			884.9
Other	(40.4)			(40.4)			(27.2)			(27.2)
Total Additional Tier 1 Capital	844.5			844.5			857.7			857.7
Total Tier 1 Capital	11,023.9			11,023.9			10,397.4			10,397.4
Tier 2 Capital
Qualifying Allowance for Credit Losses	219.2			—			199.6			—
Qualifying Subordinated Debt	1,490.8			1,490.8			1,648.5			1,648.5
Total Tier 2 Capital	1,710.0			1,490.8			1,848.1			1,648.5
Total Risk-Based Capital	$	12,733.9		$	12,514.7		$	12,245.5		$	12,045.9
Risk-Weighted Assets(1)	$	89,527.4		$	75,980.0		$	88,107.7		$	83,181.2
Total Assets – End of Period (EOP)	150,783.1			150,783.1			155,036.7			155,036.7
Adjusted Average Fourth Quarter Assets(2)	135,701.9			135,701.9			146,883.8			146,883.8
Total Loans – EOP	47,617.0			47,617.0			42,893.3			42,893.3
Common Stockholders’ Equity to:
Total Loans – EOP	23.13		%	23.13		%	24.19		%	24.19		%
Total Assets – EOP	7.30			7.30			6.69			6.69
Risk-Based Capital Ratios
Common Equity Tier 1 Capital	11.4		%	13.4		%	10.8		%	11.5		%
Tier 1 Capital	12.3			14.5			11.8			12.5
Total Capital (Tier 1 and Tier 2)	14.2			16.5			13.9			14.5
Tier 1 Leverage	8.1			8.1			7.1			7.1
Supplementary Leverage	N/A			8.6			N/A			7.9

(1) Risk-weighted assets exclude, as applicable under each regulatory approach, amounts primarily related to goodwill, certain other intangible assets, and net unrealized gains or losses on securities and reflect adjustments for excess allowances for credit losses that have been excluded from Tier 1 and Tier 2 capital, if any.

(2) Adjusted average fourth quarter assets exclude amounts primarily related to goodwill, other intangible assets, and net unrealized gains or losses on securities.

As of December 31, 2023 and 2022, the Corporation’s capital ratios exceeded the requirements for classification as “well-capitalized” under applicable U.S. regulatory requirements.

Northern Trust is a Category II institution as defined by the Federal Reserve Board which requires us to adhere to regulatory capital standards. In adhering to these standards, Northern Trust engages in a range of reporting and activities with regulators to affirm our financial strength and stability, including but not limited to, capital adequacy reporting that deducts any unrealized losses related to AFS securities from reported capital, and stringent, annual company-run and supervisory stress testing in the form of Comprehensive Capital Analysis and Review (CCAR) exercises, which confirms our ability to remain solvent under severely adverse market conditions.

The results of the 2023 DFAST, published by the Federal Reserve Board on June 28, 2023, resulted in Northern Trust’s stress capital buffer and effective Common Equity Tier 1 capital ratio minimum requirement remaining constant at 2.5% and 7.0%, respectively, for the annual capital plan cycle, which began on October 1, 2023 and continues through September 30, 2024.

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MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

On July 27, 2023, the U.S. banking regulators issued the Basel III Endgame Proposal, which would change how risk-based capital requirements are determined for banking organizations including Northern Trust. The proposal would eliminate the existing advanced approach methodologies for determining RWAs and replace it with a new expanded risk based approach. The new requirements would be phased in over a three year period beginning July 1, 2025. Based on our current understanding of the proposed rule, we estimate that, if the expanded risk-based approach had applied on a fully phased-in basis as of December 31, 2023, and in the absence of taking any actions to mitigate its impact, our expanded risk-based approach RWAs as of that date would have been approximately 5% to 15% higher than our actual standardized approach RWAs as of that date.

Further information regarding the Corporation’s and the Bank’s capital ratios and the minimum requirements for classification as “well-capitalized” is provided in the “Supervision and Regulation—Capital Adequacy Requirements” section of Item 1, “Business,” and Note 32, “Regulatory Capital Requirements,” provided in Item 8, “Financial Statements and Supplementary Data.”

CRITICAL ACCOUNTING ESTIMATES

Our significant accounting policies are described in Note 1, “Summary of Significant Accounting Policies,” provided in Item 8, “Financial Statements and Supplementary Data.” The use of estimates and assumptions is required in the preparation of financial statements in conformity with GAAP and actual results could differ from those estimates. The SEC has issued guidance relating to the disclosure of critical accounting estimates. Critical accounting estimates are those that require management to make subjective or complex judgments about the effect of matters that are inherently uncertain and may change in subsequent periods. Changes that may be required in the underlying assumptions or estimates in these areas could have a material impact on Northern Trust’s future financial condition and results of operations.

For Northern Trust, accounting estimates that are viewed as critical are those relating to the allowance for credit losses and pension plan accounting. Management has discussed the development and selection of each critical accounting estimate with the Audit Committee of the Board of Directors (Audit Committee).

Allowance for Credit Losses

The Allowance for Credit Losses—which represents management’s estimate of lifetime expected credit losses related to various portfolios subject to credit risk, off-balance sheet credit exposure, and specific borrower relationships—is determined by management through a disciplined credit review process. Northern Trust measures expected credit losses of financial assets with similar risk characteristics on a collective basis. The allowance for a financial asset that does not share similar risk characteristics with other financial assets is determined through an individual evaluation.

Management’s estimates utilized in establishing an appropriate level of Allowance for Credit Losses are not dependent on any single assumption. In determining an appropriate allowance level, management evaluates numerous variables, many of which are interrelated or dependent on other assumptions and estimates, and takes into consideration past events, current conditions and reasonable and supportable forecasts. Due to the inherent imprecision in accounting estimates, other estimates or assumptions could reasonably have been used in 2023 and changes in estimates are reasonably likely to occur from period to period.

The Allowance for Credit Losses consists of the following components:

Allowance Evaluated on a Collective Basis. Expected credit losses are measured on a collective basis as long as the financial assets included in the respective pool share similar risk characteristics. If financial assets are deemed not to share similar risk characteristics, an individual assessment is warranted.

The allowance estimation methodology for the collective assessment is based on data representative of the Corporation’s financial asset portfolio from a historical observation period that includes both expansionary and recessionary periods. The estimation methodology and the related qualitative adjustment framework segregate the loan portfolio into segments based on loan and obligor-specific factors, including loan type, borrower type, collateral type, loan size, and borrower credit quality. For each segment, the probability of default and loss given default are derived for each quarter of the remaining life of each instrument. For the first two years (the reasonable and supportable period), these factors are derived by applying quarterly macroeconomic projections using models developed from historical data on macroeconomic factors and loans with similar characteristics. For periods beyond the reasonable and supportable period, Northern Trust reverts to its long-run historical loss experiences on a straight-line basis over four quarters. The projected exposure at default for every quarter is based on contractual balance projections as of each quarter-end, with adjustments made for potential draws on off-balance sheet commitments.

Northern Trust utilizes a quantitative probability of default/loss given default approach for the calculation of its credit allowance on a collective basis. For each segment, the probability of default and the loss given default are applied to the exposure at default for each projected quarter to determine the quantitative component of the allowance. The quantitative allowance is then reviewed within a qualitative adjustment framework, through which management applies judgment by

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assessing internal risk factors, potential limitations in the quantitative methodology, and environmental factors that are not fully contemplated in the forecast to compute an adjustment to the quantitative allowance for each segment and class of the loan portfolio.

ASC 326-20-30 requires the use of projected macroeconomic factors. The Corporation uses multiple forecasts approved by Northern Trust’s Macroeconomic Scenario Development Committee (MSDC). The baseline forecast aligns with the Corporation’s latest thinking on macroeconomic projections for the next eight quarters. An alternative scenario is also considered, which reflects a recession that incorporates the experiences of a wider set of historical economic cycles. The forecasts are probability-weighted at each evaluation period and are management’s best estimate of future economic projections at that time.

The allowance estimate is sensitive to changes in portfolio composition, portfolio quality, and macroeconomic forecasts. Increases in the amount of borrowing and material downgrades to the quality of the lending portfolio will increase the reserve, all else equal. Similarly, deteriorating projections for macroeconomic conditions will increase the reserve. Macroeconomic factors that are particularly correlated to Northern Trust’s loan portfolio are equity market values, market volatility, corporate profits, residential and commercial real estate price indices, unemployment, and disposable income. To demonstrate the sensitivity to changes in macroeconomic conditions, Northern Trust applied a 100% probability weighting to downturn conditions, resulting in an increase to the collective component of the allowance for the loan portfolio of approximately $121.2 million. The investment security and other financial assets portfolios are less sensitive to macroeconomic factors in terms of overall reserve impact due to factors such as high credit quality, short duration, and low historical losses.

The commercial and institutional (C&I) portfolio utilizes Northern Trust’s internal borrower rating assessments to determine initial credit quality. A sensitivity analysis was performed to determine the impact of upgrades or downgrades by shifting the rating up or down by one rating class, assuming no changes to other factors, such as macroeconomic projections or qualitative adjustments. The analysis excludes defaulted loans and does not assume a default event; hence, borrowers at the lowest non-default rating were not downgraded. Similarly, those at the highest rating could not be upgraded. Assuming the final forecast probability weighting, the collective component of the allowance assigned to the C&I portfolio would increase by approximately $82.3 million if all C&I borrowers were downgraded by one performing rating class. The C&I collective allowance would decrease by approximately $32.4 million if borrower ratings were upgraded by one rating class (if possible).

The results of the credit reserve estimation methodology are reviewed quarterly by Northern Trust’s Credit Loss Reserve Committee, which receives input from Financial Risk Management, Treasury, Corporate Finance, the Economic Research Department, and each of Northern Trust’s reporting business units. The Credit Loss Reserve Committee determines the probability weights applied to each forecast approved by MSDC, and also reviews and approves qualitative adjustments to the collective allowance in line with Northern Trust’s qualitative adjustment framework.

Allowance Evaluated on an Individual Basis. The individual allowance is determined through individual evaluations of financial assets that have defaulted, based on expected future cash flows, the value of collateral, and other factors that may impact the borrowers’ ability to pay. For defaulted loans for which the amount of allowance, if any, is determined based on the value of the underlying real estate collateral, third-party appraisals are typically obtained and utilized by management. These appraisals are generally less than twelve months old and are subject to adjustments to reflect management’s judgment as to the realizable value of the collateral.

Analysis and Controls. The quarterly analysis of the individual and collective allowance components and the control process maintained by Financial Risk Management and the lending staff are the principal methods relied upon by management for the timely identification and estimation of individual expected credit losses. In addition to Northern Trust’s own experience, management also considers regulatory guidance. Control processes and analyses employed to determine an appropriate level of allowance for credit losses are reviewed at least annually and modified as considered appropriate.

Management believes that the Allowance for Credit Losses adequately considers these uncertainties and has been established at an appropriate level. Actual losses may vary from current estimates and the amount of the provision for credit losses may be greater or less than actual net charge-offs in any particular period.

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MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Pension Plan Accounting

Northern Trust maintains a noncontributory defined benefit pension plan covering substantially all U.S. employees (U.S. Qualified Plan) and a U.S. noncontributory supplemental pension plan (U.S. Non-Qualified Plan). Certain European-based employees also retain benefits in local defined benefit pension plans, of which the majority are closed to new employees and to future benefit accruals. Measuring cost and reporting liabilities resulting from defined benefit pension plans requires the use of several assumptions regarding future interest rates, asset returns, compensation increases, mortality rates, and other actuarial-based projections relating to the plans. Due to the long-term nature of this obligation and the estimates that are required to be made, the assumptions used in determining the periodic pension expense and the projected benefit obligation are closely monitored and reviewed annually for adjustments that may be required. Pension accounting guidance requires that differences between estimates and actual experience be recognized as other comprehensive income in the period in which they occur. The differences are amortized into net periodic pension expense from accumulated other comprehensive income over the average remaining service period of eligible participants. As a result, differences between the estimates made in the calculation of periodic pension expense and the projected benefit obligation and actual experience affect stockholders’ equity in the period in which they occur but continue to be recognized as expense systematically and gradually over subsequent periods.

Northern Trust recognizes the significant impact that these pension-related assumptions have on the determination of the pension obligations and related expense and has established procedures for monitoring and setting these assumptions each year. These procedures include an annual review of actual demographic and investment experience with the pension plans’ actuaries. In addition to actual experience, adjustments to these assumptions consider observable yields on fixed income securities, known compensation trends and policies, as well as economic conditions and investment strategies that may impact the estimated long-term rate of return on plan assets.

In determining the pension expense for the U.S. Qualified Plan and for the U.S. Non-Qualified Plan in 2023, Northern Trust utilized a discount rate of 5.22% and 5.15% as of December 31, 2022, respectively. For both plans, the rate of increase in the compensation level is based on a graded schedule from 9.00% to 2.50% that averaged 5.56%. The expected long-term rate of return on U.S. Qualified Plan assets was 7.25% as of December 31, 2022.

In evaluating possible revisions to pension-related assumptions for the U.S. pension plans as of Northern Trust’s December 31, 2023 measurement date, the following were considered:

•Discount Rate: Northern Trust estimates the discount rate for its U.S. pension plans by applying the plan specific projected cash flows for future benefit payments for each plan to the Aon AA Above Median yield curve as of the measurement date. This yield curve is composed of individual zero-coupon interest rates for 198 different time periods over a 99-year time horizon. Zero-coupon rates utilized by the yield curve are mathematically derived from observable market yields for AA-rated corporate bonds. This yield curve model referenced by Northern Trust in establishing the discount rate resulted in a rate of 5.03% and 4.95% at December 31, 2023 for the U.S. Qualified and U.S. Non-Qualified Plans, respectively.

•Compensation Level: Based on a review of actual and anticipated salary experience, the compensation scale assumption is based on a graded schedule from 9.00% to 2.50% that averages 5.56%.

•Rate of Return on Plan Assets: The expected return on plan assets is based on an estimate of the long-term (30 years) rate of return on plan assets, which is determined using a building block approach that considers the current asset mix and estimates of return by asset class based on historical experience, giving proper consideration to diversification and rebalancing. Current market factors such as inflation and interest rates are also evaluated before long-term capital market assumptions are determined. Peer data and historical returns are reviewed to check for reasonability and appropriateness. As a result of these analyses, Northern Trust’s rate of return assumption for the U.S. Qualified Plan will continue to be 7.25% for 2024.

•Mortality Table: Northern Trust had adopted the aggregate Pri-2012 mortality table with a 2012 base year, which was released by the Society of Actuaries in October 2019. Northern Trust’s pension obligations reflect proposed future improvement under scale MP-2021, which was released by the Society of Actuaries in October 2021. As was the case in 2022, no change to these assumptions was made in 2023 since the Society of Actuaries did not release any updates to its mortality tables and improvement scales in 2023. Mortality assumptions on lump sum payments remain static and continue to be in line with the IRS prescribed table for minimum lump sums in 2024.

The net pension expense in 2024 is expected to slightly increase, primarily driven by higher amortization of prior year’s asset losses, offset by the positive effects of the cash contribution made to the U.S. Qualified Plan at the beginning of 2024.

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In order to illustrate the sensitivity of these assumptions on the expected U.S pension plans’ 2024 periodic pension expense and the projected benefit obligation as of December 31, 2023, the following table is presented to show the effect of increasing or decreasing each of these assumptions by 25 basis points.

TABLE 43: SENSITIVITY OF U.S. PENSION PLANS ASSUMPTIONS

(In Millions)	25 BASIS POINT INCREASE		25 BASIS POINT DECREASE
Increase (Decrease) in 2024 Pension Expense
Discount Rate Change	$	(2.9)	$	3.0
Compensation Level Change	2.3		(2.3)
Rate of Return on Plan Assets Change	(4.0)		4.0
Increase (Decrease) in December 31, 2023 Projected Benefit Obligation
Discount Rate Change	(32.7)		34.3
Compensation Level Change	9.1		(8.9)

Pension Contributions. The deduction limits specified by the Internal Revenue Code for contributions made by sponsors of defined benefit pension plans are based on a “Target Liability” under the provisions of the Pension Protection Act of 2006. There were no contributions to the U.S. Qualified Plan for the 2023 plan year. $200.0 million was contributed to the U.S. Qualified Plan for the 2024 plan year at the beginning of 2024.

The minimum required contribution to the U.S. Qualified Plan is expected to be zero in 2024. The remaining 2024 maximum deductible contribution, after considering the cash contribution of $200.0 million, is estimated at $220.0 million.

RECENT ACCOUNTING PRONOUNCEMENTS AND DEVELOPMENTS

In March 2023, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2023-02, “Investments—Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method—a consensus of the Emerging Issues Task Force” (ASU 2023-02). The amendments in ASU 2023-02 permit reporting entities to elect to account for their tax equity investments, regardless of the tax credit program from which the income tax credits are received, using the proportional amortization method if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the income tax credits and other income tax benefits received and recognizes the net amortization and income tax credits and other income tax benefits in the income statement as a component of income tax expense (benefit). In addition, ASU 2023-02 requires specific disclosures that must be applied to all investments that generate income tax credits and other income tax benefits from a tax credit program for which the entity has elected to apply the proportional amortization method in accordance with Subtopic 323-740. ASU 2023-02 is effective for interim and annual periods beginning after December 15, 2023. Northern Trust adopted ASU 2023-02 as of January 1, 2024 using the modified retrospective method. The adoption of ASU 2023-02 is not expected to impact significantly Northern Trust’s consolidated balance sheets or consolidated statements of income.

In November 2023, the FASB issued ASU No. 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures” (ASU 2023-07). ASU 2023‐07 significantly expands disclosures about a public entity’s reportable segments, primarily through more frequent and enhanced disclosures about significant segment expenses. ASU 2023-07 does not change how a public entity identifies its operating segments, aggregates those operating segments or applies the quantitative thresholds to determine its reportable segments. ASU 2023-07 is effective for annual periods beginning after December 15, 2023, and interim periods within annual periods beginning after December 15, 2024. Early adoption is permitted. Upon adoption, the impact of ASU 2023-07 will be limited to certain enhancements within the notes to the consolidated financial statements and therefore is not expected to have an impact on Northern Trust’s consolidated balance sheets or consolidated statements of income.

In December 2023, the FASB issued ASU No. 2023-08, “Intangibles—Goodwill and Other—Crypto Assets (Subtopic 350-60): Accounting for and Disclosure of Crypto Assets” (ASU 2023-08). ASU 2023-08 requires entities to subsequently measure certain crypto assets at fair value, with changes in fair value recorded in net income in each reporting period. In addition, ASU 2023-08 requires the presentation of crypto assets separately from other intangible assets on the face of the balance sheet and changes in fair value of crypto assets separately from changes in the carrying amount of other intangible assets on the statement of income. ASU 2023-08 also requires enhanced disclosures about in-scope crypto assets and respective activities. ASU 2023-08 is effective for interim and annual periods beginning after December 15, 2024, although

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early adoption is permitted. Upon adoption, ASU 2023-08 is not expected to have a significant impact on Northern Trust’s consolidated balance sheets or consolidated statements of income.    

In December 2023, the FASB issued ASU No. 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures” (ASU 2023-09). ASU 2023-09 enhances disclosures by further disaggregating existing annual income tax disclosures related to the effective tax rate reconciliation and income taxes paid. ASU 2023-09 is effective for annual periods beginning after December 15, 2024, although early adoption is permitted. Upon adoption, the impact of ASU 2023-09 will be limited to certain enhancements within the notes to the consolidated financial statements and therefore is not expected to have an impact on Northern Trust’s consolidated balance sheets or consolidated statements of income.

RISK MANAGEMENT

Risk Management Overview

Northern Trust employs an integrated risk management framework to enable a risk informed profile and support its business decisions and the execution of its corporate strategies. The framework provides a methodology to identify, manage, report and govern both internal and external risks to Northern Trust, and promotes a culture of risk awareness and good conduct across the organization. Northern Trust’s risk culture encompasses the general awareness, attitude and conduct of employees with respect to risk and the management of risk across all lines of defense within the organization. Northern Trust cultivates a culture of effective risk management by defining and embedding risk management accountabilities in all employee performance expectations and provides training, development and performance rewards to reinforce this culture.

Northern Trust’s risk management framework contains three inter-related elements, designed to support consistent enterprise risk identification, management and reporting: a comprehensive risk inventory, a static taxonomy of risk categories and a dynamic taxonomy of risk themes. The risk inventory is a detailed register of the risks inherently faced by Northern Trust. The risk categories and risk themes are classification systems used for classifying and managing the risk inventory and enabling different risk profile views. All identified risks inherent in Northern Trust’s business activities are cataloged into the following risk categories: credit, operational, fiduciary, compliance, liquidity, market, and strategic risk. All material risks are also dynamically cataloged into various risk themes which are defined groupings that share common characteristics, focus on business outcomes and span across risk categories.

Northern Trust implements its risk management framework through a “three lines of defense” operating model, embedding a robust risk management capability within its businesses. The model, used to communicate risk management expectations across the organization, contains three roles, each with a complementary level of risk management accountability. Within this operating model, Northern Trust’s businesses are the first line of defense for protecting it against the risks inherent in its businesses and are supported by dedicated business risk management teams. The Risk Management function, the second line of defense, sets the direction for Northern Trust’s risk management activities and provides aggregate risk oversight and reporting in support of risk governance. Audit Services, the third line of defense, provides independent assurance as to the effectiveness of the integrated risk framework.

Risk Governance and Oversight Overview

Risk governance is an integral aspect of corporate governance at Northern Trust, and includes clearly defined accountabilities, expectations, internal controls and processes for risk-based decision-making and escalation of issues. The following diagram provides a high-level overview of Northern Trust’s risk governance structure, highlighting oversight by the Board of Directors and key risk-related committees.

TABLE 44: RISK GOVERNANCE STRUCTURE

Northern Trust Corporation Board of Directors
Audit Committee	Business Risk Committee	Capital Governance Committee	Human Capital and Compensation Committee
	–Cybersecurity Risk Oversight Subcommittee

Global Enterprise Risk Committee (GERC)
Credit Risk Committee	Market & Liquidity Risk Committee	Operational Risk Committee	Fiduciary Risk Committee	Compliance & Ethics Oversight Committee	Information Technology Risk Committee	Model Risk Oversight Committee	Workforce Risk Committee

The Board of Directors provides oversight of risk management directly and through certain of its committees: the Audit Committee, the Business Risk Committee, the Capital Governance Committee and the Human Capital and Compensation Committee.

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The Board of Directors annually approves Northern Trust’s Risk Management Framework and Corporate Risk Appetite Statement.

The Audit Committee provides oversight with respect to financial reporting and legal risk.

The Business Risk Committee assumes primary responsibility and oversight with respect to the credit risk, operational risk, fiduciary risk, compliance risk, market risk, liquidity risk, strategic risk, and associated risk themes. The Cybersecurity Risk Oversight Subcommittee is a subcommittee of the Business Risk Committee and assists the Business Risk Committee in discharging its duties with respect to risks related to cybersecurity inherent in Northern Trust’s businesses.

The Human Capital and Compensation Committee oversees the development and operation of Northern Trust’s incentive compensation program. The Committee annually reviews management’s assessment of the effectiveness of the design and performance of Northern Trust’s incentive compensation arrangements and practices in providing incentives that are consistent with Northern Trust’s safety, soundness, and culture. This assessment includes an evaluation of whether Northern Trust’s incentive compensation arrangements and practices discourage inappropriate risk-taking behavior by participants.

The Capital Governance Committee assists the Board of Directors in discharging its oversight duties with respect to capital management and resolution planning activities. Among other responsibilities, the Capital Governance Committee oversees Northern Trust’s capital management assessments, forecasting, and stress testing processes and activities, including the annual CCAR exercise, and challenges management, as appropriate, on various elements of such processes and activities. Accordingly, the Capital Governance Committee provides oversight with respect to Northern Trust’s linkage of material risks to the capital adequacy assessment process.

The Chief Risk Officer (CRO) oversees Northern Trust’s management of risk and compliance, promotes risk awareness and fosters a proactive risk management environment wherein risks inherent in the business strategy are identified, understood, appropriately monitored and mitigated. The CRO reports directly to the Business Risk Committee and the Corporation’s Chief Executive Officer. The CRO regularly advises the Business Risk Committee and reports to the Committee at least quarterly on risk exposures, risk management deficiencies and emerging risks. In accordance with the risk management framework, the Chief Risk Officer, Chief Compliance and Ethics Officer, Head of Financial Risk, Head of Non-Financial Risk, Head of Strategic Risk, Chief Fiduciary Risk Officer, International Chief Risk Officer, Chief Executive Officer, President—Asset Management, President—Asset Servicing, President—Wealth Management, Chief Financial Officer and Chief Information Officer, meet as the Global Enterprise Risk Committee (GERC) to provide executive management oversight and guidance with respect to the management of the categories of risk and risk themes within Northern Trust. The Chief Audit Executive, or such officer’s designee, and the General Counsel, or such officer’s designee, shall be invited to attend each GERC meeting as a non-voting member. All other members of the executive management team of the Corporation will also be standing invitees. Among other risk management responsibilities, GERC receives reports, escalations, or recommendations from senior risk committees that are responsible for the management of risk, and from time to time may delegate responsibility to such committees for risk issues. Senior risk committees include:

The Credit Risk Committee (CRC) establishes and monitors credit-related policies and practices throughout Northern Trust and promotes their uniform application.

The Market & Liquidity Risk Committee (MLRC) oversees activities relating to the management of market and liquidity risks by facilitating a focused review of market and liquidity risk exposures and providing rigorous challenge of related policies, key assumptions, and practices.

The Operational Risk Committee (ORC) provides independent oversight and is responsible for setting the operational risk-related policies and developing and implementing the operational risk management framework and programs that support coordination of operational risk activities.

The Fiduciary Risk Committee (FRC) is responsible for establishing and reviewing the fiduciary risk policies and establishing the fiduciary risk framework, governance and programs that support the coordination of fiduciary risk activities.

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The Compliance & Ethics Oversight Committee (CEOC) provides oversight and direction with respect to compliance policies, implementation of the compliance and ethics program, and the coordination of regulatory compliance initiatives across the Corporation.

The Information Technology Risk Committee (ITRC) provides oversight and direction with respect to information security, technology and cyber risk. The committee is responsible for recommending the policies related to, and overseeing development and implementation of the risk management framework, standards and processes supporting coordination and governance of, information security, technology and cyber risk management activities.

The Model Risk Oversight Committee (MROC) is responsible for providing management attention, direction, and oversight of the model risk management framework and model risk within Northern Trust.

The Workforce Risk Committee (WRC) is responsible for assessing workforce risk and monitoring initiatives associated with workforce risk management.

In addition to the aforementioned committees, Northern Trust establishes business and regional risk committees that also report into GERC.

Risk Assessment, Appetite and Reporting Processes

As part of the integrated risk framework, Northern Trust has established key risk identification and risk management processes, embedded within its businesses to enable a risk-informed profile that supports its business decisions and the execution of its corporate strategies. Northern Trust’s risk assessment process consists of a series of programs across the first and second lines of defense that identify, measure, manage and report risks in line with risk appetite and guidelines.

Northern Trust defines its risk appetite as the aggregate level and types of risk the Board of Directors and senior management are willing to assume to achieve the Corporation’s strategic objectives and business plan, consistent with prudent management of risk and applicable capital, liquidity, and other regulatory requirements. It includes consideration of the likelihood and impact of risks, using both monetary loss and non-financial measures across risk themes to monitor against tolerance thresholds and guideline levels that trigger escalation to risk committees, senior management, and the Board of Directors or committees thereof, as appropriate.

Risk Control

Risk Control is an internal, independent review function within the Risk Management function. Risk Control is managed by the Head of Risk Control and is comprised of Model Risk Management, Credit Review, and Global Compliance Testing groups, each with its own risk focus and oversight. Model Risk Management is responsible for the implementation and management of the enterprise-wide model risk framework and independently validating new models and reviewing and re-validating existing models. Credit Review provides an independent, ongoing assessment of credit exposure and related credit risk management processes across Northern Trust. Lastly, Global Compliance Testing evaluates the effectiveness of procedures and controls designed to comply with relevant laws and regulations, as well as corresponding Northern Trust policies governing regulatory compliance activities. The Business Risk Committee has oversight responsibility with respect to Risk Control generally as well as each of these groups.

Audit Services

Audit Services is an independent control function that assesses and validates controls within Northern Trust’s risk management framework. Audit Services is managed by the Chief Audit Executive with oversight from the Audit Committee. Audit Services tests the overall adequacy and effectiveness of the system of internal controls associated with the framework on an ongoing basis and reports the results of these audits directly to the Audit Committee. Audit Services includes professionals with a broad range of audit and industry experience, including risk management expertise. The Chief Audit Executive reports directly to the Audit Committee and administratively reports to the Corporation’s Chief Executive Officer and is a non-voting member of GERC.

Credit Risk

Credit risk is the risk to interest income or principal from the failure of a borrower, issuer, or counterparty to perform on an obligation.

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Credit Risk Overview

Credit risk is inherent in many of Northern Trust’s activities. The bulk of credit risk relates to loans, securities, and wholesale counterparty-related exposures, such as over-the-counter (OTC) derivatives and securities financing activities. Northern Trust’s loan portfolio differs significantly from those of other large U.S. financial institutions in that Northern Trust is generally:

•not an originator of loan products intended to be sold into a secondary market or to be bundled into asset securitizations;

•not an agent bank or syndicator of loans, where risk management is achieved post-close through the sale of participations; and

•not a participant in leveraged financial transactions, such as project finance, hedge fund leveraging, loans to private equity sponsored companies, or prime brokerage activities.

Credit Risk Framework and Governance

The CRC is the most senior credit committee at Northern Trust, with responsibility for establishing, approving, and monitoring credit-related policies and programs throughout the Bank. The Chief Credit Officer reports directly to the CRO, chairs the CRC, and heads the Credit Risk Management function at Northern Trust.

The Credit Risk Management function is the focal point of the credit risk framework and, while independent of the business units that manage client relationships, it works closely with them to achieve the goal of assuring proactive management of credit risk. To monitor and control credit risk, the Credit Risk Management function maintains a framework that consists of policies, standards, and programs designed to promote a prudent credit culture and monitors adherence to those internal policies, standards, and programs, as well as external regulations. Independent oversight and review of the credit risk framework also is provided by Risk Control.

The credit risk framework stipulates authority levels for approval of the extension of credit. Individual credit authority for commercial and personal loans is limited to specified amounts and maturities. Credit requests exceeding policies or standards because of amount, maturity, rating, or other conditions, are referred to the relevant Group Credit Approval Committee. Credit decisions involving requests in excess of Group Credit Approval Committee limits require the approval of the Senior Credit Committee. The Capital Markets Credit Committee has sole authority for the approval, modification, or renewal of credit exposure limits to all wholesale market counterparties. The Senior Credit Committee and Capital Markets Credit Committee are both direct sub-committees of the CRC. The Treasury Credit Committee provides similar approval for investments in assets subject to credit risk, such as bonds and equities.

Credit Risk Measurement

The credit risk framework covers a number of different measurements of credit risk at Northern Trust, including RWA, the allowance for credit losses, and stress tests using various macroeconomic scenarios, such as the internal capital adequacy approval program and CCAR.

An integral component of credit risk measurement is Northern Trust’s internal risk rating system. Northern Trust’s internal risk rating system enables identification, measurement, approval and monitoring of the Corporation’s credit risk. Calculations include entity-specific information about the obligor’s or counterparty’s probability of default (PD) and exposure-specific information about loss given default (LGD), exposure at default (EAD), and maturity. Northern Trust’s internal risk rating system is intended to rank its credit risk without any direct linkage to external credit ratings.

Obligors are assigned PDs after consideration of both quantitative and qualitative factors. Although the criteria vary, the objective is for assigned PDs to be consistent in the measurement and ranking of risk. LGD and EAD are assigned based on obligor, product, collateral and instrument characteristics.

Risk ratings are assigned at the time a counterparty or an obligation is approved, renewed, or amended. Risk ratings are reviewed annually or when new information relevant to the rating is received. Risk ratings are utilized for credit underwriting, management reporting, and the calculation of regulatory capital.

The Credit Risk Management function is responsible for the ongoing oversight of each model that supports the internal risk-rating system. Independent model governance and oversight is further supported by the activities of Risk Control.

Loans and Other Extensions of Credit

A significant component of credit risk relates to the loan portfolio, including contractual obligations such as legally binding commitments to extend credit, commercial letters of credit, and standby letters of credit. These contractual obligations and arrangements are discussed in Note 24, “Commitments and Contingent Liabilities,” provided in Item 8, “Financial Statements and Supplementary Data.”

Undrawn commitments to extend credit generally have fixed expiration dates or other termination clauses. Since a significant portion of the commitments are expected to expire without being drawn upon, the total commitment amount does not necessarily represent future loans or liquidity requirements. The following table provides information about the industry sector and expiration dates of undrawn commitments to extend credit as of December 31, 2023 and 2022.

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TABLE 45: UNDRAWN COMMITMENTS TO EXTEND CREDIT BY INDUSTRY SECTOR

	DECEMBER 31, 2023								DECEMBER 31, 2022
	COMMITMENTS								COMMITMENTS
(In Millions)	TOTAL		ONE YEAR AND LESS		OVER ONE YEAR		OUTSTANDING LOANS		TOTAL		ONE YEAR AND LESS		OVER ONE YEAR		OUTSTANDING LOANS
Commercial
Commercial and Institutional
Finance and Insurance	$	3,536.8	$	1,664.0	$	1,872.8	$	1,109.3	$	3,394.7	$	1,598.0	$	1,796.7	$	953.8
Holding Companies	—		—		—		28.9		—		—		—		45.0
Manufacturing	6,551.9		1,104.3		5,447.6		1,619.1		6,063.3		764.2		5,299.1		1,855.0
Mining	461.8		29.8		432.0		29.8		499.0		36.8		462.2		60.7
Private Equity	2,740.4		1,888.9		851.5		3,248.9		3,300.1		2,383.3		916.8		4,091.1
Public Administration	50.0		50.0		—		28.1		50.0		50.0		—		13.3
Retail Trade	1,003.8		382.2		621.6		244.2		1,158.2		369.0		789.2		203.7
Services	6,133.1		2,528.1		3,605.0		4,041.7		5,860.6		2,357.7		3,502.9		4,099.0
Transportation and Warehousing	239.9		3.7		236.2		273.2		243.9		—		243.9		251.8
Utilities	1,246.3		8.5		1,237.8		36.8		1,220.7		67.7		1,153.0		8.6
Wholesale Trade	759.2		60.0		699.2		510.4		741.4		118.8		622.6		484.7
Other Commercial	159.7		49.5		110.2		384.9		147.5		89.4		58.1		348.3
Commercial and Institutional(1)	22,882.9		7,769.0		15,113.9		11,555.3		22,679.4		7,834.9		14,844.5		12,415.0
Commercial Real Estate	413.0		58.3		354.7		5,134.2		449.3		124.4		324.9		4,773.0
Non-U.S.
Other Non-US	1,340.4		677.7		662.7		1,543.0		1,562.4		1,046.0		516.4		1,627.9
Private Equity	446.2		446.2		—		1,235.5		575.2		526.5		48.7		1,503.2
Non-U.S.	1,786.6		1,123.9		662.7		2,778.5		2,137.6		1,572.5		565.1		3,131.1
Other	87.5		87.5		—		5,944.8		91.4		91.4		—		1,316.5
Total Commercial	25,170.0		9,038.7		16,131.3		25,412.8		25,357.7		9,623.2		15,734.5		21,635.6
Personal
Private Client	3,876.2		2,033.6		1,842.6		14,360.0		3,970.0		3,090.4		879.6		14,119.0
Residential Real Estate	804.2		251.3		552.9		6,327.1		783.4		125.6		657.8		6,413.5
Non-U.S.	908.7		525.9		382.8		428.8		849.5		800.0		49.5		510.0
Other	—		—		—		1,088.3		—		—		—		215.2
Total Personal	5,589.1		2,810.8		2,778.3		22,204.2		5,602.9		4,016.0		1,586.9		21,257.7
Total	$	30,759.1	$	11,849.5	$	18,909.6	$	47,617.0	$	30,960.6	$	13,639.2	$	17,321.4	$	42,893.3

(1) The commercial and institutional industry sector information is presented on the basis of the North American Industry Classification System (NAICS).

As part of Northern Trust’s credit processes, the Credit Risk Management function oversees a range of portfolio reviews that focus on significant and/or weaker-rated credits. This approach allows management to take remedial action in an effort to deal with potential problems. An integral part of the Credit Risk Management function is a formal review of past due and potential problem loans to determine which credits, if any, need to be placed on nonaccrual status or charged off. Northern Trust maintains a loan portfolio “watch list” for adversely classified credit exposures that includes all nonaccrual credits as well as other loans with elevated risk of default. Independent from the Credit Risk Management function, Credit Review undertakes both on-site and off-site file reviews that evaluate the effectiveness of management’s implementation of Credit Risk Management’s requirements.

Counterparty Credit Risk

Counterparty credit risk for Northern Trust primarily arises from a variety of funding, treasury, trading and custody-related activities, including trading OTC foreign exchange and interest rate derivatives, indemnified securities lending transactions, and sponsored repurchase and reverse repurchase transactions. Credit exposure to counterparties is managed by use of a framework for setting limits by product type and exposure tenor.

To calculate exposure, Northern Trust treats repurchase agreements, reverse repurchase agreements, indemnified securities lending, and sponsored repurchase and reverse repurchase transactions as repo-style transactions. Foreign exchange exposures and interest rate derivatives are treated as OTC derivatives. The exposure at default measurement

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methodology for each eligible type of counterparty credit exposure, including the use of netting and collateral as risk mitigants, is determined based on regulatory requirements.

Credit Risk Mitigation

Northern Trust considers cash flow to be the primary source of repayment for client-related credit exposures. However, Northern Trust employs several different types of credit risk mitigants to manage its overall credit risk in the event cash flow is not sufficient to repay a credit exposure. Northern Trust broadly groups its risk mitigation techniques into the following three primary categories.

Physical and Financial Collateral: One of Northern Trust’s primary credit risk mitigation approaches is the requirement of collateral. Residential and commercial real estate exposures are typically secured by properly margined mortgages on the property. Various other types of physical and financial collateral are also accepted for certain commercial and personal loans, in line with Northern Trust’s lending standards. In cases where loans to clients are secured by marketable securities, the daily values of the securities are monitored closely to ensure adherence to collateral coverage policies.

Netting: On-balance sheet netting is employed where applicable for counterparties with master netting arrangements. Netting is primarily related to foreign exchange transactions with major banks and institutional clients subject to eligible master netting arrangements.

Guarantees: Personal and corporate guarantees are accepted, as warranted, to reduce risk of default, facilitate potential collection efforts, and protect Northern Trust’s claims relative to other creditors.

Another important risk management practice is the avoidance of undue concentrations of exposure, such as in any single (or small number of related) obligor/counterparty, loan type, industry, geography, country or risk mitigant. Processes are in place to establish limits on certain concentrations and the monitoring of adherence to the limits.

Operational Risk

Operational risk is the risk of loss from inadequate or failed internal processes, human factors and systems, or from external events.

Operational Risk Overview

Operational risk is inherent in each of Northern Trust’s businesses and corporate functions and reflects the potential for inadequate information systems, operating problems, challenges related to reliance on third parties, product design and delivery difficulties, potential legal actions or catastrophes to result in losses. This includes the potential that continuity of service and resilience may be impacted.

Operational risk includes information technology and cybersecurity, compliance, fiduciary and legal risks, which under the Corporation’s risk structure are governed and managed explicitly.

Operational Risk Framework and Governance

To monitor and control operational risk, Northern Trust maintains a framework consisting of risk management policies, programs and practices designed to promote a sound operational environment and maintain the Corporation’s operational risk profile and losses within approved risk appetites and guidelines. The framework implements a structured approach to establishing and communicating operational risk management practices and responsibilities. This structured approach to measuring and managing operational risk addresses operational resilience which requires that Northern Trust minimize service disruptions and limit systemic impacts from adverse events as well as risk quantification. The framework is deployed consistently and globally across all businesses and its objective is to identify and measure the factors that influence risk and drive action to maintain operational resilience and reduce future loss events. The Operational Risk Management function operates within the independent Non-Financial Risk function and is responsible for defining the operational risk management framework and providing independent oversight of the framework implementation and application across Northern Trust. It is the responsibility of each business to implement the enterprise-wide operational risk framework and business-specific risk management programs to identify, monitor, measure, manage and report on operational risk and mitigate Northern Trust’s exposure to service disruptions and loss. Several key programs support the operational risk framework, including:

•Loss Event Data Program - a program that collects internal and external loss data for use in monitoring operational risk exposure, various business analyses and the Basel Advanced Measurement Approach (AMA) capital quantification. Both internal and external loss data are used in the operational risk capital quantification. Thresholds

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drive analysis, action and escalation through Northern Trust’s businesses and the Operational Risk Management function.

•Risk and Control Self-Assessment - a comprehensive, structured risk management process used by Northern Trust’s businesses to identify, measure, monitor and mitigate operational risk exposures throughout the enterprise.

•Operational Risk Scenario Analysis - a systematic process of obtaining expert opinions from business managers and risk management experts to derive reasoned assessments of the likelihood of occurrence and the potential loss impact of plausible operational losses.

•Product and Process Risk Management Program - a program used for evaluating and managing risks associated with the introduction of new and modified noncredit products and services and with significant changes to operating processes.

•Operational Resilience - a program designed to ensure the resilience and continuity of service delivery of Northern Trust’s most important business services.

•Third-Party Risk Management Program - a program that provides processes for evaluating, quantifying and qualifying appropriate risk assessment, measurement, monitoring and management of third and fourth parties (inclusive of external and internal, e.g., Northern Trust legal entity to legal entity relationships).

•Global Fraud Risk - a program designed to prevent, detect and respond to attempted or actual fraud impacting the bank and its clients globally.

•Data Management - a program that embeds data management and data governance related activities into Northern Trust processes in order to manage data risk.

•Data Privacy Program - a program that sets forth a consistent, global approach to compliance with all applicable laws, rules, and regulations relating to privacy and establishes overarching principles for the responsible use and protection of confidential information.

•Cyber and Technology Risk Management - a program that sets forth a consistent, global approach to communicate risk management processes and controls addressing cybersecurity (inclusive of information security), technology, and related compliance risks to the organization. Please see Item 1C, “Cybersecurity,” for a detailed discussion of cybersecurity risk management, strategy, and governance.

•Business Continuity Management Program - a program designed to protect life safety, minimize and manage the business impact and support the recovery of critical functions for clients following an incident.

•Physical Security - a program that provides for the life safety of Northern Trust partners, clients, and visitors worldwide by setting and enforcing standards, providing training, establishing partnerships, and encouraging continual improvement in workplace security.

•Insurance Management Program - a program designed to reduce the monetary impact of certain operational loss events through the securing of appropriate insurance policy protection.

As discussed in “Risk Control” above, Model Risk Management also is part of the operational risk framework.

The ORC is responsible for overseeing the activities of Northern Trust related to the management of operational risk including establishing and maintaining the Corporate Operational Risk Management Policy and approving the operational risk framework and programs. This committee has the expanded role of coordinating operational risk issues related to information technology, cybersecurity, compliance and fiduciary risks. The purpose of this committee is to provide executive management’s insight and guidance to the management of existing and emerging operational risks. This includes identification and assessment of evolving risk trends across the operational risk framework and how these can be best managed.

Operational Risk Measurement

Northern Trust utilizes the AMA capital quantification process to estimate required capital for the Corporation and applicable U.S. banking subsidiaries. Northern Trust’s AMA capital quantification process incorporates outputs from the Loss Event Data, Risk and Control Self-Assessment and Operational Risk Scenario Analysis programs to derive required capital. While internal loss data is the foundation for the capital quantification, external loss event data and qualitative risk and control self-assessments are also utilized to inform the creation of scenario analysis data employed in the capital quantification process. Business environment factor information is used to estimate loss frequency. The AMA capital quantification process uses a Loss Distribution Approach methodology to combine frequency and severity distributions to arrive at an estimate of the potential aggregate loss at the 99.9th percentile of the aggregate loss distribution over a one-year time horizon.

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Operational Resilience and Recovery Management

Northern Trust’s operational resilience approach encompasses operational resilience and recovery processes enterprise-wide (including staff, technology and facilities) to anticipate and limit disruptions and to ensure that following a disaster or business interruption Northern Trust is able to resume critical business functions and fulfill all regulatory and legal requirements.

Northern Trust’s operational resilience mitigation and preventative measures include sophisticated physical security, resilient designs and peer capacity for its corporate data centers, a highly redundant global network, robust network security, resilience centers that offer alternative workstations and transfer of work and work-from-home programs that provide further capability.

All of Northern Trust’s businesses are required to risk-assess all of their functions regularly and develop business continuity plans covering resource requirements (people, systems, vendor relationships and other assets), arrangements for obtaining these resources and prioritizing the resumption of each function in compliance with corporate standards. The business continuity programs of all critical third-party vendors to Northern Trust are reviewed on a regular basis. All of Northern Trust’s businesses test their plans at least annually. The ORC annually reviews and presents the corporate business continuity plan to the Business Risk Committee.

Fiduciary Risk

Fiduciary risks are risks arising from the failure: (a) in administering or managing financial and other assets in clients’ fiduciary accounts; (b) to adhere to a fiduciary standard of care if required under the terms of governing documents or applicable laws; or (c) to properly discharge fiduciary duties. Fiduciary status may hinge on the nature of a particular function being performed and fiduciary standards may vary by jurisdiction, type of relationship, and governing document.

Fiduciary Risk Overview

The fiduciary risk management framework identifies, assesses, measures, monitors, and reports on fiduciary risk matters deemed significant. Fiduciary risk is best managed at the source of the risk, and is mitigated through internal controls and risk management practices that are designed to identify, understand, and keep such risk at levels consistent with the organization’s overall risk appetite while also managing the inherent risk in each client relationship for which Northern Trust serves in a fiduciary capacity. Each business is responsible for complying with all corporate policies and external regulations and for establishing specific procedures, standards, and guidelines to manage fiduciary risk within the desired risk appetite.

Fiduciary Risk Framework and Governance

The FRC is responsible for overseeing activities related to the exercise of fiduciary powers throughout the organization, and for establishing and reviewing the fiduciary risk policies and the fiduciary risk framework that supports the coordination of activities to identify, monitor, manage, and report on fiduciary risk. In addition, the FRC serves as an escalation point for significant issues raised by its subcommittees or elsewhere in the organization.

Compliance Risk

Compliance risk is the risk of legal or regulatory sanctions, financial loss, or damage to reputation resulting from failure to comply with laws, regulations, rules, other regulatory requirements, or codes of conduct and other standards of self-regulatory organizations applicable to Northern Trust. Compliance risk includes the following two subcategories:

•Regulatory risk - risk arising from failure to comply with prudential and conduct of business or other regulatory requirements.

•Financial crime risk - risk arising from financial crime (e.g., money laundering, sanctions violations, fraud, insider dealing, theft, etc.) in relation to the products, services, or accounts of the institution, its clients, or others associated with the same.

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Compliance Risk Framework and Governance

The compliance risk management framework identifies, assesses, controls, measures, monitors and reports on compliance risk. The framework is designed to minimize compliance risk and maintain an environment in which criminal or regulatory violations do not occur. The framework includes a comprehensive governance structure and a Compliance and Ethics Program approved by the Business Risk Committee.

Each business is responsible for the implementation and effectiveness of the Compliance and Ethics Program and specific compliance policies within their respective businesses. Each business is responsible for its respective employees’ compliance with corporate policies and external regulations and for establishing specific procedures, standards and guidelines to manage compliance risk in accordance with Northern Trust’s Compliance and Ethics Program.

The Compliance and Ethics Oversight Committee (“CEOC”) oversees and provides direction with respect to the implementation of Northern Trust’s Compliance and Ethics Program and the coordination of compliance initiatives across the enterprise. The CEOC approves policies necessary to effectively manage Regulatory and Financial Crime Risk. The Chief Compliance and Ethics Officer reports to the Business Risk Committee, as appropriate, and chairs the CEOC.

Liquidity Risk Management

Liquidity Risk Overview

Liquidity risk is the risk of not being able to raise sufficient funds or maintain collateral to meet balance sheet and contingent liability cash flow obligations when due, because of firm-specific or market-wide stress events. Northern Trust is a Category II institution as defined by the Federal Reserve Board which requires us to adhere to the same regulatory liquidity standards as U.S. GSIBs. In adhering to these standards, Northern Trust engages in a range of reporting and activities with regulators to affirm our financial strength and stability, including but not limited to, daily Liquidity Coverage Ratio and Net Stable Funding Ratio calculations to regulators.

Northern Trust maintains a strong liquidity position and liquidity risk profile. Northern Trust’s balance sheet is primarily liability-driven. That is, the main driver of balance sheet changes comes from changing levels of client deposits, which are generally related to the level of custody assets serviced and commercial and personal deposits and can also be influenced by market conditions. This liability-driven business model differs from a typical asset-driven business model, where increased levels of deposits and wholesale borrowings are required to support, for example, increased levels of lending. Northern Trust’s balance sheet is generally comprised of high-quality assets that are managed to meet anticipated obligations under stress, resulting in low liquidity risk.

Liquidity Risk Framework and Governance

Northern Trust maintains a liquidity risk framework consisting of risk management policies and practices to keep its risk profile within the Board-approved Corporate Risk Appetite Statement. All liquidity risk activities are overseen by the Risk Management function, which is independent of the businesses undertaking the activities.

The Liquidity Management Policy and exposure limits for liquidity risk are set by the Board of Directors, and committee structures have been established to implement and monitor adherence to corporate policies, external regulations and established procedures. Limits are monitored based on measures such as the LCR, the NSFR, and the liquidity stress-testing buffer across a range of time horizons. Treasury, in the first line of defense, proposes liquidity risk management strategies and is responsible for performing liquidity management activities. The Asset and Liability Management Committee (ALCO) provides first-line management oversight and is responsible for approving strategies and activities within the risk appetite, monitoring risk metrics, overseeing balance sheet resources, and reviewing reporting such as cash flows, LCR, NSFR, and stress test results.

Market and Liquidity Risk Management, in the second line of defense, provides challenge to the first-line activities, evaluates compliance with regulatory requirements and process effectiveness, and escalates material items for corrective action. The Market and Liquidity Risk Committee (MLRC) provides second-line oversight and is responsible for reviewing market and liquidity risk exposures, approving and monitoring risk metrics, and approving key methodologies and assumptions that drive liquidity risk measurement.

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Liquidity Risk Analysis, Monitoring, and Reporting

Liquidity risk is analyzed and monitored in order to ensure compliance with the approved risk appetite. Various liquidity analysis and monitoring activities are employed by Northern Trust to understand better the nature and sources of its liquidity risks, including: liquidity stress testing, liquidity metric monitoring, collateral management, intraday management, cash flow projections, operational deposit modeling, liquid asset buffer measurement, funds transfer pricing, and contingency funding planning.

The liquidity risk management process is supported through management and regulatory reporting. Both Northern Trust’s Treasury and Market and Liquidity Risk Management functions produce management reports that enable oversight bodies to make informed decisions and support management of liquidity risk within the approved risk appetite. Holistic liquidity metrics such as LCR, NSFR and internal liquidity stress testing are actively monitored, along with a suite of other metrics that provide early warning indicators of changes in the risk profile.

Regulatory Environment

Northern Trust actively follows regulatory developments and regularly evaluates its liquidity risk management framework against proposed rule-making and industry best practices in order to comply with applicable regulations and further enhance its liquidity policies. Please refer to “Supervision and Regulation—Liquidity Standards” in Item 1, “Business,” for a discussion of applicable liquidity standards.

U.S. Liquidity Coverage Ratio (LCR)

The LCR Final Rule requires covered banking organizations, which include the Corporation, to maintain an amount of high-quality liquid assets (HQLAs) equal to or greater than 100% of the banking organization’s total net cash outflows over a 30 calendar-day standardized supervisory liquid stress scenario. The requirements of the LCR Final Rule are intended to promote the short-term resilience of the liquidity risk profile of covered banking organizations, improve the banking industry’s ability to absorb shocks arising from financial and economic stress, and improve the measurement and management of liquidity risk. The Corporation and the Bank each satisfied the U.S. liquidity coverage ratio requirements during 2023.

U.S. Net Stable Funding Ratio (NSFR)

The NSFR Final Rule requires covered banking organizations, which include the Corporation, to maintain an amount of available stable funding (ASF) equal to or greater than the banking organization’s projected minimum funding needs, or required stable funding (RSF), over a one-year time horizon. The NSFR is designed to reduce the likelihood that disruptions to a banking organization’s regular sources of funding will compromise its liquidity position, promote effective liquidity risk management, and support the ability of banking organizations to provide financial intermediation to businesses and households across a range of market conditions. The NSFR supports financial stability by requiring banking organizations to fund their activities with stable sources of funding on an ongoing basis, reducing the possibility that funding shocks would substantially increase distress at individual banking organizations. The Corporation and the Bank each satisfied the NSFR requirements during 2023.

Funding

Northern Trust maintains a very liquid balance sheet, with cash and due from banks, deposits with the Federal Reserve and other central banks, short-term money market assets and investment securities in aggregate representing 59% and 63% of total assets as of December 31, 2023 and 2022, respectively. The market value of unencumbered securities at the Bank, which include those placed at the central bank discount window, totaled $39.0 billion and $46.2 billion at December 31, 2023 and 2022, respectively.

As the Corporation’s principal subsidiary encompassing all of Northern Trust’s banking activities, the Bank centrally manages liquidity for all U.S. and international banking operations. Liquidity is provided by a variety of sources, including client deposits (institutional and personal) from the Asset Servicing and Wealth Management businesses, wholesale funding from the capital markets, maturities of short-term investments, interest earned on investment securities and money market assets, Federal Home Loan Bank advances, and unencumbered liquid assets that can be sold or pledged to secure additional funds. While management does not view central bank discount windows as primary sources of liquidity, at December 31, 2023 and 2022, the Bank had over $34.7 billion and $39.0 billion, respectively of securities and loans readily available as collateral to support discount window borrowings. The Bank also is active in the U.S. interbank funding market, providing an important source of additional liquidity and low-cost funds.

The liquidity of the Corporation is managed separately from that of the Bank. The primary sources of cash for the Corporation are issuances of debt or equity and dividend payments from the Bank. For further information on issuances or redemptions of debt or equity, please refer to Note 12, “Senior Notes and Long-Term Debt” provided in Item 8, “Financial Statements and Supplementary Data.” The Corporation received $850.0 million of dividends and no dividends from the

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Bank in 2023 and 2022, respectively. Dividends from the Bank are subject to certain restrictions, as discussed in further detail in Note 30, “Restrictions on Subsidiary Dividends and Loans or Advances,” provided in Item 8, “Financial Statements and Supplementary Data.”

The Corporation’s liquidity, defined as the amount of cash and highly marketable assets, was $795.6 million and $601.4 million at December 31, 2023 and 2022, respectively. During, and at year-end, 2023 and 2022, these assets were comprised almost entirely of cash in a demand deposit account at the Bank or overnight money market placements, both of which were fully available to the Corporation to support its own cash flow requirements or those of its subsidiaries, as needed. Average liquidity during 2023 and 2022 was $797.2 million and $1.2 billion, respectively. The cash flows of the Corporation are shown in Note 33, “Northern Trust Corporation (Corporation only),” provided in Item 8, “Financial Statements and Supplementary Data.”

Uses of Liquidity

Liquidity supports a variety of activities, including client withdrawals, purchases of securities, net loan growth, and draws on commitments to extend credit.

The Corporation’s uses of cash consist mainly of dividend payments to the Corporation’s stockholders; the payment of principal and interest to note holders; repurchases of its common stock; and investments in, or loans to, its subsidiaries. The most significant uses of cash by the Corporation during 2023 were $621.5 million of common stock dividends and $347.5 million of common stock repurchases. The most significant uses of cash by the Corporation during 2022 were $750.2 million of common stock dividends and $35.4 million of common stock repurchases.    

Credit Ratings

A significant source of liquidity for both the Corporation and the Bank is the ability to draw funding from capital markets globally. The credit ratings of the Corporation and the Bank as of December 31, 2023, provided in the following table, allow Northern Trust to access capital markets on favorable terms.

TABLE 46: NORTHERN TRUST CREDIT RATINGS AS OF DECEMBER 31, 2023

	CREDIT RATING
	STANDARD & POOR’S	MOODY’S	FITCH RATINGS
Northern Trust Corporation:
Senior Debt	A+	A2	A+
Subordinated Debt	A	A2	A+
Preferred Stock	BBB+	Baa1	BBB
Outlook	Stable	Stable	Stable
The Northern Trust Company:
Short-Term Deposit	A-1+	P-1	F1+
Long-Term Deposit/Debt	AA-	Aa2	AA
Subordinated Debt	A+	A2	A+
Outlook	Stable	Stable	Stable

A significant downgrade in one or more of these ratings could limit Northern Trust’s access to capital markets and/or increase the rates paid for short-term borrowings, including deposits, and future long-term debt issuances. The size of these rate increases would depend on multiple factors, including the extent of the downgrade, Northern Trust’s relative debt rating compared to other financial institutions, current market conditions, and other factors. In addition, as discussed in Note 27, “Offsetting of Assets and Liabilities,” provided in Item 8, “Financial Statements and Supplementary Data,” Northern Trust enters into certain master netting arrangements with derivative counterparties that contain credit-risk-related contingent features in which the counterparty has the option to declare Northern Trust in default and accelerate cash settlement of net derivative liabilities with the counterparty in the event Northern Trust’s credit rating falls below specified levels. At December 31, 2023, the net maximum amount of these termination payments that Northern Trust could have been required to pay was $52.2 million. Other than these credit-risk-related contingent derivative counterparty payments, Northern Trust had no long-term debt covenants or other credit-risk-related payments at December 31, 2023, that would be triggered by a significant downgrade in its debt ratings.

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Off-Balance Sheet Arrangements

Please refer to Note 24, “Commitments and Contingent Liabilities,” provided in Item 8, “Financial Statements and Supplementary Data” for information on off-balance sheet arrangements and the Credit Risk discussion in the “Risk Management” section for further detail on undrawn commitments.

Market Risk

There are two types of market risk, interest rate risk associated with the banking book and trading risk. Interest rate risk associated with the banking book is the potential for movements in interest rates to cause changes in Net Interest Income and the market value of equity, including Accumulated Other Comprehensive Income (Loss) from the AFS debt securities portfolio. Trading risk is the potential for movements in market variables such as foreign exchange and interest rates to cause changes in the value of trading positions.

Market Risk Framework and Governance

Northern Trust maintains a market risk framework consisting of risk management policies and practices to keep its risk profile within the Board-approved Corporate Risk Appetite Statement. All market risk activities are overseen by the Risk Management function, which is independent of the businesses undertaking the activities.

The Asset and Liability Management Policy, Policy on Dealer Trading Activities, and exposure limits for market risk are set by Board-level committees, and committee structures have been established to implement and monitor adherence to corporate policies, external regulations and established procedures. Limits are monitored based on measures such as sensitivity of Net Interest Income (NII), sensitivity of market value of equity (MVE), and value-at-risk (VaR) across a range of time horizons.

Treasury, in the first line of defense, proposes market risk management strategies and is responsible for performing market risk management activities. The ALCO provides first-line management oversight and is responsible for approving strategies and activities within the risk appetite, monitoring risk metrics, overseeing balance sheet resources, overseeing the execution of strategies, and reviewing reporting such as cash flows, the liquidity coverage ratio and stress test results.

The Market and Liquidity Risk Management function, in the second line of defense, provides challenge to the first-line activities, evaluates compliance with regulatory requirements and process effectiveness, and escalates material items for corrective action. The MLRC provides second-line oversight and is responsible for reviewing market risk exposures, establishing and monitoring risk metrics, and approving key methodologies and assumptions that drive market risk measurement.

Interest Rate Risk Overview

Interest rate risk in the banking book is the potential for deterioration in Northern Trust's financial position (e.g., interest income, market value of equity, or capital) due to changes in interest rates. NII and MVE sensitivity are the primary metrics used for measurement and management of interest rate risk. Changes in interest rates can have a positive or negative impact on NII depending on the positioning of assets, liabilities and off-balance sheet instruments. Changes in interest rates also can impact the values of assets, liabilities and off-balance sheet positions, which directly impact the MVE. Higher interest rates may impact the fair value of available for sale debt securities which in turn affects Accumulated Other Comprehensive Income (Loss) that can impact regulatory capital ratios. To mitigate interest rate risk, the structure of the balance sheet is managed so that movements of interest rates on assets and liabilities (adjusted for hedges) are sufficiently correlated, which allows Northern Trust to manage its interest rate risk within its risk appetite.

There are four commonly recognized types of structural interest rate risk in the banking book:

•repricing risk, which arises from differences in the maturity and repricing terms of assets and liabilities;

•yield curve risk, which arises from changes in the shape of the yield curve;

•basis risk, which arises from imperfect correlation in the adjustment of the rates earned and paid on different financial instruments with otherwise similar repricing characteristics; and

•embedded optionality risk, which arises from client or counterparty behavior in response to interest rate changes.

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Interest Rate Risk Analysis, Monitoring, and Reporting

Northern Trust uses two primary measurement techniques to manage interest rate risk: NII and MVE sensitivity. NII sensitivity provides management with a short-term view of the impact of interest rate changes on NII. MVE sensitivity provides management with a long-term view of interest rate changes on MVE based on the period-end balance sheet.

Northern Trust limits aggregate interest rate risk (as measured by the NII sensitivity and MVE sensitivity simulation techniques) to an acceptable level within the context of risk appetite. A variety of actions may be used to implement risk management strategies to modify interest rate risk including:

•purchase of investment securities;

•sale of investment securities that are classified as available for sale;

•issuance of senior notes and subordinated notes;

•collateralized borrowings from the Federal Home Loan Bank; and

•hedging with various types of derivative financial instruments.

NII Sensitivity

The modeling of NII sensitivity incorporates on-balance sheet positions, as well as derivative financial instruments (principally interest rate swaps) that are used to manage interest rate risk. Northern Trust uses market implied forward interest rates as the base case and measures the sensitivity (i.e., change) of a static balance sheet to changes in interest rates. Stress testing of interest rates is performed to include such scenarios as immediate parallel shocks to rates, nonparallel (i.e., twist) changes to yield curves that result in their becoming steeper or flatter, and changes to the relationship among the yield curves (i.e., basis risk).

The NII sensitivity analysis incorporates certain critical assumptions such as interest rates and client behaviors under changing rate environments. These assumptions are based on a combination of historical analysis and future expected pricing behavior. The simulation cannot precisely estimate NII sensitivity given uncertainty in the assumptions. The following key assumptions are incorporated into the NII simulation:

•the balance sheet size and mix remains constant over the simulation horizon with maturing assets and liabilities replaced with instruments with similar terms as those that are maturing, with the exception of certain nonmaturity deposits that are considered short-term in nature and therefore receive a more conservative interest-bearing treatment;

•prepayments on mortgage loans and securities collateralized by mortgages are projected under each rate scenario using a third-party mortgage analytics system that incorporates market prepayment assumptions;

•cash flows for structured securities are estimated using a third-party vendor in conjunction with the prepayments provided by the third-party mortgage analytics vendor;

•nonmaturity deposit pricing is projected based on Northern Trust’s actual historical patterns and management judgment, depending upon the availability of historical data and current pricing strategies/or judgment; and

•new business rates are based on current spreads to market indices.

The following table shows the estimated NII impact over the next twelve months of 100 and 200 basis point ramps upward and 100 and 200 basis point ramps downward movements in interest rates relative to forward rates as of December 31, 2023 and 2022. Each rate movement is assumed to occur gradually over a one-year period.

TABLE 47: NET INTEREST INCOME SENSITIVITY

INCREASE (DECREASE) ESTIMATED IMPACT ON NEXT TWELVE MONTHS OF NET INTEREST INCOME
(In Millions)	DECEMBER 31, 2023		DECEMBER 31, 2022
INCREASE IN INTEREST RATES ABOVE MARKET IMPLIED FORWARD RATES
100 Basis Points	$	43	$	41
200 Basis Points	82		80
DECREASE IN INTEREST RATES BELOW MARKET IMPLIED FORWARD RATES
100 Basis Points	$	(63)	$	(31)
200 Basis Points	(150)		(64)

The NII sensitivity analysis does not incorporate certain management actions that may be used to mitigate adverse effects of actual interest rate movement. For that reason and others, the estimated impacts do not reflect the likely actual results but serve as estimates of interest rate risk. NII sensitivity is not comparable to actual results disclosed elsewhere or directly predictive of future values of other measures provided.

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MVE Sensitivity

MVE is defined as the present value of assets minus the present value of liabilities, net of the value of financial derivatives that are used to manage the interest rate risk of balance sheet items. The MVE looks at the whole balance sheet, which includes AFS debt securities, HTM debt securities, money market accounts, deposits, loans and wholesale borrowings. The potential effect of interest rate changes on MVE is derived from the impact of such changes on projected future cash flows and the present value of these cash flows and is then compared to the established limit. Northern Trust uses current market rates (and the future rates implied by these market rates) as the base case and measures MVE sensitivity under various rate scenarios. Stress testing of interest rates is performed to include such scenarios as immediate parallel shocks to rates, nonparallel (i.e., twist) changes to yield curves that result in their becoming steeper or flatter, and changes to the relationship among the yield curves (i.e., basis risk).

The MVE sensitivity analysis incorporates certain critical assumptions such as interest rates and client behaviors under changing rate environments. These assumptions are based on a combination of historical analysis and future expected pricing behavior. The simulation cannot precisely estimate MVE sensitivity given uncertainty in the assumptions. Many of the assumptions that apply to NII sensitivity also apply to MVE sensitivity simulations, with the following separate key assumptions incorporated into the MVE simulation:

•the present value of nonmaturity deposits are estimated using dynamic decay methodologies or estimated remaining lives, which are based on a combination of Northern Trust’s actual historical runoff patterns and management judgment—some balances are assumed to be core and have longer lives while other balances are assumed to be temporary and have comparatively shorter lives;

•the present values of most noninterest-bearing balances (such as receivables, equipment, and payables) are the same as their book values; and

•Monte Carlo simulation is used to generate forward interest rate paths.

The following table shows the estimated impact on MVE of 100 and 200 basis point shocks up and 100 and 200 basis point shocks down from current market implied forward rates at December 31, 2023 and 2022. Each rate movement is assumed to occur gradually over a one-year period.

TABLE 48: MARKET VALUE OF EQUITY SENSITIVITY

INCREASE (DECREASE) ESTIMATED IMPACT ON MARKET VALUE OF EQUITY
(In Millions)	DECEMBER 31, 2023		DECEMBER 31, 2022
INCREASE IN INTEREST RATES ABOVE MARKET IMPLIED FORWARD RATES
100 Basis Points	$	(360)	$	(472)
200 Basis Points	(817)		(965)
DECREASE IN INTEREST RATES BELOW MARKET IMPLIED FORWARD RATES
100 Basis Points	$	430	$	596
200 Basis Points	725		842

The MVE simulations do not incorporate certain management actions that may be used to mitigate adverse effects of actual interest rate movements. For that reason and others, the estimated impacts do not reflect the likely actual results but serve as estimates of interest rate risk. MVE sensitivity is not comparable to actual results disclosed elsewhere or directly predictive of future values of other measures provided.

Foreign Currency Market Risk

Foreign Currency Non-Trading Risk Overview

Northern Trust’s balance sheet is exposed to non-trading foreign currency risk as a result of its holdings of non-U.S.-dollar-denominated assets and liabilities, investment in non-U.S. subsidiaries, and future non-U.S.-dollar-denominated revenue and expense. To manage currency exposures on the balance sheet, Northern Trust attempts to match its assets and liabilities by currency. If those currency offsets do not exist on the balance sheet, Northern Trust will use foreign exchange derivative contracts to mitigate its currency exposure.

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Trading Market Risk

Within Market Risk, trading risk arises from providing foreign exchange, interest rate derivatives, and securities brokerage services to clients. Securities positions are limited and their trading risks are de minimis. For regulatory capital purposes, trading risk also includes foreign currency balances from business operations.

Trading Book Composition and Risk Drivers

Northern Trust’s trading book is composed of positions arising from activity in four business areas: Global Foreign Exchange (GFX), which includes Treasury foreign exchange trades; Interest rate derivative (IRD) trades; Northern Trust Securities Inc. (NTSI) inventory; and foreign currency balances (FCBs) accrued on the balance sheet.

GFX desks execute foreign exchange transactions for client accommodation purposes and mitigate most of the exposure via offsetting trades. In addition, Northern Trust’s Treasury department executes foreign exchange transactions to manage balance sheet flows. The risk system includes these within GFX and applies FX and interest rate (IR) drivers to produce VaR for regulatory capital.

Northern Trust’s Treasury Department executes IRD trades for client accommodation purposes and mitigates the exposure via offsetting trades. The risk system applies IR and volatility drivers to produce VaR for regulatory capital.

FCBs arise not from executing trades but rather in the course of regular business operations, from non-U.S.-dollar-denominated revenues and expenses accruing onto the Corporation’s balance sheet. Prior to September 1, 2023, FX risk from these positions were mitigated through hedging activity. This hedging activity was discontinued on September 1, 2023. The risk system applies FX drivers to produce VaR for regulatory capital.

NTSI, a brokerage subsidiary of the Corporation, executes fixed-income securities trades directly for client accounts. A small inventory of securities remains held in inventory overnight. This portfolio exposure is de minimis, and VaR calculations are not required. The valuation of the securities serves as the basis for calculating regulatory capital.

Foreign Currency Trading Risk Overview

Foreign currency or foreign exchange trading positions exist when aggregate obligations to purchase and sell a currency other than the U.S. dollar do not offset each other in amount, or offset each other over different time periods. The GFX trading portfolio at Northern Trust is composed of spot, forward, non-deliverable forward, and foreign exchange rate (FX) swap transactions.

For FCBs, the daily high, low, average, and quarter-end VaR values were all less than $1.5 million for the year ended December 31, 2023.

Interest Rate Derivatives Trading Risk Overview

IRD positions exist when aggregate interest cash inflows and outflows do not offset each other in amount or offset each other over different time periods. The IRD trading portfolio at Northern Trust is composed mostly of interest rate swaps entered into to meet clients’ interest rate risk management needs, but also including a small number of swaptions, caps, and floors. IRD risk measures during the second quarter of 2023 became temporarily inflated as a result of transitions of IRD contracts from LIBOR to SOFR referencing. The risk measures declined in the third quarter of 2023 as the bulk of transitions was completed. For the IRD portfolio, the daily high, low, average, and as of December 31 VaR values were all less than $0.6 million for the year ended December 31, 2023.

Other Non-material Trading Activities

Northern Trust’s broker-dealer subsidiary, NTSI, maintains a portfolio of trading securities held for customer accommodation purposes and invests excess cash balances in short-term investment vehicles. The portfolio averaged $0.5 million and $12.1 million for the year ended December 31, 2023 and 2022, respectively.

Trading Book Risk Measurement

For trading book activities other than NTSI, Northern Trust measures daily the risk of loss associated with all non-U.S. currency positions using a VaR model and applying the historical simulation methodology. This statistical model provides estimates, based on high confidence levels, of the potential loss in value that might be incurred if an adverse shift in interest rates and non-U.S. currency exchange rates were to occur over a small number of days. The model incorporates foreign currency and interest rate volatilities and correlations in price movements among the currencies and interest rates. VaR is computed for each trading desk and for the global portfolio.

VaR measures are computed daily in a vendor software application which reads positions from Northern Trust’s trading systems and foreign currency balances from the general ledger. Data vendors provide foreign exchange rates, interest rates, and volatilities for all currencies. The Risk Management function monitors on a daily basis VaR model inputs and outputs for reasonableness.

Trading Book Risk Monitoring, Reporting and Analysis

Northern Trust monitors several variations of the VaR measures to meet specific regulatory and internal management needs. Variations include different methodologies (historical simulation, Monte Carlo simulation and Taylor

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MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

approximation), horizons of one day and ten days, confidence levels of 95% and 99%, subcomponent VaRs using only FX drivers, only IR drivers, and only volatility drivers, and look-back periods of one year, two years, and four years. Those alternative measures provide management an array of corroborating metrics and alternative perspectives on Northern Trust’s market risks.

Automated daily reports are produced and distributed to business managers and risk managers. The Risk Management function also reviews and reports several variations of the VaR measures in historical time series format to provide management with a historical perspective on risk.

The following table presents the levels of total regulatory VaR and its subcomponents for GFX in the years indicated below, based on the historical simulation methodology, a 99% confidence level, a one-day horizon and equally-weighted volatility. The total VaR for GFX is typically less than the sum of its two subcomponents due to diversification benefits derived from the two subcomponents.

TABLE 49: GLOBAL FOREIGN CURRENCY VALUE-AT-RISK

(In Millions)	TOTAL VaR (FX AND IR DRIVERS)				FX VaR (FX DRIVERS ONLY)				IR VaR (IR DRIVERS ONLY)
FOR THE YEAR ENDED DECEMBER 31,	2023		2022		2023		2022		2023		2022
High	$	0.7	$	0.2	$	0.7	$	0.2	$	0.4	$	0.3
Low	0.1		0.1		—		—		—		—
Average	0.2		0.1		0.1		0.1		0.1		0.1
As of December 31,	0.2		0.1		0.2		0.1		0.1		0.1

During 2023 and 2022, Northern Trust did not incur an actual GFX trading loss in excess of the daily GFX VaR estimate.

Strategic Risk

Strategic risk is the vulnerability of the organization to internal or external developments that render corporate strategy ineffective or unachievable. The consequences of strategic risk can be diminished long-term earnings and capital, as well as reputational damage to the firm. Strategic risk encompasses two main areas:

•Macroeconomic and geopolitical risk centers on external events or developments that would have a detrimental impact on financial markets and/or financial services firms.

•Business risk arises from internal, secular, competitive, or regulatory trends that impact Northern Trust’s stated strategy or its achievability.

Strategic Risk Framework and Governance

The Corporate Strategic Risk Framework has been developed in conjunction with the Corporation’s risk appetite and risk management policies, and defines the mission and expectations of the Strategic Risk Management function to identify and analyze the sources and consequences of strategic risk.

This is achieved through participation in the establishment and review of business line strategy, coordination of risk input to the evaluation of key strategic opportunities, and developing and maintaining a risk inventory and set of metrics which attempt to gauge the level of strategic risk within the organization.

In addition, the Strategic Risk Management function maintains the Global Event Response Program, which aims to anticipate and prepare for stress scenarios, and provide an outline for responding to them when they occur.

Both GERC and the Business Risk Committee are responsible for reviewing the general methods, guidelines and frameworks by which Northern Trust monitors and evaluates strategic risk.

Climate Risk

Climate risk continues to be an evolving strategic risk for the Corporation. Climate risk refers to the risk of loss arising from climate change and is comprised of physical risk, liability risk and transition risk. Physical risk refers to risks to banks and the financial system emanating from the increased severity of extreme weather events (e.g., cyclones, droughts, floods, and fires). It can also refer to longer-term shifts in precipitation and temperature and increased variability in weather patterns (e.g., sea level rise). Liability risk stems from the potential for litigation where institutions and boards do not adequately consider or respond to the impacts of climate change. Transition risk reflects the risks to banks and financial systems of transitioning to a lower-carbon economy that may entail extensive policy, legal, technological, and market changes. Depending on the nature, speed, and focus of these changes, transition risks may pose varying levels of financial and reputational risk to banks and the financial system.

Effective management of climate risk requires coordinated governance, clearly defined roles and responsibilities and well-developed processes to identify, measure, monitor and control risks. We continue to build out and enhance our climate risk management capabilities. Our climate risk management efforts are overseen by the Chief Climate and Sustainability

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MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Risk Officer who reports directly to the CRO. The Risk Management function has created a dedicated climate and sustainability risk unit to monitor, oversee and take account of the increasing impact that climate change has, or may in the future have, on financial risk, nonfinancial risk, and regulatory compliance across the globe. The climate and sustainability risk unit works to evolve the risk management framework to ensure the Corporation meets the expectations of all stakeholders as well as all climate-related commitments made by the Corporation to external agencies.

The Board of Directors, and in particular its Corporate Governance Committee, engages in active oversight of ESG matters of significance to the Corporation and its subsidiaries. In addition, the Business Risk Committee provides oversight of certain financial and operational risks associated with climate change and other environmental factors through its oversight of the Corporation’s global risk management framework and risk management policies. The Business Risk Committee also engages in periodic discussions with management and members of the Risk Management function regarding strategic risks, including climate-related risk.

The Corporation expects that climate change will increasingly impact the risk types it manages, and the Corporation will continue to integrate climate considerations into its risk management framework as its understanding of climate change and risks driven by it evolve. Various regulatory agencies, investors, and other stakeholders have increased expectations and scrutiny in this area. The Corporation is committed to helping mitigate the impacts of climate change related to its activities and to partner with key stakeholders to do the same.

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MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

FORWARD-LOOKING STATEMENTS

This report may include statements which constitute “forward-looking statements” within the meaning of the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Forward-looking statements are identified typically by words or phrases such as “believe,” “expect,” “anticipate,” “intend,” “estimate,” “project,” “likely,” “plan,” “goal,” “target,” “strategy,” and similar expressions or future or conditional verbs such as “may,” “will,” “should,” “would,” and “could.” Forward-looking statements include statements, other than those related to historical facts, that relate to Northern Trust’s financial results and outlook; capital adequacy; dividend policy and share repurchase program; accounting estimates and assumptions; credit quality including allowance levels; future pension plan contributions; effective tax rate; anticipated expense levels; contingent liabilities; acquisitions; strategies; market and industry trends; and expectations regarding the impact of accounting pronouncements and legislation. These statements are based on Northern Trust’s current beliefs and expectations of future events or future results, and involve risks and uncertainties that are difficult to predict and subject to change. These statements are also based on assumptions about many important factors, including:

•financial market disruptions or economic recession in the U.S. or other countries across the globe resulting from any of a number of factors;

•volatility or changes in financial markets, including debt and equity markets, that impact the value, liquidity, or credit ratings of financial assets in general, or financial assets held in particular investment funds or client portfolios, including those funds, portfolios, and other financial assets with respect to which Northern Trust has taken, or may in the future take, actions to provide asset value stability or additional liquidity;

•the impact of equity markets on fee revenue;

•changes in interest rates or in the monetary or other policies of various regulatory authorities or central banks;

•Northern Trust’s success in controlling the costs and expenses of its business operations and the impacts of any broader inflationary environment thereon;

•a decline in the value of securities held in Northern Trust’s investment portfolio, the liquidity and pricing of which may be negatively impacted by periods of economic turmoil and financial market disruptions;

•Northern Trust’s ability to address operating risks, including those related to cybersecurity, data privacy and security, human errors or omissions, pricing or valuation of securities, fraud, operational resilience (including systems performance), failure to maintain sustainable business practices, and breakdowns in processes or internal controls;

•Northern Trust's success in responding to and investing in changes and advancements in technology;

•geopolitical risks, risks related to global climate change and the risks of extraordinary events such as pandemics, natural disasters, terrorist events and war (including the continuing military conflicts involving Ukraine and the Russian Federation and Israel and Hamas and other evolving events in the Middle East), and the responses of the U.S. and other countries to those events;

•unexpected deposit outflows;

•the effectiveness of Northern Trust’s management of its human capital, including its success in recruiting and retaining necessary and diverse personnel to support business growth and expansion and maintain sufficient expertise to support increasingly complex products and services;

•changes in the legal, regulatory and enforcement framework and oversight applicable to financial institutions, including Northern Trust;

•changes in foreign exchange trading client volumes and volatility in foreign currency exchange rates, changes in the valuation of the U.S. dollar relative to other currencies in which Northern Trust records revenue or accrues expenses, and Northern Trust’s success in assessing and mitigating the risks arising from all such changes and volatility;

•a significant downgrade of any of Northern Trust’s debt ratings;

•the health and soundness of the financial institutions and other counterparties with which Northern Trust conducts business;

•uncertainties inherent in the complex and subjective judgments required to assess credit risk and establish appropriate allowances therefor;

•increased costs of compliance and other risks associated with changes in regulation, the current regulatory environment, and areas of increased regulatory emphasis and oversight in the U.S. and other countries, such as anti-money laundering, anti-bribery, and data privacy and security;

•failure to satisfy regulatory standards or to obtain regulatory approvals when required, including for the use and distribution of capital;

•Northern Trust’s success in continuing to enhance its risk management practices and controls and managing risks inherent in its businesses, including credit risk, operational risk, market and liquidity risk, fiduciary risk, compliance risk and strategic risk;

•risks and uncertainties inherent in the litigation and regulatory process, including the possibility that losses may be in excess of Northern Trust’s recorded liability and estimated range of possible loss for litigation exposures;

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•the risk of damage to Northern Trust’s reputation which may undermine the confidence of clients, counterparties, rating agencies, and stockholders;

•the downgrade of U.S. government-issued and other securities;

•changes in tax laws, accounting requirements or interpretations and other legislation in the U.S. or other countries that could affect Northern Trust or its clients;

•the pace and extent of continued globalization of investment activity and growth in worldwide financial assets;

•changes in the nature and activities of Northern Trust’s competition;

•Northern Trust’s success in maintaining existing business and continuing to generate new business in existing and targeted markets and its ability to deploy deposits in a profitable manner consistent with its liquidity requirements;

•Northern Trust’s ability to address the complex needs of a global client base and manage compliance with legal, tax, regulatory and other requirements;

•Northern Trust’s ability to maintain a product mix that achieves acceptable margins;

•Northern Trust’s ability to continue to generate investment results that satisfy clients and to develop an array of investment products;

•uncertainties inherent in Northern Trust’s assumptions concerning its pension plan, including discount rates and expected contributions, returns and payouts;

•risks associated with being a holding company, including Northern Trust’s dependence on dividends from its principal subsidiary; and

•other factors identified elsewhere in this Annual Report on Form 10-K, including those factors described in Item 1A, “Risk Factors,” and other filings with the SEC, all of which are available on Northern Trust’s website.

Actual results may differ materially from those expressed or implied by forward-looking statements. The information contained herein is current only as of the date of that information. All forward-looking statements included in this document are based upon information presently available, and Northern Trust assumes no obligation to update its forward-looking statements.

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SUPPLEMENTAL INFORMATION

Reconciliation to Fully Taxable Equivalent

The following table presents a reconciliation of Interest Income, Net Interest Income, net interest margin, and total revenue prepared in accordance with GAAP to such measures on an FTE basis, which are non-GAAP financial measures. Net interest margin is calculated by dividing annualized Net Interest Income by average interest-earning assets. Management believes this presentation provides a clearer indication of these financial measures for comparative purposes. When adjusted to an FTE basis, yields on taxable, nontaxable and partially taxable assets are comparable; however, the adjustment to an FTE basis has no impact on Net Income.

TABLE 50: RECONCILIATION TO FULLY TAXABLE EQUIVALENT

	FOR THE YEAR ENDED DECEMBER 31,
($ In Millions)	2023			2022			2021
Net Interest Income
Interest Income - GAAP	$	7,325.0		$	2,877.7		$	1,406.5
Add: FTE Adjustment	57.5			45.6			35.6
Interest Income (FTE) - Non-GAAP	$	7,382.5		$	2,923.3		$	1,442.1
Net Interest Income - GAAP	$	1,982.0		$	1,887.2		$	1,382.7
Add: FTE Adjustment	57.5			45.6			35.6
Net Interest Income (FTE) - Non-GAAP	$	2,039.5		$	1,932.8		$	1,418.3
Net Interest Margin - GAAP	1.52		%	1.36		%	0.96		%
Net Interest Margin (FTE) - Non-GAAP	1.56		%	1.39		%	0.99		%
Total Revenue
Total Revenue - GAAP	$	6,773.5		$	6,761.2		$	6,464.5
Add: FTE Adjustment	57.5			45.6			35.6
Total Revenue (FTE) - Non-GAAP	$	6,831.0		$	6,806.8		$	6,500.1

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ITEM 7A – QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

The information called for by this item is incorporated herein by reference to the “Risk Management” section of Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” in this Annual Report on Form 10-K.

ITEM 8 – FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

Report of Independent Registered Public Accounting Firm

To the Stockholders and Board of Directors

Northern Trust Corporation:

Opinion on the Consolidated Financial Statements

We have audited the accompanying consolidated balance sheets of Northern Trust Corporation and subsidiaries (the Corporation) as of December 31, 2023 and 2022, the related consolidated statements of income, comprehensive income, changes in stockholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2023, and the related notes (collectively, the consolidated financial statements). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Corporation as of December 31, 2023 and 2022, and the results of its operations and its cash flows for each of the years in the three-year period ended December 31, 2023, in conformity with U.S. generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Corporation’s internal control over financial reporting as of December 31, 2023, based on criteria established in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission, and our report dated February 27, 2024 expressed an unqualified opinion on the effectiveness of the Corporation’s internal control over financial reporting.

Basis for Opinion

These consolidated financial statements are the responsibility of the Corporation’s management. Our responsibility is to express an opinion on these consolidated financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Corporation in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. We believe that our audits provide a reasonable basis for our opinion.

Critical Audit Matter

The critical audit matter communicated below is a matter arising from the current period audit of the consolidated financial statements that was communicated or required to be communicated to the audit committee and that: (1) relates to accounts or disclosures that are material to the consolidated financial statements and (2) involved our especially challenging, subjective, or complex judgments. The communication of a critical audit matter does not alter in any way our opinion on the consolidated financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion on the critical audit matter or on the accounts or disclosures to which it relates.

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Assessment of the allowance for credit losses for commercial loans evaluated on a collective basis

As discussed in Notes 1 and 6 to the consolidated financial statements, the Corporation’s allowance for credit losses for commercial loans evaluated on a collective basis (the collective ACL) was $135.4 million of a total allowance for credit losses assigned to loans of $178.7 million as of December 31, 2023. Expected credit losses are measured on a collective basis as long as the financial assets included in the respective pool share similar risk characteristics. The allowance estimation methodology for the collective assessment is based on data representative of the Corporation’s financial asset portfolio from a historical observation period that includes both expansionary and recessionary periods. The estimation methodology and the related qualitative adjustment framework segregate the loan portfolio into segments based on loan and obligor specific factors, including loan type, borrower type, collateral type, loan size, and borrower credit quality. The estimation methodology applies probability of default and loss given default assumptions to the projected exposure at default on a pool basis. For each segment, the probability of default (PD) and loss given default (LGD) are derived for each quarter of the remaining life of each instrument. For the first two years (the reasonable and supportable period), these factors are derived by applying quarterly macroeconomic projections using models developed from historical data on macroeconomic factors and loans with similar factors, including the borrower rating assigned to individual obligors, as applicable. For periods beyond the reasonable and supportable period, the Corporation reverts to its own long-run historical loss experience on a straight-line basis over four quarters. The projected exposure at default for every quarter is based on contractual balance projections as of each quarter-end. Estimating expected lifetime credit losses requires the consideration of the effect of future economic conditions. The Corporation employs multiple scenarios over a reasonable and supportable period to project future conditions. The Corporation determines the probability weights assigned to each scenario at each quarter-end. The quantitative allowance is then reviewed within the qualitative adjustment framework, through which the Corporation applies judgment by assessing internal risk factors, potential limitations in the quantitative methodology, and environmental factors that are not fully contemplated in the forecast to compute adjustments to the quantitative allowance that may impact individual or multiple segments of the loan portfolio.

We identified the assessment of the quantitative component of the collective ACL as a critical audit matter. A high degree of audit effort, including specialized skills and knowledge, and subjective and complex auditor judgment was involved in the assessment of the quantitative component of the collective ACL due to significant measurement uncertainty. Specifically, the assessment encompassed the evaluation of the quantitative component of the collective ACL methodology, including the methods and models used to estimate the PD and LGD and their significant assumptions, the multiple economic forecast scenarios and macroeconomic factors and their respective weightings, and borrower ratings for certain commercial loans. In addition, auditor judgment was required to evaluate the sufficiency of audit evidence obtained.

The following are the primary procedures we performed to address this critical audit matter. We evaluated the design and operating effectiveness of certain internal controls related to the critical audit matter. This included controls related to the Corporation’s measurement of the quantitative component of the collective ACL estimate, including controls over:

•development of the quantitative component of the collective ACL methodology

•development, calibration and/or performance monitoring of certain PD and LGD models

•development and approval of the multiple economic forecast scenarios, macroeconomic factors and their respective weightings

•identification and determination of the significant assumptions used in certain PD and LGD models

•analysis of the allowance for credit losses for loans results.

We evaluated the Corporation’s process to develop the quantitative component of the collective ACL estimate by testing certain sources of data, factors, and assumptions that the Corporation used, and considered the relevance and reliability of such data, factors and assumptions. In addition, we involved credit risk professionals with specialized skills and knowledge, who assisted in:

•evaluating the quantitative component of the Corporation’s collective ACL methodology for compliance with U.S. generally accepted accounting principles

•evaluating judgments made by the Corporation relative to the development, calibration and/or performance monitoring of certain PD and LGD models

•assessing the conceptual soundness and performance testing of certain PD and LGD models by inspecting model documentation to determine whether the models were suitable for their intended use

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•assessing the economic forecast scenarios, the economic input variables and their respective weightings through comparison to publicly available forecasts and the Corporation’s business environment

•testing individual borrower ratings for a selection of commercial loan relationships by evaluating the financial performance of the borrower, sources of repayment, and any relevant guarantees or underlying collateral.

We also assessed the sufficiency of the audit evidence obtained related to the quantitative component of the collective ACL by evaluating the:

•cumulative results of the procedures

•qualitative aspects of the Corporation’s accounting practices

•potential bias in the accounting estimate

We have served as the Corporation’s auditor since 2002.

Chicago, Illinois

February 27, 2024

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CONSOLIDATED FINANCIAL STATEMENTS

CONSOLIDATED BALANCE SHEETS

	DECEMBER 31,
(In Millions Except Share Information)	2023		2022
ASSETS
Cash and Due from Banks	$	4,791.5	$	4,654.2
Federal Reserve and Other Central Bank Deposits	34,326.2		40,030.4
Interest-Bearing Deposits with Banks	1,939.0		1,941.1
Federal Funds Sold	—		32.0
Securities Purchased under Agreements to Resell	784.7		1,070.3
Debt Securities
Available for Sale (Amortized cost of $23,659.0 and $27,760.0)	23,089.8		26,699.9
Held to Maturity (Fair value of $24,473.0 and $22,879.3)	26,221.7		25,036.1
Trading Account	—		95.2
Total Debt Securities	49,311.5		51,831.2
Loans
Commercial	25,412.8		21,635.6
Personal	22,204.2		21,257.7
Total Loans (Net of unearned income of $5.9 and $9.0)	47,617.0		42,893.3
Allowance for Credit Losses	(192.3)		(161.1)
Buildings and Equipment	502.2		500.5
Client Security Settlement Receivables	212.6		1,698.3
Goodwill	702.3		691.3
Other Assets	10,788.4		9,855.2
Total Assets	$	150,783.1	$	155,036.7
LIABILITIES
Deposits
Demand and Other Noninterest-Bearing	$	14,246.4	$	16,582.7
Savings, Money Market and Other Interest-Bearing	25,252.1		31,128.6
Savings Certificates and Other Time	4,109.7		1,981.3
Non U.S. Offices — Noninterest-Bearing	8,584.7		8,757.6
— Interest-Bearing	63,971.1		65,481.9
Total Deposits	116,164.0		123,932.1
Federal Funds Purchased	3,045.4		1,896.9
Securities Sold Under Agreements to Repurchase	784.7		567.2
Other Borrowings	6,567.8		7,592.3
Senior Notes	2,773.2		2,724.2
Long-Term Debt	4,065.0		2,066.2
Other Liabilities	5,485.1		4,998.3
Total Liabilities	138,885.2		143,777.2
STOCKHOLDERS' EQUITY
Preferred Stock, No Par Value; Authorized 10,000,000 shares:
Series D, authorized and outstanding shares of 5,000	493.5		493.5
Series E, authorized and outstanding shares of 16,000	391.4		391.4
Common Stock, $1.66 2/3 Par Value; Authorized 560,000,000 shares; Outstanding shares of 205,126,224 and 208,428,309	408.6		408.6
Additional Paid-In Capital	1,009.6		983.5
Retained Earnings	14,233.8		13,798.5
Accumulated Other Comprehensive Loss	(1,137.9)		(1,569.2)
Treasury Stock (40,045,300 and 36,743,215 shares, at cost)	(3,501.1)		(3,246.8)
Total Stockholders’ Equity	11,897.9		11,259.5
Total Liabilities and Stockholders’ Equity	$	150,783.1	$	155,036.7

See accompanying notes to consolidated financial statements on pages 102-171.

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CONSOLIDATED FINANCIAL STATEMENTS

CONSOLIDATED STATEMENTS OF INCOME

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions Except Share Information)	2023		2022		2021
Noninterest Income
Trust, Investment and Other Servicing Fees	$	4,361.8	$	4,432.6	$	4,361.1
Foreign Exchange Trading Income	203.9		288.6		292.6
Treasury Management Fees	31.6		39.3		44.3
Security Commissions and Trading Income	135.0		136.2		140.2
Other Operating Income	228.7		191.3		243.9
Investment Security Gains (Losses), net	(169.5)		(214.0)		(0.3)
Total Noninterest Income	4,791.5		4,874.0		5,081.8
Net Interest Income
Interest Income	7,325.0		2,877.7		1,406.5
Interest Expense	5,343.0		990.5		23.8
Net Interest Income	1,982.0		1,887.2		1,382.7
Provision for (Release of) Credit Losses	24.5		12.0		(81.5)
Net Interest Income after Provision for Credit Losses	1,957.5		1,875.2		1,464.2
Noninterest Expense
Compensation	2,321.8		2,248.0		2,011.0
Employee Benefits	405.2		437.4		431.4
Outside Services	906.5		880.3		849.4
Equipment and Software	945.5		838.8		736.3
Occupancy	232.3		219.1		208.7
Other Operating Expense	472.9		359.3		299.1
Total Noninterest Expense	5,284.2		4,982.9		4,535.9
Income before Income Taxes	1,464.8		1,766.3		2,010.1
Provision for Income Taxes	357.5		430.3		464.8
NET INCOME	$	1,107.3	$	1,336.0	$	1,545.3
Preferred Stock Dividends	41.8		41.8		41.8
Net Income Applicable to Common Stock	$	1,065.5	$	1,294.2	$	1,503.5
PER COMMON SHARE
Net Income – Basic	$	5.09	$	6.16	$	7.16
– Diluted	5.08		6.14		7.14
Average Number of Common Shares Outstanding – Basic	207,248,094		208,309,331		208,075,522
– Diluted	207,563,746		208,867,264		208,899,230

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Net Income	$	1,107.3	$	1,336.0	$	1,545.3
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)
Net Unrealized Gains (Losses) on Available for Sale Debt Securities	443.7		(1,474.7)		(534.7)
Net Unrealized Gains (Losses) on Cash Flow Hedges	(0.4)		3.6		0.8
Net Foreign Currency Adjustments	39.0		9.4		10.5
Net Pension and Other Postretirement Benefit Adjustments	(51.0)		(71.9)		59.8
Other Comprehensive Income (Loss)	431.3		(1,533.6)		(463.6)
Comprehensive Income (Loss)	$	1,538.6	$	(197.6)	$	1,081.7

See accompanying notes to consolidated financial statements on pages 102-171.

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 99

CONSOLIDATED FINANCIAL STATEMENTS

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY

(In Millions Except Per Share Information)	PREFERRED STOCK		COMMON STOCK		ADDITIONAL PAID-IN CAPITAL		RETAINED EARNINGS		ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)		TREASURY STOCK		TOTAL
Balance at January 1, 2021	$	884.9	$	408.6	$	963.6	$	12,207.7	$	428.0	$	(3,204.5)	$	11,688.3
Net Income	—		—		—		1,545.3		—		—		1,545.3
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)	—		—		—		—		(463.6)		—		(463.6)
Dividends Declared:
Common Stock, $2.80 per share	—		—		—		(593.9)		—		—		(593.9)
Preferred Stock	—		—		—		(41.8)		—		—		(41.8)
Stock Awards and Options Exercised	—		—		(24.3)		—		—		174.4		150.1
Stock Purchased	—		—		—		—		—		(267.6)		(267.6)
Balance at December 31, 2021	$	884.9	$	408.6	$	939.3	$	13,117.3	$	(35.6)	$	(3,297.7)	$	12,016.8
Net Income	—		—		—		1,336.0		—		—		1,336.0
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)	—		—		—		—		(1,533.6)		—		(1,533.6)
Dividends Declared:
Common Stock, $2.90 per share	—		—		—		(613.0)		—		—		(613.0)
Preferred Stock	—		—		—		(41.8)		—		—		(41.8)
Stock Awards and Options Exercised	—		—		44.2		—		—		86.3		130.5
Stock Purchased	—		—		—		—		—		(35.4)		(35.4)
Balance at December 31, 2022	$	884.9	$	408.6	$	983.5	$	13,798.5	$	(1,569.2)	$	(3,246.8)	$	11,259.5
Net Income	—		—		—		1,107.3		—		—		1,107.3
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)	—		—		—		—		431.3		—		431.3
Dividends Declared:
Common Stock, $3.00 per share	—		—		—		(630.2)		—		—		(630.2)
Preferred Stock	—		—		—		(41.8)		—		—		(41.8)
Stock Awards and Options Exercised	—		—		26.1		—		—		95.7		121.8
Stock Purchased	—		—		—		—		—		(347.5)		(347.5)
Excise Tax on Share Repurchases	—		—		—		—		—		(2.5)		(2.5)
Balance at December 31, 2023	$	884.9	$	408.6	$	1,009.6	$	14,233.8	$	(1,137.9)	$	(3,501.1)	$	11,897.9

See accompanying notes to consolidated financial statements on pages 102-171.    

100 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

CONSOLIDATED FINANCIAL STATEMENTS

CONSOLIDATED STATEMENTS OF CASH FLOWS

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	$	1,107.3	$	1,336.0	$	1,545.3
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Investment Security (Gains) Losses, net	169.5		1.1		0.3
Amortization and Accretion of Securities and Unearned Income, net	3.0		59.2		99.7
Provision for Credit Losses	24.5		12.0		(81.5)
Depreciation and Amortization	634.6		553.6		515.6
Change in Accrued Income Taxes	(44.4)		61.3		37.2
Pension Plan Contributions	(20.4)		(24.3)		(11.2)
Deferred Income Tax Provision	(48.2)		(142.7)		2.0
Change in Receivables	12.0		57.9		(460.9)
Change in Interest Payable	85.8		172.6		(7.8)
Change in Collateral With Derivative Counterparties, net	(72.6)		639.4		(466.5)
Other Operating Activities, net	774.5		(333.7)		183.8
Net Cash Provided by Operating Activities	2,625.6		2,392.4		1,356.0
CASH FLOWS FROM INVESTING ACTIVITIES
Change in Federal Funds Sold	32.0		(32.0)		—
Change in Securities Purchased under Agreements to Resell	285.4		(419.0)		897.7
Change in Interest-Bearing Deposits with Banks	28.5		(158.9)		2,344.5
Net Change in Federal Reserve and Other Central Bank Deposits	6,205.9		23,483.8		(9,970.4)
Purchases of Held to Maturity Debt Securities	(32,773.9)		(32,830.8)		(54,734.9)
Proceeds from the Maturity and Redemption of Held to Maturity Debt Securities	32,123.0		37,667.8		54,902.6
Purchases of Available for Sale Debt Securities	(7,320.2)		(4,567.7)		(13,896.2)
Proceeds from the Maturity and Sales of Available for Sale Debt Securities	11,614.8		6,513.0		10,079.0
Change in Loans	(4,702.1)		(2,441.6)		(6,744.7)
Purchases of Buildings and Equipment	(116.5)		(128.6)		(95.5)
Purchases and Development of Computer Software	(559.3)		(594.9)		(419.6)
Change in Client Security Settlement Receivables	1,505.5		258.0		(801.4)
Bank-Owned Life Insurance Policy Premiums	—		(500.0)		—
Other Investing Activities, net	(1,539.0)		(319.3)		(163.7)
Net Cash Provided by (Used in) Investing Activities	4,784.1		25,929.8		(18,602.6)
CASH FLOWS FROM FINANCING ACTIVITIES
Change in Deposits	(8,478.4)		(32,996.9)		17,885.5
Change in Federal Funds Purchased	1,148.6		1,896.7		(260.0)
Change in Securities Sold under Agreements to Repurchase	217.5		35.3		492.1
Change in Short-Term Other Borrowings	(1,059.1)		3,966.9		(426.5)
Proceeds from Long-Term Debt	2,000.0		—		—
Proceeds from Senior Notes	—		1,988.8		—
Repayments of Senior Notes	—		(500.0)		(500.0)
Repayment of Floating Rate Capital Debt	—		—		(278.8)
Treasury Stock Purchased	(347.5)		(35.4)		(267.6)
Net Proceeds from Stock Options	2.3		3.9		53.8
Cash Dividends Paid on Common Stock	(621.5)		(750.2)		(583.3)
Cash Dividends Paid on Preferred Stock	(41.8)		(46.5)		(41.8)
Other Financing Activities, net	(2.7)		—		0.1
Net Cash (Used in) Provided by Financing Activities	(7,182.6)		(26,437.4)		16,073.5
Effect of Foreign Currency Exchange Rates on Cash	(89.8)		(287.4)		(159.6)
Change in Cash and Due from Banks	137.3		1,597.4		(1,332.7)
Cash and Due from Banks at Beginning of Period	4,654.2		3,056.8		4,389.5
Cash and Due from Banks at End of Period	$	4,791.5	$	4,654.2	$	3,056.8
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Interest Paid	$	5,285.5	$	822.4	$	30.8
Income Taxes Paid	362.5		459.9		371.0
Transfers from Loans to OREO	0.2		—		12.9
Transfers from Available for Sale Debt Securities to Held to Maturity Debt Securities	—		6,623.3		6,864.1

See accompanying notes to consolidated financial statements on pages 102-171.

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 101

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Note 1 – Summary of Significant Accounting Policies

The consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (GAAP) and reporting practices prescribed for the banking industry. A description of the more significant accounting policies follows.

A. Basis of Presentation. The consolidated financial statements include the accounts of Northern Trust Corporation (Corporation) and its wholly-owned subsidiary, The Northern Trust Company (Bank), and various other wholly-owned subsidiaries of the Corporation and Bank. Throughout the notes to the consolidated financial statements, the term “Northern Trust” refers to the Corporation and its subsidiaries. Intercompany balances and transactions have been eliminated in consolidation. The consolidated statements of income include results of acquired subsidiaries from the dates of acquisition. Certain prior-year balances have been reclassified consistent with the current year’s presentation.

B. Nature of Operations. The Corporation is a bank holding company that has elected to be a financial holding company under the Bank Holding Company Act of 1956, as amended. The Bank is an Illinois banking corporation headquartered in Chicago and the Corporation’s principal subsidiary. The Corporation conducts business in the United States (U.S.) and internationally through various U.S. and non-U.S. subsidiaries, including the Bank.

Northern Trust generates the majority of its revenue from its two client-focused reporting segments: Asset Servicing and Wealth Management. Asset management and related services are provided to Asset Servicing and Wealth Management clients primarily by the Asset Management business.

Asset Servicing is a leading global provider of asset servicing and related services to corporate and public retirement funds, foundations, endowments, fund managers, insurance companies, sovereign wealth funds, and other institutional investors around the globe. Asset servicing and related services encompass a full range of capabilities including but not limited to: custody; fund administration; investment operations outsourcing; investment management; investment risk and analytical services; employee benefit services; securities lending; foreign exchange; treasury management; brokerage services; transition management services; banking; and cash management. Client relationships are managed through the Bank and the Bank’s and the Corporation’s other subsidiaries, including support from locations in North America, Europe, the Middle East, and the Asia-Pacific region.

Wealth Management focuses on high-net-worth individuals and families, business owners, executives, professionals, retirees, and established privately-held businesses in its target markets. In supporting these targeted segments, Wealth Management provides trust, investment management, custody, and philanthropic services; financial consulting; guardianship and estate administration; family business consulting; family financial education; brokerage services; and private and business banking. Wealth Management also includes Global Family Office, which provides customized services, including but not limited to: investment consulting; global custody; fiduciary; and private banking; family office consulting, and technology solutions, to meet the complex financial and reporting needs of ultra-high-net-worth individuals and family offices across the globe. Wealth Management services are delivered by multidisciplinary teams through a network of offices in 19 U.S. states and Washington, D.C., as well as offices in London, Guernsey, and Abu Dhabi.

C. Use of Estimates in the Preparation of Financial Statements. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions in the application of certain of our significant accounting policies that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenue and expense during the reporting period. Actual results could differ from those estimates.

D. Foreign Currency Remeasurement and Translation. Asset and liability accounts denominated in nonfunctional currencies are remeasured into functional currencies at period-end rates of exchange, except for certain balance sheet items including but not limited to buildings and equipment, goodwill and other intangible assets, which are remeasured at historical exchange rates. Results from remeasurement of asset and liability accounts are reported in Other Operating Income on the consolidated statements of income. Income and expense accounts are remeasured at period-average rates of exchange.

Asset and liability accounts of entities with functional currencies that are not the U.S. dollar are translated at period-end rates of exchange. Income and expense accounts are translated at period-average rates of exchange. Translation adjustments, net of applicable taxes, are reported directly to accumulated other comprehensive income (AOCI), a component of stockholders’ equity.

E. Securities. Available for Sale (AFS) Securities are reported at fair value, with unrealized gains and losses credited or charged, net of the tax effect, to AOCI. Realized gains and losses on AFS securities are determined on a specific identification basis and are reported within Investment Security Gains (Losses), net, on the consolidated statements of

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

income. Interest income is recorded on the accrual basis, adjusted for the amortization of premium and accretion of discount.

Held to Maturity (HTM) Securities consist of debt securities that management intends to, and Northern Trust has the ability to, hold until maturity. Such securities are reported at cost, adjusted for amortization of premium and accretion of discount. Interest income is recorded on the accrual basis adjusted for the amortization of premium and accretion of discount.

Held for Trading Securities are reported at fair value. Realized and unrealized gains and losses on securities held for trading are reported within Security Commissions and Trading Income on the consolidated statements of income.

Nonmarketable Securities primarily consist of Federal Reserve Bank of Chicago and Federal Home Loan Bank stock and community development investments, each of which are recorded in Other Assets on the consolidated balance sheets. Federal Reserve Bank of Chicago and Federal Home Loan Bank stock are reported at cost, which represents redemption value. Community development investments are typically reported at amortized cost. Those community development investments that are designed to generate a return primarily through realization of tax credits and other tax benefits, which are discussed in further detail in Note 28, “Variable Interest Entities,” are amortized over the lives of the related tax credits and other tax benefits.

F. Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repurchase. Securities purchased under agreements to resell and securities sold under agreements to repurchase are accounted for as collateralized financings and recorded at the amounts at which the securities were acquired or sold plus accrued interest. To minimize any potential credit risk associated with these transactions, the fair value of the securities purchased or sold is monitored, limits are set on exposure with counterparties, and the financial condition of counterparties is regularly assessed. It is Northern Trust’s policy to take possession, either directly or via third-party custodians, of securities purchased under agreements to resell. Securities sold under agreements to repurchase are either directly held by, or pledged to the counterparty until the repurchase. Northern Trust nets securities sold under agreements to repurchase against those purchased under agreements to resell when the requirements to net are met.

G. Derivative Financial Instruments. Northern Trust is a party to various derivative financial instruments that are used in the normal course of business to meet the needs of its clients, as part of its trading activity for its own account, and as part of its risk management activities. These instruments generally include foreign exchange contracts, interest rate contracts, total return swap contracts and credit default swap contracts. All derivative financial instruments, whether designated as hedges or not, are recorded at fair value within Other Assets and Other Liabilities on the consolidated balance sheets. Derivative asset and liability positions with the same counterparty are reflected on a net basis on the consolidated balance sheets in cases where legally enforceable master netting arrangements or similar agreements exist. These derivative assets and liabilities are further reduced by cash collateral received from, and deposited with, derivative counterparties. The accounting for changes in the fair value of a derivative on the consolidated statements of income depends on whether or not the contract has been designated as a hedge and qualifies for hedge accounting under GAAP. Derivative financial instruments are recorded within the line item, Other Operating Activities, net, on the consolidated statement of cash flows, except for net investment hedges which are recorded within Other Investing Activities, net.

Changes in the fair value of client-related and trading derivative instruments, which are not designated hedges under GAAP, are recognized currently in either Foreign Exchange Trading Income or Security Commissions and Trading Income on the consolidated statements of income. Changes in the fair value of derivative instruments entered into for risk management purposes but not designated as hedges are recognized currently in Other Operating Income on the consolidated statements of income. Certain derivative instruments used by Northern Trust to manage risk are formally designated and qualify for hedge accounting as fair value, cash flow, or net investment hedges.

Derivatives designated as fair value hedges are used to limit Northern Trust’s exposure to changes in the fair value of assets and liabilities due to movements in interest rates. Changes in the fair value of the derivative instrument and changes in the fair value of the hedged asset or liability attributable to the hedged risk are recognized currently in Interest Income or Interest Expense on the consolidated statements of income. For substantially all fair value hedges, Northern Trust applies the “shortcut” method of accounting, available under GAAP. As a result, changes recorded in the fair value of the hedged item are assumed to equal the offsetting gain or loss on the derivative. For fair value hedges that do not qualify for the “shortcut” method of accounting, Northern Trust utilizes regression analysis in assessing whether these hedging relationships are highly effective at inception and quarterly thereafter.

Derivatives designated as cash flow hedges are used to minimize the variability in cash flows of earning assets or forecasted transactions caused by movements in interest or foreign exchange rates. Changes in the fair value of such derivatives are recognized in AOCI, a component of stockholders’ equity, and there is no change to the accounting for the hedged item. Balances in AOCI are reclassified to earnings when the hedged forecasted transaction impacts earnings, and are reflected in the same income statement line item. Northern Trust applies the “shortcut” method of accounting for cash flow hedges of certain available for sale investment securities. For cash flow hedges of certain other available for sale

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

investment securities, foreign currency denominated investment securities, and forecasted foreign currency denominated revenue and expenditure transactions, Northern Trust closely matches all terms of the hedged item and hedging derivative at inception and on an ongoing basis. For cash flow hedges of available for sale investment securities, to the extent all terms are not perfectly matched, effectiveness is assessed using regression analysis. For cash flow hedges of forecasted foreign currency denominated revenue and expenditure transactions and investment securities, to the extent all terms are not perfectly matched, effectiveness is assessed using the dollar-offset method.

Foreign exchange contracts and qualifying non-derivative instruments designated as net investment hedges are used to minimize Northern Trust’s exposure to variability in the foreign currency translation of net investments in non-U.S. branches and subsidiaries. Changes in the fair value of the hedging instrument are recognized in AOCI consistent with the related translation gains and losses of the hedged net investment. For net investment hedges, all critical terms of the hedged item and the hedging instrument are matched at inception and on an ongoing basis. Amounts recorded in AOCI are reclassified to earnings only upon the sale or liquidation of an investment in a non-U.S. branch or subsidiary.

Fair value, cash flow, and net investment hedges are designated and formally documented as such contemporaneous with the transaction. The formal documentation describes the hedge relationship and identifies the hedging instruments and hedged items. Included in the documentation is a discussion of the risk management objectives and strategies for undertaking such hedges, the nature of the risk being hedged, and a description of the method for assessing hedge effectiveness at inception and on an ongoing basis. For hedges that do not qualify for the “shortcut” or the critical terms match methods of accounting, a formal assessment is performed on a calendar quarter basis to verify that derivatives used in hedging transactions continue to be highly effective in offsetting the changes in fair value or cash flows of the hedged item. Hedge accounting is discontinued if a derivative ceases to be highly effective, matures, is terminated or sold, if a hedged forecasted transaction is no longer expected to occur, or if Northern Trust removes the derivative’s hedge designation. Subsequent gains and losses on these derivatives are included in Foreign Exchange Trading Income or Security Commissions and Trading Income on the consolidated statements of income. For discontinued cash flow hedges, the accumulated gain or loss on the derivative remains in AOCI and is reclassified to earnings in the period in which the previously hedged forecasted transaction impacts earnings or is no longer probable of occurring. For discontinued fair value hedges, the previously hedged asset or liability ceases to be adjusted for changes in its fair value. Previous adjustments to the hedged item are amortized over the remaining life of the hedged item.

H. Loans. Loans are recognized assets that represent a contractual right to receive money either on demand or on fixed or determinable dates. Loans are disaggregated for disclosure purposes by portfolio segment (segment) and by class. Northern Trust has defined its segments as commercial and personal. A class of loans is a subset of a segment, the components of which have similar risk characteristics, measurement attributes, or risk monitoring methods. The classes within the commercial segment have been defined as commercial and institutional, commercial real estate, non-U.S. and other. The classes within the personal segment have been defined as residential real estate, private client and other.

Loan Classification. Loans that are held for investment are reported at the principal amount outstanding, net of unearned income. Loans classified as held for sale are reported at the lower of cost or fair value. Undrawn commitments relating to loans that are not held for sale are recorded in Other Liabilities and are carried at the amount of unamortized fees with an allowance for credit loss liability recognized for any estimated expected losses.

Nonaccrual Loans and Recognition of Income. Interest income on loans is recorded on an accrual basis unless, in the opinion of management, there is a question as to the ability of the debtor to meet the terms of the loan agreement, or interest or principal is more than 90 days contractually past due and the loan is not well-secured and in the process of collection. Loans meeting such criteria are classified as nonaccrual and interest income is recorded on a cash basis. Past due status is based on how long since the contractual due date a principal or interest payment has been past due. For disclosure purposes, loans that are 29 days past due or less are reported as current. At the time a loan is determined to be nonaccrual, interest accrued but not collected is reversed against interest income in the current period. Interest collected on nonaccrual loans is applied to principal unless, in the opinion of management, collectability of principal is not in doubt. Management’s assessment of indicators of loan collectability, and its policies relative to the recognition of interest income, including the suspension and subsequent resumption of income recognition, do not meaningfully vary between the different loan classes. Nonaccrual loans are returned to performing status when factors indicating doubtful collectability no longer exist. Factors considered in returning a loan to performing status are consistent across all classes of loans and, in accordance with regulatory guidance, relate primarily to expected payment performance. A loan is eligible to be returned to performing status when: (i) no principal or interest that is due is unpaid and repayment of the remaining contractual principal and interest is expected or (ii) the loan has otherwise become well-secured (possessing realizable value sufficient to discharge the debt, including accrued interest, in full) and is in the process of collection (through action reasonably expected to result in debt repayment or restoration to a current status in the near future). A loan that has not been brought fully current may be restored to performing status provided there has been a sustained period of repayment performance (generally a minimum of six payment periods) by the borrower in accordance with the contractual terms, and Northern Trust is reasonably assured of repayment within a reasonable period of time. Additionally, a loan that has been formally

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

restructured so as to be reasonably assured of repayment and performance according to its modified terms may be returned to accrual status, provided there was a well-documented credit evaluation of the borrower’s financial condition and prospects of repayment under the revised terms, and there has been a sustained period of repayment performance (generally a minimum of six payment periods) under the revised terms.

Loan Modifications to Borrowers Experiencing Financial Difficulty - After the Adoption of Accounting Standards Update No. 2022-02. For borrowers experiencing financial difficulties, Northern Trust may provide payment relief by modifying the terms of the original loan. Loan modifications to borrowers experiencing financial difficulty involve primarily the extensions of term, deferrals of principal and interest, interest rate concessions, and other modifications or a combination thereof. Northern Trust considers payment deferrals of less than 90 days as insignificant, absent any material modifications to other loan terms.

The expected credit loss for modifications to borrowers experiencing financial difficulty is measured based on either the expected future cash flows, the value of collateral, or other factors that may impact the borrower’s ability to pay. When the discounted cash flow method is applied, the expected credit loss reflects the difference between the amortized cost basis and the present value of the expected cash flows and is measured based upon the present value of expected future cash flows, discounted at the post-modification effective interest rate and contractual terms. If a loan’s contractual interest rate varies based on subsequent changes in an independent factor, such as an index or rate, the loan’s effective interest rate is calculated based on the factor as it changes over the life of the loan. Northern Trust elected not to project changes in the factor for purposes of estimating expected future cash flows. If the loan is collateral dependent, the expected loss is measured based on the fair value of the collateral at the reporting date.

If the loan valuation is less than the recorded value of the loan, either an allowance is established or a charge-off is recorded for the difference. The nature and extent of further deterioration in credit quality, including a subsequent default, is considered in the determination of an appropriate level of allowance for credit losses for all loan modifications to borrowers experiencing financial difficulty.

Troubled Debt Restructurings (TDRs) - Prior to the Adoption of Accounting Standards Update No. 2022-02. A loan that was modified as a concession by Northern Trust or a bankruptcy court resulting from the debtor’s financial difficulties was referred to as a troubled debt restructuring (TDR). All TDRs were reported starting in the calendar year of their restructuring. In subsequent years, a TDR may have ceased to be reported if the loan was modified at a market rate and performed according to the modified terms for at least six payment periods. A loan that was modified at a below market rate was returned to accrual status if it satisfied the six-payment-period performance requirement.

The expected credit loss was measured based upon the present value of expected future cash flows, discounted at the effective interest rate based on the original contractual rate. If a loan’s contractual interest rate varied based on subsequent changes in an independent factor, such as an index or rate, the loan’s effective interest rate was calculated based on the factor as it changed over the life of the loan. Northern Trust elected not to project changes in the factor for purposes of estimating expected future cash flows. Further, Northern Trust elected not to adjust the effective interest rate for prepayments. If the loan was collateral dependent, the expected loss was measured based on the fair value of the collateral at the reporting date.

If the loan valuation was less than the recorded value of the loan, either an allowance was established, or a charge-off was recorded, for the difference. Smaller balance (individually less than $1 million) homogeneous loans were collectively evaluated.

All loans with TDR modifications were evaluated for additional expected credit losses. The nature and extent of further deterioration in credit quality, including a subsequent default, was considered in the determination of an appropriate level of allowance for credit losses.

Collateral Dependent Financial Assets. A financial asset is collateral-dependent when the borrower is experiencing financial difficulty and repayment is expected to be provided substantially through the sale or operation of the collateral. Most of Northern Trust’s collateral dependent credit exposure relates to its residential real estate portfolio for which the collateral is usually the underlying real estate property. For collateral dependent financial assets, it is Northern Trust’s policy to reserve or charge-off the difference between the amortized cost basis of the loan and the value of the collateral.

Premium, Discounts, Origination Costs and Fees. Premiums and discounts on loans are recognized as an adjustment of yield using the interest method based on the contractual terms of the loan. Certain direct origination costs and fees are netted, deferred and amortized over the life of the related loan as an adjustment to the loan’s yield.

I. Allowance for Credit Losses. The allowance for credit losses represents management’s best estimate of lifetime expected credit losses related to various financial assets subject to credit risk and off-balance sheet credit exposure.

Northern Trust measures expected credit losses of financial assets with similar risk characteristics on a collective basis. A financial asset is measured individually if it does not share similar risk characteristics with other financial assets and the related allowance is determined through an individual evaluation.

Management’s estimates utilized in establishing an appropriate level of allowance for credit losses are not dependent on any single assumption. In determining an appropriate allowance level, management evaluates numerous variables, many

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

of which are interrelated or dependent on other assumptions and estimates, and takes into consideration past events, current conditions and reasonable and supportable forecasts.

Forecasting and Reversion. Estimating expected lifetime credit losses requires the consideration of the effect of future economic conditions. Northern Trust employs multiple scenarios over a reasonable and supportable period (currently two years) to project future conditions. Key variables determined to be relevant for projecting credit losses on the portfolios in scope include macroeconomic factors, such as corporate profits, unemployment, and real estate price indices, as well as financial market factors such as equity prices, volatility, and credit spreads. For periods beyond the reasonable and supportable period, Northern Trust reverts to its own historical loss experiences on a straight-line basis over four quarters.

Allowance for Loans. The allowance estimation methodology for the collective assessment is based on data representative of the Corporation’s financial asset portfolio from a historical observation period that includes both expansionary and recessionary periods. The estimation methodology and the related qualitative adjustment framework segregate the loan portfolio into homogeneous segments based on similar risk characteristics or risk monitoring methods.

Northern Trust utilizes a quantitative probability of default/loss given default approach for the calculation of its credit allowance on a collective basis. For each of the different parameters, specific credit models or qualitative estimation methodologies for the individual loan segments were developed. For each segment, the probability of default and the loss given default are applied to the exposure at default for each projected quarter to determine the quantitative component of the allowance. The quantitative allowance is then reviewed within a qualitative adjustment framework, through which management applies judgment by assessing internal risk factors, potential limitations in the quantitative methodology, and environmental factors that are not fully contemplated in the forecast to compute an adjustment to the quantitative allowance for each segment and class of the loan portfolio.

The allowance related to credit exposures evaluated on an individual basis is determined through evaluations of individual loans, and lending-related commitments that have defaulted, generally those with Borrower Ratings of 8 and 9, that are based on expected future cash flows, the value of collateral, and other factors that may impact the borrowers’ ability to pay. For defaulted loans for which the amount of allowance, if any, is determined based on the value of the underlying collateral, third-party appraisals are typically obtained and utilized by management. These appraisals are generally less than twelve months old and are subject to adjustments to reflect management’s judgment as to the realizable value of the collateral.

Northern Trust analyzes its exposure to credit losses from both on-balance sheet and off-balance sheet activity using a consistent methodology for the quantitative framework as well as the qualitative framework. For purposes of estimating the allowance for credit losses for undrawn loan commitments and standby letters of credit, the exposure at default includes estimated drawdowns of the undrawn commitments based on credit utilization factors, resulting in a proportionate amount of expected credit losses.

Allowance for HTM Securities. HTM debt securities classified as U.S. government, government sponsored agency, and certain securities classified as obligations of states and political subdivisions are considered to be guarantees of the U.S. government or an agency of the U.S. government, and therefore an allowance for credit losses is not estimated for such investments as the expected probability of non-payment of the amortized cost basis is zero.

HTM debt securities classified as “other asset-backed securities” represent pools of underlying receivables from which the cash flows are used to pay the bonds that vary in seniority. Utilizing a qualitative estimation approach, the allowance for other asset-backed securities is assessed by evaluating underlying pool performance based on delinquency rates and available credit support.

HTM debt securities classified as “other” relate to investments purchased by Northern Trust to fulfill its obligations under the Community Reinvestment Act (CRA). Northern Trust fulfills its obligations under the CRA by making qualified investments for purposes of supporting institutions and programs that benefit low-to-moderate income communities within Northern Trust’s market area. The allowance for CRA investments is assessed using a qualitative estimation approach primarily based on internal historical performance experience and default history of the underlying CRA portfolios to determine a quantitative component of the allowance.

The allowance estimation methodology for all other HTM debt securities is developed using a combination of external and internal data. The estimation methodology groups securities with shared characteristics for which the probability of default and the loss given default are applied to the total exposure at default to determine a quantitative component of the allowance.

Allowance for AFS Securities. AFS securities impairment reviews are conducted quarterly to identify and evaluate securities that have indications of possible credit losses. A determination as to whether a security’s decline in market value is related to credit impairment takes into consideration numerous factors and the relative significance of any single factor can vary by security. Factors Northern Trust considers in determining whether impairment is credit related include, but are not limited to, the severity of the impairment; the cause of the impairment; the financial condition and near-term prospects of the issuer; activity in the market of the issuer, which may indicate adverse credit conditions; Northern Trust’s intent regarding the sale of the security as of the balance sheet date; and the likelihood that Northern Trust will not be required to

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sell the security for a period of time sufficient to allow for the recovery of the security’s amortized cost basis. For each security meeting the requirements of Northern Trust’s internal screening process, an extensive review is conducted to determine if a credit loss has occurred that is then based on the best estimate of cash flows to be collected from the security, discounted using the security’s effective interest rate. If the present value of the expected cash flows is found to be less than the current amortized cost of the security, an allowance for credit losses is generally recorded equal to the difference between the two amounts, limited to the amount the amortized cost basis exceeds the fair value of the security.

If management intends to sell, or will more likely than not be required to sell, an AFS security prior to recovery of its amortized cost basis, the security is written down to fair value with unrealized losses recognized in Investment Security Gains (Losses), net on the consolidated statements of income.

Allowance for Other Financial Assets. The allowance for other financial assets covers assets categorized as Due from Banks, Other Central Bank Deposits, Interest-Bearing Deposits with Banks, Federal Funds Sold, and Other Assets. The Other Assets category includes other miscellaneous credit exposures reported in Other Assets on the consolidated balance sheets. The allowance estimation methodology for other financial assets primarily utilizes a similar approach as the one used for the HTM debt securities portfolio. It consists of a combination of externally and internally developed loss data, adjusted for the appropriate contractual term. Northern Trust’s portfolio is composed mostly of institutions within the “1 to 3” internal borrower rating category and is expected to exhibit minimal to modest likelihood of loss.

The portion of the allowance assigned to loans, HTM debt securities, and other financial assets is presented as a contra asset in Allowance for Credit Losses on the consolidated balance sheets. The portion of the allowance assigned to undrawn loan commitments and standby letters of credit is reported in Other Liabilities on the consolidated balance sheets. The allowance for AFS securities is presented parenthetically with the amortized cost basis of AFS securities on the consolidated balance sheets.

Provision for Credit Losses. Provision for Credit Losses on the consolidated statements of income represents the change in the Allowance for Credit Losses on the consolidated balance sheets and is the charge to current period earnings. It represents the amount needed to maintain the Allowance for Credit Losses on the consolidated balance sheets at an appropriate level to absorb lifetime expected credit losses related to financial assets in scope. Actual losses may vary from current estimates and the amount of the Provision for Credit Losses may be either greater than or less than actual net charge-offs.

Contractual Term. Northern Trust estimates expected credit losses over the contractual term of the financial assets adjusted for prepayments, unless prepayments are not relevant to specific portfolios or sub-portfolios. Extension and renewal options are typically not considered since it is not Northern Trust’s practice to enter into arrangements where the borrower has the unconditional option to renew, or a conditional extension option whereby the conditions are beyond Northern Trust’s control.

Accrued Interest. Northern Trust elected not to measure an allowance for credit losses for accrued interest receivables related to its loan and securities portfolios as its policy is to write-off uncollectible accrued interest receivable balances in a timely manner. Accrued interest is written off by reversing interest income during the quarter the financial asset is moved from an accrual to a nonaccrual status.

J. Standby Letters of Credit. Fees on standby letters of credit are recognized in Other Operating Income on the consolidated statements of income using the straight-line method over the lives of the underlying agreements. Northern Trust’s recorded other liability for standby letters of credit, reflecting the obligation it has undertaken, is measured as the amount of unamortized fees on these instruments.

K. Buildings and Equipment. Buildings and equipment owned are carried at original cost less accumulated depreciation. The charge for depreciation is computed using the straight-line method based on the following range of lives: buildings – up to 30 years; equipment – 3 to 10 years; and leasehold improvements – the shorter of the lease term or 15 years.

L. Other Real Estate Owned (OREO). OREO is comprised of commercial and residential real estate properties acquired in partial or total satisfaction of loans. OREO assets are carried at the lower of cost or fair value less estimated costs to sell and are recorded in Other Assets on the consolidated balance sheets. Fair value is typically based on third-party appraisals. Appraisals of OREO properties are updated on an annual basis and are subject to adjustments to reflect management’s judgment as to the realizable value of the properties. Losses identified during the 90-day period after the acquisition of such properties are charged against the Allowance for Credit Losses assigned to Loans. Subsequent write-downs to the carrying value of these assets that may be required and gains or losses realized from asset sales are recorded within Other Operating Expense on the consolidated statements of income.

M. Goodwill and Other Intangible Assets. Goodwill is not subject to amortization. Separately identifiable acquired intangible assets with finite lives are amortized over their estimated useful lives, primarily on a straight-line basis. Purchased software, software licenses, and allowable internal costs, including compensation relating to software developed for internal use, are capitalized. Software is amortized using the straight-line method over the estimated useful lives of the

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assets, generally ranging from 3 to 10 years. Fees paid for the use of software services that do not convey a software license are expensed as incurred.

Goodwill and other intangible assets are reviewed for impairment on an annual basis or more frequently if events or changes in circumstances indicate the carrying amounts may not be recoverable.

N. Trust, Investment and Other Servicing Fees. Trust, Investment and Other Servicing Fees are recorded on an accrual basis, over the period in which the service is provided. Fees are primarily a function of the market value of assets custodied, managed and serviced, transaction volumes, and securities lending volume and spreads, as set forth in the underlying client agreement. This revenue recognition involves the use of estimates and assumptions, including components that are calculated based on estimated asset valuations and transaction volumes.

O. Client Security Settlement Receivables. These receivables result from custody client security sales executed under contractual settlement date accounting that have not yet settled as well as custody client withdrawals from short-term investment funds that settle on the following business day. Northern Trust advances cash to the client on the date of either trade execution or client withdrawal and awaits collection from either the settled trade or short-term investment funds.

P. Income Taxes. Northern Trust follows an asset and liability approach to account for income taxes. The objective is to recognize the amount of taxes payable or refundable for the current year, and to recognize deferred tax assets and liabilities for future tax consequences of temporary differences between the amounts reported in the financial statements and the tax bases of assets and liabilities. The measurement of tax assets and liabilities is based on enacted tax laws and applicable tax rates.

Tax positions taken or expected to be taken on a tax return are evaluated based on their likelihood of being sustained upon examination by tax authorities. Only tax positions that are considered more-likely-than-not to be sustained are recorded on the consolidated financial statements. A valuation allowance is established for deferred tax assets if it is more-likely-than-not that all or a portion will not be realized. Northern Trust recognizes any interest and penalties related to unrecognized tax benefits in the Provision for Income Taxes on the consolidated statements of income.

Q. Cash Flow Statements. Cash and cash equivalents in the cash flow statements have been defined as “Cash and Due from Banks” on the consolidated balance sheets.

R. Pension and Other Postretirement Benefits. Northern Trust records the funded status of its defined benefit pension and other postretirement plans on the consolidated balance sheets. Overfunded pension and postretirement benefits are reported in Other Assets and underfunded pension and postretirement benefits are reported in Other Liabilities on the consolidated balance sheets. Plan assets and benefit obligations are measured annually at December 31, unless specific circumstances require an interim remeasurement. Plan assets are determined based on fair value generally representing observable market prices. The projected benefit obligations are determined based on the present value of projected benefit distributions at an assumed discount rate. Actuarial gains and losses accumulated in AOCI are amortized as a component of net periodic pension cost if they exceed 10% of the greater of the projected benefit obligation or the market-related value of plan assets as of the beginning of the year. Amortization is recognized on a straight-line basis over the expected average remaining service period of the active employees or over the expected remaining lifetime of plan participants for plans that have been previously frozen.

S. Share-Based Compensation Plans. Northern Trust recognizes as expense the grant-date fair value of stock and stock unit awards and other share-based compensation granted to employees as Compensation on the consolidated statements of income. The fair values of stock and stock unit awards, including performance stock unit awards and director awards, are based on the closing price of the Corporation’s stock on the date of grant adjusted for certain awards that do not accrue dividends while vesting.

Compensation expense for share-based award grants with terms that provide for a graded vesting schedule, whereby portions of the award vest in increments over the requisite service period, are recognized on a straight-line basis over the requisite service period for the entire award. Compensation expense for performance stock unit awards are recognized on a straight-line basis over the requisite service period of the award based on expected achievement of the performance condition. Adjustments are made for employees that meet certain eligibility criteria at the grant date or during the requisite service period.

Northern Trust does not include an estimate of future forfeitures in its recognition of share-based compensation expense. Share-based compensation expense is adjusted based on forfeitures as they occur. Dividend equivalents are accrued for performance stock unit awards, most restricted stock unit awards, and director awards not yet vested, and are paid upon vesting. Certain restricted stock units are not entitled to dividend equivalents during the vesting period. Cash flows resulting from the realization of excess tax benefits are classified as operating cash flows on the consolidated statements of cash flows.

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T. Net Income Per Common Share. Basic net income per common share is computed by dividing net income/loss applicable to common stock by the weighted average number of common shares outstanding during each period. Diluted net income per common share is computed by dividing net income applicable to common stock and potential common shares by the aggregate of the weighted average number of common shares outstanding during the period and common share equivalents calculated for stock options outstanding using the treasury stock method. In a period of a net loss, diluted net income per common share is calculated in the same manner as basic net income per common share.

Northern Trust calculates net income applicable to common stock using the two-class method, whereby net income is allocated between common stock and participating securities.

Note 2 – Recent Accounting Pronouncements

On January 1, 2023, Northern Trust adopted Accounting Standards Update (ASU) No. 2022-01, “Derivatives and Hedging (Topic 815): Fair Value Hedging—Portfolio Layer Method” (ASU 2022-01). The amendments in ASU 2022-01 expand the current last-of-layer hedging model from a single-layer method to allow multiple hedged layers of a single closed portfolio. To reflect that expansion, the last-of-layer method is renamed the portfolio layer method. In addition, ASU 2022-01 (1) expands the scope of the portfolio layer method to include non-prepayable assets, (2) specifies eligible hedging instruments in a single-layer hedge, (3) provides additional guidance on the accounting for and disclosure of hedge basis adjustments under the portfolio layer method and (4) specifies how hedge basis adjustments should be considered when determining credit losses for the assets included in the closed portfolio. Upon adoption of ASU 2022-01, there was no impact to Northern Trust’s consolidated balance sheets or consolidated statements of income.

On January 1, 2023, Northern Trust adopted ASU No. 2022-02, “Financial Instruments—Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures” (ASU 2022-02). The amendments in ASU 2022-02 eliminate the accounting guidance for troubled debt restructurings (TDRs) for creditors that have adopted the current expected credit losses accounting standard while enhancing disclosure requirements for certain loan refinancings and restructurings made to borrowers experiencing financial difficulty. In addition, ASU 2022-02 requires that a public business entity disclose current-period gross charge-offs by year of origination for financing receivables and net investment in leases. Upon adoption of ASU 2022-02, there was no significant impact to Northern Trust’s consolidated balance sheets or consolidated statements of income. Please refer to Note 5, “Loans” for further information.

On January 1, 2023, Northern Trust adopted ASU No. 2022-04, “Liabilities—Supplier Finance Programs (Topic 405-50): Disclosure of Supplier Finance Program Obligations” (ASU 2022-04). The amendments in ASU 2022-04 enhance the transparency about the use of supplier finance programs for investors or other allocators of capital. Specifically, ASU 2022-04 requires that a buyer in a supplier finance program disclose sufficient qualitative and quantitative information about the program to allow a user of financial statements to understand the program’s nature, activity during the period, changes from period to period, and potential magnitude. Upon adoption of ASU 2022-04, there was no impact to Northern Trust’s consolidated balance sheets or consolidated statements of income.

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Note 3 – Fair Value Measurements

Fair value under GAAP is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants on the measurement date.

Fair Value Hierarchy. The following describes the hierarchy of valuation inputs (Levels 1, 2, and 3) used to measure fair value and the primary valuation methodologies used by Northern Trust for financial instruments measured at fair value on a recurring basis. Observable inputs reflect market data obtained from sources independent of the reporting entity; unobservable inputs reflect the entity’s own assumptions about how market participants would value an asset or liability based on the best information available. GAAP requires an entity measuring fair value to maximize the use of observable inputs and minimize the use of unobservable inputs and establishes a fair value hierarchy of inputs. Financial instruments are categorized within the hierarchy based on the lowest level input that is significant to their valuation. Northern Trust’s policy is to recognize transfers into and transfers out of fair value levels as of the end of the reporting period in which the transfer occurred. No transfers into or out of Level 3 occurred during the years ended December 31, 2023, or 2022.

Level 1 – Quoted, active market prices for identical assets or liabilities. Northern Trust’s Level 1 assets are comprised primarily of AFS investments in U.S. Treasury securities.

Level 2 – Observable inputs other than Level 1 prices, such as quoted active market prices for similar assets or liabilities, quoted prices for identical or similar assets in inactive markets, and model-derived valuations in which all significant inputs are observable in active markets. Northern Trust’s Level 2 assets include AFS and certain trading account debt securities, the fair values of which are determined predominantly by external pricing vendors. Prices received from vendors are compared to other vendor and third-party prices. If a security price obtained from a pricing vendor is determined to exceed pre-determined tolerance levels that are assigned based on an asset type’s characteristics, the exception is researched and, if the price is not able to be validated, an alternate pricing vendor is utilized, consistent with Northern Trust’s pricing source hierarchy. As of December 31, 2023, Northern Trust’s AFS debt securities portfolio included 929 Level 2 securities with an aggregate market value of $19.5 billion. All 929 debt securities were valued by external pricing vendors. As of December 31, 2022, Northern Trust’s AFS debt securities portfolio included 1,163 Level 2 debt securities with an aggregate market value of $24.0 billion. All 1,163 debt securities were valued by external pricing vendors.

Northern Trust has established processes and procedures to assess the suitability of valuation methodologies used by external pricing vendors, including reviews of valuation techniques and assumptions used for selected securities. On a daily basis, periodic quality control reviews of prices received from vendors are conducted which include comparisons to prices on similar security types received from multiple pricing vendors and to the previous day’s reported prices for each security. Predetermined tolerance level exceptions are researched and may result in additional validation through available market information or the use of an alternate pricing vendor. Quarterly, Northern Trust reviews documentation from third-party pricing vendors regarding the valuation processes and assumptions used in their valuations and assesses whether the fair value levels assigned by Northern Trust to each security classification are appropriate. Annually, valuation inputs used within third-party pricing vendor valuations are reviewed for propriety on a sample basis through a comparison of inputs used to comparable market data, including security classifications that are less actively traded and security classifications comprising significant portions of the portfolio.

Level 2 assets and liabilities also include derivative contracts which are valued internally using widely accepted income-based models that incorporate inputs readily observable in actively quoted markets and reflect the contractual terms of the contracts. Observable inputs include foreign exchange rates and interest rates for foreign exchange contracts; interest rates for interest rate swap contracts and forward contracts; and interest rates and volatility inputs for interest rate option contracts. Northern Trust evaluates the impact of counterparty credit risk and its own credit risk on the valuation of its derivative instruments. Factors considered include the likelihood of default by Northern Trust and its counterparties, the remaining maturities of the instruments, net exposures after giving effect to master netting arrangements or similar agreements, available collateral, and other credit enhancements in determining the appropriate fair value of derivative instruments. The resulting valuation adjustments have not been considered material.

Level 3 – Valuation techniques in which one or more significant inputs are unobservable in the marketplace.

Northern Trust’s Level 3 liabilities consist of swaps that Northern Trust entered into with the purchaser of 1.1 million and 1.0 million shares of Visa Inc. Class B common stock (Visa Class B common shares) previously held by Northern Trust and sold in June 2016 and 2015, respectively. Pursuant to the swaps, Northern Trust retains the risks associated with the ultimate conversion of the Visa Class B common shares into shares of Visa Inc. Class A common stock (Visa Class A common shares), such that the counterparty will be compensated for any dilutive adjustments to the conversion ratio and Northern Trust will be compensated for any anti-dilutive adjustments to the ratio. The swaps also require periodic payments from Northern Trust to the counterparty calculated by reference to the market price of Visa Class A common shares and a fixed rate of interest. The fair value of the swaps is determined using a discounted cash flow methodology. The significant unobservable inputs used in the fair value measurement are Northern Trust’s own assumptions about

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estimated changes in the conversion rate of the Visa Class B common shares into Visa Class A common shares, the date on which such conversion is expected to occur and the estimated growth rate of the Visa Class A common share price. See “Visa Class B Common Shares” under Note 24, “Commitments and Contingent Liabilities,” for further information.

Northern Trust believes its valuation methods for its assets and liabilities carried at fair value are appropriate; however, the use of different methodologies or assumptions, particularly as applied to Level 3 assets and liabilities, could have a material effect on the computation of their estimated fair values.

Management of various businesses and departments of Northern Trust (including Corporate Market Risk, Credit Risk Management, Corporate Finance, Asset Servicing and Wealth Management) reviews valuation methods and models for Level 3 assets and liabilities. Fair value measurements are performed upon acquisitions of an asset or liability. Management of the appropriate business or department reviews assumed inputs, especially when unobservable in the marketplace, in order to substantiate their use in each fair value measurement. When appropriate, management reviews forecasts used in the valuation process in light of other relevant financial projections to understand any variances between current and previous fair value measurements. In certain circumstances, third party information is used to support the fair value measurements. If certain third party information seems inconsistent with consensus views, a review of the information is performed by management of the respective business or department to determine the appropriate fair value of the asset or liability.

The following table presents the fair values of Northern Trust’s Level 3 liabilities as of December 31, 2023 and 2022, as well as the valuation techniques, significant unobservable inputs, and quantitative information used to develop significant unobservable inputs for such liabilities as of such dates.

TABLE 51: LEVEL 3 SIGNIFICANT UNOBSERVABLE INPUTS

	DECEMBER 31, 2023
FINANCIAL INSTRUMENT	FAIR VALUE	VALUATION TECHNIQUE	UNOBSERVABLE INPUTS	INPUT VALUES			WEIGHTED-AVERAGE INPUT VALUES(1)
Swaps Related to Sale of Certain Visa Class B Common Shares	$25.4 million	Discounted Cash Flow	Conversion Rate	1.59x			1.59x
			Visa Class A Appreciation	10.49%			10.49%
			Expected Duration	9	-	27 months	13 months

(1) Weighted average of expected duration based on scenario probability.

	DECEMBER 31, 2022
FINANCIAL INSTRUMENT	FAIR VALUE	VALUATION TECHNIQUE	UNOBSERVABLE INPUTS	INPUT VALUES			WEIGHTED-AVERAGE INPUT VALUES(1)
Swaps Related to Sale of Certain Visa Class B Common Shares	$34.8 million	Discounted Cash Flow	Conversion Rate	1.60x			1.60x
			Visa Class A Appreciation	8.53%			8.53%
			Expected Duration	12	-	33 months	20 months

(1) Weighted average of expected duration based on scenario probability.

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The following presents assets and liabilities measured at fair value on a recurring basis as of December 31, 2023 and 2022, segregated by fair value hierarchy level.

TABLE 52: RECURRING BASIS HIERARCHY LEVELING

	DECEMBER 31, 2023
(In Millions)	LEVEL 1		LEVEL 2		LEVEL 3		NETTING		ASSETS/ LIABILITIES AT FAIR VALUE
Debt Securities
Available for Sale
U.S. Government	$	3,622.2	$	—	$	—	$	—	$	3,622.2
Obligations of States and Political Subdivisions	—		295.8		—		—		295.8
Government Sponsored Agency	—		11,553.0		—		—		11,553.0
Non-U.S. Government	—		264.4		—		—		264.4
Corporate Debt	—		279.5		—		—		279.5
Covered Bonds	—		347.1		—		—		347.1
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	—		2,899.9		—		—		2,899.9
Other Asset-Backed	—		2,962.6		—		—		2,962.6
Commercial Mortgage-Backed	—		865.3		—		—		865.3
Total Available for Sale	3,622.2		19,467.6		—		—		23,089.8
Other Assets
Money Market Investment	95.0		—		—		—		95.0
Derivative Assets
Foreign Exchange Contracts	—		3,266.7		—		(2,937.2)		329.5
Interest Rate Contracts	—		301.5		—		(189.5)		112.0
Total Derivative Assets	—		3,568.2		—		(3,126.7)		441.5
Other Liabilities
Derivative Liabilities
Foreign Exchange Contracts	—		3,255.2		—		(2,175.7)		1,079.5
Interest Rate Contracts	—		369.2		—		(6.0)		363.2
Other Financial Derivatives(1)	—		—		25.4		(23.7)		1.7
Total Derivative Liabilities	$	—	$	3,624.4	$	25.4	$	(2,205.4)	$	1,444.4

Note: Northern Trust has elected to net derivative assets and liabilities when legally enforceable master netting arrangements or similar agreements exist between Northern Trust and the counterparty. As of December 31, 2023, derivative assets and liabilities shown above also include reductions of $2,093.8 million and $1,172.5 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties.

(1) This line consists of swaps related to the sale of certain Visa Class B common shares.

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	DECEMBER 31, 2022
(In Millions)	LEVEL 1		LEVEL 2		LEVEL 3		NETTING		ASSETS/ LIABILITIES AT FAIR VALUE
Debt Securities
Available for Sale
U.S. Government	$	2,747.4	$	—	$	—	$	—	$	2,747.4
Obligations of States and Political Subdivisions	—		787.6		—		—		787.6
Government Sponsored Agency	—		11,545.2		—		—		11,545.2
Non-U.S. Government	—		360.0		—		—		360.0
Corporate Debt	—		1,747.6		—		—		1,747.6
Covered Bonds	—		388.7		—		—		388.7
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	—		2,479.4		—		—		2,479.4
Other Asset-Backed	—		5,256.2		—		—		5,256.2
Commercial Mortgage Backed	—		1,387.8		—		—		1,387.8
Total Available for Sale	2,747.4		23,952.5		—		—		26,699.9
Trading Account	95.0		0.2		—		—		95.2
Total Available for Sale and Trading Debt Securities	2,842.4		23,952.7		—		—		26,795.1
Other Assets
Derivative Assets
Foreign Exchange Contracts	—		3,510.1		—		(2,666.4)		843.7
Interest Rate Contracts	—		222.0		—		(144.3)		77.7
Other Financial Derivatives(1)	—		0.3		—		—		0.3
Total Derivatives Assets	—		3,732.4		—		(2,810.7)		921.7
Other Liabilities
Derivative Liabilities
Foreign Exchange Contracts	—		3,187.5		—		(1,826.7)		1,360.8
Interest Rate Contracts	—		431.8		—		(5.9)		425.9
Other Financial Derivatives(2)	—		—		34.8		(33.3)		1.5
Total Derivative Liabilities	$	—	$	3,619.3	$	34.8	$	(1,865.9)	$	1,788.2

Note: Northern Trust has elected to net derivative assets and liabilities when legally enforceable master netting arrangements or similar agreements exist between Northern Trust and the counterparty. As of December 31, 2022, derivative assets and liabilities shown above also include reductions of $1,140.2 million and $195.3 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties.

(1) This line consists of total return swap contracts.

(2) This line consists of swaps related to the sale of certain Visa Class B common shares.

The following table presents the changes in Level 3 liabilities for the years ended December 31, 2023 and 2022.

TABLE 53: CHANGES IN LEVEL 3 LIABILITIES

LEVEL 3 LIABILITIES	SWAPS RELATED TO SALE OF CERTAIN VISA CLASS B COMMON SHARES
(In Millions)	2023		2022
Fair Value at January 1	$	34.8	$	37.5
Total (Gains) Losses:
Included in Earnings(1)	18.9		22.6
Purchases, Issues, Sales, and Settlements
Settlements	(28.3)		(25.3)
Fair Value at December 31	$	25.4	$	34.8
Unrealized Losses (Gains) Included in Earnings Related to Financial Instruments Held at December 31(1)	$	15.4	$	16.6

(1) Gains (losses) are recorded in Other Operating Income on the consolidated statements of income.

Carrying values of assets and liabilities that are not measured at fair value on a recurring basis may be adjusted to fair value in periods subsequent to their initial recognition, for example, to record an impairment of an asset. GAAP requires entities to separately disclose these subsequent fair value measurements and to classify them under the fair value hierarchy.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Assets measured at fair value on a nonrecurring basis at December 31, 2023 and 2022, all of which were categorized as Level 3 under the fair value hierarchy, were comprised of nonaccrual loans whose values were based on real estate and other available collateral, and of OREO properties.

Fair values of real estate loan collateral were estimated using a market approach typically supported by third-party valuations and property-specific fees and taxes. As of December 31, 2023, the fair values of real estate loan collateral were subject to adjustments to reflect management’s judgment as to realizable value and consisted of discount factors ranging from 0.0% to 20.0% with a weighted average based on fair values of 2.0%. As of December 31, 2022, the fair value of real estate loan collateral consisted of discount factors ranging from 15.0% to 20.0% with a weighted average based on fair values of 17.2%. Other loan collateral, which typically consists of accounts receivable, inventory and equipment, is valued using a market approach adjusted for asset-specific characteristics and in limited instances third-party valuations are used. OREO assets are carried at the lower of cost or fair value less estimated costs to sell, with fair value typically based on third-party appraisals.

Collateral-dependent nonaccrual loans that have been adjusted to fair value totaled $43.3 million and $6.6 million at December 31, 2023 and 2022, respectively.

The following table presents the fair values of Northern Trust’s Level 3 assets that were measured at fair value on a nonrecurring basis as of December 31, 2023 and 2022, as well as the valuation technique, significant unobservable inputs, and quantitative information used to develop the significant unobservable inputs for such assets as of such dates.

TABLE 54: LEVEL 3 NONRECURRING BASIS SIGNIFICANT UNOBSERVABLE INPUTS

	DECEMBER 31, 2023
FINANCIAL INSTRUMENT	FAIR VALUE(1)	VALUATION  TECHNIQUE	UNOBSERVABLE INPUTS	INPUT VALUES			WEIGHTED-AVERAGE INPUT VALUES
Loans	$43.3 million	Market Approach	Discount factor applied to real estate collateral-dependent loans to reflect realizable value	0.0%	–	20.0%	2.0%

(1) Includes real estate collateral-dependent loans and other collateral-dependent loans.

	DECEMBER 31, 2022
FINANCIAL INSTRUMENT	FAIR VALUE(1)	VALUATION  TECHNIQUE	UNOBSERVABLE INPUTS	INPUT VALUES			WEIGHTED-AVERAGE INPUT VALUES
Loans	$6.6 million	Market Approach	Discount factor applied to real estate collateral-dependent loans to reflect realizable value	15.0%	–	20.0%	17.2%

(1) Includes real estate collateral-dependent loans and other collateral-dependent loans.

114 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

The following tables presents the book value and estimated fair value, including the fair value hierarchy level, of Northern Trust’s financial instruments that are not measured at fair value on the consolidated balance sheets as of December 31, 2023 and 2022. The following tables exclude those items measured at fair value on a recurring basis.

TABLE 55: FAIR VALUE OF FINANCIAL INSTRUMENTS

	DECEMBER 31, 2023
					ESTIMATED FAIR VALUE
(In Millions)	BOOK VALUE		TOTAL ESTIMATED FAIR VALUE		LEVEL 1		LEVEL 2		LEVEL 3
FINANCIAL ASSETS
Cash and Due from Banks	$	4,791.5	$	4,791.5	$	4,791.5	$	—	$	—
Federal Reserve and Other Central Bank Deposits	34,326.2		34,326.2		—		34,326.2		—
Interest-Bearing Deposits with Banks	1,939.0		1,939.0		—		1,939.0		—
Securities Purchased under Agreements to Resell	784.7		784.7		—		784.7		—
Debt Securities - Held to Maturity	26,221.7		24,473.0		—		24,473.0		—
Loans
Held for Investment	47,438.3		47,598.3		—		—		47,598.3
Other Assets	1,476.6		1,458.0		86.1		1,371.9		—
FINANCIAL LIABILITIES
Deposits	116,164.0		116,207.6		—		116,207.6		—
Federal Funds Purchased	3,045.4		3,045.4		—		3,045.4		—
Securities Sold Under Agreements to Repurchase	784.7		784.7		—		784.7		—
Other Borrowings	6,567.8		6,607.4		—		6,607.4		—
Senior Notes	2,773.2		2,798.1		—		2,798.1		—
Long-Term Debt	4,065.0		4,186.8		—		4,186.8		—
Unfunded Commitments	178.8		178.8		—		178.8		—
Other Liabilities	74.9		74.9		—		—		74.9

	DECEMBER 31, 2022
					ESTIMATED FAIR VALUE
(In Millions)	BOOK VALUE		TOTAL ESTIMATED FAIR VALUE		LEVEL 1		LEVEL 2		LEVEL 3
FINANCIAL ASSETS
Cash and Due from Banks	$	4,654.2	$	4,654.2	$	4,654.2	$	—	$	—
Federal Reserve and Other Central Bank Deposits	40,030.4		40,030.4		—		40,030.4		—
Interest-Bearing Deposits with Banks	1,941.1		1,941.1		—		1,941.1		—
Federal Funds Sold	32.0		32.0		—		32.0		—
Securities Purchased under Agreements to Resell	1,070.3		1,070.3		—		1,070.3		—
Debt Securities - Held to Maturity	25,036.1		22,879.3		50.0		22,829.3		—
Loans
Held for Investment	42,749.0		42,636.5		—		—		42,636.5
Other Assets	1,476.9		1,460.4		94.7		1,365.7		—
FINANCIAL LIABILITIES
Deposits(1)	123,932.1		123,926.9		—		123,926.9		—
Federal Funds Purchased	1,896.9		1,896.9		—		1,896.9		—
Securities Sold Under Agreements to Repurchase	567.2		567.2		—		567.2		—
Other Borrowings	7,592.3		7,592.8		—		7,592.8		—
Senior Notes	2,724.2		2,729.8		—		2,729.8		—
Long-Term Debt	2,066.2		2,110.7		—		2,110.7		—
Unfunded Commitments	218.9		218.9		—		218.9		—
Other Liabilities	73.2		73.2		—		—		73.2

(1) Northern Trust reclassified its leveling interpretation on client deposits, moving Demand, Noninterest-Bearing, Savings, Money Market and Other Interest-Bearing from Level 1 to Level 2 during 2023, and collapsed client deposits into one row.

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 115

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Note 4 – Securities

Available for Sale Debt Securities. The following tables provide the amortized cost, fair values, and remaining maturities of AFS debt securities.

TABLE 56: RECONCILIATION OF AMORTIZED COST TO FAIR VALUE OF AVAILABLE FOR SALE DEBT SECURITIES

	DECEMBER 31, 2023
(In Millions)	AMORTIZED COST		GROSS UNREALIZED GAINS		GROSS UNREALIZED LOSSES		FAIR VALUE
U.S. Government	$	3,681.5	$	2.2	$	61.5	$	3,622.2
Obligations of States and Political Subdivisions	315.8		—		20.0		295.8
Government Sponsored Agency	11,744.3		9.0		200.3		11,553.0
Non-U.S. Government	284.8		—		20.4		264.4
Corporate Debt	287.5		0.1		8.1		279.5
Covered Bonds	356.8		—		9.7		347.1
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	3,013.8		0.1		114.0		2,899.9
Other Asset-Backed	3,061.0		1.6		100.0		2,962.6
Commercial Mortgage-Backed	913.5		0.2		48.4		865.3
Total	$	23,659.0	$	13.2	$	582.4	$	23,089.8

	DECEMBER 31, 2022
(In Millions)	AMORTIZED COST		GROSS UNREALIZED GAINS		GROSS UNREALIZED LOSSES		FAIR VALUE
U.S. Government	$	2,837.7	$	2.5	$	92.8	$	2,747.4
Obligations of States and Political Subdivisions	817.8		—		30.2		787.6
Government Sponsored Agency	11,892.5		4.3		351.6		11,545.2
Non-U.S. Government	387.6		—		27.6		360.0
Corporate Debt	1,774.3		0.2		26.9		1,747.6
Covered Bonds	403.1		0.3		14.7		388.7
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	2,645.8		0.3		166.7		2,479.4
Other Asset-Backed	5,544.3		—		288.1		5,256.2
Commercial Mortgage-Backed	1,456.9		0.1		69.2		1,387.8
Total	$	27,760.0	$	7.7	$	1,067.8	$	26,699.9

TABLE 57: REMAINING MATURITY OF AVAILABLE FOR SALE DEBT SECURITIES

DECEMBER 31, 2023	ONE YEAR OR LESS				ONE TO FIVE YEARS				FIVE TO TEN YEARS				OVER TEN YEARS				TOTAL
(In Millions)	Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value
U.S. Government	$	198.3	$	197.8	$	3,483.2	$	3,424.4	$	—	$	—	$	—	$	—	$	3,681.5	$	3,622.2
Obligations of States and Political Subdivisions	—		—		113.2		106.8		202.6		189.0		—		—		315.8		295.8
Government Sponsored Agency	2,384.3		2,357.0		5,330.2		5,237.5		3,327.0		3,282.8		702.8		675.7		11,744.3		11,553.0
Non-U.S. Government	67.9		66.1		216.9		198.3		—		—		—		—		284.8		264.4
Corporate Debt	105.2		103.8		182.3		175.7		—		—		—		—		287.5		279.5
Covered Bonds	90.3		89.2		266.5		257.9		—		—		—		—		356.8		347.1
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	280.3		277.8		2,665.8		2,567.1		67.7		55.0		—		—		3,013.8		2,899.9
Other Asset-Backed	218.1		212.8		2,724.2		2,631.1		107.8		107.8		10.9		10.9		3,061.0		2,962.6
Commercial Mortgage-Backed	41.9		39.3		736.0		708.2		135.6		117.8		—		—		913.5		865.3
Total	$	3,386.3	$	3,343.8	$	15,718.3	$	15,307.0	$	3,840.7	$	3,752.4	$	713.7	$	686.6	$	23,659.0	$	23,089.8

Note: Mortgage-backed and asset-backed securities are included in the above table taking into account anticipated future prepayments.

116 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Available for Sale Debt Securities with Unrealized Losses. The following table provides information regarding AFS debt securities with no credit losses reported that had been in a continuous unrealized loss position for less than twelve months and for twelve months or longer as of December 31, 2023 and 2022.

TABLE 58: AVAILABLE FOR SALE DEBT SECURITIES IN UNREALIZED LOSS POSITION WITH NO CREDIT LOSSES REPORTED

AS OF DECEMBER 31, 2023	LESS THAN 12 MONTHS				12 MONTHS OR LONGER				TOTAL
(In Millions)	FAIR VALUE		UNREALIZED LOSSES		FAIR VALUE		UNREALIZED LOSSES		FAIR VALUE		UNREALIZED LOSSES
U.S. Government	$	—	$	—	$	3,364.7	$	61.5	$	3,364.7	$	61.5
Obligations of States and Political Subdivisions	87.8		5.9		208.0		14.1		295.8		20.0
Government Sponsored Agency	331.0		11.5		9,486.6		188.8		9,817.6		200.3
Non-U.S. Government	—		—		264.5		20.4		264.5		20.4
Corporate Debt	4.4		0.1		143.0		2.1		147.4		2.2
Covered Bonds	—		—		213.2		9.7		213.2		9.7
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	—		—		2,477.0		105.8		2,477.0		105.8
Other Asset-Backed	19.8		2.0		1,998.7		98.0		2,018.5		100.0
Commercial Mortgage-Backed	60.0		4.6		776.6		43.8		836.6		48.4
Total	$	503.0	$	24.1	$	18,932.3	$	544.2	$	19,435.3	$	568.3

Note: Three corporate debt AFS securities with a fair value of $98.4 million and unrealized losses of $5.9 million and one sub-sovereign, supranational and non-U.S. agency bonds AFS security with a fair value of $71.0 million and unrealized loss of $8.2 million have been excluded from the table above as these AFS securities have a $1.2 million allowance for credit losses reported as of December 31, 2023. Refer to the discussion further below and Note 6, “Allowance for Credit Losses” for further information.

AS OF DECEMBER 31, 2022	LESS THAN 12 MONTHS				12 MONTHS OR LONGER				TOTAL
(In Millions)	FAIR VALUE		UNREALIZED LOSSES		FAIR VALUE		UNREALIZED LOSSES		FAIR VALUE		UNREALIZED LOSSES
U.S. Government	$	1,123.6	$	64.1	$	343.1	$	28.7	$	1,466.7	$	92.8
Obligations of States and Political Subdivisions	160.0		16.8		120.6		13.4		280.6		30.2
Government Sponsored Agency	7,631.4		262.1		2,737.7		89.5		10,369.1		351.6
Non-U.S. Government	235.4		17.3		124.6		10.3		360.0		27.6
Corporate Debt	427.3		14.6		130.3		2.8		557.6		17.4
Covered Bonds	238.0		13.5		42.8		1.2		280.8		14.7
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	1,305.4		74.4		807.1		83.2		2,112.5		157.6
Other Asset-Backed	3,873.4		217.5		1,247.6		70.6		5,121.0		288.1
Commercial Mortgage-Backed	670.9		47.4		215.6		21.8		886.5		69.2
Total	$	15,665.4	$	727.7	$	5,769.4	$	321.5	$	21,434.8	$	1,049.2

Note: Three corporate debt AFS securities with a fair value of $93.8 million and unrealized losses of $9.5 million and one sub-sovereign, supranational and non-U.S. agency bonds AFS security with a fair value of $68.3 million and unrealized loss of $9.1 million have been excluded from the table above as these AFS securities have a $1.3 million allowance for credit losses reported as of December 31, 2022. Refer to the discussion further below and Note 6, “Allowance for Credit Losses” for further information.

As of December 31, 2023, 898 AFS debt securities with a combined fair value of $19.4 billion were in an unrealized loss position without an allowance for credit losses, with their unrealized losses totaling $568.3 million. As of December 31, 2023, unrealized losses in AFS debt securities of $200.3 million, $105.8 million, and $100.0 million related to government sponsored agency, sub-sovereign, supranational and non-U.S. agency bonds, and other asset-backed, respectively, which are primarily attributable to lower yields and tighter spreads.

As of December 31, 2022, 1,030 AFS debt securities with a combined fair value of $21.4 billion were in an unrealized loss position without an allowance for credit losses, with their unrealized losses totaling $1.0 billion. As of December 31, 2022, unrealized losses in AFS debt securities of $351.6 million, $288.1 million, and $157.6 million related to government-sponsored agency, other asset-backed, and sub-sovereign, supranational and non-U.S. agency bonds, respectively, which are primarily attributable to changes in market interest rates and credit spreads since their purchase.

AFS debt securities impairment reviews are conducted quarterly to identify and evaluate securities that have indications of possible credit losses. A determination as to whether a security’s decline in market value is related to credit impairment takes into consideration numerous factors and the relative significance of any single factor can vary by security. Factors Northern Trust considers in determining whether impairment is credit-related include, but are not limited to, the severity of the impairment; the cause of the impairment; the financial condition and near-term prospects of the issuer; activity in the market of the issuer, which may indicate adverse credit conditions; Northern Trust’s intent regarding the sale of the security as of the balance sheet date; and the likelihood that Northern Trust will not be required to sell the

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 117

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

security for a period of time sufficient to allow for the recovery of the security’s amortized cost basis. For each security meeting the requirements of Northern Trust’s internal screening process, an extensive review is conducted to determine if a credit loss has occurred.

As of December 31, 2022, the Corporation intended to sell certain AFS debt securities that were in an unrealized loss position. The securities were written down to their fair value of $2.1 billion with a $213.0 million loss recognized in Investment Security Gains (Losses), net on the consolidated statements of income for the period ended December 31, 2022. In January 2023, the securities were subsequently sold, resulting in an incremental $6.9 million gain upon sale. In November 2023, the Corporation sold an additional $3.2 billion of AFS securities with a fair value of $3.0 billion, which resulted in a $176.4 million loss recognized in Investment Securities Gains (Losses), net on the consolidated statements of income for the period ended December 31, 2023.

There was a $1.2 million allowance for credit losses for AFS securities for the year ended December 31, 2023, primarily for corporate debt securities, reflecting a $0.1 million release from December 31, 2022. There was a $1.3 million allowance for credit losses for AFS securities for the year ended December 31, 2022, primarily for corporate debt securities, reflecting an increase of $1.3 million from December 31, 2021. The process for identifying credit losses for AFS securities is based on the best estimate of cash flows to be collected from the security, discounted using the security’s effective interest rate. If the present value of the expected cash flows is found to be less than the current amortized cost of the security, an allowance for credit losses is generally recorded equal to the difference between the two amounts, limited to the amount the amortized cost basis exceeds the fair value of the security. For additional information, please refer to Note 6, “Allowance for Credit Losses.”

Held to Maturity Debt Securities. The following tables provide the amortized cost, fair values and remaining maturities of held to maturity (HTM) debt securities.

TABLE 59: RECONCILIATION OF AMORTIZED COST TO FAIR VALUES OF HELD TO MATURITY DEBT SECURITIES

	DECEMBER 31, 2023
(In Millions)	AMORTIZED COST		GROSS UNREALIZED GAINS		GROSS UNREALIZED LOSSES		FAIR VALUE
U.S. Government	$	—	$	—	$	—	$	—
Obligations of States and Political Subdivisions	2,563.9		0.5		72.4		2,492.0
Government Sponsored Agency	9,355.3		2.3		1,012.4		8,345.2
Non-U.S. Government	4,789.1		0.2		90.7		4,698.6
Corporate Debt	646.1		—		28.2		617.9
Covered Bonds	2,208.6		0.3		108.3		2,100.6
Certificates of Deposit	585.1		—		0.7		584.4
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	5,245.5		3.2		294.9		4,953.8
Other Asset-Backed	214.2		0.4		0.2		214.4
Commercial Mortgage-Backed	37.6		—		0.8		36.8
Other	576.3		—		147.0		429.3
Total	$	26,221.7	$	6.9	$	1,755.6	$	24,473.0

	DECEMBER 31, 2022
(In Millions)	AMORTIZED COST		GROSS UNREALIZED GAINS		GROSS UNREALIZED LOSSES		FAIR VALUE
U.S. Government	$	50.0	$	—	$	—	$	50.0
Obligations of States and Political Subdivisions	2,565.3		—		149.8		2,415.5
Government Sponsored Agency	9,407.7		—		1,076.0		8,331.7
Non-U.S. Government	3,234.0		0.1		133.8		3,100.3
Corporate Debt	713.3		—		45.4		667.9
Covered Bonds	2,530.3		0.3		158.7		2,371.9
Certificates of Deposit	35.9		—		—		35.9
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	5,703.3		1.0		436.1		5,268.2
Other Asset-Backed	263.7		—		1.0		262.7
Other	532.6		—		157.4		375.2
Total	$	25,036.1	$	1.4	$	2,158.2	$	22,879.3

118 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

As of December 31, 2023, the $26.2 billion HTM debt securities portfolio had unrealized losses of $1.0 billion and $294.9 million related to government sponsored agency and sub-sovereign, supranational and non-U.S. agency bonds, respectively, which are primarily attributable to lower yields and tighter spreads. As of December 31, 2022, the $25.0 billion HTM debt securities portfolio had unrealized losses of $1.1 billion and $436.1 million related to government-sponsored agency and sub-sovereign, supranational and non-U.S. agency bonds, respectively, which are primarily attributable to changes in overall market interest rates and credit spreads since their purchase.

TABLE 60: REMAINING MATURITY OF HELD TO MATURITY DEBT SECURITIES

DECEMBER 31, 2023	ONE YEAR OR LESS				ONE TO FIVE YEARS				FIVE TO TEN YEARS				OVER TEN YEARS				TOTAL
(In Millions)	Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value
U.S. Government	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Obligations of States and Political Subdivisions	45.7		45.3		1,100.7		1,076.8		1,126.3		1,090.8		291.2		279.1		2,563.9		2,492.0
Government Sponsored Agency	984.3		885.4		3,381.4		3,037.6		3,248.6		2,905.4		1,741.0		1,516.8		9,355.3		8,345.2
Non-U.S. Government	3,376.0		3,374.3		1,379.3		1,294.7		33.8		29.6		—		—		4,789.1		4,698.6
Corporate Debt	276.8		269.5		353.7		335.2		15.6		13.2		—		—		646.1		617.9
Covered Bonds	345.4		342.1		1,623.1		1,542.5		240.1		216.0		—		—		2,208.6		2,100.6
Certificates of Deposit	585.1		584.4		—		—		—		—		—		—		585.1		584.4
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	1,080.8		1,055.6		4,159.0		3,893.6		5.7		4.6		—		—		5,245.5		4,953.8
Other Asset-Backed	14.7		14.7		102.0		102.1		97.5		97.6		—		—		214.2		214.4
Commercial Mortgage-Backed	—		—		37.6		36.8		—		—		—		—		37.6		36.8
Other	47.8		46.7		319.0		287.9		30.7		23.5		178.8		71.2		576.3		429.3
Total	$	6,756.6	$	6,618.0	$	12,455.8	$	11,607.2	$	4,798.3	$	4,380.7	$	2,211.0	$	1,867.1	$	26,221.7	$	24,473.0

Note: Mortgage-backed and asset-backed securities are included in the above table taking into account anticipated future prepayments.

HTM debt securities consist of securities that management intends to, and Northern Trust has the ability to, hold until maturity. During the year ended December 31, 2022, for capital management purposes, the Corporation transferred government sponsored agency and obligations of states and political subdivisions securities that had a fair value of $6.6 billion from the AFS to HTM classification, all of which were transferred in the third quarter of 2022. Upon transfer of a debt security from the AFS to HTM classification, the amortized cost is reset to fair value. Any net unrealized gain or loss at the date of transfer will remain in AOCI and be amortized into Net Interest Income over the remaining life of the securities using the effective interest method. The amortization of amounts retained in AOCI will offset the effect on interest income of the amortization of the premium or discount resulting from transferring the securities at fair value.

Credit Quality Indicators. The following table provides the amortized cost of HTM debt securities by credit rating.

TABLE 61: AMORTIZED COST OF HELD TO MATURITY DEBT SECURITIES BY CREDIT RATING

	AS OF DECEMBER 31, 2023
($ In Millions)	AAA			AA			A			BBB			NOT RATED			TOTAL
U.S. Government	$	—		$	—		$	—		$	—		$	—		$	—
Obligations of States and Political Subdivisions	954.7			1,609.0			—			—			0.2			2,563.9
Government Sponsored Agency	9,355.3			—			—			—			—			9,355.3
Non-U.S. Government	813.3			1,179.6			2,463.3			332.9			—			4,789.1
Corporate Debt	2.1			302.6			341.4			—			—			646.1
Covered Bonds	2,208.6			—			—			—			—			2,208.6
Certificates of Deposit	545.9			—			—			—			39.2			585.1
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	4,047.9			1,166.5			30.0			1.1			—			5,245.5
Other Asset-Backed	214.2			—			—			—			—			214.2
Commercial Mortgage-Backed	37.6			—			—			—			—			37.6
Other	54.8			—			—			—			521.5			576.3
Total	$	18,234.4		$	4,257.7		$	2,834.7		$	334.0		$	560.9		$	26,221.7
Percent of Total	70		%	16		%	11		%	1		%	2		%	100		%

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 119

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

	AS OF DECEMBER 31, 2022
($ In Millions)	AAA			AA			A			BBB			NOT RATED			TOTAL
U.S. Government	$	50.0		$	—		$	—		$	—		$	—		$	50.0
Obligations of States and Political Subdivisions	926.8			1,638.5			—			—			—			2,565.3
Government Sponsored Agency	9,407.7			—			—			—			—			9,407.7
Non-U.S. Government	762.2			926.5			1,223.0			322.3			—			3,234.0
Corporate Debt	2.1			305.7			405.5			—			—			713.3
Covered Bonds	2,530.3			—			—			—			—			2,530.3
Certificates of Deposit	—			—			—			—			35.9			35.9
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	4,171.3			1,502.0			28.9			1.1			—			5,703.3
Other Asset-Backed	263.7			—			—			—			—			263.7
Other	65.8			—			—			—			466.8			532.6
Total	$	18,179.9		$	4,372.7		$	1,657.4		$	323.4		$	502.7		$	25,036.1
Percent of Total	73		%	17		%	7		%	1		%	2		%	100		%

Credit quality indicators are metrics that provide information regarding the relative credit risk of debt securities. Northern Trust maintains a high quality debt securities portfolio, with 97% of the HTM portfolio composed of securities rated A or higher as of both December 31, 2023 and 2022. The remaining HTM debt securities portfolio was composed of 1% rated BBB at both December 31, 2023 and 2022, and 2% not rated by Moody’s, S&P Global, or Fitch Ratings at both December 31, 2023 and 2022. Securities not explicitly rated were grouped where possible under the credit rating of the issuer of the security.

Investment Security Gains and Losses. There was a $176.4 million available for sale debt security loss arising from a repositioning of the portfolio during the fourth quarter of 2023 and a $6.9 million gain upon sale of certain available for sale debt securities in the first quarter of 2023. During the fourth quarter of 2022, losses of $213.0 million were recognized in conjunction with the intent to sell certain AFS debt securities which is included in the tables below. Proceeds of $5.2 billion, $138.7 million and $116.7 million in 2023, 2022 and 2021, respectively, from the sale of debt securities resulted in the following pre-tax Investment Security Gains (Losses), net shown in the following tables.

TABLE 62: INVESTMENT SECURITY GAINS AND LOSSES

	DECEMBER 31,
(In Millions)	2023		2022		2021
Gross Realized Debt Securities Gains	$	10.5	$	—	$	1.4
Gross Realized Debt Securities Losses	(180.0)		(214.0)		(1.7)
Investment Security Gains (Losses), net(1)	$	(169.5)	$	(214.0)	$	(0.3)

(1) $214.0 million of Investment Security Gains (Losses), net includes a $213.0 million loss recognized in 2022 in conjunction with the intent to sell certain AFS debt securities.

TABLE 63: INVESTMENT SECURITY GAINS AND LOSSES BY SECURITY TYPE

	DECEMBER 31,
(In Millions)	2023		2022		2021
U.S. Governments	$	(29.9)	$	—	$	—
Obligations of States and Political Subdivisions	9.8		(95.8)		—
Government Sponsored Agency	(73.2)		—		—
Corporate Debt	(7.6)		(67.3)		(0.3)
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	(9.1)		—		—
Other Asset-Backed	(58.6)		(17.1)		—
Commercial Mortgage-Backed	(0.9)		(33.8)		—
Investment Security Gains (Losses), net(1)	$	(169.5)	$	(214.0)	$	(0.3)

(1) $214.0 million of Investment Security Gains (Losses), net includes a $213.0 million loss recognized in 2022 in conjunction with the intent to sell certain AFS debt securities.

120 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Note 5 – Loans

Amounts outstanding for Loans, by segment and class, are shown in the following table.

TABLE 64: LOANS

	DECEMBER 31,
(In Millions)	2023		2022
Commercial
Commercial and Institutional(1)	$	11,555.3	$	12,415.0
Commercial Real Estate	5,134.2		4,773.0
Non-U.S.(1)	2,778.5		3,131.1
Other	5,944.8		1,316.5
Total Commercial	25,412.8		21,635.6
Personal
Private Client	14,360.0		14,119.0
Residential Real Estate	6,327.1		6,413.5
Non-U.S.	428.8		510.0
Other	1,088.3		215.2
Total Personal	22,204.2		21,257.7
Total Loans	$	47,617.0	$	42,893.3

(1) Commercial and institutional and commercial-non-U.S. combined include $4.5 billion and $5.6 billion of private equity capital call finance loans at December 31, 2023 and 2022, respectively.

Residential real estate loans consist of traditional first lien mortgages and equity credit lines that generally require a loan-to-collateral value ratio of 65% to 80% at inception. Northern Trust’s equity credit line products generally have draw periods of up to 10 years and a balloon payment of any outstanding balance is due at maturity. Payments are interest-only with variable interest rates. Northern Trust does not offer equity credit lines that include an option to convert the outstanding balance to an amortizing payment loan. As of December 31, 2023 and 2022, equity credit lines totaled $228.7 million and $248.6 million, respectively. Equity credit lines for which first liens were held by Northern Trust represented 96% and 98% of the total equity credit lines as of December 31, 2023 and 2022, respectively.

Included within the other commercial, non-U.S. commercial, and other personal classes are short duration advances, primarily related to the processing of custodied client investments, totaling $8.4 billion and $2.9 billion at December 31, 2023 and 2022, respectively. The $8.4 billion short duration advances at December 31, 2023 primarily reflected higher levels of year-end trading and settlement activity. Demand deposit overdrafts reclassified as loan balances, primarily in personal-other, totaled $12.1 million and $24.4 million at December 31, 2023 and 2022, respectively. There were no loans classified as held for sale on either December 31, 2023 or December 31, 2022. Loans classified as held for sale are recorded at the lower of cost or fair value. There was a $2.5 million commercial real estate loan sold during the year ended December 31, 2023. There were $11.2 million of loans sold during the year ended December 31, 2022, which were composed of residential real estate and commercial and institutional loans.

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 121

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Credit Quality Indicators. Credit quality indicators are statistics, measurements or other metrics that provide information regarding the relative credit risk of loans. Northern Trust uses a variety of credit quality indicators to assess the credit risk of loans at the segment, class, and individual credit exposure levels.

As part of its credit process, Northern Trust utilizes an internal borrower risk rating system to support identification, approval, and monitoring of credit risk. Borrower risk ratings are used in credit underwriting and management reporting. Risk ratings are used for ranking the credit risk of borrowers and their probability of default. Each borrower is rated using one of a number of ratings models, which consider both quantitative and qualitative factors. The ratings models vary among classes of loans in order to capture the unique risk characteristics inherent within each particular type of credit exposure. Provided below are the more significant performance indicator attributes considered within Northern Trust’s borrower rating models, by loan class:

•Commercial and Institutional: leverage, profit margin, liquidity, asset size and capital levels;

•Commercial Real Estate: debt service coverage, loan-to-value ratio, leasing status and guarantor support;

•Commercial-Other: leverage, profit margin, liquidity, asset size and capital levels;

•Non-U.S.: leverage, profit margin, liquidity, return on assets and capital levels;

•Residential Real Estate: payment history, credit bureau scores and loan-to-value ratio;

•Private Client: cash-flow-to-debt and net worth ratios, leverage and liquidity; and

•Personal-Other: cash-flow-to-debt and net worth ratios.

While the criteria vary by model, the objective is for the borrower ratings to be consistent in both the measurement and ranking of risk. Each model is calibrated to a master rating scale to support this consistency. Ratings for borrowers not in default range from “1” for the strongest credits to “7” for the weakest non-defaulted credits. Ratings of “8” or “9” are used for defaulted borrowers. Borrower risk ratings are monitored and are revised when events or circumstances indicate a change is required. Risk ratings are generally validated at least annually.

Loans in the “1 to 3” category are expected to exhibit minimal to modest probabilities of default and are characterized by borrowers having the strongest financial qualities, including above average financial flexibility, cash flows and capital levels. Borrowers assigned these ratings are anticipated to experience very little to moderate financial pressure in adverse down-cycle scenarios. As a result of these characteristics, borrowers within this category exhibit a minimal to modest likelihood of loss. Loans in the “4 to 5” category are expected to exhibit moderate to acceptable probabilities of default and are characterized by borrowers with less financial flexibility than those in the “1 to 3” category. Cash flows and capital levels are generally sufficient to allow for borrowers to meet current requirements, but have fewer financial resources to manage through economic downturns. As a result of these characteristics, borrowers within this category exhibit a moderate likelihood of loss. Loans in the watch list category have elevated credit risk profiles that are monitored through internal watch lists, and consist of credits with borrower ratings of “6 to 9.” These credits, which include all nonaccrual credits, are expected to exhibit probabilities of default, elevated risk of default, or are currently in default. Borrowers associated with these risk profiles that are not currently in default have limited financial flexibility. Cash flows and capital levels range from acceptable to potentially insufficient to meet current requirements, particularly in adverse down cycle scenarios. As a result of these characteristics, borrowers in this category exhibit an elevated to probable likelihood of loss.

Loan segment and class balances as of December 31, 2023 are provided in the following table, segregated by borrower ratings into “1 to 3,” “4 to 5” and “6 to 9” (watch list and nonaccrual status) categories by year of origination at amortized cost basis. Loans that are held for investment are reported at the principal amount outstanding, net of unearned income.

122 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

TABLE 65: CREDIT QUALITY INDICATOR AT AMORTIZED COST BASIS BY ORIGINATION YEAR

DECEMBER 31, 2023	TERM LOANS												REVOLVING LOANS		REVOLVING LOANS CONVERTED TO TERM LOANS
(In Millions)	2023		2022		2021		2020		2019		PRIOR						TOTAL
Commercial
Commercial and Institutional
Risk Rating:
1 to 3 Category	$	443.9	$	534.1	$	668.3	$	78.1	$	137.2	$	409.9	$	4,909.8	$	15.0	$	7,196.3
4 to 5 Category	801.4		790.9		729.5		138.7		120.5		178.7		1,332.4		72.0		4,164.1
6 to 9 Category	13.8		70.0		60.8		12.0		0.1		1.7		34.7		1.8		194.9
Total Commercial and Institutional	1,259.1		1,395.0		1,458.6		228.8		257.8		590.3		6,276.9		88.8		11,555.3
Commercial Real Estate (CRE)
Risk Rating:
1 to 3 Category	403.6		389.9		159.1		23.9		37.8		44.8		51.0		—		1,110.1
4 to 5 Category	1,513.5		1,208.8		521.0		218.4		252.8		96.0		136.3		7.9		3,954.7
6 to 9 Category	16.1		—		30.5		—		8.2		14.6		—		—		69.4
Total CRE	1,933.2		1,598.7		710.6		242.3		298.8		155.4		187.3		7.9		5,134.2
CRE Gross Charge-offs	(0.7)		(4.4)		—		—		—		—		—		—		(5.1)
Non-U.S.
Risk Rating:
1 to 3 Category	487.9		—		43.2		65.2		34.2		3.3		760.0		—		1,393.8
4 to 5 Category	974.7		0.8		—		—		—		150.0		243.4		—		1,368.9
6 to 9 Category	1.5		14.3		—		—		—		—		—		—		15.8
Total Non-U.S.	1,464.1		15.1		43.2		65.2		34.2		153.3		1,003.4		—		2,778.5
Other
Risk Rating:
1 to 3 Category	4,313.2		—		—		—		—		—		—		—		4,313.2
4 to 5 Category	1,631.6		—		—		—		—		—		—		—		1,631.6
Total Other	5,944.8		—		—		—		—		—		—		—		5,944.8
Other Gross Charge-offs	(0.6)		—		—		—		—		—		—		—		(0.6)
Total Commercial	10,601.2		3,008.8		2,212.4		536.3		590.8		899.0		7,467.6		96.7		25,412.8
Commercial Gross Charge-offs	(1.3)		(4.4)		—		—		—		—		—		—		(5.7)
Personal
Private Client
Risk Rating:
1 to 3 Category	504.7		140.8		52.3		67.5		8.7		134.7		5,320.9		168.1		6,397.7
4 to 5 Category	290.1		488.2		655.1		100.9		158.8		44.7		5,721.5		447.8		7,907.1
6 to 9 Category	23.6		0.3		—		—		—		18.3		13.0		—		55.2
Total Private Client	818.4		629.3		707.4		168.4		167.5		197.7		11,055.4		615.9		14,360.0
Residential Real Estate (RRE)
Risk Rating:
1 to 3 Category	278.7		464.0		500.6		373.3		142.4		722.4		219.8		—		2,701.2
4 to 5 Category	191.6		694.9		717.4		686.7		290.0		805.3		170.3		—		3,556.2
6 to 9 Category	—		10.9		—		0.7		1.6		43.6		12.9		—		69.7
Total RRE	470.3		1,169.8		1,218.0		1,060.7		434.0		1,571.3		403.0		—		6,327.1
RRE Gross Charge-offs	(0.8)		—		—		—		—		(1.0)		—		—		(1.8)
Non-U.S.
Risk Rating:
1 to 3 Category	15.5		—		0.6		—		—		4.6		71.4		—		92.1
4 to 5 Category	12.7		16.0		39.2		—		16.4		8.9		236.1		7.4		336.7
Total Non-U.S.	28.2		16.0		39.8		—		16.4		13.5		307.5		7.4		428.8
Other
Risk Rating:
1 to 3 Category	461.7		—		—		—		—		—		—		—		461.7
4 to 5 Category	626.6		—		—		—		—		—		—		—		626.6
Total Other	1,088.3		—		—		—		—		—		—		—		1,088.3
Total Personal	2,405.2		1,815.1		1,965.2		1,229.1		617.9		1,782.5		11,765.9		623.3		22,204.2
Personal Gross Charge-offs	(0.8)		—		—		—		—		(1.0)		—		—		(1.8)
Total Loans	$	13,006.4	$	4,823.9	$	4,177.6	$	1,765.4	$	1,208.7	$	2,681.5	$	19,233.5	$	720.0	$	47,617.0
Total Loans Gross Charge-offs	$	(2.1)	$	(4.4)	$	—	$	—	$	—	$	(1.0)	$	—	$	—	$	(7.5)

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 123

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2022	TERM LOANS												REVOLVING LOANS		REVOLVING LOANS CONVERTED TO TERM LOANS
(In Millions)	2022		2021		2020		2019		2018		PRIOR						TOTAL
Commercial
Commercial and Institutional
Risk Rating:
1 to 3 Category	$	753.3	$	1,087.5	$	209.8	$	159.3	$	45.9	$	511.3	$	6,032.8	$	17.7	$	8,817.6
4 to 5 Category	744.1		740.6		300.8		191.1		151.4		174.7		1,102.3		32.9		3,437.9
6 to 9 Category	50.8		30.5		—		13.7		—		—		64.5		—		159.5
Total Commercial and Institutional	1,548.2		1,858.6		510.6		364.1		197.3		686.0		7,199.6		50.6		12,415.0
CRE
Risk Rating:
1 to 3 Category	318.7		227.4		123.6		123.5		39.8		39.1		113.4		3.0		988.5
4 to 5 Category	968.5		1,040.0		637.8		447.3		153.0		256.9		181.5		17.5		3,702.5
6 to 9 Category	7.7		22.7		—		49.1		—		—		2.5		—		82.0
Total CRE	1,294.9		1,290.1		761.4		619.9		192.8		296.0		297.4		20.5		4,773.0
Non-U.S.
Risk Rating:
1 to 3 Category	991.9		46.2		109.6		14.8		—		6.5		1,158.3		—		2,327.3
4 to 5 Category	459.0		—		—		—		—		214.9		89.5		1.8		765.2
6 to 9 Category	0.1		—		—		23.1		—		—		15.4		—		38.6
Total Non-U.S.	1,451.0		46.2		109.6		37.9		—		221.4		1,263.2		1.8		3,131.1
Other
Risk Rating:
1 to 3 Category	993.9		—		—		—		—		—		—		—		993.9
4 to 5 Category	322.6		—		—		—		—		—		—		—		322.6
Total Other	1,316.5		—		—		—		—		—		—		—		1,316.5
Total Commercial	5,610.6		3,194.9		1,381.6		1,021.9		390.1		1,203.4		8,760.2		72.9		21,635.6
Personal
Private Client
Risk Rating:
1 to 3 Category	395.5		159.9		50.5		313.6		13.4		18.5		5,352.5		28.2		6,332.1
4 to 5 Category	430.3		755.1		192.4		191.3		38.7		160.0		5,728.6		267.2		7,763.6
6 to 9 Category	0.9		—		0.1		—		18.6		—		3.7		—		23.3
Total Private Client	826.7		915.0		243.0		504.9		70.7		178.5		11,084.8		295.4		14,119.0
RRE
Risk Rating:
1 to 3 Category	871.6		666.7		567.7		168.1		102.9		750.8		128.4		7.9		3,264.1
4 to 5 Category	354.3		656.7		597.6		290.0		170.9		838.2		180.4		1.0		3,089.1
6 to 9 Category	—		6.8		1.5		1.1		3.7		35.9		11.3		—		60.3
Total RRE	1,225.9		1,330.2		1,166.8		459.2		277.5		1,624.9		320.1		8.9		6,413.5
Non-U.S.
Risk Rating:
1 to 3 Category	3.0		3.7		—		—		4.6		2.3		124.6		—		138.2
4 to 5 Category	24.2		40.3		—		21.3		3.2		2.9		272.0		7.8		371.7
6 to 9 Category	—		—		—		—		—		0.1		—		—		0.1
Total Non-U.S.	27.2		44.0		—		21.3		7.8		5.3		396.6		7.8		510.0
Other
Risk Rating:
1 to 3 Category	190.8		—		—		—		—		—		—		—		190.8
4 to 5 Category	24.4		—		—		—		—		—		—		—		24.4
Total Other	215.2		—		—		—		—		—		—		—		215.2
Total Personal	2,295.0		2,289.2		1,409.8		985.4		356.0		1,808.7		11,801.5		312.1		21,257.7
Total Loans	$	7,905.6	$	5,484.1	$	2,791.4	$	2,007.3	$	746.1	$	3,012.1	$	20,561.7	$	385.0	$	42,893.3

Past Due Status. Past due status is based on the length of time from the contractual due date a principal or interest payment has been past due. For disclosure purposes, loans that are 29 days past due or less are reported as current. The following table provides balances and delinquency status of accrual and nonaccrual loans by segment and class, as well as the other real estate owned and nonaccrual asset balances, as of December 31, 2023 and 2022.

124 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

TABLE 66: DELINQUENCY STATUS

	ACCRUAL														NONACCRUAL WITH NO ALLOWANCE
(In Millions)	CURRENT		30 – 59 DAYS PAST DUE		60 – 89 DAYS PAST DUE		90 DAYS OR MORE PAST DUE		TOTAL ACCRUAL		NONACCRUAL		TOTAL LOANS
December 31, 2023
Commercial
Commercial and Institutional	$	11,374.6	$	163.7	$	0.7	$	—	$	11,539.0	$	16.3	$	11,555.3	$	4.1
Commercial Real Estate	5,123.7		4.4		6.1		—		5,134.2		—		5,134.2		—
Non-U.S.	2,778.5		—		—		—		2,778.5		—		2,778.5		—
Other	5,944.8		—		—		—		5,944.8		—		5,944.8		—
Total Commercial	25,221.6		168.1		6.8		—		25,396.5		16.3		25,412.8		4.1
Personal
Private Client	14,240.0		63.9		24.8		11.0		14,339.7		20.3		14,360.0		18.3
Residential Real Estate	6,283.0		7.5		0.5		9.1		6,300.1		27.0		6,327.1		27.0
Non-U.S.	428.2		—		0.6		—		428.8		—		428.8		—
Other	1,088.3		—		—		—		1,088.3		—		1,088.3		—
Total Personal	22,039.5		71.4		25.9		20.1		22,156.9		47.3		22,204.2		45.3
Total Loans	$	47,261.1	$	239.5	$	32.7	$	20.1	$	47,553.4	$	63.6	$	47,617.0	$	49.4
					Other Real Estate Owned						$	1.5
					Total Nonaccrual Assets						$	65.1

	ACCRUAL														NONACCRUAL WITH NO ALLOWANCE
(In Millions)	CURRENT		30 – 59 DAYS PAST DUE		60 – 89 DAYS PAST DUE		90 DAYS OR MORE PAST DUE		TOTAL ACCRUAL		NONACCRUAL		TOTAL LOANS
December 31, 2022
Commercial
Commercial and Institutional	$	12,353.7	$	40.2	$	3.0	$	0.7	$	12,397.6	$	17.4	$	12,415.0	$	4.4
Commercial Real Estate	4,761.5		1.3		—		—		4,762.8		10.2		4,773.0		6.2
Non-U.S.	3,131.1		—		—		—		3,131.1		—		3,131.1		—
Other	1,316.5		—		—		—		1,316.5		—		1,316.5		—
Total Commercial	21,562.8		41.5		3.0		0.7		21,608.0		27.6		21,635.6		10.6
Personal
Private Client	13,843.5		192.3		29.9		53.3		14,119.0		—		14,119.0		—
Residential Real Estate	6,373.2		9.6		12.3		0.1		6,395.2		18.3		6,413.5		18.3
Non-U.S	509.9		—		—		0.1		510.0		—		510.0		—
Other	215.2		—		—		—		215.2		—		215.2		—
Total Personal	20,941.8		201.9		42.2		53.5		21,239.4		18.3		21,257.7		18.3
Total Loans	$	42,504.6	$	243.4	$	45.2	$	54.2	$	42,847.4	$	45.9	$	42,893.3	$	28.9
					Other Real Estate Owned						$	—
					Total Nonaccrual Assets						$	45.9

Interest income that would have been recorded for nonaccrual loans and leases in accordance with their original terms was $3.4 million in 2023, $4.1 million in 2022, and $4.6 million in 2021.

Northern Trust may obtain physical possession of real estate via foreclosure on an in-substance repossession. As of December 31, 2023 and 2022, Northern Trust held foreclosed real estate properties with an immaterial carrying value for both years as a result of obtaining physical possession. In addition, as of December 31, 2023 and 2022, Northern Trust had loans with a carrying value of $3.5 million and $1.1 million, respectively, for which formal foreclosure proceedings were in process.

Loan Modifications to Borrowers Experiencing Financial Difficulty (After the Adoption of Accounting Standards Update No. 2022-02)

The following table shows the amortized cost basis of loan modifications provided to financially distressed borrowers that impacted the respective cash flows of the underlying loans as of December 31, 2023, disaggregated by relevant class of financing receivable and type of modification provided.

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 125

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

TABLE 67: LOAN MODIFICATIONS MADE TO BORROWERS EXPERIENCING FINANCIAL DIFFICULTY

YEAR ENDED DECEMBER 31, 2023
($ In Millions)	LOAN MODIFICATION DETAIL	AMORTIZED COST BASIS		% OF TOTAL SEGMENT
Commercial(1)
Commercial and Institutional	Term extension	$	16.7	0.14	%
Commercial Real Estate	Principal and/or interest deferral	—		—
Commercial Real Estate	Combination of principal and/or interest deferral and term extension	—		—
Total Commercial		$	16.7	0.07	%
Personal(1)
Private Client	Term extension	$	—	—	%
Private Client	Principal and/or interest deferral	18.3		0.13
Residential Real Estate	Principal and/or interest deferral	1.0		0.02
Residential Real Estate	Interest rate concession	—		—
Residential Real Estate	Combination of principal and/or interest deferral and term extension	4.7		0.07
Total Personal		$	24.0	0.11	%
Total Loans		$	40.7	0.09	%

(1) Included are financially distressed modifications for which the respective loans had no amortized cost basis as of December 31, 2023 due to pay-downs or charge-offs.

The following table describes the financial effect of the modifications made to borrowers experiencing financial difficulty.

TABLE 68: FINANCIAL EFFECT OF MODIFICATIONS MADE TO BORROWERS EXPERIENCING FINANCIAL DIFFICULTY

	FINANCIAL EFFECT
PRINCIPAL AND INTEREST DEFERRAL
Commercial
Commercial Real Estate	Northern Trust provided a weighted average of 6 months payment deferrals to borrowers for total deferred principal and interest of $32.5 million.
Personal
Residential Real Estate	Northern Trust provided a weighted average of 14 months payment deferrals to borrowers for immaterial principal and interest deferral amounts.
Private Client	Northern Trust provided payment deferrals to borrowers until collateral sale is executed for total principal and interest of $18.9 million.
TERM EXTENSION
Commercial
Commercial and Institutional	Northern Trust provided weighted average term extension of 12 months.
Commercial Real Estate	Northern Trust provided weighted average term extension of 6 months.
Personal
Residential Real Estate	Northern Trust provided weighted average term extension of 9 months.
Private Client	Northern Trust provided weighted average term extension of 60 months.
INTEREST RATE CONCESSION
Personal
Residential Real Estate	Northern Trust provided a 2% reduction in the weighted average contractual interest rates.

The effectiveness of Northern Trust’s modification efforts is measured by the loans’ respective past-due status under the modified terms as of the end of the period. Of the loans that were modified since the adoption of ASU 2022-02 as of January 1, 2023, and were not performing in accordance with their modified terms and considered past due for purposes of these disclosures as of December 31, 2023, were $4.7 million 30-89 days past due and $16.2 million 90 days and greater past due. As of December 31, 2023, Northern Trust charged-off $2.0 million related to modifications to borrowers experiencing financial difficulty that had been processed since the adoption of ASU 2022-02.

There were no undrawn loan commitments or standby letters of credit issued to financially distressed borrowers for which Northern Trust had modified the payment terms of the loans as of December 31, 2023.

126 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Troubled Debt Restructurings (Prior to the Adoption of Accounting Standard Update No. 2022-02)

Prior to January 1, 2023, a loan that was modified as a concession by Northern Trust or a bankruptcy court resulting from the debtor’s financial difficulties was referred to as a troubled debt restructuring (TDR). All TDRs were reported starting in the calendar year of their restructuring. In subsequent years, a TDR may cease being reported if the loan was modified at a market rate and performed according to the modified terms for at least six payment periods. A loan that was modified at a below market rate returned to accrual status if it satisfied the six-payment-period performance requirement.

The expected credit loss was measured based upon the present value of expected future cash flows, discounted at the effective interest rate based on the original contractual rate. If a loan’s contractual interest rate varied based on subsequent changes in an independent factor, such as an index or rate, the loan’s effective interest rate was calculated based on the factor as it changed over the life of the loan. Northern Trust elected not to project changes in the factor for purposes of estimating expected future cash flows. Further, Northern Trust elected not to adjust the effective interest rate for prepayments. If the loan was collateral dependent, the expected loss was measured based on the fair value of the collateral at the reporting date. If the loan valuation was less than the recorded value of the loan, either an allowance was established or a charge-off was recorded for the difference. Smaller balance (individually less than $1 million) homogeneous loans were collectively evaluated. Northern Trust’s accounting policies for material nonaccrual loans was consistent across all classes of loans.

All loans with TDR modifications were evaluated for additional expected credit losses. The nature and extent of further deterioration in credit quality, including a subsequent default, was considered in the determination of an appropriate level of allowance for credit losses.

Included within nonaccrual loans were $35.3 million of nonaccrual TDRs, and $39.7 million of accrual TDRs as of December 31, 2022. There were $0.2 million of aggregate undrawn loan commitments and standby letters of credit at December 31, 2022, issued to borrowers with TDR modifications of loans.

TDR modifications involved extensions of term, deferrals of principal, interest rate concessions, and other modifications. Other modifications typically reflected other nonstandard terms which Northern Trust would not offer in non-troubled situations.

The following table provides, by segment and class, the number of TDR modifications of loans entered into during the year ended December 31, 2022, and the recorded investments and unpaid principal balances as of December 31, 2022.

TABLE 69: TROUBLED DEBT RESTRUCTURINGS

($ In Millions)	LOAN MODIFICATION DETAIL	NUMBER OF LOANS	RECORDED INVESTMENT		UNPAID PRINCIPAL BALANCE
December 31, 2022
Commercial
Commercial and Institutional	Interest rate concession, extension of term, and other modification	2	$	0.6	$	0.6
Commercial Real Estate	Interest rate concession and other modification	1	31.6		32.5
Total Commercial		3	32.2		33.1
Personal
Residential Real Estate	Interest rate concession, deferrals of principal, extension of term, and other modification	3	0.2		0.2
Private Client	Interest rate concession and extension of term	1	0.4		0.4
Total Personal		4	0.6		0.6
Total Loans		7	$	32.8	$	33.7

Note: Period-end balances reflect all paydowns and charge-offs during the year.

There were no loan TDR modifications during the previous twelve-month period which subsequently had a payment default during the year ended December 31, 2022.

Note 6 – Allowance for Credit Losses

Allowance and Provision for Credit Losses. The allowance for credit losses—which represents management’s best estimate of lifetime expected credit losses related to various portfolios subject to credit risk, off-balance sheet credit exposures, and specific borrower relationships—is determined by management through a disciplined credit review process. Northern Trust measures expected credit losses of financial assets with similar risk characteristics on a collective basis. A financial asset is measured individually if it does not share similar risk characteristics with other financial assets and the related allowance is determined through an individual evaluation.

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 127

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Management’s estimates utilized in establishing an appropriate level of allowance for credit losses are not dependent on any single assumption. In determining an appropriate allowance level, management evaluates numerous variables and takes into consideration past events, current conditions, and reasonable and supportable forecasts. The primary forecast provides for continued slow, but steady, economic growth, with inflation, unemployment and interest rates gradually returning to their longer-run norms. An alternative scenario is also considered, which reflects a recession that incorporates the experiences of a wider set of historical economic cycles.

The results of the credit reserve estimation methodology are reviewed quarterly by Northern Trust’s Credit Loss Reserve Committee, which receives input from Financial Risk Management, Treasury, Corporate Finance, the Economic Research Department, and each of Northern Trust’s reporting business units. The Credit Loss Reserve Committee determines the probability weights applied to each forecast approved by Northern Trust’s Macroeconomic Scenario Development Committee, and also reviews and approves qualitative adjustments to the collective allowance in line with Northern Trust’s qualitative adjustment framework.

The following table provides information regarding changes in the total allowance for credit losses.

TABLE 70: CHANGES IN THE ALLOWANCE FOR CREDIT LOSSES

	2023
(In Millions)	LOANS		UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT		HELD TO MATURITY DEBT SECURITIES		OTHER FINANCIAL ASSETS		TOTAL
Balance at Beginning of Period	$	144.3	$	38.5	$	16.0	$	0.8	$	199.6
Charge-Offs	(7.5)		—		(1.2)		—		(8.7)
Recoveries	3.7		—		—		—		3.7
Net Recoveries (Charge-Offs)	(3.8)		—		(1.2)		—		(5.0)
Provision for (Release of) Credit Losses(1)	38.2		(11.6)		(2.1)		0.1		24.6
Balance at End of Period	$	178.7	$	26.9	$	12.7	$	0.9	$	219.2

(1) The table excludes a release of credit reserves of $0.1 million for the year ended December 31, 2023 for AFS debt securities. See further detail in Note 4, “Securities.”

	2022
(In Millions)	LOANS		UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT		HELD TO MATURITY DEBT SECURITIES		OTHER FINANCIAL ASSETS		TOTAL
Balance at Beginning of Period	$	138.4	$	34.1	$	11.2	$	1.0	$	184.7
Charge-Offs	(6.0)		—		—		—		(6.0)
Recoveries	10.2		—		—		—		10.2
Net Recoveries (Charge-Offs)	4.2		—		—		—		4.2
Provision for (Release of) Credit Losses(1)	1.7		4.4		4.8		(0.2)		10.7
Balance at End of Period	$	144.3	$	38.5	$	16.0	$	0.8	$	199.6

(1) The table excludes a provision for credit losses of $1.3 million for the year ended December 31, 2022 for AFS debt securities. See further detail in Note 4, “Securities.”

	2021
(In Millions)	LOANS AND LEASES		UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT		HELD TO MATURITY DEBT SECURITIES		OTHER FINANCIAL ASSETS		TOTAL
Balance at Beginning of Period	190.7		61.1		7.3		0.8		259.9
Charge-Offs	(0.7)		—		—		—		(0.7)
Recoveries	7.0		—		—		—		7.0
Net Recoveries (Charge-Offs)	6.3		—		—		—		6.3
Provision for (Release of) Credit Losses	(58.6)		(27.0)		3.9		0.2		(81.5)
Balance at End of Period	$	138.4	$	34.1	$	11.2	$	1.0	$	184.7

128 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

The Provision for Credit Losses, excluding the release of credit reserves for available for sale debt securities of $0.1 million, was a provision of $24.6 million for the year ended December 31, 2023, as compared to a $10.7 million Provision for Credit Losses, excluding the provision for available for sale debt securities of $1.3 million, for the year ended December 31, 2022. The provision for loans was primarily due to an increase in the reserve evaluated on a collective basis, which relates to pooled financial assets sharing similar risk characteristics. The increase was primarily seen in the commercial real estate portfolio, driven by an increase in the size and duration of the portfolio, weaker economic projections for the industry, methodology updates, and credit quality deterioration on a small number of loans during the year ended December 31, 2023. The release of credit reserves in undrawn loan commitments and letters of credit during the year ended December 31, 2023 is primarily in the commercial and institutional portfolio, reflecting a combination of credit quality improvements, an improved macroeconomic outlook for that segment, and methodology updates. There were net charge-offs of $5.0 million during the year ended December 31, 2023, as compared to net recoveries of $4.2 million for the year ended December 31, 2022. For further detail, please see the Allowance for the Loan Portfolio and the Allowance for Held to Maturity Debt Securities Portfolio sections below.

For credit exposure and the associated allowance related to fee receivables, please refer to Note 16, “Revenue from Contracts with Clients.” For information related to the allowance for AFS debt securities, please refer to Note 4, “Securities.” For the allowance pertaining to all other financial assets recognized at amortized cost, which include Due from Banks, Other Central Bank Deposits, Interest Bearing Deposits with Banks, and Other Assets, please refer to the Allowance for Other Financial Assets section within this footnote.

Allowance for the Loan Portfolio. The following table provides information regarding changes in the total allowance for credit losses related to loans, including undrawn loan commitments and standby letters of credit, by segment.

TABLE 71: CHANGES IN THE ALLOWANCE FOR CREDIT LOSSES RELATED TO LOANS

	2023
	LOANS						UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
(In Millions)	COMMERCIAL		PERSONAL		TOTAL		COMMERCIAL		PERSONAL		TOTAL
Balance at Beginning of Period	$	116.2	$	28.1	$	144.3	$	36.3	$	2.2	$	38.5
Charge-Offs	(5.7)		(1.8)		(7.5)		—		—		—
Recoveries	0.2		3.5		3.7		—		—		—
Net Recoveries (Charge-Offs)	(5.5)		1.7		(3.8)		—		—		—
Provision for (Release of) Credit Losses	36.1		2.1		38.2		(11.4)		(0.2)		(11.6)
Balance at End of Period	$	146.8	$	31.9	$	178.7	$	24.9	$	2.0	$	26.9

	2022
	LOANS						UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
(In Millions)	COMMERCIAL		PERSONAL		TOTAL		COMMERCIAL		PERSONAL		TOTAL
Balance at Beginning of Period	$	105.6	$	32.8	$	138.4	$	31.4	$	2.7	$	34.1
Charge-Offs	(5.3)		(0.7)		(6.0)		—		—		—
Recoveries	2.7		7.5		10.2		—		—		—
Net Recoveries (Charge-Offs)	(2.6)		6.8		4.2		—		—		—
Provision for (Release of) Credit Losses	13.2		(11.5)		1.7		4.9		(0.5)		4.4
Balance at End of Period	$	116.2	$	28.1	$	144.3	$	36.3	$	2.2	$	38.5

	2021
	LOANS AND LEASES						UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
(In Millions)	COMMERCIAL		PERSONAL		TOTAL		COMMERCIAL		PERSONAL		TOTAL
Balance at Beginning of Period	$	142.2	$	48.5	$	190.7	$	57.6	$	3.5	$	61.1
Charge-Offs	(0.3)		(0.4)		(0.7)		—		—		—
Recoveries	0.9		6.1		7.0		—		—		—
Net Recoveries (Charge-Offs)	0.6		5.7		6.3		—		—		—
Provision for (Release of) Credit Losses	(37.2)		(21.4)		(58.6)		(26.2)		(0.8)		(27.0)
Balance at End of Period	$	105.6	$	32.8	$	138.4	$	31.4	$	2.7	$	34.1

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 129

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

The following table provides information regarding the recorded investments in loans and the allowance for credit losses for loans and undrawn loan commitments and standby letters of credit by segment as of December 31, 2023 and 2022.

TABLE 72: RECORDED INVESTMENTS IN LOANS

	DECEMBER 31, 2023						DECEMBER 31, 2022
(In Millions)	COMMERCIAL		PERSONAL		TOTAL		COMMERCIAL		PERSONAL		TOTAL
Loans
Evaluated on an Individual Basis	$	33.7	$	62.6	$	96.3	$	63.0	$	46.1	$	109.1
Evaluated on a Collective Basis	25,379.1		22,141.6		47,520.7		21,572.6		21,211.6		42,784.2
Total Loans	25,412.8		22,204.2		47,617.0		21,635.6		21,257.7		42,893.3
Allowance for Credit Losses on Loans
Evaluated on an Individual Basis	11.4		2.0		13.4		10.4		—		10.4
Evaluated on a Collective Basis	135.4		29.9		165.3		105.8		28.1		133.9
Allowance Assigned to Loans	146.8		31.9		178.7		116.2		28.1		144.3
Allowance for Undrawn Loan Commitments and Standby Letters of Credit
Evaluated on an Individual Basis	—		—		—		—		—		—
Evaluated on a Collective Basis	24.9		2.0		26.9		36.3		2.2		38.5
Allowance Assigned to Undrawn Loan Commitments and Standby Letters of Credit	24.9		2.0		26.9		36.3		2.2		38.5
Total Allowance Assigned to Loans and Undrawn Loan Commitments and Standby Letters of Credit	$	171.7	$	33.9	$	205.6	$	152.5	$	30.3	$	182.8

Allowance for Held to Maturity Debt Securities Portfolio. The following table provides information regarding changes in the total allowance for credit losses for HTM debt securities.

TABLE 73: CHANGES IN THE ALLOWANCE FOR CREDIT LOSSES RELATED TO HELD TO MATURITY DEBT SECURITIES

	2023
(In Millions)	CORPORATE DEBT		NON-U.S. GOVERNMENT		SUB-SOVEREIGN, SUPRANATIONAL, AND NON-U.S. AGENCY BONDS		OBLIGATIONS OF STATES AND POLITICAL SUBDIVISIONS(1)		COVERED BONDS		OTHER		TOTAL
Balance at Beginning of Period	$	1.9	$	3.6	$	4.0	$	1.5	$	0.1	$	4.9	$	16.0
Charge-Offs	—		—		—		—		—		(1.2)		(1.2)
Recoveries	—		—		—		—		—		—		—
Net Recoveries (Charge-Offs)	—		—		—		—		—		(1.2)		(1.2)
Provision for (Release of) Credit Losses	(1.0)		(0.1)		(1.8)		(0.3)		—		1.1		(2.1)
Balance at End of Period	$	0.9	$	3.5	$	2.2	$	1.2	$	0.1	$	4.8	$	12.7

(1) The allowance for Obligations of States and Political Subdivisions is related to (non pre-refunded) municipal securities that do not fall under Northern Trust’s zero-loss assumption.

	2022
(In Millions)	CORPORATE DEBT		NON-U.S. GOVERNMENT		SUB-SOVEREIGN, SUPRANATIONAL, AND NON-U.S. AGENCY BONDS		OBLIGATIONS OF STATES AND POLITICAL SUBDIVISIONS(1)		COVERED BONDS		OTHER		TOTAL
Balance at Beginning of Period	$	1.4	$	1.9	$	3.0	$	—	$	0.1	$	4.8	$	11.2
Provision for Credit Losses	0.5		1.7		1.0		1.5		—		0.1		4.8
Balance at End of Period	$	1.9	$	3.6	$	4.0	$	1.5	$	0.1	$	4.9	$	16.0

(1) The allowance for Obligations of States and Political Subdivisions is related to (non pre-refunded) municipal securities that do not fall under Northern Trust’s zero-loss assumption.

	2021
(In Millions)	CORPORATE DEBT		NON-U.S. GOVERNMENT		SUB-SOVEREIGN, SUPRANATIONAL, AND NON-U.S. AGENCY BONDS		OBLIGATIONS OF STATES AND POLITICAL SUBDIVISIONS		COVERED BONDS		OTHER		TOTAL
Balance at Beginning of Period	$	0.8	$	0.2	$	1.2	$	—	$	0.1	$	5.0	$	7.3
Provision for Credit Losses	0.6		1.7		1.8		—		—		(0.2)		3.9
Balance at End of Period	$	1.4	$	1.9	$	3.0	$	—	$	0.1	$	4.8	$	11.2

Allowance for Other Financial Assets. The allowance for Other Financial Assets consists of the allowance for Due from Banks, Other Central Bank Deposits, Interest Bearing Deposits with Banks, and Other Assets. Northern Trust’s portfolio is composed mostly of institutions within the “1 to 3” internal borrower rating category and is expected to exhibit minimal to

130 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

modest likelihood of loss. The Allowance for Credit Losses related to Other Financial Assets was $0.9 million and $0.8 million as of December 31, 2023 and 2022, respectively.

Accrued Interest. Accrued interest balances are reported within Other Assets on the consolidated balance sheets. Northern Trust elected not to measure an allowance for credit losses for accrued interest receivables related to its loan and securities portfolios as its policy is to write-off uncollectible accrued interest receivable balances in a timely manner. Accrued interest is written off by reversing interest income during the period the financial asset is moved from an accrual to a nonaccrual status.

The following table provides the amount of accrued interest excluded from the amortized cost basis of the following portfolios.

TABLE 74: ACCRUED INTEREST

(In Millions)	DECEMBER 31, 2023		DECEMBER 31, 2022
Loans	$	241.7	$	203.1
Debt Securities
Held to Maturity	72.0		63.2
Available for Sale	129.2		147.1
Other Financial Assets	86.0		43.8
Total	$	528.9	$	457.2

Accrued interest in 2023 increased compared to 2022, primarily due to higher interest rates. The amount of accrued interest reversed through interest income for loans and securities was immaterial during the years ended 2023 and 2022.

Note 7 – Concentrations of Credit Risk

Concentrations of credit risk exist if a number of borrowers or other counterparties are engaged in similar activities and have similar economic characteristics that would cause their ability to meet contractual obligations to be similarly affected by changes in economic or other conditions. The fact that a credit exposure falls into one of these groups does not necessarily indicate that the credit has a higher than normal degree of credit risk. These groups are: banks and bank holding companies, residential real estate, and commercial real estate.

Banks and Bank Holding Companies. At December 31, 2023, on-balance sheet credit risk to banks and bank holding companies, both U.S. and non-U.S., consisted primarily of Interest-Bearing Deposits with Banks of $1.9 billion, demand balances maintained at correspondent banks of $4.7 billion and Securities Purchased under Agreements to Resell of $0.8 billion. At December 31, 2022, on-balance sheet credit risk to banks and bank holding companies, both U.S. and non-U.S., consisted primarily of Interest-Bearing Deposits with Banks of $1.9 billion, demand balances maintained at correspondent banks of $4.6 billion, and Securities Purchased under Agreements to Resell of $1.1 billion. Credit risk associated with U.S. and non-U.S. banks and bank holding companies deemed to be counterparties by Credit Risk Management is managed by the Capital Markets Credit Committee. Credit limits are established through a review process that includes an internally-prepared financial analysis, use of an internal risk rating system and consideration of external ratings from rating agencies. Northern Trust places deposits with banks that have strong internal and external credit ratings and the average life to maturity of deposits with banks is maintained on a short-term basis in order to respond quickly to changing credit conditions.

Residential Real Estate. Residential real estate loans totaled $6.3 billion at December 31, 2023 and $6.4 billion at December 31, 2022, representing 14% and 16%, respectively, of total U.S. loans. Residential real estate loans consist of traditional first lien mortgages and equity credit lines, which generally require a loan-to-collateral value ratio of 65% to 80% at inception. Revaluations of supporting collateral are obtained upon refinancing or default or when otherwise considered warranted. Collateral revaluations for mortgages are performed by independent third parties. Legally binding undrawn commitments to extend residential real estate credit, which are primarily equity credit lines, totaled $804.2 million and $783.4 million at December 31, 2023 and 2022, respectively. The table below provides additional detail regarding residential real estate loans by geographic region.

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 131

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

TABLE 75: RESIDENTIAL REAL ESTATE LOANS BY GEOGRAPHIC REGION

	DECEMBER 31,
(In Millions)	2023		2022
Residential Real Estate by geographic region:
Florida	$	1,648.1	$	1,603.2
California	1,463.8		1,508.1
Illinois	640.3		686.9
New York	505.4		498.7
Colorado	344.1		364.2
Texas	318.7		312.4
All other(1)	1,406.7		1,440.0
Total Residential Real Estate	$	6,327.1	$	6,413.5

(1) The remainder is distributed throughout the other geographic regions within the U.S. served by Northern Trust.

Commercial Real Estate. In managing its credit exposure, management has defined a commercial real estate loan as one where: (1) the borrower’s principal business activity is the acquisition or the development of real estate for commercial purposes; (2) the principal collateral is real estate held for commercial purposes, and loan repayment is expected to flow from the operation of the property; or (3) the loan repayment is expected to flow from the sale or refinance of real estate as a normal and ongoing part of the business. Unsecured lines of credit to firms or individuals engaged in commercial real estate endeavors are included without regard to the use of loan proceeds. The commercial real estate portfolio consists of commercial mortgages and construction, acquisition and development loans extended primarily to experienced investors well known to Northern Trust. Underwriting standards generally reflect conservative loan-to-value ratios and debt service coverage requirements. Recourse to borrowers through guarantees is also generally required. Commercial mortgage financing is provided for the acquisition or refinancing of income-producing properties. Cash flows from the properties generally are sufficient to amortize the loan. These loans are primarily located in the California, Illinois, Florida, Texas, and New York markets. Construction, acquisition and development loans provide financing for commercial real estate prior to rental income stabilization. The intent is generally that the borrower will sell the project or refinance the loan through a commercial mortgage with Northern Trust or another financial institution upon completion. At December 31, 2023, legally binding commitments to extend credit and standby letters of credit to commercial real estate borrowers totaled $413.0 million and $82.1 million, respectively. At December 31, 2022, legally binding commitments to extend credit and standby letters of credit to commercial real estate borrowers totaled $449.3 million and $69.7 million, respectively.

The table below provides additional detail regarding commercial real estate loan types.

TABLE 76: COMMERCIAL REAL ESTATE LOANS

	DECEMBER 31,
(In Millions)	2023		2022
Commercial Mortgages
Office	$	1,035.1	$	1,054.0
Apartment/ Multi-family	1,633.9		1,392.7
Retail	620.9		572.2
Industrial/ Warehouse	687.1		596.2
Other	575.3		548.0
Total Commercial Mortgages	4,552.3		4,163.1
Construction, Acquisition and Development Loans	581.9		609.9
Total Commercial Real Estate Loans	$	5,134.2	$	4,773.0

132 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Note 8 – Buildings and Equipment

A summary of Buildings and Equipment is presented in the following table.

TABLE 77: BUILDINGS AND EQUIPMENT

	DECEMBER 31, 2023
(In Millions)	ORIGINAL COST		ACCUMULATED DEPRECIATION		NET BOOK VALUE
Land and Improvements	$	11.5	$	0.3	$	11.2
Buildings	253.1		141.4		111.7
Equipment	536.5		337.5		199.0
Leasehold Improvements	530.0		349.7		180.3
Total Buildings and Equipment	$	1,331.1	$	828.9	$	502.2

	DECEMBER 31, 2022
(In Millions)	ORIGINAL COST		ACCUMULATED DEPRECIATION		NET BOOK VALUE
Land and Improvements	$	11.5	$	0.3	$	11.2
Buildings	224.7		137.7		87.0
Equipment	499.7		281.9		217.8
Leasehold Improvements	514.1		329.6		184.5
Total Buildings and Equipment	$	1,250.0	$	749.5	$	500.5

The charge for depreciation amounted to $115.9 million in 2023, $110.1 million in 2022, and $110.8 million in 2021 on the consolidated statements of income.

Note 9 – Lease Commitments

As of December 31, 2023, Northern Trust was obligated under a number of non-cancelable operating leases, primarily for real estate. Certain leases contain rent escalation clauses based on market indices, renewal option clauses calling for increased rentals, and rental payments based on usage. There are no restrictions imposed by any lease agreement regarding the payment of dividends, debt financing or Northern Trust entering into further lease agreements.

The components of lease costs for the years ended December 31, 2023 and 2022 were as follows.

TABLE 78: LEASE COST COMPONENTS

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022
Operating Lease Cost	$	109.2	$	104.5
Variable Lease Cost (1)	54.7		82.2
Sublease Income	(2.7)		(2.9)
Total Lease Cost	$	161.2	$	183.8

(1) Variable Lease Cost includes rental payments based on usage, common-area maintenance costs and property taxes.

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 133

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

The following table presents a maturity analysis of lease liabilities as of December 31, 2023.

TABLE 79: MATURITY OF LEASE LIABILITIES

(In Millions)	MATURITY OF LEASE LIABILITIES
2024	$	93.2
2025	100.3
2026	85.5
2027	84.9
2028	72.8
Later Years	393.5
Total Lease Payments	830.2
Less: Imputed Interest	(137.4)
Present Value of Lease Liabilities	$	692.8

As of December 31, 2023, there were no commitments for operating leases in addition to the above that have not yet commenced.

Northern Trust uses its incremental borrowing rate to determine the present value of lease payments for operating leases. Operating lease right-of-use (ROU) assets and lease liabilities may include options to extend or terminate the lease only when it is reasonably certain that Northern Trust will exercise that option. Northern Trust elects not to separate lease and non-lease components of a contract for its real estate leases. The location and amount of ROU assets and lease liabilities recorded on the consolidated balance sheets as of December 31, 2023 and 2022 are presented in the following table.

TABLE 80: LOCATION AND AMOUNT OF LEASE ASSETS AND LIABILITIES

(In Millions)	LOCATION OF LEASE ASSETS AND LEASE LIABILITIES ON THE BALANCE SHEET	DECEMBER 31, 2023		DECEMBER 31, 2022
Assets
Operating Lease Right-of-Use Asset	Other Assets	$	522.8	$	484.8
Liabilities
Operating Lease Liability	Other Liabilities	$	692.8	$	626.2

The weighted-average remaining lease term and weighted-average discount rate applied to leases as of December 31, 2023 and 2022 were as follows:

TABLE 81: WEIGHTED-AVERAGE REMAINING LEASE TERM AND DISCOUNT RATE

	DECEMBER 31, 2023		DECEMBER 31, 2022
Operating Leases
Weighted-Average Remaining Lease Term	10.1 years		9.3 years
Weighted-Average Discount Rate	3.3	%	3.0	%

The following table provides supplemental cash flow information related to leases for the years ended December 31, 2023 and 2022.

TABLE 82: SUPPLEMENTAL CASH FLOW INFORMATION

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022
Supplemental cash flow information
Cash paid for amounts included in the measurement of lease liabilities - operating cash flows	$	91.4	$	70.3
Supplemental non-cash information
Right-of-use assets obtained in exchange for new operating lease liabilities	$	122.6	$	61.0

134 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Note 10 – Goodwill and Other Intangibles

Goodwill. Changes by reporting segment in the carrying amount of Goodwill for the years ended December 31, 2023 and 2022, including the effect of foreign exchange rates on non-U.S.-dollar denominated balances, were as follows.

TABLE 83: GOODWILL

(In Millions)	ASSET SERVICING		WEALTH MANAGEMENT		TOTAL
Balance at December 31, 2021	$	625.7	$	80.5	$	706.2
Foreign Exchange Rates	(14.7)		(0.2)		(14.9)
Balance at December 31, 2022	$	611.0	$	80.3	$	691.3
Foreign Exchange Rates	10.9		0.1		11.0
Balance at December 31, 2023	$	621.9	$	80.4	$	702.3

The goodwill impairment test is performed at least annually at the reporting-unit level. The Corporation has determined its reporting units for this purpose to be Asset Servicing and Wealth Management. Goodwill was tested for impairment during the fourth quarter of 2023 using a quantitative assessment in which the estimated fair values of the reporting units are compared to their carrying values. Impairment is deemed to exist if the carrying value of a reporting unit exceeds its estimated fair value. Based upon the quantitative assessments, there were no impairments to goodwill in 2023.

Other Intangible Assets Subject to Amortization. The gross carrying amount and accumulated amortization of other intangible assets subject to amortization as of December 31, 2023 and 2022 were as follows.

TABLE 84: OTHER INTANGIBLE ASSETS

	DECEMBER 31,
(In Millions)	2023		2022
Gross Carrying Amount	$	135.0	$	197.9
Less: Accumulated Amortization	63.4		120.3
Net Book Value	$	71.6	$	77.6

Other intangible assets consist primarily of the value of acquired client relationships and are included in Other Assets on the consolidated balance sheets. Amortization expense related to other intangible assets was $9.3 million, $9.3 million, and $14.8 million for the years ended December 31, 2023, 2022, and 2021, respectively. Amortization for the years 2024, 2025, 2026, 2027, and 2028 is estimated to be $9.5 million, $8.9 million, $8.5 million, $8.3 million, and $7.7 million, respectively.

Capitalized Software. The gross carrying amount and accumulated amortization of capitalized software as of December 31, 2023 and 2022 were as follows.

TABLE 85: CAPITALIZED SOFTWARE

	DECEMBER 31,
(In Millions)	2023		2022
Gross Carrying Amount	$	3,781.7	$	3,479.3
Less: Accumulated Amortization	1,754.2		1,517.4
Net Book Value	$	2,027.5	$	1,961.9

Capitalized software, which is included in Other Assets on the consolidated balance sheets, consists primarily of purchased software, software licenses, and allowable internal costs, including compensation relating to software developed for internal use. Fees paid for the use of software licenses that are not hosted by Northern Trust are expensed as incurred. Amortization expense, which is included in Equipment and Software on the consolidated statements of income, totaled $509.4 million in 2023, $434.2 million in 2022, and $390.1 million in 2021.

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 135

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Note 11 – Deposits

The following table provides the scheduled maturity of total time deposits in denominations of $250,000 or greater at December 31, 2023.

TABLE 86: REMAINING MATURITY OF TIME DEPOSITS $250,000 OR MORE

	DECEMBER 31, 2023
	U.S. OFFICE		NON-U.S. OFFICES
(In Millions)	CERTIFICATES OF DEPOSIT		OTHER TIME		TOTAL
1 Year or Less	$	3,394.0	$	2,580.1	$	5,974.1
Over 1 Year to 2 Years	39.3		—		39.3
Over 2 Years to 3 Years	6.7		—		6.7
Over 3 Years to 4 Years	2.1		—		2.1
Over 4 Years to 5 Years	9.9		—		9.9
Over 5 Years	—		—		—
Total	$	3,452.0	$	2,580.1	$	6,032.1

As of December 31, 2022, there were $3,721.8 million of time deposits in denominations of $250,000 or greater, of which $1,697.6 million were Certificates of Deposit and $2,024.2 million were non-U.S.

Note 12 – Senior Notes and Long-Term Debt

Senior Notes. A summary of Senior Notes outstanding at December 31, 2023 and 2022 is presented in the following table.

TABLE 87: SENIOR NOTES

	DECEMBER 31,
($ In Millions)	RATE		2023		2022
Corporation-Senior Notes
Fixed Rate Due May 2027(1)	4.00	%	$	997.6	$	995.0
Fixed Rate Due Aug. 2028(2)(3)	3.65		483.3		476.6
Fixed Rate Due May 2029(2)(3)	3.15		469.1		460.3
Fixed Rate Due May 2030(2)(3)	1.95		823.2		792.3
Total Senior Notes			$	2,773.2	$	2,724.2

(1) Redeemable within one month of maturity.

(2) Redeemable within three months of maturity.

(3) Interest rate swap contracts were entered into to modify the interest expense from fixed rates to floating rates. The swaps are recorded as fair value hedges and (decreases) increases in the carrying values of senior notes outstanding of $(219.1) million and $(264.7) million were recorded as of December 31, 2023 and 2022, respectively. See further detail in Note 25, “Derivative Financial Instruments.”

136 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Long-Term Debt. A summary of Long-Term Debt, defined as debt with original maturities of one year or more, outstanding at December 31, 2023 and 2022 is presented in the following table. We do not reclassify long-term debt to short-term borrowings within a year of maturity.

TABLE 88: LONG-TERM DEBT

			DECEMBER 31,
($ In Millions)	RATE		2023		2022
Corporation-Subordinated Debt
Fixed Rate Notes due October 2025(1)(2)	3.950	%	$	720.3	$	720.1
Fixed-to-Floating Rate Notes due May 2032(3)	3.375		349.7		349.7
Fixed Rate Notes due November 2032(4)	6.125		995.0		996.4
Total Corporation-Subordinated Debt			$	2,065.0	$	2,066.2
Federal Home Loan Bank (FHLB) Advances
FHLB Fixed Rate Advance due December 2025	5.13	%	$	30.0	$	—
FHLB Fixed Rate Advance due December 2025	5.18		570.0		—
FHLB Fixed Rate Advance due March 2026	5.13		600.0		—
FHLB Fixed Rate Advance due June 2026	5.09		800.0		—
Total FHLB Advances			$	2,000.0	$	—
Total Long-Term Debt			$	4,065.0	$	2,066.2
Long-Term Debt Qualifying as Risk-Based Capital			$	1,490.8	$	1,648.5

(1) Not redeemable prior to maturity.

(2) Interest rate swap contracts were entered into to modify the interest expense from fixed rates to floating rates. The swaps are recorded as fair value hedges and (decreases) increases in the carrying values of the subordinated notes outstanding of $(29.3) million were recorded as of December 31, 2022. See further detail in Note 25, “Derivative Financial Instruments.” There were no swaps as of December 31, 2023 as the fair value hedge was discontinued.

(3) The subordinated notes will bear interest from the date they were issued to, but excluding, May 8, 2027, at an annual rate of 3.375%, payable semi-annually in arrears. Effective February 27, 2023, the Board of Governors of the Federal Reserve adopted a final rule to implement the Adjustable Interest Rate (LIBOR) Act (the “LIBOR Act”). The final rule establishes benchmark replacements for contracts governed by U.S. law that reference certain tenors of U.S. dollar LIBOR after June 30, 2023. Pursuant to the final rule, three-month LIBOR will be replaced by the three-month CME Term SOFR Reference Rate, as administered by CME Group Benchmark Administration, Ltd. (“three-month CME Term SOFR”) plus the statutory spread adjustment of 0.26161% as set forth in the final rule. As a result, from, and including, May 8, 2027, the subordinated notes will bear interest at an annual rate equal to three-month CME Term SOFR plus 0.26161% plus 1.131%, payable quarterly in arrears. The subordinated notes are unsecured and may be redeemed, in whole but not in part, on, and only on, May 8, 2027, at a redemption price equal to 100% of the principal amount of the subordinated notes to be redeemed, plus accrued and unpaid interest, if any, up to but excluding the redemption date.

(4) Redeemable within three months of maturity.

Note 13 – Stockholders’ Equity

Preferred Stock. The Corporation is authorized to issue 10 million shares of preferred stock without par value. The Board of Directors is authorized to fix the particular designations, preferences and relative, participating, optional and other special rights and qualifications, limitations or restrictions for each series of preferred stock issued.

As of December 31, 2023, 5,000 shares of Series D Non-Cumulative Perpetual Preferred Stock (“Series D Preferred Stock”) and 16,000 shares of Series E Non-Cumulative Perpetual Preferred Stock (“Series E Preferred Stock”) were outstanding.

Series D Preferred Stock. As of December 31, 2023, the Corporation had issued and outstanding 500,000 depositary shares, each representing a 1/100th ownership interest in a share of Series D Preferred Stock, issued in August 2016. Equity related to Series D Preferred Stock as of December 31, 2023 and 2022 was $493.5 million. Shares of the Series D Preferred Stock have no par value and a liquidation preference of $100,000 per share (equivalent to $1,000 per depositary share).

Dividends on the Series D Preferred Stock, which are not mandatory, accrue and are payable on the liquidation preference amount, on a non-cumulative basis, at a rate per annum equal to (i) 4.60% from the original issue date of the Series D Preferred Stock to but excluding October 1, 2026; and (ii) a floating rate equal to three-month CME Term SOFR, plus a statutory spread adjustment of 0.26161% (as set forth in the final rule to implement the LIBOR Act) plus 3.202% from and including October 1, 2026. Fixed rate dividends are payable in arrears on the first day of April and October of each year, through and including October 1, 2026, and floating rate dividends will be payable in arrears on the first day of January, April, July and October of each year, commencing on January 1, 2027.

The Series D Preferred Stock has no maturity date and is redeemable at the Corporation’s option in whole, or in part, on any dividend payment date on or after October 1, 2026. The Series D Preferred Stock is redeemable at the Corporation’s option in whole, but not in part, including prior to October 1, 2026, within 90 days of a regulatory capital treatment event, as described in the Series D Preferred Stock Certificate of Designation.

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 137

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Shares of the Series D Preferred Stock rank senior to the Corporation’s common stock, and will rank at least equally with any other series of preferred stock it may issue (except for any senior series that may be issued with the requisite consent of the holders of the Series D Preferred Stock) and all other parity stock, with respect to the payment of dividends and distributions upon liquidation, dissolution or winding up.

Series E Preferred Stock. As of December 31, 2023, the Corporation had issued and outstanding 16 million depositary shares, each representing 1/1,000th ownership interest in a share of Series E Preferred Stock, issued in November 2019. Equity related to Series E Preferred Stock as of December 31, 2023 and 2022 was $391.4 million. Shares of the Series E Preferred Stock have no par value and a liquidation preference of $25,000 per share (equivalent to $25 per depositary share).

Dividends on the Series E Preferred Stock, which are not mandatory, accrue and are payable on the liquidation preference amount, on a non-cumulative basis, quarterly in arrears on the first day of January, April, July and October of each year, at a rate per annum equal to 4.70%. On October 17, 2023, the Corporation declared a cash dividend of $293.75 per share of Series E Preferred Stock payable on January 1, 2024, to stockholders of record as of December 15, 2023.

The Series E Preferred Stock has no maturity date and is redeemable at the Corporation’s option in whole, or in part, on any dividend payment date on or after January 1, 2025. The Series E Preferred Stock is redeemable at the Corporation’s option in whole, but not in part, including prior to January 1, 2025, within 90 days of a regulatory capital treatment event, as described in the Series E Preferred Stock Certificate of Designation.

Shares of the Series E Preferred Stock rank senior to the Corporation’s common stock, and will rank at least equally with any other series of preferred stock it may issue (except for any senior series that may be issued with the requisite consent of the holders of the Series E Preferred Stock) and all other parity stock, with respect to the payment of dividends and distributions upon liquidation, dissolution or winding up.

Common Stock. The Corporation’s current stock repurchase authorization to repurchase up to 25.0 million shares was approved by the Board of Directors in October 2021. Shares are repurchased by the Corporation to, among other things, manage the Corporation’s capital levels. Repurchased shares are used for general purposes, including the issuance of shares under stock option and other incentive plans. The repurchase authorization approved by the Board of Directors has no expiration date. During the year ended December 31, 2023, the Corporation repurchased 4,384,678 shares of common stock, including 378,130 shares withheld to satisfy tax withholding obligations related to share-based compensation, at a total cost of $347.5 million. During the year ended December 31, 2022, the Corporation repurchased 311,536 shares of common stock, all of which were shares withheld to satisfy tax withholding obligations related to share-based compensation, at a total cost of $35.4 million. During the year ended December 31, 2021, the Corporation repurchased 2,527,544 shares of common stock, including 394,326 shares withheld to satisfy tax withholding obligations related to share-based compensation, at a total cost of $267.6 million. The 2021 purchase was made pursuant to the repurchase program authorized by the Board of Directors in July 2018.

The average price paid per share for common stock repurchased in 2023, 2022, and 2021 was $79.26, $113.70, and $105.90, respectively.

An analysis of changes in the number of shares of common stock outstanding follows:

TABLE 89: SHARES OF COMMON STOCK

	2023	2022	2021
Balance at January 1	208,428,309	207,761,875	208,289,178
Incentive Plan and Awards	1,040,450	914,404	1,162,484
Stock Options Exercised	42,143	63,566	837,757
Treasury Stock Purchased	(4,384,678)	(311,536)	(2,527,544)
Balance at December 31	205,126,224	208,428,309	207,761,875

138 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Note 14 – Accumulated Other Comprehensive Income (Loss)

The following tables summarize the components of Accumulated Other Comprehensive Income (Loss) (AOCI) at December 31, 2023, 2022, and 2021, and changes during the years then ended.

TABLE 90: SUMMARY OF CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

(In Millions)	NET UNREALIZED GAINS (LOSSES) ON AVAILABLE FOR SALE DEBT SECURITIES(1)		NET UNREALIZED (LOSSES) GAINS ON CASH FLOW HEDGES		NET FOREIGN CURRENCY ADJUSTMENT		NET PENSION AND OTHER POSTRETIREMENT BENEFIT ADJUSTMENTS		TOTAL
Balance at December 31, 2020	$	641.8	$	(3.2)	$	144.7	$	(355.3)	$	428.0
Net Change	(534.7)		0.8		10.5		59.8		(463.6)
Balance at December 31, 2021	$	107.1	$	(2.4)	$	155.2	$	(295.5)	$	(35.6)
Net Change	(1,474.7)		3.6		9.4		(71.9)		(1,533.6)
Balance at December 31, 2022	$	(1,367.6)	$	1.2	$	164.6	$	(367.4)	$	(1,569.2)
Net Change	443.7		(0.4)		39.0		(51.0)		431.3
Balance at December 31, 2023	$	(923.9)	$	0.8	$	203.6	$	(418.4)	$	(1,137.9)

(1) Includes net unrealized gains (losses) on debt securities transferred from AFS to HTM. Refer to Note 4, “Securities” for further information.

TABLE 91: DETAILS OF CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

FOR THE YEAR ENDED DECEMBER 31,	2023						2022						2021
(In Millions)	PRE-TAX		TAX		AFTER TAX		PRE-TAX		TAX		AFTER TAX		PRE-TAX		TAX		AFTER TAX
Unrealized Gains (Losses) on Available for Sale Debt Securities
Unrealized Gains (Losses) on Available for Sale Debt Securities	$	319.4	$	(81.1)	$	238.3	$	(2,263.8)	$	580.2	$	(1,683.6)	$	(685.0)	$	177.5	$	(507.5)
Reclassification Adjustments for Losses (Gains) Included in Net Income:
Interest Income on Debt Securities(1)	105.6		(26.7)		78.9		65.1		(16.4)		48.7		(36.6)		9.2		(27.4)
Net Losses on Debt Securities(2)	169.5		(43.0)		126.5		214.0		(53.8)		160.2		0.3		(0.1)		0.2
Net Change	$	594.5	$	(150.8)	$	443.7	$	(1,984.7)	$	510.0	$	(1,474.7)	$	(721.3)	$	186.6	$	(534.7)
Unrealized (Losses) Gains on Cash Flow Hedges
Foreign Exchange Contracts	$	36.3	$	(9.2)	$	27.1	$	1.0	$	(0.3)	$	0.7	$	5.6	$	(1.4)	$	4.2
Reclassification Adjustment for (Gains) Losses Included in Net Income(3)	(36.8)		9.3		(27.5)		3.7		(0.8)		2.9		(4.5)		1.1		(3.4)
Net Change	$	(0.5)	$	0.1	$	(0.4)	$	4.7	$	(1.1)	$	3.6	$	1.1	$	(0.3)	$	0.8
Foreign Currency Adjustments
Foreign Currency Translation Adjustments	$	100.8	$	(1.6)	$	99.2	$	(200.1)	$	3.0	$	(197.1)	$	(133.8)	$	4.1	$	(129.7)
Long-Term Intra-Entity Foreign Currency Transaction (Losses) Gains	(0.9)		0.2		(0.7)		(2.6)		0.7		(1.9)		0.6		(0.1)		0.5
Net Investment Hedge Gains (Losses)	(77.4)		17.9		(59.5)		278.7		(70.3)		208.4		186.6		(46.9)		139.7
Net Change	$	22.5	$	16.5	$	39.0	$	76.0	$	(66.6)	$	9.4	$	53.4	$	(42.9)	$	10.5
Pension and Other Postretirement Benefit Adjustments
Net Actuarial (Losses) Gains	$	(71.4)	$	15.7	$	(55.7)	$	(163.9)	$	44.7	$	(119.2)	$	7.9	$	0.2	$	8.1
Reclassification Adjustment for Losses (Gains) Included in Net Income(4)
Amortization of Net Actuarial Loss	6.4		(1.7)		4.7		19.1		(4.7)		14.4		41.4		(10.3)		31.1
Amortization of Prior Service Cost (Credit)	—		—		—		(1.0)		0.3		(0.7)		(1.0)		0.3		(0.7)
Settlement Loss	—		—		—		44.9		(11.3)		33.6		28.3		(7.0)		21.3
Net Change	$	(65.0)	$	14.0	$	(51.0)	$	(100.9)	$	29.0	$	(71.9)	$	76.6	$	(16.8)	$	59.8
Total Net Change	$	551.5	$	(120.2)	$	431.3	$	(2,004.9)	$	471.3	$	(1,533.6)	$	(590.2)	$	126.6	$	(463.6)

(1) The before-tax reclassification adjustment is related to the unrealized gains (losses) amortization on AFS debt securities that were transferred to HTM debt securities during the second quarter of 2021 and third quarter of 2022. Refer to Note 4, “Securities” for further information.

(2) The net losses on AFS debt securities before-tax reclassification adjustment is recorded in Investment Security Gains (Losses), net on the consolidated statements of income. Refer to Note 4, “Securities” for further information.

(3) See Note 25, "Derivative Financial Instruments" for the location of the reclassification adjustment related to cash flow hedges.

(4) The pension and other postretirement benefit before-tax reclassification adjustment is recorded in Employee Benefits expense on the consolidated statements of income.

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 139

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Note 15 – Net Income per Common Share

The computations of net income per common share are presented in the following table.

TABLE 92: NET INCOME PER COMMON SHARE

	FOR THE YEAR ENDED DECEMBER 31,
($ In Millions Except Per Common Share Information)	2023		2022		2021
BASIC NET INCOME PER COMMON SHARE
Average Number of Common Shares Outstanding	207,248,094		208,309,331		208,075,522
Net Income	$	1,107.3	$	1,336.0	$	1,545.3
Less: Dividends on Preferred Stock	41.8		41.8		41.8
Net Income Applicable to Common Stock	1,065.5		1,294.2		1,503.5
Less: Earnings Allocated to Participating Securities	11.6		11.8		12.9
Earnings Allocated to Common Shares Outstanding	$	1,053.9	$	1,282.4	$	1,490.6
Basic Net Income Per Common Share	5.09		6.16		7.16
DILUTED NET INCOME PER COMMON SHARE
Average Number of Common Shares Outstanding	207,248,094		208,309,331		208,075,522
Plus Dilutive Effect of Share-based Compensation	315,652		557,933		823,708
Average Common and Potential Common Shares	207,563,746		208,867,264		208,899,230
Earnings Allocated to Common and Potential Common Shares	$	1,053.9	$	1,282.4	$	1,490.6
Diluted Net Income Per Common Share	5.08		6.14		7.14

Note: Common stock equivalents of 0.1 million for the year ended December 31, 2023, were not included in the computation of diluted net income per common share because their inclusion would have been antidilutive. For the years ended December 31, 2022 and 2021, respectively, there were de minimis and no common stock equivalents excluded in the computation of diluted net income per share.

Note 16 – Revenue from Contracts with Clients

Trust, Investment, and Other Servicing Fees. Custody and Fund Administration income is comprised of revenues received from our core asset servicing business for providing custody, fund administration, and middle-office-related services, primarily to Asset Servicing clients. Investment Management and Advisory income contains revenue received from providing asset management and related services to Wealth Management and Asset Servicing clients and to Northern Trust sponsored funds. Securities Lending income represents revenues generated from securities lending arrangements that Northern Trust enters into as agent, mainly with Asset Servicing clients. Other income largely consists of revenues received from providing employee benefit, investment risk and analytic and other services to Asset Servicing and Wealth Management clients.

Other Noninterest Income. Treasury Management income represents revenues received from providing cash and liquidity management services to Asset Servicing and Wealth Management clients. The portion of Security Commissions and Trading Income that relates to revenue from contracts with clients is primarily comprised of commissions earned from providing securities brokerage services to Wealth Management and Asset Servicing clients. The portion of Other Operating Income that relates to revenue from contracts with clients is mainly comprised of service fees for banking-related services provided to Wealth Management and Asset Servicing clients.

Performance Obligations. Clients are typically charged monthly or quarterly in arrears based on the fee arrangement agreed to with each client; payment terms will vary depending on the client and services offered.

Substantially all revenues generated from contracts with clients for asset servicing, asset management, securities lending, treasury management and banking-related services are recognized on an accrual basis, over the period in which services are provided. The nature of Northern Trust’s performance obligations is to provide a series of distinct services in which the customer simultaneously receives and consumes the benefits of the promised services as they are performed. Fee arrangements are mainly comprised of variable amounts based on market value of client assets managed and serviced, transaction volumes, number of accounts, and securities lending volume and spreads. Revenue is recognized using the output method in an amount that reflects the consideration to which Northern Trust expects to be entitled in exchange for providing each month or quarter of service. For contracts with multiple performance obligations, revenue is allocated to each performance obligation based on the price agreed to with the client, representing its relative standalone selling price.

Security brokerage revenue is primarily represented by securities commissions received in exchange for providing trade execution related services. Control is transferred at a point in time, on the trade date of the transaction, and fees are typically variable based on transaction volumes and security types.

140 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Northern Trust’s contracts with its clients are typically open-ended arrangements and are therefore considered to have an original duration of less than one year. Northern Trust has elected the practical expedient to not disclose the value of remaining performance obligations for contracts with an original expected duration of one year or less.

The following table presents revenues disaggregated by major revenue source.

TABLE 93: REVENUE DISAGGREGATION

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Noninterest Income
Trust, Investment and Other Servicing Fees
Custody and Fund Administration	$	1,805.3	$	1,816.0	$	1,917.5
Investment Management and Advisory	2,232.3		2,299.1		2,140.0
Securities Lending	83.9		81.6		76.9
Other	240.3		235.9		226.7
Total Trust, Investment and Other Servicing Fees	$	4,361.8	$	4,432.6	$	4,361.1
Other Noninterest Income
Foreign Exchange Trading Income	$	203.9	$	288.6	$	292.6
Treasury Management Fees	31.6		39.3		44.3
Security Commissions and Trading Income	135.0		136.2		140.2
Other Operating Income	228.7		191.3		243.9
Investment Security Gains (Losses), net	(169.5)		(214.0)		(0.3)
Total Other Noninterest Income	$	429.7	$	441.4	$	720.7
Total Noninterest Income	$	4,791.5	$	4,874.0	$	5,081.8

On the consolidated statements of income, Trust, Investment and Other Servicing Fees and Treasury Management Fees represent revenue from contracts with clients. For the year ended December 31, 2023, revenue from contracts with clients also includes $115.9 million of the $135.0 million total Security Commissions and Trading Income and $38.9 million of the $228.7 million total Other Operating Income. For the year ended December 31, 2022, revenue from contracts with clients also includes $116.8 million of the $136.2 million total Security Commissions and Trading Income and $37.2 million of the $191.3 million total Other Operating Income. For the year ended December 31, 2021, revenue from contracts with clients also includes $112.1 million of the $140.2 million total Security Commissions and Trading Income and $53.9 million of the $243.9 million total Other Operating Income.

Receivables Balances. The following table represents receivables balances from contracts with clients, which are included in Other Assets on the consolidated balance sheets, at December 31, 2023 and 2022.

TABLE 94: CLIENT RECEIVABLES

	DECEMBER 31,
(In Millions)	2023		2022
Trust Fees Receivable, net(1)	$	863.5	$	882.5
Other	64.9		55.4
Total Client Receivables	$	928.4	$	937.9

(1)Trust Fees Receivable is net of a $15.9 million and $13.5 million fee receivable allowance as of December 31, 2023 and 2022, respectively.

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 141

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Note 17 – Net Interest Income

The components of Net Interest Income were as follows.

TABLE 95: NET INTEREST INCOME

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Interest Income
Federal Reserve and Other Central Bank Deposits	$	1,462.3	$	472.0	$	11.3
Interest-Bearing Due from and Deposits with Banks(1)	130.1		46.6		9.1
Federal Funds Sold	0.3		0.1		—
Securities Purchased under Agreements to Resell	1,585.2		103.7		3.5
Securities – Taxable	1,534.4		899.9		658.8
– Nontaxable(2)	1.3		1.3		1.5
Loans and Leases	2,551.1		1,344.3		713.5
Other Interest-Earning Assets(3)	60.3		9.8		8.8
Total Interest Income	$	7,325.0	$	2,877.7	$	1,406.5
Interest Expense
Deposits	$	2,685.3	$	602.8	$	(61.3)
Federal Funds Purchased	256.9		34.1		(0.4)
Securities Sold under Agreements to Repurchase	1,541.1		90.7		0.2
Other Borrowings	542.5		126.2		14.2
Senior Notes	170.0		92.7		48.3
Long-Term Debt	147.2		44.0		21.1
Floating Rate Capital Debt	—		—		1.7
Total Interest Expense	$	5,343.0	$	990.5	$	23.8
Net Interest Income	$	1,982.0	$	1,887.2	$	1,382.7

(1) Interest-Bearing Due from and Deposits with Banks includes the interest-bearing component of Cash and Due from Banks and Interest-Bearing Deposits with Banks as presented on the consolidated balance sheets.

(2) Non-taxable Securities represent securities that are exempt from U.S. federal income taxes.

(3) Other Interest-Earning Assets include certain community development investments, collateral deposits with certain securities depositories and clearing houses, Federal Home Loan Bank and Federal Reserve stock, and money market investments which are classified in Other Assets on the consolidated balance sheets.

Note 18 – Other Operating Income

The components of Other Operating Income were as follows.

TABLE 96: OTHER OPERATING INCOME

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Loan Service Fees	$	83.1	$	71.5	$	66.6
Banking Service Fees	53.0		49.8		50.9
Bank Owned Life Insurance	69.5		61.0		48.5
Other Income(1)	23.1		9.0		77.9
Total Other Operating Income	$	228.7	$	191.3	$	243.9

(1) Other Income includes the mark-to-market gain or loss on derivative swap activity primarily related to the sale of certain Visa Class B common shares.

142 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Note 19 – Other Operating Expense

The components of Other Operating Expense were as follows.

TABLE 97: OTHER OPERATING EXPENSE

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Business Promotion	$	74.8	$	76.7	$	65.5
Staff Related	35.0		34.6		33.9
FDIC Insurance Premiums(1)	112.0		17.8		14.6
Charitable Contributions	15.6		19.4		18.0
Other Expenses	235.5		210.8		167.1
Total Other Operating Expense	$	472.9	$	359.3	$	299.1

(1) FDIC Insurance Premiums include the $84.6 million FDIC special assessment for the year ended December 31, 2023. This line also reflects an initial base deposit insurance assessment rate increase which began in the first quarterly assessment period of 2023.

In November 2023, the FDIC issued a final rule to implement a special assessment to recoup losses to the Deposit Insurance Fund associated with bank failures in the first half of 2023. Under the final rule, the assessment base for the special assessment is equal to an insured depository institution’s estimated uninsured domestic office deposits reported as of December 31, 2022, adjusted to exclude the first $5 billion of uninsured domestic office deposits. The final rule provides that the FDIC will collect the special assessment at a quarterly rate of 3.36 basis points over eight quarterly assessment periods, subject to change depending on any adjustments to the loss estimate, mergers, failures, or amendments to reported estimates of uninsured deposits. In conjunction with the special assessment, $84.6 million was recognized as an accrued liability and related expense in the fourth quarter of 2023. The final rule becomes effective on April 1, 2024, and the first collection, including any adjustments as described above, will be reflected on the invoice for the first quarterly assessment period of 2024, with the first payment due on June 28, 2024.

Note 20 – Income Taxes

The following table reconciles the statutory federal tax rate with the effective tax rate for the periods presented below.

TABLE 98: INCOME TAXES

	FOR THE YEAR ENDED DECEMBER 31,
	2023		2022		2021
Statutory Federal Tax Rate	21.0	%	21.0	%	21.0	%
State Taxes, net	3.4		3.3		3.4
Foreign Tax Rate Differential	0.6		0.1		0.1
Excess Tax Benefit Related to Share-Based Compensation	(0.1)		(0.2)		(0.4)
Tax Credits	(2.7)		(2.0)		(1.6)
Tax Exempt Income	(1.4)		(0.9)		(0.6)
Valuation Allowance	1.8		1.5		0.6
Other, net	1.8		1.6		0.6
Effective Tax Rate	24.4	%	24.4	%	23.1	%

Income tax expense for the year ended December 31, 2023, 2022, and 2021 was $357.5 million, $430.3 million, and $464.8 million, representing an effective tax rate of 24.4%, 24.4%, and 23.1% respectively.

For the year ended December 31, 2022, the increase in the effective tax rate was primarily driven by a higher net impact from international operations, including limitations on the U.S. foreign tax credit and reserves for uncertain tax positions, partially offset by increased tax benefits from tax-credit investments and tax-exempt income.

For the year ended December 31, 2021, the decrease in the effective tax rate was primarily driven by the lower net tax impact from international operations and $26.8 million of prior-year tax expense related to the reversal of tax benefits previously recognized through earnings.

The Corporation files income tax returns in the U.S. federal, various state, and foreign jurisdictions. The Corporation is no longer subject to income tax examinations by U.S. federal authorities before 2015, U.S. state or local tax authorities for years before 2011, or non-U.S. tax authorities for years before 2014.

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 143

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Included in Other Liabilities on the consolidated balance sheets at December 31, 2023 and 2022 were $60.7 million and $40.7 million of unrecognized tax benefits, respectively. If recognized, the amounts would reduce 2023 and 2022 income tax expense by $54.4 million and $37.4 million, respectively. A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows.

TABLE 99: UNRECOGNIZED TAX BENEFITS

(In Millions)	2023		2022		2021
Balance at January 1	$	40.7	$	25.3	$	22.4
Additions for Tax Positions Taken in the Current Year	2.1		1.7		1.2
Additions for Tax Positions Taken in Prior Years	24.0		13.7		4.2
Reductions for Tax Positions Taken in Prior Years	(5.1)		—		(2.5)
Reductions Resulting from Expiration of Statutes	(1.0)		—		—
Balance at December 31	$	60.7	$	40.7	$	25.3

It is possible that changes in the amount of unrecognized tax benefits could occur in the next 12 months due to changes in judgment related to recognition or measurement, settlements with taxing authorities, or expiration of statute of limitations. Management does not believe that future changes, if any, would have a material effect on the consolidated financial position or liquidity of Northern Trust, although they could have a material effect on operating results for a particular period.

A provision for interest and penalties of $0.2 million, net of tax, was included in the Provision for Income Taxes for the year ended December 31, 2023. This compares to a provision for interest and penalties of $11.1 million, net of tax, and a benefit of $0.4 million, net of tax, for the year ended December 31, 2022 and 2021, respectively. As of December 31, 2023 and 2022, the liability for the potential payment of interest and penalties totaled $22.7 million and $22.2 million, net of tax, respectively.

The components of the consolidated Provision for Income Taxes for each of the three years ended December 31 are as follows.

TABLE 100: PROVISION FOR INCOME TAXES

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Current Tax Provision:
Federal	$	250.5	$	357.7	$	241.5
State	63.2		84.7		74.0
Non-U.S.	92.0		130.6		147.3
Total	$	405.7	$	573.0	$	462.8
Deferred Tax Provision:
Federal	$	(54.0)	$	(126.0)	$	(11.7)
State	(1.4)		(10.7)		12.0
Non-U.S.	7.2		(6.0)		1.7
Total	$	(48.2)	$	(142.7)	$	2.0
Provision for Income Taxes	$	357.5	$	430.3	$	464.8

In addition to the amounts shown above, tax charges (benefits) have been recorded directly to Stockholders’ Equity for the following. For further detail, refer to Note 14, “Accumulated Other Comprehensive Income (Loss).”

TABLE 101: TAX CHARGES (BENEFITS) RECORDED DIRECTLY TO STOCKHOLDERS’ EQUITY

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Tax Effect of Other Comprehensive Income	$	120.2	$	(471.3)	$	(126.6)

144 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Deferred taxes result from temporary differences between the amounts reported on the consolidated financial statements and the tax bases of assets and liabilities. Deferred tax assets and liabilities have been computed as follows.

TABLE 102: DEFERRED TAX ASSETS AND LIABILITIES

	DECEMBER 31,
(In Millions)	2023		2022
Deferred Tax Liabilities:
Software Development	394.9		354.7
Depreciation and Amortization	23.9		122.6
Compensation and Benefits	—		5.2
State Taxes, net	46.8		58.3
Other Liabilities	53.4		42.1
Gross Deferred Tax Liabilities	519.0		582.9
Deferred Tax Assets:
Allowance for Credit Losses	46.2		41.8
Unrealized Losses on Securities, net	244.6		427.3
Compensation and Benefits	70.2		—
Tax Credit and Loss Carryforwards	121.2		95.3
Other Assets	116.0		143.7
Gross Deferred Tax Assets	598.2		708.1
Valuation Reserve	(121.2)		(95.3)
Deferred Tax Assets, net of Valuation Reserve	477.0		612.8
Net Deferred Tax Assets (Liabilities)	$	(42.0)	$	29.9

The Corporation generated a foreign tax credit carryforward during the years ended December 31, 2023 and 2022, expiring in 2033 and 2032, respectively. A cumulative valuation allowance related to the credit carryforward of $120.7 million and $94.9 million was recorded at December 31, 2023 and 2022, respectively, as management believes the foreign tax credit carryforwards will not be fully realized.

Northern Trust had various state net operating loss carryforwards as of December 31, 2023 and 2022. The income tax benefits associated with these loss carryforwards were approximately $0.4 million and $0.4 million as of December 31, 2023 and 2022, respectively. A valuation allowance related to the loss carryforwards of $0.4 million and $0.4 million was recorded at December 31, 2023 and 2022, respectively, as management believes the net operating losses will not be fully realized.

Note 21 – Employee Benefits

The Corporation and certain of its subsidiaries provide various benefit programs, including defined benefit pension and defined contribution plans. A description of each major plan and related disclosures are provided below.

Pension. A noncontributory qualified defined benefit pension plan covers substantially all U.S. employees of Northern Trust. Employees of certain European subsidiaries retain benefits in local defined benefit plans, although those plans are closed to new participants and to future benefit accruals. Employees continue to accrue benefits under the Swiss pension plan, which is accounted for as a defined benefit plan under U.S. GAAP.

Northern Trust also maintains a noncontributory supplemental pension plan for participants whose retirement benefits under the U.S. Qualified Plan are expected to exceed the limits imposed by federal tax law. Northern Trust has a nonqualified trust, referred to as a “Rabbi” Trust, used to hold assets designated for the funding of benefits in excess of those permitted in certain of its qualified retirement plans. This arrangement offers participants a degree of assurance for payment of benefits in excess of those permitted in the related qualified plans. As the “Rabbi” Trust assets remain subject to the claims of creditors and are not the property of the employees, they are accounted for as corporate assets and are included in Other Assets on the consolidated balance sheets. Total assets in the “Rabbi” Trust related to the nonqualified pension plan at December 31, 2023 and 2022 amounted to $90.3 million and $92.3 million, respectively. Contributions of $16.5 million and $20.7 million were made to the “Rabbi” Trust in 2023 and 2022, respectively.

The following tables set forth the status, amounts included in AOCI, and net periodic pension expense of the U.S. Qualified Plan, Non-U.S. Pension Plans, and U.S. Non-Qualified Plan. Prior service credits for the U.S. Qualified Plan were amortized on a straight-line basis over 11 years and were amortized in full as of December 31, 2022. Prior service

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 145

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

costs for the U.S. Non-Qualified Plan were amortized on a straight-line basis over 10 years and were amortized in full as of December 31, 2021.

TABLE 103: EMPLOYEE BENEFIT PLAN STATUS

	U.S. QUALIFIED PLAN						NON-U.S. PENSION PLANS						U.S. NON-QUALIFIED PLAN
($ In Millions)	2023			2022			2023			2022			2023			2022
Accumulated Benefit Obligation	$	1,015.6		$	963.3		$	143.7		$	126.2		$	94.1		$	97.4
Projected Benefit Obligation	$	1,151.7		$	1,077.7		$	148.6		$	129.0		$	109.2		$	113.6
Plan Assets at Fair Value	1,200.8			1,176.8			148.7			134.5			—			—
Funded Status at December 31	$	49.1		$	99.1		$	0.1		$	5.5		$	(109.2)		$	(113.6)
Weighted-Average Assumptions:
Discount Rates	5.03		%	5.22		%	3.12		%	3.76		%	4.95		%	5.15		%
Rate of Increase in Compensation Level	5.56			5.56			1.75			1.75			5.56			5.56
Expected Long-Term Rate of Return on Assets	7.25			7.25			3.90			3.99			N/A			N/A

TABLE 104: AMOUNTS INCLUDED IN ACCUMULATED OTHER COMPREHENSIVE INCOME

	U.S. QUALIFIED PLAN				NON-U.S. PENSION PLANS				U.S. NON-QUALIFIED PLAN
(In Millions)	2023		2022		2023		2022		2023		2022
Net Actuarial Loss	$	467.7	$	418.3	$	34.4	$	24.3	$	62.3	$	59.2
Prior Service (Credit) Cost	—		—		—		0.2		—		—
Gross Amount in Accumulated Other Comprehensive Income	467.7		418.3		34.4		24.5		62.3		59.2
Income Tax Effect	117.7		105.1		5.1		4.9		15.6		14.8
Net Amount in Accumulated Other Comprehensive Income	$	350.0	$	313.2	$	29.3	$	19.6	$	46.7	$	44.4

TABLE 105: NET PERIODIC PENSION EXPENSE

	U.S. QUALIFIED PLAN(1)													NON-U.S. PENSION PLANS									U.S. NON-QUALIFIED PLAN
($ In Millions)	2023			2022					2021					2023			2022			2021			2023			2022			2021
Service Cost	$	46.0		$	48.0				$	52.3				$	1.6		$	1.7		$	2.2		$	4.8		$	5.6		$	5.3
Interest Cost	53.9			46.3					40.4					4.8			2.5			2.2			5.3			3.9			3.7
Expected Return on Plan Assets	(100.9)			(85.7)					(79.0)					(6.7)			(3.2)			(3.2)			—			—			—
Amortization:
Net Actuarial Loss	1.5			11.4					32.4					(0.4)			0.6			1.0			5.3			7.4			8.2
Prior Service (Credit) Cost	—			(0.1)					(0.4)					—			—			0.2			—			—			0.1
Net Periodic Pension Expense	$	0.5		$	19.9				$	45.7				$	(0.7)		$	1.6		$	2.4		$	15.4		$	16.9		$	17.3
Settlement Expense	—			44.1					27.9					—			0.8			0.4			—			—			—
Total Pension Expense	$	0.5		$	64.0				$	73.6				$	(0.7)		$	2.4		$	2.8		$	15.4		$	16.9		$	17.3
Weighted-Average Assumptions:
Discount Rates	5.22		%	3.03		%	4.81	%	2.75		%	3.05	%	3.76		%	1.34		%	0.93		%	5.15		%	2.80		%	2.45		%
				5.49		%	5.22	%	3.06		%	3.03	%
Rate of Increase in Compensation Level	5.56			4.97								4.97		1.75			1.50			1.50			5.56			4.97			4.97
Expected Long-Term Rate of Return on Assets	7.25			5.25			6.00		5.25			5.00		3.99			1.79			1.28			N/A			N/A			N/A
							6.50

(1) In determining the pension expense for the U.S. Qualified Plan for 2022, Northern Trust utilized a discount rate of 3.03% as of December 31, 2021, 4.81% as of June 30, 2022, 5.49% as of September 30, 2022, and 5.22% as of December 31, 2022 and the expected long-term rate of return was 5.25% as of December 31, 2021, 6.00% as of June 30, 2022, and 6.50% as of September 30, 2022.

In determining the pension expense for the U.S. Qualified Plan for 2021, Northern Trust utilized a discount rate of 2.75% as of December 31, 2020, 3.05% as of June 30, 2021, 3.06% as of September 30, 2021, and 3.03% as of December 31, 2021 and the expected long-term rate of return was 5.25% as of both December 31, 2020 and June 30, 2021, and 5.00% as of September 31, 2021.

Northern Trust’s U.S. Qualified Plan provides participants the option to select lump-sum benefit payments upon retirement and termination of service. In the second quarter of both 2022 and 2021, it became probable that total lump-sum payments

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

during each year would exceed the settlement threshold of the sum of annual service and interest cost. Therefore, Northern Trust recognized settlement charges related to its U.S. Qualified Plan in the second, third, and fourth quarter of both 2022 and 2021, which required interim remeasurements of the U.S. Qualified Plan as of each respective quarter-end. The settlement charge represents the pro rata amount of the net loss in AOCI that is charged to income based on the proportion of the Projected Benefit Obligation settled to the total Projected Benefit Obligation and amounted to a total of $44.1 million and $27.9 million in 2022 and 2021, respectively.

The components of net periodic pension expense are included in Employee Benefits expense on the consolidated statements of income.

TABLE 106: CHANGE IN PROJECTED BENEFIT OBLIGATION

	U.S. QUALIFIED PLAN				NON-U.S. PENSION PLANS				U.S. NON-QUALIFIED PLAN
(In Millions)	2023		2022		2023		2022		2023		2022
Beginning Balance	$	1,077.7	$	1,401.3	$	129.0	$	210.1	$	113.6	$	147.7
Service Cost	46.0		48.0		1.6		1.7		4.8		5.6
Interest Cost	53.9		46.3		4.8		2.5		5.3		3.9
Employee Contributions	—		—		0.8		0.7		—		—
Plan Amendment	—		—		(0.2)		(0.3)		—		—
Actuarial Loss (Gain)	36.8		(281.2)		8.1		(64.3)		8.4		(20.0)
Settlements	—		(125.0)		—		(0.9)		—		—
Benefits Paid	(62.7)		(11.7)		(4.1)		(4.6)		(22.9)		(23.6)
Foreign Exchange Rate Changes	—		—		8.6		(15.9)		—		—
Ending Balance	$	1,151.7	$	1,077.7	$	148.6	$	129.0	$	109.2	$	113.6

Actuarial losses of $53.3 million in 2023 were primarily caused by decreases in discount rates, while actuarial gains of $365.5 million in 2022 were primarily caused by substantial increases in discount rates.

TABLE 107: ESTIMATED FUTURE BENEFIT PAYMENTS

(In Millions)	U.S. QUALIFIED PLAN		NON-U.S.PENSION PLANS		U.S. NON-QUALIFIED PLAN
2024	$	95.7	$	6.2	$	15.8
2025	99.6		4.7		16.1
2026	98.9		5.5		13.4
2027	101.2		6.5		11.2
2028	98.6		6.8		11.2
2029-2033	487.6		35.3		49.8

TABLE 108: CHANGE IN PLAN ASSETS

	U.S. QUALIFIED PLAN				NON-U.S PENSION PLANS
(In Millions)	2023		2022		2023		2022
Fair Value of Assets at Beginning of Period	$	1,176.8	$	1,708.9	$	134.5	$	198.7
Actual Return on Assets	86.8		(395.4)		5.0		(46.9)
Employer Contributions	—		—		3.9		3.6
Employee Contributions	—		—		0.8		0.7
Settlements	—		(125.0)		—		(0.9)
Benefits Paid	(62.8)		(11.7)		(4.1)		(4.6)
Foreign Exchange Rate Changes	—		—		8.6		(16.1)
Fair Value of Assets at End of Period	$	1,200.8	$	1,176.8	$	148.7	$	134.5

The minimum required and maximum deductible contributions for the U.S. Qualified Plan in 2024 are estimated to be zero and $420.0 million, respectively. The remaining 2024 maximum deductible contribution, after considering a cash contribution of $200.0 million made to the U.S. Qualified Plan during January 2024, is estimated at $220.0 million.

The investment strategy employed for Northern Trust’s U.S. Qualified Plan utilizes a dynamic glide path based on a set of pre-approved asset allocations to return-seeking and liability-hedging assets that vary in accordance with the U.S. Qualified Plan’s projected benefit obligation funded ratio. In general, as the U.S. Qualified Plan’s projected benefit

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obligation funded ratio increases beyond an established threshold, the U.S. Qualified Plan’s allocation to liability-hedging assets will increase while the allocation to return-seeking assets will decrease. Conversely, a decrease in the U.S. Qualified Plan’s projected benefit obligation funded ratio beyond an established threshold will generally result in a decrease in the U.S. Qualified Plan’s allocation to liability-hedging assets and increase in the allocation to return-seeking assets. Liability-hedging assets include U.S. long credit bonds, U.S. long government bonds, and a custom completion strategy used to hedge more closely the liability duration of projected plan benefits with bond duration across all durations. Return-seeking assets include: U.S. equity, international developed equity, emerging markets equity, real estate, high yield bonds, global listed infrastructure, emerging market debt, private equity and hedge funds. During 2022, the funded ratio fell below the threshold and in early 2023 the asset allocation of the U.S. Qualified Plan was adjusted to a stage of the glide path which allows for a greater component of return-seeking assets.

Northern Trust utilizes an asset/liability methodology to determine the investment policies that will best meet its short and long-term objectives. The process is performed by modeling current and alternative strategies for asset allocation, funding policy and actuarial methods and assumptions. The financial modeling uses projections of expected capital market returns and expected volatility of those returns to determine alternative asset mixes having the greatest probability of meeting the U.S. Qualified Plan’s investment objectives. Risk tolerance is established through careful consideration of the U.S. Qualified Plan liabilities, funded status, and corporate financial condition. The intent of this strategy is to protect the U.S. Qualified Plan’s funded status and generate returns, which in combination with voluntary contributions are expected to outpace the U.S. Qualified Plan’s liability growth over the long run.

As of December 31, 2023, the target allocation of the U.S. Qualified Plan assets consisted of 45% U.S. long credit bonds, 20% global equities (developed and emerging markets), 10% custom completion, 5% private equity, 5% high yield bonds, 4% emerging market debt, 4% global listed infrastructure, 4% private real estate, and 3% hedge funds.

Global equity investments include common stocks that are listed on an exchange and investments in commingled funds that invest primarily in publicly traded equities. Equity investments are diversified across country, region, investment style and market capitalization. Fixed income securities held include U.S. treasury securities, corporate bonds, and investments in commingled funds that invest in a diversified blend of longer duration fixed income securities; the custom completion strategy uses U.S. treasury securities and interest rate futures (or similar instruments) to align more closely with the target hedge ratio across maturities. Diversifying investments, including private equity, hedge funds, private real estate, emerging market debt, high yield bonds, and global listed infrastructure, are used judiciously to enhance long-term returns while improving portfolio diversification. Private equity assets consist primarily of investments in limited partnerships that invest in individual companies in the form of non-public equity or non-public debt positions. Direct or co-investment in non-public stock by the U.S. Qualified Plan is prohibited. The U.S. Qualified Plan’s private equity investments are limited to 20% of each of the total limited partnership or fund of funds and the maximum allowable loss cannot exceed the commitment amount. The U.S. Qualified Plan invests in one hedge fund of funds, which invests, either directly or indirectly, in diversified portfolios of funds or other pooled investment vehicles.

Investments in private real estate, high yield bonds, emerging market debt, and global listed infrastructure are designed to provide income and added diversification.

Derivatives may be used, depending on the nature of the asset class to which they relate, to gain market exposure in an efficient and timely manner, to hedge foreign currency exposure or interest rate risk, or to alter the duration of a portfolio. There were four derivatives held by the U.S. Qualified Plan at both December 31, 2023 and 2022.

Investment risk is measured and monitored on an ongoing basis through monthly liability measurements, periodic asset/liability studies, and quarterly investment portfolio reviews. Standards used to evaluate the U.S. Qualified Plan’s investment manager performance include, but are not limited to, the achievement of objectives, operation within guidelines and policy, and comparison against a benchmark. In addition, each manager of the investment funds held by the U.S. Qualified Plan is ranked against a universe of peers and compared to a benchmark. Total U.S. Qualified Plan performance analysis includes an analysis of the market environment, asset allocation impact on performance, risk and return relative to other ERISA plans, and manager impacts upon U.S. Qualified Plan performance.

The following describes the hierarchy of inputs used to measure fair value and the primary valuation methodologies used by Northern Trust for the U.S. Qualified Plan assets measured at fair value.

Level 1 – Quoted, active market prices for identical assets or liabilities. The U.S. Qualified Plan’s Level 1 assets are comprised primarily of mutual funds and domestic common stocks. The U.S. Qualified Plan’s Level 1 investments that are exchange traded are valued at the closing price reported by the respective exchanges on the day of valuation.

Level 2 – Observable inputs other than Level 1 prices, such as quoted active market prices for similar assets or liabilities, quoted prices for identical or similar assets in inactive markets, and model-derived valuations in which all significant inputs are observable in active markets. The U.S. Qualified Plan’s Level 2 assets are comprised of collective trust funds, corporate bonds, government obligations, and municipal and provincial bonds. The investments in collective trust funds fair values are calculated on a scheduled basis using the closing market prices and accruals of securities in the

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funds (total value of the funds) divided by the number of fund shares currently issued and outstanding. Redemptions of the collective trust funds occur by contract at the respective fund’s redemption date net asset value (NAV).

Level 3 – Valuation techniques in which one or more significant inputs are unobservable in the marketplace. The U.S. Qualified Plan did not hold Level 3 assets as of December 31, 2023 and 2022.

Assets valued at fair value using NAV per share - The U.S. Qualified Plan’s assets valued at fair value using NAV per share include investments in private equity funds and a hedge fund, which invest in underlying groups of investment funds or other pooled investment vehicles that are selected by the respective funds’ investment managers. The investment funds and the underlying investments held by these investment funds are valued at fair value. In determining the fair value of the underlying investments of each fund, the fund’s investment manager or general partner takes into account the estimated value reported by the underlying funds as well as any other considerations that may, in their judgment, increase or decrease such estimated value. The investments in the private equity funds and a hedge fund are considered to be long-term investments. There are no capital withdrawal options related to the investments in the private equity funds. However, capital is periodically distributed as underlying investments are sold. It is estimated that the current private equity investments would be liquidated over 1 to 15 years, depending on the vintage year of a particular fund. With sixty days advance notice, the Plan’s investment in the hedge fund can be withdrawn at the next calendar quarter end.

The U.S. Qualified Plan’s assets valued at fair value using NAV per share also include investments in real estate funds, which invest in real estate assets. The investment in properties by the real estate funds are carried at fair value, which is estimated based on the price that would be received to sell an asset in an orderly transaction between marketplace participants at the measurement date. The valuation plan for each real estate investment is subject to review on an annual basis which is based on either an external appraisal from appraisal firms or internal valuations prepared by the real estate fund’s investment advisor. The Plan’s investment in real estate funds are considered to be long-term investments and, with forty-five days advance notice, can be withdrawn at the next calendar quarter end to the extent the real estate funds have liquid assets.

As investments in the private equity funds, hedge fund, and real estate fund are valued at fair value using NAV per share, they are not required to be categorized within the fair value hierarchy.

While Northern Trust believes its valuation methods for U.S. Qualified Plan assets are appropriate and consistent with other market participants, the use of different methodologies or assumptions could have a material effect on the computation of the estimated fair values.

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The following table presents the fair values of Northern Trust’s U.S. Qualified Plan assets, by major asset category, and their level within the fair value hierarchy defined by GAAP as of December 31, 2023 and 2022.

TABLE 109: FAIR VALUE OF U.S. QUALIFIED PLAN ASSETS

	DECEMBER 31, 2023
(In Millions)	LEVEL 1		LEVEL 2		LEVEL 3		TOTAL
Domestic Common Stock	$	16.6	$	—	$	—	$	16.6
Foreign Common Stock	0.3		—		—		0.3
Domestic Corporate Bonds	—		218.2		—		218.2
Foreign Corporate Bonds	—		33.6		—		33.6
U.S. Government Obligations	—		87.5		—		87.5
Non-U.S. Government Obligations	—		14.0		—		14.0
Domestic Municipal and Provincial Bonds	—		17.2		—		17.2
Foreign Municipal and Provincial Bonds	—		0.3		—		0.3
Collective Trust Funds	—		571.5		—		571.5
Mutual Funds	80.3		—		—		80.3
Cash and Other(1)	(3.4)		—		—		(3.4)
Total Assets at Fair Value in the Fair Value Hierarchy	$	93.8	$	942.3	$	—	$	1,036.1
Assets Valued at NAV per share
Northern Trust Private Equity Funds							45.6
Northern Trust Hedge Fund							36.2
Real Estate Funds							82.9
Total Assets at Fair Value							$	1,200.8

(1) Negative balance in Cash and Other as of December 31, 2023 primarily relates to the timing of transfers between cash accounts and short-term investment funds presented in Collective Trust Funds.

	DECEMBER 31, 2022
(In Millions)	LEVEL 1		LEVEL 2		LEVEL 3		TOTAL
Domestic Common Stock	$	14.7	$	—	$	—	$	14.7
Foreign Common Stock	0.5		—		—		0.5
Domestic Corporate Bonds	—		263.6		—		263.6
Foreign Corporate Bonds	—		39.6		—		39.6
U.S. Government Obligations	—		77.5		—		77.5
Non-U.S. Government Obligations	—		13.8		—		13.8
Domestic Municipal and Provincial Bonds	—		16.8		—		16.8
Foreign Municipal and Provincial Bonds	—		0.2		—		0.2
Collective Trust Funds	—		522.3		—		522.3
Mutual Funds	61.4		—		—		61.4
Cash and Other(1)	(1.1)		—		—		(1.1)
Total Assets at Fair Value in the Fair Value Hierarchy	$	75.5	$	933.8	$	—	$	1,009.3
Assets Valued at NAV per share
Northern Trust Private Equity Funds							33.2
Northern Trust Hedge Fund							35.2
Real Estate Funds							99.1
Total Assets at Fair Value							$	1,176.8

(1) Negative balance in Cash and Other as of December 31, 2022 primarily relates to due to broker for securities purchased.

A building block approach is employed for Northern Trust’s U.S. Qualified Plan in determining the long-term rate of return for plan assets. Historical markets and long-term historical relationships between equities, fixed income and other asset classes are studied using the widely accepted capital market principle that assets with higher volatility generate a greater return over the long-run. Current market factors such as inflation expectations and interest rates are evaluated before long-term capital market assumptions are determined. The long-term portfolio rate of return is established with consideration given to diversification and rebalancing. The rate is reviewed against peer data and historical returns to verify the return is reasonable and appropriate. Based on this approach and the U.S. Qualified Plan’s target asset allocation, the expected long-term rate of return on assets as of the U.S. Qualified Plan’s December 31, 2023 measurement date was set at 7.25%.

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Defined Contribution Plans. The Corporation and its subsidiaries maintain various defined contribution plans covering substantially all employees. The Corporation’s contribution to the U.S. plan and to certain European-based plans includes a matching component. The expense associated with defined contribution plans is charged to Employee Benefits expense on the consolidated statements of income and totaled $72.4 million in 2023, $67.2 million in 2022, and $65.3 million in 2021.

Note 22 – Share-Based Compensation Plans

Northern Trust recognizes expense for the grant-date fair value of share-based compensation granted to employees and non-employee directors.

Total compensation expense for share-based payment arrangements to employees and the associated tax impacts were as follows for the periods presented.

TABLE 110: TOTAL COMPENSATION EXPENSE FOR SHARE-BASED PAYMENT ARRANGEMENTS TO EMPLOYEES

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Restricted Stock Unit Awards	$	95.7	$	96.4	$	78.2
Performance Stock Units	22.5		28.8		17.3
Total Share-Based Compensation Expense	$	118.2	$	125.2	$	95.5
Tax Benefits Recognized	$	29.9	$	31.4	$	24.0

As of December 31, 2023, there was $96.0 million of unrecognized compensation cost related to unvested share-based compensation arrangements granted under the Corporation’s share-based compensation plans. That cost is expected to be recognized as expense over a weighted-average period of approximately 3 years.

The Northern Trust Corporation 2017 Long-Term Incentive Plan (2017 Plan) is administered by the Human Capital and Compensation Committee (Committee) of the Board of Directors. All employees of the Corporation and its subsidiaries and all directors of the Corporation are eligible to receive awards under the 2017 Plan. The 2017 Plan provides for the grant of non-qualified and incentive stock options; tandem and free-standing stock appreciation rights; stock awards in the form of restricted stock, restricted stock units and other stock awards; and performance awards.

Restricted stock unit and performance stock unit grants continue to vest in accordance with the original terms of the award if the applicable employee retires after satisfying applicable age and service requirements.

Grants are outstanding under the 2017 Plan, the Northern Trust Corporation 2012 Stock Plan (2012 Plan), and the Amended and Restated Northern Trust Corporation 2002 Stock Plan (2002 Plan). The 2017 Plan was approved by stockholders in April 2017. Upon approval of the 2017 Plan, no additional shares have been or will be granted under the 2012 Plan or 2002 Plan. The total number of shares of the Corporation’s common stock authorized for issuance under the 2017 Plan is 20,000,000 plus shares forfeited under the 2012 Plan and 2002 Plan. As of December 31, 2023, shares available for future grant under the 2017 Plan, including shares forfeited under the 2012 Plan and 2002 Plan, totaled 13,718,608.

The following describes Northern Trust’s share-based payment arrangements and applies to awards under the 2017 Plan, 2012 Plan and the 2002 Plan, as applicable.

Stock Options. Stock options consist of options to purchase common stock at prices not less than 100% of the fair value thereof on the date the options are granted. Options have a maximum 10 years life and generally vest and become exercisable in 1 year to 4 years after the date of grant. All options terminate at such time as determined by the Committee and as provided in the terms and conditions of the respective option grants. There were no options granted during the years ended December 31, 2023, 2022, and 2021.

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The following table provides information about stock options granted, vested, and exercised in the years ended December 31, 2023, 2022, and 2021.

TABLE 111: STOCK OPTIONS GRANTED, VESTED, AND EXERCISED

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Grant-Date Fair Value of Stock Options Vested	$	—	$	—	$	2.2
Stock Options Exercised
Intrinsic Value as of Exercise Date	1.6		3.6		41.3
Cash Received	2.3		3.9		53.8
Tax Deduction Benefits Realized	1.6		3.5		41.3

A summary of the status of stock options at December 31, 2023, and changes during the year then ended, are presented in the following table.

TABLE 112: STATUS OF STOCK OPTIONS AND CHANGES

($ In Millions Except Per Share Information)	SHARES	WEIGHTED AVERAGE EXERCISE PRICE PER SHARE		WEIGHTED AVERAGE REMAINING CONTRACTUAL TERM (YEARS)	AGGREGATE INTRINSIC VALUE
Options Outstanding, December 31, 2022	441,547	$	72.58
Granted	—	—
Exercised	(42,143)	54.87
Forfeited, Expired or Cancelled	—	—
Options Outstanding, December 31, 2023	399,404	$	74.45	1.9	$	4.7
Options Exercisable, December 31, 2023	399,404	$	74.45	1.9	$	4.7

Restricted Stock Unit Awards. Restricted stock units may be granted to participants and entitles them to receive a payment in the Corporation’s common stock or cash and such other terms and conditions as the Committee deems appropriate. Each restricted stock unit provides the recipient the opportunity to receive one share of stock for each stock unit that vests. The restricted stock units granted in 2023 predominately vest at a rate equal to 25% per year for four years on the first day of the month following the month in which the grant date falls. Restricted stock unit grants totaled 1,166,376, 1,061,573, and 846,433, with weighted average grant-date fair values of $91.56, $110.99, and $99.31 per share, for the years ended December 31, 2023, 2022, and 2021, respectively. The total fair value of restricted stock units vested during the years ended December 31, 2023, 2022, and 2021, was $85.9 million, $75.6 million, and $89.4 million, respectively.

A summary of the status of outstanding restricted stock unit awards at December 31, 2023, and changes during the year then ended, is presented in the following table.

TABLE 113: OUTSTANDING RESTRICTED STOCK UNIT AWARDS

($ In Millions)	NUMBER	AGGREGATE INTRINSIC VALUE
Restricted Stock Unit Awards Outstanding, December 31, 2022	2,243,183	$	198.5
Granted	1,166,376
Distributed	(847,281)
Forfeited or Cancelled	(62,220)
Restricted Stock Unit Awards Outstanding, December 31, 2023	2,500,058	$	211.0
Units Convertible, December 31, 2023	18,887	$	1.6

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The following is a summary of nonvested restricted stock unit awards at December 31, 2023, and changes during the year then ended.

TABLE 114: NONVESTED RESTRICTED STOCK UNIT AWARDS

NONVESTED RESTRICTED STOCK UNITS	NUMBER	WEIGHTED AVERAGE GRANT- DATE FAIR VALUE PER UNIT		WEIGHTED AVERAGE REMAINING VESTING TERM (YEARS)
Nonvested at December 31, 2022	2,223,657	$	103.41	2.4
Granted	1,166,376	91.56
Vested	(846,642)	101.38
Forfeited or Cancelled	(62,220)	99.66
Nonvested at December 31, 2023	2,481,171	$	98.62	2.4

Performance Stock Units. Each performance stock unit provides the recipient the opportunity to receive one share of the Corporation’s common stock for each stock unit based on the attainment of certain performance criteria over a three-year period. For performance stock unit awards granted in 2021, 2022 and 2023, the number of units that will vest are subject to the attainment of specified performance targets that are a function of average return on equity goals and average return on equity performance relative to that of a performance peer group, each measured over a three-year period. For performance stock units outstanding as of December 31, 2023, the number of performance stock units that will vest ranges from 0% to 150% of the original award granted based on the achievement of both absolute and relative return on equity goals over a three-year period compared to performance targets. Distribution of the shares is then made after vesting.

Performance stock unit grants totaled 219,314, 211,906, and 204,539 for the years ended December 31, 2023, 2022, and 2021, respectively, with weighted average grant-date fair values of $93.97, $113.64, and $97.77. Performance stock units outstanding at target level performance totaled 613,450, 607,892, and 622,817 at December 31, 2023, 2022, and 2021, respectively. Performance stock units had aggregate intrinsic values of $51.8 million, $53.8 million, and $74.5 million, and weighted average remaining vesting terms of 1.0 year each at December 31, 2023, 2022, and 2021, respectively.

Non-employee Director Stock Awards. Stock units with total values of $1.6 million (20,405 units), $1.6 million (14,773 units), and $1.5 million (13,968 units) were granted to non-employee directors in 2023, 2022, and 2021, respectively, which vest or vested on the date of the annual meeting of the Corporation’s stockholders in the following years. Total expense recognized on these grants was $1.7 million, $1.7 million, and $1.6 million in 2023, 2022, and 2021, respectively. Stock units granted to non-employee directors do not have voting rights. Each stock unit entitles a director to one share of common stock at vesting, unless a director elects to defer receipt of the shares. Directors may elect to defer the payment of their annual stock unit grant and cash-based compensation until termination of services as director. Deferred cash compensation is converted into stock units representing shares of common stock of the Corporation. Distributions of deferred stock units are made in stock. For compensation deferred prior to January 1, 2018, distributions of the stock unit accounts that relate to cash-based compensation are made in cash based on the fair value of the stock units at the time of distribution. For compensation deferred on or after January 1, 2018, distributions of the stock unit accounts that relate to cash-based compensation are made in stock.

Note 23 – Cash-Based Compensation Plans

Various incentive plans provide for cash incentives and bonuses to selected employees based upon accomplishment of corporate net income objectives, goals of the reporting segments and support functions, and individual performance. The provision for awards under these plans is charged to Compensation expense and totaled $358.7 million in 2023, $392.7 million in 2022, and $377.1 million in 2021.

Note 24 – Commitments and Contingent Liabilities

Off-Balance Sheet Financial Instruments, Guarantees and Other Commitments. Northern Trust, in the normal course of business, enters into various types of commitments and issues letters of credit to meet the liquidity and credit enhancement needs of its clients. The contractual amounts of these instruments represent the maximum potential credit exposure should the instrument be fully drawn upon and the client default. To control the credit risk associated with entering into commitments and issuing letters of credit, Northern Trust subjects such activities to the same credit quality and monitoring controls as its lending activities. Northern Trust does not believe the total contractual amount of these instruments to be representative of its future credit exposure or funding requirements.

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The following table provides details of Northern Trust's off-balance sheet financial instruments as of December 31, 2023 and 2022.

TABLE 115: SUMMARY OF OFF-BALANCE SHEET FINANCIAL INSTRUMENTS

	DECEMBER 31,
	2023						2022
(In Millions)	ONE YEAR AND LESS		OVER ONE YEAR		TOTAL		ONE YEAR AND LESS		OVER ONE YEAR		TOTAL
Undrawn Commitments(1)	$	11,849.5	$	18,909.6	$	30,759.1	$	13,639.2	$	17,321.4	$	30,960.6
Standby Letters of Credit and Financial Guarantees(2)(3)	85,752.0		639.0		86,391.0		17,553.0		409.9		17,962.9
Commercial Letters of Credit	29.2		1.3		30.5		25.4		1.3		26.7
Securities Lent with Indemnification	140,539.1		—		140,539.1		130,311.0		—		130,311.0
Unsettled Reverse Repurchase Agreements	27,667.7		—		27,667.7		496.8		—		496.8
Total Off-Balance Sheet Financial Instruments	$	265,837.5	$	19,549.9	$	285,387.4	$	162,025.4	$	17,732.6	$	179,758.0

(1) These amounts exclude $222.2 million and $266.6 million of commitments participated to others at December 31, 2023 and 2022, respectively.

(2) These amounts include $39.1 million and $35.1 million of standby letters of credit secured by cash deposits or participated to others as of December 31, 2023 and 2022, respectively.

(3) This amount includes a $84.6 billion guarantee to the Fixed Income Clearing Corporation (FICC) under the sponsored member program, without taking into consideration the related collateral, as of December 31, 2023. As of December 31, 2022, there was a $16.3 billion guarantee to the FICC; Northern Trust became a sponsored member during the third quarter of 2021.

Undrawn Commitments generally have fixed expiration dates or other termination clauses. Since a significant portion of the commitments are expected to expire without being drawn upon, the total commitment amount does not necessarily represent future loans or liquidity requirements.

Standby Letters of Credit obligate Northern Trust to meet certain financial obligations of its clients, if, under the contractual terms of the agreement, the clients are unable to do so. These instruments are primarily issued to support public and private financial commitments, including commercial paper, bond financing, initial margin requirements on futures exchanges, and similar transactions. Northern Trust is obligated to meet the entire financial obligation of these agreements and in certain cases is able to recover the amounts paid through recourse against collateral received or other participants. Since the vast majority of the standby letters of credit are never drawn, the total standby letters of credit amount does not necessarily represent future loans or liquidity requirements.

Financial Guarantees are issued by Northern Trust to guarantee the performance of a client to a third party under certain arrangements.

Commercial Letters of Credit are instruments issued by Northern Trust on behalf of its clients that authorize a third party (the beneficiary) to draw drafts up to a stipulated amount under the specified terms and conditions of the agreement and other similar instruments. Commercial letters of credit are issued primarily to facilitate international trade.

Securities Lent with Indemnification involves Northern Trust lending securities owned by clients to borrowers who are reviewed and approved by the Northern Trust Capital Markets Credit Committee, as part of its securities custody activities and at the direction of its clients. In connection with these activities, Northern Trust has issued indemnifications to certain clients against certain losses that are a direct result of a borrower’s failure to return securities when due, should the value of such securities exceed the value of the collateral required to be posted. Borrowers are required to fully collateralize securities received with cash or marketable securities. As securities are loaned, collateral is maintained at a minimum of 100% of the fair value of the securities plus accrued interest. The collateral is revalued on a daily basis. The amount of securities loaned subject to indemnification as of December 31, 2023 and December 31, 2022, was $140.5 billion and $130.3 billion, respectively. Because of the credit quality of the borrowers and the requirement to fully collateralize securities borrowed, management believes that the exposure to credit loss from this activity is not significant and no liability was recorded at December 31, 2023, or 2022 related to these indemnifications.

Unsettled Repurchase and Reverse Repurchase Agreements. Northern Trust enters into repurchase agreements and reverse repurchase agreements which may settle at a future date. In repurchase agreements, Northern Trust receives cash from and provides securities as collateral to a counterparty. In reverse repurchase agreements, Northern Trust advances cash to and receives securities as collateral from a counterparty. These transactions are recorded on the consolidated balance sheets on the settlement date. As of December 31, 2023, and 2022, there were $27.7 billion and $496.8 million of unsettled reverse repurchase agreements, and no unsettled repurchase agreements, respectively.

Sponsored Member Program. Northern Trust is an approved Government Securities Division (GSD) netting and sponsoring member in the Fixed Income Clearing Corporation (FICC) sponsored member program, through which Northern Trust submits eligible repurchase and reverse repurchase transactions in U.S. government securities between Northern Trust and its sponsored member clients for novation and clearing. Northern Trust may sponsor clients to clear

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

their eligible repurchase transactions with the FICC. As a sponsoring member, Northern Trust guarantees to the FICC the prompt and full payment and performance of its sponsored member clients’ respective obligations under the FICC GSD’s rules. To mitigate Northern Trust’s credit exposure under this guarantee, Northern Trust obtains a security interest in its sponsored member clients’ collateral. Please refer to Note 27, “Offsetting of Assets and Liabilities” for additional information on Northern Trust’s repurchase and reverse repurchase agreements.

Clearing and Settlement Organizations. The Bank is a participating member of various cash, securities and foreign exchange clearing and settlement organizations. It participates in these organizations on behalf of its clients and on its own behalf as a result of its own activities. A wide variety of cash and securities transactions are settled through these organizations, including those involving U.S. Treasuries, obligations of states and political subdivisions, asset-backed securities, commercial paper, dollar placements, and securities issued by the Government National Mortgage Association.

Certain of these industry clearing and settlement exchanges require their members to guarantee their obligations and liabilities and/or to provide liquidity support in the event other members do not honor their obligations as stipulated in each clearing organization’s membership agreement. Exposure related to these agreements varies, primarily as a result of fluctuations in the volume of transactions cleared through the organizations. At December 31, 2023 and 2022, Northern Trust has not recorded any material liabilities under these arrangements as Northern Trust believes the likelihood that a clearing or settlement exchange (of which Northern Trust is a member) would become insolvent is remote. Controls related to these clearing transactions are closely monitored by management to protect the assets of Northern Trust and its clients.

Legal Proceedings. In the normal course of business, the Corporation and its subsidiaries are routinely defendants in or parties to pending and threatened legal actions, and are subject to regulatory examinations, information-gathering requests, investigations, and proceedings, both formal and informal. In certain legal actions, claims for substantial monetary damages are asserted. In regulatory matters, claims for disgorgement, restitution, penalties and/or other remedial actions or sanctions may be sought.

Based on current knowledge, after consultation with legal counsel and after taking into account current accruals, management does not believe that losses, fines or penalties, if any, arising from pending litigation or threatened legal actions or regulatory matters either individually or in the aggregate, after giving effect to applicable reserves and insurance coverage will have a material adverse effect on the consolidated financial position or liquidity of the Corporation, although such matters could have a material adverse effect on the Corporation’s operating results for a particular period.

Under GAAP, (i) an event is “probable” if the “future event or events are likely to occur”; (ii) an event is “reasonably possible” if “the chance of the future event or events occurring is more than remote but less than likely”; and (iii) an event is “remote” if “the chance of the future event or events occurring is slight.”

The outcome of litigation and regulatory matters is inherently difficult to predict and/or the range of loss often cannot be reasonably estimated, particularly for matters that (i) will be decided by a jury, (ii) are in early stages, (iii) involve uncertainty as to the likelihood of a class being certified or the ultimate size of the class, (iv) are subject to appeals or motions, (v) involve significant factual issues to be resolved, including with respect to the amount of damages, (vi) do not specify the amount of damages sought or (vii) seek very large damages based on novel and complex damage and liability legal theories. Accordingly, the Corporation cannot reasonably estimate the eventual outcome of these pending matters, the timing of their ultimate resolution or what the eventual loss, fines or penalties, if any, related to each pending matter will be.

In accordance with applicable accounting guidance, the Corporation records accruals for litigation and regulatory matters when those matters present loss contingencies that are both probable and reasonably estimable. When loss contingencies are not both probable and reasonably estimable, the Corporation does not record accruals. No material accruals have been recorded for pending litigation or threatened legal actions or regulatory matters.

For a limited number of matters for which a loss is reasonably possible in future periods, whether in excess of an accrued liability or where there is no accrued liability, the Corporation is able to estimate a range of possible loss. As of December 31, 2023, the Corporation has estimated the range of reasonably possible loss for these matters to be from zero to approximately $25 million in the aggregate. The Corporation’s estimate with respect to the aggregate range of reasonably possible loss is based upon currently available information and is subject to significant judgment and a variety of assumptions and known and unknown uncertainties. The matters underlying the estimated range will change from time to time, and actual results may vary significantly from the current estimate.

In certain other pending matters, there may be a range of reasonably possible loss (including reasonably possible loss in excess of amounts accrued) that cannot be reasonably estimated for the reasons described above. Such matters are not included in the estimated range of reasonably possible loss discussed above.

In 2015, Northern Trust Fiduciary Services (Guernsey) Limited (NTFS), an indirect subsidiary of the Corporation, was charged by a French investigating magistrate judge with complicity in estate tax fraud in connection with the administration of two trusts for which it serves as trustee. Charges also were brought against a number of other persons and

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

entities related to this matter. In 2017, a French court found no estate tax fraud had occurred and NTFS and all other persons and entities charged were acquitted. The Public Prosecutor’s Office of France appealed the court decision and in June 2018 a French appellate court issued its opinion on the matter, acquitting all persons and entities charged, including NTFS. In January 2021, the Cour de Cassation, the highest court in France, reversed the June 2018 appellate court ruling, requiring a re-trial at the appellate court level. This re-trial concluded in October 2023 and the appellate court is expected to render its verdict in March 2024. As trustee, NTFS provided no tax advice and had no involvement in the preparation or filing of the challenged estate tax filings.

Visa Class B Common Shares. Northern Trust, as a member of Visa U.S.A. Inc. (Visa U.S.A.) and in connection with the 2007 restructuring of Visa U.S.A. and its affiliates and the 2008 initial public offering of Visa Inc. (Visa), received certain Visa Class B common shares. The Visa Class B common shares are subject to certain transfer restrictions until the final resolution of certain litigation related to interchange fees involving Visa (the covered litigation), at which time the shares are convertible into Visa Class A common shares based on a conversion rate dependent upon the ultimate cost of resolving the covered litigation. Since 2018, Visa has deposited an additional $2.8 billion into an escrow account previously established with respect to the covered litigation. As a result of the additional contributions to the escrow account, the rate at which Visa Class B common shares will convert into Visa Class A common shares was reduced to 1.5875 as of December 31, 2023.

In September 2018, Visa reached a proposed class settlement agreement covering damage claims but not injunctive relief claims regarding the covered litigation. In December 2019, the district court granted final approval for the proposed class settlement agreement. In March 2023, the Second Circuit Court of Appeals affirmed the district court’s approval of the class settlement agreement. Certain merchants have opted out of the class settlement and are pursuing claims separately. The ultimate resolution of the covered litigation, the timing for removal of the selling restrictions on the Visa Class B common shares and the rate at which such shares will ultimately convert into Visa Class A common shares are uncertain.

On January 29, 2024, Visa filed a registration statement under the Securities Act of 1933 with the SEC. This registration statement has not yet become effective. If Visa commences the exchange offer contemplated by the registration statement, Visa Class B shareholders would have the option to tender some or all of their Class B shares and in return receive shares of a newly issued series of Visa Class B common shares with a value equal to half the value of the tendered shares and Visa Class C common shares with value equal to the other half of the tendered shares. The newly issued series of Visa Class B common shares would be subject to the same transfer and convertibility restrictions as the currently outstanding Visa Class B common shares. One third of the Visa Class C common shares received would be transferable within the first 45 days following the potential exchange, up to two-thirds would be transferable within the first 90 days, and all such shares would be transferable after 90 days. The Visa Class C common shares will automatically be converted at the then applicable conversion rate into shares of Visa Class A common stock if transferred to a person other than a Visa member or an affiliate of a Visa member. After the initial exchange offer, Visa could, at its discretion, conduct up to three successive potential exchange offers, in each case, if more than 12 months have passed since the previous exchange offer and after a further 50% reduction of interchange fees at issue in the unresolved claims for damages in the covered litigation.

In June 2016 and 2015, Northern Trust recorded a $123.1 million and $99.9 million net gain on the sale of 1.1 million and 1.0 million of its Visa Class B common shares, respectively. These sales do not affect Northern Trust’s risk related to the impact of the covered litigation on the rate at which such shares will ultimately convert into Visa Class A common shares. Northern Trust continued to hold approximately 4.1 million Visa Class B common shares, which are recorded at their original cost basis of zero, as of both December 31, 2023 and 2022.

Note 25 – Derivative Financial Instruments

Northern Trust is a party to various derivative financial instruments that are used in the normal course of business to meet the needs of its clients, as part of its trading activity for its own account; and as part of its risk management activities. These instruments may include foreign exchange contracts, interest rate contracts, total return swap contracts, and swaps related to the sale of certain Visa Class B common shares. Please refer to Note 1, “Summary of Significant Accounting Policies” for the significant accounting policies for derivative financial instruments.

Foreign exchange contracts are agreements to exchange specific amounts of currencies at a future date, at a specified rate of exchange. Foreign exchange contracts are entered into primarily to meet the foreign exchange needs of clients. Foreign exchange contracts are also used for trading and risk management purposes. For risk management purposes, Northern Trust uses foreign exchange contracts to reduce its exposure to changes in foreign exchange rates relating to certain forecasted non-functional-currency-denominated revenue and expenditure transactions, foreign-currency- denominated assets and liabilities, including debt securities and net investments in non-U.S. affiliates.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Interest rate contracts include swap and option contracts. Interest rate swap contracts involve the exchange of fixed and floating rate interest payment obligations without the exchange of the underlying principal amounts. Northern Trust enters into interest rate swap contracts with its clients and also may utilize such contracts to reduce or eliminate the exposure to changes in the cash flows or fair value of hedged assets or liabilities due to changes in interest rates. Interest rate option contracts may include caps, floors, collars and swaptions, and provide for the transfer or reduction of interest rate risk, typically in exchange for a fee. Northern Trust enters into option contracts primarily as a seller of interest rate protection to clients. Northern Trust receives a fee at the outset of the agreement for the assumption of the risk of an unfavorable change in interest rates. This assumed interest rate risk is then mitigated by entering into an offsetting position with an outside counterparty. Northern Trust may also purchase or enter into option contracts for risk management purposes including to reduce the exposure to changes in the cash flows of hedged assets due to changes in interest rates.

The following table shows the notional and fair values of all derivative financial instruments as of December 31, 2023

and 2022.

TABLE 116: NOTIONAL AND FAIR VALUES OF DERIVATIVE FINANCIAL INSTRUMENTS

	DECEMBER 31, 2023						DECEMBER 31, 2022
			FAIR VALUE						FAIR VALUE
(In Millions)	NOTIONAL VALUE		ASSET(1)		LIABILITY(2)		NOTIONAL VALUE		ASSET(1)		LIABILITY(2)
Derivatives Designated as Hedging under GAAP
Interest Rate Contracts
Fair Value Hedges	$	7,042.7	$	94.7	$	71.0	$	4,622.0	$	58.5	$	32.7
Foreign Exchange Contracts
Cash Flow Hedges	1,453.6		15.0		42.2		150.9		7.4		5.7
Net Investment Hedges	4,077.4		13.3		31.9		3,765.0		283.5		12.7
Total Derivatives Designated as Hedging under GAAP	$	12,573.7	$	123.0	$	145.1	$	8,537.9	$	349.4	$	51.1
Derivatives Not Designated as Hedging under GAAP
Non-Designated Risk Management Derivatives
Foreign Exchange Contracts	$	20.7	$	—	$	0.1	$	55.9	$	0.1	$	0.1
Other Financial Derivatives(3)	867.9		—		25.4		717.7		0.3		34.8
Total Non-Designated Risk Management Derivatives	$	888.6	$	—	$	25.5	$	773.6	$	0.4	$	34.9
Client-Related and Trading Derivatives
Foreign Exchange Contracts	$	313,336.9	$	3,238.4	$	3,181.0	$	288,994.6	$	3,219.1	$	3,169.0
Interest Rate Contracts	13,584.1		206.8		298.2		12,378.2		163.5		399.1
Total Client-Related and Trading Derivatives	$	326,921.0	$	3,445.2	$	3,479.2	$	301,372.8	$	3,382.6	$	3,568.1
Total Derivatives Not Designated as Hedging under GAAP	$	327,809.6	$	3,445.2	$	3,504.7	$	302,146.4	$	3,383.0	$	3,603.0
Total Gross Derivatives	$	340,383.3	$	3,568.2	$	3,649.8	$	310,684.3	$	3,732.4	$	3,654.1
Less: Netting(4)			3,126.7		2,205.4				2,810.7		1,865.9
Total Derivative Financial Instruments			$	441.5	$	1,444.4			$	921.7	$	1,788.2

(1) Derivative assets are reported in Other Assets on the consolidated balance sheets.

(2) Derivative liabilities are reported in Other Liabilities on the consolidated balance sheets.

(3) This line includes swaps related to sales of certain Visa Class B common shares and total return swap contracts.

(4) See further detail in Note 27, "Offsetting of Assets and Liabilities."

Notional amounts of derivative financial instruments do not represent credit risk, and are not recorded on the consolidated balance sheets. They are used merely to express the volume of this activity. Northern Trust’s credit-related risk of loss is limited to the positive fair value of the derivative instrument, net of any collateral received, which is significantly less than the notional amount.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Hedging Derivative Instruments Designated under GAAP. Northern Trust uses derivative instruments to hedge its exposure to foreign currency, interest rate, and equity price. Certain hedging relationships are formally designated and qualify for hedge accounting under GAAP as fair value, cash flow or net investment hedges. Other derivatives that are entered into for risk management purposes as economic hedges are not formally designated as hedges and changes in fair value are recognized currently in Other Operating Income within the consolidated statements of income (see below section “Derivative Instruments Not Designated as Hedging under GAAP”).

Fair Value Hedges. Derivatives are designated as fair value hedges to limit Northern Trust’s exposure to changes in the fair value of assets and liabilities due to movements in interest rates.

Cash Flow Hedges. Derivatives are also designated as cash flow hedges in order to minimize the variability in cash flows of earning assets or forecasted transactions caused by movements in interest or foreign exchange rates.

There were no material gains or losses reclassified into earnings during the years ended December 31, 2023, 2022, and 2021 as a result of the discontinuance of cash flow hedges of forecasted transactions that were no longer probable of occurring. It is estimated that net losses of $27.3 million will be reclassified into Net Income within the next twelve months relating to cash flow hedges of foreign-currency-denominated debt securities. As of December 31, 2023, 4 months was the maximum length of time over which the exposure to variability in future cash flows of forecasted foreign-currency-denominated debt securities was being hedged.

The following table provides fair value and cash flow hedge derivative gains and losses recognized in income during the years ended December 31, 2023, 2022 and 2021.

TABLE 117: LOCATION AND AMOUNT OF FAIR VALUE AND CASH FLOW HEDGE DERIVATIVE GAINS AND LOSSES RECORDED IN INCOME

(In Millions)	INTEREST INCOME						INTEREST EXPENSE						OTHER OPERATING INCOME
For the Year Ended December 31,	2023		2022		2021		2023		2022		2021		2023		2022		2021
Total amounts on the consolidated statements of income	$	7,325.0	$	2,877.7	$	1,406.5	$	5,343.0	$	990.5	$	23.8	$	228.7	$	191.3	$	243.9
Gains (Losses) on fair value hedges recognized on
Interest Rate Contracts
Recognized on derivatives	(132.6)		82.8		39.1		74.9		(373.4)		(161.6)		—		—		—
Recognized on hedged items	132.6		(82.8)		(39.1)		(74.9)		373.4		161.6		—		—		—
Amounts related to interest settlements on derivatives	47.1		(4.4)		(16.2)		(86.5)		24.1		57.1		—		—		—
Total gains (losses) recognized on fair value hedges	$	47.1	$	(4.4)	$	(16.2)	$	(86.5)	$	24.1	$	57.1	$	—	$	—	$	—
Gains (Losses) on cash flow hedges recognized on
Foreign Exchange Contracts
Net gains (losses) reclassified from AOCI to net income	$	34.9	$	0.6	$	10.5	$	—	$	—	$	—	$	1.9	$	(4.3)	$	(6.0)
Total gains (losses) reclassified from AOCI to net income on cash flow hedges	$	34.9	$	0.6	$	10.5	$	—	$	—	$	—	$	1.9	$	(4.3)	$	(6.0)

158 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

The following table provides the impact of fair value hedge accounting on the carrying value of the designated hedged items, which includes hedged items no longer designated.

TABLE 118: HEDGED ITEMS IN FAIR VALUE HEDGES

	DECEMBER 31, 2023				DECEMBER 31, 2022
(In Millions)	CARRYING VALUE OF THE HEDGED ITEMS		CUMULATIVE HEDGE ACCOUNTING BASIS ADJUSTMENT(1)(3)		CARRYING VALUE OF THE HEDGED ITEMS		CUMULATIVE HEDGE ACCOUNTING BASIS ADJUSTMENT(2)(3)
Available for Sale Debt Securities(4)	$	5,048.8	$	77.5	$	1,820.8	$	(60.2)
Senior Notes and Long-Term Subordinated Debt	2,495.9		(248.7)		2,746.2		(294.0)

(1) The cumulative hedge accounting basis adjustment includes $2.2 million related to discontinued hedging relationships of AFS debt securities and $29.6 million related to discontinued hedging relationships in the cumulative hedge accounting basis adjustment of senior notes and long-term debt as of December 31, 2023.

(2) The cumulative hedge accounting basis adjustment includes $7.3 million related to discontinued hedging relationships of AFS debt securities as of December 31, 2022. There were no amounts related to discontinued hedging relationships in the cumulative hedge accounting basis adjustment of senior notes and long-term debt as of December 31, 2022.

(3) Positive (negative) amounts related to AFS securities represent cumulative fair value hedge basis adjustments that will reduce (increase) net interest income in future periods. Positive (negative) amounts related to Senior Notes and Long-Term Subordinated Debt represent cumulative fair value hedge basis adjustments that will increase (reduce) net interest income in future periods.

(4) Carrying value represents amortized cost.

Net Investment Hedges. Certain foreign exchange contracts are designated as net investment hedges to minimize Northern Trust’s exposure to variability in the foreign currency translation of net investments in non-U.S. branches and subsidiaries. Net investment hedge losses of $77.4 million and net investment hedge gains of $278.7 million were recognized in AOCI related to foreign exchange contracts for the years ended December 31, 2023 and 2022, respectively.

Derivative Instruments Not Designated as Hedging under GAAP. Northern Trust’s derivative instruments that are not designated as hedging under GAAP include derivatives for purposes of client-related and trading activities, as well as other risk management purposes. These activities consist principally of providing foreign exchange services to clients in connection with Northern Trust’s global custody business. However, in the normal course of business, Northern Trust also engages in trading of currencies for its own account.

Non-designated risk management derivatives include foreign exchange contracts entered into to manage the foreign currency risk of non-U.S.-dollar-denominated assets and liabilities, the net investment in certain non-U.S. affiliates, commercial loans, and forecasted foreign-currency-denominated transactions. Swaps related to sales of certain Visa Class B common shares were entered into pursuant to which Northern Trust retains the risks associated with the ultimate conversion of the Visa Class B common shares into Visa Class A common shares. Total return swaps are entered into to manage the equity price risk associated with certain investments.

Changes in the fair value of derivative instruments not designated as hedges under GAAP are recognized currently in income. The following table provides the location and amount of gains and losses recorded on the consolidated statements of income for the years ended December 31, 2023, 2022, and 2021 for derivative instruments not designated as hedges under GAAP.

TABLE 119: LOCATION AND AMOUNT OF GAINS AND LOSSES RECORDED IN INCOME FOR DERIVATIVES NOT DESIGNATED AS HEDGING UNDER GAAP

(In Millions)	DERIVATIVE GAINS (LOSSES) LOCATION RECOGNIZED IN INCOME	AMOUNT OF DERIVATIVE GAINS (LOSSES) RECOGNIZED IN INCOME
		2023		2022		2021
Non-designated risk management derivatives
Foreign Exchange Contracts	Other Operating Income	$	1.8	$	(3.1)	$	1.2
Other Financial Derivatives(1)	Other Operating Income	(21.2)		(22.2)		(21.3)
Gains (Losses) from non-designated risk management derivatives		$	(19.4)	$	(25.3)	$	(20.1)
Client-related and trading derivatives
Foreign Exchange Contracts	Foreign Exchange Trading Income	$	203.9	$	288.6	$	292.6
Interest Rate Contracts	Security Commissions and Trading Income	8.9		9.6		15.7
Gains (Losses) from client-related and trading derivatives		$	212.8	$	298.2	$	308.3
Total gains (losses) from derivatives not designated as hedging under GAAP		$	193.4	$	272.9	$	288.2

(1) This line includes swaps related to the sale of certain Visa Class B common shares and total return swap contracts.

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 159

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Note 26 – Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repurchase

Securities purchased under agreements to resell and securities sold under agreements to repurchase are accounted for as collateralized financings and recorded at the amounts at which the securities were acquired or sold plus accrued interest. To minimize any potential credit risk associated with these transactions, the fair value of the securities purchased or sold is monitored, limits are set on exposure with counterparties, and the financial condition of counterparties is regularly assessed. It is Northern Trust’s policy to take possession, either directly or via third-party custodians, of securities purchased under agreements to resell. Securities sold under agreements to repurchase are either directly held by, or pledged to the counterparty until the repurchase. Northern Trust nets securities sold under repurchase agreements against those purchased under resale agreements when there is a legally enforceable master netting arrangement and the other conditions to net are met.

The following tables summarize information related to Securities Purchased under Agreements to Resell and Securities Sold under Agreements to Repurchase.

TABLE 120: SECURITIES PURCHASED UNDER AGREEMENTS TO RESELL

($ In Millions)	2023			2022
Balance at December 31	$	784.7		$	1,070.3
Average Balance During the Year	950.9			1,071.2
Average Interest Rate Earned During the Year	166.71		%	9.68		%
Maximum Month-End Balance During the Year	$	1,326.2		$	1,320.8

Note: The table above includes the impact of balance sheet netting of approximately $29.1 billion and $3.6 billion in 2023 and 2022, respectively.

TABLE 121: SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE

($ In Millions)	2023			2022
Balance at December 31	$	784.7		$	567.2
Average Balance During the Year	401.5			433.6
Average Interest Rate Paid During the Year	383.84		%	20.94		%
Maximum Month-End Balance During the Year	$	988.1		$	869.0

Note: The table above includes the impact of balance sheet netting of approximately $29.1 billion and $3.6 billion in 2023 and 2022, respectively.

TABLE 122: REPURCHASE AGREEMENTS ACCOUNTED FOR AS SECURED BORROWINGS

	REMAINING CONTRACTUAL MATURITY OF THE AGREEMENTS
	OVERNIGHT AND CONTINUOUS
(In Millions)	December 31, 2023		December 31, 2022
U.S. Treasury and Agency Securities	$	784.7	$	567.2
Total Borrowings	784.7		567.2
Net Amount of Recognized Liabilities for Repurchase Agreements in Note 27	784.7		567.2

160 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Note 27 – Offsetting of Assets and Liabilities

The following table provides information regarding the offsetting of derivative assets and of securities purchased under agreements to resell within the consolidated balance sheets as of December 31, 2023 and 2022.

TABLE 123: OFFSETTING OF DERIVATIVE ASSETS AND SECURITIES PURCHASED UNDER AGREEMENTS TO RESELL

	DECEMBER 31, 2023
(In Millions)	GROSS RECOGNIZED ASSETS		GROSS AMOUNTS OFFSET IN THE BALANCE SHEET(3)		NET AMOUNTS PRESENTED IN THE BALANCE SHEET		GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET(4)		NET AMOUNT(5)
Derivative Assets(1)
Foreign Exchange Contracts Over the Counter (OTC)	$	3,006.3	$	2,937.2	$	69.1	$	12.2	$	56.9
Interest Rate Swaps OTC	301.4		189.5		111.9		—		111.9
Interest Rate Swaps Exchange Cleared	0.1		—		0.1		—		0.1
Total Derivatives Subject to a Master Netting Arrangement	3,307.8		3,126.7		181.1		12.2		168.9
Total Derivatives Not Subject to a Master Netting Arrangement	260.4		—		260.4		—		260.4
Total Derivatives	3,568.2		3,126.7		441.5		12.2		429.3
Securities Purchased under Agreements to Resell(2)	$	62,860.2	$	62,075.5	$	784.7	$	—	$	784.7

	DECEMBER 31, 2022
(In Millions)	GROSS RECOGNIZED ASSETS		GROSS AMOUNTS OFFSET IN THE BALANCE SHEET(3)		NET AMOUNTS PRESENTED IN THE BALANCE SHEET		GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET(4)		NET AMOUNT(5)
Derivative Assets(1)
Foreign Exchange Contracts OTC	$	2,928.9	$	2,666.4	$	262.5	$	5.0	$	257.5
Interest Rate Swaps OTC	217.6		144.3		73.3		—		73.3
Interest Rate Swaps Exchange Cleared	4.4		—		4.4		—		4.4
Other Financial Derivatives	0.3		—		0.3		—		0.3
Total Derivatives Subject to a Master Netting Arrangement	3,151.2		2,810.7		340.5		5.0		335.5
Total Derivatives Not Subject to a Master Netting Arrangement	581.2		—		581.2		—		581.2
Total Derivatives	3,732.4		2,810.7		921.7		5.0		916.7
Securities Purchased under Agreements to Resell(2)	$	12,494.2	$	11,423.9	$	1,070.3	$	1,070.3	$	—

(1) Derivative assets are reported in Other Assets on the consolidated balance sheets. Other Assets (excluding derivative assets) totaled $10.3 billion and $8.9 billion as of December 31, 2023 and 2022, respectively.

(2) Offsetting of Securities Purchased under Agreements to Resell primarily relates to our involvement in the FICC.

(3) Including cash collateral received from counterparties.

(4) Including financial assets accepted as collateral which are received from counterparties.

(5) Northern Trust did not possess any cash collateral that was not offset on the consolidated balance sheets that could have been used to offset the net amounts presented on the consolidated balance sheets as of December 31, 2023 and 2022.

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 161

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

The following table provides information regarding the offsetting of derivative liabilities and of securities sold under agreements to repurchase within the consolidated balance sheets as of December 31, 2023 and 2022.

TABLE 124: OFFSETTING OF DERIVATIVE LIABILITIES AND SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE

	DECEMBER 31, 2023
(In Millions)	GROSS RECOGNIZED LIABILITIES		GROSS AMOUNTS OFFSET IN THE BALANCE SHEET(3)		NET AMOUNTS PRESENTED IN THE BALANCE SHEET		GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET(4)		NET AMOUNT(5)
Derivative Liabilities(1)
Foreign Exchange Contracts OTC	$	2,411.7	$	2,175.7	$	236.0	$	—	$	236.0
Interest Rate Swaps OTC	368.3		6.0		362.3		—		362.3
Interest Rate Swaps Exchange Cleared	0.9		—		0.9		—		0.9
Other Financial Derivatives	25.4		23.7		1.7		—		1.7
Total Derivatives Subject to a Master Netting Arrangement	2,806.3		2,205.4		600.9		—		600.9
Total Derivatives Not Subject to a Master Netting Arrangement	843.5		—		843.5		—		843.5
Total Derivatives	3,649.8		2,205.4		1,444.4		—		1,444.4
Securities Sold under Agreements to Repurchase(2)	$	62,860.2	$	62,075.5	$	784.7	$	784.7	$	—

	DECEMBER 31, 2022
(In Millions)	GROSS RECOGNIZED LIABILITIES		GROSS AMOUNTS OFFSET IN THE BALANCE SHEET(3)		NET AMOUNTS PRESENTED IN THE BALANCE SHEET		GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET(4)		NET AMOUNT(5)
Derivative Liabilities(1)
Foreign Exchange Contracts OTC	$	2,082.3	$	1,826.7	$	255.6	$	—	$	255.6
Interest Rate Swaps OTC	426.5		5.9		420.6		—		420.6
Interest Rate Swaps Exchange Cleared	5.3		—		5.3		—		5.3
Other Financial Derivatives	34.8		33.3		1.5		—		1.5
Total Derivatives Subject to a Master Netting Arrangement	2,548.9		1,865.9		683.0		—		683.0
Total Derivatives Not Subject to a Master Netting Arrangement	1,105.2		—		1,105.2		—		1,105.2
Total Derivatives	3,654.1		1,865.9		1,788.2		—		1,788.2
Securities Sold under Agreements to Repurchase(2)	$	11,991.1	$	11,423.9	$	567.2	$	567.2	$	—

(1) Derivative liabilities are reported in Other Liabilities on the consolidated balance sheets. Other Liabilities (excluding derivative liabilities) totaled $4.0 billion and $3.2 billion as of December 31, 2023 and 2022, respectively.

(2) Offsetting of Securities Sold under Agreements to Repurchase primarily relates to our involvement in the FICC.

(3) Including cash collateral deposited with counterparties.

(4) Including financial assets accepted as collateral which are deposited with counterparties.

(5) Northern Trust did not place any cash collateral with counterparties that was not offset on the consolidated balance sheets that could have been used to offset the net amounts presented on the consolidated balance sheets as of December 31, 2023 and 2022.

All of Northern Trust’s securities sold under agreements to repurchase (repurchase agreements) and securities purchased under agreements to resell (reverse repurchase agreements) involve the transfer of financial assets in exchange for cash subject to a right and obligation to repurchase those assets for an agreed upon amount. In the event of a repurchase failure, the cash or financial assets are available for offset. All of Northern Trust’s repurchase agreements and reverse repurchase agreements are subject to a master netting arrangement, which sets forth the rights and obligations for repurchase and offset. Under the master netting arrangement, Northern Trust is entitled to set off receivables from and collateral placed with a single counterparty against obligations owed to that counterparty. In addition, collateral held by Northern Trust can be offset against receivables from that counterparty. Northern Trust has elected to net securities sold under repurchase agreements against those purchased under resale agreements when the GAAP requirements to net are met.

Derivative asset and liability positions with a single counterparty can be offset against each other in cases where legally enforceable master netting arrangements or similar agreements exist. Derivative assets and liabilities can be further offset by cash collateral received from, and deposited with, the transacting counterparty. The basis for this view is that, upon termination of transactions subject to a master netting arrangement or similar agreement, the individual derivative receivables do not represent resources to which general creditors have rights and individual derivative payables do not represent claims that are equivalent to the claims of general creditors. Northern Trust has elected to net derivative assets

162 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

and liabilities when legally enforceable master netting arrangements or similar agreements exist between Northern Trust and the counterparty.

Credit risk associated with derivative instruments relates to the failure of the counterparty and the failure of Northern Trust to pay based on the contractual terms of the agreement, and is generally limited to the unrealized fair value gains and losses on these instruments, net of any collateral received or deposited. The amount of credit risk will increase or decrease during the lives of the instruments as interest rates, foreign exchange rates, or equity prices fluctuate. Northern Trust’s risk is controlled by limiting such activity to an approved list of counterparties and by subjecting such activity to the same credit and quality controls as are followed in lending and investment activities. Credit support annexes and other similar agreements are currently in place with a number of Northern Trust’s counterparties which mitigate the aforementioned credit risk associated with derivative activity conducted with those counterparties by requiring that significant net unrealized fair value gains be supported by collateral placed with Northern Trust.

Additional cash collateral received from and deposited with derivative counterparties totaling $373.1 million and $21.3 million, respectively, as of December 31, 2023, and $131.8 million and $26.3 million, respectively, as of December 31, 2022, was not offset against derivative assets and liabilities on the consolidated balance sheets as the amounts exceeded the net derivative positions with those counterparties.

Certain master netting arrangements Northern Trust enters into with derivative counterparties contain credit risk-related contingent features in which the counterparty has the option to declare Northern Trust in default and accelerate cash settlement of net derivative liabilities with the counterparty in the event Northern Trust’s credit rating falls below specified levels. The aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a liability position was $1.2 billion and $190.9 million at December 31, 2023 and 2022, respectively. Cash collateral amounts deposited with derivative counterparties on those dates included $1.1 billion and $55.1 million, respectively, posted against these liabilities, resulting in a net maximum amount of termination payments that could have been required at December 31, 2023 and 2022 of $52.2 million and $135.8 million, respectively. Accelerated settlement of these liabilities would not have a material effect on the consolidated financial position or liquidity of Northern Trust.

Note 28 – Variable Interest Entities

Northern Trust is involved with various entities in the normal course of business that are deemed to be variable interest entities (VIEs). VIEs are defined within GAAP as entities which either (1) lack sufficient equity at risk to permit the entity to finance its activities without additional subordinated financial support, (2) have equity investors that lack attributes typical of an equity investor, such as the ability to make significant decisions through voting rights affecting the entity’s operations, or the obligation to absorb expected losses or the right to receive residual returns of the entity, or (3) are structured with voting rights that are disproportionate to the equity investor’s obligation to absorb losses or right to receive returns, and substantially all of the activities are conducted on behalf of the holder of the equity investment at risk with disproportionately few voting rights. Investors that finance a VIE through debt or equity interests are variable interest holders in the entity and the variable interest holder, if any, that has both the power to direct the activities that most significantly impact the entity’s economic performance and, through its variable interest, the obligation to absorb losses or the right to receive returns that could potentially be significant to the entity is deemed to be the VIE’s primary beneficiary and is required to consolidate the VIE.

Tax credit structures. Northern Trust holds tax-advantaged investments in unconsolidated entities that own and operate affordable housing and other community development projects. These entities, which are limited partnerships and similar entities, are primarily VIEs and are designed to generate a return primarily through the realization of tax credits and other tax benefits, such as tax deductions from operating losses of the investments. Northern Trust invests as a limited partner/investor member and lacks both the power to direct the entities’ most significant activities and the obligation to absorb losses or right to receive benefits that could potentially be significant to the entities. Northern Trust is not required to consolidate these entities as it does not have a controlling financial interest and thus is not the primary beneficiary.

Northern Trust’s maximum exposure to loss as a result of its involvement with these entities is limited to the carrying amounts of its investments, including any undrawn commitments. Northern Trust’s funding requirements are limited to its invested capital and undrawn commitments for future equity contributions. Northern Trust has no exposure to loss from liquidity arrangements and no obligation to purchase assets of these entities.

Northern Trust’s investments in these unconsolidated entities and related unfunded commitments are reported in Other Assets and Other Liabilities, respectively, on the consolidated balance sheets.

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 163

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

TABLE 125: SUMMARY OF UNCONSOLIDATED TAX CREDIT STRUCTURES

(In Millions)	DECEMBER 31, 2023		DECEMBER 31, 2022
Investment Carrying Amount
Affordable Housing	$	622.8	$	635.9
Other Community Development	266.3		268.4
Total Investment Carrying Amount(1)	$	889.1	$	904.3
Unfunded Commitments
Affordable Housing	$	178.8	$	218.9
Other Community Development	—		—
Total Unfunded Commitments(2)	$	178.8	$	218.9

(1)    As of December 31, 2023 and December 31, 2022, $857.0 million and $867.2 million are VIEs, respectively.

(2) As of December 31, 2023 and December 31, 2022, $172.0 million and $210.1 million relate to undrawn commitments on VIEs, respectively.

Tax credits and other tax benefits attributable to unconsolidated tax credit structures totaled $113.9 million and $99.1 million, respectively, as of December 31, 2023 and 2022 and are reported in Provision for Income Taxes on the consolidated statements of income.

Investment funds. Northern Trust acts as asset manager for various funds in which clients of Northern Trust are investors. As an asset manager of funds, Northern Trust earns a competitively priced fee that is based on assets managed and varies with each fund’s investment objective. Based on its analysis, Northern Trust has determined that it is not the primary beneficiary of these VIEs under GAAP.

Some of the funds for which Northern Trust acts as asset manager comply or operate in accordance with requirements that are similar to those in Rule 2a-7 of the Investment Company Act of 1940 for registered money market funds and therefore the funds are exempt from the consolidation requirements in ASC 810-10. Northern Trust voluntarily waived $8.8 million and $64.2 million of money market fund fees for the years ended December 31, 2023, and December 31, 2022, respectively, related to certain competitive factors. Northern Trust does not have any contractual obligations to provide financial support to the funds. Any potential future support of the funds will be at the discretion of Northern Trust after an evaluation of the specific facts and circumstances.

Periodically, Northern Trust makes seed capital investments to certain funds. As of December 31, 2023, Northern Trust had no seed capital investments and no unfunded commitments related to seed capital investments. As of December 31, 2022, Northern Trust had $19.9 million of such investments valued using net asset value per share and included in Other Assets and had no unfunded commitments related to seed capital investments.

Note 29 – Pledged Assets, Accepted Collateral and Restricted Assets

Pledged Assets. For our liquidity management strategy, we may pledge loans and/or securities to various financial market utilities to allow for client payment, clearing and settlement processing as part of our custody services. We may pledge loans or securities to Central Banks, Federal Home Loan Bank (FHLB) of Chicago and third parties for various purposes, for example: securing public and trust deposits, repurchase agreements, borrowings and derivative contracts.

For the year ended December 31, 2023 and 2022, respectively, $1.1 billion and $453.9 million of collateral we pledge, related to loans and/or securities, is eligible to be repledged or sold by the secured party. The following table presents the carrying value of Northern Trust’s pledged assets by type.

TABLE 126: TYPE OF PLEDGED ASSETS

	FOR THE YEAR ENDED DECEMBER 31,
(In Billions)	2023		2022
Debt Securities(1)	$	33.0	$	31.4
Loans(2)	10.3		11.8
Total Pledged Assets	$	43.3	$	43.2

(1) Debt securities are comprised of held to maturity and available for sale securities.

(2) Loans pledged at the FHLB of Chicago and the Federal Reserve Bank of Chicago.

164 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Accepted Collateral. Northern Trust accepts financial assets as collateral that it may, in some instances, be permitted to repledge or sell. The collateral is generally obtained under certain reverse repurchase agreements and derivative contracts. The following table presents the fair value of securities accepted as collateral.

TABLE 127: ACCEPTED COLLATERAL

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022
Collateral that may be repledged or sold
Reverse repurchase agreements(1)	$	62,767.8	$	12,119.4
Derivative contracts	12.2		5.0
Collateral that may not be repledged or sold
Reverse repurchase agreements	—		450.0
Total Collateral Accepted	$	62,780.0	$	12,574.4

(1) The fair value of securities collateral that was repledged or sold totaled $62.0 billion and $11.5 billion at December 31, 2023 and 2022, respectively. This primarily includes collateral accepted as related to the sponsored member program. Refer to Note 24, “Commitments and Contingent Liabilities” and Note 27, “Offsetting of Assets and Liabilities” for further information.

Restricted Assets. Certain cash may be restricted in terms of usage or withdrawal. As a result of the continuing military conflict involving Ukraine and the Russian Federation and related sanctions and legal restrictions in place, cash balances denominated in Russian rubles received for the benefit of certain clients in our Asset Servicing business are subject to distribution restrictions. As of December 31, 2023 and 2022, these balances totaled $722.2 million and $330.4 million, respectively, and are reported in Cash and Due from Banks on the consolidated balance sheet.

At December 31, 2023 and 2022, Northern Trust held cash of $575.2 million and $574.2 million, respectively, to meet non-U.S. reserve requirements. As a result of the economic environment arising from the COVID-19 pandemic, the Federal Reserve reduced the U.S. reserve requirement to zero percent on March 26, 2020. There were no average deposits required to meet Federal Reserve Bank reserve requirements at December 31, 2023 and 2022.

Note 30 – Restrictions on Subsidiary Dividends and Loans or Advances

Various federal and state statutory provisions limit the amount of dividends the Bank can pay to the Corporation without regulatory approval. Approval of the Federal Reserve Board is required for payment of any dividend by a state-chartered bank that is a member of the Federal Reserve System if the total of all dividends declared by the bank in any calendar year would exceed the total of its retained net income (as defined by regulatory agencies) for that year combined with its retained net income for the preceding two years. In addition, a state member bank may not pay a dividend in an amount greater than its “undivided profits,” as defined, without regulatory and stockholder approval.

Under Illinois law, an Illinois state bank, prior to paying a dividend, must carry over to surplus at least one-tenth of its net profits since the date of the declaration of the last preceding dividend, until the bank’s surplus is equal to its capital. In addition, an Illinois state bank may not pay any dividend in an amount greater than its net profits then on hand, after deduction of losses and bad debts (defined as debts due to a state bank on which interest is past due and unpaid for a period of six months or more, unless the same are well secured and in the process of collection).

The Bank is also prohibited under federal law from paying any dividends if the Bank is undercapitalized or if the payment of the dividends would cause the Bank to become undercapitalized. In addition, the federal regulatory agencies are authorized to prohibit a bank or bank holding company from engaging in an unsafe or unsound banking practice. The payment of dividends could, depending on the financial condition of the Bank, be deemed to constitute an unsafe or unsound practice. The Dodd-Frank Act and Basel III impose additional restrictions on the ability of banking institutions to pay dividends (e.g., the Corporation may pay dividends only in accordance with the capital plan rules and capital adequacy standards of the Federal Reserve). Our Bank subsidiary could have declared additional dividends of approximately $1.5 billion at December 31, 2023, without obtaining prior regulatory approval.

Under federal law, financial transactions by the Bank, the Corporation’s insured banking subsidiary, with the Corporation and its affiliates that are in the form of loans or extensions of credit, investments, guarantees, derivative transactions, repurchase agreements, securities lending transactions or purchases of assets, are restricted. These transactions must be on terms and conditions that are, or in good faith would be, offered to non-affiliated companies (i.e. on terms not less favorable to the Bank than market terms). Further, extensions of credit must be secured fully with qualifying collateral and are limited to 10% of the Bank’s capital and surplus for transactions with a single affiliate and to 20% of the Bank’s capital and surplus with all affiliates. Other state and federal laws may limit the transfer of funds by the Corporation’s banking subsidiaries to the Corporation and certain of its affiliates.

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 165

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Note 31 – Reporting Segments and Related Information

Segment Information. Northern Trust is organized around its two client-focused reporting segments: Asset Servicing and Wealth Management. Asset management and related services are provided to Asset Servicing and Wealth Management clients primarily by the Asset Management business. The revenue and expenses of Asset Management and certain other support functions are allocated fully to Asset Servicing and Wealth Management.

Reporting segment financial information, presented on an internal management-reporting basis, is determined by accounting systems used to allocate revenue and expense to each segment, and incorporates processes for allocating assets, liabilities, equity and the applicable interest income and expense utilizing a funds transfer pricing (FTP) methodology. Under the methodology, assets and liabilities receive a funding charge or credit that considers interest rate risk, liquidity risk, and other product characteristics on an instrument level. Additionally, segment information is presented on a fully taxable equivalent (FTE) basis as management believes an FTE presentation provides a clearer indication of net interest income. The adjustment to an FTE basis has no impact on Net Income.

Equity is allocated to the reporting segments based on a variety of factors including, but not limited to, risk, regulatory considerations, and internal metrics. Allocations of capital and certain corporate expense may not be representative of levels that would be required if the segments were independent entities. The accounting policies used for management reporting are consistent with those described in Note 1, “Summary of Significant Accounting Policies.” Transfers of income and expense items are recorded at cost; there is no consolidated profit or loss on sales or transfers between reporting segments. Northern Trust’s presentations are not necessarily consistent with similar information for other financial institutions.

Revenues, expenses and average assets are allocated to Asset Servicing and Wealth Management, with the exception of non-recurring activities such as certain corporate transactions and costs incurred associated with acquisitions, divestitures, litigation, restructuring, and tax adjustments not directly attributable to a specific reporting segment, which are reported within the Other segment.

Reporting segment results are subject to reclassification when organizational changes are made. The results are also subject to refinements in revenue and expense allocation methodologies, which are typically reflected on a prospective basis.

Asset Servicing. Asset Servicing is a leading global provider of asset servicing and related services to corporate and public retirement funds, foundations, endowments, fund managers, insurance companies, sovereign wealth funds, and other institutional investors around the globe. Asset servicing and related services encompass a full range of capabilities including but not limited to: custody; fund administration; investment operations outsourcing; investment management; investment risk and analytical services; employee benefit services; securities lending; foreign exchange; treasury management; brokerage services; transition management services; banking; and cash management. Client relationships are managed through the Bank and the Bank’s and the Corporation’s other subsidiaries, including support from locations in North America, Europe, the Middle East, and the Asia-Pacific region.

Wealth Management. Wealth Management focuses on high-net-worth individuals and families, business owners, executives, professionals, retirees, and established privately-held businesses in its target markets. In supporting these targeted segments, Wealth Management provides trust, investment management, custody, and philanthropic services; financial consulting; guardianship and estate administration; family business consulting; family financial education; brokerage services; and private and business banking. Wealth Management also includes Global Family Office, which provides customized services, including but not limited to: investment consulting; global custody; fiduciary; and private banking; family office consulting, and technology solutions, to meet the complex financial and reporting needs of ultra-high-net-worth individuals and family offices across the globe. Wealth Management services are delivered by multidisciplinary teams through a network of offices in 19 U.S. states and Washington, D.C., as well as offices in London, Guernsey, and Abu Dhabi.

Other. Income and expenses associated with non-recurring activities such as certain costs associated with acquisitions, divestitures, litigation, restructuring, and tax adjustments are included within Other.

The following tables reflect the earnings contribution and average assets of Northern Trust’s reporting segments for the years ended December 31, 2023, 2022, and 2021. Segment results are stated on an FTE basis which has no impact on net income. Financial measures stated on an FTE basis includes FTE adjustments of $57.5 million, $45.6 million, and $35.6 million for 2023, 2022, and 2021, respectively.

166 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

TABLE 128: ASSET SERVICING RESULTS OF OPERATIONS

	FOR THE YEAR ENDED DECEMBER 31,
($ In Millions)	2023			2022			2021
Noninterest Income
Trust, Investment and Other Servicing Fees	$	2,461.9		$	2,496.3		$	2,487.3
Foreign Exchange Trading Income	213.0			281.0			279.0
Other Noninterest Income	263.4			250.7			261.2
Total Noninterest Income	2,938.3			3,028.0			3,027.5
Net Interest Income(1)	1,197.3			1,072.7			637.2
Revenue(1)	4,135.6			4,100.7			3,664.7
Provision for (Release of) Credit Losses	0.5			2.4			(33.8)
Noninterest Expense	3,273.2			3,092.7			2,863.0
Income before Income Taxes(1)	861.9			1,005.6			835.5
Provision for Income Taxes(1)	187.1			243.2			194.1
Net Income	$	674.8		$	762.4		$	641.4
Percentage of Consolidated Net Income	61		%	57		%	41		%
Average Assets	$	101,472.6		$	115,646.4		$	120,883.2

(1) Financial measures stated on an FTE basis.

TABLE 129: WEALTH MANAGEMENT RESULTS OF OPERATIONS

	FOR THE YEAR ENDED DECEMBER 31,
($ In Millions)	2023			2022			2021
Noninterest Income
Trust, Investment and Other Servicing Fees	$	1,899.9		$	1,936.3		$	1,873.8
Foreign Exchange Trading Income (Loss)	(9.1)			7.6			13.6
Other Noninterest Income	150.8			137.7			188.2
Total Noninterest Income	2,041.6			2,081.6			2,075.6
Net Interest Income(1)	842.2			860.1			781.1
Revenue(1)	2,883.8			2,941.7			2,856.7
Provision for (Release of) Credit Losses	24.0			9.6			(47.7)
Noninterest Expense	1,882.3			1,815.5			1,651.1
Income before Income Taxes(1)	977.5			1,116.6			1,253.3
Provision for Income Taxes(1)	245.9			310.0			317.0
Net Income	$	731.6		$	806.6		$	936.3
Percentage of Consolidated Net Income	66		%	60		%	61		%
Average Assets	$	41,176.6		$	36,905.5		$	35,480.0

(1) Financial measures stated on an FTE basis.

TABLE 130: OTHER RESULTS OF OPERATIONS

	FOR THE YEAR ENDED DECEMBER 31,
($ In Millions)	2023			2022			2021
Noninterest Income (Loss)	$	(188.4)		$	(235.6)		$	(21.3)
Net Interest Income(1)	—			—			—
Revenue(1)	(188.4)			(235.6)			(21.3)
Noninterest Expense	128.7			74.7			21.8
Income (Loss) before Income Taxes(1)	(317.1)			(310.3)			(43.1)
Provision (Benefit) for Income Taxes(1)	(18.0)			(77.3)			(10.7)
Net Income (Loss)	$	(299.1)		$	(233.0)		$	(32.4)
Percentage of Consolidated Net Income (Loss)	(27)		%	(17)		%	(2)		%
Average Assets	$	—		$	—		$	—

(1) Financial measures stated on an FTE basis.

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 167

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

TABLE 131: CONSOLIDATED FINANCIAL INFORMATION

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Noninterest Income
Trust, Investment and Other Servicing Fees	$	4,361.8	$	4,432.6	$	4,361.1
Foreign Exchange Trading Income	203.9		288.6		292.6
Other Noninterest Income	225.8		152.8		428.1
Total Noninterest Income	4,791.5		4,874.0		5,081.8
Net Interest Income	1,982.0		1,887.2		1,382.7
Revenue	6,773.5		6,761.2		6,464.5
Provision for (Release of) Credit Losses	24.5		12.0		(81.5)
Noninterest Expense	5,284.2		4,982.9		4,535.9
Income before Income Taxes	1,464.8		1,766.3		2,010.1
Provision for Income Taxes	357.5		430.3		464.8
Net Income	$	1,107.3	$	1,336.0	$	1,545.3
Average Assets	$	142,649.2	$	152,551.9	$	156,363.2

Geographic Area Information. Northern Trust’s non-U.S. activities are primarily related to its asset servicing, asset management, foreign exchange, cash management, and commercial banking businesses. The operations of Northern Trust are managed on a reporting segment basis and include components of both U.S and non-U.S. source income and assets. Non-U.S. source income and assets are not separately identified in Northern Trust’s internal management reporting system. However, Northern Trust is required to disclose non-U.S. activities based on the domicile of the customer. Due to the complex and integrated nature of Northern Trust’s activities, it is difficult to segregate with precision revenues, expenses and assets between U.S. and non-U.S.-domiciled customers. Therefore, certain subjective estimates and assumptions have been made to allocate revenues, expenses and assets between U.S. and non-U.S. operations.

For purposes of this disclosure, all foreign exchange trading income has been allocated to non-U.S. operations. Interest expense is allocated to non-U.S. operations based on specifically matched or pooled funding. Allocations of indirect noninterest expenses, when made, are based on various methods such as time, space, and number of employees.

The following table summarizes Northern Trust’s performance based on the allocation process described above without regard to guarantors or the location of collateral.

TABLE 132: DISTRIBUTION OF TOTAL ASSETS AND OPERATING PERFORMANCE

($ In Millions)	TOTAL ASSETS		% OF TOTAL		TOTAL REVENUE(1)		% OF TOTAL		INCOME BEFORE INCOME TAXES		% OF TOTAL		NET INCOME		% OF TOTAL
2023
Non-U.S.	$	39,661.5	26	%	$	2,156.1	32	%	$	473.7	32	%	$	354.0	32	%
U.S.	111,121.6		74	%	4,617.4		68	%	991.1		68	%	753.3		68	%
Total	$	150,783.1	100	%	$	6,773.5	100	%	$	1,464.8	100	%	$	1,107.3	100	%
2022
Non-U.S.	$	35,991.3	23	%	$	2,273.3	34	%	$	560.9	32	%	$	420.2	31	%
U.S.	119,045.4		77	%	4,487.9		66	%	1,205.4		68	%	915.8		69	%
Total	$	155,036.7	100	%	$	6,761.2	100	%	$	1,766.3	100	%	$	1,336.0	100	%
2021
Non-U.S.	$	38,555.3	21	%	$	2,017.5	31	%	$	569.4	28	%	$	426.7	28	%
U.S.	145,334.5		79	%	4,447.0		69	%	1,440.7		72	%	1,118.6		72	%
Total	$	183,889.8	100	%	$	6,464.5	100	%	$	2,010.1	100	%	$	1,545.3	100	%

(1) Total revenue is comprised of net interest income and noninterest income.

Note 32 – Regulatory Capital Requirements

The Corporation and the Bank are subject to various regulatory capital requirements administered by the federal bank regulatory authorities. Under these requirements, banks must maintain specific risk-based capital and leverage ratios in order to be classified as “well-capitalized.” The regulatory capital requirements impose certain restrictions upon banks that meet minimum capital requirements but are not “well-capitalized” and obligate the federal bank regulatory authorities to take “prompt corrective action” with respect to banks that do not maintain such minimum ratios. Such prompt corrective action could have a direct material effect on a bank’s financial statements.

168 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

As of December 31, 2023 and 2022, the Bank had capital ratios above the levels required for classification as a “well-capitalized” institution and had not received any regulatory notification of a lower classification. The results of the 2023 DFAST, published by the Federal Reserve Board on June 28, 2023, resulted in Northern Trust’s stress capital buffer and effective Common Equity Tier 1 capital ratio minimum requirement remaining constant at 2.5% and 7.0%, respectively, for the annual capital plan cycle, which began on October 1, 2023 and continues through September 30, 2024.

Additionally, Northern Trust’s subsidiary banks located outside the U.S. are subject to regulatory capital requirements in the jurisdictions in which they operate. As of December 31, 2023 and 2022, Northern Trust’s non-U.S. banking subsidiaries had capital ratios above their specified minimum requirements. There were no conditions or events since December 31, 2023, that management believes have adversely affected the capital categorization of any Northern Trust subsidiary bank. The following table provides capital ratios for the Corporation and the Bank determined by Basel III phased in requirements.

TABLE 133: RISK-BASED AND LEVERAGE CAPITAL AMOUNTS AND RATIOS

	DECEMBER 31, 2023								DECEMBER 31, 2022
($ In Millions)	STANDARDIZED APPROACH				ADVANCED APPROACH				STANDARDIZED APPROACH				ADVANCED APPROACH
	BALANCE		RATIO		BALANCE		RATIO		BALANCE		RATIO		BALANCE		RATIO
Common Equity Tier 1 Capital
Northern Trust Corporation	$	10,179.4	11.4	%	$	10,179.4	13.4	%	$	9,539.7	10.8	%	$	9,539.7	11.5	%
The Northern Trust Company	10,806.2		12.2		10,806.2		14.6		10,111.2		11.6		10,111.2		12.4
Minimum to qualify as well-capitalized:
Northern Trust Corporation	N/A		N/A		N/A		N/A		N/A		N/A		N/A		N/A
The Northern Trust Company	5,768.4		6.5		4,808.6		6.5		5,684.4		6.5		5,286.2		6.5
Tier 1 Capital
Northern Trust Corporation	11,023.9		12.3		11,023.9		14.5		10,397.4		11.8		10,397.4		12.5
The Northern Trust Company	10,806.2		12.2		10,806.2		14.6		10,111.2		11.6		10,111.2		12.4
Minimum to qualify as well-capitalized:
Northern Trust Corporation	5,371.6		6.0		4,558.8		6.0		5,286.5		6.0		4,990.9		6.0
The Northern Trust Company	7,099.5		8.0		5,918.3		8.0		6,996.2		8.0		6,506.1		8.0
Total Capital
Northern Trust Corporation	12,733.9		14.2		12,514.7		16.5		12,245.5		13.9		12,045.9		14.5
The Northern Trust Company	12,279.3		13.8		12,060.2		16.3		11,766.8		13.5		11,567.2		14.2
Minimum to qualify as well-capitalized:
Northern Trust Corporation	8,952.7		10.0		7,598.0		10.0		8,810.8		10.0		8,318.1		10.0
The Northern Trust Company	8,874.4		10.0		7,397.9		10.0		8,745.3		10.0		8,132.6		10.0
Tier 1 Leverage
Northern Trust Corporation	11,023.9		8.1		11,023.9		8.1		10,397.4		7.1		10,397.4		7.1
The Northern Trust Company	10,806.2		8.0		10,806.2		8.0		10,111.2		6.9		10,111.2		6.9
Minimum to qualify as well-capitalized:
Northern Trust Corporation	N/A		N/A		N/A		N/A		N/A		N/A		N/A		N/A
The Northern Trust Company	6,764.0		5.0		6,764.0		5.0		7,323.8		5.0		7,323.8		5.0
Supplementary Leverage(1)
Northern Trust Corporation	N/A		N/A		11,023.9		8.6		N/A		N/A		10,397.4		7.9
The Northern Trust Company	N/A		N/A		10,806.2		8.5		N/A		N/A		10,111.2		7.7
Minimum to qualify as well-capitalized:
Northern Trust Corporation	N/A		N/A		N/A		N/A		N/A		N/A		N/A		N/A
The Northern Trust Company	N/A		N/A		3,825.6		3.0		N/A		N/A		3,931.5		3.0

(1) In November 2019, the Federal Reserve Board and other U.S. federal banking agencies adopted a final rule that established a deduction for central bank deposits from the total leverage exposures of custodial banking organizations, including the Corporation and the Bank, equal to the lesser of (i) the total amount of funds the custodial banking organization and its consolidated subsidiaries have on deposit at qualifying central banks and (ii) the total amount of client funds on deposit at the custodial banking organization that are linked to fiduciary or custodial and safekeeping accounts. The rule became effective on April 1, 2020.

The supplementary leverage ratios at December 31, 2023 and December 31, 2022 for the Corporation and the Bank reflect the impact of the final rule.    

Under the final Basel III rules, the Corporation and the Bank are required to calculate and publicly disclose risk-based capital ratios using two methodologies: an advanced approach and a standardized approach. Under the advanced approach, credit RWA are based on internal credit models and parameters. Additionally, the advanced approach incorporates operational risk RWA. Under the standardized approach, RWA are based on supervisory prescribed risk weights that are primarily dependent on counterparty type and asset class.

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 169

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Pursuant to the Federal Reserve Board's implementation in the final Basel III rules of a provision of the Dodd-Frank Act, the capital adequacy of the Corporation and the Bank is assessed based on the lower of the advanced approach or standardized approach capital ratios.

Note 33 – Northern Trust Corporation (Corporation only)

Condensed financial information is presented in the following tables. Investments in wholly-owned subsidiaries are carried on the equity method of accounting.

TABLE 134: CONDENSED BALANCE SHEETS

	DECEMBER 31,
(In Millions)	2023		2022
ASSETS
Cash on Deposit with Subsidiary Bank	$	795.5	$	601.4
Advances to Wholly-Owned Subsidiaries – Banks	3,760.0		4,010.0
Investments in Wholly-Owned Subsidiaries – Banks	11,591.4		10,897.1
– Nonbank	209.7		194.7
Other Assets	1,233.1		1,226.3
Total Assets	$	17,589.7	$	16,929.5
LIABILITIES
Senior Notes	$	2,773.2	$	2,724.2
Long-Term Debt	2,065.0		2,066.2
Other Liabilities	853.6		879.6
Total Liabilities	5,691.8		5,670.0
STOCKHOLDERS’ EQUITY
Preferred Stock	884.9		884.9
Common Stock	408.6		408.6
Additional Paid-in Capital	1,009.6		983.5
Retained Earnings	14,233.8		13,798.5
Accumulated Other Comprehensive Income (Loss)	(1,137.9)		(1,569.2)
Treasury Stock	(3,501.1)		(3,246.8)
Total Stockholders’ Equity	11,897.9		11,259.5
Total Liabilities and Stockholders’ Equity	$	17,589.7	$	16,929.5

TABLE 135: CONDENSED STATEMENTS OF INCOME

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
OPERATING INCOME
Dividends – Bank Subsidiaries	$	850.0	$	—	$	751.1
– Nonbank Subsidiaries	—		—		8.3
Intercompany Interest and Other Charges	260.2		112.8		20.1
Interest and Other Income	12.2		(5.7)		32.3
Total Operating Income	1,122.4		107.1		811.8
OPERATING EXPENSES
Interest Expense	279.5		132.3		71.3
Other Operating Expenses	32.3		11.9		36.7
Total Operating Expenses	311.8		144.2		108.0
Income (Loss) before Income Taxes and Equity in Undistributed Net Income of Subsidiaries	810.6		(37.1)		703.8
Benefit for Income Taxes	12.4		16.9		25.7
Income (Loss) before Equity in Undistributed Net Income of Subsidiaries	823.0		(20.2)		729.5
Equity in Undistributed Net Income of Subsidiaries – Banks	269.4		1,338.5		803.3
– Nonbank	14.9		17.7		12.5
Net Income	$	1,107.3	$	1,336.0	$	1,545.3
Preferred Stock Dividends	41.8		41.8		41.8
Net Income Applicable to Common Stock	$	1,065.5	$	1,294.2	$	1,503.5

170 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

TABLE 136: CONDENSED STATEMENTS OF CASH FLOWS

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	$	1,107.3	$	1,336.0	$	1,545.3
Adjustments to Reconcile Net Income to Net Cash Provided by (Used in) Operating Activities
Equity in Undistributed Net Income of Subsidiaries	(284.3)		(1,356.2)		(815.8)
Change in Prepaid Expenses	1.7		(3.8)		0.1
Change in Accrued Income Taxes	(10.2)		36.6		2.2
Other Operating Activities, net	138.1		(608.2)		236.6
Net Cash Provided by (Used in) Operating Activities	952.6		(595.6)		968.4
CASH FLOWS FROM INVESTING ACTIVITIES
Investments in and Advances to Subsidiaries, net	250.0		(1,200.1)		(140.0)
Other Investing Activities, net	—		(0.1)		5.1
Net Cash Provided by (Used in) Investing Activities	250.0		(1,200.2)		(134.9)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from Senior Notes	—		1,988.8		—
Repayments of Senior Notes	—		(500.0)		(500.0)
Repayment of Floating Rate Capital Debt	—		—		(278.8)
Treasury Stock Purchased	(347.5)		(35.4)		(267.6)
Net Proceeds from Stock Options	2.3		3.9		53.8
Cash Dividends Paid on Common Stock	(621.5)		(750.2)		(583.3)
Cash Dividends Paid on Preferred Stock	(41.8)		(46.5)		(41.8)
Other Financing Activities, net	—		4.9		(0.1)
Net Cash (Used in) Provided by Financing Activities	(1,008.5)		665.5		(1,617.8)
Net Change in Cash on Deposit with Subsidiary Bank	194.1		(1,130.3)		(784.3)
Cash on Deposit with Subsidiary Bank at Beginning of Year	601.4		1,731.7		2,516.0
Cash on Deposit with Subsidiary Bank at End of Year	$	795.5	$	601.4	$	1,731.7

Note 34 – Subsequent Events

In January 2024, the Corporation sold certain available-for-sale debt securities with an amortized cost of $2.2 billion that were in an unrealized loss position in conjunction with a repositioning of the portfolio. As a result, the Corporation recognized a $189.4 million loss recorded in Investment Security Gains (Losses), net on the consolidated statements of income in the first quarter of 2024. The $189.4 million realized loss includes $18.4 million of cumulative hedge accounting basis adjustments related to discontinued fair value hedging relationships of certain available-for-sale debt securities sold.

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 171

ITEM 9 – CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

None.

ITEM 9A – CONTROLS AND PROCEDURES

Disclosure Controls and Procedures

As of December 31, 2023, the Corporation’s management, with the participation of the Corporation’s Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of the Corporation’s disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act) that are designed to ensure that information required to be disclosed by the Corporation in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms. Based on such evaluation, such officers have concluded that, as of December 31, 2023, the Corporation’s disclosure controls and procedures are effective.

Management’s Report on Internal Control Over Financial Reporting

Management of the Corporation is responsible for establishing and maintaining adequate internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) to provide reasonable assurance to the Corporation’s management and Board of Directors regarding the preparation of reliable published financial statements. This internal control includes monitoring mechanisms, and actions are taken to correct deficiencies identified.

Management assessed the Corporation’s internal control over financial reporting as of December 31, 2023, based on the criteria for effective internal control over financial reporting described in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this assessment, management concluded that, as of December 31, 2023, the Corporation maintained effective internal control over financial reporting. Additionally, KPMG LLP, the independent registered public accounting firm that audited the Corporation’s consolidated financial statements as of, and for the year ended, December 31, 2023, included in this Annual Report on Form 10-K, has issued an attestation report on the effectiveness of the Corporation’s internal control over financial reporting as of December 31, 2023.

Changes in Internal Control Over Financial Reporting

There have been no changes in the Corporation’s internal control over financial reporting identified in connection with the evaluation required by Rules 13a-15 and 15d-15 under the Exchange Act during the last fiscal quarter that have materially affected, or are reasonably likely to materially affect, the Corporation’s internal control over financial reporting.

172 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

Report of Independent Registered Public Accounting Firm

To the Stockholders and Board of Directors

Northern Trust Corporation:

Opinion on Internal Control Over Financial Reporting

We have audited Northern Trust Corporation and subsidiaries’ (the Corporation) internal control over financial reporting as of December 31, 2023, based on criteria established in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. In our opinion, the Corporation maintained, in all material respects, effective internal control over financial reporting as of December 31, 2023, based on criteria established in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheets of the Corporation as of December 31, 2023 and 2022, the related consolidated statements of income, comprehensive income, changes in stockholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2023, and the related notes (collectively, the consolidated financial statements), and our report dated February 27, 2024 expressed an unqualified opinion on those consolidated financial statements.

Basis for Opinion

The Corporation’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the Corporation’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Corporation in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audit also included performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control Over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Chicago, Illinois

February 27, 2024

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 173

ITEM 9B – OTHER INFORMATION

During the three months ended December 31, 2023, none of our directors or officers (as defined in Rule 16a-1(f) promulgated under the Securities Exchange Act of 1934, as amended) adopted, terminated or modified a Rule 10b5-1 trading arrangement or a non-Rule 10b5-1 trading arrangement (as such terms are defined in Item 408 of Regulation S-K).

ITEM 9C – DISCLOSURE REGARDING FOREIGN JURISDICTIONS THAT PREVENT INSPECTIONS

Not applicable.

PART III

ITEM 10 – DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

The information called for by this item is incorporated by reference to “Supplemental Item – Information About Our Executive Officers” in Part I of this Annual Report on Form 10-K, as well as the following sections of the Corporation’s definitive Proxy Statement for the 2024 Annual Meeting of Stockholders: “Item 1 – Election of Directors,” “Information about the Nominees for Director,” “Security Ownership by Directors and Executive Officers,” “Corporate Governance – Code of Business Conduct and Ethics,” “Corporate Governance – Director Nominations and Qualifications and Proxy Access,” “Board and Board Committee Information – Audit Committee” and “Board and Board Committee Information – Board Committees.”

ITEM 11 – EXECUTIVE COMPENSATION

The information called for by this item is incorporated herein by reference to the “Compensation Discussion and Analysis,” “Human Capital and Compensation Committee Report,” “Executive Compensation,” and “Director Compensation” sections of the Corporation’s definitive Proxy Statement for the 2024 Annual Meeting of Stockholders.

ITEM 12 – SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

The information called for by this item is incorporated herein by reference to the “Security Ownership by Directors and Executive Officers,” “Security Ownership of Certain Beneficial Owners,” and “Equity Compensation Plan Information” sections of the Corporation’s definitive Proxy Statement for the 2024 Annual Meeting of Stockholders.

ITEM 13 – CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

The information called for by this item is incorporated herein by reference to the “Board and Board Committee Information,” “Corporate Governance – Director Independence” and the “Corporate Governance – Related Person Transactions Policy” sections of the Corporation’s definitive Proxy Statement for the 2024 Annual Meeting of Stockholders.

ITEM 14 – PRINCIPAL ACCOUNTANT FEES AND SERVICES

The information called for by this item is incorporated herein by reference to the “Audit Matters” section of the Corporation’s definitive Proxy Statement for the 2024 Annual Meeting of Stockholders.

174 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

PART IV

ITEM 15 – EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

ITEM 15(a)(1) AND (2) – NORTHERN TRUST CORPORATION AND SUBSIDIARIES LIST OF FINANCIAL STATEMENTS AND FINANCIAL STATEMENT SCHEDULES

The following financial statements of the Corporation and its Subsidiaries included in Item 8, “Financial Statements and Supplementary Data,” of this Annual Report on Form 10-K are incorporated herein by reference.

For Northern Trust Corporation and Subsidiaries:

Consolidated Balance Sheets - December 31, 2023 and 2022

Consolidated Statements of Income - Years Ended December 31, 2023, 2022, and 2021

Consolidated Statements of Comprehensive Income - Years Ended December 31, 2023, 2022, and 2021

Consolidated Statements of Changes in Stockholders’ Equity - Years Ended December 31, 2023, 2022, and 2021

Consolidated Statements of Cash Flows - Years Ended December 31, 2023, 2022, and 2021

Notes to Consolidated Financial Statements

Report of Independent Registered Public Accounting Firm (KPMG LLP, Chicago, IL, Auditor Firm ID: 185)

Financial statement schedules have been omitted for the reason that they are not required or are not applicable.

ITEM 15(a)(3) – EXHIBITS

Exhibit Number	Description
3.1	Restated Certificate of Incorporation of Northern Trust Corporation, as amended to date (incorporated herein by reference to Exhibit 3.1 to the Corporation’s Current Report on Form 8-K filed April 19, 2006).
3.2	Certificate of Designation of Series D Non-Cumulative Perpetual Preferred Stock of Northern Trust Corporation, dated August 4, 2016 (incorporated herein by reference to Exhibit 3.1 to the Corporation’s Current Report on Form 8-K filed August 8, 2016).
3.3	Certificate of Designation of Series E Non-Cumulative Perpetual Preferred Stock of Northern Trust Corporation, dated October 31, 2019 (incorporated herein by reference to Exhibit 3.1 to the Corporation’s Current Report on Form 8-K filed November 5, 2019).
3.4	By-laws of Northern Trust Corporation, as amended November 15, 2022 (incorporated herein by reference to Exhibit 3.1 to the Corporation’s Current Report on Form 8-K filed November 18, 2022).
4.1	Deposit Agreement, dated August 8, 2016, among Northern Trust Corporation, Wells Fargo Bank, N.A., as depositary (which, effective February 1, 2018, was succeeded by Equiniti Trust Company), and the holders from time to time of the depositary receipts described therein (incorporated by reference to Exhibit 4.2 to the Corporation’s Current Report on Form 8-K filed August 8, 2016).
4.2	Deposit Agreement, dated November 5, 2019, among Northern Trust Corporation, Equiniti Trust Company, as depositary, and the holders from time to time of the depositary receipts described therein (incorporated by reference to Exhibit 4.2 to the Corporation’s Current Report on Form 8-K filed November 5, 2019).
4.3	Description of securities registered pursuant to Section 12 of the Securities Exchange Act of 1934.
4.4	Certain instruments defining the rights of the holders of long-term debt of the Corporation and certain of its subsidiaries, none of which authorize a total amount of indebtedness in excess of 10% of the total assets of the Corporation and its subsidiaries on a consolidated basis, have not been filed as exhibits. The Corporation hereby agrees to furnish a copy of any of these agreements to the SEC upon request.

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 175

Exhibit Number	Description
10.1**	Deferred Compensation Plans Trust Agreement, dated May 11, 1998, between Northern Trust Corporation and Harris Trust and Savings Bank as Trustee (which, effective August 31, 1999, was succeeded by U.S. Trust Company, N.A., which effective June 1, 2009, was succeeded by Evercore Trust Company, N.A., and, which, effective October 19, 2017, was succeeded by Newport Trust Company) regarding the Supplemental Employee Stock Ownership Plan for Employees of The Northern Trust Company, the Supplemental Thrift-Incentive Plan for Employees of The Northern Trust Company, the Supplemental Pension Plan for Employees of The Northern Trust Company, and the Northern Trust Corporation Deferred Compensation Plan (incorporated herein by reference to Exhibit 10(iv) to the Corporation’s Quarterly Report on Form 10-Q for the quarter ended June 30, 1998).
(i)**	Amendment, dated August 31, 1999 (incorporated herein by reference to Exhibit 10(vi) to the Corporation’s Quarterly Report on Form 10-Q for the quarter ended September 30, 1999).
(ii)**	Second Amendment, dated as of May 16, 2000 (incorporated herein by reference to Exhibit 10(v) to the Corporation’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2000).
10.2**	Northern Trust Corporation Supplemental Employee Stock Ownership Plan, as amended and restated effective as of January 1, 2008 (incorporated herein by reference to Exhibit 10(vi) to the Corporation’s Annual Report on Form 10-K for the fiscal year ended December 31, 2008).
(i)**	Amendment Number One, dated December 28, 2022 and effective January 1, 2023 (incorporated herein by reference to Exhibit 10.2(i) to the Corporation’s Annual Report on Form 10-K for the fiscal year ended December 31, 2022).
10.3**	Northern Trust Corporation Supplemental Thrift-Incentive Plan, as amended and restated effective as of January 1, 2008 (incorporated herein by reference to Exhibit 10(vii) to the Corporation’s Annual Report on Form 10-K for the fiscal year ended December 31, 2008).
(i)**	Amendment Number One, dated October 29, 2009 and effective January 1, 2010 (incorporated herein by reference to Exhibit 10(vi)(1) to the Corporation’s Annual Report on Form 10-K for the fiscal year ended December 31, 2009).
(ii)**	Amendment Number Two, dated August 6, 2015 and effective January 1, 2015 (incorporated herein by reference to Exhibit 10.1 to the Corporation’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2015).
(iii)**	Amendment Number Three, dated December 28, 2022 and effective January 1, 2023 (incorporated herein by reference to Exhibit 10.3(iii) to the Corporation’s Annual Report on Form 10-K for the fiscal year ended December 31, 2022).
10.4**	Northern Trust Corporation Supplemental Pension Plan, as amended and restated effective January 1, 2009 (incorporated herein by reference to Exhibit 10(viii) to the Corporation’s Annual Report on Form 10-K for the fiscal year ended December 31, 2008).
(i)**	Amendment Number One, dated December 28, 2022 and effective January 1, 2023 (incorporated herein by reference to Exhibit 10.4(i) to the Corporation’s Annual Report on Form 10-K for the fiscal year ended December 31, 2022).
10.5**	Northern Trust Corporation Deferred Compensation Plan, as amended and restated effective as of January 1, 2024.
10.6**	Northern Trust Corporation 2012 Stock Plan (incorporated herein by reference to Exhibit 10.1 to the Corporation’s Current Report on Form 8-K filed April 19, 2012).
(i)**	Form of Director Stock Unit Agreement (incorporated herein by reference to Exhibit 10(iii) to the Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2012).
(ii)**	Form of Director Prorated Stock Agreement (incorporated herein by reference to Exhibit 10(iv) to the Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2012).
(iii)**	Form of New Director Stock Unit Agreement (incorporated herein by reference to Exhibit 10(v) to the Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2012).
(iv)**	Form of 2014 Executive Stock Option Terms and Conditions (incorporated herein by reference to Exhibit 10.7(xi) to the Corporation’s Annual Report on Form 10-K for the fiscal year ended December 31, 2013).

176 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

Exhibit Number	Description
(v)**	Form of 2017 Stock Option Award Terms and Conditions, as amended (incorporated herein by reference to Exhibit 10.7(x) to the Corporation's Annual Report on Form 10-K for the year ended December 31, 2017).
10.7**	Northern Trust Corporation 1997 Stock Plan for Non-Employee Directors (incorporated herein by reference to Exhibit 10(xix) to the Corporation’s Annual Report on Form 10-K for the fiscal year ended December 31, 1998).
10.8**	Northern Trust Corporation 1997 Deferred Compensation Plan for Non-Employee Directors, as amended and restated effective as of July 15, 2014 (incorporated herein by reference to Exhibit 10.1 to the Corporation’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2014).
10.9**	Northern Trust Corporation 2018 Deferred Compensation Plan for Non-Employee Directors (incorporated herein by reference to Exhibit 10.11 to the Corporation's Annual Report on Form 10-K for the year ended December 31, 2017).
10.10**	Northern Trust Corporation Key Officer Change in Control Severance Plan (incorporated herein by reference to Exhibit 10.2 to the Corporation’s Current Report on Form 8-K filed April 28, 2017).
10.11**	Northern Trust Corporation Executive Change in Control Severance Plan (incorporated herein by reference to Exhibit 10.1 to the Corporation’s Current Report on Form 8-K filed April 28, 2017).
10.12**	Form of Non-Solicitation Agreement and Confidentiality Agreement (incorporated herein by reference to Exhibit 10(iii) to the Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2009).
10.13**	Northern Trust Corporation 2017 Long-Term Incentive Plan (incorporated herein by reference to Exhibit 10.1 to the Corporation’s Current Report on Form 8-K filed April 26, 2017).
(i)**	Form of Director Stock Unit Agreement (incorporated herein by reference to Exhibit 10.10 to the Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2017).
(ii)**	Form of Director Stock Unit Agreement (prorated) (incorporated herein by reference to Exhibit 10.11 to the Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2017).
(iii)**	Form of 2021 Performance Stock Unit Award Terms and Conditions (incorporated herein by reference to Exhibit 10.1 to the Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2021).
(iv)**	Form of 2022 Performance Stock Unit Award Terms and Conditions (incorporated herein by reference to Exhibit 10.1 to the Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2022).
(v)**	Form of 2023 Performance Stock Unit Award Terms and Conditions (incorporated herein by reference to Exhibit 10.1 to the Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2023).
(vi)**	Form of 2020 Stock Unit Award Terms and Conditions (incorporated herein by reference to Exhibit 10.2 to the Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2020).
(vii)**	Form of 2021 Stock Unit Award Terms and Conditions (incorporated herein by reference to Exhibit 10.2 to the Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2021).
(viii)**	Form of 2022 Stock Unit Award Terms and Conditions (incorporated herein by reference to Exhibit 10.2 to the Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2022).
(ix)**	Form of 2023 Stock Unit Award Terms and Conditions (incorporated herein by reference to Exhibit 10.2 to the Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2023).
10.14**	Northern Trust Corporation Wealth Planning and Tax Consulting Services Plan, as amended and restated effective January 1, 2021 (incorporated herein by reference to Exhibit 10.1 to the Corporation’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2021).
10.15**	Northern Trust Corporation Non-Employee Director Compensation Plan, as amended (incorporated herein by reference to Exhibit 10.17 to the Corporation’s Annual Report on Form 10-K for the year ended December 31, 2021).
10.16**	Northern Partners Incentive Plan, as amended and restated on January 16, 2024.
10.17**	Letter Agreement with Frederick H. Waddell, dated January 23, 2019 (incorporated herein by reference to Exhibit 10.26 to the Corporation’s Annual Report on Form 10-K for the year ended December 31, 2018).
10.18**	The Northern Trust Company Death Benefit Plan (incorporated herein by reference to Exhibit 10.1 to the Corporation’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2019).

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 177

Exhibit Number	Description
(i)**	Amendment Number One to The Northern Trust Company Death Benefit Plan, dated July 11, 2019 and effective May 17, 2019 (incorporated herein by reference to Exhibit 10.20(i) to the Corporation’s Annual Report on Form 10-K for the year ended December 31, 2020).
(ii)**	Amendment Number Two to The Northern Trust Company Death Benefit Plan, dated July 29, 2019 and effective May 17, 2019 (incorporated herein by reference to Exhibit 10.20(ii) to the Corporation’s Annual Report on Form 10-K for the year ended December 31, 2020).
(iii)**	Amendment Number Three to The Northern Trust Company Death Benefit Plan, dated March 18, 2020 and effective May 17, 2019 (incorporated herein by reference to Exhibit 10.20(iii) to the Corporation’s Annual Report on Form 10-K for the year ended December 31, 2020).
(iv)**	Amendment Number Four to The Northern Trust Company Death Benefit Plan, dated June 22, 2022 and effective May 4, 2022 (incorporated herein by reference to Exhibit 10.19(iv) to the Corporation’s Annual Report on Form 10-K for the fiscal year ended December 31, 2022).
10.19**	Transition Agreement by and between Northern Trust Corporation and Shundrawn A. Thomas, dated as of May 3, 2022 (incorporated herein by reference to Exhibit 10.1 to the Corporation’s Current Report on Form 8-K filed May 3, 2022).
21	Subsidiaries of the Registrant.
23	Consent of Independent Registered Public Accounting Firm.
31.1	Rule 13a-14(a)/15d-14(a) Certification of CEO Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2	Rule 13a-14(a)/15d-14(a) Certification of CFO Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32	Certifications of CEO and CFO Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
97	Northern Trust Corporation Rule 10D-1 Incentive-Based Compensation Recoupment Policy
101	Includes the following financial and related information from the Corporation’s Annual Report on Form 10-K for the fiscal year ended December 31, 2023, formatted in Inline Extensible Business Reporting Language (iXBRL): (i) the Consolidated Balance Sheets, (ii) the Consolidated Statements of Income, (iii) the Consolidated Statements of Comprehensive Income, (iv) the Consolidated Statements of Changes in Stockholders’ Equity, (v) the Consolidated Statements of Cash Flows, and (vi) Notes to Consolidated Financial Statements.
104	The cover page from this Annual Report on Form 10-K, formatted in Inline XBRL.

** Indicates a management contract or a compensatory plan or agreement.

ITEM 16 – FORM 10-K SUMMARY

None.

178 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this Annual Report on Form 10-K to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: February 27, 2024

Northern Trust Corporation
(Registrant)
By:	/s/    Michael G. O’Grady
	Michael G. O’Grady
	Chairman and Chief Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this Annual Report on Form 10-K has been signed below by the following persons on behalf of the Registrant and in the capacities and on the date indicated.

2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION 179

Signature	Capacity
/s/    Michael G. O'Grady	Chairman and Chief Executive Officer (Principal Executive Officer)
Michael G. O’Grady
/s/    Jason J. Tyler	Executive Vice President and Chief Financial Officer (Principal Financial Officer)
Jason J. Tyler
/s/    John P. Landers	Senior Vice President and Controller (Principal Accounting Officer)
John P. Landers
/s/    Linda Walker Bynoe	Director
Linda Walker Bynoe
/s/    Susan Crown	Director
Susan Crown
/s/    Dean M. Harrison	Director
Dean M. Harrison
/s/    Jay L. Henderson	Director
Jay L. Henderson
/s/ Marcy S. Klevorn	Director
Marcy S. Klevorn
/s/ Siddharth N. (Bobby) Mehta	Director
Siddharth N. (Bobby) Mehta
/s/    Jose Luis Prado	Director
Jose Luis Prado
/s/    Martin P. Slark	Director
Martin P. Slark
/s/    David H.B. Smith, Jr.	Director
David H.B. Smith, Jr.
/s/    Donald Thompson	Director
Donald Thompson
/s/    Charles A. Tribbett, III	Director
Charles A. Tribbett, III

Date: February 27, 2024

180 2023 ANNUAL REPORT | NORTHERN TRUST CORPORATION

EX-4.3

Exhibit 4.3

DESCRIPTION OF SECURITIES REGISTERED

PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934

As of December 31, 2023, Northern Trust Corporation had two classes of securities registered under Section 12(b) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”): (1) common stock; and (2) depositary shares each representing a 1/1,000th ownership interest in a share of series E non-cumulative perpetual preferred stock (the “Series E Preferred Stock”).

The following summary of the terms and provisions of certain of our securities does not purport to be complete and is qualified in its entirety by reference to the pertinent sections of our Restated Certificate of Incorporation, as amended (including any and all Certificates of Designation creating, and any and all Certificates of Elimination eliminating, series of preferred stock) (the “Restated Certificate of Incorporation”) and our By-laws, as amended (the “By-laws”), which are incorporated by reference into the Annual Report on Form 10-K of which this Exhibit 4.3 is a part.

Unless otherwise indicated or the context otherwise requires, references in this Exhibit 4.3 to “Northern Trust,” “the Corporation,” “we,” “us” and “our” are to Northern Trust Corporation, excluding our subsidiaries.

Description of Common Stock

Shares Authorized; Shares Outstanding

Our authorized capital stock includes 560,000,000 shares designated as common stock, $1.66 ⅔ par value per share, of which 205,126,224 shares were outstanding as of December 31, 2023.

All of our existing common stock is validly issued, fully paid and nonassessable.

Dividends

Holders of common stock are entitled to receive the dividends that may be declared from time to time by the board of directors. The rights of holders of common stock to receive dividends are subject to the prior rights of holders of any issued and outstanding preferred stock.

Voting Rights

Holders of common stock vote as a single class on all matters submitted to a vote of the stockholders with each share of common stock entitled to one vote. Holders of common stock do not have cumulative voting rights.

Liquidation Rights

Upon voluntary or involuntary liquidation, dissolution, or winding up of the Corporation, the holders of the common stock are entitled to receive, pro rata according to the number of shares held by

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each, all of our assets remaining for distribution after payment to creditors and the holders of any issued and outstanding preferred stock of the full preferential amounts to which they are entitled.

No Other Rights

The common stock has no preemptive or other subscription rights, and there are no other conversion rights, sinking fund or redemption provisions with respect to the shares of common stock.

Anti-Takeover Effects of Our Restated Certificate of Incorporation and By-lawsandCertain Provisions of Delaware Law

Our Restated Certificate of Incorporation and By-laws and some provisions of Delaware law contain provisions that may delay, defer or discourage another party from acquiring control of us. These provisions, summarized below, are intended to discourage coercive takeover practices and inadequate takeover bids. These provisions are also designed to encourage persons seeking to acquire control of us to first negotiate with the board of directors, which may result in an improvement of the terms of any such acquisition in favor of our stockholders. However, they also give the board of directors the power to discourage acquisitions that some stockholders may favor.

Size of Board and Vacancies

Our By-laws provide that the number of directors on our board is fixed by the board of directors. If any vacancy occurs in our board of director, or if the board authorizes any increase in the number of directors, a majority of the remaining directors then in office, may elect a director to fill the vacancy until the next annual meeting of stockholders or until his or her successor is elected.

Stockholder Meetings

Our By-laws provide that only our board of directors, chairman, or president may call special meetings of the stockholders. Stockholders who in the aggregate beneficially own at least 25% of the voting power of all outstanding shares of our common stock also may call a special meeting of the stockholders through the Secretary upon proper written request to the Secretary.

Advance Notice Procedures

Our By-laws establish an advance notice procedure for stockholder proposals to be brought before an annual meeting of our stockholders, including proposed nominations of persons for election to the board of directors. Stockholders at an annual meeting will only be able to consider proposals or nominations specified in the notice of meeting or brought before the meeting by or at the direction of the board of directors or by a stockholder who was a stockholder of record on the record date for the meeting, who is entitled to vote at the meeting and who has given our Secretary timely written notice, in proper form, of the stockholder’s intention to bring that business before the meeting. Although the By-laws do not give the board of directors the power to approve or disapprove stockholder nominations of candidates or proposals regarding other business to be conducted at a special or annual meeting, the By-laws may have the effect of precluding the conduct of certain business at a meeting if the proper procedures are not followed or may

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discourage or deter a potential acquiror from conducting a solicitation of proxies to elect its own slate of directors or otherwise attempting to obtain control of us.

Authorized But Unissued Shares

We have authorized but unissued shares of common stock and preferred stock, and our board of directors may authorize the issuance of one or more series of preferred stock without shareholder approval. These shares could be used by our board of directors to make it more difficult or to discourage an attempt to obtain control of us through a merger, tender offer, proxy contest or otherwise.

Delaware Anti-Takeover Statute

We are subject to Section 203 of the Delaware General Corporation Law (“Section 203”), an anti-takeover law. In general, Section 203 prohibits a publicly held Delaware corporation from engaging in a business combination with an interested stockholder for a period of three years following the date such person became an interested stockholder, unless the business combination or the transaction in which such person became an interested stockholder is approved in a prescribed manner. Generally, a “business combination” includes a merger, asset or stock sale, or other transaction resulting in a financial benefit to the interested stockholder. Generally, an “interested stockholder” is a person that, together with affiliates and associates, owns, or within three years prior to the determination of interested stockholder status did own, 15% or more of a corporation’s voting stock. The existence of this provision may have an anti-takeover effect with respect to transactions not approved in advance by the board of directors, including discouraging attempts that might result in a premium over the market price for the shares of common stock.

Listing

Our common stock is listed on the Nasdaq Global Select Market under the symbol “NTRS.”

Transfer Agent and Registrar

The transfer agent and registrar for our common stock is Equiniti Trust Company.

Description of Preferred Stock - General

Our authorized capital stock includes 10,000,000 shares of preferred stock, without par value. Our board of directors is authorized to issue preferred stock in one or more series, to fix the number of shares in each series, and to determine the designations and preferences, limitations and relative rights of each series, including but not limited to dividend rates, voting rights, terms of redemption, liquidation preferences, sinking fund requirements and conversion rights, all without any vote or other action on the part of stockholders. This power is limited by applicable laws or regulations and may be delegated to a committee of the board of directors.

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Description of Series E Preferred Stock

Shares Authorized; Shares Outstanding

As of December 31, 2023, there were authorized and outstanding 16,000 shares of Series E Preferred Stock. Depositary shares representing interests in the shares of the Series E Preferred Stock are registered pursuant to Section 12(b) of the Exchange Act and are described under “Description of Series E Depositary Shares” below.

General

The depositary, as described under “Description of Series E Depositary Shares” herein, is the sole holder of the Series E Preferred Stock and all references to the holders of the Series E Preferred Stock shall mean the depositary. However, the holders of depositary shares are entitled, through the depositary, to exercise the rights and preferences of the holders of the Series E Preferred Stock, as described under “Description of Series E Depositary Shares.”

The Series E Preferred Stock is a single series of authorized preferred stock consisting of 16,000 shares. We may from time to time, without notice to or the consent of holders of the Series E Preferred Stock, issue additional shares of preferred stock, including shares of the Series E Preferred Stock. Any such additional shares of Series E Preferred Stock would form a single series with the Series E Preferred Stock already issued. In addition, we may from time to time, without notice to or consent of holders of the Series E Preferred Stock, issue additional shares of preferred stock that rank equally with or junior to the Series E Preferred Stock.

Shares of the Series E Preferred Stock rank senior to our common stock and all other junior stock, and at least equally with each other series of our preferred stock we have issued or may issue (except for any senior series that may be issued with the consent of the holders of the Series E Preferred Stock and the consent of any other series of preferred stock as may be required) and all other parity stock, with respect to the payment of dividends and distributions of our assets upon liquidation, dissolution or winding up. In addition, we are generally able to pay dividends and distributions upon liquidation, dissolution or winding up only out of legally available assets for such payment (i.e., after taking account of all indebtedness and other non-equity claims) and pro rata as to any parity stock. As discussed below, the only series of parity stock outstanding as of December 31, 2023 was our unregistered Series D Non-Cumulative Perpetual Preferred Stock (the “Series D Preferred Stock”). Shares of the Series E Preferred Stock rank junior to all of our existing and future indebtedness and other non-equity claims on us with respect to assets available to satisfy claims on us, including in our liquidation.

The Series E Preferred Stock is fully paid and nonassessable. Holders of Series E Preferred Stock do not have preemptive or subscription rights to acquire more of our capital stock. Further, each holder’s interest in the shares of the Series E Preferred Stock may be fully subordinated to interests held by the U.S. government in the event that we enter into a bankruptcy, receivership, insolvency, liquidation, or similar proceeding, including a proceeding under the Orderly Liquidation Authority of the Dodd-Frank Act.

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The Series E Preferred Stock is not convertible into, or exchangeable for, shares of any other class or series of our stock or other securities. The Series E Preferred Stock has no stated maturity and is not subject to any sinking fund or other obligation of us to redeem or repurchase the Series E Preferred Stock.

Dividends

Dividends on shares of the Series E Preferred Stock are not mandatory. Holders of the Series E Preferred Stock are entitled to receive non-cumulative cash dividends, if, when and as declared by our board of directors or a duly authorized committee of the board, out of legally available assets. Dividends on each share of Series E Preferred Stock accrue on the liquidation preference amount of $25,000 per share (equivalent to $25 per depositary share) at a rate per annum equal to 4.70%. Dividends are payable in arrears on each dividend payment date. A “dividend payment date” means the 1st day of January, April, July and October of each year, commencing on April 1, 2020. If any such date is not a business day, then such date will nevertheless be a dividend payment date but dividends on the Series E Preferred Stock, when, as and if declared, will be paid on the next succeeding business day (without any adjustment to the amount of the dividend paid per share of the Series E Preferred Stock). A business day means any weekday on which banking institutions are not authorized or obligated by law, regulation or executive order to close in New York, New York.

A dividend period is the period from, and including, a dividend payment date to, but excluding, the next dividend payment date, except that the initial dividend period commenced on and included the original issue date of the Series E Preferred Stock.

The amount of dividends payable for any dividend period per share of the Series E Preferred Stock is calculated on the basis of a 360-day year consisting of twelve 30-day months.

In the event that we issue additional shares of Series E Preferred Stock after the original issue date, dividends on such shares will accrue from the original issue date of such additional shares. Notwithstanding the foregoing, dividends on the Series E Preferred Stock shall not be declared, paid or set aside for payment to the extent such act would cause us to fail to comply with laws and regulations applicable thereto, including applicable capital regulations.

Dividends are payable to holders of record of Series E Preferred Stock as they appear on our books on the applicable record date, which shall be the 15th day of the calendar month immediately preceding the month during which the dividend payment date falls. The corresponding record dates for the depositary shares are the same as the record dates for the Series E Preferred Stock.

Dividends on shares of Series E Preferred Stock are not cumulative. Accordingly, if the board of directors or a duly authorized committee of the board does not declare a dividend on the Series E Preferred Stock payable in respect of any dividend period before the related dividend payment date, such dividend will not accrue or be payable and we will have no obligation to pay a dividend for that dividend period on the dividend payment date or at any future time, whether or not dividends on the Series E Preferred Stock are declared for any future dividend period.

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Restrictions on Dividends

So long as any share of Series E Preferred Stock remains outstanding, unless the full dividends for the most recently completed dividend period on all outstanding shares of Series E Preferred Stock have been declared and paid or declared and a sum sufficient for the payment thereof has been set aside:

(1) no dividend shall be declared or paid or set aside for payment and no distribution shall be declared or made or set aside for payment on any junior stock (other than a dividend payable solely in junior stock or any dividend in connection with the implementation of a stockholders’ rights plan, or the redemption or repurchase of any rights under any such plan);

(2) no shares of junior stock shall be repurchased, redeemed or otherwise acquired for consideration by us, directly or indirectly (other than (a) as a result of a reclassification of junior stock for or into other junior stock; (b) the exchange or conversion of one share of junior stock for or into another share of junior stock; (c) through the use of the proceeds of a substantially contemporaneous sale of other shares of junior stock; (d) purchases, redemptions or other acquisitions of shares of junior stock in connection with any employment contract, benefit plan or other similar arrangement with or for the benefit of employees, officers, directors or consultants; (e) purchases of shares of junior stock pursuant to a contractually binding requirement to buy junior stock existing prior to the preceding dividend period, including under a contractually binding stock repurchase plan; (f) the purchase of fractional interests in shares of junior stock pursuant to the conversion or exchange provisions of such stock or the security being converted or exchanged; (g) purchases or other acquisitions by any of our broker-dealer subsidiaries solely for the purpose of market making, stabilization or customer facilitation transactions in junior stock in the ordinary course of business; (h) purchases by any of our broker-dealer subsidiaries of our capital stock for resale pursuant to an offering by us of such capital stock underwritten by such broker-dealer subsidiary; or (i) the acquisition by us or any of our subsidiaries of record ownership in junior stock for the beneficial ownership of any other persons (other than for the beneficial ownership by us or any of our subsidiaries), including as trustees or custodians) nor shall any monies be paid to or made available for a sinking fund for the redemption of any such securities by us; and

(3) no shares of parity stock shall be repurchased, redeemed or otherwise acquired for consideration by us (other than (a) pursuant to pro rata offers to purchase all, or a pro rata portion, of the Series E Preferred Stock and such parity stock; (b) as a result of a reclassification of parity stock for or into other parity stock or junior stock; (c) the exchange or conversion of parity stock for or into other parity stock or junior stock; (d) through the use of the proceeds of a substantially contemporaneous sale of other shares of parity stock or junior stock; (e) purchases of shares of parity stock pursuant to a contractually binding requirement to buy parity stock existing prior to the preceding dividend period, including under a contractually binding stock repurchase plan; (f) the purchase of fractional interests in shares of parity stock pursuant to the conversion or exchange provisions of such stock or the security being converted or exchanged; (g) purchases or other acquisitions by any of our broker-dealer subsidiaries solely for the purpose of market making, stabilization or customer facilitation transactions in parity stock in the ordinary course of business; (h) purchases by any of our broker-dealer subsidiaries of our capital stock for resale pursuant to an offering by us of such capital stock underwritten by such broker-dealer subsidiary; or (i) the acquisition by us or any of our subsidiaries of record ownership in parity stock for the beneficial ownership of any other persons (other than for the beneficial ownership by us or any of our subsidiaries), including as trustees or custodians).

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As used in this Description of Series E Preferred Stock, “junior stock” means our common stock, our Series A Junior Participating Preferred Stock (if and when issued and outstanding), and any other class or series of our stock hereafter authorized over which the Series E Preferred Stock has preference or priority in the payment of dividends or in the distribution of our assets on any liquidation, dissolution or winding up of Northern Trust.

When dividends are not paid in full upon the shares of Series E Preferred Stock and any parity stock, all dividends declared upon shares of Series E Preferred Stock and any parity stock will be declared on a proportional basis so that the amount of dividends declared per share will bear to each other the same ratio that accrued dividends per share on Series E Preferred Stock, and accrued dividends, including any accumulations, on any parity stock, bear to each other. To the extent a dividend period with respect to any parity stock coincides with more than one dividend period with respect to the Series E Preferred Stock, for purposes of the immediately preceding sentence, our board of directors will treat such dividend period(s) with respect to any parity stock and dividend period(s) with respect to the Series E Preferred Stock in a manner that it deems to be fair and equitable in order to achieve proportional payments of dividends on such parity stock and the Series E Preferred Stock. To the extent a dividend period with respect to the Series E Preferred Stock coincides with more than one dividend period with respect to any parity stock, for purposes of the first sentence of this paragraph, our board of directors will treat such dividend period(s) with respect to the Series E Preferred Stock and dividend period(s) with respect to any parity stock in a manner that it deems to be fair and equitable in order to achieve proportional payments of dividends on the Series E Preferred Stock and such parity stock. For the purposes of this paragraph, the term “dividend period” as used with respect to any parity stock means such dividend periods as are provided for in the terms of such parity stock.

As used in this Description of Series E Preferred Stock, “parity stock” means our Series D Preferred Stock and any other class or series of our stock hereafter authorized that ranks equally with the Series E Preferred Stock in the payment of dividends (whether such dividends are cumulative or non-cumulative) and in the distribution of our assets on any liquidation, dissolution or winding up of Northern Trust. As of December 31, 2023, 5,000 shares of our Series D Preferred Stock were the only shares of parity stock outstanding. The Series D Preferred Stock has a liquidation preference of $100,000 per share (or $1,000 per depositary share). Holders of Series D Preferred Stock are entitled to non-cumulative dividends, when, as and if declared by our board of directors or a duly authorized committee of the board, at a rate per annum equal to (i) 4.60% from the original issue date of the Series D Preferred Stock to but excluding October 1, 2026; and (ii) a floating rate equal to the three-month CME Term Secured Overnight Finance Rate (the replacement to the three-month LIBOR rate, as administered by CME Group Benchmark Administration, Ltd.) plus a statutory spread adjustment of 0.26161% (as set forth in the final rule to implement the Adjustable Interest Rate (LIBOR) Act) plus 3.202% from and including October 1, 2026.

Subject to the foregoing, and not otherwise, such dividends (payable in cash, stock or otherwise), as may be determined by our board of directors or a duly authorized committee of the board, may be declared and paid on our common stock and any other stock ranking equally with or junior to the Series E Preferred Stock from time to time out of any assets legally available for such payment, and the holders of the Series E Preferred Stock shall not be entitled to participate in any such dividends.

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Liquidation Rights

Upon any voluntary or involuntary liquidation, dissolution or winding up of Northern Trust, holders of the Series E Preferred Stock are entitled to receive out of our assets legally available for distribution to stockholders, before any distribution of assets may be made to or set aside for the holders of common stock or any other junior stock, after satisfaction of liabilities to creditors and subject to the rights of holders of any securities ranking senior to the Series E Preferred Stock, a liquidating distribution in the amount of the liquidation preference of $25,000 per share (equivalent to $25 per depositary share) plus declared and unpaid dividends, without accumulation of any undeclared dividends. Holders of the Series E Preferred Stock are not entitled to any other amounts from us after they have received their full liquidating distribution.

In any such distribution, if our assets are not sufficient to pay the liquidation preference plus declared and unpaid dividends in full to all holders of the Series E Preferred Stock and all holders of any parity stock the amounts paid to the holders of Series E Preferred Stock and to the holders of all such parity stock will be paid pro rata in accordance with the respective aggregate liquidating distribution owed to those holders. If the liquidation preference plus declared and unpaid dividends has been paid in full to all holders of Series E Preferred Stock and any parity stock, the holders of our junior stock shall be entitled to receive all remaining assets of Northern Trust according to their respective rights and preferences.

For purposes of this section, the sale, lease, conveyance or transfer (for cash, securities or other property) of all or substantially all of the property and assets of Northern Trust, or any merger or consolidation of Northern Trust with or into any other entity (for cash, securities or other property), shall not be deemed a liquidation, dissolution or winding up of Northern Trust.

The shares of Series E Preferred Stock may be fully subordinated to interests held by the U.S. government in the event that we enter into a receivership, insolvency, liquidation or similar proceeding, including a proceeding under the Orderly Liquidation Authority of the Dodd-Frank Act.

Redemption

The Series E Preferred Stock is not subject to any mandatory redemption, sinking fund or other similar provision. Except as described below, the Series E Preferred Stock is not redeemable prior to January 1, 2025. On any dividend payment date on or after January 1, 2025, the Series E Preferred Stock is redeemable at our option, in whole at any time, or in part from time to time, at a redemption price equal to $25,000 per share (equivalent to $25 per depositary share), plus any declared and unpaid dividends, without accumulation of any undeclared dividends. Holders of Series E Preferred Stock have no right to require the redemption or repurchase of the Series E Preferred Stock.

Notwithstanding the foregoing, within 90 days following the occurrence of a “regulatory capital treatment event,” we may, at our option, subject to the approval of the appropriate federal banking agency, provide notice of our intent to redeem in accordance with the procedures described below, and subsequently redeem, all (but not less than all) of the shares of Series E Preferred Stock at the time outstanding at a redemption price equal to $25,000 per share (equivalent to $25 per depositary share), plus any declared and unpaid dividends, without accumulation of any undeclared dividends.

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A “regulatory capital treatment event” means the good faith determination by us that, as a result of any

•amendment to, or change (including any announced prospective change) in, the laws or regulations of the United States or any political subdivision of or in the United States that is enacted or becomes effective after the initial issuance of any share of Series E Preferred Stock;

•proposed change in those laws or regulations that is announced after the initial issuance of any share of Series E Preferred Stock; or

•official administrative decision or judicial decision or administrative action or other official pronouncement interpreting or applying those laws or regulations that is announced after the initial issuance of any share of Series E Preferred Stock

there is more than an insubstantial risk that we will not be entitled to treat the full liquidation preference of the shares of Series E Preferred Stock then outstanding as additional tier 1 capital (or its equivalent) for purposes of the capital adequacy rules of the Federal Reserve in 12 CFR Part 217 (or, as and if applicable, the capital adequacy rules and regulations of any successor appropriate federal banking agency), as then in effect and applicable, for as long as any share of Series E Preferred Stock is outstanding.

If shares of the Series E Preferred Stock are to be redeemed, the notice of redemption shall be given by first class mail to the holders of record of the Series E Preferred Stock to be redeemed, mailed not less than 30 days nor more than 60 days prior to the date fixed for redemption thereof (provided that, if the Series E Preferred Stock is held in book-entry form through DTC, we may give such notice in any manner permitted by DTC). Each notice of redemption shall state: (1) the redemption date; (2) the number of shares of the Series E Preferred Stock to be redeemed and, if less than all the shares held by such holder are to be redeemed, the number of such shares to be redeemed from such holder; (3) the redemption price; (4) the place or places where the certificates evidencing shares of Series E Preferred Stock are to be surrendered for payment of the redemption price; and (5) that dividends on the shares to be redeemed will cease to accrue on the redemption date. If notice of redemption of any shares of Series E Preferred Stock has been duly given and if the funds necessary for such redemption have been set aside by us for the benefit of the holders of any shares of Series E Preferred Stock so called for redemption, then, on and after the redemption date, such shares of Series E Preferred Stock shall no longer be deemed outstanding, dividends will cease to accrue on such shares of Series E Preferred Stock and all rights of the holders of such shares will terminate, except the right to receive the redemption price. See “Description of Series E Depositary Shares” below for information about redemption of the depositary shares relating to our Series E Preferred Stock.

In case of any redemption of only part of the shares of the Series E Preferred Stock at the time outstanding, the shares to be redeemed shall be selected either pro rata, by lot or in such other manner as we may determine to be fair and equitable.

Under the Federal Reserve’s current risk-based capital regulations applicable to bank holding companies, any redemption of the Series E Preferred Stock is subject to prior approval of the Federal Reserve, and Northern Trust legally must either replace the shares to be redeemed with an equal amount of instruments that qualify as common equity tier 1 capital or additional tier 1 capital, or demonstrate to the Federal Reserve that following such redemption Northern Trust will continue to hold capital commensurate with its risk.

NTAC:3NS-20

Voting Rights

The holders of the Series E Preferred Stock do not have voting rights other than those described below, except as expressly provided by Delaware law.

So long as any shares of Series E Preferred Stock remain outstanding:

•the affirmative vote or consent of the holders of at least two-thirds of all of the shares of the Series E Preferred Stock at the time outstanding, voting separately as a single class, shall be required to amend the provisions of Northern Trust’s Restated Certificate of Incorporation, as amended (including the Certificate of Designation of the Series E Preferred Stock or any other series of preferred stock), or Northern Trust’s bylaws so as to materially and adversely affect the powers, preferences, privileges or rights of the Series E Preferred Stock, taken as a whole; provided, however, that any increase in the amount of the authorized or issued Series E Preferred Stock or authorized preferred stock or the creation and issuance, or an increase in the authorized or issued amount, of other series of preferred stock ranking equally with and/or junior to the Series E Preferred Stock with respect to the payment of dividends (whether such dividends are cumulative or non-cumulative) and/or the distribution of assets upon liquidation, dissolution or winding up of Northern Trust will not be deemed to adversely affect the powers, preferences, privileges or rights of the Series E Preferred Stock; and

•the affirmative vote or consent of the holders of at least two-thirds of all of the shares of the Series E Preferred Stock at the time outstanding, voting separately as a single class, shall be required to issue, authorize or increase the authorized amount of, or to issue or authorize any obligation or security convertible into or evidencing the right to purchase, any class or series of stock ranking senior to the Series E Preferred Stock and all other parity stock with respect to payment of dividends or the distribution of assets upon liquidation, dissolution or winding up of Northern Trust.

The foregoing voting provisions do not apply if, at or prior to the time when the act with respect to which such vote would otherwise be required shall be effected, all outstanding shares of Series E Preferred Stock shall have been redeemed or called for redemption upon proper notice and sufficient funds shall have been set aside by us for the benefit of the holders of the Series E Preferred Stock to effect such redemption.

Listing

There is no separate public trading market for the shares of our Series E Preferred Stock except as represented by the depositary shares representing interests therein. See “Description of Series E Depositary Shares—Listing” below.

Transfer Agent and Registrar

The registrar, dividend disbursing agent and redemption agent for our Series E Preferred Stock is Equiniti Trust Company.

NTAC:3NS-20

Description of Series E Depositary Shares

General

We issued fractional interests in shares of the Series E Preferred Stock in the form of depositary shares. Each depositary share represents a 1/1,000th ownership interest in a share of Series E Preferred Stock, and is evidenced by a depositary receipt. The shares of Series E Preferred Stock represented by depositary shares were deposited under a deposit agreement among Northern Trust, Equiniti Trust Company, as depositary, and the holders from time to time of the depositary receipts evidencing the depositary shares. Subject to the terms of the deposit agreement, each holder of a depositary share is entitled, through the depositary, in proportion to the applicable fraction of a share of Series E Preferred Stock represented by such depositary share, to all the rights and preferences of the Series E Preferred Stock represented thereby (including dividend, voting, redemption and liquidation rights).

References to “holders” of depositary shares mean those who own depositary shares registered in their own names, on the books that we or the depositary maintain for this purpose, and not indirect holders who own beneficial interests in depositary shares registered in street name or issued in book-entry form through DTC.

Dividends and Other Distributions

The depositary will distribute any cash dividends or other cash distributions received in respect of the deposited Series E Preferred Stock to the record holders of depositary shares relating to the underlying Series E Preferred Stock in proportion to the number of depositary shares held by the holders. The depositary will distribute any property received by it other than cash to the record holders of depositary shares entitled to those distributions, unless it determines that the distribution cannot be made proportionally among those holders or that it is not feasible to make a distribution. In that event, the depositary may, with our approval, sell the property and distribute the net proceeds from the sale to the holders of the depositary shares in proportion to the number of depositary shares they hold.

Record dates for the payment of dividends and other matters relating to the depositary shares will be the same as the corresponding record dates for the Series E Preferred Stock.

The amounts distributed to holders of depositary shares will be reduced by any amounts required to be withheld by the depositary or by us on account of taxes or other governmental charges. Additionally, each holder of depositary shares representing interests in the Series E Preferred Stock may be fully subordinated to interests held by the U.S. government in the event that we enter into a bankruptcy, receivership, insolvency, liquidation or similar proceeding.

Redemption of Depositary Shares

If we redeem the Series E Preferred Stock represented by the depositary shares, the depositary shares will be redeemed from the proceeds received by the depositary resulting from the redemption of the Series E Preferred Stock held by the depositary. The redemption price per depositary share will be equal to 1/1,000th of the redemption price per share payable with respect to the Series E Preferred Stock (or $25 per depositary share), plus any declared and unpaid dividends, without accumulation of any undeclared

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dividends. Whenever we redeem shares of Series E Preferred Stock held by the depositary, the depositary will redeem, as of the same redemption date, the number of depositary shares representing the Series E Preferred Stock so redeemed.

In case of any redemption of less than all of the outstanding depositary shares, the depositary shares to be redeemed will be selected by the depositary pro rata or in such other manner determined by the depositary to be fair and equitable. In any such case, depositary shares will be redeemed only in increments of 1,000 shares and any multiple thereof.

Voting the Series E Preferred Stock

When the depositary receives notice of any meeting at which the holders of the Series E Preferred Stock are entitled to vote, the depositary will mail the information contained in the notice to the record holders of the depositary shares relating to the Series E Preferred Stock. Each record holder of the depositary shares on the record date, which will be the same date as the record date for the Series E Preferred Stock, may instruct the depositary to vote the amount of the Series E Preferred Stock represented by the holder’s depositary shares. To the extent reasonably practicable, the depositary will vote the amount of the Series E Preferred Stock represented by depositary shares in accordance with the instructions it receives. We will agree to take all reasonable actions that the depositary determines are necessary to enable the depositary to vote as instructed. If the depositary does not receive specific instructions from the holders of any depositary shares representing the Series E Preferred Stock, it will vote such depositary shares proportionately with instructions received.

Listing

The depositary shares representing interests in the shares of our Series E Preferred Stock are listed on the Nasdaq Global Select Market under the symbol “NTRSO.”

There is no separate public trading market for the shares of the Series E Preferred Stock except as represented by the depositary shares representing interests in the shares of the Series E Preferred Stock.

Form of Preferred Stock and Depositary Shares

The depositary shares were issued in book-entry form through DTC. The Series E Preferred Stock was issued in registered form to the depositary as described in “Description of Series E Preferred Stock” above.

Amendment and Termination of the Deposit Agreement

The form of depositary receipt evidencing the depositary shares and any provision of the deposit agreement may be amended by agreement between us and the depositary. However, any amendment that materially and adversely alters the rights of the holders of depositary shares will not be effective unless the amendment has been approved by at least a majority (or, in the case of such amendments relating to or affecting rights to receive dividends or distributions or voting or redemption rights, holders of at least two-

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thirds) of the outstanding depositary shares. The deposit agreement may be terminated by the depositary or us only if:

•all outstanding depositary shares have been redeemed; or

•there has been a final distribution of the preferred stock in connection with our liquidation, dissolution or winding up and such distribution has been made to all the holders of depositary shares.

NTAC:3NS-20

EX-10.5

Exhibit 10.5

NORTHERN TRUST CORPORATION
DEFERRED COMPENSATION PLAN

(As Amended and Restated Effective as of January 1, 2024)

INTRODUCTION

The Northern Trust Corporation Deferred Compensation Plan (the “Plan”) was established by Northern Trust Corporation, a Delaware corporation (the “Corporation”) effective as of May 1, 1998. The primary purpose of the Plan is to provide a select group of management or highly compensated employees of the Corporation (and its subsidiaries and affiliates) with the opportunity to voluntarily defer all or a portion of their Incentive Compensation (as defined in Article I below). The Plan is also intended to provide Participants in the Plan with the ability to save on a tax-deferred basis. The Plan was amended and restated effective as of November 1, 2017 and most recently as of October 18, 2021. The Corporation now hereby amends and restates the Plan, generally effective January 1, 2024, with respect to amounts attributable to services performed in 2024 and years thereafter, except as otherwise indicated (with such other effective dates as are noted herein) to make certain design changes and to update the Plan for changes in the regulations under Code Section 409A.

ARTICLE I
DEFINITIONS

Wherever used herein the following terms shall have the meanings hereinafter set forth:

1.1“Assigned Base Salary” means the regular annual base wage rate of the Participant, excluding overtime wages or wages related to shift differential.

1.2“Beneficiary” (effective September 1, 2023) means the person or persons, including a trust, eligible to receive a death benefit under the Plan as designated by the Participant, in the event of the death of the Participant, subject to Section 5.5. To make an effective Beneficiary designation, the Participant must use the applicable paper or electronic form provided by the Plan, and any attempt by a Participant to designate a Beneficiary by any other means or method shall be ineffective, null and void, and shall not be recognized by the Plan

If a designated primary Beneficiary shall die before the Participant, their interest shall terminate and, if the designation included more than one primary Beneficiary, such interest shall be paid to those primary Beneficiaries, if any, who survive the Participant, pro rata based on their original designated shares, provided, however, that if the designation does not include a primary Beneficiary who survives the Participant, such interest shall be paid, first, to the Participant’s contingent Beneficiaries, if any, pursuant to the same rules that would apply to determine allocation of payments among a Participant’s primary Beneficiaries, and, if the Participant has designated no contingent Beneficiaries, to the Participant’s Beneficiary as determined in accordance with Section 1.2(i) – (v), below.

If at the time of a Participant’s death, there is outstanding a primary Beneficiary designation specifying more than one primary Beneficiary, and at that time the designation of any one or more of those primary Beneficiaries is for any reason ineffective, as determined by the Committee, then the Participant’s interest shall be paid to their remaining designated primary Beneficiaries who survive the Participant, pro rata based on their original designated shares. If the Participant does not designate a primary Beneficiary, or if the designation of their sole primary Beneficiary or all of their primary Beneficiaries is for any reason ineffective, as determined by the Committee, the Participant’s interest shall be paid, first, to the Participant’s contingent Beneficiaries, pursuant to the same rules that would apply to determine the allocation of payments among a Participant’s primary Beneficiaries,

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and, if the Participant has designated no contingent Beneficiaries, the Participant’s interest shall be paid to their Beneficiary determined as follows:

(i)the Participant’s spouse, or, if none,

(ii)the Participant’s biological or legally adopted children (in equal amounts) or, if none,

(iii)the Participant’s parents (in equal amounts) or, if none,

(iv)the Participant’s siblings (in equal amounts) or, if none,

(v)the Participant’s estate.

1.3“Board” means the Board of Directors of the Corporation.

1.4A “Change in Control” shall be deemed to have occurred if the event set forth in any one of the following paragraphs shall have occurred:

(a)any Person is or becomes the Beneficial Owner, directly or indirectly, of securities of the Corporation (not including in the securities beneficially owned by such Person any securities acquired directly from the Corporation or its Affiliates) representing 30% or more of the combined voting power of the Corporation's then outstanding securities, excluding any Person who becomes such a Beneficial Owner in connection with a transaction described in clause (i) of paragraph (c) below;

(b)the election to the Board, without the recommendation or approval of two- thirds of the incumbent Board, of directors constituting a majority of the number of directors of the Corporation then in office, provided, however, that directors whose initial assumption of office is in connection with an actual or threatened election contest, including but not limited to a consent solicitation, relating to the election of directors of the Corporation will not be considered as incumbent members of the Board for purposes of this section; or

(c)there is consummated a merger or consolidation of the Corporation or any direct or indirect Subsidiary of the Corporation with any other company, other than (i) a merger or consolidation which would result in the voting securities of the Corporation outstanding immediately prior to such merger or consolidation continuing to represent (either by remaining outstanding or by being converted into voting securities of the surviving entity or any parent thereof), at least 60% of the combined voting power of the securities of the Corporation or such surviving entity or any parent thereof outstanding immediately after such merger or consolidation, or (ii) a merger or consolidation effected to implement a recapitalization of the Corporation (or similar transaction) in which no Person is or becomes the Beneficial Owner, directly or indirectly, of securities of the Corporation (not including in the securities beneficially owned by such Person any securities acquired directly from the Corporation or its Affiliates) representing 20% or more of the combined voting power of the Corporation's then outstanding securities; or

(d)there is consummated the sale or disposition by the Corporation of all or substantially all of the Corporation's assets, other than a sale or disposition by the Corporation of all or substantially all of the Corporation's assets to an entity, at least 60% of the combined voting power of the voting securities of which are owned by stockholders of the Corporation in substantially the same proportions as their ownership of the Corporation immediately prior to such sale or the stockholders of

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the Corporation approve a plan of complete liquidation or dissolution of the Corporation.

Notwithstanding the foregoing, a “Change in Control” shall not be deemed to have occurred by virtue of the consummation of any transaction or series of integrated transactions immediately following which the record holders of the common stock of the Corporation immediately prior to such transaction or series of transactions continue to have substantially the same proportionate ownership in an entity which owns all or substantially all of the assets of the Corporation immediately following such transaction or series of transactions.

For purposes of this Section 1.4 the following definitions shall apply:

“Affiliate” shall have the meaning set forth in Rule 12b-2 under Section 12 of the Exchange Act; “Beneficial Owner” shall have the meaning set forth in Rule 13d-3 under the Exchange Act, except that a Person shall not be deemed to be the Beneficial Owner of any securities with respect to which such Person has properly filed a Form 13-G; “Exchange Act” shall mean the Securities Exchange Act of 1934, as amended; and “Person” shall have the meaning given in Section 3(a)(9) of the Exchange Act, as modified and used in Sections 13(d) and 14(d) thereof, except that such term shall not include (i) the Corporation or any of its Affiliates, (ii) a trustee or other fiduciary holding securities under an employee benefit plan of the Corporation or any of its Subsidiaries, (iii) an underwriter temporarily holding securities pursuant to an offering of such securities or (iv) a corporation owned, directly or indirectly, by the stockholders of the Corporation in substantially the same proportions as their ownership of stock of the Corporation. “Subsidiary” shall mean any corporation, limited liability company, partnership, joint venture or similar entity in which the Corporation owns, directly or indirectly, an equity interest possessing more than 50% of the combined voting power of the total outstanding equity interests of such entity.

1.5“Code” means the Internal Revenue Code of 1986, as amended from time to time.

1.6“Committee” means the Employee Benefit Administrative Committee, which has the responsibility for administering various benefit plans of the Company, as constituted from time to time.

1.7“Company” means The Northern Trust Company, an Illinois banking corporation; the Corporation; and such U.S. Related Companies as shall, with the consent of the Board, adopt the Plan.

1.8“Corporation” means Northern Trust Corporation, a Delaware corporation, and, to the extent provided in Section 8.8 below, any successor corporation or other entity resulting from a merger or consolidation into or with the Corporation or a transfer or sale of substantially all of the assets of the Corporation.

1.9“Deferred Compensation Account” means an individual bookkeeping account for each Participant established hereunder.

1.10“Early Retirement Age” means the Participant’s age upon the date the Participant has both attained at least age 55 and earned 15 or more years of “Credited Service” as defined under the Pension Plan, provided, however, that in the case of amounts credited to a Participant’s Deferred Compensation Account that are attributable to services performed prior to 2018, “Early Retirement Age” shall have the meaning assigned to it under the Plan as in effect prior to November 1, 2017.

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1.11“Effective Date” means January 1, 2024, for the amended and restated Plan. The original effective date of the Plan was May 1, 1998.

1.12“409A Amount” means the portion of the Deferred Compensation Account of a Participant that consists of amounts deferred in taxable years beginning after December 31, 2004, and earnings on such amounts, as determined in accordance with Code Section 409A and applicable regulations and other guidance promulgated thereunder. The portion, if any, of a Participant’s Deferred Compensation Account that consists of amounts deferred on or before December 31, 2004, and earnings on such amounts, is referred to herein as the Participant’s “Grandfathered Amount.” An amount is considered deferred on or before December 31, 2004, if on or before that date the Participant had a legally binding right to be paid the amount, and the right to the amount was earned and vested. “409A Amount attributable to services performed prior to 2018” means all amounts credited to a Participant’s Deferred Compensation Account that are attributable to services performed prior to 2018, excluding any Grandfathered Amounts.

1.13“Incentive Compensation” means cash compensation earned pursuant to the Incentive Compensation Plans.

1.14“Incentive Compensation Plans” means the Partners Incentive Plan, the Management Performance Plan and/or any other bonus program defined by the Company to be included.

1.15“Initial Plan Year” means the eight-consecutive-month period commencing on the original effective date and ending on December 31, 1998.

1.16“Investment Committee” means the Employee Benefit Investment Committee of the Company, as constituted from time to time, which has the investment responsibilities specifically assigned to it under Article IV.

1.17“Key Employee” means a Participant who is a “specified employee” within the meaning of Code Section 409A(a)(2)(B)(i). The Company’s Key Employees shall be identified annually pursuant to Section 5.7.

1.18“Normal Retirement Age” means age 65, provided that in the case of an individual who commences participation in the Pension Plan after his sixtieth (60th) birthday, the individual’s “Normal Retirement Age” shall mean his age on the earlier of (i) the fifth (5th) anniversary of the date the individual commenced participation in the Pension Plan, or (ii) the date the individual completes five (5) years of “Vesting Service,” as defined under the Pension Plan.

1.19“Participant” means an employee of the Company (a) who resides in the United States or is a United States expatriate on temporary foreign assignment, (b) who is eligible to participate in the Plan in accordance with Article II and (c) who has a Deferred Compensation Account under the Plan; provided, that the following shall not be considered Participants: (i) an employee employed by any office or branch of the Company located in a foreign country who, as to the United States, is a nonresident alien, and (ii) an employee who (A) as to the United States, is a foreign national, (B) is working for the Company at a location located in the United States, and (C) is covered by a retirement plan sponsored by a non-U.S. affiliate of the Corporation in the country in which that affiliate is located.

1.20“Pension Plan” means The Northern Trust Company Pension Plan, as amended from time to time.

1.21“Plan” means the Northern Trust Corporation Deferred Compensation Plan, as amended from time to time.

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1.22“Plan Year” means the calendar year.

1.23“Postponed Retirement Age” means the Participant’s age after Normal Retirement Age when such Participant incurs a Break in Service.

1.24“Related Company” means any person with whom the Company is considered to be a single employer under Section 414(b) of the Code and all persons with whom the Company would be considered a single employer under Code Section 414(c), substituting 50% for the 80% standard that would otherwise apply.

1.25“Retirement Deferral” means the category of deferral described in Section 5.1(a).

1.26“Retirement Date” means the date, if any, of the Participant’s Separation from Service after reaching the Participant’s Normal, Early or Postponed Retirement Age.

1.27“Retirement Distribution Date” means the last business day of the 12th month following the month in which the Participant’s Retirement Date occurs.

1.28“Separation from Service” means a Participant’s termination of employment with the Company for any reason other than death. A termination of employment will be deemed to occur when the Company and the Participant reasonably anticipate that the level of bona fide services the Participant will perform for the Company (whether as an employee or an independent contractor, but not as a director) after a certain date will permanently decrease to less than 50 percent of the average level of bona fide services performed by the Participant for the Company (as an employee or independent contractor, but not as a director) in the immediately preceding 36 months (or the full period of the Participant’s services to the Company if the Participant has been providing services to the Company for less than 36 months), determined in accordance with Treas. Reg. Sec. 1.409A-1(h). The employment relationship will be treated as continuing intact while the Participant is on a bona fide leave of absence (determined in accordance with Treas. Reg. Sec. 1.409A-1(h)), but (a) only if there is a reasonable expectation that the Participant will return to active employment status, and (b) only to the extent that such leave of absence does not exceed 6 months, or, if longer, for so long as the Participant has a statutory or contractual right to reemployment. For purposes of this Section 1.28, references to the Company shall include the Company and all Related Companies.

1.29Short-Term Deferral means the category of deferral described in Section 5.1(b).

1.30“Short-Term Distribution Date” means the last business day of January of any Plan Year as provided under Section 5.1 of the Plan and as irrevocably set forth in each of the Participant’s Short-Term Deferral election forms.

ARTICLE II
ELIGIBILITY

2.1Conditions for Deferrals for 1998 and 1999 Incentive Compensation Payments. For Incentive Compensation which otherwise would be paid during the 1998 or 1999 Plan Years, an employee of the Company who participates in an Incentive Compensation Plan and (i) whose Assigned Base Salary, determined as of April 1, 1998, is at least $100,000, or (ii) whose Assigned Base Salary determined as of April 1, 1998 plus Incentive Compensation paid under the Incentive Compensation Plans during the period commencing on April 1, 1997 and ending on March 31, 1998 is at least $150,000, shall be eligible to defer Incentive Compensation under the Plan.

2.2Conditions for Deferrals for 2000 through 2022. For Plan Years beginning after 1999 and prior to 2021, the Plan required that the Participant’s Assigned Base Salary or Assigned

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Based Salary plus Incentive Compensation meet certain dollar thresholds described in the Plan (or such other amount as the Committee determined). For Incentive Compensation attributable to services performed in the 2021 or 2021 Plan Years, an employee of the Company who participates in an Incentive Compensation Plan for each such year and whose Assigned Base Salary, determined as of November 15, 2020, was at least $200,000 was eligible to defer Incentive Compensation under the Plan for 2021. For Incentive Compensation attributable to services performed in the 2022 Plan Year, an employee of the Company who participates in an Incentive Compensation plan for such year and whose Assigned Base Salary, determined as of November 15, 2021 is at least $200,000 shall be eligible to defer Incentive Compensation under the Plan for 2022.

2.3Conditions for Deferrals in Subsequent Plan Years. For Incentive Compensation attributable to services performed in the 2023 Plan Year and each subsequent Plan Year, an employee of the Company who participates in an Incentive Compensation Plan for such year and whose Assigned Base Salary, determined as of November 15 immediately preceding such year, is at least equal to an amount as the Committee, or its delegate, shall from time to time determine, shall be eligible to defer Incentive Compensation under the Plan for such year.

ARTICLE III
DEFERRAL OPPORTUNITY

3.1Amount Which May Be Deferred. Each Participant may elect to defer all or a portion of his or her annual Incentive Compensation as determined by the Committee; provided, however, the amount of each deferral for each payment of Incentive Compensation shall be at least $2,500. Participants shall always be one hundred percent (100%) vested in the amount they defer.

3.2Deferral Election. Participants shall make the election to defer Incentive Compensation under the Plan on a Deferral Election Form within such dates as the Committee from time to time establishes; provided, that any such election must be made on or before December 31 of the Participant’s taxable year preceding the taxable year in which the Participant performs the services that give rise to the Incentive Compensation to be deferred. Participants shall make the following determinations on each Deferral Election Form, which determinations shall become irrevocable on December 31 of the Plan Year in which the election is made (or such earlier date in that Plan Year as the Committee may determine):

(a)the amount to be deferred with respect to the Participant’s Incentive Compensation to which the election applies pursuant to the terms of Sections 3.1 and 3.2 herein;

(b)with respect to the automatic Retirement Deferral election described in Section 5.1(a), the date as of which payments are to commence in accordance with Section 5.1(a) and the form in which such benefits are to be paid in accordance with Section 5.2, subject to the terms and conditions of Article V; and

(c)if the Participant is making an optional Short-Term Deferral election described in Section 5.1(b), the Short-Term Distribution Date on which such Short-Term Deferral is to be paid in accordance with and subject to the terms and conditions of Article V.

3.3Partial Year Employment and Initial Election. An employee who commences employment with the Company after the beginning of a Plan Year shall not be permitted to make an election to defer Incentive Compensation attributable to services performed in such Plan Year. Further, an employee who commences employment with the Company after November 15 of any Plan Year (or such other date as the Company may determine in its sole discretion) shall not be eligible under Sections 2.2 or 2.3 to defer Incentive Compensation attributable to services performed in the subsequent Plan Year.

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3.4Disability or Other Absence. Subject to Section 5.1(d), if the Participant experiences a disability, all previous Deferral Elections will remain in force unless the Committee, in its sole discretion, determines that the Participant has incurred an unforeseeable emergency pursuant to Section 5.3 of the Plan, in which case it will waive, upon the Participant’s request, such election(s). Subject to the foregoing, if the Participant takes a paid or unpaid leave of absence, all previous Deferral Elections will remain in full force.

ARTICLE IV
INVESTMENT OF DEFERRED INCENTIVE COMPENSATION

4.1Investment Options/Earnings Credited to Participant Accounts. The Deferred Compensation Account of each Participant shall be a notional account. All amounts credited to such accounts shall be bookkeeping entries only. The Investment Committee may permit Participants to select among certain investment alternatives designated by the Investment Committee, and amounts credited to Participant Deferred Compensation Accounts shall be treated as if they were invested in such investment alternatives and shall be credited with earnings based on the performance of such investment alternatives.

4.2A Participant may transfer amounts credited to the Participant’s Deferred Compensation Account among the investment alternatives specified by the Investment Committee in accordance with such rules and requirements as established by the Investment Committee on a uniform and nondiscriminatory basis. Transfers among investment alternatives shall generally be made effective on the business day following the business day a transfer election is filed, subject to the Investment Committee’s discretion to suspend transfers in the event of market disruption or such other factor that the Investment Committee deems relevant.

4.3Participant Statements. Statements that identify the Participant’s Deferred Compensation Account balance shall be provided, or made available, to Participants no less frequently than annually.

4.4Notwithstanding anything in the Plan to the contrary, for a period of two years after the date of an occurrence of a Change in Control, neither the Investment Committee, nor the Company or Corporation or any successor of any of the foregoing, shall eliminate any of the investment alternatives and elections that were in effect immediately prior to the Change in Control and shall not decrease the frequency with which Participants may change investment elections. Notwithstanding the foregoing, in the event that an investment alternative is discontinued by its sponsor and therefore becomes unavailable to Participants, the Investment Committee or its successor shall provide a substitute alternative with substantially similar investment objectives and policies.

4.5Valuation of Deferred Compensation Accounts.    Participants’ Deferred Compensation Accounts shall be valued as of each business day.

ARTICLE V
DISTRIBUTIONS AND LIMITS ON DISTRIBUTIONS

5.1Deferral Period. Pursuant to Section 3.2, each Participant shall irrevocably elect the Deferral Period for the Incentive Compensation payments deferred in any Plan Year, as described below:

(a)Automatic Retirement Deferral Election. Subject to Section 5.1(b), each Participant shall be deemed to irrevocably elect, with respect to the Incentive Compensation payments deferred in any Plan Year under Section 3.2, a Retirement Deferral, pursuant to which payments under the Plan shall commence, provided that the Participant incurs a Retirement Date and subject to Section 5.6, (i) either (A)

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within sixty (60) days of the Participant’s Retirement Date, or (B) on the Retirement Distribution Date, and (ii) in the form elected by the Participant in accordance with Section of the Plan, each as elected by the Participant in accordance with Section 3.2 (provided, however, that payments must commence in accordance with clause (i)(B) of this Section 5.1(a) if the Participant elects to receive payment in the form provided under Section 5.2(b)). Any election by the Participant to defer Incentive Compensation under Section 3.2 and this Section 5.1 shall not be effective unless the Participant completes the elections described in clauses (i) and (ii) of this Section 5.1(a).

(b)Optional Short-Term Deferral Election. In addition to the automatic Retirement Deferral election described in Section 5.1(a), each Participant may also irrevocably elect, with respect to the Incentive Compensation payments deferred in any Plan Year, a Short-Term Deferral, pursuant to which payments under the Plan shall commence only in the form provided under Section 5.2(a) of this Plan on any Short-Term Distribution Date elected by the Participant, provided that such Short-Term Distribution Date shall be no earlier than the Short-Term Distribution Date that is subsequent to three (3) Plan Years following the end of the Plan Year in which the Incentive Compensation would have otherwise been paid to the Participant1, and provided that such Short-Term Distribution Date occurs prior to the Participant’s Separation from Service. In all events, if a Participant’s Separation from Service occurs prior to the Participant’s Short-Term Distribution Date, the Participant’s Incentive Compensation will be distributed in accordance with Section 5.1(a) or Section 5.1(d), as applicable.

(c)Notwithstanding anything in the Plan to the contrary, Incentive Compensation paid after a Participant’s Retirement Date, other Separation from Service or death, is not eligible for deferral and will not be deferred, regardless of the Participant’s prior Deferral Election.

(d)Notwithstanding any Deferral Period(s) elected by a Participant pursuant to Section 3.2(b) or 3.2(c), as applicable, and this Section 5.1, and subject to Section 5.6, if a Participant has a Separation from Service prior to Early Retirement Age and prior to the Short-Term Distribution Date, if any, elected by the Participant in accordance with Section 5.1(b),

(i)such Participant shall be paid out of the Plan in one (1) lump sum in cash within sixty (60) days after such Separation from Service; or

(ii)(A) with respect to a Participant’s 409A Amount, if the Participant has been on disability leave for a period of six (6) months and the Participant does not retain a right to reemployment under an applicable statute or by contract, such Participant’s 409A Amount shall be paid out of the Plan in one (1) lump sum in cash within sixty (60) days after such six (6) month disability period has elapsed; and

(B) with respect to a Participant’s Grandfathered Amount, if any, if the Participant has been on disability leave for a period of twelve (12) months, such Participant’s Grandfathered Amount shall be paid out of the Plan in one (1) lump sum in cash within sixty (60) days after such twelve (12) month disability period has elapsed.

1 Example: Incentive Compensation earned with respect to services performed in 2018 would normally be paid in February of 2019. A Short Term Deferral with respect to this amount would have to be filed by December 31, 2017, and would have to defer receipt until the Distribution Date in February 2023 as that is the Distribution Date that is subsequent to the three Plan Year (2020, 2021 and 2022) following the Plan Year in which the Incentive Compensation would be paid

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For purposes of this Section 5.1(d), the amount distributed shall be an amount equal to the value of the Participant’s Deferred Compensation Account on the last business day of the month preceding the date of payment.

5.2Payment of Deferred Amounts. Subject to Section 5.6(d), payment of a Participant’s Deferred Compensation Account under the Plan shall be made in cash in one of the following forms irrevocably elected by the Participant pursuant to Sections 3.2(b) and 5.1:

(a)Lump Sum Payment. Payments shall be made in one (1) lump sum in an amount equal to the value of the Participant’s Deferred Compensation Account (i) in the case of payment pursuant to an election made under Sections 3.2(b) and 5.1(a)(i)(A), on the last business day of the month preceding the date of payment; (ii) in the case of payment pursuant to an election to commence payment under Sections 3.2(b) and 5.1(a)(i)(B) in the form of a lump sum, on the Retirement Distribution Date; and (iii) in the case of payment pursuant to an election made under Section 5.1(b) on the Short-Term Distribution Date.

(b)Installment Payments. Payments shall be made in either five (5) or ten (10) annual installments, as irrevocably elected by the Participant. Subject to Section 5.6, the initial payment shall be made on the Retirement Distribution Date. The remaining installment payments shall be made in the form of cash each year thereafter on the anniversary date of the Retirement Distribution Date (notwithstanding any delay of an initial payment due to the application of Section 5.6), until the Participant’s entire Deferred Compensation Account has been paid. The amount of each installment payment shall be equal to value of the Participant’s Deferred Compensation Account on the Retirement Distribution Date or anniversary date thereof. as applicable (or if that day is not a business day, then on the immediately preceding business day), multiplied by a fraction, the numerator of which is one (1), and the denominator of which is the number of installment payments remaining.

For purposes of this Plan, an amount shall be deemed distributed on the Short-Term Distribution Date, Retirement Distribution Date or the anniversary of a Retirement Distribution Date, as applicable, if it is distributed no later than the last day of the calendar year in which such applicable date occurs or, if later, by the 15th day of the third calendar month after such applicable date occurs, subject to and in accordance with the provisions of Treasury Regulation section 1.409A-3(d), including without limitation the requirement that the employee shall in no event have the right directly or indirectly to designate the taxable year of payment.

5.3Unforeseeable Emergency. The Committee shall have the sole authority to alter the timing or manner of payment of amounts from a Participant’s Deferred Compensation Account in the event that the Participant establishes, to the satisfaction of the Committee that the Participant has experienced an unforeseeable emergency, as defined in Treas. Reg. Sec. 1.409A-3(i)(3)(i). In such event, the Committee may, upon the request of the Participant:

(a)Provide that all or a portion of the amount previously deferred by the Participant immediately shall be paid to the Participant in a lump sum payment; or

(b)Provide that all or a portion of the installments payable over a period of time immediately shall be paid to the Participant in a lump sum payment.

However, the amount distributed pursuant to this Section 5.3 shall not exceed the amount that is reasonably necessary for the Participant to satisfy the emergency need at the time of distribution, as determined by the Committee in its sole discretion. In determining the amount reasonably necessary to satisfy a Participant’s emergency need, the Committee must take into account any additional compensation that is available to the Participant if the

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Committee has waived the Participant’s previous Deferral Elections upon the Participant’s request pursuant to Section 3.4.

The Committee shall determine whether the Participant has experienced an unforeseeable emergency based on the relevant facts and circumstances. An unforeseeable emergency will be deemed to exist in the event of an illness or accident of the Participant or the Participant’s dependent (as defined in Section 152(a) of the Code, without regard to Sections 152(b)(1), (b)(2) and (d)(1)(B)), loss of the Participant’s property due to casualty, or other similar unforeseeable and extraordinary circumstances arising as a result of events beyond the control of the Participant. The Committee’s decision with respect to whether the Participant has experienced an unforeseeable emergency and the manner in which, if at all, the payment of deferred amounts shall be altered or modified, shall be final, conclusive, and not subject to appeal.

Notwithstanding anything in this Section 5.3 to the contrary, no amounts may be distributed on account of this Section 5.3 if such unforeseeable emergency may be relieved:

(i)Through reimbursement or compensation by insurance or otherwise;

(ii)By liquidation of the Participant’s assets, to the extent the liquidation of such assets would not itself cause severe financial hardship; or

(iii)By cessation of deferrals under the Plan.

5.4Maximum Deductible Amount. An amount that would otherwise be paid from the Deferred Compensation Account of a Participant in a given Plan Year may be delayed to the extent that the Company reasonably anticipates that if the payment were made as scheduled the Company’s deduction with respect to such payment would not be permitted due to the application of Code Section 162(m). Subject to the first sentence of Section 5.5, amounts not paid as a result of the above limitation shall be paid in the earlier of (a) the Company’s first taxable year in which the Company reasonably anticipates that if the payment is made during such year the deduction of such payment will not be barred by application of Section 162(m), or (b) the period beginning with the date of the Participant’s Separation from Service or death, and ending on the later of (i) the last day of the taxable year of the Company in which the Participant incurs a Separation from Service or dies, or (ii) the 15th day of the third month following the Participant’s Separation from Service or death.

5.5Death of Participant. Effective as of September 1, 2023, a Participant, who at the time of his death is employed by the Company or any Related Company and who dies before a complete distribution of his Deferred Compensation Account has been made to him, or who has a Separation from Service and subsequently dies before a complete distribution of his Deferred Compensation Account has been paid to him, shall have his remaining Deferred Compensation Account distributed in cash in one (1) lump sum to his Beneficiary or Beneficiaries last designated by the Participant in a form and manner designated by the Committee or its delegate [writing delivered to the Committee ]prior to the Participant’s death, or otherwise determined under Section 1.2. Such distribution shall be made any time during the period beginning on the date of death and ending on December 31 of the first calendar year following the calendar year in which the Participant’s death occurs.

5.6Limits on Distributions to Key Employees. Anything in the Plan to the contrary notwithstanding, including without limitation Section 5.3, if a Participant is a Key Employee, any distribution of a 409A Amount to such Participant due to the Participant’s Separation from Service that would otherwise be made during the six months following such Separation from Service shall in no event be made earlier than the earlier of (i) the date that is six months and one day following such Separation from Service, or (ii) the Participant’s death.

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5.7Annual Identification of Key Employees. The Specified Employee Identification Date, as defined in Treas. Reg. Sec. 1.409A-1(i)(3), to be used in determining Key Employees of the Company shall be September 30 of any Plan Year. The January 1 of the Plan Year next following that Plan Year shall be the Specified Employee Effective Date, as defined in Treas. Reg. Sec. 1.409A-1(i)(4), for Participants identified as Key Employees on the immediately preceding Specified Employee Identification Date. Participants identified as Key Employees on a Specified Employee Identification Date (September 30) shall be treated as Key Employees under the Plan for the 12-month period beginning on the Specified Employee Effective Date (January 1) next following such Specified Employee Identification Date.

5.8Grandfathered Amount. Notwithstanding anything herein to the contrary, a Participant’s Grandfathered Amount, if any, shall be paid at the time and in the form determined under the Plan as in effect October 3, 2004.

5.9409A Amounts Attributable to Service Prior to 2018. Notwithstanding anything herein to the contrary, a Participant’s 409A amounts attributable to services performed prior to 2018 shall be paid at the time and in the form determined under the Plan as in effect prior to November 1, 2017, which are described in Supplement 2; provided, however that amounts payable on account of the death of Participant shall be paid in accordance with Section 5.5

ARTICLE VI
ADMINISTRATION OF THE PLAN

6.1Terms Include Authorized Delegates. Where appropriate, the terms “Company,” “Corporation,” “Committee” or “Investment Committee” as used in this Plan shall also include any applicable subcommittee or any duly authorized delegate of the Company, the Corporation, the Committee or the Investment Committee, as the case may be. Such duly authorized delegate may be an individual or an organization within the Company, the Corporation, the Committee or the Investment Committee, or may be an unrelated third party individual or organization.

6.2Authority of the Committees. The Committee shall administer the Plan and shall have full power to select employees for participation in the Plan and to determine the terms and conditions of each employee’s participation; to construe and interpret the Plan and any agreement or instrument entered into hereunder; and to establish, amend, or waive rules and regulations for the Plan’s administration. Further, the Committee shall have full power to make any other determination which may be necessary or advisable for the Plan’s administration. The Investment Committee shall have those powers set forth in Section 4.1 of the Plan.

6.3Decisions Binding. Subject to the provisions of Article VII, all determinations and decisions made by the Committee or the Investment Committee pursuant to the provisions of the Plan, and all related orders, resolutions or actions of the Board, the Human Capital and Compensation Committee of the Board, the Chief Executive Officer of the Corporation or the Executive Vice President and Chief Human Resources Officer of the Corporation (or the duly authorized designee of either of the latter two individuals) shall be final, conclusive, and binding on all persons, including the Company, its stockholders, employees, Participants, and their estates and beneficiaries.

ARTICLE VII
AMENDMENT OR TERMINATION

7.1Amendment or Termination. The Corporation has set no termination date for the Plan but reserves the right to amend or terminate the Plan when, in the sole discretion of the Corporation, such amendment or termination is advisable.

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(a)Any such termination shall be made by action of the Human Capital and Compensation Committee of the Board (or by action of the Board if the Human Capital and Compensation Committee is unavailable or unable to act for any reason) and shall be effective as of the date set forth in such resolution.

(b)Any such amendment shall be made in accordance with the following:

(i)material amendments to the Plan shall be made by action of the Human Capital and Compensation Committee of the Board (or by action of the Board, if the Human Capital and Compensation Committee is unavailable or unable to act for any reason); and

(ii)(A) non-material or administrative amendments to the Plan or (B) any amendment to the Plan deemed required, authorized or desirable under applicable statutes, regulations or rulings, shall be made by action of either the Chief Executive Officer of the Corporation or the Executive Vice President and Chief Human Resources Officer of the Corporation (or either of their duly authorized designees).

7.2Effect of Amendment or Termination. No amendment or termination of the Plan shall directly or indirectly reduce the balance of any deferred compensation held hereunder as of the effective date of such amendment or termination. Upon termination of the Plan, distribution of amounts in a Participant’s Deferred Compensation Account shall be made to him or his Beneficiary in the manner and at the time described in Article V of the Plan. No additional credits shall be made to the Deferred Compensation Account of a Participant for any Plan Year beginning after the termination of the Plan, but the Company shall continue to credit gains and losses attributable to investments made pursuant to Section 4.1 to such Deferred Compensation Account until the balance of such Account has been fully distributed to the Participant or his Beneficiary.

7.3Amendments Necessary to Satisfy Code Section 409A. Anything in the preceding Sections 7.1 or 7.2 or elsewhere in the Plan to the contrary notwithstanding:

(a)the Plan may be amended in any manner necessary to ensure that the Plan complies in all applicable respects with Code Section 409A; and

(b)the Plan may not be amended in any manner that would cause the Plan to fail to comply in any applicable respect with Code Section 409A.

ARTICLE VIII
GENERAL PROVISIONS

8.1Plan Unfunded/Participant’s Rights Unsecured. The Plan at all times shall be entirely unfunded and no provision shall at any time be made with respect to segregating any assets of the Company for payment of any benefits hereunder. The Company shall contribute assets to a rabbi trust described in Revenue Procedure 92-64 (the “Trust”) for the purpose of paying benefits under this Plan, and if and to the extent that the Company does so, benefits under the Plan shall be payable pursuant to and in accordance with the Trust Agreement, which shall in all events provide that all assets held thereunder remain subject to the claims of the general creditors of the Company. No Participant, Beneficiary or any other person shall have any interest in any particular assets of the Company or the Trust by reason of the right to receive a benefit under the Plan and any such Participant, Beneficiary or other person shall have only the rights of a general unsecured creditor of the Company with respect to any rights under the Plan and Trust Agreement.

8.2Tax Withholding.

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(a)In connection with any deferral under the Plan, the Company shall have the right, at the time of deferral, to withhold an amount sufficient to satisfy the FICA tax withholding requirements applicable to such deferrals, and the income tax at source on wages impose under Code Section 3401 of the corresponding withholding provisions of applicable state, local or foreign tax laws as a result of the payment of the FICA tax, and to pay the additional income tax at source on wages attributable to the pyramiding Code Section 3401 wages and taxes. The total payment under this Section 8.2(a) must not exceed the aggregate of the FICA amount, and the income tax withholding related to such FICA amount.

(b)In the alternative, in connection with any deferral under the Plan, the Company may withhold from the nondeferred portion of a Participant’s Incentive Compensation, or from other compensation available at the time of the deferral, an amount sufficient to satisfy the FICA tax withholding requirements applicable to such deferral, or may require the Participant to remit to the Company an amount sufficient to satisfy the tax obligation

(c)In no event shall any Participant have the right to designate whether Section 8.2(a) or 8.2(b) shall apply.

(d)In connection with any distribution to the Participant of deferred Incentive Compensation, the Company shall have the right to withhold from such distribution an amount sufficient to satisfy Federal, State, and local tax withholding requirements applicable to such distributions.

8.3No Guaranty of Benefits. Nothing contained in the Plan shall constitute a guaranty by the Company or any other person or entity that the assets of the Company will be sufficient to pay any benefit hereunder.

8.4No Enlargement of Employee Rights. No Participant shall have any right to receive a distribution of contributions made under the Plan except in accordance with the terms of the Plan. Establishment of the Plan shall not be construed to give any Participant the right to be retained in the service of the Company.

8.5Spendthrift Provision. No interest of any person or entity in, or right to receive a distribution under, the Plan shall be subject in any manner to sale, transfer, assignment, pledge, attachment, garnishment, or other alienation or encumbrance of any kind; nor may such interest or right to receive a distribution be taken, either voluntarily or involuntarily, for the satisfaction of the debts of, or other obligations or claims against, such person or entity, including claims for alimony, support, separate maintenance and claims in bankruptcy proceedings.

8.6Applicable Law. To the extent not preempted by Federal law, the Plan shall be construed and administered under the laws of the State of Illinois.

8.7Incompetency. Every person receiving or claiming benefits under the Plan shall be presumed to be mentally competent and of age until the Committee receives a written notice, in a form and manner acceptable to it, that such person is incompetent or a minor, and that a guardian, conservator, or other person legally vested with the care of his estate has been appointed. In the event that the Committee finds that any person to whom a benefit is payable under the Plan is unable to properly care for their affairs, or is a minor, then any payment due (unless a prior claim therefor shall have been made by a duly appointed legal representative) may be paid to the Spouse, a child, a parent, or a brother or sister, or to any person deemed by the Committee to be authorized to care for such person otherwise entitled to payment.

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In the event a guardian, executor, administrator, or conservator of the estate of any person receiving or claiming benefits under the Plan shall be appointed by a court of competent jurisdiction, payments shall be made to such guardian, executor, administrator, or conservator provided that proper proof of appointment is furnished in a form and manner suitable to the Committee. Any payment made under the provisions of this Section 8.7 shall be a complete discharge of any liability therefor under the Plan.

8.8Successors. The Plan shall not be automatically terminated by a transfer or sale of assets of the Corporation or by the merger or consolidation of the Corporation into or with any other corporation or other entity, but the Plan shall be continued after such sale, merger or consolidation only if and to the extent that the transferee, purchaser or successor entity agrees to continue the Plan. In the event that the Plan is not continued by the transferee, purchaser or successor entity, then the Plan shall terminate subject to the provisions of Section 7.2.

8.9Unclaimed Benefit. Each Participant shall keep the Committee informed of his current address and the current address of his designated Beneficiary. None of the Corporation, the Company or the Committee shall be obligated to search for the whereabouts of any person. If the Committee is unable to locate the Participant or any Beneficiary of the Participant, then none of the Corporation, the Company or the Plan shall have any further obligation to pay any benefit hereunder to such Participant or Beneficiary and such benefit shall be forfeited; provided, however, that if the Participant or Beneficiary makes a valid claim for any benefit that has been forfeited, the forfeited benefit shall be reinstated.

8.10Electronic or Telephonic Notices. Any election, notice, direction or other such action required or permitted to be made in writing under the Plan may also be made electronically, telephonically or otherwise, to the extent then permitted by applicable law and the administrative rules prescribed by the Committee.

8.11Limitations on Liability. Notwithstanding any of the preceding provisions of the Plan, neither the Company, any member of the Committee or the Investment Committee nor any individual acting as an employee or agent of the Company, the Committee or the Investment Committee shall be liable to any Participant, former Participant, Beneficiary or any other person for any claim, loss, liability or expense incurred in connection with the Plan.

8.12Gender; Headings. Words in the masculine gender shall include the feminine and the singular shall include the plural, and vice versa, unless qualified by the context. Any headings used herein are included for ease of reference only, and are not to be construed so as to alter the terms hereof.

8.13Compliance with Code Section 409A. The Plan is intended to comply in all applicable respects with the requirements of Code Section 409A and shall be construed and administered so as to comply with that Code section.

IN WITNESS WHEREOF, Northern Trust Corporation has caused this amendment and restatement of the Plan to be executed on its behalf by its duly authorized officer this 17 day of July, 2023, effective as of January 1, 2024 (or as of such other dates as are noted herein).

NORTHERN TRUST CORPORATION

    /s/ Alex Taylor

By:    Alex Taylor

Title:    Executive Vice President
Chief Human Resources Officer

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SUPPLEMENT #1

Special 2005 Deferral Election Cancellations

This Supplement #1 to the Northern Trust Corporation Deferred Compensation Plan, as amended and restated effective October 18, 2021 (the “Plan”), is made a part of the Plan and supersedes any provisions thereof to the extent that they are not consistent with this Supplement. Unless the context clearly implies or indicates to the contrary, a word, term or phrase used or defined in the Plan is similarly used or defined for purposes of this Supplement #1.

1.Effective Date. January 1, 2005.

2.Application. This Supplement #1 shall apply to:

(a)Any Participant who, prior to February 28, 2005, requested the cancellation of the Participant’s previous election to defer all or a portion of the cash award payment of Incentive Compensation scheduled to be made to the Participant on February 28, 2005;

(b)Any Participant who previously elected to defer all or a portion of the cash award payment of Incentive Compensation scheduled to be made to the Participant in the Plan Year beginning January 1, 2005 (the “2005 Plan Year”) and whose 2005 Plan Year payment schedule for such Incentive Compensation was changed from annual to quarterly after such deferral election had been made;

(individually, a “Special Election Cancellation Participant” and, collectively, the “Special Election Cancellation Participants”); and

(c)Any Participant who would be considered a “specified employee” as defined in proposed regulation section 1.409A-1(i) issued by the U.S. Treasury Department and the Internal Revenue Service; who terminates employment for any reason on or after the Effective Date of this Supplement #1 and on or before October 31, 2005 (individually, a “2005 Specified Employee Participant” and, collectively, the “2005 Specified Employee Participants”).

3.Special Provision. The following special provision shall apply to the Special Election Cancellation Participants:

Special 2005 Deferral Election Cancellation: Pursuant to and in accordance with Notice 2005-1 and proposed regulations under Code section 409A issued by the

U.S. Treasury Department and the Internal Revenue Service, each Special Election Cancellation Participant shall have the opportunity to cancel a previous election to defer all or a portion of the cash award payment of Incentive Compensation for the 2005 Plan Year described in Paragraph 2(a) or (b) above, by executing and delivering to the Company a cancellation of the Participant’s previous election to defer, in the form prescribed by the Company, subject to the requirements specified in paragraphs 4 and 6 below. Any amount the deferral of which is cancelled in accordance with this Paragraph 3 shall be distributed no later than December 31, 2005, or the date such amount becomes vested, if later.

4.Special Election Deadline. To be effective, the election cancellation referred to in Paragraph 3 above must be executed and delivered to the Company by the Special Election

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Cancellation Participant on or before the date specified by the Company that is after the Effective Date of this Supplement #1, but no later than December 1, 2005.

5.Special Provision. The following special provision will apply to the 2005 Specified Employee Participants:

Special 2005 Termination of Participation: Pursuant to and in accordance with Notice 2005-1 and proposed regulations under Code section 409A issued by the U.S. Treasury Department and the Internal Revenue Service, each 2005 Specified Employee Participant shall be considered to have terminated participation in the Plan with respect to any amounts that would otherwise be subject to Code section 409A, effective as of the date such 2005 Specified Employee Participant terminated employment with the Company. Anything in the Plan to the contrary notwithstanding, such amounts shall be distributed in a lump sum distribution to such 2005 Specified Employee Participant no later than December 31, 2005, or the date such amounts become vested, if later.

6.Limitations on Supplement. Nothing in this Supplement #1 shall be construed to provide any Special Election Cancellation Participant or 2005 Specified Employee Participant with any rights or benefits under the Plan other than those described in Paragraphs 3 through 5, as applicable, above.

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SUPPLEMENT #2

Summary of Distribution Provisions

Applicable to a Participant’s 409A Amount attributable to services prior to 2018

The following summarizes and in some cases reproduces the principal provisions applicable to the payment of a Participant’s 409A Amount attributable to services performed prior to 2018, if any. To the extent that there is any conflict between this summary and the terms of the Plan as in effect prior to November 1, 2017, the pre-November 1, 2017 terms of the Plan control.

References in the provisions below to a Participant’s “409Amount” refer to the Participant’s 409A Amount attributable to services performed prior to 2018.

1.“Distribution Date” was defined under the pre-November 1, 2017 Plan as the last business day of February of any Plan Year as provided under Section 5.1 of the Plan and as irrevocably set forth in each of the Participant’s Deferral Election forms.

2.Deferral Election. Section 3.2 of the Plan provided that Participants “shall make the election to defer Incentive Compensation under the Plan on a Deferral Election Form by such dates as the Committee from time to time establishes; provided, that any such election must be made on or before December 31 of the Participant’s taxable year preceding the taxable year in which the Participant performs the services that give rise to the Incentive Compensation to be deferred. Participants shall make the following determinations on each Deferral Election Form, which determinations shall become irrevocable on December 31 of the Plan Year in which the election is made (or such earlier date in that Plan Year as the Committee may determine):

(a)The amount to be deferred with respect to the Participant’s Incentive Compensation paid during the Plan Year for which the election applies, pursuant to the terms of Section 3.1 herein;

(b)The deferral period after which payments of deferred amounts commence (the “Deferral Period”), pursuant to the terms of Section 5.1 herein; and

(c)The form of the payment of the deferred amount, pursuant to the terms of Section 5.2 herein.

3.Article V described the payment provisions applicable to Retirement Deferrals and Short- Term Deferrals. Under the pre-November 1, 2017 Plan, Retirement Deferrals were not automatic. Sections 5.1 and 5.2 provided:

“5.1 Deferral Period. Pursuant to Section 3.2, each Participant shall irrevocably elect the Deferral Period for the Incentive Compensation payments deferred in any Plan Year; provided that the Deferral Period elected by a Participant shall be either a Short-Term Deferral (as provided under Section 5.1(a)) or a Retirement Deferral (as provided under Section 5.1(b)).

(a)If the Participant elects a Short-Term Deferral, payments under the Plan shall commence only in the form provided under Section 5.2(a) of this Plan on any Distribution Date elected by the Participant; provided that such Distribution Date shall be no earlier than the Distribution Date that is subsequent to three (3) Plan Years following the end of the Plan Year in which the Incentive Compensation would have otherwise been paid to the Participant.

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(b)Subject to Section 5.6, if the Participant elects a Retirement Deferral, payments under the Plan shall commence following the Participant’s Separation from Service after reaching the Participant’s Normal, Early or Postponed Retirement date, as such dates are defined in the Pension Plan (such Separation from Service in those circumstances referred to as a “Retirement Date”), provided that payments under the Plan shall commence, as elected by the Participant in accordance with Section 3.2, either (i) within sixty (60) days of the Participant’s Retirement Date or (ii) on the Distribution Date immediately following the Plan Year in which the Participant’s Retirement Date occurs (provided that payments must commence under (ii) if the Participant elects to receive the payments in the form provided under Section 5.2(b) of the Plan).

(c)Notwithstanding anything in the Plan to the contrary, Incentive Compensation paid after a Participant’s Retirement Date or other Separation from Service is not eligible for deferral and will not be deferred, regardless of the Participant’s prior Deferral Election.

(d)Notwithstanding any Deferral Period(s) elected by a Participant pursuant to Section 3.2(b) and this Section 5.1, and subject to Section 5.6, if at any time before the end of the elected Deferral Period,

(i)a Participant incurs a Separation from Service, such Participant shall be paid out of the Plan in one (1) lump sum in cash within sixty (60) days after such Separation from Service; or

(ii)(A) with respect to a Participant’s 409A Amount, the Participant has been on disability leave for a period of six (6) months, such Participant’s 409A Amount shall be paid out of the Plan in one (1) lump sum in cash within sixty (60) days after such six (6) month disability period; and

(B) with respect to the Participant’s Grandfathered Amount, if any, the Participant has been on disability leave for a period of twelve (12) months, such Participant’s Grandfathered Amount shall be paid out of the Plan in one (1) lump sum in cash within sixty (60) days after such twelve (12) month disability period.

5.2 Payment of Deferred Amounts. Payment of a Participant’s Deferred Compensation Account under the Plan shall be made in cash in one of the following forms irrevocably elected by the Participant pursuant to Sections 3.2(b) and 5.1:

(a)Lump Sum Payment. Payments will be made in one (1) lump sum.

(b)Installment Payments. Payments will be made in either five (5) or ten (10) annual installments, as irrevocably elected by the Participant. Subject to Section 5.6, the initial payment shall be made on the Distribution Date following the Participant’s Retirement Date. The remaining installment payments shall be made in the form of cash each year thereafter (on each anniversary date of the initial payment), until the Participant’s entire Deferred Compensation Account has been paid. The amount of each installment payment shall be equal to the value of the Participant’s Deferred Compensation Account on the last business day of January immediately prior to each such payment, multiplied by a fraction, the numerator of which is one (1), and the denominator of which is the number of installment payments remaining.

All benefits hereunder shall be paid from the Trust, as further described in Article IV.”

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EX-10.16

Exhibit 10.16

Northern Partners Incentive Plan

(As amended and restated on January 16, 2024)

I. INTRODUCTION

1.1    Purpose. The purpose of the Northern Partners Incentive Plan (“NPIP” and collectively with any Sub-Plans, the “Plan”) is to (i) promote the achievement of superior financial and operating performance of Northern Trust Corporation and its subsidiaries (hereinafter referred to as “Northern Trust”), and (ii) further the objective of delivering unrivaled service quality to its clients and partners through the awarding of incentive payments to selected employees.

1.2    Definitions.

“Authorized Senior Manager” shall mean the officer or officers of Northern Trust who have been designated by the Committee to administer certain elements of the Plan, as specified herein.

“Board” shall mean the Board of Directors of the Corporation.

“Cause” shall mean (i) a material breach or Participant’s willful and substantial non-performance of Participant’s assigned duties and responsibilities (other than as a result of incapacity due to physical or mental illness), (ii) a conviction of or no contest plea with respect to bribery, extortion, embezzlement, fraud, grand larceny, or any felony or similar conviction under local law involving abuse or misuse of Participant’s position to seek or obtain an illegal or personal gain at the expense of the Corporation, Participant’s Employer or any of their respective subsidiaries, or similar crimes, or conspiracy to commit any such crimes or attempt to commit any such crimes, (iii) Participant’s violation of any policy of the Corporation, Participant’s Employer or any of their respective subsidiaries to which Participant may be subject or Participant’s willful engagement in any misconduct in the performance of Participant’s duties that materially injures the Corporation, Participant’s Employer or any of their respective subsidiaries, (iv) Participant’s performance of any act which, if known to the customers, clients, stockholders or regulators of the Corporation, Participant’s Employer or any of their respective subsidiaries, would materially and adversely impact the business of the Corporation, Participant’s Employer or any of their respective subsidiaries, or (v) any act or omission by Participant that causes a regulatory body with jurisdiction over the Corporation, Participant’s Employer or any of their respective subsidiaries, to demand, request, or recommend that Participant be suspended or removed from any position in which Participant serves with the Corporation, Participant’s Employer or any of their respective subsidiaries.

“Code” shall mean the Internal Revenue Code of 1986, as amended.

“Committee” shall mean the Human Capital and Compensation Committee of the Board, or a subcommittee thereof, or such other committee designated by the Board to administer the Plan.

“Continuous Years of Service” shall mean the period of Participant’s continuous and uninterrupted employment with Participant’s Employer commencing on Participant’s most recent hire date with Participant’s Employer through Participant’s termination date. For the sake of clarity, if Participant’s employment with Northern Trust terminated and Participant has been rehired by Participant’s Employer, Participant’s Continuous Years of Service shall not be determined by aggregating Participant’s periods of employment with Northern Trust. For purposes of this definition, the Participant’s termination date shall be deemed to occur on the

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effective date of the termination of employment with Participant’s Employer, as determined by the Participant’s Employer (in its discretion).

“Corporation” shall mean the Northern Trust Corporation, a Delaware corporation.

“Disability” shall mean (i) for a United States-based Participant, the Participant is eligible for and receives short-term and/or long-term disability benefits for 12 consecutive months under the Northern Trust sponsored disability program applicable to such Participant and (ii) for a Participant based outside of the United States, as determined by the Human Resources Officer (or his or her delegate) based on formal local country-specific definitions and eligibility criteria for disability benefits.

“Employer” shall mean the Corporation or any subsidiary that employs Participant.

“Exchange Act” shall mean the Securities Exchange Act of 1934, as amended.

“Good Standing” shall mean (i) the Participant has satisfactorily met performance expectations, including risk management components, as determined by the Participant's direct supervisor, (ii) the Participant has complied with all Northern Trust policies and standards of conduct, (iii) the Participant has not engaged in any activity competitive with Northern Trust’s business or otherwise detrimental to Northern Trust’s business, and (iv) the Participant has not tendered his or her resignation or been notified by Northern Trust of the termination of such Participant’s employment. Notwithstanding the forgoing, a Participant who has been notified of his or her involuntary termination due to job elimination or redundancy shall be considered in Good Standing.

“Human Resources Officer”shall mean the senior most human resources officer of the Corporation.

“Participant” shall mean any employee of Northern Trust selected to participate in the Plan for a Performance Period.

“Performance Period” shall mean any period designated by the Authorized Senior Manager during which incentives (under NPIP or any of its Sub-Plans) may be determined and which may represent a quarterly, semi-annual or annual period, depending on the incentive category to which the Participant is assigned and the potential award structure. Performance Periods for (i) quarterly payments shall be as follows: January 1 to March 31; April 1 to June 30; July 1 to September 30; and October 1 to December 31; (ii) semi-annual payments shall be as follows: January 1 to June 30 and July 1 to December 31; and (iii) all other awards under the Plan, shall be the Plan Year, unless otherwise approved by the Human Resources Officer (or his or her delegate).

“Plan Year” shall mean the calendar year period from January 1 to December 31.

“Retirement” shall mean a termination of employment without Cause occurring on or after the date (i) Participant has attained age 55, and (ii) the sum of Participant’s age (in whole years, rounded down to the nearest year) and Continuous Years of Service (in whole years, rounded down to the nearest year) equals or exceeds 65.

“Settlement Date” shall mean (i) except as provided in subsection (ii) below, the date on which any cash award is paid, (ii) for purposes of Section 3.4(c) and Local Addendum: Canada and solely for any cash award paid, the February 1st of the year following the Performance Period or

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(iii) the grant date, as approved by the Committee (or its delegate), of any equity-based compensation with respect to this Plan.

“Sub-Plan” shall mean specific incentive plan designs related to certain employee groups.

II. ELIGIBILITY

Participants in the Plan for a Plan Year are those employees designated by the Authorized Senior Manager as eligible to participate in the Plan. Employees who have a change in job duties, are promoted, or are hired during the applicable Performance Period may be considered for inclusion and designated by Business Unit Management for partial Plan Year participation. The Committee shall determine eligibility for the Human Resources Officer and any “executive officer” of Northern Trust, within the meaning of Section 16 of the Exchange Act.

III. TERMS OF AWARDS

3.1    Award Opportunities. Participants have an opportunity to participate in the Plan and receive an incentive each performance period, subject to corporate, business unit and individual performance, and any other factors that Northern Trust may determine appropriate.

3.2    Discretion. The award and payment of any incentive amount is at the sole and absolute discretion of Northern Trust. Northern Trust has the discretion not to award Participants an incentive payout or to reduce the amount of the incentive payout if either corporate, business unit or individual performance is not in line with expectations or due to any other reason Northern Trust deems appropriate in its sole and absolute discretion. This may mean that, regardless of corporate, business unit and individual performance, Northern Trust shall have the sole and absolute discretion to reduce the amount of any payment with respect to any award that would otherwise be made to any Participant or to decide that no payment shall be made.

3.3    Plan Incentive Pool. At the beginning of each Plan Year, (i) Northern Trust, in consultation with the Committee, shall determine projected funding for awards under the Plan and (ii) Business Unit Management shall determine appropriate targets, performance standards, and projected funding for awards to Participants in their respective Sub-Plans. Authorized Senior Managers shall have the right to either increase or decrease the original projected funding amount for the Plan due to actual results and each business unit’s relative contribution to actual results, effective risk management, or for any other reason as such Authorized Senior Managers deem fit in their sole and absolute discretion. Updates on projected funding shall be provided to the Committee on a quarterly basis. Where funding is reduced in respect of corporate or business unit amounts, this may result in no incentive payout, regardless of individual performance or any other factors. In addition, the funding amount may be further reduced after the end of the applicable Performance Period.

3.4    Individual Performance Measures, Award Determinations and Eligibility for Payment.

a.Individual Performance Measures. Each Participant shall receive performance expectations, including risk management components, for the Plan Year that shall consist of both objective goals and subjective performance assessments. Each Participant’s manager shall establish the Participant’s performance expectations, including risk management components, as early in the applicable Performance Period as practicable.

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b.Individual Award Determinations. All awards (if any) shall be impacted by available Plan funding, as determined and adjusted by Northern Trust, in its sole and absolute discretion. Awards (if any) shall be determined by Business Unit Management after the end of the applicable Performance Period, based upon an assessment of individual performance during the applicable Performance Period, taking into consideration: (i) individual performance expectations, including risk management components; (ii) overall contributions to corporate and business unit earnings, relative to peers; and (iii) competitiveness of a Participant’s total compensation. Both quantitative and qualitative performance criteria will be used to evaluate performance and formula-driven performance measures may be one of several factors for determination of award amounts. Northern Trust has the full and absolute discretion both during and after the Performance Period through the actual Settlement Date, not to make an award or to adjust all awards up or down based on a subjective performance evaluation, funding considerations, and any other factors which Northern Trust, in its sole and absolute discretion, determines appropriate. In addition to the foregoing, all awards must also comply with applicable regulatory requirements and may be risk-adjusted within Northern Trust's discretion for all individual employees or groups of employees who, individually or collectively, may expose Northern Trust to more substantial amounts of risk.

c.Conditions on Eligibility for Payment of Award. In order for a Participant to remain eligible for payment of an award, the Participant must continue employment in Good Standing with the business unit that designated him or her as a Participant, and contribute toward the achievement of corporate and business unit goals through the Settlement Date, except as otherwise required to comply with applicable local law; provided, however, a Participant who was designated by a business unit for participation and transfers to another business unit during the applicable Performance Period may, as determined by Business Unit Management of the transferring business unit in its sole discretion, be determined eligible for a pro-rata portion of the award based on service performed for the transferring business unit during the applicable Performance Period, provided that the corporate and business unit goals and individual performance expectations, and any other factors which Northern Trust may determine applicable, are achieved. Notwithstanding the foregoing, Business Unit Management may, in its sole and absolute discretion, determine that a pro-rata award shall be paid in the event of termination of employment with Northern Trust by a Participant on account of death, Disability, or Retirement, taking into consideration the portion of the Performance Period during which Participant was employed, the individual performance of the Participant during such portion of the Performance Period, and the availability of corporate, business unit and individual performance measurements as of the date of termination and any other factors as Northern Trust may from time to time take into account. Except as determined in Northern Trust’s sole discretion, a Participant who terminates employment by resigning (other than due to Retirement) before the Settlement Date or whose employment is terminated involuntarily (including due to job elimination or redundancy) or for Cause by Northern Trust shall not be entitled to any award or prorated award under this Plan.

3.5    Payment of Awards. After the end of the Performance Period, Northern Trust shall make recommendations with respect to the final funding amount for such Performance Period, and whether each Participant’s award shall be settled in cash, a grant of equity-based compensation under the Corporation’s equity plan then in effect, or a combination thereof. Such equity-based recommendations (including the terms and conditions of each equity grant, which may include, but are not limited to, a vesting schedule and possible forfeiture upon the occurrence of specified events (such as termination of employment, regulatory events, risk-based events or behaviors, or changes in business conditions)), shall be subject to the review and approval of the Committee,

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and no grant of any equity awards shall occur until the date of Committee approval. A Participant is not eligible to receive an award for the same performance period (or any partial performance period) under both NPIP and any Sub-Plan. Notwithstanding anything herein to the contrary, until the Settlement Date of the award, Northern Trust may in its absolute and sole discretion reduce or eliminate any award. It is intended that all cash-settled awards made under the Plan shall constitute short-term deferrals for purposes of Section 409A of the Code, and shall be paid by March 15th following the year in which the Participant’s substantial risk of forfeiture lapses and that all other awards hereunder shall constitute short-term deferrals for purposes of Section 409A of the Code or comply with Section 409A of the Code and the regulations thereunder, and all provisions of this Plan shall be interpreted in all events in a manner consistent with such intent.

IV. ADMINISTRATION

4.1    General. The Plan shall be administered by the Corporation’s Human Resources Officer and the Compensation Division of the Corporation’s Human Resources Department, subject to the powers and responsibilities delegated pursuant to Sections 4.3 and 4.4 of this Plan; provided, however, that the Plan, including, for the avoidance of doubt, the provisions of Article 3, shall be administered by the Committee with respect to the Human Resources Officer and any “executive officer” of Northern Trust, within the meaning of Section 16 of the Exchange Act. Subject to the provisions of the Plan, the Human Resources Officer shall be authorized to interpret the Plan, to establish, amend, and rescind rules and regulations relating to the administration of the Plan, and to make all other determinations necessary or advisable for the administration of the Plan. The determination of the Human Resources Officer in the administration of the Plan, as described herein, shall, upon consultation with members of the Management Group, be final and conclusive. The Authorized Senior Manager shall be responsible for final approval of all awards to be paid under the Plan, subject to any necessary Committee or Board approval required by applicable law or as specified herein.

4.2    Administrator Powers and Responsibilities. The Human Resources Officer and the Compensation Division of the Corporation’s Human Resources Department shall have the following discretionary powers and responsibilities in addition to those described in Section 4.1:

a.Guide incentive award calculations and determinations;

b.Review and monitor financial accruals in conjunction with the Corporation’s Controller’s Department; provided, that all awards may be subject to review and approval by the Corporation’s Accounting Department and final review and approval by the Authorized Senior Manager, prior to any award distribution;

d.Prepare any communications for Participants;

e.Participate in a yearly review of all compensation plans and arrangements to evaluate whether the designs might encourage imprudent risk-taking;

f.Participate in a yearly assessment of the full range of inherent risks in order to identify those partners whose responsibilities might lead to imprudent risk-taking; and

g.Direct the processing of approved incentive awards.

4.3    Business Unit Management Powers and Responsibilities. Business Unit Management shall have the following discretionary powers and responsibilities:

a.Prepare and communicate individual performance expectations;

b.Determine and recommend awards for approval by the president or functional head of the applicable business unit; and

c.Communicate award decisions to Participants.

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4.4    Risk Management Powers and Responsibilities. The Corporation’s Risk Management Department shall have the following discretionary powers and responsibilities:

a.Participate in a yearly review of all compensation plans to evaluate whether the designs might encourage imprudent risk-taking;

b.Undertake a yearly assessment of the full range of inherent risks in order to identify those partners whose responsibilities might lead to imprudent risk-taking; and

c.Participate in the design of any addendum to this Plan and any other new or revised sub-plans and addenda to assess the Plan’s effectiveness in risk modification.

V. GENERAL

5.1    Effective Date and Term of Plan. The Plan shall be effective upon its adoption by the Committee and shall continue until such time as it is terminated by the Committee or the Board. The Corporation reserves the right to suspend or terminate the Plan or to amend any or all of the provisions of the Plan, at any time, including during a Performance Period and without prior notice to Participants. The Committee may amend or modify the Plan at any time; provided, however, that the Human Resources Officer (or his or her delegate) shall have the authority to make non-material amendments or modifications to the Plan, including amendments or modifications to implement the intent of the Plan, or amendments or modifications deemed required, authorized or desirable under applicable statutes, regulations or rulings without the approval of the Committee.

5.2    No Right of Participation or Employment or Contractual Rights. No person shall have any right to participate in the Plan or to be granted an award opportunity under the Plan and designation for participation in this Plan for one Plan Year or a portion thereof does not establish eligibility for participation in any subsequent Plan Year or for any form of incentive or bonus compensation with respect to any subsequent period. Neither the Plan nor any award granted hereunder shall confer upon any person any right to be employed, reemployed or continue employment by Northern Trust or affect in any manner the right of Northern Trust to terminate the employment of any person with or without notice at any time for any reason without liability hereunder. Nothing herein shall confer any right or benefit or any entitlement to any benefit on any Participant unless and until a benefit is actually paid pursuant to the Plan. The adoption and maintenance of the Plan shall not be deemed to constitute a contract of employment between Northern Trust and any Participant, or to be a consideration for or an inducement or condition of any employment. Neither the Plan nor any action taken hereunder shall be construed as creating a contract or any contractually enforceable rights to any employee, retiree, former employee, or other person. The Plan is entirely discretionary in nature, with any incentive payments made only at Northern Trust’s sole and absolute discretion. Neither the provisions of the Plan nor any action taken by Northern Trust, Business Unit Management, the Human Resources Officer, the Authorized Senior Manager, the Board or the Committee pursuant to the provisions of the Plan shall be deemed to create any trust, express or implied, or any fiduciary relationship between or among Northern Trust, Business Unit Management, the Human Resources Officer, the Authorized Senior Manager, the Board, the Committee, or any employee, former employee or beneficiary thereof.

5.3    No Waiver. No failure by Northern Trust at any time to give notice of any breach by the Participant, or to require compliance with, any condition or provision of this Plan shall be deemed a waiver of similar or dissimilar provisions or conditions at the same or at any prior or subsequent time.

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5.4    Non-Assignability. Except in the event of death of a Participant, the rights and interests of the Participant under the Plan shall not be sold, transferred, assigned, pledged, encumbered, or disposed. Upon any attempt to sell, transfer, assign, pledge, encumber or otherwise dispose of any such award, such award and all rights thereunder shall immediately become null and void.

Effective November 5, 2023, in the event of a U.S.-based Participant’s death, any beneficiary designations previously permitted by Northern Trust were null and void and the cash portion of the award, if any, shall be made payable to the Participant’s beneficiary, which shall be determined in the following order:

a.the Participant’s spouse or, if none,

b.the Participant’s biological or legally adopted children (in equal amounts) or, if none,

c.the Participant’s parents (in equal amounts) or, if none,

d.the Participant’s brothers and sisters (in equal amounts) or, if none,

e.the Participant’s estate.

The equity portion of any award under the Plan shall be governed by the beneficiary designation provisions, if any, and administrative rules of the stock plan under which the equity award was granted. In the event of the death of a non-U.S.-based Participant, the Plan shall be administered in accordance with applicable local rules.

5.5    Withholdings. Northern Trust shall have the right to require, prior to the payment of any amount pursuant to an award made hereunder, payment by the Participant of any U.S. federal, state, local or other taxes which may be required to be withheld, paid or deducted in connection with such award.

5.6    Governing Law. The Plan and each award hereunder, and all determinations made and actions taken pursuant thereto, to the extent not otherwise governed by the Code or the laws of the United States or the local law of the Participant’s jurisdiction in which the employee primarily provides services, shall be governed by the laws of the State of Illinois and construed in accordance therewith without giving effect to principles of conflicts of laws.

5.7    Compliance with Applicable Securities Requirements. It is intended that all awards payable under the Plan shall be in compliance with Regulation R of the Board of Governors of the Federal Reserve System, and similar regulations promulgated by the United States Securities and Exchange Commission. It is further intended that no awards payable under the Plan will reward or incent prohibited proprietary trading.

5.8    Other Plans. Payments pursuant to the Plan shall not be treated as compensation for purposes of any other compensation or benefit plan, program or arrangement of Northern Trust, unless either (i) such other plan provides that compensation such as payments made pursuant to the Plan are to be considered as compensation thereunder or (b) the Board or the Committee so determines in writing. The adoption of the Plan shall not be construed as limiting the power of the Board or the Committee to adopt such other incentive arrangements as it may otherwise deem appropriate.

5.9    Binding Effect. The Plan shall be binding upon the Corporation and its successors and assigns and the Participants and their beneficiaries, personal representatives and heirs. If the Corporation becomes a party to any merger, consolidation or reorganization, then the Plan shall remain in full force and effect as an obligation of the Corporation or its successors in interest, unless the Plan is amended or terminated pursuant to Section 5.1.

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5.10    Unfunded Arrangement. The Plan shall at all times be entirely unfunded and no provision shall at any time be made with respect to segregating assets of the Corporation for payment of any benefit hereunder. No Participant shall have any interest in any particular assets of the Corporation or any of its affiliates by reason of the right to receive a benefit under the Plan and any such Participant shall have only the rights of an unsecured creditor of the Corporation with respect to any rights under the Plan.

5.11    Awards Subject to Clawback. The awards granted under this Plan and any cash payment, equity award or shares of Common Stock delivered pursuant to such an award are subject to forfeiture, recovery by the Corporation or other action pursuant to the applicable award agreement, addendum to this Plan or any clawback or recoupment policy which the Corporation may adopt from time to time, including without limitation the Northern Trust Corporation Policy on Recoupment, the Northern Trust UK Policy on Malus and Clawback, the Northern Trust Corporation Rule 10D-1 Incentive-Based Compensation Recoupment Policy, and any other policy which the Corporation may be required to adopt under the Dodd-Frank Wall Street Reform and Consumer Protection Act and implementing rules and regulations thereunder, or as otherwise required by law.

5.12    Foreign Employees. Without amending this Plan, the Committee may grant awards to eligible persons who are foreign nationals and/or reside outside of the United States on such terms and conditions different from those specified in this Plan as may in the judgment of the Committee be necessary or desirable to foster and promote achievement of the purpose of this Plan and, in furtherance of such purpose the Committee may make such modifications, amendments, addendum, procedures, subplans and the like as may be necessary or advisable to comply with provisions of laws in other countries or jurisdictions in which Northern Trust operates or has employees.

5.13    Protected Rights. Nothing contained in this Plan is intended to limit the Participant’s ability to (i) report possible violations of law or regulation to, or file a charge or complaint with, the Securities and Exchange Commission, the Equal Employment Opportunity Commission, the National Labor Relations Board, the Occupational Safety and Health Administration, the Department of Justice, the Congress, any Inspector General, or any other federal, state or local governmental agency or commission (“Government Agencies”), (ii) communicate with any Government Agencies or otherwise participate in any investigation or proceeding that may be conducted by any Government Agency, including providing documents or other information, without notice to the Corporation or (iii) under applicable United States federal law to (A) disclose in confidence trade secrets to federal, state, and local government officials, or to an attorney, for the sole purpose of reporting or investigating a suspected violation of law or (B) disclose trade secrets in a document filed in a lawsuit or other proceeding, but only if the filing is made under seal and protected from public disclosure.

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LOCAL ADDENDUM

Canada

In order to be eligible to receive any payment under the Plan, the Participant must be “Actively Employed” by Northern Trust on the Settlement Date. “Actively Employed” or “Active Employment” means a Participant is employed and actively performing employment duties for the Company, or is on a leave of absence approved by the Company. “Actively Employed” or “Active Employment” does not include any period during, or in respect of which the Participant is receiving or is entitled to receive payments in lieu of notice of termination, severance pay or damages for wrongful dismissal, in each case, under statute, contract, common law or otherwise. A person is not Actively Employed if his or her employment has been terminated by the person’s resignation or by the Company, regardless of whether the person’s employment has been terminated with or without cause, with or without notice, lawfully or unlawfully. No part of any payment under the Plan shall be included in any entitlement which Participant may have to payment in lieu of notice of termination, severance pay or damages for wrongful dismissal, in each case, under statute, contract, common law or otherwise.

India

Any awards made under the Plan are not and shall not be deemed or construed to be wages, allowances, compensation or benefits payable to the employee either under their contract of employment or under any applicable law.

Northern Trust EMEA Locations

The Northern Trust Corporation has entities that are regulated by the Central Bank of Ireland, the Luxembourg Commission de Surveillance du Secteur Financier and the United Kingdom Prudential Regulation Authority and/or the United Kingdom Financial Conduct Authority (collectively referred to as “Regulated Entities”). These Regulated Entities are subject to restrictions in respect of the incentive compensation that can be paid to partners classified as:

•material risk takers (“MRT”)

identified in accordance with the criteria set out in Directive 2013/36/EU of the European Parliament and of the Council and the Commission Delegated Regulation (EU) No 604/2014 which supplements Directive 2013/36/EU, and any subsequent iterations or amendments to these regulations or any secondary legislation, rules, regulations, procedures and guidelines made pursuant thereto; and/or

•identified staff (“IS”)

identified in accordance with the European Securities and Markets Authority’s (“ESMA”) guidelines on sound remuneration policies under the EU Alternative Investment Fund Managers Directive (2011/61/EU) and/or the ESMA guidelines on sound remuneration policies under the EU Undertakings for Collective Investment in Transferable Securities Directive (2009/65/EU, as amended by Directive 2014/91/EU), and any subsequent iterations or amendments to these regulations or any secondary legislation, rules, regulations, procedures and guidelines made pursuant thereto.

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These regulatory classifications may impact the terms of any incentive payments a Participant in the Plan is eligible to receive and the Authorized Senior Manager reserves the right to make appropriate changes to the terms upon which any incentive payments are made to the Participant to reflect these regulatory requirements and applicable remuneration policies.

In respect of only those Participants designated as MRTs and/or IS, in addition to the discretions reserved by Northern Trust in the Plan, and notwithstanding any terms of the Plan to the contrary, in the event that a Participant’s employment terminates by reason of resignation, the Authorized Senior Manager may, at its absolute discretion, elect to pay a pro-rata award in respect of the Plan Year in which employment terminates, and/or to pay any unpaid award referable to a previous Plan Year.

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EX-21

Exhibit 21

NORTHERN TRUST CORPORATION SUBSIDIARIES AS OF FEBRUARY 27, 2024

	Percent Owned	Jurisdiction of Incorporation
The Northern Trust Company	100%	Illinois
Equity Data Science, Inc.	18.2%	Delaware
Equity Data Science India Private Limited	99.9%	India
MFC Company, Inc.	100%	Delaware
Norlease, Inc.	100%	Delaware
Northern CDE Corporation	100%	Illinois
Northern Community Investments, LLC	100%	Illinois
TNT-APF NMTC Fund, LLC	100%	Illinois
TNT-Beacon Point NMTC Fund, LLC	100%	Illinois
TNT-BH NMTC Fund, LLC	100%	Illinois
Northern CDE 10, LLC	100%	Illinois
TNT-CASFV NMTC Fund, LLC	100%	Illinois
Northern CDE 7, LLC	100%	Illinois
TNT-Clinica Tepeyac NMTC Fund, LLC	100%	Illinois
TNT-Colorado Coalition NMTC Fund, LLC	100%	Illinois
TNT-DHA Joli NMTC Fund, LLC	100%	Illinois
TNT-DHA NMTC Fund, LLC	100%	Illinois
Northern CDE 2, LLC	100%	Illinois
TNT-Eastside NMTC Fund, LLC	100%	Illinois
Northern CDE 1, LLC	100%	Illinois
TNT-GLCAC NMTC Fund, LLC	100%	Illinois
TNT-GNG NMTC Fund, LLC	100%	Illinois
TNT-Guadalupe NMTC Fund, LLC	100%	Illinois
TNT-HCCH NMTC Fund, LLC	100%	Illinois
TNT-HHO NMTC Fund, LLC	100%	Illinois
Northern CDE 5, LLC	100%	Illinois
TNT-HopeWorks NMTC Fund, LLC	100%	Illinois
Northern CDE 6, LLC	100%	Illinois
TNT-HW 1 NMTC Fund, LLC	100%	Illinois
TNT-IndieDwell Brawley NMTC Fund, LLC	100%	Illinois
TNT-IndieDwell NMTC Fund, LLC	100%	Illinois
Northern CDE 8, LLC	100%	Illinois
TNT-Indigo NMTC Fund, LLC	100%	Illinois
TNT-Jewel NMTC Fund, LLC	100%	Illinois
TNT-JT NMTC Fund, LLC	100%	Illinois
TNT-Lawndale Legal NMTC Fund, LLC	100%	Illinois
TNT-Live6 NMTC Fund, LLC	100%	Illinois
TNT-Marygrove NMTC Fund, LLC	100%	Illinois
TNT-MG Immaculata NMTC Fund, LLC	100%	Illinois
TNT-ML NMTC Fund, LLC	100%	Illinois
TNT-New Legacy NMTC Fund, LLC	100%	Illinois
TNT-Overtown NMTC Fund, LLC	100%	Illinois
TNT-PBSA NMTC Fund, LLC	100%	Illinois
Northern CDE 3, LLC	100%	Illinois
TNT-RWA NMTC Fund, LLC	100%	Illinois
Northern CDE 9, LLC	100%	Illinois
TNT-Student U NMTC Fund, LLC	100%	Illinois

	Percent Owned	Jurisdiction of Incorporation
Northern CDE 4, LLC	100%	Illinois
TNT-WBP NMTC Fund, LLC	100%	Illinois
Northern Operating Solutions Private Limited	100%	India
Northern Trust Company of California	100%	California
Northern Trust Guernsey Holdings Limited	100%	Guernsey
Northern Trust (Guernsey) Limited	100%	Guernsey
Northern Trust Hedge Fund Services LLC	100%	Delaware
Northern Trust Holdings Limited	100%	England
Northern Trust Global Services SE	100%	Luxembourg
Northern Trust Investments, Inc.	100%	Illinois
Northern Trust Global Investments Japan, K.K.	100%	Japan
Northern Trust Investor Services Limited	100%	England
NT LTAF Nominee 1 Limited	100%	England & Wales
NT LTAF Nominee 2 Limited	100%	England & Wales
NT Property Nominees 1A Limited	100%	England
NT Property Nominees 1B Limited	100%	England
NT Property Nominees 2A Limited	100%	England
NT Property Nominees 2B Limited	100%	England
Northern Trust Pension Plan (Guernsey) Limited	100%	Guernsey
Nortrust Nominees Limited	100%	England
NT Partnership Rep, LLC	100%	Illinois
The Northern Trust Company of Delaware	100%	Delaware
The Northern Trust Company of Nevada	100%	Nevada
The Northern Trust Company UK Pension Plan Limited	100%	England
The Northern Trust Company, Canada	100%	Ontario, Canada
The Northern Trust International Banking Corporation	100%	Edge Act
Northern Operating Services Private Limited	100%	India
Northern Trust Asset Management Australia Pty Ltd	100%	Australia
Northern Trust Cayman International, Ltd.	100%	Cayman Islands, BWI
Northern Trust Equities Limited	100%	England
Northern Trust Fund Managers (Ireland) Limited	100%	Ireland
Northern Trust Global Fund Services Cayman Limited	100%	Cayman Islands, BWI
Northern Trust Management Services Asia Pte. Ltd.	100%	Singapore
Northern Operating Services Asia Inc.	99.99%	Philippines
The Northern Trust Company of Hong Kong Limited	100%	Hong Kong
Northern Trust Management Services Limited	100%	England
Northern Trust Global Investments Limited	100%	England
Northern Trust Middle East and North Africa Regional Headquarter	100%	Saudi Arabia
Northern Trust Partners Scotland Limited	100%	Scotland
Northern Trust Secretarial Services (UK) Limited	100%	England & Wales
Northern Trust Securities Australia Pty Ltd	100%	Australia
Northern Trust Securities LLP	100%	England
NT Global Advisors, Inc.	100%	Ontario, Canada
The Northern Trust Scottish Limited Partnership	100%	Scotland
Northern Trust (Ireland) Limited	100%	Ireland
Northern Trust Fiduciary Services (Ireland) Limited	100%	Ireland
Northern Trust Fund Services (Ireland) Limited	100%	Ireland

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	Percent Owned	Jurisdiction of Incorporation
Northern Trust International Fund Administration Services (Ireland) Limited	100%	Ireland
Northern Trust Management Services (Ireland) Limited	100%	Ireland
Northern Trust Nominees (Ireland) Limited	100%	Ireland
Northern Trust Pension Trustees (Ireland) Limited	100%	Ireland
Northern Trust GFS Holdings Limited	100%	Guernsey
Northern Trust Fiduciary Services (Guernsey) Limited	100%	Guernsey
Arnold Limited	100%	Guernsey
Doyle Administration Limited	100%	Guernsey
Barfield Nominees Limited	100%	Guernsey
Truchot Limited	100%	Guernsey
Vivian Limited	100%	Guernsey
Northern Trust International Fund Administration Services (Guernsey) Limited	100%	Guernsey
Admiral Nominees Limited	100%	Guernsey
Nelson Representatives Limited	100%	Guernsey
NT EBT Limited	100%	England
The Northern Trust Company of Saudi Arabia (a closed joint stock company)	100%	Saudi Arabia
50 South Capital Advisors, LLC	100%	Delaware
Equilend Holdings LLC	10%	Delaware
Northern Trust European Holdings Limited	100%	England
Northern Trust Securities, Inc.	100%	Delaware
Northern Trust Services, Inc.	100%	Illinois
Nortrust Realty Management, Inc.	100%	Illinois

3

EX-23

Exhibit 23

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the registration statements (No. 333‑180827, 333-144848, 333-86418, 333-212602 and 333-217477) on Form S-8 and the registration statement (No. 333-273725) on Form S-3 of our reports dated February 27, 2024, with respect to the consolidated financial statements of Northern Trust Corporation and the effectiveness of internal control over financial reporting.

Chicago, Illinois

February 27, 2024

EX-31.1

Exhibit 31.1

Certification of CEO Pursuant to

Section 302 of the Sarbanes-Oxley Act of 2002

I, Michael G. O’Grady, certify that:

1.I have reviewed this report on Form 10-K for the year ended December 31, 2023 of Northern Trust Corporation;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	February 27, 2024	/s/    Michael G. O’Grady
		Michael G. O’Grady
		Chief Executive Officer
		(Principal Executive Officer)

EX-31.2

Exhibit 31.2

Certification of CFO Pursuant to

Section 302 of the Sarbanes-Oxley Act of 2002

I, Jason J. Tyler, certify that:

1.I have reviewed this report on Form 10-K for the year ended December 31, 2023 of Northern Trust Corporation;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	February 27, 2024	/s/    Jason J. Tyler
		Jason J. Tyler
		Chief Financial Officer
		(Principal Financial Officer)

EX-32

Exhibit 32

Certifications of CEO and CFO Pursuant to

18 U.S.C. Section 1350, as Adopted Pursuant to

Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Annual Report of Northern Trust Corporation (the “Corporation”) on Form 10-K for the period ended December 31, 2023 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Michael G. O’Grady, as Chief Executive Officer of the Corporation, and Jason J. Tyler, as Chief Financial Officer of the Corporation, each hereby certifies, pursuant to 18 U.S.C. section 1350, as adopted pursuant to section 906 of the Sarbanes-Oxley Act of 2002, to the best of his knowledge, that:

(1)The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Corporation.

/s/    Michael G. O’Grady

Michael G. O’Grady

Chief Executive Officer

(Principal Executive Officer)

February 27, 2024

/s/    Jason J. Tyler

Jason J. Tyler

Chief Financial Officer

(Principal Financial Officer)

February 27, 2024

This certification accompanies the Report pursuant to section 906 of the Sarbanes-Oxley Act of 2002 and shall not be deemed filed by Northern Trust Corporation for purposes of section 18 of the Securities Exchange Act of 1934.

EX-97

Exhibit 97

NORTHERN TRUST CORPORATION

RULE 10D-1 INCENTIVE-BASED COMPENSATION RECOUPMENT POLICY

1.Purpose. The purpose of the Northern Trust Corporation Rule 10D-1 Incentive Based Compensation Recoupment Policy (the “Policy”) is to describe the circumstances in which Northern Trust Corporation (the “Corporation”) will recover the amount of erroneously awarded Incentive-Based Compensation (as defined below) received by a current or former Executive Officer (as defined below) in the event that the Corporation is required to prepare an Accounting Restatement (as defined below). The Policy requires the recovery of Erroneously Awarded Compensation (as defined below) in order to satisfy the requirements of the Nasdaq Stock Market LLC (“NASDAQ”) Listing Rule 5608 (the “Listing Standards”) and the requirements of Rule 10D-1 (“Rule 10D-1”) under the Securities Exchange Act of 1934, as amended, as adopted by the U.S. Securities and Exchange Commission (the “SEC”) pursuant to Section 954 of the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010.

2.Definitions. For purposes of this Policy, the following terms have the definitions set forth below:

A.“Accounting Restatement” shall mean an accounting restatement (i) due to the material noncompliance of the Corporation with any financial reporting requirement under the securities laws, including any required accounting restatement to correct an error in previously issued financial statements that is material to the previously issued financial statements, or (ii) that corrects an error that is not material to previously issued financial statements, but would result in a material misstatement if the error were corrected in the current period or left uncorrected in the current period. The Corporation’s obligation to recover erroneously awarded compensation is not dependent on if or when the restated financial statements are filed.

B.“Board” shall mean the Board of Directors of Northern Trust Corporation.

C.“Committee” shall mean the Human Capital and Compensation Committee of the Board.

D.“Corporation” shall mean Northern Trust Corporation.

E.“Effective Date” shall mean October 2, 2023.

F.“Erroneously Awarded Compensation” shall mean, with respect to each Executive Officer in connection with an Accounting Restatement, the amount of Incentive Based Compensation received that exceeds the amount of Incentive-Based Compensation that otherwise would have been received had it been determined based on the restated amounts.

G.“Executive Officer” means the Corporation’s president, principal financial officer, principal accounting officer (or if there is no such accounting officer, the controller), any vice-president of the Corporation in charge of a principal business unit, division or function (such as sales, administration, or finance), any other officer who performs a policy-making function, or any other person who performs similar policy-making functions for the Corporation. Executive officers of the Corporation’s subsidiaries are deemed Executive Officers of the Corporation if they perform such policy making functions for the Corporation. For purposes of

this Policy, any current or former Executive Officer shall be considered an Executive Officer.

H.“Financial Reporting Measures” means measures that are determined and presented in accordance with the accounting principles used in preparing the Corporation’s financial statements and any measures that are derived wholly or in part from such measures. Stock price and total shareholder return are also financial reporting measures. A financial reporting measure need not be presented within the financial statements or included in a filing with the SEC.

I.“Incentive-Based Compensation” means compensation (including without limitation cash bonuses or other cash incentive awards (including any deferred element thereof), and vested and unvested equity awards, including options, restricted stock and restricted stock units, performance stock unit awards and performance stock awards) that is granted, earned or vested based wholly or in part upon the attainment of a Financial Reporting Measure. Incentive-Based Compensation is deemed received in the Corporation’s fiscal year during which the Financial Reporting Measure specified in the Incentive-Based Compensation award is attained, even if the payment or grant of the Incentive-Based Compensation occurs after the end of that period.

J.“Restatement Date” shall mean the earlier to occur of (i) the date the Board, the Committee or the officers of the Corporation authorized to take such action, concludes, or reasonably should have concluded, that the issuer is required to prepare an Accounting Restatement, or (ii) the date of court, regulator or other legally authorized body directs the issuer to prepare an Accounting Restatement.

3.Application.

A.This Policy applies to all Incentive-Based Compensation received by a current and former Executive Officer: (i) on or after the Effective Date; (ii) after beginning service as an Executive Officer; (iii) who served as an Executive Officer at any time during the performance period for that Incentive-Based Compensation; (iv) while the Corporation has a class of securities listed on a national securities exchange or a national securities association; and (v) during the three completed fiscal years immediately preceding the date that the Corporation is required to prepare an Accounting Restatement; provided that this Policy also applies to any transition period that results from a change in the Corporation’s fiscal year within or immediately following the three completed fiscal year period; provided further that a transition period between the last day of the Corporation’s previous fiscal-year end and the first day of its new fiscal year that comprises a period of nine to 12 months would be deemed a completed fiscal year.

B.For the avoidance of doubt, this Policy applies to all Incentive-Based Compensation received on or after October 2, 2023 (even if such Incentive-Based Compensation was approved, awarded or granted to the Executive Officer prior to October 2, 2023).

4.Recovery of Erroneously Awarded Compensation.

A.In the event of an Accounting Restatement, the Committee shall promptly determine the amount of any Erroneously Awarded Compensation received, shall take steps to recover such Erroneously Awarded Compensation, and shall provide notice in writing to each Executive Officer within a reasonable period of time

2

after the Restatement Date of (i) the Restatement Date, (ii) the amount of Erroneously Awarded Compensation received, and (iii) the method, manner, and time for forfeiture, repayment, return or other methods of recovery of such Erroneously Awarded Compensation, as applicable.

B.The Committee shall have the discretion to determine the appropriate means of recovery of such Erroneously Awarded Compensation based on applicable facts and circumstances. If an Executive Officer fails to repay Erroneously Awarded Compensation to the Corporation by the time and in the manner set forth by the Committee, the Corporation shall take all actions reasonable and appropriate to recover the Erroneously Awarded Compensation from the Executive Officer. The Executive Officer shall be required to reimburse the Corporation for all expenses reasonably incurred by the Corporation in recovering Erroneously Awarded Compensation. The method of recovering any Erroneously Awarded Compensation pursuant to this Policy may include, without limitation: (i) requiring reimbursement of cash Erroneously Awarded Compensation previously paid; (ii) seeking recovery of any gain realized on the vesting, exercise, settlement, sale, transfer, or other disposition of any equity-based awards; (iii) offsetting the recouped amount from any compensation otherwise owed by the Corporation to the Executive Officer; (iv) cancelling outstanding vested or unvested equity awards; and/or (v) taking any other remedial and recovery action, as determined by the Committee or Corporation; provided, however that any such action pursuant to this subsection shall be subject to applicable law and shall be subject to compliance with Section 409A of the Internal Revenue Code. The amount of the Erroneously Awarded Compensation shall not be reduced based on, or otherwise calculated with regard to, any taxes paid by the Executive Officer with respect to such amounts.

C.For any Incentive-Based Compensation based on stock price or total shareholder return, where the amount of erroneously awarded compensation is not subject to mathematical recalculation directly from the information in an Accounting Restatement:

i.the amount will be based on a reasonable estimate of the effect of the accounting restatement on the stock price or total shareholder return upon which the Incentive-Based Compensation was received; and

ii.the Corporation will maintain documentation of the determination of that reasonable estimate and provide such documentation to the NASDAQ.

5.Recovery Exceptions. The Corporation will recover erroneously awarded compensation in accordance with this Policy, except to the extent that any of the following conditions are met and the Committee has determined that recovery would be impracticable:

A.the direct expense paid to a third party to assist in enforcing this Policy would exceed the amount to be recovered; provided that before concluding that it would be impracticable to recover any amount of erroneously awarded compensation based on expense of enforcement, the Corporation will make a reasonable attempt to recover such erroneously awarded compensation, document such reasonable attempt(s) to recover and provide such documentation to the NASDAQ;

B.recovery would violate home country law where that law was adopted prior to November 28, 2022; provided that before concluding that it would be impracticable to recover any amount of erroneously awarded compensation based

3

on violation of home country law, the Corporation will obtain an opinion of home country counsel, acceptable to the NASDAQ, that recovery would result in such a violation and provide such opinion to the NASDAQ; or

C.recovery would likely cause an otherwise tax-qualified retirement plan, under which benefits are broadly available to employees of the Corporation, to fail to meet the requirements of 26 U.S.C. 401(a)(13) or 26 U.S.C. 411(a) and regulations thereunder.

6.Suspension of Outstanding Incentive-Based Compensation. After a determination by the Committee that an Accounting Restatement may have occurred, the Committee may suspend all Incentive-Based Compensation that the Committee determines may be forfeited under this Policy or otherwise subject to offset pursuant to Section 4 above, in which case and subject to the terms of this Section, Incentive-Based Compensation subject to the suspension: (i) if unvested, will not vest, and (ii) otherwise will not be distributed or permitted to be exercised or otherwise settled. In the event the term of an option award will expire during a period of suspension, the Executive Officer will be permitted to exercise the option before it expires; however settlement of the option award following such exercise will remain suspended and the securities otherwise deliverable upon settlement shall remain subject to forfeiture under the terms of this Policy.

Following suspension of Incentive-Based Compensation, the Committee will determine as promptly as practicable whether the suspended Incentive-Based Compensation is to be forfeited or whether the suspension of the Incentive-Based Compensation is to be ended. For Incentive-Based Compensation that is ultimately not forfeited, the following provisions will apply upon the Committee’s determination to lift the suspension:

A.Unvested awards that would not otherwise have vested during the suspension by their original terms will be thereafter subject to vesting under their original terms;

B.Unvested awards that otherwise would have vested during the suspension will vest as soon as practicable and otherwise consistent with their original terms;

C.Cash awards such as annual bonus withheld during the suspension will be immediately payable;

D.In no event will distribution of cash or shares be made to an Executive Officer with respect to Incentive-Based Compensation if, by reason of termination of employment or otherwise, the Executive Officer would have forfeited the Incentive-Based Compensation if the Incentive-Based Compensation had not been suspended; and

E.Distribution or settlement of Incentive-Based Compensation will be made no later than the latest date on which such distribution or settlement would be required to avoid additional tax by reason of Section 409A of the Internal Revenue Code; provided, however, that if such distribution or settlement occurs during a period when such Incentive-Based Compensation remains suspended pursuant to this Section, then the after-tax proceeds of such distribution or settlement shall be held in escrow until such time as such Incentive-Based Compensation is no longer subject to a suspension or such amounts are determined to have been forfeited by the Committee.

4

7.Reporting and Disclosure Requirements. The Corporation shall file all disclosures with respect to this Policy in accordance with the requirement of the federal securities laws, including the disclosure required by the applicable SEC filings.

8.Indemnification Prohibition. The Corporation will not indemnify any current or former Executive Officer against the loss of erroneously awarded Incentive-Based Compensation.

9.Other Recoupment Rights. The Committee intends that this Policy will be applied to the fullest extent of the law. Any employment agreement, equity award agreement, or similar agreement entered into, amended or restated on or after the Effective Date shall, as a condition to the grant of any benefit thereunder, require an Executive Officer to agree to abide by the terms of this Policy and the application of this Policy to any award of Incentive-Based Compensation or any other compensation, including such awards made prior to the Effective Date. This Policy is not intended to limit the Corporation’s ability to pursue other means to recover Incentive-Based Compensation issued to Executive Officers under other plans or policies to the extent such recovery is not inconsistent with this Policy.

10.Administration. The Committee shall have sole discretion in making all determinations under this Policy. Any determinations of the Committee shall be binding on the Executive Officer. The authority to manage the operation and administration of this Policy is vested in the Committee. This authority includes the obligation to determine: (i) whether an Accounting Restatement has occurred for the purposes of the Policy, Rule 10D-1 and the Listing Standards and (ii) the amount of Erroneously Awarded Compensation. The Committee may retain and rely upon the advice and determinations of legal counsel, accountants and other relevant experts to operate and administer this Policy. Any interpretation of the Policy by the Committee and any decision made by it with respect to the Policy will be final, binding, and conclusive on all persons.

11.Amendment. The Committee may amend this Policy from time to time in its discretion, and shall amend this Policy as it deems necessary, appropriate, or advisable to reflect the regulations adopted by the SEC and to comply with any rules or standards adopted by a national securities exchange on which the Corporation’s securities are then listed. The Committee is authorized to interpret and construe this Policy and to make all determinations necessary, appropriate, or advisable for the administration of this Policy. It is intended that this Policy be interpreted in a manner that is consistent with the requirements of Rule 10D-1 and any applicable rules or standards adopted by the SEC and any national securities exchange on which the Corporation’s securities are then listed.

12.Successors. This Policy shall be binding and enforceable against all Executive Officers and their beneficiaries, heirs, executors, administrators, or other legal representatives.

13.Entire Agreement. To the extent inconsistent with this Policy and as permitted by applicable law, this Policy supersedes all prior contracts, agreements, and understandings, written or oral, with any Executive Officer. In the event any contract, agreement or understanding with any Executive Officer is inconsistent with the terms of this Policy, the terms of this Policy shall govern.

Approved: November 13, 2023

5

XML

Cover Page - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2023	Jan. 31, 2024	Jun. 30, 2023
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-36609
Entity Registrant Name	NORTHERN TRUST CORPORATION
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	36-2723087
Entity Address, Address Line One	50 South La Salle Street
Entity Address, City or Town	Chicago,
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60603
City Area Code	312
Local Phone Number	630-6000
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth	false
Entity Small Business	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 15.3
Entity Common Stock, Shares Outstanding (in shares)		204,841,515
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Entity Central Index Key	0000073124
Common Stock
Document Information [Line Items]
Title of 12(b) Security	Common Stock, $1.66 2/3 Par Value
Trading Symbol	NTRS
Security Exchange Name	NASDAQ
Series E Preferred Stock
Document Information [Line Items]
Title of 12(b) Security	Depositary Shares, each representing 1/1,000th interest in a share of Series E Non-Cumulative Perpetual Preferred Stock
Trading Symbol	NTRSO
Security Exchange Name	NASDAQ

XML

Audit Information	12 Months Ended
	Dec. 31, 2023
Audit Information [Abstract]
Auditor Location	Chicago, IL
Auditor Name	KPMG LLP
Auditor Firm ID	185

XML

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
ASSETS
Cash and Due from Banks	$ 4,791.5	$ 4,654.2
Federal Reserve and Other Central Bank Deposits	34,326.2	40,030.4
Interest-Bearing Deposits with Banks	1,939.0	1,941.1
Federal Funds Sold	0.0	32.0
Securities Purchased under Agreements to Resell	784.7	1,070.3
Debt Securities
Available for Sale (Amortized cost of $23,659.0 and $27,760.0)	23,089.8	26,699.9
Held to Maturity (Fair value of $24,473.0 and $22,879.3)	26,221.7	25,036.1
Trading Account	0.0	95.2
Total Debt Securities	49,311.5	51,831.2
Loans
Total loans and leases	47,617.0	42,893.3
Allowance for Credit Losses	(192.3)	(161.1)
Buildings and Equipment	502.2	500.5
Client Security Settlement Receivables	212.6	1,698.3
Goodwill	702.3	691.3
Other Assets	10,788.4	9,855.2
Total Assets	150,783.1	155,036.7
Deposits
Demand and Other Noninterest-Bearing	14,246.4	16,582.7
Savings, Money Market and Other Interest-Bearing	25,252.1	31,128.6
Savings Certificates and Other Time	4,109.7	1,981.3
Non U.S. Offices — Noninterest-Bearing	8,584.7	8,757.6
— Interest-Bearing	63,971.1	65,481.9
Total Deposits	116,164.0	123,932.1
Federal Funds Purchased	3,045.4	1,896.9
Securities Sold Under Agreements to Repurchase	784.7	567.2
Other Borrowings	6,567.8	7,592.3
Senior Notes	2,773.2	2,724.2
Long-Term Debt	4,065.0	2,066.2
Other Liabilities	5,485.1	4,998.3
Total Liabilities	138,885.2	143,777.2
STOCKHOLDERS' EQUITY
Common Stock	408.6	408.6
Additional Paid-In Capital	1,009.6	983.5
Retained Earnings	14,233.8	13,798.5
Accumulated Other Comprehensive Loss	(1,137.9)	(1,569.2)
Treasury Stock	(3,501.1)	(3,246.8)
Total Stockholders’ Equity	11,897.9	11,259.5
Total Liabilities and Stockholders’ Equity	150,783.1	155,036.7
Commercial
Loans
Total loans and leases	25,412.8	21,635.6
Personal
Loans
Total loans and leases	22,204.2	21,257.7
Series D Preferred Stock
STOCKHOLDERS' EQUITY
Preferred Stock	493.5	493.5
Series E Preferred Stock
STOCKHOLDERS' EQUITY
Preferred Stock	$ 391.4	$ 391.4

XML

Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Available for sale, amortized cost	$ 23,659.0	$ 27,760.0
Held to maturity, fair value	24,473.0	22,879.3
Financing receivable, deferred commitment fee	$ 5.9	$ 9.0
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Common stock, par value (in dollars per share)	$ 1.6667	$ 1.6667
Common stock, shares authorized (in shares)	560,000,000	560,000,000
Common stock, shares outstanding (in shares)	205,126,224	208,428,309
Treasury stock, shares (in shares)	40,045,300	36,743,215
Series D Preferred Stock
Preferred stock, shares outstanding (in shares)	5,000	5,000
Series E Preferred Stock
Preferred stock, shares outstanding (in shares)	16,000	16,000

XML

Consolidated Statements of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Noninterest Income
Trust, Investment and Other Servicing Fees	$ 4,361.8	$ 4,432.6	$ 4,361.1
Foreign Exchange Trading Income	203.9	288.6	292.6
Treasury Management Fees	31.6	39.3	44.3
Security Commissions and Trading Income	135.0	136.2	140.2
Other Operating Income	228.7	191.3	243.9
Investment Security Gains (Losses), net	(169.5)	(214.0)	(0.3)
Total Noninterest Income	4,791.5	4,874.0	5,081.8
Net Interest Income
Interest Income	7,325.0	2,877.7	1,406.5
Interest Expense	5,343.0	990.5	23.8
Net Interest Income	1,982.0	1,887.2	1,382.7
Provision for Credit Losses	24.5	12.0	(81.5)
Net Interest Income after Provision for Credit Losses	1,957.5	1,875.2	1,464.2
Noninterest Expense
Compensation	2,321.8	2,248.0	2,011.0
Employee Benefits	405.2	437.4	431.4
Outside Services	906.5	880.3	849.4
Equipment and Software	945.5	838.8	736.3
Occupancy	232.3	219.1	208.7
Other Operating Expense	472.9	359.3	299.1
Total Noninterest Expense	5,284.2	4,982.9	4,535.9
Income before Income Taxes	1,464.8	1,766.3	2,010.1
Provision for Income Taxes	357.5	430.3	464.8
NET INCOME	1,107.3	1,336.0	1,545.3
Preferred Stock Dividends	41.8	41.8	41.8
Net Income Applicable to Common Stock	$ 1,065.5	$ 1,294.2	$ 1,503.5
PER COMMON SHARE
Net Income - Basic (in dollars per share)	$ 5.09	$ 6.16	$ 7.16
Net Income - Diluted (in dollars per share)	$ 5.08	$ 6.14	$ 7.14
Average Number of Common Shares Outstanding - Basic (in shares)	207,248,094	208,309,331	208,075,522
Average Number of Common Shares Outstanding - Diluted (in shares)	207,563,746	208,867,264	208,899,230

XML

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net Income	$ 1,107.3	$ 1,336.0	$ 1,545.3
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)
Net Unrealized Gains (Losses) on Available for Sale Debt Securities	443.7	(1,474.7)	(534.7)
Net Unrealized Gains (Losses) on Cash Flow Hedges	(0.4)	3.6	0.8
Net Foreign Currency Adjustments	39.0	9.4	10.5
Net Pension and Other Postretirement Benefit Adjustments	(51.0)	(71.9)	59.8
Net Change	431.3	(1,533.6)	(463.6)
Comprehensive Income (Loss)	$ 1,538.6	$ (197.6)	$ 1,081.7

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Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Millions	Total	PREFERRED STOCK	COMMON STOCK	ADDITIONAL PAID-IN CAPITAL	RETAINED EARNINGS	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	TREASURY STOCK
Balance, beginning of period at Dec. 31, 2020	$ 11,688.3	$ 884.9	$ 408.6	$ 963.6	$ 12,207.7	$ 428.0	$ (3,204.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	1,545.3				1,545.3
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)	(463.6)					(463.6)
Dividends Declared:
Common Stock	(593.9)				(593.9)
Preferred Stock	(41.8)				(41.8)
Stock Awards and Options Exercised	150.1			(24.3)			174.4
Stock Purchased	(267.6)						(267.6)
Balance, end of period at Dec. 31, 2021	12,016.8	884.9	408.6	939.3	13,117.3	(35.6)	(3,297.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	1,336.0				1,336.0
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)	(1,533.6)					(1,533.6)
Dividends Declared:
Common Stock	(613.0)				(613.0)
Preferred Stock	(41.8)				(41.8)		0.0
Stock Awards and Options Exercised	130.5			44.2			86.3
Stock Purchased	(35.4)						(35.4)
Balance, end of period at Dec. 31, 2022	11,259.5	884.9	408.6	983.5	13,798.5	(1,569.2)	(3,246.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	1,107.3				1,107.3
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)	431.3					431.3
Dividends Declared:
Common Stock	(630.2)				(630.2)
Preferred Stock	(41.8)				(41.8)
Stock Awards and Options Exercised	121.8			26.1			95.7
Stock Purchased	(347.5)						(347.5)
Excise Tax on Share Repurchases	(2.5)						(2.5)
Balance, end of period at Dec. 31, 2023	$ 11,897.9	$ 884.9	$ 408.6	$ 1,009.6	$ 14,233.8	$ (1,137.9)	$ (3,501.1)

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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Stockholders' Equity [Abstract]
Dividends declared (in USD per share)	$ 3.00	$ 2.90	$ 2.80

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Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	$ 1,107.3	$ 1,336.0	$ 1,545.3
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Investment Security (Gains) Losses, net	169.5	1.1	0.3
Amortization and Accretion of Securities and Unearned Income, net	3.0	59.2	99.7
Provision for Credit Losses	24.5	12.0	(81.5)
Depreciation and Amortization	634.6	553.6	515.6
Change in Accrued Income Taxes	(44.4)	61.3	37.2
Pension Plan Contributions	(20.4)	(24.3)	(11.2)
Deferred Income Tax Provision	(48.2)	(142.7)	2.0
Change in Receivables	12.0	57.9	(460.9)
Change in Interest Payable	85.8	172.6	(7.8)
Change in Collateral With Derivative Counterparties, net	(72.6)	639.4	(466.5)
Other Operating Activities, net	774.5	(333.7)	183.8
Net Cash Provided by Operating Activities	2,625.6	2,392.4	1,356.0
CASH FLOWS FROM INVESTING ACTIVITIES
Change in Federal Funds Sold	32.0	(32.0)	0.0
Change in Securities Purchased under Agreements to Resell	285.4	(419.0)	897.7
Change in Interest-Bearing Deposits with Banks	28.5	(158.9)	2,344.5
Net Change in Federal Reserve and Other Central Bank Deposits	6,205.9	23,483.8	(9,970.4)
Purchases of Held to Maturity Debt Securities	(32,773.9)	(32,830.8)	(54,734.9)
Proceeds from the Maturity and Redemption of Held to Maturity Debt Securities	32,123.0	37,667.8	54,902.6
Purchases of Available for Sale Debt Securities	(7,320.2)	(4,567.7)	(13,896.2)
Proceeds from Maturity and Redemption of Available for Sale Debt Securities	11,614.8	6,513.0	10,079.0
Change in Loans	(4,702.1)	(2,441.6)	(6,744.7)
Purchases of Buildings and Equipment	(116.5)	(128.6)	(95.5)
Purchases and Development of Computer Software	(559.3)	(594.9)	(419.6)
Change in Client Security Settlement Receivables	1,505.5	258.0	(801.4)
Bank-Owned Life Insurance Policy Premiums	0.0	(500.0)	0.0
Other Investing Activities, net	(1,539.0)	(319.3)	(163.7)
Net Cash Provided by (Used in) Investing Activities	4,784.1	25,929.8	(18,602.6)
CASH FLOWS FROM FINANCING ACTIVITIES
Change in Deposits	(8,478.4)	(32,996.9)	17,885.5
Change in Federal Funds Purchased	1,148.6	1,896.7	(260.0)
Change in Securities Sold under Agreements to Repurchase	217.5	35.3	492.1
Change in Short-Term Other Borrowings	(1,059.1)	3,966.9	(426.5)
Proceeds from Long-Term Debt	2,000.0	0.0	0.0
Proceeds from Senior Notes	0.0	1,988.8	0.0
Repayments of Senior Notes	0.0	(500.0)	(500.0)
Repayment of Floating Rate Capital Debt	0.0	0.0	(278.8)
Treasury Stock Purchased	(347.5)	(35.4)	(267.6)
Net Proceeds from Stock Options	2.3	3.9	53.8
Cash Dividends Paid on Common Stock	(621.5)	(750.2)	(583.3)
Cash Dividends Paid on Preferred Stock	(41.8)	(46.5)	(41.8)
Other Financing Activities, net	(2.7)	0.0	0.1
Net Cash (Used in) Provided by Financing Activities	(7,182.6)	(26,437.4)	16,073.5
Effect of Foreign Currency Exchange Rates on Cash	(89.8)	(287.4)	(159.6)
Change in Cash and Due from Banks	137.3	1,597.4	(1,332.7)
Cash and Due from Banks at Beginning of Period	4,654.2	3,056.8	4,389.5
Cash and Due from Banks at End of Period	4,791.5	4,654.2	3,056.8
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Interest Paid	5,285.5	822.4	30.8
Income Taxes Paid	362.5	459.9	371.0
Transfers from Loans to OREO	0.2	0.0	12.9
Transfers from Available for Sale Debt Securities to Held to Maturity Debt Securities	$ 0.0	$ 6,623.3	$ 6,864.1

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Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

The consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (GAAP) and reporting practices prescribed for the banking industry. A description of the more significant accounting policies follows.

A. Basis of Presentation. The consolidated financial statements include the accounts of Northern Trust Corporation (Corporation) and its wholly-owned subsidiary, The Northern Trust Company (Bank), and various other wholly-owned subsidiaries of the Corporation and Bank. Throughout the notes to the consolidated financial statements, the term “Northern Trust” refers to the Corporation and its subsidiaries. Intercompany balances and transactions have been eliminated in consolidation. The consolidated statements of income include results of acquired subsidiaries from the dates of acquisition. Certain prior-year balances have been reclassified consistent with the current year’s presentation.

B. Nature of Operations. The Corporation is a bank holding company that has elected to be a financial holding company under the Bank Holding Company Act of 1956, as amended. The Bank is an Illinois banking corporation headquartered in Chicago and the Corporation’s principal subsidiary. The Corporation conducts business in the United States (U.S.) and internationally through various U.S. and non-U.S. subsidiaries, including the Bank.

Northern Trust generates the majority of its revenue from its two client-focused reporting segments: Asset Servicing and Wealth Management. Asset management and related services are provided to Asset Servicing and Wealth Management clients primarily by the Asset Management business.

Asset Servicing is a leading global provider of asset servicing and related services to corporate and public retirement funds, foundations, endowments, fund managers, insurance companies, sovereign wealth funds, and other institutional investors around the globe. Asset servicing and related services encompass a full range of capabilities including but not limited to: custody; fund administration; investment operations outsourcing; investment management; investment risk and analytical services; employee benefit services; securities lending; foreign exchange; treasury management; brokerage services; transition management services; banking; and cash management. Client relationships are managed through the Bank and the Bank’s and the Corporation’s other subsidiaries, including support from locations in North America, Europe, the Middle East, and the Asia-Pacific region.

Wealth Management focuses on high-net-worth individuals and families, business owners, executives, professionals, retirees, and established privately-held businesses in its target markets. In supporting these targeted segments, Wealth Management provides trust, investment management, custody, and philanthropic services; financial consulting; guardianship and estate administration; family business consulting; family financial education; brokerage services; and private and business banking. Wealth Management also includes Global Family Office, which provides customized services, including but not limited to: investment consulting; global custody; fiduciary; and private banking; family office consulting, and technology solutions, to meet the complex financial and reporting needs of ultra-high-net-worth individuals and family offices across the globe. Wealth Management services are delivered by multidisciplinary teams through a network of offices in 19 U.S. states and Washington, D.C., as well as offices in London, Guernsey, and Abu Dhabi.

C. Use of Estimates in the Preparation of Financial Statements. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions in the application of certain of our significant accounting policies that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenue and expense during the reporting period. Actual results could differ from those estimates.

D. Foreign Currency Remeasurement and Translation. Asset and liability accounts denominated in nonfunctional currencies are remeasured into functional currencies at period-end rates of exchange, except for certain balance sheet items including but not limited to buildings and equipment, goodwill and other intangible assets, which are remeasured at historical exchange rates. Results from remeasurement of asset and liability accounts are reported in Other Operating Income on the consolidated statements of income. Income and expense accounts are remeasured at period-average rates of exchange.

Asset and liability accounts of entities with functional currencies that are not the U.S. dollar are translated at period-end rates of exchange. Income and expense accounts are translated at period-average rates of exchange. Translation adjustments, net of applicable taxes, are reported directly to accumulated other comprehensive income (AOCI), a component of stockholders’ equity.

E. Securities. Available for Sale (AFS) Securities are reported at fair value, with unrealized gains and losses credited or charged, net of the tax effect, to AOCI. Realized gains and losses on AFS securities are determined on a specific identification basis and are reported within Investment Security Gains (Losses), net, on the consolidated statements of

income. Interest income is recorded on the accrual basis, adjusted for the amortization of premium and accretion of discount.

Held to Maturity (HTM) Securities consist of debt securities that management intends to, and Northern Trust has the ability to, hold until maturity. Such securities are reported at cost, adjusted for amortization of premium and accretion of discount. Interest income is recorded on the accrual basis adjusted for the amortization of premium and accretion of discount.

Held for Trading Securities are reported at fair value. Realized and unrealized gains and losses on securities held for trading are reported within Security Commissions and Trading Income on the consolidated statements of income.

Nonmarketable Securities primarily consist of Federal Reserve Bank of Chicago and Federal Home Loan Bank stock and community development investments, each of which are recorded in Other Assets on the consolidated balance sheets. Federal Reserve Bank of Chicago and Federal Home Loan Bank stock are reported at cost, which represents redemption value. Community development investments are typically reported at amortized cost. Those community development investments that are designed to generate a return primarily through realization of tax credits and other tax benefits, which are discussed in further detail in Note 28, “Variable Interest Entities,” are amortized over the lives of the related tax credits and other tax benefits.

F. Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repurchase. Securities purchased under agreements to resell and securities sold under agreements to repurchase are accounted for as collateralized financings and recorded at the amounts at which the securities were acquired or sold plus accrued interest. To minimize any potential credit risk associated with these transactions, the fair value of the securities purchased or sold is monitored, limits are set on exposure with counterparties, and the financial condition of counterparties is regularly assessed. It is Northern Trust’s policy to take possession, either directly or via third-party custodians, of securities purchased under agreements to resell. Securities sold under agreements to repurchase are either directly held by, or pledged to the counterparty until the repurchase. Northern Trust nets securities sold under agreements to repurchase against those purchased under agreements to resell when the requirements to net are met.

G. Derivative Financial Instruments. Northern Trust is a party to various derivative financial instruments that are used in the normal course of business to meet the needs of its clients, as part of its trading activity for its own account, and as part of its risk management activities. These instruments generally include foreign exchange contracts, interest rate contracts, total return swap contracts and credit default swap contracts. All derivative financial instruments, whether designated as hedges or not, are recorded at fair value within Other Assets and Other Liabilities on the consolidated balance sheets. Derivative asset and liability positions with the same counterparty are reflected on a net basis on the consolidated balance sheets in cases where legally enforceable master netting arrangements or similar agreements exist. These derivative assets and liabilities are further reduced by cash collateral received from, and deposited with, derivative counterparties. The accounting for changes in the fair value of a derivative on the consolidated statements of income depends on whether or not the contract has been designated as a hedge and qualifies for hedge accounting under GAAP. Derivative financial instruments are recorded within the line item, Other Operating Activities, net, on the consolidated statement of cash flows, except for net investment hedges which are recorded within Other Investing Activities, net.

Changes in the fair value of client-related and trading derivative instruments, which are not designated hedges under GAAP, are recognized currently in either Foreign Exchange Trading Income or Security Commissions and Trading Income on the consolidated statements of income. Changes in the fair value of derivative instruments entered into for risk management purposes but not designated as hedges are recognized currently in Other Operating Income on the consolidated statements of income. Certain derivative instruments used by Northern Trust to manage risk are formally designated and qualify for hedge accounting as fair value, cash flow, or net investment hedges.

Derivatives designated as fair value hedges are used to limit Northern Trust’s exposure to changes in the fair value of assets and liabilities due to movements in interest rates. Changes in the fair value of the derivative instrument and changes in the fair value of the hedged asset or liability attributable to the hedged risk are recognized currently in Interest Income or Interest Expense on the consolidated statements of income. For substantially all fair value hedges, Northern Trust applies the “shortcut” method of accounting, available under GAAP. As a result, changes recorded in the fair value of the hedged item are assumed to equal the offsetting gain or loss on the derivative. For fair value hedges that do not qualify for the “shortcut” method of accounting, Northern Trust utilizes regression analysis in assessing whether these hedging relationships are highly effective at inception and quarterly thereafter.

Derivatives designated as cash flow hedges are used to minimize the variability in cash flows of earning assets or forecasted transactions caused by movements in interest or foreign exchange rates. Changes in the fair value of such derivatives are recognized in AOCI, a component of stockholders’ equity, and there is no change to the accounting for the hedged item. Balances in AOCI are reclassified to earnings when the hedged forecasted transaction impacts earnings, and are reflected in the same income statement line item. Northern Trust applies the “shortcut” method of accounting for cash flow hedges of certain available for sale investment securities. For cash flow hedges of certain other available for sale

investment securities, foreign currency denominated investment securities, and forecasted foreign currency denominated revenue and expenditure transactions, Northern Trust closely matches all terms of the hedged item and hedging derivative at inception and on an ongoing basis. For cash flow hedges of available for sale investment securities, to the extent all terms are not perfectly matched, effectiveness is assessed using regression analysis. For cash flow hedges of forecasted foreign currency denominated revenue and expenditure transactions and investment securities, to the extent all terms are not perfectly matched, effectiveness is assessed using the dollar-offset method.

Foreign exchange contracts and qualifying non-derivative instruments designated as net investment hedges are used to minimize Northern Trust’s exposure to variability in the foreign currency translation of net investments in non-U.S. branches and subsidiaries. Changes in the fair value of the hedging instrument are recognized in AOCI consistent with the related translation gains and losses of the hedged net investment. For net investment hedges, all critical terms of the hedged item and the hedging instrument are matched at inception and on an ongoing basis. Amounts recorded in AOCI are reclassified to earnings only upon the sale or liquidation of an investment in a non-U.S. branch or subsidiary.

Fair value, cash flow, and net investment hedges are designated and formally documented as such contemporaneous with the transaction. The formal documentation describes the hedge relationship and identifies the hedging instruments and hedged items. Included in the documentation is a discussion of the risk management objectives and strategies for undertaking such hedges, the nature of the risk being hedged, and a description of the method for assessing hedge effectiveness at inception and on an ongoing basis. For hedges that do not qualify for the “shortcut” or the critical terms match methods of accounting, a formal assessment is performed on a calendar quarter basis to verify that derivatives used in hedging transactions continue to be highly effective in offsetting the changes in fair value or cash flows of the hedged item. Hedge accounting is discontinued if a derivative ceases to be highly effective, matures, is terminated or sold, if a hedged forecasted transaction is no longer expected to occur, or if Northern Trust removes the derivative’s hedge designation. Subsequent gains and losses on these derivatives are included in Foreign Exchange Trading Income or Security Commissions and Trading Income on the consolidated statements of income. For discontinued cash flow hedges, the accumulated gain or loss on the derivative remains in AOCI and is reclassified to earnings in the period in which the previously hedged forecasted transaction impacts earnings or is no longer probable of occurring. For discontinued fair value hedges, the previously hedged asset or liability ceases to be adjusted for changes in its fair value. Previous adjustments to the hedged item are amortized over the remaining life of the hedged item.

H. Loans. Loans are recognized assets that represent a contractual right to receive money either on demand or on fixed or determinable dates. Loans are disaggregated for disclosure purposes by portfolio segment (segment) and by class. Northern Trust has defined its segments as commercial and personal. A class of loans is a subset of a segment, the components of which have similar risk characteristics, measurement attributes, or risk monitoring methods. The classes within the commercial segment have been defined as commercial and institutional, commercial real estate, non-U.S. and other. The classes within the personal segment have been defined as residential real estate, private client and other.

Loan Classification. Loans that are held for investment are reported at the principal amount outstanding, net of unearned income. Loans classified as held for sale are reported at the lower of cost or fair value. Undrawn commitments relating to loans that are not held for sale are recorded in Other Liabilities and are carried at the amount of unamortized fees with an allowance for credit loss liability recognized for any estimated expected losses.

Nonaccrual Loans and Recognition of Income. Interest income on loans is recorded on an accrual basis unless, in the opinion of management, there is a question as to the ability of the debtor to meet the terms of the loan agreement, or interest or principal is more than 90 days contractually past due and the loan is not well-secured and in the process of collection. Loans meeting such criteria are classified as nonaccrual and interest income is recorded on a cash basis. Past due status is based on how long since the contractual due date a principal or interest payment has been past due. For disclosure purposes, loans that are 29 days past due or less are reported as current. At the time a loan is determined to be nonaccrual, interest accrued but not collected is reversed against interest income in the current period. Interest collected on nonaccrual loans is applied to principal unless, in the opinion of management, collectability of principal is not in doubt. Management’s assessment of indicators of loan collectability, and its policies relative to the recognition of interest income, including the suspension and subsequent resumption of income recognition, do not meaningfully vary between the different loan classes. Nonaccrual loans are returned to performing status when factors indicating doubtful collectability no longer exist. Factors considered in returning a loan to performing status are consistent across all classes of loans and, in accordance with regulatory guidance, relate primarily to expected payment performance. A loan is eligible to be returned to performing status when: (i) no principal or interest that is due is unpaid and repayment of the remaining contractual principal and interest is expected or (ii) the loan has otherwise become well-secured (possessing realizable value sufficient to discharge the debt, including accrued interest, in full) and is in the process of collection (through action reasonably expected to result in debt repayment or restoration to a current status in the near future). A loan that has not been brought fully current may be restored to performing status provided there has been a sustained period of repayment performance (generally a minimum of six payment periods) by the borrower in accordance with the contractual terms, and Northern Trust is reasonably assured of repayment within a reasonable period of time. Additionally, a loan that has been formally

restructured so as to be reasonably assured of repayment and performance according to its modified terms may be returned to accrual status, provided there was a well-documented credit evaluation of the borrower’s financial condition and prospects of repayment under the revised terms, and there has been a sustained period of repayment performance (generally a minimum of six payment periods) under the revised terms.

Loan Modifications to Borrowers Experiencing Financial Difficulty - After the Adoption of Accounting Standards Update No. 2022-02. For borrowers experiencing financial difficulties, Northern Trust may provide payment relief by modifying the terms of the original loan. Loan modifications to borrowers experiencing financial difficulty involve primarily the extensions of term, deferrals of principal and interest, interest rate concessions, and other modifications or a combination thereof. Northern Trust considers payment deferrals of less than 90 days as insignificant, absent any material modifications to other loan terms.

The expected credit loss for modifications to borrowers experiencing financial difficulty is measured based on either the expected future cash flows, the value of collateral, or other factors that may impact the borrower’s ability to pay. When the discounted cash flow method is applied, the expected credit loss reflects the difference between the amortized cost basis and the present value of the expected cash flows and is measured based upon the present value of expected future cash flows, discounted at the post-modification effective interest rate and contractual terms. If a loan’s contractual interest rate varies based on subsequent changes in an independent factor, such as an index or rate, the loan’s effective interest rate is calculated based on the factor as it changes over the life of the loan. Northern Trust elected not to project changes in the factor for purposes of estimating expected future cash flows. If the loan is collateral dependent, the expected loss is measured based on the fair value of the collateral at the reporting date.

If the loan valuation is less than the recorded value of the loan, either an allowance is established or a charge-off is recorded for the difference. The nature and extent of further deterioration in credit quality, including a subsequent default, is considered in the determination of an appropriate level of allowance for credit losses for all loan modifications to borrowers experiencing financial difficulty.

Troubled Debt Restructurings (TDRs) - Prior to the Adoption of Accounting Standards Update No. 2022-02. A loan that was modified as a concession by Northern Trust or a bankruptcy court resulting from the debtor’s financial difficulties was referred to as a troubled debt restructuring (TDR). All TDRs were reported starting in the calendar year of their restructuring. In subsequent years, a TDR may have ceased to be reported if the loan was modified at a market rate and performed according to the modified terms for at least six payment periods. A loan that was modified at a below market rate was returned to accrual status if it satisfied the six-payment-period performance requirement.

The expected credit loss was measured based upon the present value of expected future cash flows, discounted at the effective interest rate based on the original contractual rate. If a loan’s contractual interest rate varied based on subsequent changes in an independent factor, such as an index or rate, the loan’s effective interest rate was calculated based on the factor as it changed over the life of the loan. Northern Trust elected not to project changes in the factor for purposes of estimating expected future cash flows. Further, Northern Trust elected not to adjust the effective interest rate for prepayments. If the loan was collateral dependent, the expected loss was measured based on the fair value of the collateral at the reporting date.

If the loan valuation was less than the recorded value of the loan, either an allowance was established, or a charge-off was recorded, for the difference. Smaller balance (individually less than $1 million) homogeneous loans were collectively evaluated.

All loans with TDR modifications were evaluated for additional expected credit losses. The nature and extent of further deterioration in credit quality, including a subsequent default, was considered in the determination of an appropriate level of allowance for credit losses.

Collateral Dependent Financial Assets. A financial asset is collateral-dependent when the borrower is experiencing financial difficulty and repayment is expected to be provided substantially through the sale or operation of the collateral. Most of Northern Trust’s collateral dependent credit exposure relates to its residential real estate portfolio for which the collateral is usually the underlying real estate property. For collateral dependent financial assets, it is Northern Trust’s policy to reserve or charge-off the difference between the amortized cost basis of the loan and the value of the collateral.

Premium, Discounts, Origination Costs and Fees. Premiums and discounts on loans are recognized as an adjustment of yield using the interest method based on the contractual terms of the loan. Certain direct origination costs and fees are netted, deferred and amortized over the life of the related loan as an adjustment to the loan’s yield.

I. Allowance for Credit Losses. The allowance for credit losses represents management’s best estimate of lifetime expected credit losses related to various financial assets subject to credit risk and off-balance sheet credit exposure.

Northern Trust measures expected credit losses of financial assets with similar risk characteristics on a collective basis. A financial asset is measured individually if it does not share similar risk characteristics with other financial assets and the related allowance is determined through an individual evaluation.

Management’s estimates utilized in establishing an appropriate level of allowance for credit losses are not dependent on any single assumption. In determining an appropriate allowance level, management evaluates numerous variables, many

of which are interrelated or dependent on other assumptions and estimates, and takes into consideration past events, current conditions and reasonable and supportable forecasts.

Forecasting and Reversion. Estimating expected lifetime credit losses requires the consideration of the effect of future economic conditions. Northern Trust employs multiple scenarios over a reasonable and supportable period (currently two years) to project future conditions. Key variables determined to be relevant for projecting credit losses on the portfolios in scope include macroeconomic factors, such as corporate profits, unemployment, and real estate price indices, as well as financial market factors such as equity prices, volatility, and credit spreads. For periods beyond the reasonable and supportable period, Northern Trust reverts to its own historical loss experiences on a straight-line basis over four quarters.

Allowance for Loans. The allowance estimation methodology for the collective assessment is based on data representative of the Corporation’s financial asset portfolio from a historical observation period that includes both expansionary and recessionary periods. The estimation methodology and the related qualitative adjustment framework segregate the loan portfolio into homogeneous segments based on similar risk characteristics or risk monitoring methods.

Northern Trust utilizes a quantitative probability of default/loss given default approach for the calculation of its credit allowance on a collective basis. For each of the different parameters, specific credit models or qualitative estimation methodologies for the individual loan segments were developed. For each segment, the probability of default and the loss given default are applied to the exposure at default for each projected quarter to determine the quantitative component of the allowance. The quantitative allowance is then reviewed within a qualitative adjustment framework, through which management applies judgment by assessing internal risk factors, potential limitations in the quantitative methodology, and environmental factors that are not fully contemplated in the forecast to compute an adjustment to the quantitative allowance for each segment and class of the loan portfolio.

The allowance related to credit exposures evaluated on an individual basis is determined through evaluations of individual loans, and lending-related commitments that have defaulted, generally those with Borrower Ratings of 8 and 9, that are based on expected future cash flows, the value of collateral, and other factors that may impact the borrowers’ ability to pay. For defaulted loans for which the amount of allowance, if any, is determined based on the value of the underlying collateral, third-party appraisals are typically obtained and utilized by management. These appraisals are generally less than twelve months old and are subject to adjustments to reflect management’s judgment as to the realizable value of the collateral.

Northern Trust analyzes its exposure to credit losses from both on-balance sheet and off-balance sheet activity using a consistent methodology for the quantitative framework as well as the qualitative framework. For purposes of estimating the allowance for credit losses for undrawn loan commitments and standby letters of credit, the exposure at default includes estimated drawdowns of the undrawn commitments based on credit utilization factors, resulting in a proportionate amount of expected credit losses.

Allowance for HTM Securities. HTM debt securities classified as U.S. government, government sponsored agency, and certain securities classified as obligations of states and political subdivisions are considered to be guarantees of the U.S. government or an agency of the U.S. government, and therefore an allowance for credit losses is not estimated for such investments as the expected probability of non-payment of the amortized cost basis is zero.

HTM debt securities classified as “other asset-backed securities” represent pools of underlying receivables from which the cash flows are used to pay the bonds that vary in seniority. Utilizing a qualitative estimation approach, the allowance for other asset-backed securities is assessed by evaluating underlying pool performance based on delinquency rates and available credit support.

HTM debt securities classified as “other” relate to investments purchased by Northern Trust to fulfill its obligations under the Community Reinvestment Act (CRA). Northern Trust fulfills its obligations under the CRA by making qualified investments for purposes of supporting institutions and programs that benefit low-to-moderate income communities within Northern Trust’s market area. The allowance for CRA investments is assessed using a qualitative estimation approach primarily based on internal historical performance experience and default history of the underlying CRA portfolios to determine a quantitative component of the allowance.

The allowance estimation methodology for all other HTM debt securities is developed using a combination of external and internal data. The estimation methodology groups securities with shared characteristics for which the probability of default and the loss given default are applied to the total exposure at default to determine a quantitative component of the allowance.

Allowance for AFS Securities. AFS securities impairment reviews are conducted quarterly to identify and evaluate securities that have indications of possible credit losses. A determination as to whether a security’s decline in market value is related to credit impairment takes into consideration numerous factors and the relative significance of any single factor can vary by security. Factors Northern Trust considers in determining whether impairment is credit related include, but are not limited to, the severity of the impairment; the cause of the impairment; the financial condition and near-term prospects of the issuer; activity in the market of the issuer, which may indicate adverse credit conditions; Northern Trust’s intent regarding the sale of the security as of the balance sheet date; and the likelihood that Northern Trust will not be required to

sell the security for a period of time sufficient to allow for the recovery of the security’s amortized cost basis. For each security meeting the requirements of Northern Trust’s internal screening process, an extensive review is conducted to determine if a credit loss has occurred that is then based on the best estimate of cash flows to be collected from the security, discounted using the security’s effective interest rate. If the present value of the expected cash flows is found to be less than the current amortized cost of the security, an allowance for credit losses is generally recorded equal to the difference between the two amounts, limited to the amount the amortized cost basis exceeds the fair value of the security.

If management intends to sell, or will more likely than not be required to sell, an AFS security prior to recovery of its amortized cost basis, the security is written down to fair value with unrealized losses recognized in Investment Security Gains (Losses), net on the consolidated statements of income.

Allowance for Other Financial Assets. The allowance for other financial assets covers assets categorized as Due from Banks, Other Central Bank Deposits, Interest-Bearing Deposits with Banks, Federal Funds Sold, and Other Assets. The Other Assets category includes other miscellaneous credit exposures reported in Other Assets on the consolidated balance sheets. The allowance estimation methodology for other financial assets primarily utilizes a similar approach as the one used for the HTM debt securities portfolio. It consists of a combination of externally and internally developed loss data, adjusted for the appropriate contractual term. Northern Trust’s portfolio is composed mostly of institutions within the “1 to 3” internal borrower rating category and is expected to exhibit minimal to modest likelihood of loss.

The portion of the allowance assigned to loans, HTM debt securities, and other financial assets is presented as a contra asset in Allowance for Credit Losses on the consolidated balance sheets. The portion of the allowance assigned to undrawn loan commitments and standby letters of credit is reported in Other Liabilities on the consolidated balance sheets. The allowance for AFS securities is presented parenthetically with the amortized cost basis of AFS securities on the consolidated balance sheets.

Provision for Credit Losses. Provision for Credit Losses on the consolidated statements of income represents the change in the Allowance for Credit Losses on the consolidated balance sheets and is the charge to current period earnings. It represents the amount needed to maintain the Allowance for Credit Losses on the consolidated balance sheets at an appropriate level to absorb lifetime expected credit losses related to financial assets in scope. Actual losses may vary from current estimates and the amount of the Provision for Credit Losses may be either greater than or less than actual net charge-offs.

Contractual Term. Northern Trust estimates expected credit losses over the contractual term of the financial assets adjusted for prepayments, unless prepayments are not relevant to specific portfolios or sub-portfolios. Extension and renewal options are typically not considered since it is not Northern Trust’s practice to enter into arrangements where the borrower has the unconditional option to renew, or a conditional extension option whereby the conditions are beyond Northern Trust’s control.

Accrued Interest. Northern Trust elected not to measure an allowance for credit losses for accrued interest receivables related to its loan and securities portfolios as its policy is to write-off uncollectible accrued interest receivable balances in a timely manner. Accrued interest is written off by reversing interest income during the quarter the financial asset is moved from an accrual to a nonaccrual status.

J. Standby Letters of Credit. Fees on standby letters of credit are recognized in Other Operating Income on the consolidated statements of income using the straight-line method over the lives of the underlying agreements. Northern Trust’s recorded other liability for standby letters of credit, reflecting the obligation it has undertaken, is measured as the amount of unamortized fees on these instruments.

K. Buildings and Equipment. Buildings and equipment owned are carried at original cost less accumulated depreciation. The charge for depreciation is computed using the straight-line method based on the following range of lives: buildings – up to 30 years; equipment – 3 to 10 years; and leasehold improvements – the shorter of the lease term or 15 years.

L. Other Real Estate Owned (OREO). OREO is comprised of commercial and residential real estate properties acquired in partial or total satisfaction of loans. OREO assets are carried at the lower of cost or fair value less estimated costs to sell and are recorded in Other Assets on the consolidated balance sheets. Fair value is typically based on third-party appraisals. Appraisals of OREO properties are updated on an annual basis and are subject to adjustments to reflect management’s judgment as to the realizable value of the properties. Losses identified during the 90-day period after the acquisition of such properties are charged against the Allowance for Credit Losses assigned to Loans. Subsequent write-downs to the carrying value of these assets that may be required and gains or losses realized from asset sales are recorded within Other Operating Expense on the consolidated statements of income.

M. Goodwill and Other Intangible Assets. Goodwill is not subject to amortization. Separately identifiable acquired intangible assets with finite lives are amortized over their estimated useful lives, primarily on a straight-line basis. Purchased software, software licenses, and allowable internal costs, including compensation relating to software developed for internal use, are capitalized. Software is amortized using the straight-line method over the estimated useful lives of the

assets, generally ranging from 3 to 10 years. Fees paid for the use of software services that do not convey a software license are expensed as incurred.

Goodwill and other intangible assets are reviewed for impairment on an annual basis or more frequently if events or changes in circumstances indicate the carrying amounts may not be recoverable.

N. Trust, Investment and Other Servicing Fees. Trust, Investment and Other Servicing Fees are recorded on an accrual basis, over the period in which the service is provided. Fees are primarily a function of the market value of assets custodied, managed and serviced, transaction volumes, and securities lending volume and spreads, as set forth in the underlying client agreement. This revenue recognition involves the use of estimates and assumptions, including components that are calculated based on estimated asset valuations and transaction volumes.

O. Client Security Settlement Receivables. These receivables result from custody client security sales executed under contractual settlement date accounting that have not yet settled as well as custody client withdrawals from short-term investment funds that settle on the following business day. Northern Trust advances cash to the client on the date of either trade execution or client withdrawal and awaits collection from either the settled trade or short-term investment funds.

P. Income Taxes. Northern Trust follows an asset and liability approach to account for income taxes. The objective is to recognize the amount of taxes payable or refundable for the current year, and to recognize deferred tax assets and liabilities for future tax consequences of temporary differences between the amounts reported in the financial statements and the tax bases of assets and liabilities. The measurement of tax assets and liabilities is based on enacted tax laws and applicable tax rates.

Tax positions taken or expected to be taken on a tax return are evaluated based on their likelihood of being sustained upon examination by tax authorities. Only tax positions that are considered more-likely-than-not to be sustained are recorded on the consolidated financial statements. A valuation allowance is established for deferred tax assets if it is more-likely-than-not that all or a portion will not be realized. Northern Trust recognizes any interest and penalties related to unrecognized tax benefits in the Provision for Income Taxes on the consolidated statements of income.

Q. Cash Flow Statements. Cash and cash equivalents in the cash flow statements have been defined as “Cash and Due from Banks” on the consolidated balance sheets.

R. Pension and Other Postretirement Benefits. Northern Trust records the funded status of its defined benefit pension and other postretirement plans on the consolidated balance sheets. Overfunded pension and postretirement benefits are reported in Other Assets and underfunded pension and postretirement benefits are reported in Other Liabilities on the consolidated balance sheets. Plan assets and benefit obligations are measured annually at December 31, unless specific circumstances require an interim remeasurement. Plan assets are determined based on fair value generally representing observable market prices. The projected benefit obligations are determined based on the present value of projected benefit distributions at an assumed discount rate. Actuarial gains and losses accumulated in AOCI are amortized as a component of net periodic pension cost if they exceed 10% of the greater of the projected benefit obligation or the market-related value of plan assets as of the beginning of the year. Amortization is recognized on a straight-line basis over the expected average remaining service period of the active employees or over the expected remaining lifetime of plan participants for plans that have been previously frozen.

S. Share-Based Compensation Plans. Northern Trust recognizes as expense the grant-date fair value of stock and stock unit awards and other share-based compensation granted to employees as Compensation on the consolidated statements of income. The fair values of stock and stock unit awards, including performance stock unit awards and director awards, are based on the closing price of the Corporation’s stock on the date of grant adjusted for certain awards that do not accrue dividends while vesting.

Compensation expense for share-based award grants with terms that provide for a graded vesting schedule, whereby portions of the award vest in increments over the requisite service period, are recognized on a straight-line basis over the requisite service period for the entire award. Compensation expense for performance stock unit awards are recognized on a straight-line basis over the requisite service period of the award based on expected achievement of the performance condition. Adjustments are made for employees that meet certain eligibility criteria at the grant date or during the requisite service period.

Northern Trust does not include an estimate of future forfeitures in its recognition of share-based compensation expense. Share-based compensation expense is adjusted based on forfeitures as they occur. Dividend equivalents are accrued for performance stock unit awards, most restricted stock unit awards, and director awards not yet vested, and are paid upon vesting. Certain restricted stock units are not entitled to dividend equivalents during the vesting period. Cash flows resulting from the realization of excess tax benefits are classified as operating cash flows on the consolidated statements of cash flows.

T. Net Income Per Common Share. Basic net income per common share is computed by dividing net income/loss applicable to common stock by the weighted average number of common shares outstanding during each period. Diluted net income per common share is computed by dividing net income applicable to common stock and potential common shares by the aggregate of the weighted average number of common shares outstanding during the period and common share equivalents calculated for stock options outstanding using the treasury stock method. In a period of a net loss, diluted net income per common share is calculated in the same manner as basic net income per common share.

Northern Trust calculates net income applicable to common stock using the two-class method, whereby net income is allocated between common stock and participating securities.

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Recent Accounting Pronouncements

12 Months Ended

Dec. 31, 2023

Accounting Changes and Error Corrections [Abstract]

Recent Accounting Pronouncements

Recent Accounting Pronouncements

On January 1, 2023, Northern Trust adopted Accounting Standards Update (ASU) No. 2022-01, “Derivatives and Hedging (Topic 815): Fair Value Hedging—Portfolio Layer Method” (ASU 2022-01). The amendments in ASU 2022-01 expand the current last-of-layer hedging model from a single-layer method to allow multiple hedged layers of a single closed portfolio. To reflect that expansion, the last-of-layer method is renamed the portfolio layer method. In addition, ASU 2022-01 (1) expands the scope of the portfolio layer method to include non-prepayable assets, (2) specifies eligible hedging instruments in a single-layer hedge, (3) provides additional guidance on the accounting for and disclosure of hedge basis adjustments under the portfolio layer method and (4) specifies how hedge basis adjustments should be considered when determining credit losses for the assets included in the closed portfolio. Upon adoption of ASU 2022-01, there was no impact to Northern Trust’s consolidated balance sheets or consolidated statements of income.

On January 1, 2023, Northern Trust adopted ASU No. 2022-02, “Financial Instruments—Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures” (ASU 2022-02). The amendments in ASU 2022-02 eliminate the accounting guidance for troubled debt restructurings (TDRs) for creditors that have adopted the current expected credit losses accounting standard while enhancing disclosure requirements for certain loan refinancings and restructurings made to borrowers experiencing financial difficulty. In addition, ASU 2022-02 requires that a public business entity disclose current-period gross charge-offs by year of origination for financing receivables and net investment in leases. Upon adoption of ASU 2022-02, there was no significant impact to Northern Trust’s consolidated balance sheets or consolidated statements of income. Please refer to Note 5, “Loans” for further information.

On January 1, 2023, Northern Trust adopted ASU No. 2022-04, “Liabilities—Supplier Finance Programs (Topic 405-50): Disclosure of Supplier Finance Program Obligations” (ASU 2022-04). The amendments in ASU 2022-04 enhance the transparency about the use of supplier finance programs for investors or other allocators of capital. Specifically, ASU 2022-04 requires that a buyer in a supplier finance program disclose sufficient qualitative and quantitative information about the program to allow a user of financial statements to understand the program’s nature, activity during the period, changes from period to period, and potential magnitude. Upon adoption of ASU 2022-04, there was no impact to Northern Trust’s consolidated balance sheets or consolidated statements of income.

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Fair Value Measurements

12 Months Ended

Dec. 31, 2023

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

Fair value under GAAP is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants on the measurement date.

Fair Value Hierarchy. The following describes the hierarchy of valuation inputs (Levels 1, 2, and 3) used to measure fair value and the primary valuation methodologies used by Northern Trust for financial instruments measured at fair value on a recurring basis. Observable inputs reflect market data obtained from sources independent of the reporting entity; unobservable inputs reflect the entity’s own assumptions about how market participants would value an asset or liability based on the best information available. GAAP requires an entity measuring fair value to maximize the use of observable inputs and minimize the use of unobservable inputs and establishes a fair value hierarchy of inputs. Financial instruments are categorized within the hierarchy based on the lowest level input that is significant to their valuation. Northern Trust’s policy is to recognize transfers into and transfers out of fair value levels as of the end of the reporting period in which the transfer occurred. No transfers into or out of Level 3 occurred during the years ended December 31, 2023, or 2022.

Level 1 – Quoted, active market prices for identical assets or liabilities. Northern Trust’s Level 1 assets are comprised primarily of AFS investments in U.S. Treasury securities.

Level 2 – Observable inputs other than Level 1 prices, such as quoted active market prices for similar assets or liabilities, quoted prices for identical or similar assets in inactive markets, and model-derived valuations in which all significant inputs are observable in active markets. Northern Trust’s Level 2 assets include AFS and certain trading account debt securities, the fair values of which are determined predominantly by external pricing vendors. Prices received from vendors are compared to other vendor and third-party prices. If a security price obtained from a pricing vendor is determined to exceed pre-determined tolerance levels that are assigned based on an asset type’s characteristics, the exception is researched and, if the price is not able to be validated, an alternate pricing vendor is utilized, consistent with Northern Trust’s pricing source hierarchy. As of December 31, 2023, Northern Trust’s AFS debt securities portfolio included 929 Level 2 securities with an aggregate market value of $19.5 billion. All 929 debt securities were valued by external pricing vendors. As of December 31, 2022, Northern Trust’s AFS debt securities portfolio included 1,163 Level 2 debt securities with an aggregate market value of $24.0 billion. All 1,163 debt securities were valued by external pricing vendors.

Northern Trust has established processes and procedures to assess the suitability of valuation methodologies used by external pricing vendors, including reviews of valuation techniques and assumptions used for selected securities. On a daily basis, periodic quality control reviews of prices received from vendors are conducted which include comparisons to prices on similar security types received from multiple pricing vendors and to the previous day’s reported prices for each security. Predetermined tolerance level exceptions are researched and may result in additional validation through available market information or the use of an alternate pricing vendor. Quarterly, Northern Trust reviews documentation from third-party pricing vendors regarding the valuation processes and assumptions used in their valuations and assesses whether the fair value levels assigned by Northern Trust to each security classification are appropriate. Annually, valuation inputs used within third-party pricing vendor valuations are reviewed for propriety on a sample basis through a comparison of inputs used to comparable market data, including security classifications that are less actively traded and security classifications comprising significant portions of the portfolio.

Level 2 assets and liabilities also include derivative contracts which are valued internally using widely accepted income-based models that incorporate inputs readily observable in actively quoted markets and reflect the contractual terms of the contracts. Observable inputs include foreign exchange rates and interest rates for foreign exchange contracts; interest rates for interest rate swap contracts and forward contracts; and interest rates and volatility inputs for interest rate option contracts. Northern Trust evaluates the impact of counterparty credit risk and its own credit risk on the valuation of its derivative instruments. Factors considered include the likelihood of default by Northern Trust and its counterparties, the remaining maturities of the instruments, net exposures after giving effect to master netting arrangements or similar agreements, available collateral, and other credit enhancements in determining the appropriate fair value of derivative instruments. The resulting valuation adjustments have not been considered material.

Level 3 – Valuation techniques in which one or more significant inputs are unobservable in the marketplace.

Northern Trust’s Level 3 liabilities consist of swaps that Northern Trust entered into with the purchaser of 1.1 million and 1.0 million shares of Visa Inc. Class B common stock (Visa Class B common shares) previously held by Northern Trust and sold in June 2016 and 2015, respectively. Pursuant to the swaps, Northern Trust retains the risks associated with the ultimate conversion of the Visa Class B common shares into shares of Visa Inc. Class A common stock (Visa Class A common shares), such that the counterparty will be compensated for any dilutive adjustments to the conversion ratio and Northern Trust will be compensated for any anti-dilutive adjustments to the ratio. The swaps also require periodic payments from Northern Trust to the counterparty calculated by reference to the market price of Visa Class A common shares and a fixed rate of interest. The fair value of the swaps is determined using a discounted cash flow methodology. The significant unobservable inputs used in the fair value measurement are Northern Trust’s own assumptions about

estimated changes in the conversion rate of the Visa Class B common shares into Visa Class A common shares, the date on which such conversion is expected to occur and the estimated growth rate of the Visa Class A common share price. See “Visa Class B Common Shares” under Note 24, “Commitments and Contingent Liabilities,” for further information.

Northern Trust believes its valuation methods for its assets and liabilities carried at fair value are appropriate; however, the use of different methodologies or assumptions, particularly as applied to Level 3 assets and liabilities, could have a material effect on the computation of their estimated fair values.

Management of various businesses and departments of Northern Trust (including Corporate Market Risk, Credit Risk Management, Corporate Finance, Asset Servicing and Wealth Management) reviews valuation methods and models for Level 3 assets and liabilities. Fair value measurements are performed upon acquisitions of an asset or liability. Management of the appropriate business or department reviews assumed inputs, especially when unobservable in the marketplace, in order to substantiate their use in each fair value measurement. When appropriate, management reviews forecasts used in the valuation process in light of other relevant financial projections to understand any variances between current and previous fair value measurements. In certain circumstances, third party information is used to support the fair value measurements. If certain third party information seems inconsistent with consensus views, a review of the information is performed by management of the respective business or department to determine the appropriate fair value of the asset or liability.

The following table presents the fair values of Northern Trust’s Level 3 liabilities as of December 31, 2023 and 2022, as well as the valuation techniques, significant unobservable inputs, and quantitative information used to develop significant unobservable inputs for such liabilities as of such dates.

TABLE 51: LEVEL 3 SIGNIFICANT UNOBSERVABLE INPUTS

	DECEMBER 31, 2023
FINANCIAL INSTRUMENT	FAIR VALUE	VALUATION TECHNIQUE	UNOBSERVABLE INPUTS	INPUT VALUES			WEIGHTED-AVERAGE INPUT VALUES(1)
Swaps Related to Sale of Certain Visa Class B Common Shares	$25.4 million	Discounted Cash Flow	Conversion Rate	1.59x			1.59x
			Visa Class A Appreciation	10.49%			10.49%
			Expected Duration	9	-	27 months	13 months

(1) Weighted average of expected duration based on scenario probability.

	DECEMBER 31, 2022
FINANCIAL INSTRUMENT	FAIR VALUE	VALUATION TECHNIQUE	UNOBSERVABLE INPUTS	INPUT VALUES			WEIGHTED-AVERAGE INPUT VALUES(1)
Swaps Related to Sale of Certain Visa Class B Common Shares	$34.8 million	Discounted Cash Flow	Conversion Rate	1.60x			1.60x
			Visa Class A Appreciation	8.53%			8.53%
			Expected Duration	12	-	33 months	20 months

(1) Weighted average of expected duration based on scenario probability.

The following presents assets and liabilities measured at fair value on a recurring basis as of December 31, 2023 and 2022, segregated by fair value hierarchy level.

TABLE 52: RECURRING BASIS HIERARCHY LEVELING

	DECEMBER 31, 2023
(In Millions)	LEVEL 1		LEVEL 2		LEVEL 3		NETTING		ASSETS/ LIABILITIES AT FAIR VALUE
Debt Securities
Available for Sale
U.S. Government	$	3,622.2	$	—	$	—	$	—	$	3,622.2
Obligations of States and Political Subdivisions	—		295.8		—		—		295.8
Government Sponsored Agency	—		11,553.0		—		—		11,553.0
Non-U.S. Government	—		264.4		—		—		264.4
Corporate Debt	—		279.5		—		—		279.5
Covered Bonds	—		347.1		—		—		347.1
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	—		2,899.9		—		—		2,899.9
Other Asset-Backed	—		2,962.6		—		—		2,962.6
Commercial Mortgage-Backed	—		865.3		—		—		865.3
Total Available for Sale	3,622.2		19,467.6		—		—		23,089.8
Other Assets
Money Market Investment	95.0		—		—		—		95.0
Derivative Assets
Foreign Exchange Contracts	—		3,266.7		—		(2,937.2)		329.5
Interest Rate Contracts	—		301.5		—		(189.5)		112.0
Total Derivative Assets	—		3,568.2		—		(3,126.7)		441.5
Other Liabilities
Derivative Liabilities
Foreign Exchange Contracts	—		3,255.2		—		(2,175.7)		1,079.5
Interest Rate Contracts	—		369.2		—		(6.0)		363.2
Other Financial Derivatives(1)	—		—		25.4		(23.7)		1.7
Total Derivative Liabilities	$	—	$	3,624.4	$	25.4	$	(2,205.4)	$	1,444.4

Note: Northern Trust has elected to net derivative assets and liabilities when legally enforceable master netting arrangements or similar agreements exist between Northern Trust and the counterparty. As of December 31, 2023, derivative assets and liabilities shown above also include reductions of $2,093.8 million and $1,172.5 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties.

(1) This line consists of swaps related to the sale of certain Visa Class B common shares.

	DECEMBER 31, 2022
(In Millions)	LEVEL 1		LEVEL 2		LEVEL 3		NETTING		ASSETS/ LIABILITIES AT FAIR VALUE
Debt Securities
Available for Sale
U.S. Government	$	2,747.4	$	—	$	—	$	—	$	2,747.4
Obligations of States and Political Subdivisions	—		787.6		—		—		787.6
Government Sponsored Agency	—		11,545.2		—		—		11,545.2
Non-U.S. Government	—		360.0		—		—		360.0
Corporate Debt	—		1,747.6		—		—		1,747.6
Covered Bonds	—		388.7		—		—		388.7
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	—		2,479.4		—		—		2,479.4
Other Asset-Backed	—		5,256.2		—		—		5,256.2
Commercial Mortgage Backed	—		1,387.8		—		—		1,387.8
Total Available for Sale	2,747.4		23,952.5		—		—		26,699.9
Trading Account	95.0		0.2		—		—		95.2
Total Available for Sale and Trading Debt Securities	2,842.4		23,952.7		—		—		26,795.1
Other Assets
Derivative Assets
Foreign Exchange Contracts	—		3,510.1		—		(2,666.4)		843.7
Interest Rate Contracts	—		222.0		—		(144.3)		77.7
Other Financial Derivatives(1)	—		0.3		—		—		0.3
Total Derivatives Assets	—		3,732.4		—		(2,810.7)		921.7
Other Liabilities
Derivative Liabilities
Foreign Exchange Contracts	—		3,187.5		—		(1,826.7)		1,360.8
Interest Rate Contracts	—		431.8		—		(5.9)		425.9
Other Financial Derivatives(2)	—		—		34.8		(33.3)		1.5
Total Derivative Liabilities	$	—	$	3,619.3	$	34.8	$	(1,865.9)	$	1,788.2

Note: Northern Trust has elected to net derivative assets and liabilities when legally enforceable master netting arrangements or similar agreements exist between Northern Trust and the counterparty. As of December 31, 2022, derivative assets and liabilities shown above also include reductions of $1,140.2 million and $195.3 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties.

(1) This line consists of total return swap contracts.

(2) This line consists of swaps related to the sale of certain Visa Class B common shares.

The following table presents the changes in Level 3 liabilities for the years ended December 31, 2023 and 2022.

TABLE 53: CHANGES IN LEVEL 3 LIABILITIES

LEVEL 3 LIABILITIES	SWAPS RELATED TO SALE OF CERTAIN VISA CLASS B COMMON SHARES
(In Millions)	2023		2022
Fair Value at January 1	$	34.8	$	37.5
Total (Gains) Losses:
Included in Earnings(1)	18.9		22.6
Purchases, Issues, Sales, and Settlements
Settlements	(28.3)		(25.3)
Fair Value at December 31	$	25.4	$	34.8
Unrealized Losses (Gains) Included in Earnings Related to Financial Instruments Held at December 31(1)	$	15.4	$	16.6

(1) Gains (losses) are recorded in Other Operating Income on the consolidated statements of income.

Carrying values of assets and liabilities that are not measured at fair value on a recurring basis may be adjusted to fair value in periods subsequent to their initial recognition, for example, to record an impairment of an asset. GAAP requires entities to separately disclose these subsequent fair value measurements and to classify them under the fair value hierarchy.

Assets measured at fair value on a nonrecurring basis at December 31, 2023 and 2022, all of which were categorized as Level 3 under the fair value hierarchy, were comprised of nonaccrual loans whose values were based on real estate and other available collateral, and of OREO properties.

Fair values of real estate loan collateral were estimated using a market approach typically supported by third-party valuations and property-specific fees and taxes. As of December 31, 2023, the fair values of real estate loan collateral were subject to adjustments to reflect management’s judgment as to realizable value and consisted of discount factors ranging from 0.0% to 20.0% with a weighted average based on fair values of 2.0%. As of December 31, 2022, the fair value of real estate loan collateral consisted of discount factors ranging from 15.0% to 20.0% with a weighted average based on fair values of 17.2%. Other loan collateral, which typically consists of accounts receivable, inventory and equipment, is valued using a market approach adjusted for asset-specific characteristics and in limited instances third-party valuations are used. OREO assets are carried at the lower of cost or fair value less estimated costs to sell, with fair value typically based on third-party appraisals.

Collateral-dependent nonaccrual loans that have been adjusted to fair value totaled $43.3 million and $6.6 million at December 31, 2023 and 2022, respectively.

The following table presents the fair values of Northern Trust’s Level 3 assets that were measured at fair value on a nonrecurring basis as of December 31, 2023 and 2022, as well as the valuation technique, significant unobservable inputs, and quantitative information used to develop the significant unobservable inputs for such assets as of such dates.

TABLE 54: LEVEL 3 NONRECURRING BASIS SIGNIFICANT UNOBSERVABLE INPUTS

	DECEMBER 31, 2023
FINANCIAL INSTRUMENT	FAIR VALUE(1)	VALUATION  TECHNIQUE	UNOBSERVABLE INPUTS	INPUT VALUES			WEIGHTED-AVERAGE INPUT VALUES
Loans	$43.3 million	Market Approach	Discount factor applied to real estate collateral-dependent loans to reflect realizable value	0.0%	–	20.0%	2.0%

(1) Includes real estate collateral-dependent loans and other collateral-dependent loans.

	DECEMBER 31, 2022
FINANCIAL INSTRUMENT	FAIR VALUE(1)	VALUATION  TECHNIQUE	UNOBSERVABLE INPUTS	INPUT VALUES			WEIGHTED-AVERAGE INPUT VALUES
Loans	$6.6 million	Market Approach	Discount factor applied to real estate collateral-dependent loans to reflect realizable value	15.0%	–	20.0%	17.2%

(1) Includes real estate collateral-dependent loans and other collateral-dependent loans.

The following tables presents the book value and estimated fair value, including the fair value hierarchy level, of Northern Trust’s financial instruments that are not measured at fair value on the consolidated balance sheets as of December 31, 2023 and 2022. The following tables exclude those items measured at fair value on a recurring basis.

TABLE 55: FAIR VALUE OF FINANCIAL INSTRUMENTS

	DECEMBER 31, 2023
					ESTIMATED FAIR VALUE
(In Millions)	BOOK VALUE		TOTAL ESTIMATED FAIR VALUE		LEVEL 1		LEVEL 2		LEVEL 3
FINANCIAL ASSETS
Cash and Due from Banks	$	4,791.5	$	4,791.5	$	4,791.5	$	—	$	—
Federal Reserve and Other Central Bank Deposits	34,326.2		34,326.2		—		34,326.2		—
Interest-Bearing Deposits with Banks	1,939.0		1,939.0		—		1,939.0		—
Securities Purchased under Agreements to Resell	784.7		784.7		—		784.7		—
Debt Securities - Held to Maturity	26,221.7		24,473.0		—		24,473.0		—
Loans
Held for Investment	47,438.3		47,598.3		—		—		47,598.3
Other Assets	1,476.6		1,458.0		86.1		1,371.9		—
FINANCIAL LIABILITIES
Deposits	116,164.0		116,207.6		—		116,207.6		—
Federal Funds Purchased	3,045.4		3,045.4		—		3,045.4		—
Securities Sold Under Agreements to Repurchase	784.7		784.7		—		784.7		—
Other Borrowings	6,567.8		6,607.4		—		6,607.4		—
Senior Notes	2,773.2		2,798.1		—		2,798.1		—
Long-Term Debt	4,065.0		4,186.8		—		4,186.8		—
Unfunded Commitments	178.8		178.8		—		178.8		—
Other Liabilities	74.9		74.9		—		—		74.9

	DECEMBER 31, 2022
					ESTIMATED FAIR VALUE
(In Millions)	BOOK VALUE		TOTAL ESTIMATED FAIR VALUE		LEVEL 1		LEVEL 2		LEVEL 3
FINANCIAL ASSETS
Cash and Due from Banks	$	4,654.2	$	4,654.2	$	4,654.2	$	—	$	—
Federal Reserve and Other Central Bank Deposits	40,030.4		40,030.4		—		40,030.4		—
Interest-Bearing Deposits with Banks	1,941.1		1,941.1		—		1,941.1		—
Federal Funds Sold	32.0		32.0		—		32.0		—
Securities Purchased under Agreements to Resell	1,070.3		1,070.3		—		1,070.3		—
Debt Securities - Held to Maturity	25,036.1		22,879.3		50.0		22,829.3		—
Loans
Held for Investment	42,749.0		42,636.5		—		—		42,636.5
Other Assets	1,476.9		1,460.4		94.7		1,365.7		—
FINANCIAL LIABILITIES
Deposits(1)	123,932.1		123,926.9		—		123,926.9		—
Federal Funds Purchased	1,896.9		1,896.9		—		1,896.9		—
Securities Sold Under Agreements to Repurchase	567.2		567.2		—		567.2		—
Other Borrowings	7,592.3		7,592.8		—		7,592.8		—
Senior Notes	2,724.2		2,729.8		—		2,729.8		—
Long-Term Debt	2,066.2		2,110.7		—		2,110.7		—
Unfunded Commitments	218.9		218.9		—		218.9		—
Other Liabilities	73.2		73.2		—		—		73.2

(1) Northern Trust reclassified its leveling interpretation on client deposits, moving Demand, Noninterest-Bearing, Savings, Money Market and Other Interest-Bearing from Level 1 to Level 2 during 2023, and collapsed client deposits into one row.

XML

Securities

12 Months Ended

Dec. 31, 2023

Investments, Debt and Equity Securities [Abstract]

Securities

Securities

Available for Sale Debt Securities. The following tables provide the amortized cost, fair values, and remaining maturities of AFS debt securities.

TABLE 56: RECONCILIATION OF AMORTIZED COST TO FAIR VALUE OF AVAILABLE FOR SALE DEBT SECURITIES

	DECEMBER 31, 2023
(In Millions)	AMORTIZED COST		GROSS UNREALIZED GAINS		GROSS UNREALIZED LOSSES		FAIR VALUE
U.S. Government	$	3,681.5	$	2.2	$	61.5	$	3,622.2
Obligations of States and Political Subdivisions	315.8		—		20.0		295.8
Government Sponsored Agency	11,744.3		9.0		200.3		11,553.0
Non-U.S. Government	284.8		—		20.4		264.4
Corporate Debt	287.5		0.1		8.1		279.5
Covered Bonds	356.8		—		9.7		347.1
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	3,013.8		0.1		114.0		2,899.9
Other Asset-Backed	3,061.0		1.6		100.0		2,962.6
Commercial Mortgage-Backed	913.5		0.2		48.4		865.3
Total	$	23,659.0	$	13.2	$	582.4	$	23,089.8

	DECEMBER 31, 2022
(In Millions)	AMORTIZED COST		GROSS UNREALIZED GAINS		GROSS UNREALIZED LOSSES		FAIR VALUE
U.S. Government	$	2,837.7	$	2.5	$	92.8	$	2,747.4
Obligations of States and Political Subdivisions	817.8		—		30.2		787.6
Government Sponsored Agency	11,892.5		4.3		351.6		11,545.2
Non-U.S. Government	387.6		—		27.6		360.0
Corporate Debt	1,774.3		0.2		26.9		1,747.6
Covered Bonds	403.1		0.3		14.7		388.7
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	2,645.8		0.3		166.7		2,479.4
Other Asset-Backed	5,544.3		—		288.1		5,256.2
Commercial Mortgage-Backed	1,456.9		0.1		69.2		1,387.8
Total	$	27,760.0	$	7.7	$	1,067.8	$	26,699.9

TABLE 57: REMAINING MATURITY OF AVAILABLE FOR SALE DEBT SECURITIES

DECEMBER 31, 2023	ONE YEAR OR LESS				ONE TO FIVE YEARS				FIVE TO TEN YEARS				OVER TEN YEARS				TOTAL
(In Millions)	Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value
U.S. Government	$	198.3	$	197.8	$	3,483.2	$	3,424.4	$	—	$	—	$	—	$	—	$	3,681.5	$	3,622.2
Obligations of States and Political Subdivisions	—		—		113.2		106.8		202.6		189.0		—		—		315.8		295.8
Government Sponsored Agency	2,384.3		2,357.0		5,330.2		5,237.5		3,327.0		3,282.8		702.8		675.7		11,744.3		11,553.0
Non-U.S. Government	67.9		66.1		216.9		198.3		—		—		—		—		284.8		264.4
Corporate Debt	105.2		103.8		182.3		175.7		—		—		—		—		287.5		279.5
Covered Bonds	90.3		89.2		266.5		257.9		—		—		—		—		356.8		347.1
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	280.3		277.8		2,665.8		2,567.1		67.7		55.0		—		—		3,013.8		2,899.9
Other Asset-Backed	218.1		212.8		2,724.2		2,631.1		107.8		107.8		10.9		10.9		3,061.0		2,962.6
Commercial Mortgage-Backed	41.9		39.3		736.0		708.2		135.6		117.8		—		—		913.5		865.3
Total	$	3,386.3	$	3,343.8	$	15,718.3	$	15,307.0	$	3,840.7	$	3,752.4	$	713.7	$	686.6	$	23,659.0	$	23,089.8

Note: Mortgage-backed and asset-backed securities are included in the above table taking into account anticipated future prepayments.

Available for Sale Debt Securities with Unrealized Losses. The following table provides information regarding AFS debt securities with no credit losses reported that had been in a continuous unrealized loss position for less than twelve months and for twelve months or longer as of December 31, 2023 and 2022.

TABLE 58: AVAILABLE FOR SALE DEBT SECURITIES IN UNREALIZED LOSS POSITION WITH NO CREDIT LOSSES REPORTED

AS OF DECEMBER 31, 2023	LESS THAN 12 MONTHS				12 MONTHS OR LONGER				TOTAL
(In Millions)	FAIR VALUE		UNREALIZED LOSSES		FAIR VALUE		UNREALIZED LOSSES		FAIR VALUE		UNREALIZED LOSSES
U.S. Government	$	—	$	—	$	3,364.7	$	61.5	$	3,364.7	$	61.5
Obligations of States and Political Subdivisions	87.8		5.9		208.0		14.1		295.8		20.0
Government Sponsored Agency	331.0		11.5		9,486.6		188.8		9,817.6		200.3
Non-U.S. Government	—		—		264.5		20.4		264.5		20.4
Corporate Debt	4.4		0.1		143.0		2.1		147.4		2.2
Covered Bonds	—		—		213.2		9.7		213.2		9.7
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	—		—		2,477.0		105.8		2,477.0		105.8
Other Asset-Backed	19.8		2.0		1,998.7		98.0		2,018.5		100.0
Commercial Mortgage-Backed	60.0		4.6		776.6		43.8		836.6		48.4
Total	$	503.0	$	24.1	$	18,932.3	$	544.2	$	19,435.3	$	568.3

Note: Three corporate debt AFS securities with a fair value of $98.4 million and unrealized losses of $5.9 million and one sub-sovereign, supranational and non-U.S. agency bonds AFS security with a fair value of $71.0 million and unrealized loss of $8.2 million have been excluded from the table above as these AFS securities have a $1.2 million allowance for credit losses reported as of December 31, 2023. Refer to the discussion further below and Note 6, “Allowance for Credit Losses” for further information.

AS OF DECEMBER 31, 2022	LESS THAN 12 MONTHS				12 MONTHS OR LONGER				TOTAL
(In Millions)	FAIR VALUE		UNREALIZED LOSSES		FAIR VALUE		UNREALIZED LOSSES		FAIR VALUE		UNREALIZED LOSSES
U.S. Government	$	1,123.6	$	64.1	$	343.1	$	28.7	$	1,466.7	$	92.8
Obligations of States and Political Subdivisions	160.0		16.8		120.6		13.4		280.6		30.2
Government Sponsored Agency	7,631.4		262.1		2,737.7		89.5		10,369.1		351.6
Non-U.S. Government	235.4		17.3		124.6		10.3		360.0		27.6
Corporate Debt	427.3		14.6		130.3		2.8		557.6		17.4
Covered Bonds	238.0		13.5		42.8		1.2		280.8		14.7
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	1,305.4		74.4		807.1		83.2		2,112.5		157.6
Other Asset-Backed	3,873.4		217.5		1,247.6		70.6		5,121.0		288.1
Commercial Mortgage-Backed	670.9		47.4		215.6		21.8		886.5		69.2
Total	$	15,665.4	$	727.7	$	5,769.4	$	321.5	$	21,434.8	$	1,049.2

Note: Three corporate debt AFS securities with a fair value of $93.8 million and unrealized losses of $9.5 million and one sub-sovereign, supranational and non-U.S. agency bonds AFS security with a fair value of $68.3 million and unrealized loss of $9.1 million have been excluded from the table above as these AFS securities have a $1.3 million allowance for credit losses reported as of December 31, 2022. Refer to the discussion further below and Note 6, “Allowance for Credit Losses” for further information.

As of December 31, 2023, 898 AFS debt securities with a combined fair value of $19.4 billion were in an unrealized loss position without an allowance for credit losses, with their unrealized losses totaling $568.3 million. As of December 31, 2023, unrealized losses in AFS debt securities of $200.3 million, $105.8 million, and $100.0 million related to government sponsored agency, sub-sovereign, supranational and non-U.S. agency bonds, and other asset-backed, respectively, which are primarily attributable to lower yields and tighter spreads.

As of December 31, 2022, 1,030 AFS debt securities with a combined fair value of $21.4 billion were in an unrealized loss position without an allowance for credit losses, with their unrealized losses totaling $1.0 billion. As of December 31, 2022, unrealized losses in AFS debt securities of $351.6 million, $288.1 million, and $157.6 million related to government-sponsored agency, other asset-backed, and sub-sovereign, supranational and non-U.S. agency bonds, respectively, which are primarily attributable to changes in market interest rates and credit spreads since their purchase.

AFS debt securities impairment reviews are conducted quarterly to identify and evaluate securities that have indications of possible credit losses. A determination as to whether a security’s decline in market value is related to credit impairment takes into consideration numerous factors and the relative significance of any single factor can vary by security. Factors Northern Trust considers in determining whether impairment is credit-related include, but are not limited to, the severity of the impairment; the cause of the impairment; the financial condition and near-term prospects of the issuer; activity in the market of the issuer, which may indicate adverse credit conditions; Northern Trust’s intent regarding the sale of the security as of the balance sheet date; and the likelihood that Northern Trust will not be required to sell the

security for a period of time sufficient to allow for the recovery of the security’s amortized cost basis. For each security meeting the requirements of Northern Trust’s internal screening process, an extensive review is conducted to determine if a credit loss has occurred.

As of December 31, 2022, the Corporation intended to sell certain AFS debt securities that were in an unrealized loss position. The securities were written down to their fair value of $2.1 billion with a $213.0 million loss recognized in Investment Security Gains (Losses), net on the consolidated statements of income for the period ended December 31, 2022. In January 2023, the securities were subsequently sold, resulting in an incremental $6.9 million gain upon sale. In November 2023, the Corporation sold an additional $3.2 billion of AFS securities with a fair value of $3.0 billion, which resulted in a $176.4 million loss recognized in Investment Securities Gains (Losses), net on the consolidated statements of income for the period ended December 31, 2023.

There was a $1.2 million allowance for credit losses for AFS securities for the year ended December 31, 2023, primarily for corporate debt securities, reflecting a $0.1 million release from December 31, 2022. There was a $1.3 million allowance for credit losses for AFS securities for the year ended December 31, 2022, primarily for corporate debt securities, reflecting an increase of $1.3 million from December 31, 2021. The process for identifying credit losses for AFS securities is based on the best estimate of cash flows to be collected from the security, discounted using the security’s effective interest rate. If the present value of the expected cash flows is found to be less than the current amortized cost of the security, an allowance for credit losses is generally recorded equal to the difference between the two amounts, limited to the amount the amortized cost basis exceeds the fair value of the security. For additional information, please refer to Note 6, “Allowance for Credit Losses.”

Held to Maturity Debt Securities. The following tables provide the amortized cost, fair values and remaining maturities of held to maturity (HTM) debt securities.

TABLE 59: RECONCILIATION OF AMORTIZED COST TO FAIR VALUES OF HELD TO MATURITY DEBT SECURITIES

	DECEMBER 31, 2023
(In Millions)	AMORTIZED COST		GROSS UNREALIZED GAINS		GROSS UNREALIZED LOSSES		FAIR VALUE
U.S. Government	$	—	$	—	$	—	$	—
Obligations of States and Political Subdivisions	2,563.9		0.5		72.4		2,492.0
Government Sponsored Agency	9,355.3		2.3		1,012.4		8,345.2
Non-U.S. Government	4,789.1		0.2		90.7		4,698.6
Corporate Debt	646.1		—		28.2		617.9
Covered Bonds	2,208.6		0.3		108.3		2,100.6
Certificates of Deposit	585.1		—		0.7		584.4
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	5,245.5		3.2		294.9		4,953.8
Other Asset-Backed	214.2		0.4		0.2		214.4
Commercial Mortgage-Backed	37.6		—		0.8		36.8
Other	576.3		—		147.0		429.3
Total	$	26,221.7	$	6.9	$	1,755.6	$	24,473.0

	DECEMBER 31, 2022
(In Millions)	AMORTIZED COST		GROSS UNREALIZED GAINS		GROSS UNREALIZED LOSSES		FAIR VALUE
U.S. Government	$	50.0	$	—	$	—	$	50.0
Obligations of States and Political Subdivisions	2,565.3		—		149.8		2,415.5
Government Sponsored Agency	9,407.7		—		1,076.0		8,331.7
Non-U.S. Government	3,234.0		0.1		133.8		3,100.3
Corporate Debt	713.3		—		45.4		667.9
Covered Bonds	2,530.3		0.3		158.7		2,371.9
Certificates of Deposit	35.9		—		—		35.9
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	5,703.3		1.0		436.1		5,268.2
Other Asset-Backed	263.7		—		1.0		262.7
Other	532.6		—		157.4		375.2
Total	$	25,036.1	$	1.4	$	2,158.2	$	22,879.3

As of December 31, 2023, the $26.2 billion HTM debt securities portfolio had unrealized losses of $1.0 billion and $294.9 million related to government sponsored agency and sub-sovereign, supranational and non-U.S. agency bonds, respectively, which are primarily attributable to lower yields and tighter spreads. As of December 31, 2022, the $25.0 billion HTM debt securities portfolio had unrealized losses of $1.1 billion and $436.1 million related to government-sponsored agency and sub-sovereign, supranational and non-U.S. agency bonds, respectively, which are primarily attributable to changes in overall market interest rates and credit spreads since their purchase.

TABLE 60: REMAINING MATURITY OF HELD TO MATURITY DEBT SECURITIES

DECEMBER 31, 2023	ONE YEAR OR LESS				ONE TO FIVE YEARS				FIVE TO TEN YEARS				OVER TEN YEARS				TOTAL
(In Millions)	Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value
U.S. Government	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Obligations of States and Political Subdivisions	45.7		45.3		1,100.7		1,076.8		1,126.3		1,090.8		291.2		279.1		2,563.9		2,492.0
Government Sponsored Agency	984.3		885.4		3,381.4		3,037.6		3,248.6		2,905.4		1,741.0		1,516.8		9,355.3		8,345.2
Non-U.S. Government	3,376.0		3,374.3		1,379.3		1,294.7		33.8		29.6		—		—		4,789.1		4,698.6
Corporate Debt	276.8		269.5		353.7		335.2		15.6		13.2		—		—		646.1		617.9
Covered Bonds	345.4		342.1		1,623.1		1,542.5		240.1		216.0		—		—		2,208.6		2,100.6
Certificates of Deposit	585.1		584.4		—		—		—		—		—		—		585.1		584.4
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	1,080.8		1,055.6		4,159.0		3,893.6		5.7		4.6		—		—		5,245.5		4,953.8
Other Asset-Backed	14.7		14.7		102.0		102.1		97.5		97.6		—		—		214.2		214.4
Commercial Mortgage-Backed	—		—		37.6		36.8		—		—		—		—		37.6		36.8
Other	47.8		46.7		319.0		287.9		30.7		23.5		178.8		71.2		576.3		429.3
Total	$	6,756.6	$	6,618.0	$	12,455.8	$	11,607.2	$	4,798.3	$	4,380.7	$	2,211.0	$	1,867.1	$	26,221.7	$	24,473.0

Note: Mortgage-backed and asset-backed securities are included in the above table taking into account anticipated future prepayments.

HTM debt securities consist of securities that management intends to, and Northern Trust has the ability to, hold until maturity. During the year ended December 31, 2022, for capital management purposes, the Corporation transferred government sponsored agency and obligations of states and political subdivisions securities that had a fair value of $6.6 billion from the AFS to HTM classification, all of which were transferred in the third quarter of 2022. Upon transfer of a debt security from the AFS to HTM classification, the amortized cost is reset to fair value. Any net unrealized gain or loss at the date of transfer will remain in AOCI and be amortized into Net Interest Income over the remaining life of the securities using the effective interest method. The amortization of amounts retained in AOCI will offset the effect on interest income of the amortization of the premium or discount resulting from transferring the securities at fair value.

Credit Quality Indicators. The following table provides the amortized cost of HTM debt securities by credit rating.

TABLE 61: AMORTIZED COST OF HELD TO MATURITY DEBT SECURITIES BY CREDIT RATING

	AS OF DECEMBER 31, 2023
($ In Millions)	AAA			AA			A			BBB			NOT RATED			TOTAL
U.S. Government	$	—		$	—		$	—		$	—		$	—		$	—
Obligations of States and Political Subdivisions	954.7			1,609.0			—			—			0.2			2,563.9
Government Sponsored Agency	9,355.3			—			—			—			—			9,355.3
Non-U.S. Government	813.3			1,179.6			2,463.3			332.9			—			4,789.1
Corporate Debt	2.1			302.6			341.4			—			—			646.1
Covered Bonds	2,208.6			—			—			—			—			2,208.6
Certificates of Deposit	545.9			—			—			—			39.2			585.1
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	4,047.9			1,166.5			30.0			1.1			—			5,245.5
Other Asset-Backed	214.2			—			—			—			—			214.2
Commercial Mortgage-Backed	37.6			—			—			—			—			37.6
Other	54.8			—			—			—			521.5			576.3
Total	$	18,234.4		$	4,257.7		$	2,834.7		$	334.0		$	560.9		$	26,221.7
Percent of Total	70		%	16		%	11		%	1		%	2		%	100		%

	AS OF DECEMBER 31, 2022
($ In Millions)	AAA			AA			A			BBB			NOT RATED			TOTAL
U.S. Government	$	50.0		$	—		$	—		$	—		$	—		$	50.0
Obligations of States and Political Subdivisions	926.8			1,638.5			—			—			—			2,565.3
Government Sponsored Agency	9,407.7			—			—			—			—			9,407.7
Non-U.S. Government	762.2			926.5			1,223.0			322.3			—			3,234.0
Corporate Debt	2.1			305.7			405.5			—			—			713.3
Covered Bonds	2,530.3			—			—			—			—			2,530.3
Certificates of Deposit	—			—			—			—			35.9			35.9
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	4,171.3			1,502.0			28.9			1.1			—			5,703.3
Other Asset-Backed	263.7			—			—			—			—			263.7
Other	65.8			—			—			—			466.8			532.6
Total	$	18,179.9		$	4,372.7		$	1,657.4		$	323.4		$	502.7		$	25,036.1
Percent of Total	73		%	17		%	7		%	1		%	2		%	100		%

Credit quality indicators are metrics that provide information regarding the relative credit risk of debt securities. Northern Trust maintains a high quality debt securities portfolio, with 97% of the HTM portfolio composed of securities rated A or higher as of both December 31, 2023 and 2022. The remaining HTM debt securities portfolio was composed of 1% rated BBB at both December 31, 2023 and 2022, and 2% not rated by Moody’s, S&P Global, or Fitch Ratings at both December 31, 2023 and 2022. Securities not explicitly rated were grouped where possible under the credit rating of the issuer of the security.

Investment Security Gains and Losses. There was a $176.4 million available for sale debt security loss arising from a repositioning of the portfolio during the fourth quarter of 2023 and a $6.9 million gain upon sale of certain available for sale debt securities in the first quarter of 2023. During the fourth quarter of 2022, losses of $213.0 million were recognized in conjunction with the intent to sell certain AFS debt securities which is included in the tables below. Proceeds of $5.2 billion, $138.7 million and $116.7 million in 2023, 2022 and 2021, respectively, from the sale of debt securities resulted in the following pre-tax Investment Security Gains (Losses), net shown in the following tables.

TABLE 62: INVESTMENT SECURITY GAINS AND LOSSES

	DECEMBER 31,
(In Millions)	2023		2022		2021
Gross Realized Debt Securities Gains	$	10.5	$	—	$	1.4
Gross Realized Debt Securities Losses	(180.0)		(214.0)		(1.7)
Investment Security Gains (Losses), net(1)	$	(169.5)	$	(214.0)	$	(0.3)

(1) $214.0 million of Investment Security Gains (Losses), net includes a $213.0 million loss recognized in 2022 in conjunction with the intent to sell certain AFS debt securities.

TABLE 63: INVESTMENT SECURITY GAINS AND LOSSES BY SECURITY TYPE

	DECEMBER 31,
(In Millions)	2023		2022		2021
U.S. Governments	$	(29.9)	$	—	$	—
Obligations of States and Political Subdivisions	9.8		(95.8)		—
Government Sponsored Agency	(73.2)		—		—
Corporate Debt	(7.6)		(67.3)		(0.3)
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	(9.1)		—		—
Other Asset-Backed	(58.6)		(17.1)		—
Commercial Mortgage-Backed	(0.9)		(33.8)		—
Investment Security Gains (Losses), net(1)	$	(169.5)	$	(214.0)	$	(0.3)

(1) $214.0 million of Investment Security Gains (Losses), net includes a $213.0 million loss recognized in 2022 in conjunction with the intent to sell certain AFS debt securities.

XML

Loans

12 Months Ended

Dec. 31, 2023

Receivables [Abstract]

Loans

Loans

Amounts outstanding for Loans, by segment and class, are shown in the following table.

TABLE 64: LOANS

	DECEMBER 31,
(In Millions)	2023		2022
Commercial
Commercial and Institutional(1)	$	11,555.3	$	12,415.0
Commercial Real Estate	5,134.2		4,773.0
Non-U.S.(1)	2,778.5		3,131.1
Other	5,944.8		1,316.5
Total Commercial	25,412.8		21,635.6
Personal
Private Client	14,360.0		14,119.0
Residential Real Estate	6,327.1		6,413.5
Non-U.S.	428.8		510.0
Other	1,088.3		215.2
Total Personal	22,204.2		21,257.7
Total Loans	$	47,617.0	$	42,893.3

(1) Commercial and institutional and commercial-non-U.S. combined include $4.5 billion and $5.6 billion of private equity capital call finance loans at December 31, 2023 and 2022, respectively.

Residential real estate loans consist of traditional first lien mortgages and equity credit lines that generally require a loan-to-collateral value ratio of 65% to 80% at inception. Northern Trust’s equity credit line products generally have draw periods of up to 10 years and a balloon payment of any outstanding balance is due at maturity. Payments are interest-only with variable interest rates. Northern Trust does not offer equity credit lines that include an option to convert the outstanding balance to an amortizing payment loan. As of December 31, 2023 and 2022, equity credit lines totaled $228.7 million and $248.6 million, respectively. Equity credit lines for which first liens were held by Northern Trust represented 96% and 98% of the total equity credit lines as of December 31, 2023 and 2022, respectively.

Included within the other commercial, non-U.S. commercial, and other personal classes are short duration advances, primarily related to the processing of custodied client investments, totaling $8.4 billion and $2.9 billion at December 31, 2023 and 2022, respectively. The $8.4 billion short duration advances at December 31, 2023 primarily reflected higher levels of year-end trading and settlement activity. Demand deposit overdrafts reclassified as loan balances, primarily in personal-other, totaled $12.1 million and $24.4 million at December 31, 2023 and 2022, respectively. There were no loans classified as held for sale on either December 31, 2023 or December 31, 2022. Loans classified as held for sale are recorded at the lower of cost or fair value. There was a $2.5 million commercial real estate loan sold during the year ended December 31, 2023. There were $11.2 million of loans sold during the year ended December 31, 2022, which were composed of residential real estate and commercial and institutional loans.

Credit Quality Indicators. Credit quality indicators are statistics, measurements or other metrics that provide information regarding the relative credit risk of loans. Northern Trust uses a variety of credit quality indicators to assess the credit risk of loans at the segment, class, and individual credit exposure levels.

As part of its credit process, Northern Trust utilizes an internal borrower risk rating system to support identification, approval, and monitoring of credit risk. Borrower risk ratings are used in credit underwriting and management reporting. Risk ratings are used for ranking the credit risk of borrowers and their probability of default. Each borrower is rated using one of a number of ratings models, which consider both quantitative and qualitative factors. The ratings models vary among classes of loans in order to capture the unique risk characteristics inherent within each particular type of credit exposure. Provided below are the more significant performance indicator attributes considered within Northern Trust’s borrower rating models, by loan class:

•Commercial and Institutional: leverage, profit margin, liquidity, asset size and capital levels;

•Commercial Real Estate: debt service coverage, loan-to-value ratio, leasing status and guarantor support;

•Commercial-Other: leverage, profit margin, liquidity, asset size and capital levels;

•Non-U.S.: leverage, profit margin, liquidity, return on assets and capital levels;

•Residential Real Estate: payment history, credit bureau scores and loan-to-value ratio;

•Private Client: cash-flow-to-debt and net worth ratios, leverage and liquidity; and

•Personal-Other: cash-flow-to-debt and net worth ratios.

While the criteria vary by model, the objective is for the borrower ratings to be consistent in both the measurement and ranking of risk. Each model is calibrated to a master rating scale to support this consistency. Ratings for borrowers not in default range from “1” for the strongest credits to “7” for the weakest non-defaulted credits. Ratings of “8” or “9” are used for defaulted borrowers. Borrower risk ratings are monitored and are revised when events or circumstances indicate a change is required. Risk ratings are generally validated at least annually.

Loans in the “1 to 3” category are expected to exhibit minimal to modest probabilities of default and are characterized by borrowers having the strongest financial qualities, including above average financial flexibility, cash flows and capital levels. Borrowers assigned these ratings are anticipated to experience very little to moderate financial pressure in adverse down-cycle scenarios. As a result of these characteristics, borrowers within this category exhibit a minimal to modest likelihood of loss. Loans in the “4 to 5” category are expected to exhibit moderate to acceptable probabilities of default and are characterized by borrowers with less financial flexibility than those in the “1 to 3” category. Cash flows and capital levels are generally sufficient to allow for borrowers to meet current requirements, but have fewer financial resources to manage through economic downturns. As a result of these characteristics, borrowers within this category exhibit a moderate likelihood of loss. Loans in the watch list category have elevated credit risk profiles that are monitored through internal watch lists, and consist of credits with borrower ratings of “6 to 9.” These credits, which include all nonaccrual credits, are expected to exhibit probabilities of default, elevated risk of default, or are currently in default. Borrowers associated with these risk profiles that are not currently in default have limited financial flexibility. Cash flows and capital levels range from acceptable to potentially insufficient to meet current requirements, particularly in adverse down cycle scenarios. As a result of these characteristics, borrowers in this category exhibit an elevated to probable likelihood of loss.

Loan segment and class balances as of December 31, 2023 are provided in the following table, segregated by borrower ratings into “1 to 3,” “4 to 5” and “6 to 9” (watch list and nonaccrual status) categories by year of origination at amortized cost basis. Loans that are held for investment are reported at the principal amount outstanding, net of unearned income.

TABLE 65: CREDIT QUALITY INDICATOR AT AMORTIZED COST BASIS BY ORIGINATION YEAR

DECEMBER 31, 2023	TERM LOANS												REVOLVING LOANS		REVOLVING LOANS CONVERTED TO TERM LOANS
(In Millions)	2023		2022		2021		2020		2019		PRIOR						TOTAL
Commercial
Commercial and Institutional
Risk Rating:
1 to 3 Category	$	443.9	$	534.1	$	668.3	$	78.1	$	137.2	$	409.9	$	4,909.8	$	15.0	$	7,196.3
4 to 5 Category	801.4		790.9		729.5		138.7		120.5		178.7		1,332.4		72.0		4,164.1
6 to 9 Category	13.8		70.0		60.8		12.0		0.1		1.7		34.7		1.8		194.9
Total Commercial and Institutional	1,259.1		1,395.0		1,458.6		228.8		257.8		590.3		6,276.9		88.8		11,555.3
Commercial Real Estate (CRE)
Risk Rating:
1 to 3 Category	403.6		389.9		159.1		23.9		37.8		44.8		51.0		—		1,110.1
4 to 5 Category	1,513.5		1,208.8		521.0		218.4		252.8		96.0		136.3		7.9		3,954.7
6 to 9 Category	16.1		—		30.5		—		8.2		14.6		—		—		69.4
Total CRE	1,933.2		1,598.7		710.6		242.3		298.8		155.4		187.3		7.9		5,134.2
CRE Gross Charge-offs	(0.7)		(4.4)		—		—		—		—		—		—		(5.1)
Non-U.S.
Risk Rating:
1 to 3 Category	487.9		—		43.2		65.2		34.2		3.3		760.0		—		1,393.8
4 to 5 Category	974.7		0.8		—		—		—		150.0		243.4		—		1,368.9
6 to 9 Category	1.5		14.3		—		—		—		—		—		—		15.8
Total Non-U.S.	1,464.1		15.1		43.2		65.2		34.2		153.3		1,003.4		—		2,778.5
Other
Risk Rating:
1 to 3 Category	4,313.2		—		—		—		—		—		—		—		4,313.2
4 to 5 Category	1,631.6		—		—		—		—		—		—		—		1,631.6
Total Other	5,944.8		—		—		—		—		—		—		—		5,944.8
Other Gross Charge-offs	(0.6)		—		—		—		—		—		—		—		(0.6)
Total Commercial	10,601.2		3,008.8		2,212.4		536.3		590.8		899.0		7,467.6		96.7		25,412.8
Commercial Gross Charge-offs	(1.3)		(4.4)		—		—		—		—		—		—		(5.7)
Personal
Private Client
Risk Rating:
1 to 3 Category	504.7		140.8		52.3		67.5		8.7		134.7		5,320.9		168.1		6,397.7
4 to 5 Category	290.1		488.2		655.1		100.9		158.8		44.7		5,721.5		447.8		7,907.1
6 to 9 Category	23.6		0.3		—		—		—		18.3		13.0		—		55.2
Total Private Client	818.4		629.3		707.4		168.4		167.5		197.7		11,055.4		615.9		14,360.0
Residential Real Estate (RRE)
Risk Rating:
1 to 3 Category	278.7		464.0		500.6		373.3		142.4		722.4		219.8		—		2,701.2
4 to 5 Category	191.6		694.9		717.4		686.7		290.0		805.3		170.3		—		3,556.2
6 to 9 Category	—		10.9		—		0.7		1.6		43.6		12.9		—		69.7
Total RRE	470.3		1,169.8		1,218.0		1,060.7		434.0		1,571.3		403.0		—		6,327.1
RRE Gross Charge-offs	(0.8)		—		—		—		—		(1.0)		—		—		(1.8)
Non-U.S.
Risk Rating:
1 to 3 Category	15.5		—		0.6		—		—		4.6		71.4		—		92.1
4 to 5 Category	12.7		16.0		39.2		—		16.4		8.9		236.1		7.4		336.7
Total Non-U.S.	28.2		16.0		39.8		—		16.4		13.5		307.5		7.4		428.8
Other
Risk Rating:
1 to 3 Category	461.7		—		—		—		—		—		—		—		461.7
4 to 5 Category	626.6		—		—		—		—		—		—		—		626.6
Total Other	1,088.3		—		—		—		—		—		—		—		1,088.3
Total Personal	2,405.2		1,815.1		1,965.2		1,229.1		617.9		1,782.5		11,765.9		623.3		22,204.2
Personal Gross Charge-offs	(0.8)		—		—		—		—		(1.0)		—		—		(1.8)
Total Loans	$	13,006.4	$	4,823.9	$	4,177.6	$	1,765.4	$	1,208.7	$	2,681.5	$	19,233.5	$	720.0	$	47,617.0
Total Loans Gross Charge-offs	$	(2.1)	$	(4.4)	$	—	$	—	$	—	$	(1.0)	$	—	$	—	$	(7.5)

December 31, 2022	TERM LOANS												REVOLVING LOANS		REVOLVING LOANS CONVERTED TO TERM LOANS
(In Millions)	2022		2021		2020		2019		2018		PRIOR						TOTAL
Commercial
Commercial and Institutional
Risk Rating:
1 to 3 Category	$	753.3	$	1,087.5	$	209.8	$	159.3	$	45.9	$	511.3	$	6,032.8	$	17.7	$	8,817.6
4 to 5 Category	744.1		740.6		300.8		191.1		151.4		174.7		1,102.3		32.9		3,437.9
6 to 9 Category	50.8		30.5		—		13.7		—		—		64.5		—		159.5
Total Commercial and Institutional	1,548.2		1,858.6		510.6		364.1		197.3		686.0		7,199.6		50.6		12,415.0
CRE
Risk Rating:
1 to 3 Category	318.7		227.4		123.6		123.5		39.8		39.1		113.4		3.0		988.5
4 to 5 Category	968.5		1,040.0		637.8		447.3		153.0		256.9		181.5		17.5		3,702.5
6 to 9 Category	7.7		22.7		—		49.1		—		—		2.5		—		82.0
Total CRE	1,294.9		1,290.1		761.4		619.9		192.8		296.0		297.4		20.5		4,773.0
Non-U.S.
Risk Rating:
1 to 3 Category	991.9		46.2		109.6		14.8		—		6.5		1,158.3		—		2,327.3
4 to 5 Category	459.0		—		—		—		—		214.9		89.5		1.8		765.2
6 to 9 Category	0.1		—		—		23.1		—		—		15.4		—		38.6
Total Non-U.S.	1,451.0		46.2		109.6		37.9		—		221.4		1,263.2		1.8		3,131.1
Other
Risk Rating:
1 to 3 Category	993.9		—		—		—		—		—		—		—		993.9
4 to 5 Category	322.6		—		—		—		—		—		—		—		322.6
Total Other	1,316.5		—		—		—		—		—		—		—		1,316.5
Total Commercial	5,610.6		3,194.9		1,381.6		1,021.9		390.1		1,203.4		8,760.2		72.9		21,635.6
Personal
Private Client
Risk Rating:
1 to 3 Category	395.5		159.9		50.5		313.6		13.4		18.5		5,352.5		28.2		6,332.1
4 to 5 Category	430.3		755.1		192.4		191.3		38.7		160.0		5,728.6		267.2		7,763.6
6 to 9 Category	0.9		—		0.1		—		18.6		—		3.7		—		23.3
Total Private Client	826.7		915.0		243.0		504.9		70.7		178.5		11,084.8		295.4		14,119.0
RRE
Risk Rating:
1 to 3 Category	871.6		666.7		567.7		168.1		102.9		750.8		128.4		7.9		3,264.1
4 to 5 Category	354.3		656.7		597.6		290.0		170.9		838.2		180.4		1.0		3,089.1
6 to 9 Category	—		6.8		1.5		1.1		3.7		35.9		11.3		—		60.3
Total RRE	1,225.9		1,330.2		1,166.8		459.2		277.5		1,624.9		320.1		8.9		6,413.5
Non-U.S.
Risk Rating:
1 to 3 Category	3.0		3.7		—		—		4.6		2.3		124.6		—		138.2
4 to 5 Category	24.2		40.3		—		21.3		3.2		2.9		272.0		7.8		371.7
6 to 9 Category	—		—		—		—		—		0.1		—		—		0.1
Total Non-U.S.	27.2		44.0		—		21.3		7.8		5.3		396.6		7.8		510.0
Other
Risk Rating:
1 to 3 Category	190.8		—		—		—		—		—		—		—		190.8
4 to 5 Category	24.4		—		—		—		—		—		—		—		24.4
Total Other	215.2		—		—		—		—		—		—		—		215.2
Total Personal	2,295.0		2,289.2		1,409.8		985.4		356.0		1,808.7		11,801.5		312.1		21,257.7
Total Loans	$	7,905.6	$	5,484.1	$	2,791.4	$	2,007.3	$	746.1	$	3,012.1	$	20,561.7	$	385.0	$	42,893.3

Past Due Status. Past due status is based on the length of time from the contractual due date a principal or interest payment has been past due. For disclosure purposes, loans that are 29 days past due or less are reported as current. The following table provides balances and delinquency status of accrual and nonaccrual loans by segment and class, as well as the other real estate owned and nonaccrual asset balances, as of December 31, 2023 and 2022.

TABLE 66: DELINQUENCY STATUS

	ACCRUAL														NONACCRUAL WITH NO ALLOWANCE
(In Millions)	CURRENT		30 – 59 DAYS PAST DUE		60 – 89 DAYS PAST DUE		90 DAYS OR MORE PAST DUE		TOTAL ACCRUAL		NONACCRUAL		TOTAL LOANS
December 31, 2023
Commercial
Commercial and Institutional	$	11,374.6	$	163.7	$	0.7	$	—	$	11,539.0	$	16.3	$	11,555.3	$	4.1
Commercial Real Estate	5,123.7		4.4		6.1		—		5,134.2		—		5,134.2		—
Non-U.S.	2,778.5		—		—		—		2,778.5		—		2,778.5		—
Other	5,944.8		—		—		—		5,944.8		—		5,944.8		—
Total Commercial	25,221.6		168.1		6.8		—		25,396.5		16.3		25,412.8		4.1
Personal
Private Client	14,240.0		63.9		24.8		11.0		14,339.7		20.3		14,360.0		18.3
Residential Real Estate	6,283.0		7.5		0.5		9.1		6,300.1		27.0		6,327.1		27.0
Non-U.S.	428.2		—		0.6		—		428.8		—		428.8		—
Other	1,088.3		—		—		—		1,088.3		—		1,088.3		—
Total Personal	22,039.5		71.4		25.9		20.1		22,156.9		47.3		22,204.2		45.3
Total Loans	$	47,261.1	$	239.5	$	32.7	$	20.1	$	47,553.4	$	63.6	$	47,617.0	$	49.4
					Other Real Estate Owned						$	1.5
					Total Nonaccrual Assets						$	65.1

	ACCRUAL														NONACCRUAL WITH NO ALLOWANCE
(In Millions)	CURRENT		30 – 59 DAYS PAST DUE		60 – 89 DAYS PAST DUE		90 DAYS OR MORE PAST DUE		TOTAL ACCRUAL		NONACCRUAL		TOTAL LOANS
December 31, 2022
Commercial
Commercial and Institutional	$	12,353.7	$	40.2	$	3.0	$	0.7	$	12,397.6	$	17.4	$	12,415.0	$	4.4
Commercial Real Estate	4,761.5		1.3		—		—		4,762.8		10.2		4,773.0		6.2
Non-U.S.	3,131.1		—		—		—		3,131.1		—		3,131.1		—
Other	1,316.5		—		—		—		1,316.5		—		1,316.5		—
Total Commercial	21,562.8		41.5		3.0		0.7		21,608.0		27.6		21,635.6		10.6
Personal
Private Client	13,843.5		192.3		29.9		53.3		14,119.0		—		14,119.0		—
Residential Real Estate	6,373.2		9.6		12.3		0.1		6,395.2		18.3		6,413.5		18.3
Non-U.S	509.9		—		—		0.1		510.0		—		510.0		—
Other	215.2		—		—		—		215.2		—		215.2		—
Total Personal	20,941.8		201.9		42.2		53.5		21,239.4		18.3		21,257.7		18.3
Total Loans	$	42,504.6	$	243.4	$	45.2	$	54.2	$	42,847.4	$	45.9	$	42,893.3	$	28.9
					Other Real Estate Owned						$	—
					Total Nonaccrual Assets						$	45.9

Interest income that would have been recorded for nonaccrual loans and leases in accordance with their original terms was $3.4 million in 2023, $4.1 million in 2022, and $4.6 million in 2021.

Northern Trust may obtain physical possession of real estate via foreclosure on an in-substance repossession. As of December 31, 2023 and 2022, Northern Trust held foreclosed real estate properties with an immaterial carrying value for both years as a result of obtaining physical possession. In addition, as of December 31, 2023 and 2022, Northern Trust had loans with a carrying value of $3.5 million and $1.1 million, respectively, for which formal foreclosure proceedings were in process.

Loan Modifications to Borrowers Experiencing Financial Difficulty (After the Adoption of Accounting Standards Update No. 2022-02)

The following table shows the amortized cost basis of loan modifications provided to financially distressed borrowers that impacted the respective cash flows of the underlying loans as of December 31, 2023, disaggregated by relevant class of financing receivable and type of modification provided.

TABLE 67: LOAN MODIFICATIONS MADE TO BORROWERS EXPERIENCING FINANCIAL DIFFICULTY

YEAR ENDED DECEMBER 31, 2023
($ In Millions)	LOAN MODIFICATION DETAIL	AMORTIZED COST BASIS		% OF TOTAL SEGMENT
Commercial(1)
Commercial and Institutional	Term extension	$	16.7	0.14	%
Commercial Real Estate	Principal and/or interest deferral	—		—
Commercial Real Estate	Combination of principal and/or interest deferral and term extension	—		—
Total Commercial		$	16.7	0.07	%
Personal(1)
Private Client	Term extension	$	—	—	%
Private Client	Principal and/or interest deferral	18.3		0.13
Residential Real Estate	Principal and/or interest deferral	1.0		0.02
Residential Real Estate	Interest rate concession	—		—
Residential Real Estate	Combination of principal and/or interest deferral and term extension	4.7		0.07
Total Personal		$	24.0	0.11	%
Total Loans		$	40.7	0.09	%

(1) Included are financially distressed modifications for which the respective loans had no amortized cost basis as of December 31, 2023 due to pay-downs or charge-offs.

The following table describes the financial effect of the modifications made to borrowers experiencing financial difficulty.

TABLE 68: FINANCIAL EFFECT OF MODIFICATIONS MADE TO BORROWERS EXPERIENCING FINANCIAL DIFFICULTY

	FINANCIAL EFFECT
PRINCIPAL AND INTEREST DEFERRAL
Commercial
Commercial Real Estate	Northern Trust provided a weighted average of 6 months payment deferrals to borrowers for total deferred principal and interest of $32.5 million.
Personal
Residential Real Estate	Northern Trust provided a weighted average of 14 months payment deferrals to borrowers for immaterial principal and interest deferral amounts.
Private Client	Northern Trust provided payment deferrals to borrowers until collateral sale is executed for total principal and interest of $18.9 million.
TERM EXTENSION
Commercial
Commercial and Institutional	Northern Trust provided weighted average term extension of 12 months.
Commercial Real Estate	Northern Trust provided weighted average term extension of 6 months.
Personal
Residential Real Estate	Northern Trust provided weighted average term extension of 9 months.
Private Client	Northern Trust provided weighted average term extension of 60 months.
INTEREST RATE CONCESSION
Personal
Residential Real Estate	Northern Trust provided a 2% reduction in the weighted average contractual interest rates.

The effectiveness of Northern Trust’s modification efforts is measured by the loans’ respective past-due status under the modified terms as of the end of the period. Of the loans that were modified since the adoption of ASU 2022-02 as of January 1, 2023, and were not performing in accordance with their modified terms and considered past due for purposes of these disclosures as of December 31, 2023, were $4.7 million 30-89 days past due and $16.2 million 90 days and greater past due. As of December 31, 2023, Northern Trust charged-off $2.0 million related to modifications to borrowers experiencing financial difficulty that had been processed since the adoption of ASU 2022-02.

There were no undrawn loan commitments or standby letters of credit issued to financially distressed borrowers for which Northern Trust had modified the payment terms of the loans as of December 31, 2023.

Troubled Debt Restructurings (Prior to the Adoption of Accounting Standard Update No. 2022-02)

Prior to January 1, 2023, a loan that was modified as a concession by Northern Trust or a bankruptcy court resulting from the debtor’s financial difficulties was referred to as a troubled debt restructuring (TDR). All TDRs were reported starting in the calendar year of their restructuring. In subsequent years, a TDR may cease being reported if the loan was modified at a market rate and performed according to the modified terms for at least six payment periods. A loan that was modified at a below market rate returned to accrual status if it satisfied the six-payment-period performance requirement.

The expected credit loss was measured based upon the present value of expected future cash flows, discounted at the effective interest rate based on the original contractual rate. If a loan’s contractual interest rate varied based on subsequent changes in an independent factor, such as an index or rate, the loan’s effective interest rate was calculated based on the factor as it changed over the life of the loan. Northern Trust elected not to project changes in the factor for purposes of estimating expected future cash flows. Further, Northern Trust elected not to adjust the effective interest rate for prepayments. If the loan was collateral dependent, the expected loss was measured based on the fair value of the collateral at the reporting date. If the loan valuation was less than the recorded value of the loan, either an allowance was established or a charge-off was recorded for the difference. Smaller balance (individually less than $1 million) homogeneous loans were collectively evaluated. Northern Trust’s accounting policies for material nonaccrual loans was consistent across all classes of loans.

All loans with TDR modifications were evaluated for additional expected credit losses. The nature and extent of further deterioration in credit quality, including a subsequent default, was considered in the determination of an appropriate level of allowance for credit losses.

Included within nonaccrual loans were $35.3 million of nonaccrual TDRs, and $39.7 million of accrual TDRs as of December 31, 2022. There were $0.2 million of aggregate undrawn loan commitments and standby letters of credit at December 31, 2022, issued to borrowers with TDR modifications of loans.

TDR modifications involved extensions of term, deferrals of principal, interest rate concessions, and other modifications. Other modifications typically reflected other nonstandard terms which Northern Trust would not offer in non-troubled situations.

The following table provides, by segment and class, the number of TDR modifications of loans entered into during the year ended December 31, 2022, and the recorded investments and unpaid principal balances as of December 31, 2022.

TABLE 69: TROUBLED DEBT RESTRUCTURINGS

($ In Millions)	LOAN MODIFICATION DETAIL	NUMBER OF LOANS	RECORDED INVESTMENT		UNPAID PRINCIPAL BALANCE
December 31, 2022
Commercial
Commercial and Institutional	Interest rate concession, extension of term, and other modification	2	$	0.6	$	0.6
Commercial Real Estate	Interest rate concession and other modification	1	31.6		32.5
Total Commercial		3	32.2		33.1
Personal
Residential Real Estate	Interest rate concession, deferrals of principal, extension of term, and other modification	3	0.2		0.2
Private Client	Interest rate concession and extension of term	1	0.4		0.4
Total Personal		4	0.6		0.6
Total Loans		7	$	32.8	$	33.7

Note: Period-end balances reflect all paydowns and charge-offs during the year.

There were no loan TDR modifications during the previous twelve-month period which subsequently had a payment default during the year ended December 31, 2022.

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Allowance for Credit Losses

12 Months Ended

Dec. 31, 2023

Receivables [Abstract]

Allowance for Credit Losses

Allowance for Credit Losses

Allowance and Provision for Credit Losses. The allowance for credit losses—which represents management’s best estimate of lifetime expected credit losses related to various portfolios subject to credit risk, off-balance sheet credit exposures, and specific borrower relationships—is determined by management through a disciplined credit review process. Northern Trust measures expected credit losses of financial assets with similar risk characteristics on a collective basis. A financial asset is measured individually if it does not share similar risk characteristics with other financial assets and the related allowance is determined through an individual evaluation.

Management’s estimates utilized in establishing an appropriate level of allowance for credit losses are not dependent on any single assumption. In determining an appropriate allowance level, management evaluates numerous variables and takes into consideration past events, current conditions, and reasonable and supportable forecasts. The primary forecast provides for continued slow, but steady, economic growth, with inflation, unemployment and interest rates gradually returning to their longer-run norms. An alternative scenario is also considered, which reflects a recession that incorporates the experiences of a wider set of historical economic cycles.

The results of the credit reserve estimation methodology are reviewed quarterly by Northern Trust’s Credit Loss Reserve Committee, which receives input from Financial Risk Management, Treasury, Corporate Finance, the Economic Research Department, and each of Northern Trust’s reporting business units. The Credit Loss Reserve Committee determines the probability weights applied to each forecast approved by Northern Trust’s Macroeconomic Scenario Development Committee, and also reviews and approves qualitative adjustments to the collective allowance in line with Northern Trust’s qualitative adjustment framework.

The following table provides information regarding changes in the total allowance for credit losses.

TABLE 70: CHANGES IN THE ALLOWANCE FOR CREDIT LOSSES

	2023
(In Millions)	LOANS		UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT		HELD TO MATURITY DEBT SECURITIES		OTHER FINANCIAL ASSETS		TOTAL
Balance at Beginning of Period	$	144.3	$	38.5	$	16.0	$	0.8	$	199.6
Charge-Offs	(7.5)		—		(1.2)		—		(8.7)
Recoveries	3.7		—		—		—		3.7
Net Recoveries (Charge-Offs)	(3.8)		—		(1.2)		—		(5.0)
Provision for (Release of) Credit Losses(1)	38.2		(11.6)		(2.1)		0.1		24.6
Balance at End of Period	$	178.7	$	26.9	$	12.7	$	0.9	$	219.2

(1) The table excludes a release of credit reserves of $0.1 million for the year ended December 31, 2023 for AFS debt securities. See further detail in Note 4, “Securities.”

	2022
(In Millions)	LOANS		UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT		HELD TO MATURITY DEBT SECURITIES		OTHER FINANCIAL ASSETS		TOTAL
Balance at Beginning of Period	$	138.4	$	34.1	$	11.2	$	1.0	$	184.7
Charge-Offs	(6.0)		—		—		—		(6.0)
Recoveries	10.2		—		—		—		10.2
Net Recoveries (Charge-Offs)	4.2		—		—		—		4.2
Provision for (Release of) Credit Losses(1)	1.7		4.4		4.8		(0.2)		10.7
Balance at End of Period	$	144.3	$	38.5	$	16.0	$	0.8	$	199.6

(1) The table excludes a provision for credit losses of $1.3 million for the year ended December 31, 2022 for AFS debt securities. See further detail in Note 4, “Securities.”

	2021
(In Millions)	LOANS AND LEASES		UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT		HELD TO MATURITY DEBT SECURITIES		OTHER FINANCIAL ASSETS		TOTAL
Balance at Beginning of Period	190.7		61.1		7.3		0.8		259.9
Charge-Offs	(0.7)		—		—		—		(0.7)
Recoveries	7.0		—		—		—		7.0
Net Recoveries (Charge-Offs)	6.3		—		—		—		6.3
Provision for (Release of) Credit Losses	(58.6)		(27.0)		3.9		0.2		(81.5)
Balance at End of Period	$	138.4	$	34.1	$	11.2	$	1.0	$	184.7

The Provision for Credit Losses, excluding the release of credit reserves for available for sale debt securities of $0.1 million, was a provision of $24.6 million for the year ended December 31, 2023, as compared to a $10.7 million Provision for Credit Losses, excluding the provision for available for sale debt securities of $1.3 million, for the year ended December 31, 2022. The provision for loans was primarily due to an increase in the reserve evaluated on a collective basis, which relates to pooled financial assets sharing similar risk characteristics. The increase was primarily seen in the commercial real estate portfolio, driven by an increase in the size and duration of the portfolio, weaker economic projections for the industry, methodology updates, and credit quality deterioration on a small number of loans during the year ended December 31, 2023. The release of credit reserves in undrawn loan commitments and letters of credit during the year ended December 31, 2023 is primarily in the commercial and institutional portfolio, reflecting a combination of credit quality improvements, an improved macroeconomic outlook for that segment, and methodology updates. There were net charge-offs of $5.0 million during the year ended December 31, 2023, as compared to net recoveries of $4.2 million for the year ended December 31, 2022. For further detail, please see the Allowance for the Loan Portfolio and the Allowance for Held to Maturity Debt Securities Portfolio sections below.

For credit exposure and the associated allowance related to fee receivables, please refer to Note 16, “Revenue from Contracts with Clients.” For information related to the allowance for AFS debt securities, please refer to Note 4, “Securities.” For the allowance pertaining to all other financial assets recognized at amortized cost, which include Due from Banks, Other Central Bank Deposits, Interest Bearing Deposits with Banks, and Other Assets, please refer to the Allowance for Other Financial Assets section within this footnote.

Allowance for the Loan Portfolio. The following table provides information regarding changes in the total allowance for credit losses related to loans, including undrawn loan commitments and standby letters of credit, by segment.

TABLE 71: CHANGES IN THE ALLOWANCE FOR CREDIT LOSSES RELATED TO LOANS

	2023
	LOANS						UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
(In Millions)	COMMERCIAL		PERSONAL		TOTAL		COMMERCIAL		PERSONAL		TOTAL
Balance at Beginning of Period	$	116.2	$	28.1	$	144.3	$	36.3	$	2.2	$	38.5
Charge-Offs	(5.7)		(1.8)		(7.5)		—		—		—
Recoveries	0.2		3.5		3.7		—		—		—
Net Recoveries (Charge-Offs)	(5.5)		1.7		(3.8)		—		—		—
Provision for (Release of) Credit Losses	36.1		2.1		38.2		(11.4)		(0.2)		(11.6)
Balance at End of Period	$	146.8	$	31.9	$	178.7	$	24.9	$	2.0	$	26.9

	2022
	LOANS						UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
(In Millions)	COMMERCIAL		PERSONAL		TOTAL		COMMERCIAL		PERSONAL		TOTAL
Balance at Beginning of Period	$	105.6	$	32.8	$	138.4	$	31.4	$	2.7	$	34.1
Charge-Offs	(5.3)		(0.7)		(6.0)		—		—		—
Recoveries	2.7		7.5		10.2		—		—		—
Net Recoveries (Charge-Offs)	(2.6)		6.8		4.2		—		—		—
Provision for (Release of) Credit Losses	13.2		(11.5)		1.7		4.9		(0.5)		4.4
Balance at End of Period	$	116.2	$	28.1	$	144.3	$	36.3	$	2.2	$	38.5

	2021
	LOANS AND LEASES						UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
(In Millions)	COMMERCIAL		PERSONAL		TOTAL		COMMERCIAL		PERSONAL		TOTAL
Balance at Beginning of Period	$	142.2	$	48.5	$	190.7	$	57.6	$	3.5	$	61.1
Charge-Offs	(0.3)		(0.4)		(0.7)		—		—		—
Recoveries	0.9		6.1		7.0		—		—		—
Net Recoveries (Charge-Offs)	0.6		5.7		6.3		—		—		—
Provision for (Release of) Credit Losses	(37.2)		(21.4)		(58.6)		(26.2)		(0.8)		(27.0)
Balance at End of Period	$	105.6	$	32.8	$	138.4	$	31.4	$	2.7	$	34.1

The following table provides information regarding the recorded investments in loans and the allowance for credit losses for loans and undrawn loan commitments and standby letters of credit by segment as of December 31, 2023 and 2022.

TABLE 72: RECORDED INVESTMENTS IN LOANS

	DECEMBER 31, 2023						DECEMBER 31, 2022
(In Millions)	COMMERCIAL		PERSONAL		TOTAL		COMMERCIAL		PERSONAL		TOTAL
Loans
Evaluated on an Individual Basis	$	33.7	$	62.6	$	96.3	$	63.0	$	46.1	$	109.1
Evaluated on a Collective Basis	25,379.1		22,141.6		47,520.7		21,572.6		21,211.6		42,784.2
Total Loans	25,412.8		22,204.2		47,617.0		21,635.6		21,257.7		42,893.3
Allowance for Credit Losses on Loans
Evaluated on an Individual Basis	11.4		2.0		13.4		10.4		—		10.4
Evaluated on a Collective Basis	135.4		29.9		165.3		105.8		28.1		133.9
Allowance Assigned to Loans	146.8		31.9		178.7		116.2		28.1		144.3
Allowance for Undrawn Loan Commitments and Standby Letters of Credit
Evaluated on an Individual Basis	—		—		—		—		—		—
Evaluated on a Collective Basis	24.9		2.0		26.9		36.3		2.2		38.5
Allowance Assigned to Undrawn Loan Commitments and Standby Letters of Credit	24.9		2.0		26.9		36.3		2.2		38.5
Total Allowance Assigned to Loans and Undrawn Loan Commitments and Standby Letters of Credit	$	171.7	$	33.9	$	205.6	$	152.5	$	30.3	$	182.8

Allowance for Held to Maturity Debt Securities Portfolio. The following table provides information regarding changes in the total allowance for credit losses for HTM debt securities.

TABLE 73: CHANGES IN THE ALLOWANCE FOR CREDIT LOSSES RELATED TO HELD TO MATURITY DEBT SECURITIES

	2023
(In Millions)	CORPORATE DEBT		NON-U.S. GOVERNMENT		SUB-SOVEREIGN, SUPRANATIONAL, AND NON-U.S. AGENCY BONDS		OBLIGATIONS OF STATES AND POLITICAL SUBDIVISIONS(1)		COVERED BONDS		OTHER		TOTAL
Balance at Beginning of Period	$	1.9	$	3.6	$	4.0	$	1.5	$	0.1	$	4.9	$	16.0
Charge-Offs	—		—		—		—		—		(1.2)		(1.2)
Recoveries	—		—		—		—		—		—		—
Net Recoveries (Charge-Offs)	—		—		—		—		—		(1.2)		(1.2)
Provision for (Release of) Credit Losses	(1.0)		(0.1)		(1.8)		(0.3)		—		1.1		(2.1)
Balance at End of Period	$	0.9	$	3.5	$	2.2	$	1.2	$	0.1	$	4.8	$	12.7

(1) The allowance for Obligations of States and Political Subdivisions is related to (non pre-refunded) municipal securities that do not fall under Northern Trust’s zero-loss assumption.

	2022
(In Millions)	CORPORATE DEBT		NON-U.S. GOVERNMENT		SUB-SOVEREIGN, SUPRANATIONAL, AND NON-U.S. AGENCY BONDS		OBLIGATIONS OF STATES AND POLITICAL SUBDIVISIONS(1)		COVERED BONDS		OTHER		TOTAL
Balance at Beginning of Period	$	1.4	$	1.9	$	3.0	$	—	$	0.1	$	4.8	$	11.2
Provision for Credit Losses	0.5		1.7		1.0		1.5		—		0.1		4.8
Balance at End of Period	$	1.9	$	3.6	$	4.0	$	1.5	$	0.1	$	4.9	$	16.0

(1) The allowance for Obligations of States and Political Subdivisions is related to (non pre-refunded) municipal securities that do not fall under Northern Trust’s zero-loss assumption.

	2021
(In Millions)	CORPORATE DEBT		NON-U.S. GOVERNMENT		SUB-SOVEREIGN, SUPRANATIONAL, AND NON-U.S. AGENCY BONDS		OBLIGATIONS OF STATES AND POLITICAL SUBDIVISIONS		COVERED BONDS		OTHER		TOTAL
Balance at Beginning of Period	$	0.8	$	0.2	$	1.2	$	—	$	0.1	$	5.0	$	7.3
Provision for Credit Losses	0.6		1.7		1.8		—		—		(0.2)		3.9
Balance at End of Period	$	1.4	$	1.9	$	3.0	$	—	$	0.1	$	4.8	$	11.2

Allowance for Other Financial Assets. The allowance for Other Financial Assets consists of the allowance for Due from Banks, Other Central Bank Deposits, Interest Bearing Deposits with Banks, and Other Assets. Northern Trust’s portfolio is composed mostly of institutions within the “1 to 3” internal borrower rating category and is expected to exhibit minimal to

modest likelihood of loss. The Allowance for Credit Losses related to Other Financial Assets was $0.9 million and $0.8 million as of December 31, 2023 and 2022, respectively.

Accrued Interest. Accrued interest balances are reported within Other Assets on the consolidated balance sheets. Northern Trust elected not to measure an allowance for credit losses for accrued interest receivables related to its loan and securities portfolios as its policy is to write-off uncollectible accrued interest receivable balances in a timely manner. Accrued interest is written off by reversing interest income during the period the financial asset is moved from an accrual to a nonaccrual status.

The following table provides the amount of accrued interest excluded from the amortized cost basis of the following portfolios.

TABLE 74: ACCRUED INTEREST

(In Millions)	DECEMBER 31, 2023		DECEMBER 31, 2022
Loans	$	241.7	$	203.1
Debt Securities
Held to Maturity	72.0		63.2
Available for Sale	129.2		147.1
Other Financial Assets	86.0		43.8
Total	$	528.9	$	457.2

Accrued interest in 2023 increased compared to 2022, primarily due to higher interest rates. The amount of accrued interest reversed through interest income for loans and securities was immaterial during the years ended 2023 and 2022.

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Concentrations of Credit Risk

12 Months Ended

Dec. 31, 2023

Risks and Uncertainties [Abstract]

Concentrations of Credit Risk

Concentrations of Credit Risk

Concentrations of credit risk exist if a number of borrowers or other counterparties are engaged in similar activities and have similar economic characteristics that would cause their ability to meet contractual obligations to be similarly affected by changes in economic or other conditions. The fact that a credit exposure falls into one of these groups does not necessarily indicate that the credit has a higher than normal degree of credit risk. These groups are: banks and bank holding companies, residential real estate, and commercial real estate.

Banks and Bank Holding Companies. At December 31, 2023, on-balance sheet credit risk to banks and bank holding companies, both U.S. and non-U.S., consisted primarily of Interest-Bearing Deposits with Banks of $1.9 billion, demand balances maintained at correspondent banks of $4.7 billion and Securities Purchased under Agreements to Resell of $0.8 billion. At December 31, 2022, on-balance sheet credit risk to banks and bank holding companies, both U.S. and non-U.S., consisted primarily of Interest-Bearing Deposits with Banks of $1.9 billion, demand balances maintained at correspondent banks of $4.6 billion, and Securities Purchased under Agreements to Resell of $1.1 billion. Credit risk associated with U.S. and non-U.S. banks and bank holding companies deemed to be counterparties by Credit Risk Management is managed by the Capital Markets Credit Committee. Credit limits are established through a review process that includes an internally-prepared financial analysis, use of an internal risk rating system and consideration of external ratings from rating agencies. Northern Trust places deposits with banks that have strong internal and external credit ratings and the average life to maturity of deposits with banks is maintained on a short-term basis in order to respond quickly to changing credit conditions.

Residential Real Estate. Residential real estate loans totaled $6.3 billion at December 31, 2023 and $6.4 billion at December 31, 2022, representing 14% and 16%, respectively, of total U.S. loans. Residential real estate loans consist of traditional first lien mortgages and equity credit lines, which generally require a loan-to-collateral value ratio of 65% to 80% at inception. Revaluations of supporting collateral are obtained upon refinancing or default or when otherwise considered warranted. Collateral revaluations for mortgages are performed by independent third parties. Legally binding undrawn commitments to extend residential real estate credit, which are primarily equity credit lines, totaled $804.2 million and $783.4 million at December 31, 2023 and 2022, respectively. The table below provides additional detail regarding residential real estate loans by geographic region.

TABLE 75: RESIDENTIAL REAL ESTATE LOANS BY GEOGRAPHIC REGION

	DECEMBER 31,
(In Millions)	2023		2022
Residential Real Estate by geographic region:
Florida	$	1,648.1	$	1,603.2
California	1,463.8		1,508.1
Illinois	640.3		686.9
New York	505.4		498.7
Colorado	344.1		364.2
Texas	318.7		312.4
All other(1)	1,406.7		1,440.0
Total Residential Real Estate	$	6,327.1	$	6,413.5

(1) The remainder is distributed throughout the other geographic regions within the U.S. served by Northern Trust.

Commercial Real Estate. In managing its credit exposure, management has defined a commercial real estate loan as one where: (1) the borrower’s principal business activity is the acquisition or the development of real estate for commercial purposes; (2) the principal collateral is real estate held for commercial purposes, and loan repayment is expected to flow from the operation of the property; or (3) the loan repayment is expected to flow from the sale or refinance of real estate as a normal and ongoing part of the business. Unsecured lines of credit to firms or individuals engaged in commercial real estate endeavors are included without regard to the use of loan proceeds. The commercial real estate portfolio consists of commercial mortgages and construction, acquisition and development loans extended primarily to experienced investors well known to Northern Trust. Underwriting standards generally reflect conservative loan-to-value ratios and debt service coverage requirements. Recourse to borrowers through guarantees is also generally required. Commercial mortgage financing is provided for the acquisition or refinancing of income-producing properties. Cash flows from the properties generally are sufficient to amortize the loan. These loans are primarily located in the California, Illinois, Florida, Texas, and New York markets. Construction, acquisition and development loans provide financing for commercial real estate prior to rental income stabilization. The intent is generally that the borrower will sell the project or refinance the loan through a commercial mortgage with Northern Trust or another financial institution upon completion. At December 31, 2023, legally binding commitments to extend credit and standby letters of credit to commercial real estate borrowers totaled $413.0 million and $82.1 million, respectively. At December 31, 2022, legally binding commitments to extend credit and standby letters of credit to commercial real estate borrowers totaled $449.3 million and $69.7 million, respectively.

The table below provides additional detail regarding commercial real estate loan types.

TABLE 76: COMMERCIAL REAL ESTATE LOANS

	DECEMBER 31,
(In Millions)	2023		2022
Commercial Mortgages
Office	$	1,035.1	$	1,054.0
Apartment/ Multi-family	1,633.9		1,392.7
Retail	620.9		572.2
Industrial/ Warehouse	687.1		596.2
Other	575.3		548.0
Total Commercial Mortgages	4,552.3		4,163.1
Construction, Acquisition and Development Loans	581.9		609.9
Total Commercial Real Estate Loans	$	5,134.2	$	4,773.0

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Buildings and Equipment

12 Months Ended

Dec. 31, 2023

Property, Plant and Equipment [Abstract]

Buildings and Equipment

Buildings and Equipment

A summary of Buildings and Equipment is presented in the following table.

TABLE 77: BUILDINGS AND EQUIPMENT

	DECEMBER 31, 2023
(In Millions)	ORIGINAL COST		ACCUMULATED DEPRECIATION		NET BOOK VALUE
Land and Improvements	$	11.5	$	0.3	$	11.2
Buildings	253.1		141.4		111.7
Equipment	536.5		337.5		199.0
Leasehold Improvements	530.0		349.7		180.3
Total Buildings and Equipment	$	1,331.1	$	828.9	$	502.2

	DECEMBER 31, 2022
(In Millions)	ORIGINAL COST		ACCUMULATED DEPRECIATION		NET BOOK VALUE
Land and Improvements	$	11.5	$	0.3	$	11.2
Buildings	224.7		137.7		87.0
Equipment	499.7		281.9		217.8
Leasehold Improvements	514.1		329.6		184.5
Total Buildings and Equipment	$	1,250.0	$	749.5	$	500.5

The charge for depreciation amounted to $115.9 million in 2023, $110.1 million in 2022, and $110.8 million in 2021 on the consolidated statements of income.

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Lease Commitments

12 Months Ended

Dec. 31, 2023

Leases [Abstract]

Lease Commitments

Lease Commitments

As of December 31, 2023, Northern Trust was obligated under a number of non-cancelable operating leases, primarily for real estate. Certain leases contain rent escalation clauses based on market indices, renewal option clauses calling for increased rentals, and rental payments based on usage. There are no restrictions imposed by any lease agreement regarding the payment of dividends, debt financing or Northern Trust entering into further lease agreements.

The components of lease costs for the years ended December 31, 2023 and 2022 were as follows.

TABLE 78: LEASE COST COMPONENTS

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022
Operating Lease Cost	$	109.2	$	104.5
Variable Lease Cost (1)	54.7		82.2
Sublease Income	(2.7)		(2.9)
Total Lease Cost	$	161.2	$	183.8

(1) Variable Lease Cost includes rental payments based on usage, common-area maintenance costs and property taxes.

The following table presents a maturity analysis of lease liabilities as of December 31, 2023.

TABLE 79: MATURITY OF LEASE LIABILITIES

(In Millions)	MATURITY OF LEASE LIABILITIES
2024	$	93.2
2025	100.3
2026	85.5
2027	84.9
2028	72.8
Later Years	393.5
Total Lease Payments	830.2
Less: Imputed Interest	(137.4)
Present Value of Lease Liabilities	$	692.8

As of December 31, 2023, there were no commitments for operating leases in addition to the above that have not yet commenced.

Northern Trust uses its incremental borrowing rate to determine the present value of lease payments for operating leases. Operating lease right-of-use (ROU) assets and lease liabilities may include options to extend or terminate the lease only when it is reasonably certain that Northern Trust will exercise that option. Northern Trust elects not to separate lease and non-lease components of a contract for its real estate leases. The location and amount of ROU assets and lease liabilities recorded on the consolidated balance sheets as of December 31, 2023 and 2022 are presented in the following table.

TABLE 80: LOCATION AND AMOUNT OF LEASE ASSETS AND LIABILITIES

(In Millions)	LOCATION OF LEASE ASSETS AND LEASE LIABILITIES ON THE BALANCE SHEET	DECEMBER 31, 2023		DECEMBER 31, 2022
Assets
Operating Lease Right-of-Use Asset	Other Assets	$	522.8	$	484.8
Liabilities
Operating Lease Liability	Other Liabilities	$	692.8	$	626.2

The weighted-average remaining lease term and weighted-average discount rate applied to leases as of December 31, 2023 and 2022 were as follows:

TABLE 81: WEIGHTED-AVERAGE REMAINING LEASE TERM AND DISCOUNT RATE

	DECEMBER 31, 2023		DECEMBER 31, 2022
Operating Leases
Weighted-Average Remaining Lease Term	10.1 years		9.3 years
Weighted-Average Discount Rate	3.3	%	3.0	%

The following table provides supplemental cash flow information related to leases for the years ended December 31, 2023 and 2022.

TABLE 82: SUPPLEMENTAL CASH FLOW INFORMATION

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022
Supplemental cash flow information
Cash paid for amounts included in the measurement of lease liabilities - operating cash flows	$	91.4	$	70.3
Supplemental non-cash information
Right-of-use assets obtained in exchange for new operating lease liabilities	$	122.6	$	61.0

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Goodwill and Other Intangibles

12 Months Ended

Dec. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangibles

Goodwill and Other Intangibles

Goodwill. Changes by reporting segment in the carrying amount of Goodwill for the years ended December 31, 2023 and 2022, including the effect of foreign exchange rates on non-U.S.-dollar denominated balances, were as follows.

TABLE 83: GOODWILL

(In Millions)	ASSET SERVICING		WEALTH MANAGEMENT		TOTAL
Balance at December 31, 2021	$	625.7	$	80.5	$	706.2
Foreign Exchange Rates	(14.7)		(0.2)		(14.9)
Balance at December 31, 2022	$	611.0	$	80.3	$	691.3
Foreign Exchange Rates	10.9		0.1		11.0
Balance at December 31, 2023	$	621.9	$	80.4	$	702.3

The goodwill impairment test is performed at least annually at the reporting-unit level. The Corporation has determined its reporting units for this purpose to be Asset Servicing and Wealth Management. Goodwill was tested for impairment during the fourth quarter of 2023 using a quantitative assessment in which the estimated fair values of the reporting units are compared to their carrying values. Impairment is deemed to exist if the carrying value of a reporting unit exceeds its estimated fair value. Based upon the quantitative assessments, there were no impairments to goodwill in 2023.

Other Intangible Assets Subject to Amortization. The gross carrying amount and accumulated amortization of other intangible assets subject to amortization as of December 31, 2023 and 2022 were as follows.

TABLE 84: OTHER INTANGIBLE ASSETS

	DECEMBER 31,
(In Millions)	2023		2022
Gross Carrying Amount	$	135.0	$	197.9
Less: Accumulated Amortization	63.4		120.3
Net Book Value	$	71.6	$	77.6

Other intangible assets consist primarily of the value of acquired client relationships and are included in Other Assets on the consolidated balance sheets. Amortization expense related to other intangible assets was $9.3 million, $9.3 million, and $14.8 million for the years ended December 31, 2023, 2022, and 2021, respectively. Amortization for the years 2024, 2025, 2026, 2027, and 2028 is estimated to be $9.5 million, $8.9 million, $8.5 million, $8.3 million, and $7.7 million, respectively.

Capitalized Software. The gross carrying amount and accumulated amortization of capitalized software as of December 31, 2023 and 2022 were as follows.

TABLE 85: CAPITALIZED SOFTWARE

	DECEMBER 31,
(In Millions)	2023		2022
Gross Carrying Amount	$	3,781.7	$	3,479.3
Less: Accumulated Amortization	1,754.2		1,517.4
Net Book Value	$	2,027.5	$	1,961.9

Capitalized software, which is included in Other Assets on the consolidated balance sheets, consists primarily of purchased software, software licenses, and allowable internal costs, including compensation relating to software developed for internal use. Fees paid for the use of software licenses that are not hosted by Northern Trust are expensed as incurred. Amortization expense, which is included in Equipment and Software on the consolidated statements of income, totaled $509.4 million in 2023, $434.2 million in 2022, and $390.1 million in 2021.

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Deposits

12 Months Ended

Dec. 31, 2023

Banking And Thrift, Time Deposits [Abstract]

Deposits

Deposits

The following table provides the scheduled maturity of total time deposits in denominations of $250,000 or greater at December 31, 2023.

TABLE 86: REMAINING MATURITY OF TIME DEPOSITS $250,000 OR MORE

	DECEMBER 31, 2023
	U.S. OFFICE		NON-U.S. OFFICES
(In Millions)	CERTIFICATES OF DEPOSIT		OTHER TIME		TOTAL
1 Year or Less	$	3,394.0	$	2,580.1	$	5,974.1
Over 1 Year to 2 Years	39.3		—		39.3
Over 2 Years to 3 Years	6.7		—		6.7
Over 3 Years to 4 Years	2.1		—		2.1
Over 4 Years to 5 Years	9.9		—		9.9
Over 5 Years	—		—		—
Total	$	3,452.0	$	2,580.1	$	6,032.1

As of December 31, 2022, there were $3,721.8 million of time deposits in denominations of $250,000 or greater, of which $1,697.6 million were Certificates of Deposit and $2,024.2 million were non-U.S.

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Senior Notes and Long-Term Debt

12 Months Ended

Dec. 31, 2023

Debt Disclosure [Abstract]

Senior Notes and Long-Term Debt

Senior Notes and Long-Term Debt

Senior Notes. A summary of Senior Notes outstanding at December 31, 2023 and 2022 is presented in the following table.

TABLE 87: SENIOR NOTES

	DECEMBER 31,
($ In Millions)	RATE		2023		2022
Corporation-Senior Notes
Fixed Rate Due May 2027(1)	4.00	%	$	997.6	$	995.0
Fixed Rate Due Aug. 2028(2)(3)	3.65		483.3		476.6
Fixed Rate Due May 2029(2)(3)	3.15		469.1		460.3
Fixed Rate Due May 2030(2)(3)	1.95		823.2		792.3
Total Senior Notes			$	2,773.2	$	2,724.2

(1) Redeemable within one month of maturity.

(2) Redeemable within three months of maturity.

(3) Interest rate swap contracts were entered into to modify the interest expense from fixed rates to floating rates. The swaps are recorded as fair value hedges and (decreases) increases in the carrying values of senior notes outstanding of $(219.1) million and $(264.7) million were recorded as of December 31, 2023 and 2022, respectively. See further detail in Note 25, “Derivative Financial Instruments.”

Long-Term Debt. A summary of Long-Term Debt, defined as debt with original maturities of one year or more, outstanding at December 31, 2023 and 2022 is presented in the following table. We do not reclassify long-term debt to short-term borrowings within a year of maturity.

TABLE 88: LONG-TERM DEBT

			DECEMBER 31,
($ In Millions)	RATE		2023		2022
Corporation-Subordinated Debt
Fixed Rate Notes due October 2025(1)(2)	3.950	%	$	720.3	$	720.1
Fixed-to-Floating Rate Notes due May 2032(3)	3.375		349.7		349.7
Fixed Rate Notes due November 2032(4)	6.125		995.0		996.4
Total Corporation-Subordinated Debt			$	2,065.0	$	2,066.2
Federal Home Loan Bank (FHLB) Advances
FHLB Fixed Rate Advance due December 2025	5.13	%	$	30.0	$	—
FHLB Fixed Rate Advance due December 2025	5.18		570.0		—
FHLB Fixed Rate Advance due March 2026	5.13		600.0		—
FHLB Fixed Rate Advance due June 2026	5.09		800.0		—
Total FHLB Advances			$	2,000.0	$	—
Total Long-Term Debt			$	4,065.0	$	2,066.2
Long-Term Debt Qualifying as Risk-Based Capital			$	1,490.8	$	1,648.5

(1) Not redeemable prior to maturity.

(2) Interest rate swap contracts were entered into to modify the interest expense from fixed rates to floating rates. The swaps are recorded as fair value hedges and (decreases) increases in the carrying values of the subordinated notes outstanding of $(29.3) million were recorded as of December 31, 2022. See further detail in Note 25, “Derivative Financial Instruments.” There were no swaps as of December 31, 2023 as the fair value hedge was discontinued.

(3) The subordinated notes will bear interest from the date they were issued to, but excluding, May 8, 2027, at an annual rate of 3.375%, payable semi-annually in arrears. Effective February 27, 2023, the Board of Governors of the Federal Reserve adopted a final rule to implement the Adjustable Interest Rate (LIBOR) Act (the “LIBOR Act”). The final rule establishes benchmark replacements for contracts governed by U.S. law that reference certain tenors of U.S. dollar LIBOR after June 30, 2023. Pursuant to the final rule, three-month LIBOR will be replaced by the three-month CME Term SOFR Reference Rate, as administered by CME Group Benchmark Administration, Ltd. (“three-month CME Term SOFR”) plus the statutory spread adjustment of 0.26161% as set forth in the final rule. As a result, from, and including, May 8, 2027, the subordinated notes will bear interest at an annual rate equal to three-month CME Term SOFR plus 0.26161% plus 1.131%, payable quarterly in arrears. The subordinated notes are unsecured and may be redeemed, in whole but not in part, on, and only on, May 8, 2027, at a redemption price equal to 100% of the principal amount of the subordinated notes to be redeemed, plus accrued and unpaid interest, if any, up to but excluding the redemption date.

(4) Redeemable within three months of maturity.

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Stockholders' Equity

12 Months Ended

Dec. 31, 2023

Equity [Abstract]

Stockholders' Equity

Stockholders’ Equity

Preferred Stock. The Corporation is authorized to issue 10 million shares of preferred stock without par value. The Board of Directors is authorized to fix the particular designations, preferences and relative, participating, optional and other special rights and qualifications, limitations or restrictions for each series of preferred stock issued.

As of December 31, 2023, 5,000 shares of Series D Non-Cumulative Perpetual Preferred Stock (“Series D Preferred Stock”) and 16,000 shares of Series E Non-Cumulative Perpetual Preferred Stock (“Series E Preferred Stock”) were outstanding.

Series D Preferred Stock. As of December 31, 2023, the Corporation had issued and outstanding 500,000 depositary shares, each representing a 1/100th ownership interest in a share of Series D Preferred Stock, issued in August 2016. Equity related to Series D Preferred Stock as of December 31, 2023 and 2022 was $493.5 million. Shares of the Series D Preferred Stock have no par value and a liquidation preference of $100,000 per share (equivalent to $1,000 per depositary share).

Dividends on the Series D Preferred Stock, which are not mandatory, accrue and are payable on the liquidation preference amount, on a non-cumulative basis, at a rate per annum equal to (i) 4.60% from the original issue date of the Series D Preferred Stock to but excluding October 1, 2026; and (ii) a floating rate equal to three-month CME Term SOFR, plus a statutory spread adjustment of 0.26161% (as set forth in the final rule to implement the LIBOR Act) plus 3.202% from and including October 1, 2026. Fixed rate dividends are payable in arrears on the first day of April and October of each year, through and including October 1, 2026, and floating rate dividends will be payable in arrears on the first day of January, April, July and October of each year, commencing on January 1, 2027.

The Series D Preferred Stock has no maturity date and is redeemable at the Corporation’s option in whole, or in part, on any dividend payment date on or after October 1, 2026. The Series D Preferred Stock is redeemable at the Corporation’s option in whole, but not in part, including prior to October 1, 2026, within 90 days of a regulatory capital treatment event, as described in the Series D Preferred Stock Certificate of Designation.

Shares of the Series D Preferred Stock rank senior to the Corporation’s common stock, and will rank at least equally with any other series of preferred stock it may issue (except for any senior series that may be issued with the requisite consent of the holders of the Series D Preferred Stock) and all other parity stock, with respect to the payment of dividends and distributions upon liquidation, dissolution or winding up.

Series E Preferred Stock. As of December 31, 2023, the Corporation had issued and outstanding 16 million depositary shares, each representing 1/1,000th ownership interest in a share of Series E Preferred Stock, issued in November 2019. Equity related to Series E Preferred Stock as of December 31, 2023 and 2022 was $391.4 million. Shares of the Series E Preferred Stock have no par value and a liquidation preference of $25,000 per share (equivalent to $25 per depositary share).

Dividends on the Series E Preferred Stock, which are not mandatory, accrue and are payable on the liquidation preference amount, on a non-cumulative basis, quarterly in arrears on the first day of January, April, July and October of each year, at a rate per annum equal to 4.70%. On October 17, 2023, the Corporation declared a cash dividend of $293.75 per share of Series E Preferred Stock payable on January 1, 2024, to stockholders of record as of December 15, 2023.

The Series E Preferred Stock has no maturity date and is redeemable at the Corporation’s option in whole, or in part, on any dividend payment date on or after January 1, 2025. The Series E Preferred Stock is redeemable at the Corporation’s option in whole, but not in part, including prior to January 1, 2025, within 90 days of a regulatory capital treatment event, as described in the Series E Preferred Stock Certificate of Designation.

Shares of the Series E Preferred Stock rank senior to the Corporation’s common stock, and will rank at least equally with any other series of preferred stock it may issue (except for any senior series that may be issued with the requisite consent of the holders of the Series E Preferred Stock) and all other parity stock, with respect to the payment of dividends and distributions upon liquidation, dissolution or winding up.

Common Stock. The Corporation’s current stock repurchase authorization to repurchase up to 25.0 million shares was approved by the Board of Directors in October 2021. Shares are repurchased by the Corporation to, among other things, manage the Corporation’s capital levels. Repurchased shares are used for general purposes, including the issuance of shares under stock option and other incentive plans. The repurchase authorization approved by the Board of Directors has no expiration date. During the year ended December 31, 2023, the Corporation repurchased 4,384,678 shares of common stock, including 378,130 shares withheld to satisfy tax withholding obligations related to share-based compensation, at a total cost of $347.5 million. During the year ended December 31, 2022, the Corporation repurchased 311,536 shares of common stock, all of which were shares withheld to satisfy tax withholding obligations related to share-based compensation, at a total cost of $35.4 million. During the year ended December 31, 2021, the Corporation repurchased 2,527,544 shares of common stock, including 394,326 shares withheld to satisfy tax withholding obligations related to share-based compensation, at a total cost of $267.6 million. The 2021 purchase was made pursuant to the repurchase program authorized by the Board of Directors in July 2018.

The average price paid per share for common stock repurchased in 2023, 2022, and 2021 was $79.26, $113.70, and $105.90, respectively.

An analysis of changes in the number of shares of common stock outstanding follows:

TABLE 89: SHARES OF COMMON STOCK

	2023	2022	2021
Balance at January 1	208,428,309	207,761,875	208,289,178
Incentive Plan and Awards	1,040,450	914,404	1,162,484
Stock Options Exercised	42,143	63,566	837,757
Treasury Stock Purchased	(4,384,678)	(311,536)	(2,527,544)
Balance at December 31	205,126,224	208,428,309	207,761,875

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Accumulated Other Comprehensive Income (Loss)

12 Months Ended

Dec. 31, 2023

Equity [Abstract]

Accumulated Other Comprehensive Income (Loss)

Accumulated Other Comprehensive Income (Loss)

The following tables summarize the components of Accumulated Other Comprehensive Income (Loss) (AOCI) at December 31, 2023, 2022, and 2021, and changes during the years then ended.

TABLE 90: SUMMARY OF CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

(In Millions)	NET UNREALIZED GAINS (LOSSES) ON AVAILABLE FOR SALE DEBT SECURITIES(1)		NET UNREALIZED (LOSSES) GAINS ON CASH FLOW HEDGES		NET FOREIGN CURRENCY ADJUSTMENT		NET PENSION AND OTHER POSTRETIREMENT BENEFIT ADJUSTMENTS		TOTAL
Balance at December 31, 2020	$	641.8	$	(3.2)	$	144.7	$	(355.3)	$	428.0
Net Change	(534.7)		0.8		10.5		59.8		(463.6)
Balance at December 31, 2021	$	107.1	$	(2.4)	$	155.2	$	(295.5)	$	(35.6)
Net Change	(1,474.7)		3.6		9.4		(71.9)		(1,533.6)
Balance at December 31, 2022	$	(1,367.6)	$	1.2	$	164.6	$	(367.4)	$	(1,569.2)
Net Change	443.7		(0.4)		39.0		(51.0)		431.3
Balance at December 31, 2023	$	(923.9)	$	0.8	$	203.6	$	(418.4)	$	(1,137.9)

(1) Includes net unrealized gains (losses) on debt securities transferred from AFS to HTM. Refer to Note 4, “Securities” for further information.

TABLE 91: DETAILS OF CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

FOR THE YEAR ENDED DECEMBER 31,	2023						2022						2021
(In Millions)	PRE-TAX		TAX		AFTER TAX		PRE-TAX		TAX		AFTER TAX		PRE-TAX		TAX		AFTER TAX
Unrealized Gains (Losses) on Available for Sale Debt Securities
Unrealized Gains (Losses) on Available for Sale Debt Securities	$	319.4	$	(81.1)	$	238.3	$	(2,263.8)	$	580.2	$	(1,683.6)	$	(685.0)	$	177.5	$	(507.5)
Reclassification Adjustments for Losses (Gains) Included in Net Income:
Interest Income on Debt Securities(1)	105.6		(26.7)		78.9		65.1		(16.4)		48.7		(36.6)		9.2		(27.4)
Net Losses on Debt Securities(2)	169.5		(43.0)		126.5		214.0		(53.8)		160.2		0.3		(0.1)		0.2
Net Change	$	594.5	$	(150.8)	$	443.7	$	(1,984.7)	$	510.0	$	(1,474.7)	$	(721.3)	$	186.6	$	(534.7)
Unrealized (Losses) Gains on Cash Flow Hedges
Foreign Exchange Contracts	$	36.3	$	(9.2)	$	27.1	$	1.0	$	(0.3)	$	0.7	$	5.6	$	(1.4)	$	4.2
Reclassification Adjustment for (Gains) Losses Included in Net Income(3)	(36.8)		9.3		(27.5)		3.7		(0.8)		2.9		(4.5)		1.1		(3.4)
Net Change	$	(0.5)	$	0.1	$	(0.4)	$	4.7	$	(1.1)	$	3.6	$	1.1	$	(0.3)	$	0.8
Foreign Currency Adjustments
Foreign Currency Translation Adjustments	$	100.8	$	(1.6)	$	99.2	$	(200.1)	$	3.0	$	(197.1)	$	(133.8)	$	4.1	$	(129.7)
Long-Term Intra-Entity Foreign Currency Transaction (Losses) Gains	(0.9)		0.2		(0.7)		(2.6)		0.7		(1.9)		0.6		(0.1)		0.5
Net Investment Hedge Gains (Losses)	(77.4)		17.9		(59.5)		278.7		(70.3)		208.4		186.6		(46.9)		139.7
Net Change	$	22.5	$	16.5	$	39.0	$	76.0	$	(66.6)	$	9.4	$	53.4	$	(42.9)	$	10.5
Pension and Other Postretirement Benefit Adjustments
Net Actuarial (Losses) Gains	$	(71.4)	$	15.7	$	(55.7)	$	(163.9)	$	44.7	$	(119.2)	$	7.9	$	0.2	$	8.1
Reclassification Adjustment for Losses (Gains) Included in Net Income(4)
Amortization of Net Actuarial Loss	6.4		(1.7)		4.7		19.1		(4.7)		14.4		41.4		(10.3)		31.1
Amortization of Prior Service Cost (Credit)	—		—		—		(1.0)		0.3		(0.7)		(1.0)		0.3		(0.7)
Settlement Loss	—		—		—		44.9		(11.3)		33.6		28.3		(7.0)		21.3
Net Change	$	(65.0)	$	14.0	$	(51.0)	$	(100.9)	$	29.0	$	(71.9)	$	76.6	$	(16.8)	$	59.8
Total Net Change	$	551.5	$	(120.2)	$	431.3	$	(2,004.9)	$	471.3	$	(1,533.6)	$	(590.2)	$	126.6	$	(463.6)

(1) The before-tax reclassification adjustment is related to the unrealized gains (losses) amortization on AFS debt securities that were transferred to HTM debt securities during the second quarter of 2021 and third quarter of 2022. Refer to Note 4, “Securities” for further information.

(2) The net losses on AFS debt securities before-tax reclassification adjustment is recorded in Investment Security Gains (Losses), net on the consolidated statements of income. Refer to Note 4, “Securities” for further information.

(3) See Note 25, "Derivative Financial Instruments" for the location of the reclassification adjustment related to cash flow hedges.

(4) The pension and other postretirement benefit before-tax reclassification adjustment is recorded in Employee Benefits expense on the consolidated statements of income.

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Net Income per Common Share

12 Months Ended

Dec. 31, 2023

Earnings Per Share [Abstract]

Net Income per Common Share

Net Income per Common Share

The computations of net income per common share are presented in the following table.

TABLE 92: NET INCOME PER COMMON SHARE

	FOR THE YEAR ENDED DECEMBER 31,
($ In Millions Except Per Common Share Information)	2023		2022		2021
BASIC NET INCOME PER COMMON SHARE
Average Number of Common Shares Outstanding	207,248,094		208,309,331		208,075,522
Net Income	$	1,107.3	$	1,336.0	$	1,545.3
Less: Dividends on Preferred Stock	41.8		41.8		41.8
Net Income Applicable to Common Stock	1,065.5		1,294.2		1,503.5
Less: Earnings Allocated to Participating Securities	11.6		11.8		12.9
Earnings Allocated to Common Shares Outstanding	$	1,053.9	$	1,282.4	$	1,490.6
Basic Net Income Per Common Share	5.09		6.16		7.16
DILUTED NET INCOME PER COMMON SHARE
Average Number of Common Shares Outstanding	207,248,094		208,309,331		208,075,522
Plus Dilutive Effect of Share-based Compensation	315,652		557,933		823,708
Average Common and Potential Common Shares	207,563,746		208,867,264		208,899,230
Earnings Allocated to Common and Potential Common Shares	$	1,053.9	$	1,282.4	$	1,490.6
Diluted Net Income Per Common Share	5.08		6.14		7.14

Note: Common stock equivalents of 0.1 million for the year ended December 31, 2023, were not included in the computation of diluted net income per common share because their inclusion would have been antidilutive. For the years ended December 31, 2022 and 2021, respectively, there were de minimis and no common stock equivalents excluded in the computation of diluted net income per share.

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Revenue from Contracts with Clients

12 Months Ended

Dec. 31, 2023

Revenue from Contract with Customer [Abstract]

Revenue from Contracts with Clients

Revenue from Contracts with Clients

Trust, Investment, and Other Servicing Fees. Custody and Fund Administration income is comprised of revenues received from our core asset servicing business for providing custody, fund administration, and middle-office-related services, primarily to Asset Servicing clients. Investment Management and Advisory income contains revenue received from providing asset management and related services to Wealth Management and Asset Servicing clients and to Northern Trust sponsored funds. Securities Lending income represents revenues generated from securities lending arrangements that Northern Trust enters into as agent, mainly with Asset Servicing clients. Other income largely consists of revenues received from providing employee benefit, investment risk and analytic and other services to Asset Servicing and Wealth Management clients.

Other Noninterest Income. Treasury Management income represents revenues received from providing cash and liquidity management services to Asset Servicing and Wealth Management clients. The portion of Security Commissions and Trading Income that relates to revenue from contracts with clients is primarily comprised of commissions earned from providing securities brokerage services to Wealth Management and Asset Servicing clients. The portion of Other Operating Income that relates to revenue from contracts with clients is mainly comprised of service fees for banking-related services provided to Wealth Management and Asset Servicing clients.

Performance Obligations. Clients are typically charged monthly or quarterly in arrears based on the fee arrangement agreed to with each client; payment terms will vary depending on the client and services offered.

Substantially all revenues generated from contracts with clients for asset servicing, asset management, securities lending, treasury management and banking-related services are recognized on an accrual basis, over the period in which services are provided. The nature of Northern Trust’s performance obligations is to provide a series of distinct services in which the customer simultaneously receives and consumes the benefits of the promised services as they are performed. Fee arrangements are mainly comprised of variable amounts based on market value of client assets managed and serviced, transaction volumes, number of accounts, and securities lending volume and spreads. Revenue is recognized using the output method in an amount that reflects the consideration to which Northern Trust expects to be entitled in exchange for providing each month or quarter of service. For contracts with multiple performance obligations, revenue is allocated to each performance obligation based on the price agreed to with the client, representing its relative standalone selling price.

Security brokerage revenue is primarily represented by securities commissions received in exchange for providing trade execution related services. Control is transferred at a point in time, on the trade date of the transaction, and fees are typically variable based on transaction volumes and security types.

Northern Trust’s contracts with its clients are typically open-ended arrangements and are therefore considered to have an original duration of less than one year. Northern Trust has elected the practical expedient to not disclose the value of remaining performance obligations for contracts with an original expected duration of one year or less.

The following table presents revenues disaggregated by major revenue source.

TABLE 93: REVENUE DISAGGREGATION

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Noninterest Income
Trust, Investment and Other Servicing Fees
Custody and Fund Administration	$	1,805.3	$	1,816.0	$	1,917.5
Investment Management and Advisory	2,232.3		2,299.1		2,140.0
Securities Lending	83.9		81.6		76.9
Other	240.3		235.9		226.7
Total Trust, Investment and Other Servicing Fees	$	4,361.8	$	4,432.6	$	4,361.1
Other Noninterest Income
Foreign Exchange Trading Income	$	203.9	$	288.6	$	292.6
Treasury Management Fees	31.6		39.3		44.3
Security Commissions and Trading Income	135.0		136.2		140.2
Other Operating Income	228.7		191.3		243.9
Investment Security Gains (Losses), net	(169.5)		(214.0)		(0.3)
Total Other Noninterest Income	$	429.7	$	441.4	$	720.7
Total Noninterest Income	$	4,791.5	$	4,874.0	$	5,081.8

On the consolidated statements of income, Trust, Investment and Other Servicing Fees and Treasury Management Fees represent revenue from contracts with clients. For the year ended December 31, 2023, revenue from contracts with clients also includes $115.9 million of the $135.0 million total Security Commissions and Trading Income and $38.9 million of the $228.7 million total Other Operating Income. For the year ended December 31, 2022, revenue from contracts with clients also includes $116.8 million of the $136.2 million total Security Commissions and Trading Income and $37.2 million of the $191.3 million total Other Operating Income. For the year ended December 31, 2021, revenue from contracts with clients also includes $112.1 million of the $140.2 million total Security Commissions and Trading Income and $53.9 million of the $243.9 million total Other Operating Income.

Receivables Balances. The following table represents receivables balances from contracts with clients, which are included in Other Assets on the consolidated balance sheets, at December 31, 2023 and 2022.

TABLE 94: CLIENT RECEIVABLES

	DECEMBER 31,
(In Millions)	2023		2022
Trust Fees Receivable, net(1)	$	863.5	$	882.5
Other	64.9		55.4
Total Client Receivables	$	928.4	$	937.9

(1)Trust Fees Receivable is net of a $15.9 million and $13.5 million fee receivable allowance as of December 31, 2023 and 2022, respectively.

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Net Interest Income

12 Months Ended

Dec. 31, 2023

Banking and Thrift, Interest [Abstract]

Net Interest Income

Net Interest Income

The components of Net Interest Income were as follows.

TABLE 95: NET INTEREST INCOME

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Interest Income
Federal Reserve and Other Central Bank Deposits	$	1,462.3	$	472.0	$	11.3
Interest-Bearing Due from and Deposits with Banks(1)	130.1		46.6		9.1
Federal Funds Sold	0.3		0.1		—
Securities Purchased under Agreements to Resell	1,585.2		103.7		3.5
Securities – Taxable	1,534.4		899.9		658.8
– Nontaxable(2)	1.3		1.3		1.5
Loans and Leases	2,551.1		1,344.3		713.5
Other Interest-Earning Assets(3)	60.3		9.8		8.8
Total Interest Income	$	7,325.0	$	2,877.7	$	1,406.5
Interest Expense
Deposits	$	2,685.3	$	602.8	$	(61.3)
Federal Funds Purchased	256.9		34.1		(0.4)
Securities Sold under Agreements to Repurchase	1,541.1		90.7		0.2
Other Borrowings	542.5		126.2		14.2
Senior Notes	170.0		92.7		48.3
Long-Term Debt	147.2		44.0		21.1
Floating Rate Capital Debt	—		—		1.7
Total Interest Expense	$	5,343.0	$	990.5	$	23.8
Net Interest Income	$	1,982.0	$	1,887.2	$	1,382.7

(1) Interest-Bearing Due from and Deposits with Banks includes the interest-bearing component of Cash and Due from Banks and Interest-Bearing Deposits with Banks as presented on the consolidated balance sheets.

(2) Non-taxable Securities represent securities that are exempt from U.S. federal income taxes.

(3) Other Interest-Earning Assets include certain community development investments, collateral deposits with certain securities depositories and clearing houses, Federal Home Loan Bank and Federal Reserve stock, and money market investments which are classified in Other Assets on the consolidated balance sheets.

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Other Operating Income

12 Months Ended

Dec. 31, 2023

Other Income and Expenses [Abstract]

Other Operating Income

Other Operating Income

The components of Other Operating Income were as follows.

TABLE 96: OTHER OPERATING INCOME

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Loan Service Fees	$	83.1	$	71.5	$	66.6
Banking Service Fees	53.0		49.8		50.9
Bank Owned Life Insurance	69.5		61.0		48.5
Other Income(1)	23.1		9.0		77.9
Total Other Operating Income	$	228.7	$	191.3	$	243.9

(1) Other Income includes the mark-to-market gain or loss on derivative swap activity primarily related to the sale of certain Visa Class B common shares.

Other Operating Expense

The components of Other Operating Expense were as follows.

TABLE 97: OTHER OPERATING EXPENSE

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Business Promotion	$	74.8	$	76.7	$	65.5
Staff Related	35.0		34.6		33.9
FDIC Insurance Premiums(1)	112.0		17.8		14.6
Charitable Contributions	15.6		19.4		18.0
Other Expenses	235.5		210.8		167.1
Total Other Operating Expense	$	472.9	$	359.3	$	299.1

(1) FDIC Insurance Premiums include the $84.6 million FDIC special assessment for the year ended December 31, 2023. This line also reflects an initial base deposit insurance assessment rate increase which began in the first quarterly assessment period of 2023.

In November 2023, the FDIC issued a final rule to implement a special assessment to recoup losses to the Deposit Insurance Fund associated with bank failures in the first half of 2023. Under the final rule, the assessment base for the special assessment is equal to an insured depository institution’s estimated uninsured domestic office deposits reported as of December 31, 2022, adjusted to exclude the first $5 billion of uninsured domestic office deposits. The final rule provides that the FDIC will collect the special assessment at a quarterly rate of 3.36 basis points over eight quarterly assessment periods, subject to change depending on any adjustments to the loss estimate, mergers, failures, or amendments to reported estimates of uninsured deposits. In conjunction with the special assessment, $84.6 million was recognized as an accrued liability and related expense in the fourth quarter of 2023. The final rule becomes effective on April 1, 2024, and the first collection, including any adjustments as described above, will be reflected on the invoice for the first quarterly assessment period of 2024, with the first payment due on June 28, 2024.

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Other Operating Expense

12 Months Ended

Dec. 31, 2023

Other Income and Expenses [Abstract]

Other Operating Expense

Other Operating Income

The components of Other Operating Income were as follows.

TABLE 96: OTHER OPERATING INCOME

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Loan Service Fees	$	83.1	$	71.5	$	66.6
Banking Service Fees	53.0		49.8		50.9
Bank Owned Life Insurance	69.5		61.0		48.5
Other Income(1)	23.1		9.0		77.9
Total Other Operating Income	$	228.7	$	191.3	$	243.9

(1) Other Income includes the mark-to-market gain or loss on derivative swap activity primarily related to the sale of certain Visa Class B common shares.

Other Operating Expense

The components of Other Operating Expense were as follows.

TABLE 97: OTHER OPERATING EXPENSE

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Business Promotion	$	74.8	$	76.7	$	65.5
Staff Related	35.0		34.6		33.9
FDIC Insurance Premiums(1)	112.0		17.8		14.6
Charitable Contributions	15.6		19.4		18.0
Other Expenses	235.5		210.8		167.1
Total Other Operating Expense	$	472.9	$	359.3	$	299.1

(1) FDIC Insurance Premiums include the $84.6 million FDIC special assessment for the year ended December 31, 2023. This line also reflects an initial base deposit insurance assessment rate increase which began in the first quarterly assessment period of 2023.

In November 2023, the FDIC issued a final rule to implement a special assessment to recoup losses to the Deposit Insurance Fund associated with bank failures in the first half of 2023. Under the final rule, the assessment base for the special assessment is equal to an insured depository institution’s estimated uninsured domestic office deposits reported as of December 31, 2022, adjusted to exclude the first $5 billion of uninsured domestic office deposits. The final rule provides that the FDIC will collect the special assessment at a quarterly rate of 3.36 basis points over eight quarterly assessment periods, subject to change depending on any adjustments to the loss estimate, mergers, failures, or amendments to reported estimates of uninsured deposits. In conjunction with the special assessment, $84.6 million was recognized as an accrued liability and related expense in the fourth quarter of 2023. The final rule becomes effective on April 1, 2024, and the first collection, including any adjustments as described above, will be reflected on the invoice for the first quarterly assessment period of 2024, with the first payment due on June 28, 2024.

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Income Taxes

12 Months Ended

Dec. 31, 2023

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The following table reconciles the statutory federal tax rate with the effective tax rate for the periods presented below.

TABLE 98: INCOME TAXES

	FOR THE YEAR ENDED DECEMBER 31,
	2023		2022		2021
Statutory Federal Tax Rate	21.0	%	21.0	%	21.0	%
State Taxes, net	3.4		3.3		3.4
Foreign Tax Rate Differential	0.6		0.1		0.1
Excess Tax Benefit Related to Share-Based Compensation	(0.1)		(0.2)		(0.4)
Tax Credits	(2.7)		(2.0)		(1.6)
Tax Exempt Income	(1.4)		(0.9)		(0.6)
Valuation Allowance	1.8		1.5		0.6
Other, net	1.8		1.6		0.6
Effective Tax Rate	24.4	%	24.4	%	23.1	%

Income tax expense for the year ended December 31, 2023, 2022, and 2021 was $357.5 million, $430.3 million, and $464.8 million, representing an effective tax rate of 24.4%, 24.4%, and 23.1% respectively.

For the year ended December 31, 2022, the increase in the effective tax rate was primarily driven by a higher net impact from international operations, including limitations on the U.S. foreign tax credit and reserves for uncertain tax positions, partially offset by increased tax benefits from tax-credit investments and tax-exempt income.

For the year ended December 31, 2021, the decrease in the effective tax rate was primarily driven by the lower net tax impact from international operations and $26.8 million of prior-year tax expense related to the reversal of tax benefits previously recognized through earnings.

The Corporation files income tax returns in the U.S. federal, various state, and foreign jurisdictions. The Corporation is no longer subject to income tax examinations by U.S. federal authorities before 2015, U.S. state or local tax authorities for years before 2011, or non-U.S. tax authorities for years before 2014.

Included in Other Liabilities on the consolidated balance sheets at December 31, 2023 and 2022 were $60.7 million and $40.7 million of unrecognized tax benefits, respectively. If recognized, the amounts would reduce 2023 and 2022 income tax expense by $54.4 million and $37.4 million, respectively. A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows.

TABLE 99: UNRECOGNIZED TAX BENEFITS

(In Millions)	2023		2022		2021
Balance at January 1	$	40.7	$	25.3	$	22.4
Additions for Tax Positions Taken in the Current Year	2.1		1.7		1.2
Additions for Tax Positions Taken in Prior Years	24.0		13.7		4.2
Reductions for Tax Positions Taken in Prior Years	(5.1)		—		(2.5)
Reductions Resulting from Expiration of Statutes	(1.0)		—		—
Balance at December 31	$	60.7	$	40.7	$	25.3

It is possible that changes in the amount of unrecognized tax benefits could occur in the next 12 months due to changes in judgment related to recognition or measurement, settlements with taxing authorities, or expiration of statute of limitations. Management does not believe that future changes, if any, would have a material effect on the consolidated financial position or liquidity of Northern Trust, although they could have a material effect on operating results for a particular period.

A provision for interest and penalties of $0.2 million, net of tax, was included in the Provision for Income Taxes for the year ended December 31, 2023. This compares to a provision for interest and penalties of $11.1 million, net of tax, and a benefit of $0.4 million, net of tax, for the year ended December 31, 2022 and 2021, respectively. As of December 31, 2023 and 2022, the liability for the potential payment of interest and penalties totaled $22.7 million and $22.2 million, net of tax, respectively.

The components of the consolidated Provision for Income Taxes for each of the three years ended December 31 are as follows.

TABLE 100: PROVISION FOR INCOME TAXES

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Current Tax Provision:
Federal	$	250.5	$	357.7	$	241.5
State	63.2		84.7		74.0
Non-U.S.	92.0		130.6		147.3
Total	$	405.7	$	573.0	$	462.8
Deferred Tax Provision:
Federal	$	(54.0)	$	(126.0)	$	(11.7)
State	(1.4)		(10.7)		12.0
Non-U.S.	7.2		(6.0)		1.7
Total	$	(48.2)	$	(142.7)	$	2.0
Provision for Income Taxes	$	357.5	$	430.3	$	464.8

In addition to the amounts shown above, tax charges (benefits) have been recorded directly to Stockholders’ Equity for the following. For further detail, refer to Note 14, “Accumulated Other Comprehensive Income (Loss).”

TABLE 101: TAX CHARGES (BENEFITS) RECORDED DIRECTLY TO STOCKHOLDERS’ EQUITY

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Tax Effect of Other Comprehensive Income	$	120.2	$	(471.3)	$	(126.6)

Deferred taxes result from temporary differences between the amounts reported on the consolidated financial statements and the tax bases of assets and liabilities. Deferred tax assets and liabilities have been computed as follows.

TABLE 102: DEFERRED TAX ASSETS AND LIABILITIES

	DECEMBER 31,
(In Millions)	2023		2022
Deferred Tax Liabilities:
Software Development	394.9		354.7
Depreciation and Amortization	23.9		122.6
Compensation and Benefits	—		5.2
State Taxes, net	46.8		58.3
Other Liabilities	53.4		42.1
Gross Deferred Tax Liabilities	519.0		582.9
Deferred Tax Assets:
Allowance for Credit Losses	46.2		41.8
Unrealized Losses on Securities, net	244.6		427.3
Compensation and Benefits	70.2		—
Tax Credit and Loss Carryforwards	121.2		95.3
Other Assets	116.0		143.7
Gross Deferred Tax Assets	598.2		708.1
Valuation Reserve	(121.2)		(95.3)
Deferred Tax Assets, net of Valuation Reserve	477.0		612.8
Net Deferred Tax Assets (Liabilities)	$	(42.0)	$	29.9

The Corporation generated a foreign tax credit carryforward during the years ended December 31, 2023 and 2022, expiring in 2033 and 2032, respectively. A cumulative valuation allowance related to the credit carryforward of $120.7 million and $94.9 million was recorded at December 31, 2023 and 2022, respectively, as management believes the foreign tax credit carryforwards will not be fully realized.

Northern Trust had various state net operating loss carryforwards as of December 31, 2023 and 2022. The income tax benefits associated with these loss carryforwards were approximately $0.4 million and $0.4 million as of December 31, 2023 and 2022, respectively. A valuation allowance related to the loss carryforwards of $0.4 million and $0.4 million was recorded at December 31, 2023 and 2022, respectively, as management believes the net operating losses will not be fully realized.

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Employee Benefits

12 Months Ended

Dec. 31, 2023

Retirement Benefits [Abstract]

Employee Benefits

Employee Benefits

The Corporation and certain of its subsidiaries provide various benefit programs, including defined benefit pension and defined contribution plans. A description of each major plan and related disclosures are provided below.

Pension. A noncontributory qualified defined benefit pension plan covers substantially all U.S. employees of Northern Trust. Employees of certain European subsidiaries retain benefits in local defined benefit plans, although those plans are closed to new participants and to future benefit accruals. Employees continue to accrue benefits under the Swiss pension plan, which is accounted for as a defined benefit plan under U.S. GAAP.

Northern Trust also maintains a noncontributory supplemental pension plan for participants whose retirement benefits under the U.S. Qualified Plan are expected to exceed the limits imposed by federal tax law. Northern Trust has a nonqualified trust, referred to as a “Rabbi” Trust, used to hold assets designated for the funding of benefits in excess of those permitted in certain of its qualified retirement plans. This arrangement offers participants a degree of assurance for payment of benefits in excess of those permitted in the related qualified plans. As the “Rabbi” Trust assets remain subject to the claims of creditors and are not the property of the employees, they are accounted for as corporate assets and are included in Other Assets on the consolidated balance sheets. Total assets in the “Rabbi” Trust related to the nonqualified pension plan at December 31, 2023 and 2022 amounted to $90.3 million and $92.3 million, respectively. Contributions of $16.5 million and $20.7 million were made to the “Rabbi” Trust in 2023 and 2022, respectively.

The following tables set forth the status, amounts included in AOCI, and net periodic pension expense of the U.S. Qualified Plan, Non-U.S. Pension Plans, and U.S. Non-Qualified Plan. Prior service credits for the U.S. Qualified Plan were amortized on a straight-line basis over 11 years and were amortized in full as of December 31, 2022. Prior service

costs for the U.S. Non-Qualified Plan were amortized on a straight-line basis over 10 years and were amortized in full as of December 31, 2021.

TABLE 103: EMPLOYEE BENEFIT PLAN STATUS

	U.S. QUALIFIED PLAN						NON-U.S. PENSION PLANS						U.S. NON-QUALIFIED PLAN
($ In Millions)	2023			2022			2023			2022			2023			2022
Accumulated Benefit Obligation	$	1,015.6		$	963.3		$	143.7		$	126.2		$	94.1		$	97.4
Projected Benefit Obligation	$	1,151.7		$	1,077.7		$	148.6		$	129.0		$	109.2		$	113.6
Plan Assets at Fair Value	1,200.8			1,176.8			148.7			134.5			—			—
Funded Status at December 31	$	49.1		$	99.1		$	0.1		$	5.5		$	(109.2)		$	(113.6)
Weighted-Average Assumptions:
Discount Rates	5.03		%	5.22		%	3.12		%	3.76		%	4.95		%	5.15		%
Rate of Increase in Compensation Level	5.56			5.56			1.75			1.75			5.56			5.56
Expected Long-Term Rate of Return on Assets	7.25			7.25			3.90			3.99			N/A			N/A

TABLE 104: AMOUNTS INCLUDED IN ACCUMULATED OTHER COMPREHENSIVE INCOME

	U.S. QUALIFIED PLAN				NON-U.S. PENSION PLANS				U.S. NON-QUALIFIED PLAN
(In Millions)	2023		2022		2023		2022		2023		2022
Net Actuarial Loss	$	467.7	$	418.3	$	34.4	$	24.3	$	62.3	$	59.2
Prior Service (Credit) Cost	—		—		—		0.2		—		—
Gross Amount in Accumulated Other Comprehensive Income	467.7		418.3		34.4		24.5		62.3		59.2
Income Tax Effect	117.7		105.1		5.1		4.9		15.6		14.8
Net Amount in Accumulated Other Comprehensive Income	$	350.0	$	313.2	$	29.3	$	19.6	$	46.7	$	44.4

TABLE 105: NET PERIODIC PENSION EXPENSE

	U.S. QUALIFIED PLAN(1)													NON-U.S. PENSION PLANS									U.S. NON-QUALIFIED PLAN
($ In Millions)	2023			2022					2021					2023			2022			2021			2023			2022			2021
Service Cost	$	46.0		$	48.0				$	52.3				$	1.6		$	1.7		$	2.2		$	4.8		$	5.6		$	5.3
Interest Cost	53.9			46.3					40.4					4.8			2.5			2.2			5.3			3.9			3.7
Expected Return on Plan Assets	(100.9)			(85.7)					(79.0)					(6.7)			(3.2)			(3.2)			—			—			—
Amortization:
Net Actuarial Loss	1.5			11.4					32.4					(0.4)			0.6			1.0			5.3			7.4			8.2
Prior Service (Credit) Cost	—			(0.1)					(0.4)					—			—			0.2			—			—			0.1
Net Periodic Pension Expense	$	0.5		$	19.9				$	45.7				$	(0.7)		$	1.6		$	2.4		$	15.4		$	16.9		$	17.3
Settlement Expense	—			44.1					27.9					—			0.8			0.4			—			—			—
Total Pension Expense	$	0.5		$	64.0				$	73.6				$	(0.7)		$	2.4		$	2.8		$	15.4		$	16.9		$	17.3
Weighted-Average Assumptions:
Discount Rates	5.22		%	3.03		%	4.81	%	2.75		%	3.05	%	3.76		%	1.34		%	0.93		%	5.15		%	2.80		%	2.45		%
				5.49		%	5.22	%	3.06		%	3.03	%
Rate of Increase in Compensation Level	5.56			4.97								4.97		1.75			1.50			1.50			5.56			4.97			4.97
Expected Long-Term Rate of Return on Assets	7.25			5.25			6.00		5.25			5.00		3.99			1.79			1.28			N/A			N/A			N/A
							6.50

(1) In determining the pension expense for the U.S. Qualified Plan for 2022, Northern Trust utilized a discount rate of 3.03% as of December 31, 2021, 4.81% as of June 30, 2022, 5.49% as of September 30, 2022, and 5.22% as of December 31, 2022 and the expected long-term rate of return was 5.25% as of December 31, 2021, 6.00% as of June 30, 2022, and 6.50% as of September 30, 2022.

In determining the pension expense for the U.S. Qualified Plan for 2021, Northern Trust utilized a discount rate of 2.75% as of December 31, 2020, 3.05% as of June 30, 2021, 3.06% as of September 30, 2021, and 3.03% as of December 31, 2021 and the expected long-term rate of return was 5.25% as of both December 31, 2020 and June 30, 2021, and 5.00% as of September 31, 2021.

Northern Trust’s U.S. Qualified Plan provides participants the option to select lump-sum benefit payments upon retirement and termination of service. In the second quarter of both 2022 and 2021, it became probable that total lump-sum payments

during each year would exceed the settlement threshold of the sum of annual service and interest cost. Therefore, Northern Trust recognized settlement charges related to its U.S. Qualified Plan in the second, third, and fourth quarter of both 2022 and 2021, which required interim remeasurements of the U.S. Qualified Plan as of each respective quarter-end. The settlement charge represents the pro rata amount of the net loss in AOCI that is charged to income based on the proportion of the Projected Benefit Obligation settled to the total Projected Benefit Obligation and amounted to a total of $44.1 million and $27.9 million in 2022 and 2021, respectively.

The components of net periodic pension expense are included in Employee Benefits expense on the consolidated statements of income.

TABLE 106: CHANGE IN PROJECTED BENEFIT OBLIGATION

	U.S. QUALIFIED PLAN				NON-U.S. PENSION PLANS				U.S. NON-QUALIFIED PLAN
(In Millions)	2023		2022		2023		2022		2023		2022
Beginning Balance	$	1,077.7	$	1,401.3	$	129.0	$	210.1	$	113.6	$	147.7
Service Cost	46.0		48.0		1.6		1.7		4.8		5.6
Interest Cost	53.9		46.3		4.8		2.5		5.3		3.9
Employee Contributions	—		—		0.8		0.7		—		—
Plan Amendment	—		—		(0.2)		(0.3)		—		—
Actuarial Loss (Gain)	36.8		(281.2)		8.1		(64.3)		8.4		(20.0)
Settlements	—		(125.0)		—		(0.9)		—		—
Benefits Paid	(62.7)		(11.7)		(4.1)		(4.6)		(22.9)		(23.6)
Foreign Exchange Rate Changes	—		—		8.6		(15.9)		—		—
Ending Balance	$	1,151.7	$	1,077.7	$	148.6	$	129.0	$	109.2	$	113.6

Actuarial losses of $53.3 million in 2023 were primarily caused by decreases in discount rates, while actuarial gains of $365.5 million in 2022 were primarily caused by substantial increases in discount rates.

TABLE 107: ESTIMATED FUTURE BENEFIT PAYMENTS

(In Millions)	U.S. QUALIFIED PLAN		NON-U.S.PENSION PLANS		U.S. NON-QUALIFIED PLAN
2024	$	95.7	$	6.2	$	15.8
2025	99.6		4.7		16.1
2026	98.9		5.5		13.4
2027	101.2		6.5		11.2
2028	98.6		6.8		11.2
2029-2033	487.6		35.3		49.8

TABLE 108: CHANGE IN PLAN ASSETS

	U.S. QUALIFIED PLAN				NON-U.S PENSION PLANS
(In Millions)	2023		2022		2023		2022
Fair Value of Assets at Beginning of Period	$	1,176.8	$	1,708.9	$	134.5	$	198.7
Actual Return on Assets	86.8		(395.4)		5.0		(46.9)
Employer Contributions	—		—		3.9		3.6
Employee Contributions	—		—		0.8		0.7
Settlements	—		(125.0)		—		(0.9)
Benefits Paid	(62.8)		(11.7)		(4.1)		(4.6)
Foreign Exchange Rate Changes	—		—		8.6		(16.1)
Fair Value of Assets at End of Period	$	1,200.8	$	1,176.8	$	148.7	$	134.5

The minimum required and maximum deductible contributions for the U.S. Qualified Plan in 2024 are estimated to be zero and $420.0 million, respectively. The remaining 2024 maximum deductible contribution, after considering a cash contribution of $200.0 million made to the U.S. Qualified Plan during January 2024, is estimated at $220.0 million.

The investment strategy employed for Northern Trust’s U.S. Qualified Plan utilizes a dynamic glide path based on a set of pre-approved asset allocations to return-seeking and liability-hedging assets that vary in accordance with the U.S. Qualified Plan’s projected benefit obligation funded ratio. In general, as the U.S. Qualified Plan’s projected benefit

obligation funded ratio increases beyond an established threshold, the U.S. Qualified Plan’s allocation to liability-hedging assets will increase while the allocation to return-seeking assets will decrease. Conversely, a decrease in the U.S. Qualified Plan’s projected benefit obligation funded ratio beyond an established threshold will generally result in a decrease in the U.S. Qualified Plan’s allocation to liability-hedging assets and increase in the allocation to return-seeking assets. Liability-hedging assets include U.S. long credit bonds, U.S. long government bonds, and a custom completion strategy used to hedge more closely the liability duration of projected plan benefits with bond duration across all durations. Return-seeking assets include: U.S. equity, international developed equity, emerging markets equity, real estate, high yield bonds, global listed infrastructure, emerging market debt, private equity and hedge funds. During 2022, the funded ratio fell below the threshold and in early 2023 the asset allocation of the U.S. Qualified Plan was adjusted to a stage of the glide path which allows for a greater component of return-seeking assets.

Northern Trust utilizes an asset/liability methodology to determine the investment policies that will best meet its short and long-term objectives. The process is performed by modeling current and alternative strategies for asset allocation, funding policy and actuarial methods and assumptions. The financial modeling uses projections of expected capital market returns and expected volatility of those returns to determine alternative asset mixes having the greatest probability of meeting the U.S. Qualified Plan’s investment objectives. Risk tolerance is established through careful consideration of the U.S. Qualified Plan liabilities, funded status, and corporate financial condition. The intent of this strategy is to protect the U.S. Qualified Plan’s funded status and generate returns, which in combination with voluntary contributions are expected to outpace the U.S. Qualified Plan’s liability growth over the long run.

As of December 31, 2023, the target allocation of the U.S. Qualified Plan assets consisted of 45% U.S. long credit bonds, 20% global equities (developed and emerging markets), 10% custom completion, 5% private equity, 5% high yield bonds, 4% emerging market debt, 4% global listed infrastructure, 4% private real estate, and 3% hedge funds.

Global equity investments include common stocks that are listed on an exchange and investments in commingled funds that invest primarily in publicly traded equities. Equity investments are diversified across country, region, investment style and market capitalization. Fixed income securities held include U.S. treasury securities, corporate bonds, and investments in commingled funds that invest in a diversified blend of longer duration fixed income securities; the custom completion strategy uses U.S. treasury securities and interest rate futures (or similar instruments) to align more closely with the target hedge ratio across maturities. Diversifying investments, including private equity, hedge funds, private real estate, emerging market debt, high yield bonds, and global listed infrastructure, are used judiciously to enhance long-term returns while improving portfolio diversification. Private equity assets consist primarily of investments in limited partnerships that invest in individual companies in the form of non-public equity or non-public debt positions. Direct or co-investment in non-public stock by the U.S. Qualified Plan is prohibited. The U.S. Qualified Plan’s private equity investments are limited to 20% of each of the total limited partnership or fund of funds and the maximum allowable loss cannot exceed the commitment amount. The U.S. Qualified Plan invests in one hedge fund of funds, which invests, either directly or indirectly, in diversified portfolios of funds or other pooled investment vehicles.

Investments in private real estate, high yield bonds, emerging market debt, and global listed infrastructure are designed to provide income and added diversification.

Derivatives may be used, depending on the nature of the asset class to which they relate, to gain market exposure in an efficient and timely manner, to hedge foreign currency exposure or interest rate risk, or to alter the duration of a portfolio. There were four derivatives held by the U.S. Qualified Plan at both December 31, 2023 and 2022.

Investment risk is measured and monitored on an ongoing basis through monthly liability measurements, periodic asset/liability studies, and quarterly investment portfolio reviews. Standards used to evaluate the U.S. Qualified Plan’s investment manager performance include, but are not limited to, the achievement of objectives, operation within guidelines and policy, and comparison against a benchmark. In addition, each manager of the investment funds held by the U.S. Qualified Plan is ranked against a universe of peers and compared to a benchmark. Total U.S. Qualified Plan performance analysis includes an analysis of the market environment, asset allocation impact on performance, risk and return relative to other ERISA plans, and manager impacts upon U.S. Qualified Plan performance.

The following describes the hierarchy of inputs used to measure fair value and the primary valuation methodologies used by Northern Trust for the U.S. Qualified Plan assets measured at fair value.

Level 1 – Quoted, active market prices for identical assets or liabilities. The U.S. Qualified Plan’s Level 1 assets are comprised primarily of mutual funds and domestic common stocks. The U.S. Qualified Plan’s Level 1 investments that are exchange traded are valued at the closing price reported by the respective exchanges on the day of valuation.

Level 2 – Observable inputs other than Level 1 prices, such as quoted active market prices for similar assets or liabilities, quoted prices for identical or similar assets in inactive markets, and model-derived valuations in which all significant inputs are observable in active markets. The U.S. Qualified Plan’s Level 2 assets are comprised of collective trust funds, corporate bonds, government obligations, and municipal and provincial bonds. The investments in collective trust funds fair values are calculated on a scheduled basis using the closing market prices and accruals of securities in the

funds (total value of the funds) divided by the number of fund shares currently issued and outstanding. Redemptions of the collective trust funds occur by contract at the respective fund’s redemption date net asset value (NAV).

Level 3 – Valuation techniques in which one or more significant inputs are unobservable in the marketplace. The U.S. Qualified Plan did not hold Level 3 assets as of December 31, 2023 and 2022.

Assets valued at fair value using NAV per share - The U.S. Qualified Plan’s assets valued at fair value using NAV per share include investments in private equity funds and a hedge fund, which invest in underlying groups of investment funds or other pooled investment vehicles that are selected by the respective funds’ investment managers. The investment funds and the underlying investments held by these investment funds are valued at fair value. In determining the fair value of the underlying investments of each fund, the fund’s investment manager or general partner takes into account the estimated value reported by the underlying funds as well as any other considerations that may, in their judgment, increase or decrease such estimated value. The investments in the private equity funds and a hedge fund are considered to be long-term investments. There are no capital withdrawal options related to the investments in the private equity funds. However, capital is periodically distributed as underlying investments are sold. It is estimated that the current private equity investments would be liquidated over 1 to 15 years, depending on the vintage year of a particular fund. With sixty days advance notice, the Plan’s investment in the hedge fund can be withdrawn at the next calendar quarter end.

The U.S. Qualified Plan’s assets valued at fair value using NAV per share also include investments in real estate funds, which invest in real estate assets. The investment in properties by the real estate funds are carried at fair value, which is estimated based on the price that would be received to sell an asset in an orderly transaction between marketplace participants at the measurement date. The valuation plan for each real estate investment is subject to review on an annual basis which is based on either an external appraisal from appraisal firms or internal valuations prepared by the real estate fund’s investment advisor. The Plan’s investment in real estate funds are considered to be long-term investments and, with forty-five days advance notice, can be withdrawn at the next calendar quarter end to the extent the real estate funds have liquid assets.

As investments in the private equity funds, hedge fund, and real estate fund are valued at fair value using NAV per share, they are not required to be categorized within the fair value hierarchy.

While Northern Trust believes its valuation methods for U.S. Qualified Plan assets are appropriate and consistent with other market participants, the use of different methodologies or assumptions could have a material effect on the computation of the estimated fair values.

The following table presents the fair values of Northern Trust’s U.S. Qualified Plan assets, by major asset category, and their level within the fair value hierarchy defined by GAAP as of December 31, 2023 and 2022.

TABLE 109: FAIR VALUE OF U.S. QUALIFIED PLAN ASSETS

	DECEMBER 31, 2023
(In Millions)	LEVEL 1		LEVEL 2		LEVEL 3		TOTAL
Domestic Common Stock	$	16.6	$	—	$	—	$	16.6
Foreign Common Stock	0.3		—		—		0.3
Domestic Corporate Bonds	—		218.2		—		218.2
Foreign Corporate Bonds	—		33.6		—		33.6
U.S. Government Obligations	—		87.5		—		87.5
Non-U.S. Government Obligations	—		14.0		—		14.0
Domestic Municipal and Provincial Bonds	—		17.2		—		17.2
Foreign Municipal and Provincial Bonds	—		0.3		—		0.3
Collective Trust Funds	—		571.5		—		571.5
Mutual Funds	80.3		—		—		80.3
Cash and Other(1)	(3.4)		—		—		(3.4)
Total Assets at Fair Value in the Fair Value Hierarchy	$	93.8	$	942.3	$	—	$	1,036.1
Assets Valued at NAV per share
Northern Trust Private Equity Funds							45.6
Northern Trust Hedge Fund							36.2
Real Estate Funds							82.9
Total Assets at Fair Value							$	1,200.8

(1) Negative balance in Cash and Other as of December 31, 2023 primarily relates to the timing of transfers between cash accounts and short-term investment funds presented in Collective Trust Funds.

	DECEMBER 31, 2022
(In Millions)	LEVEL 1		LEVEL 2		LEVEL 3		TOTAL
Domestic Common Stock	$	14.7	$	—	$	—	$	14.7
Foreign Common Stock	0.5		—		—		0.5
Domestic Corporate Bonds	—		263.6		—		263.6
Foreign Corporate Bonds	—		39.6		—		39.6
U.S. Government Obligations	—		77.5		—		77.5
Non-U.S. Government Obligations	—		13.8		—		13.8
Domestic Municipal and Provincial Bonds	—		16.8		—		16.8
Foreign Municipal and Provincial Bonds	—		0.2		—		0.2
Collective Trust Funds	—		522.3		—		522.3
Mutual Funds	61.4		—		—		61.4
Cash and Other(1)	(1.1)		—		—		(1.1)
Total Assets at Fair Value in the Fair Value Hierarchy	$	75.5	$	933.8	$	—	$	1,009.3
Assets Valued at NAV per share
Northern Trust Private Equity Funds							33.2
Northern Trust Hedge Fund							35.2
Real Estate Funds							99.1
Total Assets at Fair Value							$	1,176.8

(1) Negative balance in Cash and Other as of December 31, 2022 primarily relates to due to broker for securities purchased.

A building block approach is employed for Northern Trust’s U.S. Qualified Plan in determining the long-term rate of return for plan assets. Historical markets and long-term historical relationships between equities, fixed income and other asset classes are studied using the widely accepted capital market principle that assets with higher volatility generate a greater return over the long-run. Current market factors such as inflation expectations and interest rates are evaluated before long-term capital market assumptions are determined. The long-term portfolio rate of return is established with consideration given to diversification and rebalancing. The rate is reviewed against peer data and historical returns to verify the return is reasonable and appropriate. Based on this approach and the U.S. Qualified Plan’s target asset allocation, the expected long-term rate of return on assets as of the U.S. Qualified Plan’s December 31, 2023 measurement date was set at 7.25%.

Defined Contribution Plans. The Corporation and its subsidiaries maintain various defined contribution plans covering substantially all employees. The Corporation’s contribution to the U.S. plan and to certain European-based plans includes a matching component. The expense associated with defined contribution plans is charged to Employee Benefits expense on the consolidated statements of income and totaled $72.4 million in 2023, $67.2 million in 2022, and $65.3 million in 2021.

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Share-Based Compensation Plans

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

Share-Based Compensation Plans

Share-Based Compensation Plans

Northern Trust recognizes expense for the grant-date fair value of share-based compensation granted to employees and non-employee directors.

Total compensation expense for share-based payment arrangements to employees and the associated tax impacts were as follows for the periods presented.

TABLE 110: TOTAL COMPENSATION EXPENSE FOR SHARE-BASED PAYMENT ARRANGEMENTS TO EMPLOYEES

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Restricted Stock Unit Awards	$	95.7	$	96.4	$	78.2
Performance Stock Units	22.5		28.8		17.3
Total Share-Based Compensation Expense	$	118.2	$	125.2	$	95.5
Tax Benefits Recognized	$	29.9	$	31.4	$	24.0

As of December 31, 2023, there was $96.0 million of unrecognized compensation cost related to unvested share-based compensation arrangements granted under the Corporation’s share-based compensation plans. That cost is expected to be recognized as expense over a weighted-average period of approximately 3 years.

The Northern Trust Corporation 2017 Long-Term Incentive Plan (2017 Plan) is administered by the Human Capital and Compensation Committee (Committee) of the Board of Directors. All employees of the Corporation and its subsidiaries and all directors of the Corporation are eligible to receive awards under the 2017 Plan. The 2017 Plan provides for the grant of non-qualified and incentive stock options; tandem and free-standing stock appreciation rights; stock awards in the form of restricted stock, restricted stock units and other stock awards; and performance awards.

Restricted stock unit and performance stock unit grants continue to vest in accordance with the original terms of the award if the applicable employee retires after satisfying applicable age and service requirements.

Grants are outstanding under the 2017 Plan, the Northern Trust Corporation 2012 Stock Plan (2012 Plan), and the Amended and Restated Northern Trust Corporation 2002 Stock Plan (2002 Plan). The 2017 Plan was approved by stockholders in April 2017. Upon approval of the 2017 Plan, no additional shares have been or will be granted under the 2012 Plan or 2002 Plan. The total number of shares of the Corporation’s common stock authorized for issuance under the 2017 Plan is 20,000,000 plus shares forfeited under the 2012 Plan and 2002 Plan. As of December 31, 2023, shares available for future grant under the 2017 Plan, including shares forfeited under the 2012 Plan and 2002 Plan, totaled 13,718,608.

The following describes Northern Trust’s share-based payment arrangements and applies to awards under the 2017 Plan, 2012 Plan and the 2002 Plan, as applicable.

Stock Options. Stock options consist of options to purchase common stock at prices not less than 100% of the fair value thereof on the date the options are granted. Options have a maximum 10 years life and generally vest and become exercisable in 1 year to 4 years after the date of grant. All options terminate at such time as determined by the Committee and as provided in the terms and conditions of the respective option grants. There were no options granted during the years ended December 31, 2023, 2022, and 2021.

The following table provides information about stock options granted, vested, and exercised in the years ended December 31, 2023, 2022, and 2021.

TABLE 111: STOCK OPTIONS GRANTED, VESTED, AND EXERCISED

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Grant-Date Fair Value of Stock Options Vested	$	—	$	—	$	2.2
Stock Options Exercised
Intrinsic Value as of Exercise Date	1.6		3.6		41.3
Cash Received	2.3		3.9		53.8
Tax Deduction Benefits Realized	1.6		3.5		41.3

A summary of the status of stock options at December 31, 2023, and changes during the year then ended, are presented in the following table.

TABLE 112: STATUS OF STOCK OPTIONS AND CHANGES

($ In Millions Except Per Share Information)	SHARES	WEIGHTED AVERAGE EXERCISE PRICE PER SHARE		WEIGHTED AVERAGE REMAINING CONTRACTUAL TERM (YEARS)	AGGREGATE INTRINSIC VALUE
Options Outstanding, December 31, 2022	441,547	$	72.58
Granted	—	—
Exercised	(42,143)	54.87
Forfeited, Expired or Cancelled	—	—
Options Outstanding, December 31, 2023	399,404	$	74.45	1.9	$	4.7
Options Exercisable, December 31, 2023	399,404	$	74.45	1.9	$	4.7

Restricted Stock Unit Awards. Restricted stock units may be granted to participants and entitles them to receive a payment in the Corporation’s common stock or cash and such other terms and conditions as the Committee deems appropriate. Each restricted stock unit provides the recipient the opportunity to receive one share of stock for each stock unit that vests. The restricted stock units granted in 2023 predominately vest at a rate equal to 25% per year for four years on the first day of the month following the month in which the grant date falls. Restricted stock unit grants totaled 1,166,376, 1,061,573, and 846,433, with weighted average grant-date fair values of $91.56, $110.99, and $99.31 per share, for the years ended December 31, 2023, 2022, and 2021, respectively. The total fair value of restricted stock units vested during the years ended December 31, 2023, 2022, and 2021, was $85.9 million, $75.6 million, and $89.4 million, respectively.

A summary of the status of outstanding restricted stock unit awards at December 31, 2023, and changes during the year then ended, is presented in the following table.

TABLE 113: OUTSTANDING RESTRICTED STOCK UNIT AWARDS

($ In Millions)	NUMBER	AGGREGATE INTRINSIC VALUE
Restricted Stock Unit Awards Outstanding, December 31, 2022	2,243,183	$	198.5
Granted	1,166,376
Distributed	(847,281)
Forfeited or Cancelled	(62,220)
Restricted Stock Unit Awards Outstanding, December 31, 2023	2,500,058	$	211.0
Units Convertible, December 31, 2023	18,887	$	1.6

The following is a summary of nonvested restricted stock unit awards at December 31, 2023, and changes during the year then ended.

TABLE 114: NONVESTED RESTRICTED STOCK UNIT AWARDS

NONVESTED RESTRICTED STOCK UNITS	NUMBER	WEIGHTED AVERAGE GRANT- DATE FAIR VALUE PER UNIT		WEIGHTED AVERAGE REMAINING VESTING TERM (YEARS)
Nonvested at December 31, 2022	2,223,657	$	103.41	2.4
Granted	1,166,376	91.56
Vested	(846,642)	101.38
Forfeited or Cancelled	(62,220)	99.66
Nonvested at December 31, 2023	2,481,171	$	98.62	2.4

Performance Stock Units. Each performance stock unit provides the recipient the opportunity to receive one share of the Corporation’s common stock for each stock unit based on the attainment of certain performance criteria over a three-year period. For performance stock unit awards granted in 2021, 2022 and 2023, the number of units that will vest are subject to the attainment of specified performance targets that are a function of average return on equity goals and average return on equity performance relative to that of a performance peer group, each measured over a three-year period. For performance stock units outstanding as of December 31, 2023, the number of performance stock units that will vest ranges from 0% to 150% of the original award granted based on the achievement of both absolute and relative return on equity goals over a three-year period compared to performance targets. Distribution of the shares is then made after vesting.

Performance stock unit grants totaled 219,314, 211,906, and 204,539 for the years ended December 31, 2023, 2022, and 2021, respectively, with weighted average grant-date fair values of $93.97, $113.64, and $97.77. Performance stock units outstanding at target level performance totaled 613,450, 607,892, and 622,817 at December 31, 2023, 2022, and 2021, respectively. Performance stock units had aggregate intrinsic values of $51.8 million, $53.8 million, and $74.5 million, and weighted average remaining vesting terms of 1.0 year each at December 31, 2023, 2022, and 2021, respectively.

Non-employee Director Stock Awards. Stock units with total values of $1.6 million (20,405 units), $1.6 million (14,773 units), and $1.5 million (13,968 units) were granted to non-employee directors in 2023, 2022, and 2021, respectively, which vest or vested on the date of the annual meeting of the Corporation’s stockholders in the following years. Total expense recognized on these grants was $1.7 million, $1.7 million, and $1.6 million in 2023, 2022, and 2021, respectively. Stock units granted to non-employee directors do not have voting rights. Each stock unit entitles a director to one share of common stock at vesting, unless a director elects to defer receipt of the shares. Directors may elect to defer the payment of their annual stock unit grant and cash-based compensation until termination of services as director. Deferred cash compensation is converted into stock units representing shares of common stock of the Corporation. Distributions of deferred stock units are made in stock. For compensation deferred prior to January 1, 2018, distributions of the stock unit accounts that relate to cash-based compensation are made in cash based on the fair value of the stock units at the time of distribution. For compensation deferred on or after January 1, 2018, distributions of the stock unit accounts that relate to cash-based compensation are made in stock.

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Cash-Based Compensation Plans

12 Months Ended

Dec. 31, 2023

Compensation Related Costs [Abstract]

Cash-Based Compensation Plans

Cash-Based Compensation Plans

Various incentive plans provide for cash incentives and bonuses to selected employees based upon accomplishment of corporate net income objectives, goals of the reporting segments and support functions, and individual performance. The provision for awards under these plans is charged to Compensation expense and totaled $358.7 million in 2023, $392.7 million in 2022, and $377.1 million in 2021.

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Commitments and Contingent Liabilities

12 Months Ended

Dec. 31, 2023

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingent Liabilities

Commitments and Contingent Liabilities

Off-Balance Sheet Financial Instruments, Guarantees and Other Commitments. Northern Trust, in the normal course of business, enters into various types of commitments and issues letters of credit to meet the liquidity and credit enhancement needs of its clients. The contractual amounts of these instruments represent the maximum potential credit exposure should the instrument be fully drawn upon and the client default. To control the credit risk associated with entering into commitments and issuing letters of credit, Northern Trust subjects such activities to the same credit quality and monitoring controls as its lending activities. Northern Trust does not believe the total contractual amount of these instruments to be representative of its future credit exposure or funding requirements.

The following table provides details of Northern Trust's off-balance sheet financial instruments as of December 31, 2023 and 2022.

TABLE 115: SUMMARY OF OFF-BALANCE SHEET FINANCIAL INSTRUMENTS

	DECEMBER 31,
	2023						2022
(In Millions)	ONE YEAR AND LESS		OVER ONE YEAR		TOTAL		ONE YEAR AND LESS		OVER ONE YEAR		TOTAL
Undrawn Commitments(1)	$	11,849.5	$	18,909.6	$	30,759.1	$	13,639.2	$	17,321.4	$	30,960.6
Standby Letters of Credit and Financial Guarantees(2)(3)	85,752.0		639.0		86,391.0		17,553.0		409.9		17,962.9
Commercial Letters of Credit	29.2		1.3		30.5		25.4		1.3		26.7
Securities Lent with Indemnification	140,539.1		—		140,539.1		130,311.0		—		130,311.0
Unsettled Reverse Repurchase Agreements	27,667.7		—		27,667.7		496.8		—		496.8
Total Off-Balance Sheet Financial Instruments	$	265,837.5	$	19,549.9	$	285,387.4	$	162,025.4	$	17,732.6	$	179,758.0

(1) These amounts exclude $222.2 million and $266.6 million of commitments participated to others at December 31, 2023 and 2022, respectively.

(2) These amounts include $39.1 million and $35.1 million of standby letters of credit secured by cash deposits or participated to others as of December 31, 2023 and 2022, respectively.

(3) This amount includes a $84.6 billion guarantee to the Fixed Income Clearing Corporation (FICC) under the sponsored member program, without taking into consideration the related collateral, as of December 31, 2023. As of December 31, 2022, there was a $16.3 billion guarantee to the FICC; Northern Trust became a sponsored member during the third quarter of 2021.

Undrawn Commitments generally have fixed expiration dates or other termination clauses. Since a significant portion of the commitments are expected to expire without being drawn upon, the total commitment amount does not necessarily represent future loans or liquidity requirements.

Standby Letters of Credit obligate Northern Trust to meet certain financial obligations of its clients, if, under the contractual terms of the agreement, the clients are unable to do so. These instruments are primarily issued to support public and private financial commitments, including commercial paper, bond financing, initial margin requirements on futures exchanges, and similar transactions. Northern Trust is obligated to meet the entire financial obligation of these agreements and in certain cases is able to recover the amounts paid through recourse against collateral received or other participants. Since the vast majority of the standby letters of credit are never drawn, the total standby letters of credit amount does not necessarily represent future loans or liquidity requirements.

Financial Guarantees are issued by Northern Trust to guarantee the performance of a client to a third party under certain arrangements.

Commercial Letters of Credit are instruments issued by Northern Trust on behalf of its clients that authorize a third party (the beneficiary) to draw drafts up to a stipulated amount under the specified terms and conditions of the agreement and other similar instruments. Commercial letters of credit are issued primarily to facilitate international trade.

Securities Lent with Indemnification involves Northern Trust lending securities owned by clients to borrowers who are reviewed and approved by the Northern Trust Capital Markets Credit Committee, as part of its securities custody activities and at the direction of its clients. In connection with these activities, Northern Trust has issued indemnifications to certain clients against certain losses that are a direct result of a borrower’s failure to return securities when due, should the value of such securities exceed the value of the collateral required to be posted. Borrowers are required to fully collateralize securities received with cash or marketable securities. As securities are loaned, collateral is maintained at a minimum of 100% of the fair value of the securities plus accrued interest. The collateral is revalued on a daily basis. The amount of securities loaned subject to indemnification as of December 31, 2023 and December 31, 2022, was $140.5 billion and $130.3 billion, respectively. Because of the credit quality of the borrowers and the requirement to fully collateralize securities borrowed, management believes that the exposure to credit loss from this activity is not significant and no liability was recorded at December 31, 2023, or 2022 related to these indemnifications.

Unsettled Repurchase and Reverse Repurchase Agreements. Northern Trust enters into repurchase agreements and reverse repurchase agreements which may settle at a future date. In repurchase agreements, Northern Trust receives cash from and provides securities as collateral to a counterparty. In reverse repurchase agreements, Northern Trust advances cash to and receives securities as collateral from a counterparty. These transactions are recorded on the consolidated balance sheets on the settlement date. As of December 31, 2023, and 2022, there were $27.7 billion and $496.8 million of unsettled reverse repurchase agreements, and no unsettled repurchase agreements, respectively.

Sponsored Member Program. Northern Trust is an approved Government Securities Division (GSD) netting and sponsoring member in the Fixed Income Clearing Corporation (FICC) sponsored member program, through which Northern Trust submits eligible repurchase and reverse repurchase transactions in U.S. government securities between Northern Trust and its sponsored member clients for novation and clearing. Northern Trust may sponsor clients to clear

their eligible repurchase transactions with the FICC. As a sponsoring member, Northern Trust guarantees to the FICC the prompt and full payment and performance of its sponsored member clients’ respective obligations under the FICC GSD’s rules. To mitigate Northern Trust’s credit exposure under this guarantee, Northern Trust obtains a security interest in its sponsored member clients’ collateral. Please refer to Note 27, “Offsetting of Assets and Liabilities” for additional information on Northern Trust’s repurchase and reverse repurchase agreements.

Clearing and Settlement Organizations. The Bank is a participating member of various cash, securities and foreign exchange clearing and settlement organizations. It participates in these organizations on behalf of its clients and on its own behalf as a result of its own activities. A wide variety of cash and securities transactions are settled through these organizations, including those involving U.S. Treasuries, obligations of states and political subdivisions, asset-backed securities, commercial paper, dollar placements, and securities issued by the Government National Mortgage Association.

Certain of these industry clearing and settlement exchanges require their members to guarantee their obligations and liabilities and/or to provide liquidity support in the event other members do not honor their obligations as stipulated in each clearing organization’s membership agreement. Exposure related to these agreements varies, primarily as a result of fluctuations in the volume of transactions cleared through the organizations. At December 31, 2023 and 2022, Northern Trust has not recorded any material liabilities under these arrangements as Northern Trust believes the likelihood that a clearing or settlement exchange (of which Northern Trust is a member) would become insolvent is remote. Controls related to these clearing transactions are closely monitored by management to protect the assets of Northern Trust and its clients.

Legal Proceedings. In the normal course of business, the Corporation and its subsidiaries are routinely defendants in or parties to pending and threatened legal actions, and are subject to regulatory examinations, information-gathering requests, investigations, and proceedings, both formal and informal. In certain legal actions, claims for substantial monetary damages are asserted. In regulatory matters, claims for disgorgement, restitution, penalties and/or other remedial actions or sanctions may be sought.

Based on current knowledge, after consultation with legal counsel and after taking into account current accruals, management does not believe that losses, fines or penalties, if any, arising from pending litigation or threatened legal actions or regulatory matters either individually or in the aggregate, after giving effect to applicable reserves and insurance coverage will have a material adverse effect on the consolidated financial position or liquidity of the Corporation, although such matters could have a material adverse effect on the Corporation’s operating results for a particular period.

Under GAAP, (i) an event is “probable” if the “future event or events are likely to occur”; (ii) an event is “reasonably possible” if “the chance of the future event or events occurring is more than remote but less than likely”; and (iii) an event is “remote” if “the chance of the future event or events occurring is slight.”

The outcome of litigation and regulatory matters is inherently difficult to predict and/or the range of loss often cannot be reasonably estimated, particularly for matters that (i) will be decided by a jury, (ii) are in early stages, (iii) involve uncertainty as to the likelihood of a class being certified or the ultimate size of the class, (iv) are subject to appeals or motions, (v) involve significant factual issues to be resolved, including with respect to the amount of damages, (vi) do not specify the amount of damages sought or (vii) seek very large damages based on novel and complex damage and liability legal theories. Accordingly, the Corporation cannot reasonably estimate the eventual outcome of these pending matters, the timing of their ultimate resolution or what the eventual loss, fines or penalties, if any, related to each pending matter will be.

In accordance with applicable accounting guidance, the Corporation records accruals for litigation and regulatory matters when those matters present loss contingencies that are both probable and reasonably estimable. When loss contingencies are not both probable and reasonably estimable, the Corporation does not record accruals. No material accruals have been recorded for pending litigation or threatened legal actions or regulatory matters.

For a limited number of matters for which a loss is reasonably possible in future periods, whether in excess of an accrued liability or where there is no accrued liability, the Corporation is able to estimate a range of possible loss. As of December 31, 2023, the Corporation has estimated the range of reasonably possible loss for these matters to be from zero to approximately $25 million in the aggregate. The Corporation’s estimate with respect to the aggregate range of reasonably possible loss is based upon currently available information and is subject to significant judgment and a variety of assumptions and known and unknown uncertainties. The matters underlying the estimated range will change from time to time, and actual results may vary significantly from the current estimate.

In certain other pending matters, there may be a range of reasonably possible loss (including reasonably possible loss in excess of amounts accrued) that cannot be reasonably estimated for the reasons described above. Such matters are not included in the estimated range of reasonably possible loss discussed above.

In 2015, Northern Trust Fiduciary Services (Guernsey) Limited (NTFS), an indirect subsidiary of the Corporation, was charged by a French investigating magistrate judge with complicity in estate tax fraud in connection with the administration of two trusts for which it serves as trustee. Charges also were brought against a number of other persons and

entities related to this matter. In 2017, a French court found no estate tax fraud had occurred and NTFS and all other persons and entities charged were acquitted. The Public Prosecutor’s Office of France appealed the court decision and in June 2018 a French appellate court issued its opinion on the matter, acquitting all persons and entities charged, including NTFS. In January 2021, the Cour de Cassation, the highest court in France, reversed the June 2018 appellate court ruling, requiring a re-trial at the appellate court level. This re-trial concluded in October 2023 and the appellate court is expected to render its verdict in March 2024. As trustee, NTFS provided no tax advice and had no involvement in the preparation or filing of the challenged estate tax filings.

Visa Class B Common Shares. Northern Trust, as a member of Visa U.S.A. Inc. (Visa U.S.A.) and in connection with the 2007 restructuring of Visa U.S.A. and its affiliates and the 2008 initial public offering of Visa Inc. (Visa), received certain Visa Class B common shares. The Visa Class B common shares are subject to certain transfer restrictions until the final resolution of certain litigation related to interchange fees involving Visa (the covered litigation), at which time the shares are convertible into Visa Class A common shares based on a conversion rate dependent upon the ultimate cost of resolving the covered litigation. Since 2018, Visa has deposited an additional $2.8 billion into an escrow account previously established with respect to the covered litigation. As a result of the additional contributions to the escrow account, the rate at which Visa Class B common shares will convert into Visa Class A common shares was reduced to 1.5875 as of December 31, 2023.

In September 2018, Visa reached a proposed class settlement agreement covering damage claims but not injunctive relief claims regarding the covered litigation. In December 2019, the district court granted final approval for the proposed class settlement agreement. In March 2023, the Second Circuit Court of Appeals affirmed the district court’s approval of the class settlement agreement. Certain merchants have opted out of the class settlement and are pursuing claims separately. The ultimate resolution of the covered litigation, the timing for removal of the selling restrictions on the Visa Class B common shares and the rate at which such shares will ultimately convert into Visa Class A common shares are uncertain.

On January 29, 2024, Visa filed a registration statement under the Securities Act of 1933 with the SEC. This registration statement has not yet become effective. If Visa commences the exchange offer contemplated by the registration statement, Visa Class B shareholders would have the option to tender some or all of their Class B shares and in return receive shares of a newly issued series of Visa Class B common shares with a value equal to half the value of the tendered shares and Visa Class C common shares with value equal to the other half of the tendered shares. The newly issued series of Visa Class B common shares would be subject to the same transfer and convertibility restrictions as the currently outstanding Visa Class B common shares. One third of the Visa Class C common shares received would be transferable within the first 45 days following the potential exchange, up to two-thirds would be transferable within the first 90 days, and all such shares would be transferable after 90 days. The Visa Class C common shares will automatically be converted at the then applicable conversion rate into shares of Visa Class A common stock if transferred to a person other than a Visa member or an affiliate of a Visa member. After the initial exchange offer, Visa could, at its discretion, conduct up to three successive potential exchange offers, in each case, if more than 12 months have passed since the previous exchange offer and after a further 50% reduction of interchange fees at issue in the unresolved claims for damages in the covered litigation.

In June 2016 and 2015, Northern Trust recorded a $123.1 million and $99.9 million net gain on the sale of 1.1 million and 1.0 million of its Visa Class B common shares, respectively. These sales do not affect Northern Trust’s risk related to the impact of the covered litigation on the rate at which such shares will ultimately convert into Visa Class A common shares. Northern Trust continued to hold approximately 4.1 million Visa Class B common shares, which are recorded at their original cost basis of zero, as of both December 31, 2023 and 2022.

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Derivative Financial Instruments

12 Months Ended

Dec. 31, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

Derivative Financial Instruments

Northern Trust is a party to various derivative financial instruments that are used in the normal course of business to meet the needs of its clients, as part of its trading activity for its own account; and as part of its risk management activities. These instruments may include foreign exchange contracts, interest rate contracts, total return swap contracts, and swaps related to the sale of certain Visa Class B common shares. Please refer to Note 1, “Summary of Significant Accounting Policies” for the significant accounting policies for derivative financial instruments.

Foreign exchange contracts are agreements to exchange specific amounts of currencies at a future date, at a specified rate of exchange. Foreign exchange contracts are entered into primarily to meet the foreign exchange needs of clients. Foreign exchange contracts are also used for trading and risk management purposes. For risk management purposes, Northern Trust uses foreign exchange contracts to reduce its exposure to changes in foreign exchange rates relating to certain forecasted non-functional-currency-denominated revenue and expenditure transactions, foreign-currency- denominated assets and liabilities, including debt securities and net investments in non-U.S. affiliates.

Interest rate contracts include swap and option contracts. Interest rate swap contracts involve the exchange of fixed and floating rate interest payment obligations without the exchange of the underlying principal amounts. Northern Trust enters into interest rate swap contracts with its clients and also may utilize such contracts to reduce or eliminate the exposure to changes in the cash flows or fair value of hedged assets or liabilities due to changes in interest rates. Interest rate option contracts may include caps, floors, collars and swaptions, and provide for the transfer or reduction of interest rate risk, typically in exchange for a fee. Northern Trust enters into option contracts primarily as a seller of interest rate protection to clients. Northern Trust receives a fee at the outset of the agreement for the assumption of the risk of an unfavorable change in interest rates. This assumed interest rate risk is then mitigated by entering into an offsetting position with an outside counterparty. Northern Trust may also purchase or enter into option contracts for risk management purposes including to reduce the exposure to changes in the cash flows of hedged assets due to changes in interest rates.

The following table shows the notional and fair values of all derivative financial instruments as of December 31, 2023

and 2022.

TABLE 116: NOTIONAL AND FAIR VALUES OF DERIVATIVE FINANCIAL INSTRUMENTS

	DECEMBER 31, 2023						DECEMBER 31, 2022
			FAIR VALUE						FAIR VALUE
(In Millions)	NOTIONAL VALUE		ASSET(1)		LIABILITY(2)		NOTIONAL VALUE		ASSET(1)		LIABILITY(2)
Derivatives Designated as Hedging under GAAP
Interest Rate Contracts
Fair Value Hedges	$	7,042.7	$	94.7	$	71.0	$	4,622.0	$	58.5	$	32.7
Foreign Exchange Contracts
Cash Flow Hedges	1,453.6		15.0		42.2		150.9		7.4		5.7
Net Investment Hedges	4,077.4		13.3		31.9		3,765.0		283.5		12.7
Total Derivatives Designated as Hedging under GAAP	$	12,573.7	$	123.0	$	145.1	$	8,537.9	$	349.4	$	51.1
Derivatives Not Designated as Hedging under GAAP
Non-Designated Risk Management Derivatives
Foreign Exchange Contracts	$	20.7	$	—	$	0.1	$	55.9	$	0.1	$	0.1
Other Financial Derivatives(3)	867.9		—		25.4		717.7		0.3		34.8
Total Non-Designated Risk Management Derivatives	$	888.6	$	—	$	25.5	$	773.6	$	0.4	$	34.9
Client-Related and Trading Derivatives
Foreign Exchange Contracts	$	313,336.9	$	3,238.4	$	3,181.0	$	288,994.6	$	3,219.1	$	3,169.0
Interest Rate Contracts	13,584.1		206.8		298.2		12,378.2		163.5		399.1
Total Client-Related and Trading Derivatives	$	326,921.0	$	3,445.2	$	3,479.2	$	301,372.8	$	3,382.6	$	3,568.1
Total Derivatives Not Designated as Hedging under GAAP	$	327,809.6	$	3,445.2	$	3,504.7	$	302,146.4	$	3,383.0	$	3,603.0
Total Gross Derivatives	$	340,383.3	$	3,568.2	$	3,649.8	$	310,684.3	$	3,732.4	$	3,654.1
Less: Netting(4)			3,126.7		2,205.4				2,810.7		1,865.9
Total Derivative Financial Instruments			$	441.5	$	1,444.4			$	921.7	$	1,788.2

(1) Derivative assets are reported in Other Assets on the consolidated balance sheets.

(2) Derivative liabilities are reported in Other Liabilities on the consolidated balance sheets.

(3) This line includes swaps related to sales of certain Visa Class B common shares and total return swap contracts.

(4) See further detail in Note 27, "Offsetting of Assets and Liabilities."

Notional amounts of derivative financial instruments do not represent credit risk, and are not recorded on the consolidated balance sheets. They are used merely to express the volume of this activity. Northern Trust’s credit-related risk of loss is limited to the positive fair value of the derivative instrument, net of any collateral received, which is significantly less than the notional amount.

Hedging Derivative Instruments Designated under GAAP. Northern Trust uses derivative instruments to hedge its exposure to foreign currency, interest rate, and equity price. Certain hedging relationships are formally designated and qualify for hedge accounting under GAAP as fair value, cash flow or net investment hedges. Other derivatives that are entered into for risk management purposes as economic hedges are not formally designated as hedges and changes in fair value are recognized currently in Other Operating Income within the consolidated statements of income (see below section “Derivative Instruments Not Designated as Hedging under GAAP”).

Fair Value Hedges. Derivatives are designated as fair value hedges to limit Northern Trust’s exposure to changes in the fair value of assets and liabilities due to movements in interest rates.

Cash Flow Hedges. Derivatives are also designated as cash flow hedges in order to minimize the variability in cash flows of earning assets or forecasted transactions caused by movements in interest or foreign exchange rates.

There were no material gains or losses reclassified into earnings during the years ended December 31, 2023, 2022, and 2021 as a result of the discontinuance of cash flow hedges of forecasted transactions that were no longer probable of occurring. It is estimated that net losses of $27.3 million will be reclassified into Net Income within the next twelve months relating to cash flow hedges of foreign-currency-denominated debt securities. As of December 31, 2023, 4 months was the maximum length of time over which the exposure to variability in future cash flows of forecasted foreign-currency-denominated debt securities was being hedged.

The following table provides fair value and cash flow hedge derivative gains and losses recognized in income during the years ended December 31, 2023, 2022 and 2021.

TABLE 117: LOCATION AND AMOUNT OF FAIR VALUE AND CASH FLOW HEDGE DERIVATIVE GAINS AND LOSSES RECORDED IN INCOME

(In Millions)	INTEREST INCOME						INTEREST EXPENSE						OTHER OPERATING INCOME
For the Year Ended December 31,	2023		2022		2021		2023		2022		2021		2023		2022		2021
Total amounts on the consolidated statements of income	$	7,325.0	$	2,877.7	$	1,406.5	$	5,343.0	$	990.5	$	23.8	$	228.7	$	191.3	$	243.9
Gains (Losses) on fair value hedges recognized on
Interest Rate Contracts
Recognized on derivatives	(132.6)		82.8		39.1		74.9		(373.4)		(161.6)		—		—		—
Recognized on hedged items	132.6		(82.8)		(39.1)		(74.9)		373.4		161.6		—		—		—
Amounts related to interest settlements on derivatives	47.1		(4.4)		(16.2)		(86.5)		24.1		57.1		—		—		—
Total gains (losses) recognized on fair value hedges	$	47.1	$	(4.4)	$	(16.2)	$	(86.5)	$	24.1	$	57.1	$	—	$	—	$	—
Gains (Losses) on cash flow hedges recognized on
Foreign Exchange Contracts
Net gains (losses) reclassified from AOCI to net income	$	34.9	$	0.6	$	10.5	$	—	$	—	$	—	$	1.9	$	(4.3)	$	(6.0)
Total gains (losses) reclassified from AOCI to net income on cash flow hedges	$	34.9	$	0.6	$	10.5	$	—	$	—	$	—	$	1.9	$	(4.3)	$	(6.0)

The following table provides the impact of fair value hedge accounting on the carrying value of the designated hedged items, which includes hedged items no longer designated.

TABLE 118: HEDGED ITEMS IN FAIR VALUE HEDGES

	DECEMBER 31, 2023				DECEMBER 31, 2022
(In Millions)	CARRYING VALUE OF THE HEDGED ITEMS		CUMULATIVE HEDGE ACCOUNTING BASIS ADJUSTMENT(1)(3)		CARRYING VALUE OF THE HEDGED ITEMS		CUMULATIVE HEDGE ACCOUNTING BASIS ADJUSTMENT(2)(3)
Available for Sale Debt Securities(4)	$	5,048.8	$	77.5	$	1,820.8	$	(60.2)
Senior Notes and Long-Term Subordinated Debt	2,495.9		(248.7)		2,746.2		(294.0)

(1) The cumulative hedge accounting basis adjustment includes $2.2 million related to discontinued hedging relationships of AFS debt securities and $29.6 million related to discontinued hedging relationships in the cumulative hedge accounting basis adjustment of senior notes and long-term debt as of December 31, 2023.

(2) The cumulative hedge accounting basis adjustment includes $7.3 million related to discontinued hedging relationships of AFS debt securities as of December 31, 2022. There were no amounts related to discontinued hedging relationships in the cumulative hedge accounting basis adjustment of senior notes and long-term debt as of December 31, 2022.

(3) Positive (negative) amounts related to AFS securities represent cumulative fair value hedge basis adjustments that will reduce (increase) net interest income in future periods. Positive (negative) amounts related to Senior Notes and Long-Term Subordinated Debt represent cumulative fair value hedge basis adjustments that will increase (reduce) net interest income in future periods.

(4) Carrying value represents amortized cost.

Net Investment Hedges. Certain foreign exchange contracts are designated as net investment hedges to minimize Northern Trust’s exposure to variability in the foreign currency translation of net investments in non-U.S. branches and subsidiaries. Net investment hedge losses of $77.4 million and net investment hedge gains of $278.7 million were recognized in AOCI related to foreign exchange contracts for the years ended December 31, 2023 and 2022, respectively.

Derivative Instruments Not Designated as Hedging under GAAP. Northern Trust’s derivative instruments that are not designated as hedging under GAAP include derivatives for purposes of client-related and trading activities, as well as other risk management purposes. These activities consist principally of providing foreign exchange services to clients in connection with Northern Trust’s global custody business. However, in the normal course of business, Northern Trust also engages in trading of currencies for its own account.

Non-designated risk management derivatives include foreign exchange contracts entered into to manage the foreign currency risk of non-U.S.-dollar-denominated assets and liabilities, the net investment in certain non-U.S. affiliates, commercial loans, and forecasted foreign-currency-denominated transactions. Swaps related to sales of certain Visa Class B common shares were entered into pursuant to which Northern Trust retains the risks associated with the ultimate conversion of the Visa Class B common shares into Visa Class A common shares. Total return swaps are entered into to manage the equity price risk associated with certain investments.

Changes in the fair value of derivative instruments not designated as hedges under GAAP are recognized currently in income. The following table provides the location and amount of gains and losses recorded on the consolidated statements of income for the years ended December 31, 2023, 2022, and 2021 for derivative instruments not designated as hedges under GAAP.

TABLE 119: LOCATION AND AMOUNT OF GAINS AND LOSSES RECORDED IN INCOME FOR DERIVATIVES NOT DESIGNATED AS HEDGING UNDER GAAP

(In Millions)	DERIVATIVE GAINS (LOSSES) LOCATION RECOGNIZED IN INCOME	AMOUNT OF DERIVATIVE GAINS (LOSSES) RECOGNIZED IN INCOME
		2023		2022		2021
Non-designated risk management derivatives
Foreign Exchange Contracts	Other Operating Income	$	1.8	$	(3.1)	$	1.2
Other Financial Derivatives(1)	Other Operating Income	(21.2)		(22.2)		(21.3)
Gains (Losses) from non-designated risk management derivatives		$	(19.4)	$	(25.3)	$	(20.1)
Client-related and trading derivatives
Foreign Exchange Contracts	Foreign Exchange Trading Income	$	203.9	$	288.6	$	292.6
Interest Rate Contracts	Security Commissions and Trading Income	8.9		9.6		15.7
Gains (Losses) from client-related and trading derivatives		$	212.8	$	298.2	$	308.3
Total gains (losses) from derivatives not designated as hedging under GAAP		$	193.4	$	272.9	$	288.2

(1) This line includes swaps related to the sale of certain Visa Class B common shares and total return swap contracts.

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Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repurchase

12 Months Ended

Dec. 31, 2023

Investments, Debt and Equity Securities [Abstract]

Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repurchase

Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repurchase

Securities purchased under agreements to resell and securities sold under agreements to repurchase are accounted for as collateralized financings and recorded at the amounts at which the securities were acquired or sold plus accrued interest. To minimize any potential credit risk associated with these transactions, the fair value of the securities purchased or sold is monitored, limits are set on exposure with counterparties, and the financial condition of counterparties is regularly assessed. It is Northern Trust’s policy to take possession, either directly or via third-party custodians, of securities purchased under agreements to resell. Securities sold under agreements to repurchase are either directly held by, or pledged to the counterparty until the repurchase. Northern Trust nets securities sold under repurchase agreements against those purchased under resale agreements when there is a legally enforceable master netting arrangement and the other conditions to net are met.

The following tables summarize information related to Securities Purchased under Agreements to Resell and Securities Sold under Agreements to Repurchase.

TABLE 120: SECURITIES PURCHASED UNDER AGREEMENTS TO RESELL

($ In Millions)	2023			2022
Balance at December 31	$	784.7		$	1,070.3
Average Balance During the Year	950.9			1,071.2
Average Interest Rate Earned During the Year	166.71		%	9.68		%
Maximum Month-End Balance During the Year	$	1,326.2		$	1,320.8

Note: The table above includes the impact of balance sheet netting of approximately $29.1 billion and $3.6 billion in 2023 and 2022, respectively.

TABLE 121: SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE

($ In Millions)	2023			2022
Balance at December 31	$	784.7		$	567.2
Average Balance During the Year	401.5			433.6
Average Interest Rate Paid During the Year	383.84		%	20.94		%
Maximum Month-End Balance During the Year	$	988.1		$	869.0

Note: The table above includes the impact of balance sheet netting of approximately $29.1 billion and $3.6 billion in 2023 and 2022, respectively.

TABLE 122: REPURCHASE AGREEMENTS ACCOUNTED FOR AS SECURED BORROWINGS

	REMAINING CONTRACTUAL MATURITY OF THE AGREEMENTS
	OVERNIGHT AND CONTINUOUS
(In Millions)	December 31, 2023		December 31, 2022
U.S. Treasury and Agency Securities	$	784.7	$	567.2
Total Borrowings	784.7		567.2
Net Amount of Recognized Liabilities for Repurchase Agreements in Note 27	784.7		567.2

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Offsetting of Assets and Liabilities

12 Months Ended

Dec. 31, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Offsetting of Assets and Liabilities

Offsetting of Assets and Liabilities

The following table provides information regarding the offsetting of derivative assets and of securities purchased under agreements to resell within the consolidated balance sheets as of December 31, 2023 and 2022.

TABLE 123: OFFSETTING OF DERIVATIVE ASSETS AND SECURITIES PURCHASED UNDER AGREEMENTS TO RESELL

	DECEMBER 31, 2023
(In Millions)	GROSS RECOGNIZED ASSETS		GROSS AMOUNTS OFFSET IN THE BALANCE SHEET(3)		NET AMOUNTS PRESENTED IN THE BALANCE SHEET		GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET(4)		NET AMOUNT(5)
Derivative Assets(1)
Foreign Exchange Contracts Over the Counter (OTC)	$	3,006.3	$	2,937.2	$	69.1	$	12.2	$	56.9
Interest Rate Swaps OTC	301.4		189.5		111.9		—		111.9
Interest Rate Swaps Exchange Cleared	0.1		—		0.1		—		0.1
Total Derivatives Subject to a Master Netting Arrangement	3,307.8		3,126.7		181.1		12.2		168.9
Total Derivatives Not Subject to a Master Netting Arrangement	260.4		—		260.4		—		260.4
Total Derivatives	3,568.2		3,126.7		441.5		12.2		429.3
Securities Purchased under Agreements to Resell(2)	$	62,860.2	$	62,075.5	$	784.7	$	—	$	784.7

	DECEMBER 31, 2022
(In Millions)	GROSS RECOGNIZED ASSETS		GROSS AMOUNTS OFFSET IN THE BALANCE SHEET(3)		NET AMOUNTS PRESENTED IN THE BALANCE SHEET		GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET(4)		NET AMOUNT(5)
Derivative Assets(1)
Foreign Exchange Contracts OTC	$	2,928.9	$	2,666.4	$	262.5	$	5.0	$	257.5
Interest Rate Swaps OTC	217.6		144.3		73.3		—		73.3
Interest Rate Swaps Exchange Cleared	4.4		—		4.4		—		4.4
Other Financial Derivatives	0.3		—		0.3		—		0.3
Total Derivatives Subject to a Master Netting Arrangement	3,151.2		2,810.7		340.5		5.0		335.5
Total Derivatives Not Subject to a Master Netting Arrangement	581.2		—		581.2		—		581.2
Total Derivatives	3,732.4		2,810.7		921.7		5.0		916.7
Securities Purchased under Agreements to Resell(2)	$	12,494.2	$	11,423.9	$	1,070.3	$	1,070.3	$	—

(1) Derivative assets are reported in Other Assets on the consolidated balance sheets. Other Assets (excluding derivative assets) totaled $10.3 billion and $8.9 billion as of December 31, 2023 and 2022, respectively.

(2) Offsetting of Securities Purchased under Agreements to Resell primarily relates to our involvement in the FICC.

(3) Including cash collateral received from counterparties.

(4) Including financial assets accepted as collateral which are received from counterparties.

(5) Northern Trust did not possess any cash collateral that was not offset on the consolidated balance sheets that could have been used to offset the net amounts presented on the consolidated balance sheets as of December 31, 2023 and 2022.

The following table provides information regarding the offsetting of derivative liabilities and of securities sold under agreements to repurchase within the consolidated balance sheets as of December 31, 2023 and 2022.

TABLE 124: OFFSETTING OF DERIVATIVE LIABILITIES AND SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE

	DECEMBER 31, 2023
(In Millions)	GROSS RECOGNIZED LIABILITIES		GROSS AMOUNTS OFFSET IN THE BALANCE SHEET(3)		NET AMOUNTS PRESENTED IN THE BALANCE SHEET		GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET(4)		NET AMOUNT(5)
Derivative Liabilities(1)
Foreign Exchange Contracts OTC	$	2,411.7	$	2,175.7	$	236.0	$	—	$	236.0
Interest Rate Swaps OTC	368.3		6.0		362.3		—		362.3
Interest Rate Swaps Exchange Cleared	0.9		—		0.9		—		0.9
Other Financial Derivatives	25.4		23.7		1.7		—		1.7
Total Derivatives Subject to a Master Netting Arrangement	2,806.3		2,205.4		600.9		—		600.9
Total Derivatives Not Subject to a Master Netting Arrangement	843.5		—		843.5		—		843.5
Total Derivatives	3,649.8		2,205.4		1,444.4		—		1,444.4
Securities Sold under Agreements to Repurchase(2)	$	62,860.2	$	62,075.5	$	784.7	$	784.7	$	—

	DECEMBER 31, 2022
(In Millions)	GROSS RECOGNIZED LIABILITIES		GROSS AMOUNTS OFFSET IN THE BALANCE SHEET(3)		NET AMOUNTS PRESENTED IN THE BALANCE SHEET		GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET(4)		NET AMOUNT(5)
Derivative Liabilities(1)
Foreign Exchange Contracts OTC	$	2,082.3	$	1,826.7	$	255.6	$	—	$	255.6
Interest Rate Swaps OTC	426.5		5.9		420.6		—		420.6
Interest Rate Swaps Exchange Cleared	5.3		—		5.3		—		5.3
Other Financial Derivatives	34.8		33.3		1.5		—		1.5
Total Derivatives Subject to a Master Netting Arrangement	2,548.9		1,865.9		683.0		—		683.0
Total Derivatives Not Subject to a Master Netting Arrangement	1,105.2		—		1,105.2		—		1,105.2
Total Derivatives	3,654.1		1,865.9		1,788.2		—		1,788.2
Securities Sold under Agreements to Repurchase(2)	$	11,991.1	$	11,423.9	$	567.2	$	567.2	$	—

(1) Derivative liabilities are reported in Other Liabilities on the consolidated balance sheets. Other Liabilities (excluding derivative liabilities) totaled $4.0 billion and $3.2 billion as of December 31, 2023 and 2022, respectively.

(2) Offsetting of Securities Sold under Agreements to Repurchase primarily relates to our involvement in the FICC.

(3) Including cash collateral deposited with counterparties.

(4) Including financial assets accepted as collateral which are deposited with counterparties.

(5) Northern Trust did not place any cash collateral with counterparties that was not offset on the consolidated balance sheets that could have been used to offset the net amounts presented on the consolidated balance sheets as of December 31, 2023 and 2022.

All of Northern Trust’s securities sold under agreements to repurchase (repurchase agreements) and securities purchased under agreements to resell (reverse repurchase agreements) involve the transfer of financial assets in exchange for cash subject to a right and obligation to repurchase those assets for an agreed upon amount. In the event of a repurchase failure, the cash or financial assets are available for offset. All of Northern Trust’s repurchase agreements and reverse repurchase agreements are subject to a master netting arrangement, which sets forth the rights and obligations for repurchase and offset. Under the master netting arrangement, Northern Trust is entitled to set off receivables from and collateral placed with a single counterparty against obligations owed to that counterparty. In addition, collateral held by Northern Trust can be offset against receivables from that counterparty. Northern Trust has elected to net securities sold under repurchase agreements against those purchased under resale agreements when the GAAP requirements to net are met.

Derivative asset and liability positions with a single counterparty can be offset against each other in cases where legally enforceable master netting arrangements or similar agreements exist. Derivative assets and liabilities can be further offset by cash collateral received from, and deposited with, the transacting counterparty. The basis for this view is that, upon termination of transactions subject to a master netting arrangement or similar agreement, the individual derivative receivables do not represent resources to which general creditors have rights and individual derivative payables do not represent claims that are equivalent to the claims of general creditors. Northern Trust has elected to net derivative assets

and liabilities when legally enforceable master netting arrangements or similar agreements exist between Northern Trust and the counterparty.

Credit risk associated with derivative instruments relates to the failure of the counterparty and the failure of Northern Trust to pay based on the contractual terms of the agreement, and is generally limited to the unrealized fair value gains and losses on these instruments, net of any collateral received or deposited. The amount of credit risk will increase or decrease during the lives of the instruments as interest rates, foreign exchange rates, or equity prices fluctuate. Northern Trust’s risk is controlled by limiting such activity to an approved list of counterparties and by subjecting such activity to the same credit and quality controls as are followed in lending and investment activities. Credit support annexes and other similar agreements are currently in place with a number of Northern Trust’s counterparties which mitigate the aforementioned credit risk associated with derivative activity conducted with those counterparties by requiring that significant net unrealized fair value gains be supported by collateral placed with Northern Trust.

Additional cash collateral received from and deposited with derivative counterparties totaling $373.1 million and $21.3 million, respectively, as of December 31, 2023, and $131.8 million and $26.3 million, respectively, as of December 31, 2022, was not offset against derivative assets and liabilities on the consolidated balance sheets as the amounts exceeded the net derivative positions with those counterparties.

Certain master netting arrangements Northern Trust enters into with derivative counterparties contain credit risk-related contingent features in which the counterparty has the option to declare Northern Trust in default and accelerate cash settlement of net derivative liabilities with the counterparty in the event Northern Trust’s credit rating falls below specified levels. The aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a liability position was $1.2 billion and $190.9 million at December 31, 2023 and 2022, respectively. Cash collateral amounts deposited with derivative counterparties on those dates included $1.1 billion and $55.1 million, respectively, posted against these liabilities, resulting in a net maximum amount of termination payments that could have been required at December 31, 2023 and 2022 of $52.2 million and $135.8 million, respectively. Accelerated settlement of these liabilities would not have a material effect on the consolidated financial position or liquidity of Northern Trust.

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Variable Interest Entities

12 Months Ended

Dec. 31, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Variable Interest Entities

Variable Interest Entities

Northern Trust is involved with various entities in the normal course of business that are deemed to be variable interest entities (VIEs). VIEs are defined within GAAP as entities which either (1) lack sufficient equity at risk to permit the entity to finance its activities without additional subordinated financial support, (2) have equity investors that lack attributes typical of an equity investor, such as the ability to make significant decisions through voting rights affecting the entity’s operations, or the obligation to absorb expected losses or the right to receive residual returns of the entity, or (3) are structured with voting rights that are disproportionate to the equity investor’s obligation to absorb losses or right to receive returns, and substantially all of the activities are conducted on behalf of the holder of the equity investment at risk with disproportionately few voting rights. Investors that finance a VIE through debt or equity interests are variable interest holders in the entity and the variable interest holder, if any, that has both the power to direct the activities that most significantly impact the entity’s economic performance and, through its variable interest, the obligation to absorb losses or the right to receive returns that could potentially be significant to the entity is deemed to be the VIE’s primary beneficiary and is required to consolidate the VIE.

Tax credit structures. Northern Trust holds tax-advantaged investments in unconsolidated entities that own and operate affordable housing and other community development projects. These entities, which are limited partnerships and similar entities, are primarily VIEs and are designed to generate a return primarily through the realization of tax credits and other tax benefits, such as tax deductions from operating losses of the investments. Northern Trust invests as a limited partner/investor member and lacks both the power to direct the entities’ most significant activities and the obligation to absorb losses or right to receive benefits that could potentially be significant to the entities. Northern Trust is not required to consolidate these entities as it does not have a controlling financial interest and thus is not the primary beneficiary.

Northern Trust’s maximum exposure to loss as a result of its involvement with these entities is limited to the carrying amounts of its investments, including any undrawn commitments. Northern Trust’s funding requirements are limited to its invested capital and undrawn commitments for future equity contributions. Northern Trust has no exposure to loss from liquidity arrangements and no obligation to purchase assets of these entities.

Northern Trust’s investments in these unconsolidated entities and related unfunded commitments are reported in Other Assets and Other Liabilities, respectively, on the consolidated balance sheets.

TABLE 125: SUMMARY OF UNCONSOLIDATED TAX CREDIT STRUCTURES

(In Millions)	DECEMBER 31, 2023		DECEMBER 31, 2022
Investment Carrying Amount
Affordable Housing	$	622.8	$	635.9
Other Community Development	266.3		268.4
Total Investment Carrying Amount(1)	$	889.1	$	904.3
Unfunded Commitments
Affordable Housing	$	178.8	$	218.9
Other Community Development	—		—
Total Unfunded Commitments(2)	$	178.8	$	218.9

(1)    As of December 31, 2023 and December 31, 2022, $857.0 million and $867.2 million are VIEs, respectively.

(2) As of December 31, 2023 and December 31, 2022, $172.0 million and $210.1 million relate to undrawn commitments on VIEs, respectively.

Tax credits and other tax benefits attributable to unconsolidated tax credit structures totaled $113.9 million and $99.1 million, respectively, as of December 31, 2023 and 2022 and are reported in Provision for Income Taxes on the consolidated statements of income.

Investment funds. Northern Trust acts as asset manager for various funds in which clients of Northern Trust are investors. As an asset manager of funds, Northern Trust earns a competitively priced fee that is based on assets managed and varies with each fund’s investment objective. Based on its analysis, Northern Trust has determined that it is not the primary beneficiary of these VIEs under GAAP.

Some of the funds for which Northern Trust acts as asset manager comply or operate in accordance with requirements that are similar to those in Rule 2a-7 of the Investment Company Act of 1940 for registered money market funds and therefore the funds are exempt from the consolidation requirements in ASC 810-10. Northern Trust voluntarily waived $8.8 million and $64.2 million of money market fund fees for the years ended December 31, 2023, and December 31, 2022, respectively, related to certain competitive factors. Northern Trust does not have any contractual obligations to provide financial support to the funds. Any potential future support of the funds will be at the discretion of Northern Trust after an evaluation of the specific facts and circumstances.

Periodically, Northern Trust makes seed capital investments to certain funds. As of December 31, 2023, Northern Trust had no seed capital investments and no unfunded commitments related to seed capital investments. As of December 31, 2022, Northern Trust had $19.9 million of such investments valued using net asset value per share and included in Other Assets and had no unfunded commitments related to seed capital investments.

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Pledged Assets, Accepted Collateral and Restricted Assets

12 Months Ended

Dec. 31, 2023

Financial Instruments Owned and Pledged as Collateral [Abstract]

Pledged Assets, Accepted Collateral and Restricted Assets

Pledged Assets, Accepted Collateral and Restricted Assets

Pledged Assets. For our liquidity management strategy, we may pledge loans and/or securities to various financial market utilities to allow for client payment, clearing and settlement processing as part of our custody services. We may pledge loans or securities to Central Banks, Federal Home Loan Bank (FHLB) of Chicago and third parties for various purposes, for example: securing public and trust deposits, repurchase agreements, borrowings and derivative contracts.

For the year ended December 31, 2023 and 2022, respectively, $1.1 billion and $453.9 million of collateral we pledge, related to loans and/or securities, is eligible to be repledged or sold by the secured party. The following table presents the carrying value of Northern Trust’s pledged assets by type.

TABLE 126: TYPE OF PLEDGED ASSETS

	FOR THE YEAR ENDED DECEMBER 31,
(In Billions)	2023		2022
Debt Securities(1)	$	33.0	$	31.4
Loans(2)	10.3		11.8
Total Pledged Assets	$	43.3	$	43.2

(1) Debt securities are comprised of held to maturity and available for sale securities.

(2) Loans pledged at the FHLB of Chicago and the Federal Reserve Bank of Chicago.

Accepted Collateral. Northern Trust accepts financial assets as collateral that it may, in some instances, be permitted to repledge or sell. The collateral is generally obtained under certain reverse repurchase agreements and derivative contracts. The following table presents the fair value of securities accepted as collateral.

TABLE 127: ACCEPTED COLLATERAL

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022
Collateral that may be repledged or sold
Reverse repurchase agreements(1)	$	62,767.8	$	12,119.4
Derivative contracts	12.2		5.0
Collateral that may not be repledged or sold
Reverse repurchase agreements	—		450.0
Total Collateral Accepted	$	62,780.0	$	12,574.4

(1) The fair value of securities collateral that was repledged or sold totaled $62.0 billion and $11.5 billion at December 31, 2023 and 2022, respectively. This primarily includes collateral accepted as related to the sponsored member program. Refer to Note 24, “Commitments and Contingent Liabilities” and Note 27, “Offsetting of Assets and Liabilities” for further information.

Restricted Assets. Certain cash may be restricted in terms of usage or withdrawal. As a result of the continuing military conflict involving Ukraine and the Russian Federation and related sanctions and legal restrictions in place, cash balances denominated in Russian rubles received for the benefit of certain clients in our Asset Servicing business are subject to distribution restrictions. As of December 31, 2023 and 2022, these balances totaled $722.2 million and $330.4 million, respectively, and are reported in Cash and Due from Banks on the consolidated balance sheet.

At December 31, 2023 and 2022, Northern Trust held cash of $575.2 million and $574.2 million, respectively, to meet non-U.S. reserve requirements. As a result of the economic environment arising from the COVID-19 pandemic, the Federal Reserve reduced the U.S. reserve requirement to zero percent on March 26, 2020. There were no average deposits required to meet Federal Reserve Bank reserve requirements at December 31, 2023 and 2022.

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Restrictions on Subsidiary Dividends and Loans or Advances

12 Months Ended

Dec. 31, 2023

Banking and Thrift, Other Disclosure [Abstract]

Restrictions on Subsidiary Dividends and Loans or Advances

Restrictions on Subsidiary Dividends and Loans or Advances

Various federal and state statutory provisions limit the amount of dividends the Bank can pay to the Corporation without regulatory approval. Approval of the Federal Reserve Board is required for payment of any dividend by a state-chartered bank that is a member of the Federal Reserve System if the total of all dividends declared by the bank in any calendar year would exceed the total of its retained net income (as defined by regulatory agencies) for that year combined with its retained net income for the preceding two years. In addition, a state member bank may not pay a dividend in an amount greater than its “undivided profits,” as defined, without regulatory and stockholder approval.

Under Illinois law, an Illinois state bank, prior to paying a dividend, must carry over to surplus at least one-tenth of its net profits since the date of the declaration of the last preceding dividend, until the bank’s surplus is equal to its capital. In addition, an Illinois state bank may not pay any dividend in an amount greater than its net profits then on hand, after deduction of losses and bad debts (defined as debts due to a state bank on which interest is past due and unpaid for a period of six months or more, unless the same are well secured and in the process of collection).

The Bank is also prohibited under federal law from paying any dividends if the Bank is undercapitalized or if the payment of the dividends would cause the Bank to become undercapitalized. In addition, the federal regulatory agencies are authorized to prohibit a bank or bank holding company from engaging in an unsafe or unsound banking practice. The payment of dividends could, depending on the financial condition of the Bank, be deemed to constitute an unsafe or unsound practice. The Dodd-Frank Act and Basel III impose additional restrictions on the ability of banking institutions to pay dividends (e.g., the Corporation may pay dividends only in accordance with the capital plan rules and capital adequacy standards of the Federal Reserve). Our Bank subsidiary could have declared additional dividends of approximately $1.5 billion at December 31, 2023, without obtaining prior regulatory approval.

Under federal law, financial transactions by the Bank, the Corporation’s insured banking subsidiary, with the Corporation and its affiliates that are in the form of loans or extensions of credit, investments, guarantees, derivative transactions, repurchase agreements, securities lending transactions or purchases of assets, are restricted. These transactions must be on terms and conditions that are, or in good faith would be, offered to non-affiliated companies (i.e. on terms not less favorable to the Bank than market terms). Further, extensions of credit must be secured fully with qualifying collateral and are limited to 10% of the Bank’s capital and surplus for transactions with a single affiliate and to 20% of the Bank’s capital and surplus with all affiliates. Other state and federal laws may limit the transfer of funds by the Corporation’s banking subsidiaries to the Corporation and certain of its affiliates.

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Reporting Segments and Related Information

12 Months Ended

Dec. 31, 2023

Segment Reporting [Abstract]

Reporting Segments and Related Information

Reporting Segments and Related Information

Segment Information. Northern Trust is organized around its two client-focused reporting segments: Asset Servicing and Wealth Management. Asset management and related services are provided to Asset Servicing and Wealth Management clients primarily by the Asset Management business. The revenue and expenses of Asset Management and certain other support functions are allocated fully to Asset Servicing and Wealth Management.

Reporting segment financial information, presented on an internal management-reporting basis, is determined by accounting systems used to allocate revenue and expense to each segment, and incorporates processes for allocating assets, liabilities, equity and the applicable interest income and expense utilizing a funds transfer pricing (FTP) methodology. Under the methodology, assets and liabilities receive a funding charge or credit that considers interest rate risk, liquidity risk, and other product characteristics on an instrument level. Additionally, segment information is presented on a fully taxable equivalent (FTE) basis as management believes an FTE presentation provides a clearer indication of net interest income. The adjustment to an FTE basis has no impact on Net Income.

Equity is allocated to the reporting segments based on a variety of factors including, but not limited to, risk, regulatory considerations, and internal metrics. Allocations of capital and certain corporate expense may not be representative of levels that would be required if the segments were independent entities. The accounting policies used for management reporting are consistent with those described in Note 1, “Summary of Significant Accounting Policies.” Transfers of income and expense items are recorded at cost; there is no consolidated profit or loss on sales or transfers between reporting segments. Northern Trust’s presentations are not necessarily consistent with similar information for other financial institutions.

Revenues, expenses and average assets are allocated to Asset Servicing and Wealth Management, with the exception of non-recurring activities such as certain corporate transactions and costs incurred associated with acquisitions, divestitures, litigation, restructuring, and tax adjustments not directly attributable to a specific reporting segment, which are reported within the Other segment.

Reporting segment results are subject to reclassification when organizational changes are made. The results are also subject to refinements in revenue and expense allocation methodologies, which are typically reflected on a prospective basis.

Asset Servicing. Asset Servicing is a leading global provider of asset servicing and related services to corporate and public retirement funds, foundations, endowments, fund managers, insurance companies, sovereign wealth funds, and other institutional investors around the globe. Asset servicing and related services encompass a full range of capabilities including but not limited to: custody; fund administration; investment operations outsourcing; investment management; investment risk and analytical services; employee benefit services; securities lending; foreign exchange; treasury management; brokerage services; transition management services; banking; and cash management. Client relationships are managed through the Bank and the Bank’s and the Corporation’s other subsidiaries, including support from locations in North America, Europe, the Middle East, and the Asia-Pacific region.

Wealth Management. Wealth Management focuses on high-net-worth individuals and families, business owners, executives, professionals, retirees, and established privately-held businesses in its target markets. In supporting these targeted segments, Wealth Management provides trust, investment management, custody, and philanthropic services; financial consulting; guardianship and estate administration; family business consulting; family financial education; brokerage services; and private and business banking. Wealth Management also includes Global Family Office, which provides customized services, including but not limited to: investment consulting; global custody; fiduciary; and private banking; family office consulting, and technology solutions, to meet the complex financial and reporting needs of ultra-high-net-worth individuals and family offices across the globe. Wealth Management services are delivered by multidisciplinary teams through a network of offices in 19 U.S. states and Washington, D.C., as well as offices in London, Guernsey, and Abu Dhabi.

Other. Income and expenses associated with non-recurring activities such as certain costs associated with acquisitions, divestitures, litigation, restructuring, and tax adjustments are included within Other.

The following tables reflect the earnings contribution and average assets of Northern Trust’s reporting segments for the years ended December 31, 2023, 2022, and 2021. Segment results are stated on an FTE basis which has no impact on net income. Financial measures stated on an FTE basis includes FTE adjustments of $57.5 million, $45.6 million, and $35.6 million for 2023, 2022, and 2021, respectively.

TABLE 128: ASSET SERVICING RESULTS OF OPERATIONS

	FOR THE YEAR ENDED DECEMBER 31,
($ In Millions)	2023			2022			2021
Noninterest Income
Trust, Investment and Other Servicing Fees	$	2,461.9		$	2,496.3		$	2,487.3
Foreign Exchange Trading Income	213.0			281.0			279.0
Other Noninterest Income	263.4			250.7			261.2
Total Noninterest Income	2,938.3			3,028.0			3,027.5
Net Interest Income(1)	1,197.3			1,072.7			637.2
Revenue(1)	4,135.6			4,100.7			3,664.7
Provision for (Release of) Credit Losses	0.5			2.4			(33.8)
Noninterest Expense	3,273.2			3,092.7			2,863.0
Income before Income Taxes(1)	861.9			1,005.6			835.5
Provision for Income Taxes(1)	187.1			243.2			194.1
Net Income	$	674.8		$	762.4		$	641.4
Percentage of Consolidated Net Income	61		%	57		%	41		%
Average Assets	$	101,472.6		$	115,646.4		$	120,883.2

(1) Financial measures stated on an FTE basis.

TABLE 129: WEALTH MANAGEMENT RESULTS OF OPERATIONS

	FOR THE YEAR ENDED DECEMBER 31,
($ In Millions)	2023			2022			2021
Noninterest Income
Trust, Investment and Other Servicing Fees	$	1,899.9		$	1,936.3		$	1,873.8
Foreign Exchange Trading Income (Loss)	(9.1)			7.6			13.6
Other Noninterest Income	150.8			137.7			188.2
Total Noninterest Income	2,041.6			2,081.6			2,075.6
Net Interest Income(1)	842.2			860.1			781.1
Revenue(1)	2,883.8			2,941.7			2,856.7
Provision for (Release of) Credit Losses	24.0			9.6			(47.7)
Noninterest Expense	1,882.3			1,815.5			1,651.1
Income before Income Taxes(1)	977.5			1,116.6			1,253.3
Provision for Income Taxes(1)	245.9			310.0			317.0
Net Income	$	731.6		$	806.6		$	936.3
Percentage of Consolidated Net Income	66		%	60		%	61		%
Average Assets	$	41,176.6		$	36,905.5		$	35,480.0

(1) Financial measures stated on an FTE basis.

TABLE 130: OTHER RESULTS OF OPERATIONS

	FOR THE YEAR ENDED DECEMBER 31,
($ In Millions)	2023			2022			2021
Noninterest Income (Loss)	$	(188.4)		$	(235.6)		$	(21.3)
Net Interest Income(1)	—			—			—
Revenue(1)	(188.4)			(235.6)			(21.3)
Noninterest Expense	128.7			74.7			21.8
Income (Loss) before Income Taxes(1)	(317.1)			(310.3)			(43.1)
Provision (Benefit) for Income Taxes(1)	(18.0)			(77.3)			(10.7)
Net Income (Loss)	$	(299.1)		$	(233.0)		$	(32.4)
Percentage of Consolidated Net Income (Loss)	(27)		%	(17)		%	(2)		%
Average Assets	$	—		$	—		$	—

(1) Financial measures stated on an FTE basis.

TABLE 131: CONSOLIDATED FINANCIAL INFORMATION

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Noninterest Income
Trust, Investment and Other Servicing Fees	$	4,361.8	$	4,432.6	$	4,361.1
Foreign Exchange Trading Income	203.9		288.6		292.6
Other Noninterest Income	225.8		152.8		428.1
Total Noninterest Income	4,791.5		4,874.0		5,081.8
Net Interest Income	1,982.0		1,887.2		1,382.7
Revenue	6,773.5		6,761.2		6,464.5
Provision for (Release of) Credit Losses	24.5		12.0		(81.5)
Noninterest Expense	5,284.2		4,982.9		4,535.9
Income before Income Taxes	1,464.8		1,766.3		2,010.1
Provision for Income Taxes	357.5		430.3		464.8
Net Income	$	1,107.3	$	1,336.0	$	1,545.3
Average Assets	$	142,649.2	$	152,551.9	$	156,363.2

Geographic Area Information. Northern Trust’s non-U.S. activities are primarily related to its asset servicing, asset management, foreign exchange, cash management, and commercial banking businesses. The operations of Northern Trust are managed on a reporting segment basis and include components of both U.S and non-U.S. source income and assets. Non-U.S. source income and assets are not separately identified in Northern Trust’s internal management reporting system. However, Northern Trust is required to disclose non-U.S. activities based on the domicile of the customer. Due to the complex and integrated nature of Northern Trust’s activities, it is difficult to segregate with precision revenues, expenses and assets between U.S. and non-U.S.-domiciled customers. Therefore, certain subjective estimates and assumptions have been made to allocate revenues, expenses and assets between U.S. and non-U.S. operations.

For purposes of this disclosure, all foreign exchange trading income has been allocated to non-U.S. operations. Interest expense is allocated to non-U.S. operations based on specifically matched or pooled funding. Allocations of indirect noninterest expenses, when made, are based on various methods such as time, space, and number of employees.

The following table summarizes Northern Trust’s performance based on the allocation process described above without regard to guarantors or the location of collateral.

TABLE 132: DISTRIBUTION OF TOTAL ASSETS AND OPERATING PERFORMANCE

($ In Millions)	TOTAL ASSETS		% OF TOTAL		TOTAL REVENUE(1)		% OF TOTAL		INCOME BEFORE INCOME TAXES		% OF TOTAL		NET INCOME		% OF TOTAL
2023
Non-U.S.	$	39,661.5	26	%	$	2,156.1	32	%	$	473.7	32	%	$	354.0	32	%
U.S.	111,121.6		74	%	4,617.4		68	%	991.1		68	%	753.3		68	%
Total	$	150,783.1	100	%	$	6,773.5	100	%	$	1,464.8	100	%	$	1,107.3	100	%
2022
Non-U.S.	$	35,991.3	23	%	$	2,273.3	34	%	$	560.9	32	%	$	420.2	31	%
U.S.	119,045.4		77	%	4,487.9		66	%	1,205.4		68	%	915.8		69	%
Total	$	155,036.7	100	%	$	6,761.2	100	%	$	1,766.3	100	%	$	1,336.0	100	%
2021
Non-U.S.	$	38,555.3	21	%	$	2,017.5	31	%	$	569.4	28	%	$	426.7	28	%
U.S.	145,334.5		79	%	4,447.0		69	%	1,440.7		72	%	1,118.6		72	%
Total	$	183,889.8	100	%	$	6,464.5	100	%	$	2,010.1	100	%	$	1,545.3	100	%

(1) Total revenue is comprised of net interest income and noninterest income.

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Regulatory Capital Requirements

12 Months Ended

Dec. 31, 2023

Regulatory Capital Requirements Abstract [Abstract]

Regulatory Capital Requirements

Regulatory Capital Requirements

The Corporation and the Bank are subject to various regulatory capital requirements administered by the federal bank regulatory authorities. Under these requirements, banks must maintain specific risk-based capital and leverage ratios in order to be classified as “well-capitalized.” The regulatory capital requirements impose certain restrictions upon banks that meet minimum capital requirements but are not “well-capitalized” and obligate the federal bank regulatory authorities to take “prompt corrective action” with respect to banks that do not maintain such minimum ratios. Such prompt corrective action could have a direct material effect on a bank’s financial statements.

As of December 31, 2023 and 2022, the Bank had capital ratios above the levels required for classification as a “well-capitalized” institution and had not received any regulatory notification of a lower classification. The results of the 2023 DFAST, published by the Federal Reserve Board on June 28, 2023, resulted in Northern Trust’s stress capital buffer and effective Common Equity Tier 1 capital ratio minimum requirement remaining constant at 2.5% and 7.0%, respectively, for the annual capital plan cycle, which began on October 1, 2023 and continues through September 30, 2024.

Additionally, Northern Trust’s subsidiary banks located outside the U.S. are subject to regulatory capital requirements in the jurisdictions in which they operate. As of December 31, 2023 and 2022, Northern Trust’s non-U.S. banking subsidiaries had capital ratios above their specified minimum requirements. There were no conditions or events since December 31, 2023, that management believes have adversely affected the capital categorization of any Northern Trust subsidiary bank. The following table provides capital ratios for the Corporation and the Bank determined by Basel III phased in requirements.

TABLE 133: RISK-BASED AND LEVERAGE CAPITAL AMOUNTS AND RATIOS

	DECEMBER 31, 2023								DECEMBER 31, 2022
($ In Millions)	STANDARDIZED APPROACH				ADVANCED APPROACH				STANDARDIZED APPROACH				ADVANCED APPROACH
	BALANCE		RATIO		BALANCE		RATIO		BALANCE		RATIO		BALANCE		RATIO
Common Equity Tier 1 Capital
Northern Trust Corporation	$	10,179.4	11.4	%	$	10,179.4	13.4	%	$	9,539.7	10.8	%	$	9,539.7	11.5	%
The Northern Trust Company	10,806.2		12.2		10,806.2		14.6		10,111.2		11.6		10,111.2		12.4
Minimum to qualify as well-capitalized:
Northern Trust Corporation	N/A		N/A		N/A		N/A		N/A		N/A		N/A		N/A
The Northern Trust Company	5,768.4		6.5		4,808.6		6.5		5,684.4		6.5		5,286.2		6.5
Tier 1 Capital
Northern Trust Corporation	11,023.9		12.3		11,023.9		14.5		10,397.4		11.8		10,397.4		12.5
The Northern Trust Company	10,806.2		12.2		10,806.2		14.6		10,111.2		11.6		10,111.2		12.4
Minimum to qualify as well-capitalized:
Northern Trust Corporation	5,371.6		6.0		4,558.8		6.0		5,286.5		6.0		4,990.9		6.0
The Northern Trust Company	7,099.5		8.0		5,918.3		8.0		6,996.2		8.0		6,506.1		8.0
Total Capital
Northern Trust Corporation	12,733.9		14.2		12,514.7		16.5		12,245.5		13.9		12,045.9		14.5
The Northern Trust Company	12,279.3		13.8		12,060.2		16.3		11,766.8		13.5		11,567.2		14.2
Minimum to qualify as well-capitalized:
Northern Trust Corporation	8,952.7		10.0		7,598.0		10.0		8,810.8		10.0		8,318.1		10.0
The Northern Trust Company	8,874.4		10.0		7,397.9		10.0		8,745.3		10.0		8,132.6		10.0
Tier 1 Leverage
Northern Trust Corporation	11,023.9		8.1		11,023.9		8.1		10,397.4		7.1		10,397.4		7.1
The Northern Trust Company	10,806.2		8.0		10,806.2		8.0		10,111.2		6.9		10,111.2		6.9
Minimum to qualify as well-capitalized:
Northern Trust Corporation	N/A		N/A		N/A		N/A		N/A		N/A		N/A		N/A
The Northern Trust Company	6,764.0		5.0		6,764.0		5.0		7,323.8		5.0		7,323.8		5.0
Supplementary Leverage(1)
Northern Trust Corporation	N/A		N/A		11,023.9		8.6		N/A		N/A		10,397.4		7.9
The Northern Trust Company	N/A		N/A		10,806.2		8.5		N/A		N/A		10,111.2		7.7
Minimum to qualify as well-capitalized:
Northern Trust Corporation	N/A		N/A		N/A		N/A		N/A		N/A		N/A		N/A
The Northern Trust Company	N/A		N/A		3,825.6		3.0		N/A		N/A		3,931.5		3.0

(1) In November 2019, the Federal Reserve Board and other U.S. federal banking agencies adopted a final rule that established a deduction for central bank deposits from the total leverage exposures of custodial banking organizations, including the Corporation and the Bank, equal to the lesser of (i) the total amount of funds the custodial banking organization and its consolidated subsidiaries have on deposit at qualifying central banks and (ii) the total amount of client funds on deposit at the custodial banking organization that are linked to fiduciary or custodial and safekeeping accounts. The rule became effective on April 1, 2020.

The supplementary leverage ratios at December 31, 2023 and December 31, 2022 for the Corporation and the Bank reflect the impact of the final rule.    

Under the final Basel III rules, the Corporation and the Bank are required to calculate and publicly disclose risk-based capital ratios using two methodologies: an advanced approach and a standardized approach. Under the advanced approach, credit RWA are based on internal credit models and parameters. Additionally, the advanced approach incorporates operational risk RWA. Under the standardized approach, RWA are based on supervisory prescribed risk weights that are primarily dependent on counterparty type and asset class.

Pursuant to the Federal Reserve Board's implementation in the final Basel III rules of a provision of the Dodd-Frank Act, the capital adequacy of the Corporation and the Bank is assessed based on the lower of the advanced approach or standardized approach capital ratios.

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Northern Trust Corporation (Corporation only)

12 Months Ended

Dec. 31, 2023

Condensed Financial Information Disclosure [Abstract]

Northern Trust Corporation (Corporation only)

Northern Trust Corporation (Corporation only)

Condensed financial information is presented in the following tables. Investments in wholly-owned subsidiaries are carried on the equity method of accounting.

TABLE 134: CONDENSED BALANCE SHEETS

	DECEMBER 31,
(In Millions)	2023		2022
ASSETS
Cash on Deposit with Subsidiary Bank	$	795.5	$	601.4
Advances to Wholly-Owned Subsidiaries – Banks	3,760.0		4,010.0
Investments in Wholly-Owned Subsidiaries – Banks	11,591.4		10,897.1
– Nonbank	209.7		194.7
Other Assets	1,233.1		1,226.3
Total Assets	$	17,589.7	$	16,929.5
LIABILITIES
Senior Notes	$	2,773.2	$	2,724.2
Long-Term Debt	2,065.0		2,066.2
Other Liabilities	853.6		879.6
Total Liabilities	5,691.8		5,670.0
STOCKHOLDERS’ EQUITY
Preferred Stock	884.9		884.9
Common Stock	408.6		408.6
Additional Paid-in Capital	1,009.6		983.5
Retained Earnings	14,233.8		13,798.5
Accumulated Other Comprehensive Income (Loss)	(1,137.9)		(1,569.2)
Treasury Stock	(3,501.1)		(3,246.8)
Total Stockholders’ Equity	11,897.9		11,259.5
Total Liabilities and Stockholders’ Equity	$	17,589.7	$	16,929.5

TABLE 135: CONDENSED STATEMENTS OF INCOME

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
OPERATING INCOME
Dividends – Bank Subsidiaries	$	850.0	$	—	$	751.1
– Nonbank Subsidiaries	—		—		8.3
Intercompany Interest and Other Charges	260.2		112.8		20.1
Interest and Other Income	12.2		(5.7)		32.3
Total Operating Income	1,122.4		107.1		811.8
OPERATING EXPENSES
Interest Expense	279.5		132.3		71.3
Other Operating Expenses	32.3		11.9		36.7
Total Operating Expenses	311.8		144.2		108.0
Income (Loss) before Income Taxes and Equity in Undistributed Net Income of Subsidiaries	810.6		(37.1)		703.8
Benefit for Income Taxes	12.4		16.9		25.7
Income (Loss) before Equity in Undistributed Net Income of Subsidiaries	823.0		(20.2)		729.5
Equity in Undistributed Net Income of Subsidiaries – Banks	269.4		1,338.5		803.3
– Nonbank	14.9		17.7		12.5
Net Income	$	1,107.3	$	1,336.0	$	1,545.3
Preferred Stock Dividends	41.8		41.8		41.8
Net Income Applicable to Common Stock	$	1,065.5	$	1,294.2	$	1,503.5

TABLE 136: CONDENSED STATEMENTS OF CASH FLOWS

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	$	1,107.3	$	1,336.0	$	1,545.3
Adjustments to Reconcile Net Income to Net Cash Provided by (Used in) Operating Activities
Equity in Undistributed Net Income of Subsidiaries	(284.3)		(1,356.2)		(815.8)
Change in Prepaid Expenses	1.7		(3.8)		0.1
Change in Accrued Income Taxes	(10.2)		36.6		2.2
Other Operating Activities, net	138.1		(608.2)		236.6
Net Cash Provided by (Used in) Operating Activities	952.6		(595.6)		968.4
CASH FLOWS FROM INVESTING ACTIVITIES
Investments in and Advances to Subsidiaries, net	250.0		(1,200.1)		(140.0)
Other Investing Activities, net	—		(0.1)		5.1
Net Cash Provided by (Used in) Investing Activities	250.0		(1,200.2)		(134.9)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from Senior Notes	—		1,988.8		—
Repayments of Senior Notes	—		(500.0)		(500.0)
Repayment of Floating Rate Capital Debt	—		—		(278.8)
Treasury Stock Purchased	(347.5)		(35.4)		(267.6)
Net Proceeds from Stock Options	2.3		3.9		53.8
Cash Dividends Paid on Common Stock	(621.5)		(750.2)		(583.3)
Cash Dividends Paid on Preferred Stock	(41.8)		(46.5)		(41.8)
Other Financing Activities, net	—		4.9		(0.1)
Net Cash (Used in) Provided by Financing Activities	(1,008.5)		665.5		(1,617.8)
Net Change in Cash on Deposit with Subsidiary Bank	194.1		(1,130.3)		(784.3)
Cash on Deposit with Subsidiary Bank at Beginning of Year	601.4		1,731.7		2,516.0
Cash on Deposit with Subsidiary Bank at End of Year	$	795.5	$	601.4	$	1,731.7

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Subsequent Events	12 Months Ended
	Dec. 31, 2023
Subsequent Events [Abstract]
Subsequent Events	Subsequent EventsIn January 2024, the Corporation sold certain available-for-sale debt securities with an amortized cost of $2.2 billion that were in an unrealized loss position in conjunction with a repositioning of the portfolio. As a result, the Corporation recognized a $189.4 million loss recorded in Investment Security Gains (Losses), net on the consolidated statements of income in the first quarter of 2024. The $189.4 million realized loss includes $18.4 million of cumulative hedge accounting basis adjustments related to discontinued fair value hedging relationships of certain available-for-sale debt securities sold.

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Pay vs Performance Disclosure - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pay vs Performance Disclosure
Net Income	$ 1,107.3	$ 1,336.0	$ 1,545.3

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Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

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Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation. The consolidated financial statements include the accounts of Northern Trust Corporation (Corporation) and its wholly-owned subsidiary, The Northern Trust Company (Bank), and various other wholly-owned subsidiaries of the Corporation and Bank. Throughout the notes to the consolidated financial statements, the term “Northern Trust” refers to the Corporation and its subsidiaries. Intercompany balances and transactions have been eliminated in consolidation. The consolidated statements of income include results of acquired subsidiaries from the dates of acquisition. Certain prior-year balances have been reclassified consistent with the current year’s presentation.

Nature of Operations

Nature of Operations. The Corporation is a bank holding company that has elected to be a financial holding company under the Bank Holding Company Act of 1956, as amended. The Bank is an Illinois banking corporation headquartered in Chicago and the Corporation’s principal subsidiary. The Corporation conducts business in the United States (U.S.) and internationally through various U.S. and non-U.S. subsidiaries, including the Bank.

Northern Trust generates the majority of its revenue from its two client-focused reporting segments: Asset Servicing and Wealth Management. Asset management and related services are provided to Asset Servicing and Wealth Management clients primarily by the Asset Management business.

Asset Servicing is a leading global provider of asset servicing and related services to corporate and public retirement funds, foundations, endowments, fund managers, insurance companies, sovereign wealth funds, and other institutional investors around the globe. Asset servicing and related services encompass a full range of capabilities including but not limited to: custody; fund administration; investment operations outsourcing; investment management; investment risk and analytical services; employee benefit services; securities lending; foreign exchange; treasury management; brokerage services; transition management services; banking; and cash management. Client relationships are managed through the Bank and the Bank’s and the Corporation’s other subsidiaries, including support from locations in North America, Europe, the Middle East, and the Asia-Pacific region.

Wealth Management focuses on high-net-worth individuals and families, business owners, executives, professionals, retirees, and established privately-held businesses in its target markets. In supporting these targeted segments, Wealth Management provides trust, investment management, custody, and philanthropic services; financial consulting; guardianship and estate administration; family business consulting; family financial education; brokerage services; and private and business banking. Wealth Management also includes Global Family Office, which provides customized services, including but not limited to: investment consulting; global custody; fiduciary; and private banking; family office consulting, and technology solutions, to meet the complex financial and reporting needs of ultra-high-net-worth individuals and family offices across the globe. Wealth Management services are delivered by multidisciplinary teams through a network of offices in 19 U.S. states and Washington, D.C., as well as offices in London, Guernsey, and Abu Dhabi.

Use of Estimates in the Preparation of Financial Statements

Use of Estimates in the Preparation of Financial Statements. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions in the application of certain of our significant accounting policies that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenue and expense during the reporting period. Actual results could differ from those estimates.

Foreign Currency Remeasurement and Translation

Foreign Currency Remeasurement and Translation. Asset and liability accounts denominated in nonfunctional currencies are remeasured into functional currencies at period-end rates of exchange, except for certain balance sheet items including but not limited to buildings and equipment, goodwill and other intangible assets, which are remeasured at historical exchange rates. Results from remeasurement of asset and liability accounts are reported in Other Operating Income on the consolidated statements of income. Income and expense accounts are remeasured at period-average rates of exchange.

Asset and liability accounts of entities with functional currencies that are not the U.S. dollar are translated at period-end rates of exchange. Income and expense accounts are translated at period-average rates of exchange. Translation adjustments, net of applicable taxes, are reported directly to accumulated other comprehensive income (AOCI), a component of stockholders’ equity.

Securities

Securities. Available for Sale (AFS) Securities are reported at fair value, with unrealized gains and losses credited or charged, net of the tax effect, to AOCI. Realized gains and losses on AFS securities are determined on a specific identification basis and are reported within Investment Security Gains (Losses), net, on the consolidated statements of

income. Interest income is recorded on the accrual basis, adjusted for the amortization of premium and accretion of discount.

Held to Maturity (HTM) Securities consist of debt securities that management intends to, and Northern Trust has the ability to, hold until maturity. Such securities are reported at cost, adjusted for amortization of premium and accretion of discount. Interest income is recorded on the accrual basis adjusted for the amortization of premium and accretion of discount.

Held for Trading Securities are reported at fair value. Realized and unrealized gains and losses on securities held for trading are reported within Security Commissions and Trading Income on the consolidated statements of income.

Nonmarketable Securities primarily consist of Federal Reserve Bank of Chicago and Federal Home Loan Bank stock and community development investments, each of which are recorded in Other Assets on the consolidated balance sheets. Federal Reserve Bank of Chicago and Federal Home Loan Bank stock are reported at cost, which represents redemption value. Community development investments are typically reported at amortized cost. Those community development investments that are designed to generate a return primarily through realization of tax credits and other tax benefits, which are discussed in further detail in Note 28, “Variable Interest Entities,” are amortized over the lives of the related tax credits and other tax benefits.

Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repurchase

Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repurchase. Securities purchased under agreements to resell and securities sold under agreements to repurchase are accounted for as collateralized financings and recorded at the amounts at which the securities were acquired or sold plus accrued interest. To minimize any potential credit risk associated with these transactions, the fair value of the securities purchased or sold is monitored, limits are set on exposure with counterparties, and the financial condition of counterparties is regularly assessed. It is Northern Trust’s policy to take possession, either directly or via third-party custodians, of securities purchased under agreements to resell. Securities sold under agreements to repurchase are either directly held by, or pledged to the counterparty until the repurchase. Northern Trust nets securities sold under agreements to repurchase against those purchased under agreements to resell when the requirements to net are met.

Derivative Financial Instruments

Derivative Financial Instruments. Northern Trust is a party to various derivative financial instruments that are used in the normal course of business to meet the needs of its clients, as part of its trading activity for its own account, and as part of its risk management activities. These instruments generally include foreign exchange contracts, interest rate contracts, total return swap contracts and credit default swap contracts. All derivative financial instruments, whether designated as hedges or not, are recorded at fair value within Other Assets and Other Liabilities on the consolidated balance sheets. Derivative asset and liability positions with the same counterparty are reflected on a net basis on the consolidated balance sheets in cases where legally enforceable master netting arrangements or similar agreements exist. These derivative assets and liabilities are further reduced by cash collateral received from, and deposited with, derivative counterparties. The accounting for changes in the fair value of a derivative on the consolidated statements of income depends on whether or not the contract has been designated as a hedge and qualifies for hedge accounting under GAAP. Derivative financial instruments are recorded within the line item, Other Operating Activities, net, on the consolidated statement of cash flows, except for net investment hedges which are recorded within Other Investing Activities, net.

Changes in the fair value of client-related and trading derivative instruments, which are not designated hedges under GAAP, are recognized currently in either Foreign Exchange Trading Income or Security Commissions and Trading Income on the consolidated statements of income. Changes in the fair value of derivative instruments entered into for risk management purposes but not designated as hedges are recognized currently in Other Operating Income on the consolidated statements of income. Certain derivative instruments used by Northern Trust to manage risk are formally designated and qualify for hedge accounting as fair value, cash flow, or net investment hedges.

Derivatives designated as fair value hedges are used to limit Northern Trust’s exposure to changes in the fair value of assets and liabilities due to movements in interest rates. Changes in the fair value of the derivative instrument and changes in the fair value of the hedged asset or liability attributable to the hedged risk are recognized currently in Interest Income or Interest Expense on the consolidated statements of income. For substantially all fair value hedges, Northern Trust applies the “shortcut” method of accounting, available under GAAP. As a result, changes recorded in the fair value of the hedged item are assumed to equal the offsetting gain or loss on the derivative. For fair value hedges that do not qualify for the “shortcut” method of accounting, Northern Trust utilizes regression analysis in assessing whether these hedging relationships are highly effective at inception and quarterly thereafter.

Derivatives designated as cash flow hedges are used to minimize the variability in cash flows of earning assets or forecasted transactions caused by movements in interest or foreign exchange rates. Changes in the fair value of such derivatives are recognized in AOCI, a component of stockholders’ equity, and there is no change to the accounting for the hedged item. Balances in AOCI are reclassified to earnings when the hedged forecasted transaction impacts earnings, and are reflected in the same income statement line item. Northern Trust applies the “shortcut” method of accounting for cash flow hedges of certain available for sale investment securities. For cash flow hedges of certain other available for sale

investment securities, foreign currency denominated investment securities, and forecasted foreign currency denominated revenue and expenditure transactions, Northern Trust closely matches all terms of the hedged item and hedging derivative at inception and on an ongoing basis. For cash flow hedges of available for sale investment securities, to the extent all terms are not perfectly matched, effectiveness is assessed using regression analysis. For cash flow hedges of forecasted foreign currency denominated revenue and expenditure transactions and investment securities, to the extent all terms are not perfectly matched, effectiveness is assessed using the dollar-offset method.

Foreign exchange contracts and qualifying non-derivative instruments designated as net investment hedges are used to minimize Northern Trust’s exposure to variability in the foreign currency translation of net investments in non-U.S. branches and subsidiaries. Changes in the fair value of the hedging instrument are recognized in AOCI consistent with the related translation gains and losses of the hedged net investment. For net investment hedges, all critical terms of the hedged item and the hedging instrument are matched at inception and on an ongoing basis. Amounts recorded in AOCI are reclassified to earnings only upon the sale or liquidation of an investment in a non-U.S. branch or subsidiary.

Fair value, cash flow, and net investment hedges are designated and formally documented as such contemporaneous with the transaction. The formal documentation describes the hedge relationship and identifies the hedging instruments and hedged items. Included in the documentation is a discussion of the risk management objectives and strategies for undertaking such hedges, the nature of the risk being hedged, and a description of the method for assessing hedge effectiveness at inception and on an ongoing basis. For hedges that do not qualify for the “shortcut” or the critical terms match methods of accounting, a formal assessment is performed on a calendar quarter basis to verify that derivatives used in hedging transactions continue to be highly effective in offsetting the changes in fair value or cash flows of the hedged item. Hedge accounting is discontinued if a derivative ceases to be highly effective, matures, is terminated or sold, if a hedged forecasted transaction is no longer expected to occur, or if Northern Trust removes the derivative’s hedge designation. Subsequent gains and losses on these derivatives are included in Foreign Exchange Trading Income or Security Commissions and Trading Income on the consolidated statements of income. For discontinued cash flow hedges, the accumulated gain or loss on the derivative remains in AOCI and is reclassified to earnings in the period in which the previously hedged forecasted transaction impacts earnings or is no longer probable of occurring. For discontinued fair value hedges, the previously hedged asset or liability ceases to be adjusted for changes in its fair value. Previous adjustments to the hedged item are amortized over the remaining life of the hedged item.

Loans

Loans. Loans are recognized assets that represent a contractual right to receive money either on demand or on fixed or determinable dates. Loans are disaggregated for disclosure purposes by portfolio segment (segment) and by class. Northern Trust has defined its segments as commercial and personal. A class of loans is a subset of a segment, the components of which have similar risk characteristics, measurement attributes, or risk monitoring methods. The classes within the commercial segment have been defined as commercial and institutional, commercial real estate, non-U.S. and other. The classes within the personal segment have been defined as residential real estate, private client and other.

Loan Classification. Loans that are held for investment are reported at the principal amount outstanding, net of unearned income. Loans classified as held for sale are reported at the lower of cost or fair value. Undrawn commitments relating to loans that are not held for sale are recorded in Other Liabilities and are carried at the amount of unamortized fees with an allowance for credit loss liability recognized for any estimated expected losses.

Nonaccrual Loans and Recognition of Income. Interest income on loans is recorded on an accrual basis unless, in the opinion of management, there is a question as to the ability of the debtor to meet the terms of the loan agreement, or interest or principal is more than 90 days contractually past due and the loan is not well-secured and in the process of collection. Loans meeting such criteria are classified as nonaccrual and interest income is recorded on a cash basis. Past due status is based on how long since the contractual due date a principal or interest payment has been past due. For disclosure purposes, loans that are 29 days past due or less are reported as current. At the time a loan is determined to be nonaccrual, interest accrued but not collected is reversed against interest income in the current period. Interest collected on nonaccrual loans is applied to principal unless, in the opinion of management, collectability of principal is not in doubt. Management’s assessment of indicators of loan collectability, and its policies relative to the recognition of interest income, including the suspension and subsequent resumption of income recognition, do not meaningfully vary between the different loan classes. Nonaccrual loans are returned to performing status when factors indicating doubtful collectability no longer exist. Factors considered in returning a loan to performing status are consistent across all classes of loans and, in accordance with regulatory guidance, relate primarily to expected payment performance. A loan is eligible to be returned to performing status when: (i) no principal or interest that is due is unpaid and repayment of the remaining contractual principal and interest is expected or (ii) the loan has otherwise become well-secured (possessing realizable value sufficient to discharge the debt, including accrued interest, in full) and is in the process of collection (through action reasonably expected to result in debt repayment or restoration to a current status in the near future). A loan that has not been brought fully current may be restored to performing status provided there has been a sustained period of repayment performance (generally a minimum of six payment periods) by the borrower in accordance with the contractual terms, and Northern Trust is reasonably assured of repayment within a reasonable period of time. Additionally, a loan that has been formally

restructured so as to be reasonably assured of repayment and performance according to its modified terms may be returned to accrual status, provided there was a well-documented credit evaluation of the borrower’s financial condition and prospects of repayment under the revised terms, and there has been a sustained period of repayment performance (generally a minimum of six payment periods) under the revised terms.

Loan Modifications to Borrowers Experiencing Financial Difficulty - After the Adoption of Accounting Standards Update No. 2022-02. For borrowers experiencing financial difficulties, Northern Trust may provide payment relief by modifying the terms of the original loan. Loan modifications to borrowers experiencing financial difficulty involve primarily the extensions of term, deferrals of principal and interest, interest rate concessions, and other modifications or a combination thereof. Northern Trust considers payment deferrals of less than 90 days as insignificant, absent any material modifications to other loan terms.

The expected credit loss for modifications to borrowers experiencing financial difficulty is measured based on either the expected future cash flows, the value of collateral, or other factors that may impact the borrower’s ability to pay. When the discounted cash flow method is applied, the expected credit loss reflects the difference between the amortized cost basis and the present value of the expected cash flows and is measured based upon the present value of expected future cash flows, discounted at the post-modification effective interest rate and contractual terms. If a loan’s contractual interest rate varies based on subsequent changes in an independent factor, such as an index or rate, the loan’s effective interest rate is calculated based on the factor as it changes over the life of the loan. Northern Trust elected not to project changes in the factor for purposes of estimating expected future cash flows. If the loan is collateral dependent, the expected loss is measured based on the fair value of the collateral at the reporting date.

If the loan valuation is less than the recorded value of the loan, either an allowance is established or a charge-off is recorded for the difference. The nature and extent of further deterioration in credit quality, including a subsequent default, is considered in the determination of an appropriate level of allowance for credit losses for all loan modifications to borrowers experiencing financial difficulty.

Troubled Debt Restructurings (TDRs) - Prior to the Adoption of Accounting Standards Update No. 2022-02. A loan that was modified as a concession by Northern Trust or a bankruptcy court resulting from the debtor’s financial difficulties was referred to as a troubled debt restructuring (TDR). All TDRs were reported starting in the calendar year of their restructuring. In subsequent years, a TDR may have ceased to be reported if the loan was modified at a market rate and performed according to the modified terms for at least six payment periods. A loan that was modified at a below market rate was returned to accrual status if it satisfied the six-payment-period performance requirement.

The expected credit loss was measured based upon the present value of expected future cash flows, discounted at the effective interest rate based on the original contractual rate. If a loan’s contractual interest rate varied based on subsequent changes in an independent factor, such as an index or rate, the loan’s effective interest rate was calculated based on the factor as it changed over the life of the loan. Northern Trust elected not to project changes in the factor for purposes of estimating expected future cash flows. Further, Northern Trust elected not to adjust the effective interest rate for prepayments. If the loan was collateral dependent, the expected loss was measured based on the fair value of the collateral at the reporting date.

If the loan valuation was less than the recorded value of the loan, either an allowance was established, or a charge-off was recorded, for the difference. Smaller balance (individually less than $1 million) homogeneous loans were collectively evaluated.

All loans with TDR modifications were evaluated for additional expected credit losses. The nature and extent of further deterioration in credit quality, including a subsequent default, was considered in the determination of an appropriate level of allowance for credit losses.

Collateral Dependent Financial Assets. A financial asset is collateral-dependent when the borrower is experiencing financial difficulty and repayment is expected to be provided substantially through the sale or operation of the collateral. Most of Northern Trust’s collateral dependent credit exposure relates to its residential real estate portfolio for which the collateral is usually the underlying real estate property. For collateral dependent financial assets, it is Northern Trust’s policy to reserve or charge-off the difference between the amortized cost basis of the loan and the value of the collateral.

Premium, Discounts, Origination Costs and Fees. Premiums and discounts on loans are recognized as an adjustment of yield using the interest method based on the contractual terms of the loan. Certain direct origination costs and fees are netted, deferred and amortized over the life of the related loan as an adjustment to the loan’s yield.

Allowance for Credit Losses

Allowance for Credit Losses. The allowance for credit losses represents management’s best estimate of lifetime expected credit losses related to various financial assets subject to credit risk and off-balance sheet credit exposure.

Northern Trust measures expected credit losses of financial assets with similar risk characteristics on a collective basis. A financial asset is measured individually if it does not share similar risk characteristics with other financial assets and the related allowance is determined through an individual evaluation.

Management’s estimates utilized in establishing an appropriate level of allowance for credit losses are not dependent on any single assumption. In determining an appropriate allowance level, management evaluates numerous variables, many

of which are interrelated or dependent on other assumptions and estimates, and takes into consideration past events, current conditions and reasonable and supportable forecasts.

Forecasting and Reversion. Estimating expected lifetime credit losses requires the consideration of the effect of future economic conditions. Northern Trust employs multiple scenarios over a reasonable and supportable period (currently two years) to project future conditions. Key variables determined to be relevant for projecting credit losses on the portfolios in scope include macroeconomic factors, such as corporate profits, unemployment, and real estate price indices, as well as financial market factors such as equity prices, volatility, and credit spreads. For periods beyond the reasonable and supportable period, Northern Trust reverts to its own historical loss experiences on a straight-line basis over four quarters.

Allowance for Loans. The allowance estimation methodology for the collective assessment is based on data representative of the Corporation’s financial asset portfolio from a historical observation period that includes both expansionary and recessionary periods. The estimation methodology and the related qualitative adjustment framework segregate the loan portfolio into homogeneous segments based on similar risk characteristics or risk monitoring methods.

Northern Trust utilizes a quantitative probability of default/loss given default approach for the calculation of its credit allowance on a collective basis. For each of the different parameters, specific credit models or qualitative estimation methodologies for the individual loan segments were developed. For each segment, the probability of default and the loss given default are applied to the exposure at default for each projected quarter to determine the quantitative component of the allowance. The quantitative allowance is then reviewed within a qualitative adjustment framework, through which management applies judgment by assessing internal risk factors, potential limitations in the quantitative methodology, and environmental factors that are not fully contemplated in the forecast to compute an adjustment to the quantitative allowance for each segment and class of the loan portfolio.

The allowance related to credit exposures evaluated on an individual basis is determined through evaluations of individual loans, and lending-related commitments that have defaulted, generally those with Borrower Ratings of 8 and 9, that are based on expected future cash flows, the value of collateral, and other factors that may impact the borrowers’ ability to pay. For defaulted loans for which the amount of allowance, if any, is determined based on the value of the underlying collateral, third-party appraisals are typically obtained and utilized by management. These appraisals are generally less than twelve months old and are subject to adjustments to reflect management’s judgment as to the realizable value of the collateral.

Northern Trust analyzes its exposure to credit losses from both on-balance sheet and off-balance sheet activity using a consistent methodology for the quantitative framework as well as the qualitative framework. For purposes of estimating the allowance for credit losses for undrawn loan commitments and standby letters of credit, the exposure at default includes estimated drawdowns of the undrawn commitments based on credit utilization factors, resulting in a proportionate amount of expected credit losses.

Allowance for HTM Securities. HTM debt securities classified as U.S. government, government sponsored agency, and certain securities classified as obligations of states and political subdivisions are considered to be guarantees of the U.S. government or an agency of the U.S. government, and therefore an allowance for credit losses is not estimated for such investments as the expected probability of non-payment of the amortized cost basis is zero.

HTM debt securities classified as “other asset-backed securities” represent pools of underlying receivables from which the cash flows are used to pay the bonds that vary in seniority. Utilizing a qualitative estimation approach, the allowance for other asset-backed securities is assessed by evaluating underlying pool performance based on delinquency rates and available credit support.

HTM debt securities classified as “other” relate to investments purchased by Northern Trust to fulfill its obligations under the Community Reinvestment Act (CRA). Northern Trust fulfills its obligations under the CRA by making qualified investments for purposes of supporting institutions and programs that benefit low-to-moderate income communities within Northern Trust’s market area. The allowance for CRA investments is assessed using a qualitative estimation approach primarily based on internal historical performance experience and default history of the underlying CRA portfolios to determine a quantitative component of the allowance.

The allowance estimation methodology for all other HTM debt securities is developed using a combination of external and internal data. The estimation methodology groups securities with shared characteristics for which the probability of default and the loss given default are applied to the total exposure at default to determine a quantitative component of the allowance.

Allowance for AFS Securities. AFS securities impairment reviews are conducted quarterly to identify and evaluate securities that have indications of possible credit losses. A determination as to whether a security’s decline in market value is related to credit impairment takes into consideration numerous factors and the relative significance of any single factor can vary by security. Factors Northern Trust considers in determining whether impairment is credit related include, but are not limited to, the severity of the impairment; the cause of the impairment; the financial condition and near-term prospects of the issuer; activity in the market of the issuer, which may indicate adverse credit conditions; Northern Trust’s intent regarding the sale of the security as of the balance sheet date; and the likelihood that Northern Trust will not be required to

sell the security for a period of time sufficient to allow for the recovery of the security’s amortized cost basis. For each security meeting the requirements of Northern Trust’s internal screening process, an extensive review is conducted to determine if a credit loss has occurred that is then based on the best estimate of cash flows to be collected from the security, discounted using the security’s effective interest rate. If the present value of the expected cash flows is found to be less than the current amortized cost of the security, an allowance for credit losses is generally recorded equal to the difference between the two amounts, limited to the amount the amortized cost basis exceeds the fair value of the security.

If management intends to sell, or will more likely than not be required to sell, an AFS security prior to recovery of its amortized cost basis, the security is written down to fair value with unrealized losses recognized in Investment Security Gains (Losses), net on the consolidated statements of income.

Allowance for Other Financial Assets. The allowance for other financial assets covers assets categorized as Due from Banks, Other Central Bank Deposits, Interest-Bearing Deposits with Banks, Federal Funds Sold, and Other Assets. The Other Assets category includes other miscellaneous credit exposures reported in Other Assets on the consolidated balance sheets. The allowance estimation methodology for other financial assets primarily utilizes a similar approach as the one used for the HTM debt securities portfolio. It consists of a combination of externally and internally developed loss data, adjusted for the appropriate contractual term. Northern Trust’s portfolio is composed mostly of institutions within the “1 to 3” internal borrower rating category and is expected to exhibit minimal to modest likelihood of loss.

The portion of the allowance assigned to loans, HTM debt securities, and other financial assets is presented as a contra asset in Allowance for Credit Losses on the consolidated balance sheets. The portion of the allowance assigned to undrawn loan commitments and standby letters of credit is reported in Other Liabilities on the consolidated balance sheets. The allowance for AFS securities is presented parenthetically with the amortized cost basis of AFS securities on the consolidated balance sheets.

Provision for Credit Losses. Provision for Credit Losses on the consolidated statements of income represents the change in the Allowance for Credit Losses on the consolidated balance sheets and is the charge to current period earnings. It represents the amount needed to maintain the Allowance for Credit Losses on the consolidated balance sheets at an appropriate level to absorb lifetime expected credit losses related to financial assets in scope. Actual losses may vary from current estimates and the amount of the Provision for Credit Losses may be either greater than or less than actual net charge-offs.

Contractual Term. Northern Trust estimates expected credit losses over the contractual term of the financial assets adjusted for prepayments, unless prepayments are not relevant to specific portfolios or sub-portfolios. Extension and renewal options are typically not considered since it is not Northern Trust’s practice to enter into arrangements where the borrower has the unconditional option to renew, or a conditional extension option whereby the conditions are beyond Northern Trust’s control.

Accrued Interest. Northern Trust elected not to measure an allowance for credit losses for accrued interest receivables related to its loan and securities portfolios as its policy is to write-off uncollectible accrued interest receivable balances in a timely manner. Accrued interest is written off by reversing interest income during the quarter the financial asset is moved from an accrual to a nonaccrual status.

Standby Letters of Credit

Standby Letters of Credit. Fees on standby letters of credit are recognized in Other Operating Income on the consolidated statements of income using the straight-line method over the lives of the underlying agreements. Northern Trust’s recorded other liability for standby letters of credit, reflecting the obligation it has undertaken, is measured as the amount of unamortized fees on these instruments.

Buildings and Equipment

Buildings and Equipment. Buildings and equipment owned are carried at original cost less accumulated depreciation. The charge for depreciation is computed using the straight-line method based on the following range of lives: buildings – up to 30 years; equipment – 3 to 10 years; and leasehold improvements – the shorter of the lease term or 15 years.

Other Real Estate Owned (OREO)

Other Real Estate Owned (OREO). OREO is comprised of commercial and residential real estate properties acquired in partial or total satisfaction of loans. OREO assets are carried at the lower of cost or fair value less estimated costs to sell and are recorded in Other Assets on the consolidated balance sheets. Fair value is typically based on third-party appraisals. Appraisals of OREO properties are updated on an annual basis and are subject to adjustments to reflect management’s judgment as to the realizable value of the properties. Losses identified during the 90-day period after the acquisition of such properties are charged against the Allowance for Credit Losses assigned to Loans. Subsequent write-downs to the carrying value of these assets that may be required and gains or losses realized from asset sales are recorded within Other Operating Expense on the consolidated statements of income.

Goodwill and Other Intangible Assets

Goodwill and Other Intangible Assets. Goodwill is not subject to amortization. Separately identifiable acquired intangible assets with finite lives are amortized over their estimated useful lives, primarily on a straight-line basis. Purchased software, software licenses, and allowable internal costs, including compensation relating to software developed for internal use, are capitalized. Software is amortized using the straight-line method over the estimated useful lives of the

assets, generally ranging from 3 to 10 years. Fees paid for the use of software services that do not convey a software license are expensed as incurred.

Goodwill and other intangible assets are reviewed for impairment on an annual basis or more frequently if events or changes in circumstances indicate the carrying amounts may not be recoverable.

Trust, Investment and Other Servicing Fees

Trust, Investment and Other Servicing Fees. Trust, Investment and Other Servicing Fees are recorded on an accrual basis, over the period in which the service is provided. Fees are primarily a function of the market value of assets custodied, managed and serviced, transaction volumes, and securities lending volume and spreads, as set forth in the underlying client agreement. This revenue recognition involves the use of estimates and assumptions, including components that are calculated based on estimated asset valuations and transaction volumes.

Client Security Settlement Receivables

Client Security Settlement Receivables. These receivables result from custody client security sales executed under contractual settlement date accounting that have not yet settled as well as custody client withdrawals from short-term investment funds that settle on the following business day. Northern Trust advances cash to the client on the date of either trade execution or client withdrawal and awaits collection from either the settled trade or short-term investment funds.

Income Taxes

Income Taxes. Northern Trust follows an asset and liability approach to account for income taxes. The objective is to recognize the amount of taxes payable or refundable for the current year, and to recognize deferred tax assets and liabilities for future tax consequences of temporary differences between the amounts reported in the financial statements and the tax bases of assets and liabilities. The measurement of tax assets and liabilities is based on enacted tax laws and applicable tax rates.

Tax positions taken or expected to be taken on a tax return are evaluated based on their likelihood of being sustained upon examination by tax authorities. Only tax positions that are considered more-likely-than-not to be sustained are recorded on the consolidated financial statements. A valuation allowance is established for deferred tax assets if it is more-likely-than-not that all or a portion will not be realized. Northern Trust recognizes any interest and penalties related to unrecognized tax benefits in the Provision for Income Taxes on the consolidated statements of income.

Cash Flow Statements

Cash Flow Statements. Cash and cash equivalents in the cash flow statements have been defined as “Cash and Due from Banks” on the consolidated balance sheets.

Pension and Other Postretirement Benefits

Pension and Other Postretirement Benefits. Northern Trust records the funded status of its defined benefit pension and other postretirement plans on the consolidated balance sheets. Overfunded pension and postretirement benefits are reported in Other Assets and underfunded pension and postretirement benefits are reported in Other Liabilities on the consolidated balance sheets. Plan assets and benefit obligations are measured annually at December 31, unless specific circumstances require an interim remeasurement. Plan assets are determined based on fair value generally representing observable market prices. The projected benefit obligations are determined based on the present value of projected benefit distributions at an assumed discount rate. Actuarial gains and losses accumulated in AOCI are amortized as a component of net periodic pension cost if they exceed 10% of the greater of the projected benefit obligation or the market-related value of plan assets as of the beginning of the year. Amortization is recognized on a straight-line basis over the expected average remaining service period of the active employees or over the expected remaining lifetime of plan participants for plans that have been previously frozen.

Share-Based Compensation Plans

Share-Based Compensation Plans. Northern Trust recognizes as expense the grant-date fair value of stock and stock unit awards and other share-based compensation granted to employees as Compensation on the consolidated statements of income. The fair values of stock and stock unit awards, including performance stock unit awards and director awards, are based on the closing price of the Corporation’s stock on the date of grant adjusted for certain awards that do not accrue dividends while vesting.

Compensation expense for share-based award grants with terms that provide for a graded vesting schedule, whereby portions of the award vest in increments over the requisite service period, are recognized on a straight-line basis over the requisite service period for the entire award. Compensation expense for performance stock unit awards are recognized on a straight-line basis over the requisite service period of the award based on expected achievement of the performance condition. Adjustments are made for employees that meet certain eligibility criteria at the grant date or during the requisite service period.

Northern Trust does not include an estimate of future forfeitures in its recognition of share-based compensation expense. Share-based compensation expense is adjusted based on forfeitures as they occur. Dividend equivalents are accrued for performance stock unit awards, most restricted stock unit awards, and director awards not yet vested, and are paid upon vesting. Certain restricted stock units are not entitled to dividend equivalents during the vesting period. Cash flows resulting from the realization of excess tax benefits are classified as operating cash flows on the consolidated statements of cash flows.

Net Income Per Common Share

Net Income Per Common Share. Basic net income per common share is computed by dividing net income/loss applicable to common stock by the weighted average number of common shares outstanding during each period. Diluted net income per common share is computed by dividing net income applicable to common stock and potential common shares by the aggregate of the weighted average number of common shares outstanding during the period and common share equivalents calculated for stock options outstanding using the treasury stock method. In a period of a net loss, diluted net income per common share is calculated in the same manner as basic net income per common share.

Northern Trust calculates net income applicable to common stock using the two-class method, whereby net income is allocated between common stock and participating securities.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

On January 1, 2023, Northern Trust adopted Accounting Standards Update (ASU) No. 2022-01, “Derivatives and Hedging (Topic 815): Fair Value Hedging—Portfolio Layer Method” (ASU 2022-01). The amendments in ASU 2022-01 expand the current last-of-layer hedging model from a single-layer method to allow multiple hedged layers of a single closed portfolio. To reflect that expansion, the last-of-layer method is renamed the portfolio layer method. In addition, ASU 2022-01 (1) expands the scope of the portfolio layer method to include non-prepayable assets, (2) specifies eligible hedging instruments in a single-layer hedge, (3) provides additional guidance on the accounting for and disclosure of hedge basis adjustments under the portfolio layer method and (4) specifies how hedge basis adjustments should be considered when determining credit losses for the assets included in the closed portfolio. Upon adoption of ASU 2022-01, there was no impact to Northern Trust’s consolidated balance sheets or consolidated statements of income.

On January 1, 2023, Northern Trust adopted ASU No. 2022-02, “Financial Instruments—Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures” (ASU 2022-02). The amendments in ASU 2022-02 eliminate the accounting guidance for troubled debt restructurings (TDRs) for creditors that have adopted the current expected credit losses accounting standard while enhancing disclosure requirements for certain loan refinancings and restructurings made to borrowers experiencing financial difficulty. In addition, ASU 2022-02 requires that a public business entity disclose current-period gross charge-offs by year of origination for financing receivables and net investment in leases. Upon adoption of ASU 2022-02, there was no significant impact to Northern Trust’s consolidated balance sheets or consolidated statements of income. Please refer to Note 5, “Loans” for further information.

On January 1, 2023, Northern Trust adopted ASU No. 2022-04, “Liabilities—Supplier Finance Programs (Topic 405-50): Disclosure of Supplier Finance Program Obligations” (ASU 2022-04). The amendments in ASU 2022-04 enhance the transparency about the use of supplier finance programs for investors or other allocators of capital. Specifically, ASU 2022-04 requires that a buyer in a supplier finance program disclose sufficient qualitative and quantitative information about the program to allow a user of financial statements to understand the program’s nature, activity during the period, changes from period to period, and potential magnitude. Upon adoption of ASU 2022-04, there was no impact to Northern Trust’s consolidated balance sheets or consolidated statements of income.

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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2023

Fair Value Disclosures [Abstract]

Valuation Techniques, Significant Unobservable Inputs, and Quantitative Information

The following table presents the fair values of Northern Trust’s Level 3 liabilities as of December 31, 2023 and 2022, as well as the valuation techniques, significant unobservable inputs, and quantitative information used to develop significant unobservable inputs for such liabilities as of such dates.

TABLE 51: LEVEL 3 SIGNIFICANT UNOBSERVABLE INPUTS

	DECEMBER 31, 2023
FINANCIAL INSTRUMENT	FAIR VALUE	VALUATION TECHNIQUE	UNOBSERVABLE INPUTS	INPUT VALUES			WEIGHTED-AVERAGE INPUT VALUES(1)
Swaps Related to Sale of Certain Visa Class B Common Shares	$25.4 million	Discounted Cash Flow	Conversion Rate	1.59x			1.59x
			Visa Class A Appreciation	10.49%			10.49%
			Expected Duration	9	-	27 months	13 months

(1) Weighted average of expected duration based on scenario probability.

	DECEMBER 31, 2022
FINANCIAL INSTRUMENT	FAIR VALUE	VALUATION TECHNIQUE	UNOBSERVABLE INPUTS	INPUT VALUES			WEIGHTED-AVERAGE INPUT VALUES(1)
Swaps Related to Sale of Certain Visa Class B Common Shares	$34.8 million	Discounted Cash Flow	Conversion Rate	1.60x			1.60x
			Visa Class A Appreciation	8.53%			8.53%
			Expected Duration	12	-	33 months	20 months

(1) Weighted average of expected duration based on scenario probability.

The following table presents the fair values of Northern Trust’s Level 3 assets that were measured at fair value on a nonrecurring basis as of December 31, 2023 and 2022, as well as the valuation technique, significant unobservable inputs, and quantitative information used to develop the significant unobservable inputs for such assets as of such dates.

TABLE 54: LEVEL 3 NONRECURRING BASIS SIGNIFICANT UNOBSERVABLE INPUTS

	DECEMBER 31, 2023
FINANCIAL INSTRUMENT	FAIR VALUE(1)	VALUATION  TECHNIQUE	UNOBSERVABLE INPUTS	INPUT VALUES			WEIGHTED-AVERAGE INPUT VALUES
Loans	$43.3 million	Market Approach	Discount factor applied to real estate collateral-dependent loans to reflect realizable value	0.0%	–	20.0%	2.0%

(1) Includes real estate collateral-dependent loans and other collateral-dependent loans.

	DECEMBER 31, 2022
FINANCIAL INSTRUMENT	FAIR VALUE(1)	VALUATION  TECHNIQUE	UNOBSERVABLE INPUTS	INPUT VALUES			WEIGHTED-AVERAGE INPUT VALUES
Loans	$6.6 million	Market Approach	Discount factor applied to real estate collateral-dependent loans to reflect realizable value	15.0%	–	20.0%	17.2%

(1) Includes real estate collateral-dependent loans and other collateral-dependent loans.

Assets and Liabilities Measured at Fair Value on Recurring Basis Segregated by Fair Value Hierarchy Level

The following presents assets and liabilities measured at fair value on a recurring basis as of December 31, 2023 and 2022, segregated by fair value hierarchy level.

TABLE 52: RECURRING BASIS HIERARCHY LEVELING

	DECEMBER 31, 2023
(In Millions)	LEVEL 1		LEVEL 2		LEVEL 3		NETTING		ASSETS/ LIABILITIES AT FAIR VALUE
Debt Securities
Available for Sale
U.S. Government	$	3,622.2	$	—	$	—	$	—	$	3,622.2
Obligations of States and Political Subdivisions	—		295.8		—		—		295.8
Government Sponsored Agency	—		11,553.0		—		—		11,553.0
Non-U.S. Government	—		264.4		—		—		264.4
Corporate Debt	—		279.5		—		—		279.5
Covered Bonds	—		347.1		—		—		347.1
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	—		2,899.9		—		—		2,899.9
Other Asset-Backed	—		2,962.6		—		—		2,962.6
Commercial Mortgage-Backed	—		865.3		—		—		865.3
Total Available for Sale	3,622.2		19,467.6		—		—		23,089.8
Other Assets
Money Market Investment	95.0		—		—		—		95.0
Derivative Assets
Foreign Exchange Contracts	—		3,266.7		—		(2,937.2)		329.5
Interest Rate Contracts	—		301.5		—		(189.5)		112.0
Total Derivative Assets	—		3,568.2		—		(3,126.7)		441.5
Other Liabilities
Derivative Liabilities
Foreign Exchange Contracts	—		3,255.2		—		(2,175.7)		1,079.5
Interest Rate Contracts	—		369.2		—		(6.0)		363.2
Other Financial Derivatives(1)	—		—		25.4		(23.7)		1.7
Total Derivative Liabilities	$	—	$	3,624.4	$	25.4	$	(2,205.4)	$	1,444.4

Note: Northern Trust has elected to net derivative assets and liabilities when legally enforceable master netting arrangements or similar agreements exist between Northern Trust and the counterparty. As of December 31, 2023, derivative assets and liabilities shown above also include reductions of $2,093.8 million and $1,172.5 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties.

(1) This line consists of swaps related to the sale of certain Visa Class B common shares.

	DECEMBER 31, 2022
(In Millions)	LEVEL 1		LEVEL 2		LEVEL 3		NETTING		ASSETS/ LIABILITIES AT FAIR VALUE
Debt Securities
Available for Sale
U.S. Government	$	2,747.4	$	—	$	—	$	—	$	2,747.4
Obligations of States and Political Subdivisions	—		787.6		—		—		787.6
Government Sponsored Agency	—		11,545.2		—		—		11,545.2
Non-U.S. Government	—		360.0		—		—		360.0
Corporate Debt	—		1,747.6		—		—		1,747.6
Covered Bonds	—		388.7		—		—		388.7
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	—		2,479.4		—		—		2,479.4
Other Asset-Backed	—		5,256.2		—		—		5,256.2
Commercial Mortgage Backed	—		1,387.8		—		—		1,387.8
Total Available for Sale	2,747.4		23,952.5		—		—		26,699.9
Trading Account	95.0		0.2		—		—		95.2
Total Available for Sale and Trading Debt Securities	2,842.4		23,952.7		—		—		26,795.1
Other Assets
Derivative Assets
Foreign Exchange Contracts	—		3,510.1		—		(2,666.4)		843.7
Interest Rate Contracts	—		222.0		—		(144.3)		77.7
Other Financial Derivatives(1)	—		0.3		—		—		0.3
Total Derivatives Assets	—		3,732.4		—		(2,810.7)		921.7
Other Liabilities
Derivative Liabilities
Foreign Exchange Contracts	—		3,187.5		—		(1,826.7)		1,360.8
Interest Rate Contracts	—		431.8		—		(5.9)		425.9
Other Financial Derivatives(2)	—		—		34.8		(33.3)		1.5
Total Derivative Liabilities	$	—	$	3,619.3	$	34.8	$	(1,865.9)	$	1,788.2

Note: Northern Trust has elected to net derivative assets and liabilities when legally enforceable master netting arrangements or similar agreements exist between Northern Trust and the counterparty. As of December 31, 2022, derivative assets and liabilities shown above also include reductions of $1,140.2 million and $195.3 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties.

(1) This line consists of total return swap contracts.

(2) This line consists of swaps related to the sale of certain Visa Class B common shares.

Changes in Level 3 Liabilities

The following table presents the changes in Level 3 liabilities for the years ended December 31, 2023 and 2022.

TABLE 53: CHANGES IN LEVEL 3 LIABILITIES

LEVEL 3 LIABILITIES	SWAPS RELATED TO SALE OF CERTAIN VISA CLASS B COMMON SHARES
(In Millions)	2023		2022
Fair Value at January 1	$	34.8	$	37.5
Total (Gains) Losses:
Included in Earnings(1)	18.9		22.6
Purchases, Issues, Sales, and Settlements
Settlements	(28.3)		(25.3)
Fair Value at December 31	$	25.4	$	34.8
Unrealized Losses (Gains) Included in Earnings Related to Financial Instruments Held at December 31(1)	$	15.4	$	16.6

(1) Gains (losses) are recorded in Other Operating Income on the consolidated statements of income.

Book and Fair Values of All Financial Instruments

The following tables presents the book value and estimated fair value, including the fair value hierarchy level, of Northern Trust’s financial instruments that are not measured at fair value on the consolidated balance sheets as of December 31, 2023 and 2022. The following tables exclude those items measured at fair value on a recurring basis.

TABLE 55: FAIR VALUE OF FINANCIAL INSTRUMENTS

	DECEMBER 31, 2023
					ESTIMATED FAIR VALUE
(In Millions)	BOOK VALUE		TOTAL ESTIMATED FAIR VALUE		LEVEL 1		LEVEL 2		LEVEL 3
FINANCIAL ASSETS
Cash and Due from Banks	$	4,791.5	$	4,791.5	$	4,791.5	$	—	$	—
Federal Reserve and Other Central Bank Deposits	34,326.2		34,326.2		—		34,326.2		—
Interest-Bearing Deposits with Banks	1,939.0		1,939.0		—		1,939.0		—
Securities Purchased under Agreements to Resell	784.7		784.7		—		784.7		—
Debt Securities - Held to Maturity	26,221.7		24,473.0		—		24,473.0		—
Loans
Held for Investment	47,438.3		47,598.3		—		—		47,598.3
Other Assets	1,476.6		1,458.0		86.1		1,371.9		—
FINANCIAL LIABILITIES
Deposits	116,164.0		116,207.6		—		116,207.6		—
Federal Funds Purchased	3,045.4		3,045.4		—		3,045.4		—
Securities Sold Under Agreements to Repurchase	784.7		784.7		—		784.7		—
Other Borrowings	6,567.8		6,607.4		—		6,607.4		—
Senior Notes	2,773.2		2,798.1		—		2,798.1		—
Long-Term Debt	4,065.0		4,186.8		—		4,186.8		—
Unfunded Commitments	178.8		178.8		—		178.8		—
Other Liabilities	74.9		74.9		—		—		74.9

	DECEMBER 31, 2022
					ESTIMATED FAIR VALUE
(In Millions)	BOOK VALUE		TOTAL ESTIMATED FAIR VALUE		LEVEL 1		LEVEL 2		LEVEL 3
FINANCIAL ASSETS
Cash and Due from Banks	$	4,654.2	$	4,654.2	$	4,654.2	$	—	$	—
Federal Reserve and Other Central Bank Deposits	40,030.4		40,030.4		—		40,030.4		—
Interest-Bearing Deposits with Banks	1,941.1		1,941.1		—		1,941.1		—
Federal Funds Sold	32.0		32.0		—		32.0		—
Securities Purchased under Agreements to Resell	1,070.3		1,070.3		—		1,070.3		—
Debt Securities - Held to Maturity	25,036.1		22,879.3		50.0		22,829.3		—
Loans
Held for Investment	42,749.0		42,636.5		—		—		42,636.5
Other Assets	1,476.9		1,460.4		94.7		1,365.7		—
FINANCIAL LIABILITIES
Deposits(1)	123,932.1		123,926.9		—		123,926.9		—
Federal Funds Purchased	1,896.9		1,896.9		—		1,896.9		—
Securities Sold Under Agreements to Repurchase	567.2		567.2		—		567.2		—
Other Borrowings	7,592.3		7,592.8		—		7,592.8		—
Senior Notes	2,724.2		2,729.8		—		2,729.8		—
Long-Term Debt	2,066.2		2,110.7		—		2,110.7		—
Unfunded Commitments	218.9		218.9		—		218.9		—
Other Liabilities	73.2		73.2		—		—		73.2

(1) Northern Trust reclassified its leveling interpretation on client deposits, moving Demand, Noninterest-Bearing, Savings, Money Market and Other Interest-Bearing from Level 1 to Level 2 during 2023, and collapsed client deposits into one row.

XML

Securities (Tables)

12 Months Ended

Dec. 31, 2023

Investments, Debt and Equity Securities [Abstract]

Reconciliation of Amortized Cost to Fair Value of Securities Available for Sale

The following tables provide the amortized cost, fair values, and remaining maturities of AFS debt securities.

TABLE 56: RECONCILIATION OF AMORTIZED COST TO FAIR VALUE OF AVAILABLE FOR SALE DEBT SECURITIES

	DECEMBER 31, 2023
(In Millions)	AMORTIZED COST		GROSS UNREALIZED GAINS		GROSS UNREALIZED LOSSES		FAIR VALUE
U.S. Government	$	3,681.5	$	2.2	$	61.5	$	3,622.2
Obligations of States and Political Subdivisions	315.8		—		20.0		295.8
Government Sponsored Agency	11,744.3		9.0		200.3		11,553.0
Non-U.S. Government	284.8		—		20.4		264.4
Corporate Debt	287.5		0.1		8.1		279.5
Covered Bonds	356.8		—		9.7		347.1
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	3,013.8		0.1		114.0		2,899.9
Other Asset-Backed	3,061.0		1.6		100.0		2,962.6
Commercial Mortgage-Backed	913.5		0.2		48.4		865.3
Total	$	23,659.0	$	13.2	$	582.4	$	23,089.8

	DECEMBER 31, 2022
(In Millions)	AMORTIZED COST		GROSS UNREALIZED GAINS		GROSS UNREALIZED LOSSES		FAIR VALUE
U.S. Government	$	2,837.7	$	2.5	$	92.8	$	2,747.4
Obligations of States and Political Subdivisions	817.8		—		30.2		787.6
Government Sponsored Agency	11,892.5		4.3		351.6		11,545.2
Non-U.S. Government	387.6		—		27.6		360.0
Corporate Debt	1,774.3		0.2		26.9		1,747.6
Covered Bonds	403.1		0.3		14.7		388.7
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	2,645.8		0.3		166.7		2,479.4
Other Asset-Backed	5,544.3		—		288.1		5,256.2
Commercial Mortgage-Backed	1,456.9		0.1		69.2		1,387.8
Total	$	27,760.0	$	7.7	$	1,067.8	$	26,699.9

Remaining Maturity of Securities

DECEMBER 31, 2023	ONE YEAR OR LESS				ONE TO FIVE YEARS				FIVE TO TEN YEARS				OVER TEN YEARS				TOTAL
(In Millions)	Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value
U.S. Government	$	198.3	$	197.8	$	3,483.2	$	3,424.4	$	—	$	—	$	—	$	—	$	3,681.5	$	3,622.2
Obligations of States and Political Subdivisions	—		—		113.2		106.8		202.6		189.0		—		—		315.8		295.8
Government Sponsored Agency	2,384.3		2,357.0		5,330.2		5,237.5		3,327.0		3,282.8		702.8		675.7		11,744.3		11,553.0
Non-U.S. Government	67.9		66.1		216.9		198.3		—		—		—		—		284.8		264.4
Corporate Debt	105.2		103.8		182.3		175.7		—		—		—		—		287.5		279.5
Covered Bonds	90.3		89.2		266.5		257.9		—		—		—		—		356.8		347.1
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	280.3		277.8		2,665.8		2,567.1		67.7		55.0		—		—		3,013.8		2,899.9
Other Asset-Backed	218.1		212.8		2,724.2		2,631.1		107.8		107.8		10.9		10.9		3,061.0		2,962.6
Commercial Mortgage-Backed	41.9		39.3		736.0		708.2		135.6		117.8		—		—		913.5		865.3
Total	$	3,386.3	$	3,343.8	$	15,718.3	$	15,307.0	$	3,840.7	$	3,752.4	$	713.7	$	686.6	$	23,659.0	$	23,089.8

Note: Mortgage-backed and asset-backed securities are included in the above table taking into account anticipated future prepayments.

DECEMBER 31, 2023	ONE YEAR OR LESS				ONE TO FIVE YEARS				FIVE TO TEN YEARS				OVER TEN YEARS				TOTAL
(In Millions)	Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value
U.S. Government	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Obligations of States and Political Subdivisions	45.7		45.3		1,100.7		1,076.8		1,126.3		1,090.8		291.2		279.1		2,563.9		2,492.0
Government Sponsored Agency	984.3		885.4		3,381.4		3,037.6		3,248.6		2,905.4		1,741.0		1,516.8		9,355.3		8,345.2
Non-U.S. Government	3,376.0		3,374.3		1,379.3		1,294.7		33.8		29.6		—		—		4,789.1		4,698.6
Corporate Debt	276.8		269.5		353.7		335.2		15.6		13.2		—		—		646.1		617.9
Covered Bonds	345.4		342.1		1,623.1		1,542.5		240.1		216.0		—		—		2,208.6		2,100.6
Certificates of Deposit	585.1		584.4		—		—		—		—		—		—		585.1		584.4
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	1,080.8		1,055.6		4,159.0		3,893.6		5.7		4.6		—		—		5,245.5		4,953.8
Other Asset-Backed	14.7		14.7		102.0		102.1		97.5		97.6		—		—		214.2		214.4
Commercial Mortgage-Backed	—		—		37.6		36.8		—		—		—		—		37.6		36.8
Other	47.8		46.7		319.0		287.9		30.7		23.5		178.8		71.2		576.3		429.3
Total	$	6,756.6	$	6,618.0	$	12,455.8	$	11,607.2	$	4,798.3	$	4,380.7	$	2,211.0	$	1,867.1	$	26,221.7	$	24,473.0

Note: Mortgage-backed and asset-backed securities are included in the above table taking into account anticipated future prepayments.

Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value

The following table provides information regarding AFS debt securities with no credit losses reported that had been in a continuous unrealized loss position for less than twelve months and for twelve months or longer as of December 31, 2023 and 2022.

TABLE 58: AVAILABLE FOR SALE DEBT SECURITIES IN UNREALIZED LOSS POSITION WITH NO CREDIT LOSSES REPORTED

AS OF DECEMBER 31, 2023	LESS THAN 12 MONTHS				12 MONTHS OR LONGER				TOTAL
(In Millions)	FAIR VALUE		UNREALIZED LOSSES		FAIR VALUE		UNREALIZED LOSSES		FAIR VALUE		UNREALIZED LOSSES
U.S. Government	$	—	$	—	$	3,364.7	$	61.5	$	3,364.7	$	61.5
Obligations of States and Political Subdivisions	87.8		5.9		208.0		14.1		295.8		20.0
Government Sponsored Agency	331.0		11.5		9,486.6		188.8		9,817.6		200.3
Non-U.S. Government	—		—		264.5		20.4		264.5		20.4
Corporate Debt	4.4		0.1		143.0		2.1		147.4		2.2
Covered Bonds	—		—		213.2		9.7		213.2		9.7
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	—		—		2,477.0		105.8		2,477.0		105.8
Other Asset-Backed	19.8		2.0		1,998.7		98.0		2,018.5		100.0
Commercial Mortgage-Backed	60.0		4.6		776.6		43.8		836.6		48.4
Total	$	503.0	$	24.1	$	18,932.3	$	544.2	$	19,435.3	$	568.3

Note: Three corporate debt AFS securities with a fair value of $98.4 million and unrealized losses of $5.9 million and one sub-sovereign, supranational and non-U.S. agency bonds AFS security with a fair value of $71.0 million and unrealized loss of $8.2 million have been excluded from the table above as these AFS securities have a $1.2 million allowance for credit losses reported as of December 31, 2023. Refer to the discussion further below and Note 6, “Allowance for Credit Losses” for further information.

AS OF DECEMBER 31, 2022	LESS THAN 12 MONTHS				12 MONTHS OR LONGER				TOTAL
(In Millions)	FAIR VALUE		UNREALIZED LOSSES		FAIR VALUE		UNREALIZED LOSSES		FAIR VALUE		UNREALIZED LOSSES
U.S. Government	$	1,123.6	$	64.1	$	343.1	$	28.7	$	1,466.7	$	92.8
Obligations of States and Political Subdivisions	160.0		16.8		120.6		13.4		280.6		30.2
Government Sponsored Agency	7,631.4		262.1		2,737.7		89.5		10,369.1		351.6
Non-U.S. Government	235.4		17.3		124.6		10.3		360.0		27.6
Corporate Debt	427.3		14.6		130.3		2.8		557.6		17.4
Covered Bonds	238.0		13.5		42.8		1.2		280.8		14.7
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	1,305.4		74.4		807.1		83.2		2,112.5		157.6
Other Asset-Backed	3,873.4		217.5		1,247.6		70.6		5,121.0		288.1
Commercial Mortgage-Backed	670.9		47.4		215.6		21.8		886.5		69.2
Total	$	15,665.4	$	727.7	$	5,769.4	$	321.5	$	21,434.8	$	1,049.2

Note: Three corporate debt AFS securities with a fair value of $93.8 million and unrealized losses of $9.5 million and one sub-sovereign, supranational and non-U.S. agency bonds AFS security with a fair value of $68.3 million and unrealized loss of $9.1 million have been excluded from the table above as these AFS securities have a $1.3 million allowance for credit losses reported as of December 31, 2022. Refer to the discussion further below and Note 6, “Allowance for Credit Losses” for further information.

Reconciliation of Amortized Cost to Fair Values of Securities Held to Maturity

The following tables provide the amortized cost, fair values and remaining maturities of held to maturity (HTM) debt securities.

TABLE 59: RECONCILIATION OF AMORTIZED COST TO FAIR VALUES OF HELD TO MATURITY DEBT SECURITIES

	DECEMBER 31, 2023
(In Millions)	AMORTIZED COST		GROSS UNREALIZED GAINS		GROSS UNREALIZED LOSSES		FAIR VALUE
U.S. Government	$	—	$	—	$	—	$	—
Obligations of States and Political Subdivisions	2,563.9		0.5		72.4		2,492.0
Government Sponsored Agency	9,355.3		2.3		1,012.4		8,345.2
Non-U.S. Government	4,789.1		0.2		90.7		4,698.6
Corporate Debt	646.1		—		28.2		617.9
Covered Bonds	2,208.6		0.3		108.3		2,100.6
Certificates of Deposit	585.1		—		0.7		584.4
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	5,245.5		3.2		294.9		4,953.8
Other Asset-Backed	214.2		0.4		0.2		214.4
Commercial Mortgage-Backed	37.6		—		0.8		36.8
Other	576.3		—		147.0		429.3
Total	$	26,221.7	$	6.9	$	1,755.6	$	24,473.0

	DECEMBER 31, 2022
(In Millions)	AMORTIZED COST		GROSS UNREALIZED GAINS		GROSS UNREALIZED LOSSES		FAIR VALUE
U.S. Government	$	50.0	$	—	$	—	$	50.0
Obligations of States and Political Subdivisions	2,565.3		—		149.8		2,415.5
Government Sponsored Agency	9,407.7		—		1,076.0		8,331.7
Non-U.S. Government	3,234.0		0.1		133.8		3,100.3
Corporate Debt	713.3		—		45.4		667.9
Covered Bonds	2,530.3		0.3		158.7		2,371.9
Certificates of Deposit	35.9		—		—		35.9
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	5,703.3		1.0		436.1		5,268.2
Other Asset-Backed	263.7		—		1.0		262.7
Other	532.6		—		157.4		375.2
Total	$	25,036.1	$	1.4	$	2,158.2	$	22,879.3

Debt Securities, Held-to-maturity, Credit Quality Indicator

The following table provides the amortized cost of HTM debt securities by credit rating.

TABLE 61: AMORTIZED COST OF HELD TO MATURITY DEBT SECURITIES BY CREDIT RATING

	AS OF DECEMBER 31, 2023
($ In Millions)	AAA			AA			A			BBB			NOT RATED			TOTAL
U.S. Government	$	—		$	—		$	—		$	—		$	—		$	—
Obligations of States and Political Subdivisions	954.7			1,609.0			—			—			0.2			2,563.9
Government Sponsored Agency	9,355.3			—			—			—			—			9,355.3
Non-U.S. Government	813.3			1,179.6			2,463.3			332.9			—			4,789.1
Corporate Debt	2.1			302.6			341.4			—			—			646.1
Covered Bonds	2,208.6			—			—			—			—			2,208.6
Certificates of Deposit	545.9			—			—			—			39.2			585.1
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	4,047.9			1,166.5			30.0			1.1			—			5,245.5
Other Asset-Backed	214.2			—			—			—			—			214.2
Commercial Mortgage-Backed	37.6			—			—			—			—			37.6
Other	54.8			—			—			—			521.5			576.3
Total	$	18,234.4		$	4,257.7		$	2,834.7		$	334.0		$	560.9		$	26,221.7
Percent of Total	70		%	16		%	11		%	1		%	2		%	100		%

	AS OF DECEMBER 31, 2022
($ In Millions)	AAA			AA			A			BBB			NOT RATED			TOTAL
U.S. Government	$	50.0		$	—		$	—		$	—		$	—		$	50.0
Obligations of States and Political Subdivisions	926.8			1,638.5			—			—			—			2,565.3
Government Sponsored Agency	9,407.7			—			—			—			—			9,407.7
Non-U.S. Government	762.2			926.5			1,223.0			322.3			—			3,234.0
Corporate Debt	2.1			305.7			405.5			—			—			713.3
Covered Bonds	2,530.3			—			—			—			—			2,530.3
Certificates of Deposit	—			—			—			—			35.9			35.9
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	4,171.3			1,502.0			28.9			1.1			—			5,703.3
Other Asset-Backed	263.7			—			—			—			—			263.7
Other	65.8			—			—			—			466.8			532.6
Total	$	18,179.9		$	4,372.7		$	1,657.4		$	323.4		$	502.7		$	25,036.1
Percent of Total	73		%	17		%	7		%	1		%	2		%	100		%

Schedule of Realized Gain (Loss)

Proceeds of $5.2 billion, $138.7 million and $116.7 million in 2023, 2022 and 2021, respectively, from the sale of debt securities resulted in the following pre-tax Investment Security Gains (Losses), net shown in the following tables.

TABLE 62: INVESTMENT SECURITY GAINS AND LOSSES

	DECEMBER 31,
(In Millions)	2023		2022		2021
Gross Realized Debt Securities Gains	$	10.5	$	—	$	1.4
Gross Realized Debt Securities Losses	(180.0)		(214.0)		(1.7)
Investment Security Gains (Losses), net(1)	$	(169.5)	$	(214.0)	$	(0.3)

(1) $214.0 million of Investment Security Gains (Losses), net includes a $213.0 million loss recognized in 2022 in conjunction with the intent to sell certain AFS debt securities.

TABLE 63: INVESTMENT SECURITY GAINS AND LOSSES BY SECURITY TYPE

	DECEMBER 31,
(In Millions)	2023		2022		2021
U.S. Governments	$	(29.9)	$	—	$	—
Obligations of States and Political Subdivisions	9.8		(95.8)		—
Government Sponsored Agency	(73.2)		—		—
Corporate Debt	(7.6)		(67.3)		(0.3)
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	(9.1)		—		—
Other Asset-Backed	(58.6)		(17.1)		—
Commercial Mortgage-Backed	(0.9)		(33.8)		—
Investment Security Gains (Losses), net(1)	$	(169.5)	$	(214.0)	$	(0.3)

(1) $214.0 million of Investment Security Gains (Losses), net includes a $213.0 million loss recognized in 2022 in conjunction with the intent to sell certain AFS debt securities.

XML

Loans (Tables)

12 Months Ended

Dec. 31, 2023

Receivables [Abstract]

Amounts Outstanding for Loans and Leases by Segment and Class

Amounts outstanding for Loans, by segment and class, are shown in the following table.

TABLE 64: LOANS

	DECEMBER 31,
(In Millions)	2023		2022
Commercial
Commercial and Institutional(1)	$	11,555.3	$	12,415.0
Commercial Real Estate	5,134.2		4,773.0
Non-U.S.(1)	2,778.5		3,131.1
Other	5,944.8		1,316.5
Total Commercial	25,412.8		21,635.6
Personal
Private Client	14,360.0		14,119.0
Residential Real Estate	6,327.1		6,413.5
Non-U.S.	428.8		510.0
Other	1,088.3		215.2
Total Personal	22,204.2		21,257.7
Total Loans	$	47,617.0	$	42,893.3

(1) Commercial and institutional and commercial-non-U.S. combined include $4.5 billion and $5.6 billion of private equity capital call finance loans at December 31, 2023 and 2022, respectively.

Loan and Lease Segment and Class Balances Segregated by Borrower Ratings into "1 to 3", "4 to 5" and "6 to 9" (Watch List) Categories

TABLE 65: CREDIT QUALITY INDICATOR AT AMORTIZED COST BASIS BY ORIGINATION YEAR

DECEMBER 31, 2023	TERM LOANS												REVOLVING LOANS		REVOLVING LOANS CONVERTED TO TERM LOANS
(In Millions)	2023		2022		2021		2020		2019		PRIOR						TOTAL
Commercial
Commercial and Institutional
Risk Rating:
1 to 3 Category	$	443.9	$	534.1	$	668.3	$	78.1	$	137.2	$	409.9	$	4,909.8	$	15.0	$	7,196.3
4 to 5 Category	801.4		790.9		729.5		138.7		120.5		178.7		1,332.4		72.0		4,164.1
6 to 9 Category	13.8		70.0		60.8		12.0		0.1		1.7		34.7		1.8		194.9
Total Commercial and Institutional	1,259.1		1,395.0		1,458.6		228.8		257.8		590.3		6,276.9		88.8		11,555.3
Commercial Real Estate (CRE)
Risk Rating:
1 to 3 Category	403.6		389.9		159.1		23.9		37.8		44.8		51.0		—		1,110.1
4 to 5 Category	1,513.5		1,208.8		521.0		218.4		252.8		96.0		136.3		7.9		3,954.7
6 to 9 Category	16.1		—		30.5		—		8.2		14.6		—		—		69.4
Total CRE	1,933.2		1,598.7		710.6		242.3		298.8		155.4		187.3		7.9		5,134.2
CRE Gross Charge-offs	(0.7)		(4.4)		—		—		—		—		—		—		(5.1)
Non-U.S.
Risk Rating:
1 to 3 Category	487.9		—		43.2		65.2		34.2		3.3		760.0		—		1,393.8
4 to 5 Category	974.7		0.8		—		—		—		150.0		243.4		—		1,368.9
6 to 9 Category	1.5		14.3		—		—		—		—		—		—		15.8
Total Non-U.S.	1,464.1		15.1		43.2		65.2		34.2		153.3		1,003.4		—		2,778.5
Other
Risk Rating:
1 to 3 Category	4,313.2		—		—		—		—		—		—		—		4,313.2
4 to 5 Category	1,631.6		—		—		—		—		—		—		—		1,631.6
Total Other	5,944.8		—		—		—		—		—		—		—		5,944.8
Other Gross Charge-offs	(0.6)		—		—		—		—		—		—		—		(0.6)
Total Commercial	10,601.2		3,008.8		2,212.4		536.3		590.8		899.0		7,467.6		96.7		25,412.8
Commercial Gross Charge-offs	(1.3)		(4.4)		—		—		—		—		—		—		(5.7)
Personal
Private Client
Risk Rating:
1 to 3 Category	504.7		140.8		52.3		67.5		8.7		134.7		5,320.9		168.1		6,397.7
4 to 5 Category	290.1		488.2		655.1		100.9		158.8		44.7		5,721.5		447.8		7,907.1
6 to 9 Category	23.6		0.3		—		—		—		18.3		13.0		—		55.2
Total Private Client	818.4		629.3		707.4		168.4		167.5		197.7		11,055.4		615.9		14,360.0
Residential Real Estate (RRE)
Risk Rating:
1 to 3 Category	278.7		464.0		500.6		373.3		142.4		722.4		219.8		—		2,701.2
4 to 5 Category	191.6		694.9		717.4		686.7		290.0		805.3		170.3		—		3,556.2
6 to 9 Category	—		10.9		—		0.7		1.6		43.6		12.9		—		69.7
Total RRE	470.3		1,169.8		1,218.0		1,060.7		434.0		1,571.3		403.0		—		6,327.1
RRE Gross Charge-offs	(0.8)		—		—		—		—		(1.0)		—		—		(1.8)
Non-U.S.
Risk Rating:
1 to 3 Category	15.5		—		0.6		—		—		4.6		71.4		—		92.1
4 to 5 Category	12.7		16.0		39.2		—		16.4		8.9		236.1		7.4		336.7
Total Non-U.S.	28.2		16.0		39.8		—		16.4		13.5		307.5		7.4		428.8
Other
Risk Rating:
1 to 3 Category	461.7		—		—		—		—		—		—		—		461.7
4 to 5 Category	626.6		—		—		—		—		—		—		—		626.6
Total Other	1,088.3		—		—		—		—		—		—		—		1,088.3
Total Personal	2,405.2		1,815.1		1,965.2		1,229.1		617.9		1,782.5		11,765.9		623.3		22,204.2
Personal Gross Charge-offs	(0.8)		—		—		—		—		(1.0)		—		—		(1.8)
Total Loans	$	13,006.4	$	4,823.9	$	4,177.6	$	1,765.4	$	1,208.7	$	2,681.5	$	19,233.5	$	720.0	$	47,617.0
Total Loans Gross Charge-offs	$	(2.1)	$	(4.4)	$	—	$	—	$	—	$	(1.0)	$	—	$	—	$	(7.5)

December 31, 2022	TERM LOANS												REVOLVING LOANS		REVOLVING LOANS CONVERTED TO TERM LOANS
(In Millions)	2022		2021		2020		2019		2018		PRIOR						TOTAL
Commercial
Commercial and Institutional
Risk Rating:
1 to 3 Category	$	753.3	$	1,087.5	$	209.8	$	159.3	$	45.9	$	511.3	$	6,032.8	$	17.7	$	8,817.6
4 to 5 Category	744.1		740.6		300.8		191.1		151.4		174.7		1,102.3		32.9		3,437.9
6 to 9 Category	50.8		30.5		—		13.7		—		—		64.5		—		159.5
Total Commercial and Institutional	1,548.2		1,858.6		510.6		364.1		197.3		686.0		7,199.6		50.6		12,415.0
CRE
Risk Rating:
1 to 3 Category	318.7		227.4		123.6		123.5		39.8		39.1		113.4		3.0		988.5
4 to 5 Category	968.5		1,040.0		637.8		447.3		153.0		256.9		181.5		17.5		3,702.5
6 to 9 Category	7.7		22.7		—		49.1		—		—		2.5		—		82.0
Total CRE	1,294.9		1,290.1		761.4		619.9		192.8		296.0		297.4		20.5		4,773.0
Non-U.S.
Risk Rating:
1 to 3 Category	991.9		46.2		109.6		14.8		—		6.5		1,158.3		—		2,327.3
4 to 5 Category	459.0		—		—		—		—		214.9		89.5		1.8		765.2
6 to 9 Category	0.1		—		—		23.1		—		—		15.4		—		38.6
Total Non-U.S.	1,451.0		46.2		109.6		37.9		—		221.4		1,263.2		1.8		3,131.1
Other
Risk Rating:
1 to 3 Category	993.9		—		—		—		—		—		—		—		993.9
4 to 5 Category	322.6		—		—		—		—		—		—		—		322.6
Total Other	1,316.5		—		—		—		—		—		—		—		1,316.5
Total Commercial	5,610.6		3,194.9		1,381.6		1,021.9		390.1		1,203.4		8,760.2		72.9		21,635.6
Personal
Private Client
Risk Rating:
1 to 3 Category	395.5		159.9		50.5		313.6		13.4		18.5		5,352.5		28.2		6,332.1
4 to 5 Category	430.3		755.1		192.4		191.3		38.7		160.0		5,728.6		267.2		7,763.6
6 to 9 Category	0.9		—		0.1		—		18.6		—		3.7		—		23.3
Total Private Client	826.7		915.0		243.0		504.9		70.7		178.5		11,084.8		295.4		14,119.0
RRE
Risk Rating:
1 to 3 Category	871.6		666.7		567.7		168.1		102.9		750.8		128.4		7.9		3,264.1
4 to 5 Category	354.3		656.7		597.6		290.0		170.9		838.2		180.4		1.0		3,089.1
6 to 9 Category	—		6.8		1.5		1.1		3.7		35.9		11.3		—		60.3
Total RRE	1,225.9		1,330.2		1,166.8		459.2		277.5		1,624.9		320.1		8.9		6,413.5
Non-U.S.
Risk Rating:
1 to 3 Category	3.0		3.7		—		—		4.6		2.3		124.6		—		138.2
4 to 5 Category	24.2		40.3		—		21.3		3.2		2.9		272.0		7.8		371.7
6 to 9 Category	—		—		—		—		—		0.1		—		—		0.1
Total Non-U.S.	27.2		44.0		—		21.3		7.8		5.3		396.6		7.8		510.0
Other
Risk Rating:
1 to 3 Category	190.8		—		—		—		—		—		—		—		190.8
4 to 5 Category	24.4		—		—		—		—		—		—		—		24.4
Total Other	215.2		—		—		—		—		—		—		—		215.2
Total Personal	2,295.0		2,289.2		1,409.8		985.4		356.0		1,808.7		11,801.5		312.1		21,257.7
Total Loans	$	7,905.6	$	5,484.1	$	2,791.4	$	2,007.3	$	746.1	$	3,012.1	$	20,561.7	$	385.0	$	42,893.3

Past Due Loans by Segment and Class

The following table provides balances and delinquency status of accrual and nonaccrual loans by segment and class, as well as the other real estate owned and nonaccrual asset balances, as of December 31, 2023 and 2022.

TABLE 66: DELINQUENCY STATUS

	ACCRUAL														NONACCRUAL WITH NO ALLOWANCE
(In Millions)	CURRENT		30 – 59 DAYS PAST DUE		60 – 89 DAYS PAST DUE		90 DAYS OR MORE PAST DUE		TOTAL ACCRUAL		NONACCRUAL		TOTAL LOANS
December 31, 2023
Commercial
Commercial and Institutional	$	11,374.6	$	163.7	$	0.7	$	—	$	11,539.0	$	16.3	$	11,555.3	$	4.1
Commercial Real Estate	5,123.7		4.4		6.1		—		5,134.2		—		5,134.2		—
Non-U.S.	2,778.5		—		—		—		2,778.5		—		2,778.5		—
Other	5,944.8		—		—		—		5,944.8		—		5,944.8		—
Total Commercial	25,221.6		168.1		6.8		—		25,396.5		16.3		25,412.8		4.1
Personal
Private Client	14,240.0		63.9		24.8		11.0		14,339.7		20.3		14,360.0		18.3
Residential Real Estate	6,283.0		7.5		0.5		9.1		6,300.1		27.0		6,327.1		27.0
Non-U.S.	428.2		—		0.6		—		428.8		—		428.8		—
Other	1,088.3		—		—		—		1,088.3		—		1,088.3		—
Total Personal	22,039.5		71.4		25.9		20.1		22,156.9		47.3		22,204.2		45.3
Total Loans	$	47,261.1	$	239.5	$	32.7	$	20.1	$	47,553.4	$	63.6	$	47,617.0	$	49.4
					Other Real Estate Owned						$	1.5
					Total Nonaccrual Assets						$	65.1

	ACCRUAL														NONACCRUAL WITH NO ALLOWANCE
(In Millions)	CURRENT		30 – 59 DAYS PAST DUE		60 – 89 DAYS PAST DUE		90 DAYS OR MORE PAST DUE		TOTAL ACCRUAL		NONACCRUAL		TOTAL LOANS
December 31, 2022
Commercial
Commercial and Institutional	$	12,353.7	$	40.2	$	3.0	$	0.7	$	12,397.6	$	17.4	$	12,415.0	$	4.4
Commercial Real Estate	4,761.5		1.3		—		—		4,762.8		10.2		4,773.0		6.2
Non-U.S.	3,131.1		—		—		—		3,131.1		—		3,131.1		—
Other	1,316.5		—		—		—		1,316.5		—		1,316.5		—
Total Commercial	21,562.8		41.5		3.0		0.7		21,608.0		27.6		21,635.6		10.6
Personal
Private Client	13,843.5		192.3		29.9		53.3		14,119.0		—		14,119.0		—
Residential Real Estate	6,373.2		9.6		12.3		0.1		6,395.2		18.3		6,413.5		18.3
Non-U.S	509.9		—		—		0.1		510.0		—		510.0		—
Other	215.2		—		—		—		215.2		—		215.2		—
Total Personal	20,941.8		201.9		42.2		53.5		21,239.4		18.3		21,257.7		18.3
Total Loans	$	42,504.6	$	243.4	$	45.2	$	54.2	$	42,847.4	$	45.9	$	42,893.3	$	28.9
					Other Real Estate Owned						$	—
					Total Nonaccrual Assets						$	45.9

Financing Receivable, Modified

TABLE 67: LOAN MODIFICATIONS MADE TO BORROWERS EXPERIENCING FINANCIAL DIFFICULTY

YEAR ENDED DECEMBER 31, 2023
($ In Millions)	LOAN MODIFICATION DETAIL	AMORTIZED COST BASIS		% OF TOTAL SEGMENT
Commercial(1)
Commercial and Institutional	Term extension	$	16.7	0.14	%
Commercial Real Estate	Principal and/or interest deferral	—		—
Commercial Real Estate	Combination of principal and/or interest deferral and term extension	—		—
Total Commercial		$	16.7	0.07	%
Personal(1)
Private Client	Term extension	$	—	—	%
Private Client	Principal and/or interest deferral	18.3		0.13
Residential Real Estate	Principal and/or interest deferral	1.0		0.02
Residential Real Estate	Interest rate concession	—		—
Residential Real Estate	Combination of principal and/or interest deferral and term extension	4.7		0.07
Total Personal		$	24.0	0.11	%
Total Loans		$	40.7	0.09	%

(1) Included are financially distressed modifications for which the respective loans had no amortized cost basis as of December 31, 2023 due to pay-downs or charge-offs.

The following table describes the financial effect of the modifications made to borrowers experiencing financial difficulty.

TABLE 68: FINANCIAL EFFECT OF MODIFICATIONS MADE TO BORROWERS EXPERIENCING FINANCIAL DIFFICULTY

	FINANCIAL EFFECT
PRINCIPAL AND INTEREST DEFERRAL
Commercial
Commercial Real Estate	Northern Trust provided a weighted average of 6 months payment deferrals to borrowers for total deferred principal and interest of $32.5 million.
Personal
Residential Real Estate	Northern Trust provided a weighted average of 14 months payment deferrals to borrowers for immaterial principal and interest deferral amounts.
Private Client	Northern Trust provided payment deferrals to borrowers until collateral sale is executed for total principal and interest of $18.9 million.
TERM EXTENSION
Commercial
Commercial and Institutional	Northern Trust provided weighted average term extension of 12 months.
Commercial Real Estate	Northern Trust provided weighted average term extension of 6 months.
Personal
Residential Real Estate	Northern Trust provided weighted average term extension of 9 months.
Private Client	Northern Trust provided weighted average term extension of 60 months.
INTEREST RATE CONCESSION
Personal
Residential Real Estate	Northern Trust provided a 2% reduction in the weighted average contractual interest rates.

Number of Loans and Leases Modified in TDRs and Total Recorded Investments and Unpaid Principal Balances

The following table provides, by segment and class, the number of TDR modifications of loans entered into during the year ended December 31, 2022, and the recorded investments and unpaid principal balances as of December 31, 2022.

TABLE 69: TROUBLED DEBT RESTRUCTURINGS

($ In Millions)	LOAN MODIFICATION DETAIL	NUMBER OF LOANS	RECORDED INVESTMENT		UNPAID PRINCIPAL BALANCE
December 31, 2022
Commercial
Commercial and Institutional	Interest rate concession, extension of term, and other modification	2	$	0.6	$	0.6
Commercial Real Estate	Interest rate concession and other modification	1	31.6		32.5
Total Commercial		3	32.2		33.1
Personal
Residential Real Estate	Interest rate concession, deferrals of principal, extension of term, and other modification	3	0.2		0.2
Private Client	Interest rate concession and extension of term	1	0.4		0.4
Total Personal		4	0.6		0.6
Total Loans		7	$	32.8	$	33.7

Note: Period-end balances reflect all paydowns and charge-offs during the year.

XML

Allowance for Credit Losses (Tables)

12 Months Ended

Dec. 31, 2023

Receivables [Abstract]

Allowances for Credit Losses and Recorded Investments in Loans and Leases by Segment

The following table provides information regarding changes in the total allowance for credit losses.

TABLE 70: CHANGES IN THE ALLOWANCE FOR CREDIT LOSSES

	2023
(In Millions)	LOANS		UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT		HELD TO MATURITY DEBT SECURITIES		OTHER FINANCIAL ASSETS		TOTAL
Balance at Beginning of Period	$	144.3	$	38.5	$	16.0	$	0.8	$	199.6
Charge-Offs	(7.5)		—		(1.2)		—		(8.7)
Recoveries	3.7		—		—		—		3.7
Net Recoveries (Charge-Offs)	(3.8)		—		(1.2)		—		(5.0)
Provision for (Release of) Credit Losses(1)	38.2		(11.6)		(2.1)		0.1		24.6
Balance at End of Period	$	178.7	$	26.9	$	12.7	$	0.9	$	219.2

(1) The table excludes a release of credit reserves of $0.1 million for the year ended December 31, 2023 for AFS debt securities. See further detail in Note 4, “Securities.”

	2022
(In Millions)	LOANS		UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT		HELD TO MATURITY DEBT SECURITIES		OTHER FINANCIAL ASSETS		TOTAL
Balance at Beginning of Period	$	138.4	$	34.1	$	11.2	$	1.0	$	184.7
Charge-Offs	(6.0)		—		—		—		(6.0)
Recoveries	10.2		—		—		—		10.2
Net Recoveries (Charge-Offs)	4.2		—		—		—		4.2
Provision for (Release of) Credit Losses(1)	1.7		4.4		4.8		(0.2)		10.7
Balance at End of Period	$	144.3	$	38.5	$	16.0	$	0.8	$	199.6

(1) The table excludes a provision for credit losses of $1.3 million for the year ended December 31, 2022 for AFS debt securities. See further detail in Note 4, “Securities.”

	2021
(In Millions)	LOANS AND LEASES		UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT		HELD TO MATURITY DEBT SECURITIES		OTHER FINANCIAL ASSETS		TOTAL
Balance at Beginning of Period	190.7		61.1		7.3		0.8		259.9
Charge-Offs	(0.7)		—		—		—		(0.7)
Recoveries	7.0		—		—		—		7.0
Net Recoveries (Charge-Offs)	6.3		—		—		—		6.3
Provision for (Release of) Credit Losses	(58.6)		(27.0)		3.9		0.2		(81.5)
Balance at End of Period	$	138.4	$	34.1	$	11.2	$	1.0	$	184.7

The following table provides information regarding changes in the total allowance for credit losses related to loans, including undrawn loan commitments and standby letters of credit, by segment.

TABLE 71: CHANGES IN THE ALLOWANCE FOR CREDIT LOSSES RELATED TO LOANS

	2023
	LOANS						UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
(In Millions)	COMMERCIAL		PERSONAL		TOTAL		COMMERCIAL		PERSONAL		TOTAL
Balance at Beginning of Period	$	116.2	$	28.1	$	144.3	$	36.3	$	2.2	$	38.5
Charge-Offs	(5.7)		(1.8)		(7.5)		—		—		—
Recoveries	0.2		3.5		3.7		—		—		—
Net Recoveries (Charge-Offs)	(5.5)		1.7		(3.8)		—		—		—
Provision for (Release of) Credit Losses	36.1		2.1		38.2		(11.4)		(0.2)		(11.6)
Balance at End of Period	$	146.8	$	31.9	$	178.7	$	24.9	$	2.0	$	26.9

	2022
	LOANS						UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
(In Millions)	COMMERCIAL		PERSONAL		TOTAL		COMMERCIAL		PERSONAL		TOTAL
Balance at Beginning of Period	$	105.6	$	32.8	$	138.4	$	31.4	$	2.7	$	34.1
Charge-Offs	(5.3)		(0.7)		(6.0)		—		—		—
Recoveries	2.7		7.5		10.2		—		—		—
Net Recoveries (Charge-Offs)	(2.6)		6.8		4.2		—		—		—
Provision for (Release of) Credit Losses	13.2		(11.5)		1.7		4.9		(0.5)		4.4
Balance at End of Period	$	116.2	$	28.1	$	144.3	$	36.3	$	2.2	$	38.5

	2021
	LOANS AND LEASES						UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
(In Millions)	COMMERCIAL		PERSONAL		TOTAL		COMMERCIAL		PERSONAL		TOTAL
Balance at Beginning of Period	$	142.2	$	48.5	$	190.7	$	57.6	$	3.5	$	61.1
Charge-Offs	(0.3)		(0.4)		(0.7)		—		—		—
Recoveries	0.9		6.1		7.0		—		—		—
Net Recoveries (Charge-Offs)	0.6		5.7		6.3		—		—		—
Provision for (Release of) Credit Losses	(37.2)		(21.4)		(58.6)		(26.2)		(0.8)		(27.0)
Balance at End of Period	$	105.6	$	32.8	$	138.4	$	31.4	$	2.7	$	34.1

The following table provides information regarding the recorded investments in loans and the allowance for credit losses for loans and undrawn loan commitments and standby letters of credit by segment as of December 31, 2023 and 2022.

TABLE 72: RECORDED INVESTMENTS IN LOANS

	DECEMBER 31, 2023						DECEMBER 31, 2022
(In Millions)	COMMERCIAL		PERSONAL		TOTAL		COMMERCIAL		PERSONAL		TOTAL
Loans
Evaluated on an Individual Basis	$	33.7	$	62.6	$	96.3	$	63.0	$	46.1	$	109.1
Evaluated on a Collective Basis	25,379.1		22,141.6		47,520.7		21,572.6		21,211.6		42,784.2
Total Loans	25,412.8		22,204.2		47,617.0		21,635.6		21,257.7		42,893.3
Allowance for Credit Losses on Loans
Evaluated on an Individual Basis	11.4		2.0		13.4		10.4		—		10.4
Evaluated on a Collective Basis	135.4		29.9		165.3		105.8		28.1		133.9
Allowance Assigned to Loans	146.8		31.9		178.7		116.2		28.1		144.3
Allowance for Undrawn Loan Commitments and Standby Letters of Credit
Evaluated on an Individual Basis	—		—		—		—		—		—
Evaluated on a Collective Basis	24.9		2.0		26.9		36.3		2.2		38.5
Allowance Assigned to Undrawn Loan Commitments and Standby Letters of Credit	24.9		2.0		26.9		36.3		2.2		38.5
Total Allowance Assigned to Loans and Undrawn Loan Commitments and Standby Letters of Credit	$	171.7	$	33.9	$	205.6	$	152.5	$	30.3	$	182.8

Debt Securities, Held-to-maturity, Allowance for Credit Loss

The following table provides information regarding changes in the total allowance for credit losses for HTM debt securities.

TABLE 73: CHANGES IN THE ALLOWANCE FOR CREDIT LOSSES RELATED TO HELD TO MATURITY DEBT SECURITIES

	2023
(In Millions)	CORPORATE DEBT		NON-U.S. GOVERNMENT		SUB-SOVEREIGN, SUPRANATIONAL, AND NON-U.S. AGENCY BONDS		OBLIGATIONS OF STATES AND POLITICAL SUBDIVISIONS(1)		COVERED BONDS		OTHER		TOTAL
Balance at Beginning of Period	$	1.9	$	3.6	$	4.0	$	1.5	$	0.1	$	4.9	$	16.0
Charge-Offs	—		—		—		—		—		(1.2)		(1.2)
Recoveries	—		—		—		—		—		—		—
Net Recoveries (Charge-Offs)	—		—		—		—		—		(1.2)		(1.2)
Provision for (Release of) Credit Losses	(1.0)		(0.1)		(1.8)		(0.3)		—		1.1		(2.1)
Balance at End of Period	$	0.9	$	3.5	$	2.2	$	1.2	$	0.1	$	4.8	$	12.7

(1) The allowance for Obligations of States and Political Subdivisions is related to (non pre-refunded) municipal securities that do not fall under Northern Trust’s zero-loss assumption.

	2022
(In Millions)	CORPORATE DEBT		NON-U.S. GOVERNMENT		SUB-SOVEREIGN, SUPRANATIONAL, AND NON-U.S. AGENCY BONDS		OBLIGATIONS OF STATES AND POLITICAL SUBDIVISIONS(1)		COVERED BONDS		OTHER		TOTAL
Balance at Beginning of Period	$	1.4	$	1.9	$	3.0	$	—	$	0.1	$	4.8	$	11.2
Provision for Credit Losses	0.5		1.7		1.0		1.5		—		0.1		4.8
Balance at End of Period	$	1.9	$	3.6	$	4.0	$	1.5	$	0.1	$	4.9	$	16.0

(1) The allowance for Obligations of States and Political Subdivisions is related to (non pre-refunded) municipal securities that do not fall under Northern Trust’s zero-loss assumption.

	2021
(In Millions)	CORPORATE DEBT		NON-U.S. GOVERNMENT		SUB-SOVEREIGN, SUPRANATIONAL, AND NON-U.S. AGENCY BONDS		OBLIGATIONS OF STATES AND POLITICAL SUBDIVISIONS		COVERED BONDS		OTHER		TOTAL
Balance at Beginning of Period	$	0.8	$	0.2	$	1.2	$	—	$	0.1	$	5.0	$	7.3
Provision for Credit Losses	0.6		1.7		1.8		—		—		(0.2)		3.9
Balance at End of Period	$	1.4	$	1.9	$	3.0	$	—	$	0.1	$	4.8	$	11.2

Schedule of Accrued Interest

The following table provides the amount of accrued interest excluded from the amortized cost basis of the following portfolios.

TABLE 74: ACCRUED INTEREST

(In Millions)	DECEMBER 31, 2023		DECEMBER 31, 2022
Loans	$	241.7	$	203.1
Debt Securities
Held to Maturity	72.0		63.2
Available for Sale	129.2		147.1
Other Financial Assets	86.0		43.8
Total	$	528.9	$	457.2

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Concentrations of Credit Risk (Tables)

12 Months Ended

Dec. 31, 2023

Risks and Uncertainties [Abstract]

Schedules of Concentration of Risk, by Risk Factor

The table below provides additional detail regarding residential real estate loans by geographic region.

TABLE 75: RESIDENTIAL REAL ESTATE LOANS BY GEOGRAPHIC REGION

	DECEMBER 31,
(In Millions)	2023		2022
Residential Real Estate by geographic region:
Florida	$	1,648.1	$	1,603.2
California	1,463.8		1,508.1
Illinois	640.3		686.9
New York	505.4		498.7
Colorado	344.1		364.2
Texas	318.7		312.4
All other(1)	1,406.7		1,440.0
Total Residential Real Estate	$	6,327.1	$	6,413.5

(1) The remainder is distributed throughout the other geographic regions within the U.S. served by Northern Trust.

Commercial Real Estate Loan Types

The table below provides additional detail regarding commercial real estate loan types.

TABLE 76: COMMERCIAL REAL ESTATE LOANS

	DECEMBER 31,
(In Millions)	2023		2022
Commercial Mortgages
Office	$	1,035.1	$	1,054.0
Apartment/ Multi-family	1,633.9		1,392.7
Retail	620.9		572.2
Industrial/ Warehouse	687.1		596.2
Other	575.3		548.0
Total Commercial Mortgages	4,552.3		4,163.1
Construction, Acquisition and Development Loans	581.9		609.9
Total Commercial Real Estate Loans	$	5,134.2	$	4,773.0

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Buildings and Equipment (Tables)

12 Months Ended

Dec. 31, 2023

Property, Plant and Equipment [Abstract]

Summary of Buildings and Equipment

A summary of Buildings and Equipment is presented in the following table.

TABLE 77: BUILDINGS AND EQUIPMENT

	DECEMBER 31, 2023
(In Millions)	ORIGINAL COST		ACCUMULATED DEPRECIATION		NET BOOK VALUE
Land and Improvements	$	11.5	$	0.3	$	11.2
Buildings	253.1		141.4		111.7
Equipment	536.5		337.5		199.0
Leasehold Improvements	530.0		349.7		180.3
Total Buildings and Equipment	$	1,331.1	$	828.9	$	502.2

	DECEMBER 31, 2022
(In Millions)	ORIGINAL COST		ACCUMULATED DEPRECIATION		NET BOOK VALUE
Land and Improvements	$	11.5	$	0.3	$	11.2
Buildings	224.7		137.7		87.0
Equipment	499.7		281.9		217.8
Leasehold Improvements	514.1		329.6		184.5
Total Buildings and Equipment	$	1,250.0	$	749.5	$	500.5

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Lease Commitments (Tables)

12 Months Ended

Dec. 31, 2023

Leases [Abstract]

Lease Cost Components

The components of lease costs for the years ended December 31, 2023 and 2022 were as follows.

TABLE 78: LEASE COST COMPONENTS

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022
Operating Lease Cost	$	109.2	$	104.5
Variable Lease Cost (1)	54.7		82.2
Sublease Income	(2.7)		(2.9)
Total Lease Cost	$	161.2	$	183.8

(1) Variable Lease Cost includes rental payments based on usage, common-area maintenance costs and property taxes.

The following table provides supplemental cash flow information related to leases for the years ended December 31, 2023 and 2022.

TABLE 82: SUPPLEMENTAL CASH FLOW INFORMATION

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022
Supplemental cash flow information
Cash paid for amounts included in the measurement of lease liabilities - operating cash flows	$	91.4	$	70.3
Supplemental non-cash information
Right-of-use assets obtained in exchange for new operating lease liabilities	$	122.6	$	61.0

Maturity of Lease Liability

The following table presents a maturity analysis of lease liabilities as of December 31, 2023.

TABLE 79: MATURITY OF LEASE LIABILITIES

(In Millions)	MATURITY OF LEASE LIABILITIES
2024	$	93.2
2025	100.3
2026	85.5
2027	84.9
2028	72.8
Later Years	393.5
Total Lease Payments	830.2
Less: Imputed Interest	(137.4)
Present Value of Lease Liabilities	$	692.8

Leases

The location and amount of ROU assets and lease liabilities recorded on the consolidated balance sheets as of December 31, 2023 and 2022 are presented in the following table.

TABLE 80: LOCATION AND AMOUNT OF LEASE ASSETS AND LIABILITIES

(In Millions)	LOCATION OF LEASE ASSETS AND LEASE LIABILITIES ON THE BALANCE SHEET	DECEMBER 31, 2023		DECEMBER 31, 2022
Assets
Operating Lease Right-of-Use Asset	Other Assets	$	522.8	$	484.8
Liabilities
Operating Lease Liability	Other Liabilities	$	692.8	$	626.2

The weighted-average remaining lease term and weighted-average discount rate applied to leases as of December 31, 2023 and 2022 were as follows:

TABLE 81: WEIGHTED-AVERAGE REMAINING LEASE TERM AND DISCOUNT RATE

	DECEMBER 31, 2023		DECEMBER 31, 2022
Operating Leases
Weighted-Average Remaining Lease Term	10.1 years		9.3 years
Weighted-Average Discount Rate	3.3	%	3.0	%

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Goodwill and Other Intangibles (Tables)

12 Months Ended

Dec. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Changes by Reporting Segment in Carrying Amounts of Goodwill, including Effect of Foreign Exchange Rates on Non-U.S.-Dollar-Denominated Balances

Changes by reporting segment in the carrying amount of Goodwill for the years ended December 31, 2023 and 2022, including the effect of foreign exchange rates on non-U.S.-dollar denominated balances, were as follows.

TABLE 83: GOODWILL

(In Millions)	ASSET SERVICING		WEALTH MANAGEMENT		TOTAL
Balance at December 31, 2021	$	625.7	$	80.5	$	706.2
Foreign Exchange Rates	(14.7)		(0.2)		(14.9)
Balance at December 31, 2022	$	611.0	$	80.3	$	691.3
Foreign Exchange Rates	10.9		0.1		11.0
Balance at December 31, 2023	$	621.9	$	80.4	$	702.3

Other Intangible Assets Subject to Amortization

The gross carrying amount and accumulated amortization of other intangible assets subject to amortization as of December 31, 2023 and 2022 were as follows.

TABLE 84: OTHER INTANGIBLE ASSETS

	DECEMBER 31,
(In Millions)	2023		2022
Gross Carrying Amount	$	135.0	$	197.9
Less: Accumulated Amortization	63.4		120.3
Net Book Value	$	71.6	$	77.6

The gross carrying amount and accumulated amortization of capitalized software as of December 31, 2023 and 2022 were as follows.

TABLE 85: CAPITALIZED SOFTWARE

	DECEMBER 31,
(In Millions)	2023		2022
Gross Carrying Amount	$	3,781.7	$	3,479.3
Less: Accumulated Amortization	1,754.2		1,517.4
Net Book Value	$	2,027.5	$	1,961.9

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Deposits (Tables)

12 Months Ended

Dec. 31, 2023

Banking And Thrift, Time Deposits [Abstract]

Time Deposit Maturities

The following table provides the scheduled maturity of total time deposits in denominations of $250,000 or greater at December 31, 2023.

TABLE 86: REMAINING MATURITY OF TIME DEPOSITS $250,000 OR MORE

	DECEMBER 31, 2023
	U.S. OFFICE		NON-U.S. OFFICES
(In Millions)	CERTIFICATES OF DEPOSIT		OTHER TIME		TOTAL
1 Year or Less	$	3,394.0	$	2,580.1	$	5,974.1
Over 1 Year to 2 Years	39.3		—		39.3
Over 2 Years to 3 Years	6.7		—		6.7
Over 3 Years to 4 Years	2.1		—		2.1
Over 4 Years to 5 Years	9.9		—		9.9
Over 5 Years	—		—		—
Total	$	3,452.0	$	2,580.1	$	6,032.1

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Senior Notes and Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2023

Debt Disclosure [Abstract]

Summary of Senior Notes Outstanding

A summary of Senior Notes outstanding at December 31, 2023 and 2022 is presented in the following table.

TABLE 87: SENIOR NOTES

	DECEMBER 31,
($ In Millions)	RATE		2023		2022
Corporation-Senior Notes
Fixed Rate Due May 2027(1)	4.00	%	$	997.6	$	995.0
Fixed Rate Due Aug. 2028(2)(3)	3.65		483.3		476.6
Fixed Rate Due May 2029(2)(3)	3.15		469.1		460.3
Fixed Rate Due May 2030(2)(3)	1.95		823.2		792.3
Total Senior Notes			$	2,773.2	$	2,724.2

(1) Redeemable within one month of maturity.

(2) Redeemable within three months of maturity.

(3) Interest rate swap contracts were entered into to modify the interest expense from fixed rates to floating rates. The swaps are recorded as fair value hedges and (decreases) increases in the carrying values of senior notes outstanding of $(219.1) million and $(264.7) million were recorded as of December 31, 2023 and 2022, respectively. See further detail in Note 25, “Derivative Financial Instruments.”

Summary of Long-Term Debt Outstanding

A summary of Long-Term Debt, defined as debt with original maturities of one year or more, outstanding at December 31, 2023 and 2022 is presented in the following table. We do not reclassify long-term debt to short-term borrowings within a year of maturity.

TABLE 88: LONG-TERM DEBT

			DECEMBER 31,
($ In Millions)	RATE		2023		2022
Corporation-Subordinated Debt
Fixed Rate Notes due October 2025(1)(2)	3.950	%	$	720.3	$	720.1
Fixed-to-Floating Rate Notes due May 2032(3)	3.375		349.7		349.7
Fixed Rate Notes due November 2032(4)	6.125		995.0		996.4
Total Corporation-Subordinated Debt			$	2,065.0	$	2,066.2
Federal Home Loan Bank (FHLB) Advances
FHLB Fixed Rate Advance due December 2025	5.13	%	$	30.0	$	—
FHLB Fixed Rate Advance due December 2025	5.18		570.0		—
FHLB Fixed Rate Advance due March 2026	5.13		600.0		—
FHLB Fixed Rate Advance due June 2026	5.09		800.0		—
Total FHLB Advances			$	2,000.0	$	—
Total Long-Term Debt			$	4,065.0	$	2,066.2
Long-Term Debt Qualifying as Risk-Based Capital			$	1,490.8	$	1,648.5

(1) Not redeemable prior to maturity.

(2) Interest rate swap contracts were entered into to modify the interest expense from fixed rates to floating rates. The swaps are recorded as fair value hedges and (decreases) increases in the carrying values of the subordinated notes outstanding of $(29.3) million were recorded as of December 31, 2022. See further detail in Note 25, “Derivative Financial Instruments.” There were no swaps as of December 31, 2023 as the fair value hedge was discontinued.

(3) The subordinated notes will bear interest from the date they were issued to, but excluding, May 8, 2027, at an annual rate of 3.375%, payable semi-annually in arrears. Effective February 27, 2023, the Board of Governors of the Federal Reserve adopted a final rule to implement the Adjustable Interest Rate (LIBOR) Act (the “LIBOR Act”). The final rule establishes benchmark replacements for contracts governed by U.S. law that reference certain tenors of U.S. dollar LIBOR after June 30, 2023. Pursuant to the final rule, three-month LIBOR will be replaced by the three-month CME Term SOFR Reference Rate, as administered by CME Group Benchmark Administration, Ltd. (“three-month CME Term SOFR”) plus the statutory spread adjustment of 0.26161% as set forth in the final rule. As a result, from, and including, May 8, 2027, the subordinated notes will bear interest at an annual rate equal to three-month CME Term SOFR plus 0.26161% plus 1.131%, payable quarterly in arrears. The subordinated notes are unsecured and may be redeemed, in whole but not in part, on, and only on, May 8, 2027, at a redemption price equal to 100% of the principal amount of the subordinated notes to be redeemed, plus accrued and unpaid interest, if any, up to but excluding the redemption date.

(4) Redeemable within three months of maturity.

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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2023

Equity [Abstract]

Analysis of Changes in Number of Shares of Common Stock Outstanding

An analysis of changes in the number of shares of common stock outstanding follows:

TABLE 89: SHARES OF COMMON STOCK

	2023	2022	2021
Balance at January 1	208,428,309	207,761,875	208,289,178
Incentive Plan and Awards	1,040,450	914,404	1,162,484
Stock Options Exercised	42,143	63,566	837,757
Treasury Stock Purchased	(4,384,678)	(311,536)	(2,527,544)
Balance at December 31	205,126,224	208,428,309	207,761,875

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Accumulated Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2023

Equity [Abstract]

Components of Accumulated Other Comprehensive Income (Loss)

The following tables summarize the components of Accumulated Other Comprehensive Income (Loss) (AOCI) at December 31, 2023, 2022, and 2021, and changes during the years then ended.

TABLE 90: SUMMARY OF CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

(In Millions)	NET UNREALIZED GAINS (LOSSES) ON AVAILABLE FOR SALE DEBT SECURITIES(1)		NET UNREALIZED (LOSSES) GAINS ON CASH FLOW HEDGES		NET FOREIGN CURRENCY ADJUSTMENT		NET PENSION AND OTHER POSTRETIREMENT BENEFIT ADJUSTMENTS		TOTAL
Balance at December 31, 2020	$	641.8	$	(3.2)	$	144.7	$	(355.3)	$	428.0
Net Change	(534.7)		0.8		10.5		59.8		(463.6)
Balance at December 31, 2021	$	107.1	$	(2.4)	$	155.2	$	(295.5)	$	(35.6)
Net Change	(1,474.7)		3.6		9.4		(71.9)		(1,533.6)
Balance at December 31, 2022	$	(1,367.6)	$	1.2	$	164.6	$	(367.4)	$	(1,569.2)
Net Change	443.7		(0.4)		39.0		(51.0)		431.3
Balance at December 31, 2023	$	(923.9)	$	0.8	$	203.6	$	(418.4)	$	(1,137.9)

(1) Includes net unrealized gains (losses) on debt securities transferred from AFS to HTM. Refer to Note 4, “Securities” for further information.

Components of Changes in Accumulated Other Comprehensive Income (Loss)

FOR THE YEAR ENDED DECEMBER 31,	2023						2022						2021
(In Millions)	PRE-TAX		TAX		AFTER TAX		PRE-TAX		TAX		AFTER TAX		PRE-TAX		TAX		AFTER TAX
Unrealized Gains (Losses) on Available for Sale Debt Securities
Unrealized Gains (Losses) on Available for Sale Debt Securities	$	319.4	$	(81.1)	$	238.3	$	(2,263.8)	$	580.2	$	(1,683.6)	$	(685.0)	$	177.5	$	(507.5)
Reclassification Adjustments for Losses (Gains) Included in Net Income:
Interest Income on Debt Securities(1)	105.6		(26.7)		78.9		65.1		(16.4)		48.7		(36.6)		9.2		(27.4)
Net Losses on Debt Securities(2)	169.5		(43.0)		126.5		214.0		(53.8)		160.2		0.3		(0.1)		0.2
Net Change	$	594.5	$	(150.8)	$	443.7	$	(1,984.7)	$	510.0	$	(1,474.7)	$	(721.3)	$	186.6	$	(534.7)
Unrealized (Losses) Gains on Cash Flow Hedges
Foreign Exchange Contracts	$	36.3	$	(9.2)	$	27.1	$	1.0	$	(0.3)	$	0.7	$	5.6	$	(1.4)	$	4.2
Reclassification Adjustment for (Gains) Losses Included in Net Income(3)	(36.8)		9.3		(27.5)		3.7		(0.8)		2.9		(4.5)		1.1		(3.4)
Net Change	$	(0.5)	$	0.1	$	(0.4)	$	4.7	$	(1.1)	$	3.6	$	1.1	$	(0.3)	$	0.8
Foreign Currency Adjustments
Foreign Currency Translation Adjustments	$	100.8	$	(1.6)	$	99.2	$	(200.1)	$	3.0	$	(197.1)	$	(133.8)	$	4.1	$	(129.7)
Long-Term Intra-Entity Foreign Currency Transaction (Losses) Gains	(0.9)		0.2		(0.7)		(2.6)		0.7		(1.9)		0.6		(0.1)		0.5
Net Investment Hedge Gains (Losses)	(77.4)		17.9		(59.5)		278.7		(70.3)		208.4		186.6		(46.9)		139.7
Net Change	$	22.5	$	16.5	$	39.0	$	76.0	$	(66.6)	$	9.4	$	53.4	$	(42.9)	$	10.5
Pension and Other Postretirement Benefit Adjustments
Net Actuarial (Losses) Gains	$	(71.4)	$	15.7	$	(55.7)	$	(163.9)	$	44.7	$	(119.2)	$	7.9	$	0.2	$	8.1
Reclassification Adjustment for Losses (Gains) Included in Net Income(4)
Amortization of Net Actuarial Loss	6.4		(1.7)		4.7		19.1		(4.7)		14.4		41.4		(10.3)		31.1
Amortization of Prior Service Cost (Credit)	—		—		—		(1.0)		0.3		(0.7)		(1.0)		0.3		(0.7)
Settlement Loss	—		—		—		44.9		(11.3)		33.6		28.3		(7.0)		21.3
Net Change	$	(65.0)	$	14.0	$	(51.0)	$	(100.9)	$	29.0	$	(71.9)	$	76.6	$	(16.8)	$	59.8
Total Net Change	$	551.5	$	(120.2)	$	431.3	$	(2,004.9)	$	471.3	$	(1,533.6)	$	(590.2)	$	126.6	$	(463.6)

(1) The before-tax reclassification adjustment is related to the unrealized gains (losses) amortization on AFS debt securities that were transferred to HTM debt securities during the second quarter of 2021 and third quarter of 2022. Refer to Note 4, “Securities” for further information.

(2) The net losses on AFS debt securities before-tax reclassification adjustment is recorded in Investment Security Gains (Losses), net on the consolidated statements of income. Refer to Note 4, “Securities” for further information.

(3) See Note 25, "Derivative Financial Instruments" for the location of the reclassification adjustment related to cash flow hedges.

(4) The pension and other postretirement benefit before-tax reclassification adjustment is recorded in Employee Benefits expense on the consolidated statements of income.

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Net Income per Common Share (Tables)

12 Months Ended

Dec. 31, 2023

Earnings Per Share [Abstract]

Computations of Net Income per Common Share

The computations of net income per common share are presented in the following table.

TABLE 92: NET INCOME PER COMMON SHARE

	FOR THE YEAR ENDED DECEMBER 31,
($ In Millions Except Per Common Share Information)	2023		2022		2021
BASIC NET INCOME PER COMMON SHARE
Average Number of Common Shares Outstanding	207,248,094		208,309,331		208,075,522
Net Income	$	1,107.3	$	1,336.0	$	1,545.3
Less: Dividends on Preferred Stock	41.8		41.8		41.8
Net Income Applicable to Common Stock	1,065.5		1,294.2		1,503.5
Less: Earnings Allocated to Participating Securities	11.6		11.8		12.9
Earnings Allocated to Common Shares Outstanding	$	1,053.9	$	1,282.4	$	1,490.6
Basic Net Income Per Common Share	5.09		6.16		7.16
DILUTED NET INCOME PER COMMON SHARE
Average Number of Common Shares Outstanding	207,248,094		208,309,331		208,075,522
Plus Dilutive Effect of Share-based Compensation	315,652		557,933		823,708
Average Common and Potential Common Shares	207,563,746		208,867,264		208,899,230
Earnings Allocated to Common and Potential Common Shares	$	1,053.9	$	1,282.4	$	1,490.6
Diluted Net Income Per Common Share	5.08		6.14		7.14

Note: Common stock equivalents of 0.1 million for the year ended December 31, 2023, were not included in the computation of diluted net income per common share because their inclusion would have been antidilutive. For the years ended December 31, 2022 and 2021, respectively, there were de minimis and no common stock equivalents excluded in the computation of diluted net income per share.

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Revenue from Contracts with Clients Revenue from Contracts with Clients (Tables)

12 Months Ended

Dec. 31, 2023

Revenue from Contract with Customer [Abstract]

Revenue Disaggregation

The following table presents revenues disaggregated by major revenue source.

TABLE 93: REVENUE DISAGGREGATION

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Noninterest Income
Trust, Investment and Other Servicing Fees
Custody and Fund Administration	$	1,805.3	$	1,816.0	$	1,917.5
Investment Management and Advisory	2,232.3		2,299.1		2,140.0
Securities Lending	83.9		81.6		76.9
Other	240.3		235.9		226.7
Total Trust, Investment and Other Servicing Fees	$	4,361.8	$	4,432.6	$	4,361.1
Other Noninterest Income
Foreign Exchange Trading Income	$	203.9	$	288.6	$	292.6
Treasury Management Fees	31.6		39.3		44.3
Security Commissions and Trading Income	135.0		136.2		140.2
Other Operating Income	228.7		191.3		243.9
Investment Security Gains (Losses), net	(169.5)		(214.0)		(0.3)
Total Other Noninterest Income	$	429.7	$	441.4	$	720.7
Total Noninterest Income	$	4,791.5	$	4,874.0	$	5,081.8

Client Receivables

The following table represents receivables balances from contracts with clients, which are included in Other Assets on the consolidated balance sheets, at December 31, 2023 and 2022.

TABLE 94: CLIENT RECEIVABLES

	DECEMBER 31,
(In Millions)	2023		2022
Trust Fees Receivable, net(1)	$	863.5	$	882.5
Other	64.9		55.4
Total Client Receivables	$	928.4	$	937.9

(1)Trust Fees Receivable is net of a $15.9 million and $13.5 million fee receivable allowance as of December 31, 2023 and 2022, respectively.

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Net Interest Income (Tables)

12 Months Ended

Dec. 31, 2023

Banking and Thrift, Interest [Abstract]

Components of Net Interest Income

The components of Net Interest Income were as follows.

TABLE 95: NET INTEREST INCOME

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Interest Income
Federal Reserve and Other Central Bank Deposits	$	1,462.3	$	472.0	$	11.3
Interest-Bearing Due from and Deposits with Banks(1)	130.1		46.6		9.1
Federal Funds Sold	0.3		0.1		—
Securities Purchased under Agreements to Resell	1,585.2		103.7		3.5
Securities – Taxable	1,534.4		899.9		658.8
– Nontaxable(2)	1.3		1.3		1.5
Loans and Leases	2,551.1		1,344.3		713.5
Other Interest-Earning Assets(3)	60.3		9.8		8.8
Total Interest Income	$	7,325.0	$	2,877.7	$	1,406.5
Interest Expense
Deposits	$	2,685.3	$	602.8	$	(61.3)
Federal Funds Purchased	256.9		34.1		(0.4)
Securities Sold under Agreements to Repurchase	1,541.1		90.7		0.2
Other Borrowings	542.5		126.2		14.2
Senior Notes	170.0		92.7		48.3
Long-Term Debt	147.2		44.0		21.1
Floating Rate Capital Debt	—		—		1.7
Total Interest Expense	$	5,343.0	$	990.5	$	23.8
Net Interest Income	$	1,982.0	$	1,887.2	$	1,382.7

(1) Interest-Bearing Due from and Deposits with Banks includes the interest-bearing component of Cash and Due from Banks and Interest-Bearing Deposits with Banks as presented on the consolidated balance sheets.

(2) Non-taxable Securities represent securities that are exempt from U.S. federal income taxes.

(3) Other Interest-Earning Assets include certain community development investments, collateral deposits with certain securities depositories and clearing houses, Federal Home Loan Bank and Federal Reserve stock, and money market investments which are classified in Other Assets on the consolidated balance sheets.

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Other Operating Income (Tables)

12 Months Ended

Dec. 31, 2023

Other Income and Expenses [Abstract]

Components of Other Operating Income

The components of Other Operating Income were as follows.

TABLE 96: OTHER OPERATING INCOME

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Loan Service Fees	$	83.1	$	71.5	$	66.6
Banking Service Fees	53.0		49.8		50.9
Bank Owned Life Insurance	69.5		61.0		48.5
Other Income(1)	23.1		9.0		77.9
Total Other Operating Income	$	228.7	$	191.3	$	243.9

(1) Other Income includes the mark-to-market gain or loss on derivative swap activity primarily related to the sale of certain Visa Class B common shares.

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Other Operating Expense (Tables)

12 Months Ended

Dec. 31, 2023

Other Income and Expenses [Abstract]

Summary of other operating expenses

The components of Other Operating Expense were as follows.

TABLE 97: OTHER OPERATING EXPENSE

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Business Promotion	$	74.8	$	76.7	$	65.5
Staff Related	35.0		34.6		33.9
FDIC Insurance Premiums(1)	112.0		17.8		14.6
Charitable Contributions	15.6		19.4		18.0
Other Expenses	235.5		210.8		167.1
Total Other Operating Expense	$	472.9	$	359.3	$	299.1

(1) FDIC Insurance Premiums include the $84.6 million FDIC special assessment for the year ended December 31, 2023. This line also reflects an initial base deposit insurance assessment rate increase which began in the first quarterly assessment period of 2023.

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2023

Income Tax Disclosure [Abstract]

Reconciliation of Total Provision for Income Taxes with Amounts Computed at Federal Tax Rate of 35%

The following table reconciles the statutory federal tax rate with the effective tax rate for the periods presented below.

TABLE 98: INCOME TAXES

	FOR THE YEAR ENDED DECEMBER 31,
	2023		2022		2021
Statutory Federal Tax Rate	21.0	%	21.0	%	21.0	%
State Taxes, net	3.4		3.3		3.4
Foreign Tax Rate Differential	0.6		0.1		0.1
Excess Tax Benefit Related to Share-Based Compensation	(0.1)		(0.2)		(0.4)
Tax Credits	(2.7)		(2.0)		(1.6)
Tax Exempt Income	(1.4)		(0.9)		(0.6)
Valuation Allowance	1.8		1.5		0.6
Other, net	1.8		1.6		0.6
Effective Tax Rate	24.4	%	24.4	%	23.1	%

Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows.

TABLE 99: UNRECOGNIZED TAX BENEFITS

(In Millions)	2023		2022		2021
Balance at January 1	$	40.7	$	25.3	$	22.4
Additions for Tax Positions Taken in the Current Year	2.1		1.7		1.2
Additions for Tax Positions Taken in Prior Years	24.0		13.7		4.2
Reductions for Tax Positions Taken in Prior Years	(5.1)		—		(2.5)
Reductions Resulting from Expiration of Statutes	(1.0)		—		—
Balance at December 31	$	60.7	$	40.7	$	25.3

Components of Consolidated Provision for Income Taxes

The components of the consolidated Provision for Income Taxes for each of the three years ended December 31 are as follows.

TABLE 100: PROVISION FOR INCOME TAXES

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Current Tax Provision:
Federal	$	250.5	$	357.7	$	241.5
State	63.2		84.7		74.0
Non-U.S.	92.0		130.6		147.3
Total	$	405.7	$	573.0	$	462.8
Deferred Tax Provision:
Federal	$	(54.0)	$	(126.0)	$	(11.7)
State	(1.4)		(10.7)		12.0
Non-U.S.	7.2		(6.0)		1.7
Total	$	(48.2)	$	(142.7)	$	2.0
Provision for Income Taxes	$	357.5	$	430.3	$	464.8

Tax Charges (Benefits) Recorded Directly to Stockholders' Equity

In addition to the amounts shown above, tax charges (benefits) have been recorded directly to Stockholders’ Equity for the following. For further detail, refer to Note 14, “Accumulated Other Comprehensive Income (Loss).”

TABLE 101: TAX CHARGES (BENEFITS) RECORDED DIRECTLY TO STOCKHOLDERS’ EQUITY

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Tax Effect of Other Comprehensive Income	$	120.2	$	(471.3)	$	(126.6)

Deferred Tax Liabilities and Assets

Deferred tax assets and liabilities have been computed as follows.

TABLE 102: DEFERRED TAX ASSETS AND LIABILITIES

	DECEMBER 31,
(In Millions)	2023		2022
Deferred Tax Liabilities:
Software Development	394.9		354.7
Depreciation and Amortization	23.9		122.6
Compensation and Benefits	—		5.2
State Taxes, net	46.8		58.3
Other Liabilities	53.4		42.1
Gross Deferred Tax Liabilities	519.0		582.9
Deferred Tax Assets:
Allowance for Credit Losses	46.2		41.8
Unrealized Losses on Securities, net	244.6		427.3
Compensation and Benefits	70.2		—
Tax Credit and Loss Carryforwards	121.2		95.3
Other Assets	116.0		143.7
Gross Deferred Tax Assets	598.2		708.1
Valuation Reserve	(121.2)		(95.3)
Deferred Tax Assets, net of Valuation Reserve	477.0		612.8
Net Deferred Tax Assets (Liabilities)	$	(42.0)	$	29.9

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Employee Benefits (Tables)

12 Months Ended

Dec. 31, 2023

Retirement Benefits [Abstract]

Plan Status of U.S. Plan, Non-U.S. Plans and Supplemental Plan

The following tables set forth the status, amounts included in AOCI, and net periodic pension expense of the U.S. Qualified Plan, Non-U.S. Pension Plans, and U.S. Non-Qualified Plan. Prior service credits for the U.S. Qualified Plan were amortized on a straight-line basis over 11 years and were amortized in full as of December 31, 2022. Prior service

costs for the U.S. Non-Qualified Plan were amortized on a straight-line basis over 10 years and were amortized in full as of December 31, 2021.

TABLE 103: EMPLOYEE BENEFIT PLAN STATUS

	U.S. QUALIFIED PLAN						NON-U.S. PENSION PLANS						U.S. NON-QUALIFIED PLAN
($ In Millions)	2023			2022			2023			2022			2023			2022
Accumulated Benefit Obligation	$	1,015.6		$	963.3		$	143.7		$	126.2		$	94.1		$	97.4
Projected Benefit Obligation	$	1,151.7		$	1,077.7		$	148.6		$	129.0		$	109.2		$	113.6
Plan Assets at Fair Value	1,200.8			1,176.8			148.7			134.5			—			—
Funded Status at December 31	$	49.1		$	99.1		$	0.1		$	5.5		$	(109.2)		$	(113.6)
Weighted-Average Assumptions:
Discount Rates	5.03		%	5.22		%	3.12		%	3.76		%	4.95		%	5.15		%
Rate of Increase in Compensation Level	5.56			5.56			1.75			1.75			5.56			5.56
Expected Long-Term Rate of Return on Assets	7.25			7.25			3.90			3.99			N/A			N/A

Amount Included in Accumulated Other Comprehensive Income

	U.S. QUALIFIED PLAN				NON-U.S. PENSION PLANS				U.S. NON-QUALIFIED PLAN
(In Millions)	2023		2022		2023		2022		2023		2022
Net Actuarial Loss	$	467.7	$	418.3	$	34.4	$	24.3	$	62.3	$	59.2
Prior Service (Credit) Cost	—		—		—		0.2		—		—
Gross Amount in Accumulated Other Comprehensive Income	467.7		418.3		34.4		24.5		62.3		59.2
Income Tax Effect	117.7		105.1		5.1		4.9		15.6		14.8
Net Amount in Accumulated Other Comprehensive Income	$	350.0	$	313.2	$	29.3	$	19.6	$	46.7	$	44.4

Components of Company's Net Periodic Benefit Cost

	U.S. QUALIFIED PLAN(1)													NON-U.S. PENSION PLANS									U.S. NON-QUALIFIED PLAN
($ In Millions)	2023			2022					2021					2023			2022			2021			2023			2022			2021
Service Cost	$	46.0		$	48.0				$	52.3				$	1.6		$	1.7		$	2.2		$	4.8		$	5.6		$	5.3
Interest Cost	53.9			46.3					40.4					4.8			2.5			2.2			5.3			3.9			3.7
Expected Return on Plan Assets	(100.9)			(85.7)					(79.0)					(6.7)			(3.2)			(3.2)			—			—			—
Amortization:
Net Actuarial Loss	1.5			11.4					32.4					(0.4)			0.6			1.0			5.3			7.4			8.2
Prior Service (Credit) Cost	—			(0.1)					(0.4)					—			—			0.2			—			—			0.1
Net Periodic Pension Expense	$	0.5		$	19.9				$	45.7				$	(0.7)		$	1.6		$	2.4		$	15.4		$	16.9		$	17.3
Settlement Expense	—			44.1					27.9					—			0.8			0.4			—			—			—
Total Pension Expense	$	0.5		$	64.0				$	73.6				$	(0.7)		$	2.4		$	2.8		$	15.4		$	16.9		$	17.3
Weighted-Average Assumptions:
Discount Rates	5.22		%	3.03		%	4.81	%	2.75		%	3.05	%	3.76		%	1.34		%	0.93		%	5.15		%	2.80		%	2.45		%
				5.49		%	5.22	%	3.06		%	3.03	%
Rate of Increase in Compensation Level	5.56			4.97								4.97		1.75			1.50			1.50			5.56			4.97			4.97
Expected Long-Term Rate of Return on Assets	7.25			5.25			6.00		5.25			5.00		3.99			1.79			1.28			N/A			N/A			N/A
							6.50

(1) In determining the pension expense for the U.S. Qualified Plan for 2022, Northern Trust utilized a discount rate of 3.03% as of December 31, 2021, 4.81% as of June 30, 2022, 5.49% as of September 30, 2022, and 5.22% as of December 31, 2022 and the expected long-term rate of return was 5.25% as of December 31, 2021, 6.00% as of June 30, 2022, and 6.50% as of September 30, 2022.

In determining the pension expense for the U.S. Qualified Plan for 2021, Northern Trust utilized a discount rate of 2.75% as of December 31, 2020, 3.05% as of June 30, 2021, 3.06% as of September 30, 2021, and 3.03% as of December 31, 2021 and the expected long-term rate of return was 5.25% as of both December 31, 2020 and June 30, 2021, and 5.00% as of September 31, 2021.

Change in Benefit Obligation, Postretirement Health Care, and in Accumulated Postretirement Benefit Obligation

	U.S. QUALIFIED PLAN				NON-U.S. PENSION PLANS				U.S. NON-QUALIFIED PLAN
(In Millions)	2023		2022		2023		2022		2023		2022
Beginning Balance	$	1,077.7	$	1,401.3	$	129.0	$	210.1	$	113.6	$	147.7
Service Cost	46.0		48.0		1.6		1.7		4.8		5.6
Interest Cost	53.9		46.3		4.8		2.5		5.3		3.9
Employee Contributions	—		—		0.8		0.7		—		—
Plan Amendment	—		—		(0.2)		(0.3)		—		—
Actuarial Loss (Gain)	36.8		(281.2)		8.1		(64.3)		8.4		(20.0)
Settlements	—		(125.0)		—		(0.9)		—		—
Benefits Paid	(62.7)		(11.7)		(4.1)		(4.6)		(22.9)		(23.6)
Foreign Exchange Rate Changes	—		—		8.6		(15.9)		—		—
Ending Balance	$	1,151.7	$	1,077.7	$	148.6	$	129.0	$	109.2	$	113.6

Estimated Future Benefit Payments

(In Millions)	U.S. QUALIFIED PLAN		NON-U.S.PENSION PLANS		U.S. NON-QUALIFIED PLAN
2024	$	95.7	$	6.2	$	15.8
2025	99.6		4.7		16.1
2026	98.9		5.5		13.4
2027	101.2		6.5		11.2
2028	98.6		6.8		11.2
2029-2033	487.6		35.3		49.8

Change in Plan Assets

	U.S. QUALIFIED PLAN				NON-U.S PENSION PLANS
(In Millions)	2023		2022		2023		2022
Fair Value of Assets at Beginning of Period	$	1,176.8	$	1,708.9	$	134.5	$	198.7
Actual Return on Assets	86.8		(395.4)		5.0		(46.9)
Employer Contributions	—		—		3.9		3.6
Employee Contributions	—		—		0.8		0.7
Settlements	—		(125.0)		—		(0.9)
Benefits Paid	(62.8)		(11.7)		(4.1)		(4.6)
Foreign Exchange Rate Changes	—		—		8.6		(16.1)
Fair Value of Assets at End of Period	$	1,200.8	$	1,176.8	$	148.7	$	134.5

Fair Values of U.S. Pension Plan Assets by Major Asset Category, and their Level within Fair Value Hierarchy

The following table presents the fair values of Northern Trust’s U.S. Qualified Plan assets, by major asset category, and their level within the fair value hierarchy defined by GAAP as of December 31, 2023 and 2022.

TABLE 109: FAIR VALUE OF U.S. QUALIFIED PLAN ASSETS

	DECEMBER 31, 2023
(In Millions)	LEVEL 1		LEVEL 2		LEVEL 3		TOTAL
Domestic Common Stock	$	16.6	$	—	$	—	$	16.6
Foreign Common Stock	0.3		—		—		0.3
Domestic Corporate Bonds	—		218.2		—		218.2
Foreign Corporate Bonds	—		33.6		—		33.6
U.S. Government Obligations	—		87.5		—		87.5
Non-U.S. Government Obligations	—		14.0		—		14.0
Domestic Municipal and Provincial Bonds	—		17.2		—		17.2
Foreign Municipal and Provincial Bonds	—		0.3		—		0.3
Collective Trust Funds	—		571.5		—		571.5
Mutual Funds	80.3		—		—		80.3
Cash and Other(1)	(3.4)		—		—		(3.4)
Total Assets at Fair Value in the Fair Value Hierarchy	$	93.8	$	942.3	$	—	$	1,036.1
Assets Valued at NAV per share
Northern Trust Private Equity Funds							45.6
Northern Trust Hedge Fund							36.2
Real Estate Funds							82.9
Total Assets at Fair Value							$	1,200.8

(1) Negative balance in Cash and Other as of December 31, 2023 primarily relates to the timing of transfers between cash accounts and short-term investment funds presented in Collective Trust Funds.

	DECEMBER 31, 2022
(In Millions)	LEVEL 1		LEVEL 2		LEVEL 3		TOTAL
Domestic Common Stock	$	14.7	$	—	$	—	$	14.7
Foreign Common Stock	0.5		—		—		0.5
Domestic Corporate Bonds	—		263.6		—		263.6
Foreign Corporate Bonds	—		39.6		—		39.6
U.S. Government Obligations	—		77.5		—		77.5
Non-U.S. Government Obligations	—		13.8		—		13.8
Domestic Municipal and Provincial Bonds	—		16.8		—		16.8
Foreign Municipal and Provincial Bonds	—		0.2		—		0.2
Collective Trust Funds	—		522.3		—		522.3
Mutual Funds	61.4		—		—		61.4
Cash and Other(1)	(1.1)		—		—		(1.1)
Total Assets at Fair Value in the Fair Value Hierarchy	$	75.5	$	933.8	$	—	$	1,009.3
Assets Valued at NAV per share
Northern Trust Private Equity Funds							33.2
Northern Trust Hedge Fund							35.2
Real Estate Funds							99.1
Total Assets at Fair Value							$	1,176.8

(1) Negative balance in Cash and Other as of December 31, 2022 primarily relates to due to broker for securities purchased.

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Share-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2023

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Compensation Expense for Share-Based Payment Arrangements and Associated Tax Impacts

Total compensation expense for share-based payment arrangements to employees and the associated tax impacts were as follows for the periods presented.

TABLE 110: TOTAL COMPENSATION EXPENSE FOR SHARE-BASED PAYMENT ARRANGEMENTS TO EMPLOYEES

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Restricted Stock Unit Awards	$	95.7	$	96.4	$	78.2
Performance Stock Units	22.5		28.8		17.3
Total Share-Based Compensation Expense	$	118.2	$	125.2	$	95.5
Tax Benefits Recognized	$	29.9	$	31.4	$	24.0

Information Pertaining to Stock Options Granted, Vested and Exercised

The following table provides information about stock options granted, vested, and exercised in the years ended December 31, 2023, 2022, and 2021.

TABLE 111: STOCK OPTIONS GRANTED, VESTED, AND EXERCISED

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Grant-Date Fair Value of Stock Options Vested	$	—	$	—	$	2.2
Stock Options Exercised
Intrinsic Value as of Exercise Date	1.6		3.6		41.3
Cash Received	2.3		3.9		53.8
Tax Deduction Benefits Realized	1.6		3.5		41.3

Summary of Status of Stock Options

A summary of the status of stock options at December 31, 2023, and changes during the year then ended, are presented in the following table.

TABLE 112: STATUS OF STOCK OPTIONS AND CHANGES

($ In Millions Except Per Share Information)	SHARES	WEIGHTED AVERAGE EXERCISE PRICE PER SHARE		WEIGHTED AVERAGE REMAINING CONTRACTUAL TERM (YEARS)	AGGREGATE INTRINSIC VALUE
Options Outstanding, December 31, 2022	441,547	$	72.58
Granted	—	—
Exercised	(42,143)	54.87
Forfeited, Expired or Cancelled	—	—
Options Outstanding, December 31, 2023	399,404	$	74.45	1.9	$	4.7
Options Exercisable, December 31, 2023	399,404	$	74.45	1.9	$	4.7

Restricted Stock Unit Awards

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Status of Outstanding Restricted Stock Unit Awards

A summary of the status of outstanding restricted stock unit awards at December 31, 2023, and changes during the year then ended, is presented in the following table.

TABLE 113: OUTSTANDING RESTRICTED STOCK UNIT AWARDS

($ In Millions)	NUMBER	AGGREGATE INTRINSIC VALUE
Restricted Stock Unit Awards Outstanding, December 31, 2022	2,243,183	$	198.5
Granted	1,166,376
Distributed	(847,281)
Forfeited or Cancelled	(62,220)
Restricted Stock Unit Awards Outstanding, December 31, 2023	2,500,058	$	211.0
Units Convertible, December 31, 2023	18,887	$	1.6

Changes in Nonvested Restricted Stock Unit Awards

The following is a summary of nonvested restricted stock unit awards at December 31, 2023, and changes during the year then ended.

TABLE 114: NONVESTED RESTRICTED STOCK UNIT AWARDS

NONVESTED RESTRICTED STOCK UNITS	NUMBER	WEIGHTED AVERAGE GRANT- DATE FAIR VALUE PER UNIT		WEIGHTED AVERAGE REMAINING VESTING TERM (YEARS)
Nonvested at December 31, 2022	2,223,657	$	103.41	2.4
Granted	1,166,376	91.56
Vested	(846,642)	101.38
Forfeited or Cancelled	(62,220)	99.66
Nonvested at December 31, 2023	2,481,171	$	98.62	2.4

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Commitments and Contingent Liabilities (Tables)

12 Months Ended

Dec. 31, 2023

Commitments and Contingencies Disclosure [Abstract]

Schedule of Summary of Off-Balance Sheet Financial Instruments

The following table provides details of Northern Trust's off-balance sheet financial instruments as of December 31, 2023 and 2022.

TABLE 115: SUMMARY OF OFF-BALANCE SHEET FINANCIAL INSTRUMENTS

	DECEMBER 31,
	2023						2022
(In Millions)	ONE YEAR AND LESS		OVER ONE YEAR		TOTAL		ONE YEAR AND LESS		OVER ONE YEAR		TOTAL
Undrawn Commitments(1)	$	11,849.5	$	18,909.6	$	30,759.1	$	13,639.2	$	17,321.4	$	30,960.6
Standby Letters of Credit and Financial Guarantees(2)(3)	85,752.0		639.0		86,391.0		17,553.0		409.9		17,962.9
Commercial Letters of Credit	29.2		1.3		30.5		25.4		1.3		26.7
Securities Lent with Indemnification	140,539.1		—		140,539.1		130,311.0		—		130,311.0
Unsettled Reverse Repurchase Agreements	27,667.7		—		27,667.7		496.8		—		496.8
Total Off-Balance Sheet Financial Instruments	$	265,837.5	$	19,549.9	$	285,387.4	$	162,025.4	$	17,732.6	$	179,758.0

(1) These amounts exclude $222.2 million and $266.6 million of commitments participated to others at December 31, 2023 and 2022, respectively.

(2) These amounts include $39.1 million and $35.1 million of standby letters of credit secured by cash deposits or participated to others as of December 31, 2023 and 2022, respectively.

(3) This amount includes a $84.6 billion guarantee to the Fixed Income Clearing Corporation (FICC) under the sponsored member program, without taking into consideration the related collateral, as of December 31, 2023. As of December 31, 2022, there was a $16.3 billion guarantee to the FICC; Northern Trust became a sponsored member during the third quarter of 2021.

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Derivative Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Notional and Fair Value Amounts of Client-related and Trading Derivative Financial Instruments

The following table shows the notional and fair values of all derivative financial instruments as of December 31, 2023

and 2022.

TABLE 116: NOTIONAL AND FAIR VALUES OF DERIVATIVE FINANCIAL INSTRUMENTS

	DECEMBER 31, 2023						DECEMBER 31, 2022
			FAIR VALUE						FAIR VALUE
(In Millions)	NOTIONAL VALUE		ASSET(1)		LIABILITY(2)		NOTIONAL VALUE		ASSET(1)		LIABILITY(2)
Derivatives Designated as Hedging under GAAP
Interest Rate Contracts
Fair Value Hedges	$	7,042.7	$	94.7	$	71.0	$	4,622.0	$	58.5	$	32.7
Foreign Exchange Contracts
Cash Flow Hedges	1,453.6		15.0		42.2		150.9		7.4		5.7
Net Investment Hedges	4,077.4		13.3		31.9		3,765.0		283.5		12.7
Total Derivatives Designated as Hedging under GAAP	$	12,573.7	$	123.0	$	145.1	$	8,537.9	$	349.4	$	51.1
Derivatives Not Designated as Hedging under GAAP
Non-Designated Risk Management Derivatives
Foreign Exchange Contracts	$	20.7	$	—	$	0.1	$	55.9	$	0.1	$	0.1
Other Financial Derivatives(3)	867.9		—		25.4		717.7		0.3		34.8
Total Non-Designated Risk Management Derivatives	$	888.6	$	—	$	25.5	$	773.6	$	0.4	$	34.9
Client-Related and Trading Derivatives
Foreign Exchange Contracts	$	313,336.9	$	3,238.4	$	3,181.0	$	288,994.6	$	3,219.1	$	3,169.0
Interest Rate Contracts	13,584.1		206.8		298.2		12,378.2		163.5		399.1
Total Client-Related and Trading Derivatives	$	326,921.0	$	3,445.2	$	3,479.2	$	301,372.8	$	3,382.6	$	3,568.1
Total Derivatives Not Designated as Hedging under GAAP	$	327,809.6	$	3,445.2	$	3,504.7	$	302,146.4	$	3,383.0	$	3,603.0
Total Gross Derivatives	$	340,383.3	$	3,568.2	$	3,649.8	$	310,684.3	$	3,732.4	$	3,654.1
Less: Netting(4)			3,126.7		2,205.4				2,810.7		1,865.9
Total Derivative Financial Instruments			$	441.5	$	1,444.4			$	921.7	$	1,788.2

(1) Derivative assets are reported in Other Assets on the consolidated balance sheets.

(2) Derivative liabilities are reported in Other Liabilities on the consolidated balance sheets.

(3) This line includes swaps related to sales of certain Visa Class B common shares and total return swap contracts.

(4) See further detail in Note 27, "Offsetting of Assets and Liabilities."

Gains/Losses of Derivative Financial Instruments

The following table provides fair value and cash flow hedge derivative gains and losses recognized in income during the years ended December 31, 2023, 2022 and 2021.

TABLE 117: LOCATION AND AMOUNT OF FAIR VALUE AND CASH FLOW HEDGE DERIVATIVE GAINS AND LOSSES RECORDED IN INCOME

(In Millions)	INTEREST INCOME						INTEREST EXPENSE						OTHER OPERATING INCOME
For the Year Ended December 31,	2023		2022		2021		2023		2022		2021		2023		2022		2021
Total amounts on the consolidated statements of income	$	7,325.0	$	2,877.7	$	1,406.5	$	5,343.0	$	990.5	$	23.8	$	228.7	$	191.3	$	243.9
Gains (Losses) on fair value hedges recognized on
Interest Rate Contracts
Recognized on derivatives	(132.6)		82.8		39.1		74.9		(373.4)		(161.6)		—		—		—
Recognized on hedged items	132.6		(82.8)		(39.1)		(74.9)		373.4		161.6		—		—		—
Amounts related to interest settlements on derivatives	47.1		(4.4)		(16.2)		(86.5)		24.1		57.1		—		—		—
Total gains (losses) recognized on fair value hedges	$	47.1	$	(4.4)	$	(16.2)	$	(86.5)	$	24.1	$	57.1	$	—	$	—	$	—
Gains (Losses) on cash flow hedges recognized on
Foreign Exchange Contracts
Net gains (losses) reclassified from AOCI to net income	$	34.9	$	0.6	$	10.5	$	—	$	—	$	—	$	1.9	$	(4.3)	$	(6.0)
Total gains (losses) reclassified from AOCI to net income on cash flow hedges	$	34.9	$	0.6	$	10.5	$	—	$	—	$	—	$	1.9	$	(4.3)	$	(6.0)

The following table provides the impact of fair value hedge accounting on the carrying value of the designated hedged items, which includes hedged items no longer designated.

TABLE 118: HEDGED ITEMS IN FAIR VALUE HEDGES

	DECEMBER 31, 2023				DECEMBER 31, 2022
(In Millions)	CARRYING VALUE OF THE HEDGED ITEMS		CUMULATIVE HEDGE ACCOUNTING BASIS ADJUSTMENT(1)(3)		CARRYING VALUE OF THE HEDGED ITEMS		CUMULATIVE HEDGE ACCOUNTING BASIS ADJUSTMENT(2)(3)
Available for Sale Debt Securities(4)	$	5,048.8	$	77.5	$	1,820.8	$	(60.2)
Senior Notes and Long-Term Subordinated Debt	2,495.9		(248.7)		2,746.2		(294.0)

(1) The cumulative hedge accounting basis adjustment includes $2.2 million related to discontinued hedging relationships of AFS debt securities and $29.6 million related to discontinued hedging relationships in the cumulative hedge accounting basis adjustment of senior notes and long-term debt as of December 31, 2023.

(2) The cumulative hedge accounting basis adjustment includes $7.3 million related to discontinued hedging relationships of AFS debt securities as of December 31, 2022. There were no amounts related to discontinued hedging relationships in the cumulative hedge accounting basis adjustment of senior notes and long-term debt as of December 31, 2022.

(3) Positive (negative) amounts related to AFS securities represent cumulative fair value hedge basis adjustments that will reduce (increase) net interest income in future periods. Positive (negative) amounts related to Senior Notes and Long-Term Subordinated Debt represent cumulative fair value hedge basis adjustments that will increase (reduce) net interest income in future periods.

(4) Carrying value represents amortized cost.

Gains/Losses of Derivative Financial Instruments Not Designated as Hedging

The following table provides the location and amount of gains and losses recorded on the consolidated statements of income for the years ended December 31, 2023, 2022, and 2021 for derivative instruments not designated as hedges under GAAP.

TABLE 119: LOCATION AND AMOUNT OF GAINS AND LOSSES RECORDED IN INCOME FOR DERIVATIVES NOT DESIGNATED AS HEDGING UNDER GAAP

(In Millions)	DERIVATIVE GAINS (LOSSES) LOCATION RECOGNIZED IN INCOME	AMOUNT OF DERIVATIVE GAINS (LOSSES) RECOGNIZED IN INCOME
		2023		2022		2021
Non-designated risk management derivatives
Foreign Exchange Contracts	Other Operating Income	$	1.8	$	(3.1)	$	1.2
Other Financial Derivatives(1)	Other Operating Income	(21.2)		(22.2)		(21.3)
Gains (Losses) from non-designated risk management derivatives		$	(19.4)	$	(25.3)	$	(20.1)
Client-related and trading derivatives
Foreign Exchange Contracts	Foreign Exchange Trading Income	$	203.9	$	288.6	$	292.6
Interest Rate Contracts	Security Commissions and Trading Income	8.9		9.6		15.7
Gains (Losses) from client-related and trading derivatives		$	212.8	$	298.2	$	308.3
Total gains (losses) from derivatives not designated as hedging under GAAP		$	193.4	$	272.9	$	288.2

(1) This line includes swaps related to the sale of certain Visa Class B common shares and total return swap contracts.

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Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repurchase (Tables)

12 Months Ended

Dec. 31, 2023

Investments, Debt and Equity Securities [Abstract]

Securities Purchased under Agreements to Resell

($ In Millions)	2023			2022
Balance at December 31	$	784.7		$	1,070.3
Average Balance During the Year	950.9			1,071.2
Average Interest Rate Earned During the Year	166.71		%	9.68		%
Maximum Month-End Balance During the Year	$	1,326.2		$	1,320.8

Note: The table above includes the impact of balance sheet netting of approximately $29.1 billion and $3.6 billion in 2023 and 2022, respectively.

Securities Sold under Agreements to Repurchase

($ In Millions)	2023			2022
Balance at December 31	$	784.7		$	567.2
Average Balance During the Year	401.5			433.6
Average Interest Rate Paid During the Year	383.84		%	20.94		%
Maximum Month-End Balance During the Year	$	988.1		$	869.0

Note: The table above includes the impact of balance sheet netting of approximately $29.1 billion and $3.6 billion in 2023 and 2022, respectively.

Transfer of Certain Financial Assets Accounted for as Secured Borrowings

	REMAINING CONTRACTUAL MATURITY OF THE AGREEMENTS
	OVERNIGHT AND CONTINUOUS
(In Millions)	December 31, 2023		December 31, 2022
U.S. Treasury and Agency Securities	$	784.7	$	567.2
Total Borrowings	784.7		567.2
Net Amount of Recognized Liabilities for Repurchase Agreements in Note 27	784.7		567.2

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Offsetting of Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Securities Purchased Under Agreements to Resell and Derivative Assets in the Consolidated Balance Sheet

The following table provides information regarding the offsetting of derivative assets and of securities purchased under agreements to resell within the consolidated balance sheets as of December 31, 2023 and 2022.

TABLE 123: OFFSETTING OF DERIVATIVE ASSETS AND SECURITIES PURCHASED UNDER AGREEMENTS TO RESELL

	DECEMBER 31, 2023
(In Millions)	GROSS RECOGNIZED ASSETS		GROSS AMOUNTS OFFSET IN THE BALANCE SHEET(3)		NET AMOUNTS PRESENTED IN THE BALANCE SHEET		GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET(4)		NET AMOUNT(5)
Derivative Assets(1)
Foreign Exchange Contracts Over the Counter (OTC)	$	3,006.3	$	2,937.2	$	69.1	$	12.2	$	56.9
Interest Rate Swaps OTC	301.4		189.5		111.9		—		111.9
Interest Rate Swaps Exchange Cleared	0.1		—		0.1		—		0.1
Total Derivatives Subject to a Master Netting Arrangement	3,307.8		3,126.7		181.1		12.2		168.9
Total Derivatives Not Subject to a Master Netting Arrangement	260.4		—		260.4		—		260.4
Total Derivatives	3,568.2		3,126.7		441.5		12.2		429.3
Securities Purchased under Agreements to Resell(2)	$	62,860.2	$	62,075.5	$	784.7	$	—	$	784.7

	DECEMBER 31, 2022
(In Millions)	GROSS RECOGNIZED ASSETS		GROSS AMOUNTS OFFSET IN THE BALANCE SHEET(3)		NET AMOUNTS PRESENTED IN THE BALANCE SHEET		GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET(4)		NET AMOUNT(5)
Derivative Assets(1)
Foreign Exchange Contracts OTC	$	2,928.9	$	2,666.4	$	262.5	$	5.0	$	257.5
Interest Rate Swaps OTC	217.6		144.3		73.3		—		73.3
Interest Rate Swaps Exchange Cleared	4.4		—		4.4		—		4.4
Other Financial Derivatives	0.3		—		0.3		—		0.3
Total Derivatives Subject to a Master Netting Arrangement	3,151.2		2,810.7		340.5		5.0		335.5
Total Derivatives Not Subject to a Master Netting Arrangement	581.2		—		581.2		—		581.2
Total Derivatives	3,732.4		2,810.7		921.7		5.0		916.7
Securities Purchased under Agreements to Resell(2)	$	12,494.2	$	11,423.9	$	1,070.3	$	1,070.3	$	—

(1) Derivative assets are reported in Other Assets on the consolidated balance sheets. Other Assets (excluding derivative assets) totaled $10.3 billion and $8.9 billion as of December 31, 2023 and 2022, respectively.

(2) Offsetting of Securities Purchased under Agreements to Resell primarily relates to our involvement in the FICC.

(3) Including cash collateral received from counterparties.

(4) Including financial assets accepted as collateral which are received from counterparties.

(5) Northern Trust did not possess any cash collateral that was not offset on the consolidated balance sheets that could have been used to offset the net amounts presented on the consolidated balance sheets as of December 31, 2023 and 2022.

Securities Sold Under Agreements to Repurchase and Derivative Liabilities in the Consolidated Balance Sheet

The following table provides information regarding the offsetting of derivative liabilities and of securities sold under agreements to repurchase within the consolidated balance sheets as of December 31, 2023 and 2022.

TABLE 124: OFFSETTING OF DERIVATIVE LIABILITIES AND SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE

	DECEMBER 31, 2023
(In Millions)	GROSS RECOGNIZED LIABILITIES		GROSS AMOUNTS OFFSET IN THE BALANCE SHEET(3)		NET AMOUNTS PRESENTED IN THE BALANCE SHEET		GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET(4)		NET AMOUNT(5)
Derivative Liabilities(1)
Foreign Exchange Contracts OTC	$	2,411.7	$	2,175.7	$	236.0	$	—	$	236.0
Interest Rate Swaps OTC	368.3		6.0		362.3		—		362.3
Interest Rate Swaps Exchange Cleared	0.9		—		0.9		—		0.9
Other Financial Derivatives	25.4		23.7		1.7		—		1.7
Total Derivatives Subject to a Master Netting Arrangement	2,806.3		2,205.4		600.9		—		600.9
Total Derivatives Not Subject to a Master Netting Arrangement	843.5		—		843.5		—		843.5
Total Derivatives	3,649.8		2,205.4		1,444.4		—		1,444.4
Securities Sold under Agreements to Repurchase(2)	$	62,860.2	$	62,075.5	$	784.7	$	784.7	$	—

	DECEMBER 31, 2022
(In Millions)	GROSS RECOGNIZED LIABILITIES		GROSS AMOUNTS OFFSET IN THE BALANCE SHEET(3)		NET AMOUNTS PRESENTED IN THE BALANCE SHEET		GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET(4)		NET AMOUNT(5)
Derivative Liabilities(1)
Foreign Exchange Contracts OTC	$	2,082.3	$	1,826.7	$	255.6	$	—	$	255.6
Interest Rate Swaps OTC	426.5		5.9		420.6		—		420.6
Interest Rate Swaps Exchange Cleared	5.3		—		5.3		—		5.3
Other Financial Derivatives	34.8		33.3		1.5		—		1.5
Total Derivatives Subject to a Master Netting Arrangement	2,548.9		1,865.9		683.0		—		683.0
Total Derivatives Not Subject to a Master Netting Arrangement	1,105.2		—		1,105.2		—		1,105.2
Total Derivatives	3,654.1		1,865.9		1,788.2		—		1,788.2
Securities Sold under Agreements to Repurchase(2)	$	11,991.1	$	11,423.9	$	567.2	$	567.2	$	—

(1) Derivative liabilities are reported in Other Liabilities on the consolidated balance sheets. Other Liabilities (excluding derivative liabilities) totaled $4.0 billion and $3.2 billion as of December 31, 2023 and 2022, respectively.

(2) Offsetting of Securities Sold under Agreements to Repurchase primarily relates to our involvement in the FICC.

(3) Including cash collateral deposited with counterparties.

(4) Including financial assets accepted as collateral which are deposited with counterparties.

(5) Northern Trust did not place any cash collateral with counterparties that was not offset on the consolidated balance sheets that could have been used to offset the net amounts presented on the consolidated balance sheets as of December 31, 2023 and 2022.

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Organization, Consolidation and Presentation of Financial Statements (Tables)

12 Months Ended

Dec. 31, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Variable Interest Entities

TABLE 125: SUMMARY OF UNCONSOLIDATED TAX CREDIT STRUCTURES

(In Millions)	DECEMBER 31, 2023		DECEMBER 31, 2022
Investment Carrying Amount
Affordable Housing	$	622.8	$	635.9
Other Community Development	266.3		268.4
Total Investment Carrying Amount(1)	$	889.1	$	904.3
Unfunded Commitments
Affordable Housing	$	178.8	$	218.9
Other Community Development	—		—
Total Unfunded Commitments(2)	$	178.8	$	218.9

(1)    As of December 31, 2023 and December 31, 2022, $857.0 million and $867.2 million are VIEs, respectively.

(2) As of December 31, 2023 and December 31, 2022, $172.0 million and $210.1 million relate to undrawn commitments on VIEs, respectively.

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Pledged Assets, Accepted Collateral and Restricted Assets (Tables)

12 Months Ended

Dec. 31, 2023

Financial Instruments Owned and Pledged as Collateral [Abstract]

Type of Pledged Assets

The following table presents the carrying value of Northern Trust’s pledged assets by type.

TABLE 126: TYPE OF PLEDGED ASSETS

	FOR THE YEAR ENDED DECEMBER 31,
(In Billions)	2023		2022
Debt Securities(1)	$	33.0	$	31.4
Loans(2)	10.3		11.8
Total Pledged Assets	$	43.3	$	43.2

(1) Debt securities are comprised of held to maturity and available for sale securities.

(2) Loans pledged at the FHLB of Chicago and the Federal Reserve Bank of Chicago.

Accepted Collateral

The following table presents the fair value of securities accepted as collateral.

TABLE 127: ACCEPTED COLLATERAL

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022
Collateral that may be repledged or sold
Reverse repurchase agreements(1)	$	62,767.8	$	12,119.4
Derivative contracts	12.2		5.0
Collateral that may not be repledged or sold
Reverse repurchase agreements	—		450.0
Total Collateral Accepted	$	62,780.0	$	12,574.4

(1) The fair value of securities collateral that was repledged or sold totaled $62.0 billion and $11.5 billion at December 31, 2023 and 2022, respectively. This primarily includes collateral accepted as related to the sponsored member program. Refer to Note 24, “Commitments and Contingent Liabilities” and Note 27, “Offsetting of Assets and Liabilities” for further information.

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Reporting Segments and Related Information (Tables)

12 Months Ended

Dec. 31, 2023

Segment Reporting [Abstract]

Earnings Contribution of Northern Trust's Reporting Segments

The following tables reflect the earnings contribution and average assets of Northern Trust’s reporting segments for the years ended December 31, 2023, 2022, and 2021. Segment results are stated on an FTE basis which has no impact on net income. Financial measures stated on an FTE basis includes FTE adjustments of $57.5 million, $45.6 million, and $35.6 million for 2023, 2022, and 2021, respectively.

TABLE 128: ASSET SERVICING RESULTS OF OPERATIONS

	FOR THE YEAR ENDED DECEMBER 31,
($ In Millions)	2023			2022			2021
Noninterest Income
Trust, Investment and Other Servicing Fees	$	2,461.9		$	2,496.3		$	2,487.3
Foreign Exchange Trading Income	213.0			281.0			279.0
Other Noninterest Income	263.4			250.7			261.2
Total Noninterest Income	2,938.3			3,028.0			3,027.5
Net Interest Income(1)	1,197.3			1,072.7			637.2
Revenue(1)	4,135.6			4,100.7			3,664.7
Provision for (Release of) Credit Losses	0.5			2.4			(33.8)
Noninterest Expense	3,273.2			3,092.7			2,863.0
Income before Income Taxes(1)	861.9			1,005.6			835.5
Provision for Income Taxes(1)	187.1			243.2			194.1
Net Income	$	674.8		$	762.4		$	641.4
Percentage of Consolidated Net Income	61		%	57		%	41		%
Average Assets	$	101,472.6		$	115,646.4		$	120,883.2

(1) Financial measures stated on an FTE basis.

TABLE 129: WEALTH MANAGEMENT RESULTS OF OPERATIONS

	FOR THE YEAR ENDED DECEMBER 31,
($ In Millions)	2023			2022			2021
Noninterest Income
Trust, Investment and Other Servicing Fees	$	1,899.9		$	1,936.3		$	1,873.8
Foreign Exchange Trading Income (Loss)	(9.1)			7.6			13.6
Other Noninterest Income	150.8			137.7			188.2
Total Noninterest Income	2,041.6			2,081.6			2,075.6
Net Interest Income(1)	842.2			860.1			781.1
Revenue(1)	2,883.8			2,941.7			2,856.7
Provision for (Release of) Credit Losses	24.0			9.6			(47.7)
Noninterest Expense	1,882.3			1,815.5			1,651.1
Income before Income Taxes(1)	977.5			1,116.6			1,253.3
Provision for Income Taxes(1)	245.9			310.0			317.0
Net Income	$	731.6		$	806.6		$	936.3
Percentage of Consolidated Net Income	66		%	60		%	61		%
Average Assets	$	41,176.6		$	36,905.5		$	35,480.0

(1) Financial measures stated on an FTE basis.

TABLE 130: OTHER RESULTS OF OPERATIONS

	FOR THE YEAR ENDED DECEMBER 31,
($ In Millions)	2023			2022			2021
Noninterest Income (Loss)	$	(188.4)		$	(235.6)		$	(21.3)
Net Interest Income(1)	—			—			—
Revenue(1)	(188.4)			(235.6)			(21.3)
Noninterest Expense	128.7			74.7			21.8
Income (Loss) before Income Taxes(1)	(317.1)			(310.3)			(43.1)
Provision (Benefit) for Income Taxes(1)	(18.0)			(77.3)			(10.7)
Net Income (Loss)	$	(299.1)		$	(233.0)		$	(32.4)
Percentage of Consolidated Net Income (Loss)	(27)		%	(17)		%	(2)		%
Average Assets	$	—		$	—		$	—

(1) Financial measures stated on an FTE basis.

TABLE 131: CONSOLIDATED FINANCIAL INFORMATION

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
Noninterest Income
Trust, Investment and Other Servicing Fees	$	4,361.8	$	4,432.6	$	4,361.1
Foreign Exchange Trading Income	203.9		288.6		292.6
Other Noninterest Income	225.8		152.8		428.1
Total Noninterest Income	4,791.5		4,874.0		5,081.8
Net Interest Income	1,982.0		1,887.2		1,382.7
Revenue	6,773.5		6,761.2		6,464.5
Provision for (Release of) Credit Losses	24.5		12.0		(81.5)
Noninterest Expense	5,284.2		4,982.9		4,535.9
Income before Income Taxes	1,464.8		1,766.3		2,010.1
Provision for Income Taxes	357.5		430.3		464.8
Net Income	$	1,107.3	$	1,336.0	$	1,545.3
Average Assets	$	142,649.2	$	152,551.9	$	156,363.2

Distribution of Total Assets and Operating Performance

The following table summarizes Northern Trust’s performance based on the allocation process described above without regard to guarantors or the location of collateral.

TABLE 132: DISTRIBUTION OF TOTAL ASSETS AND OPERATING PERFORMANCE

($ In Millions)	TOTAL ASSETS		% OF TOTAL		TOTAL REVENUE(1)		% OF TOTAL		INCOME BEFORE INCOME TAXES		% OF TOTAL		NET INCOME		% OF TOTAL
2023
Non-U.S.	$	39,661.5	26	%	$	2,156.1	32	%	$	473.7	32	%	$	354.0	32	%
U.S.	111,121.6		74	%	4,617.4		68	%	991.1		68	%	753.3		68	%
Total	$	150,783.1	100	%	$	6,773.5	100	%	$	1,464.8	100	%	$	1,107.3	100	%
2022
Non-U.S.	$	35,991.3	23	%	$	2,273.3	34	%	$	560.9	32	%	$	420.2	31	%
U.S.	119,045.4		77	%	4,487.9		66	%	1,205.4		68	%	915.8		69	%
Total	$	155,036.7	100	%	$	6,761.2	100	%	$	1,766.3	100	%	$	1,336.0	100	%
2021
Non-U.S.	$	38,555.3	21	%	$	2,017.5	31	%	$	569.4	28	%	$	426.7	28	%
U.S.	145,334.5		79	%	4,447.0		69	%	1,440.7		72	%	1,118.6		72	%
Total	$	183,889.8	100	%	$	6,464.5	100	%	$	2,010.1	100	%	$	1,545.3	100	%

(1) Total revenue is comprised of net interest income and noninterest income.

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Regulatory Capital Requirements (Tables)

12 Months Ended

Dec. 31, 2023

Regulatory Capital Requirements Abstract [Abstract]

Risk-Based Capital Amounts and Ratios for Northern Trust on Consolidated Basis and for Bank

The following table provides capital ratios for the Corporation and the Bank determined by Basel III phased in requirements.

TABLE 133: RISK-BASED AND LEVERAGE CAPITAL AMOUNTS AND RATIOS

	DECEMBER 31, 2023								DECEMBER 31, 2022
($ In Millions)	STANDARDIZED APPROACH				ADVANCED APPROACH				STANDARDIZED APPROACH				ADVANCED APPROACH
	BALANCE		RATIO		BALANCE		RATIO		BALANCE		RATIO		BALANCE		RATIO
Common Equity Tier 1 Capital
Northern Trust Corporation	$	10,179.4	11.4	%	$	10,179.4	13.4	%	$	9,539.7	10.8	%	$	9,539.7	11.5	%
The Northern Trust Company	10,806.2		12.2		10,806.2		14.6		10,111.2		11.6		10,111.2		12.4
Minimum to qualify as well-capitalized:
Northern Trust Corporation	N/A		N/A		N/A		N/A		N/A		N/A		N/A		N/A
The Northern Trust Company	5,768.4		6.5		4,808.6		6.5		5,684.4		6.5		5,286.2		6.5
Tier 1 Capital
Northern Trust Corporation	11,023.9		12.3		11,023.9		14.5		10,397.4		11.8		10,397.4		12.5
The Northern Trust Company	10,806.2		12.2		10,806.2		14.6		10,111.2		11.6		10,111.2		12.4
Minimum to qualify as well-capitalized:
Northern Trust Corporation	5,371.6		6.0		4,558.8		6.0		5,286.5		6.0		4,990.9		6.0
The Northern Trust Company	7,099.5		8.0		5,918.3		8.0		6,996.2		8.0		6,506.1		8.0
Total Capital
Northern Trust Corporation	12,733.9		14.2		12,514.7		16.5		12,245.5		13.9		12,045.9		14.5
The Northern Trust Company	12,279.3		13.8		12,060.2		16.3		11,766.8		13.5		11,567.2		14.2
Minimum to qualify as well-capitalized:
Northern Trust Corporation	8,952.7		10.0		7,598.0		10.0		8,810.8		10.0		8,318.1		10.0
The Northern Trust Company	8,874.4		10.0		7,397.9		10.0		8,745.3		10.0		8,132.6		10.0
Tier 1 Leverage
Northern Trust Corporation	11,023.9		8.1		11,023.9		8.1		10,397.4		7.1		10,397.4		7.1
The Northern Trust Company	10,806.2		8.0		10,806.2		8.0		10,111.2		6.9		10,111.2		6.9
Minimum to qualify as well-capitalized:
Northern Trust Corporation	N/A		N/A		N/A		N/A		N/A		N/A		N/A		N/A
The Northern Trust Company	6,764.0		5.0		6,764.0		5.0		7,323.8		5.0		7,323.8		5.0
Supplementary Leverage(1)
Northern Trust Corporation	N/A		N/A		11,023.9		8.6		N/A		N/A		10,397.4		7.9
The Northern Trust Company	N/A		N/A		10,806.2		8.5		N/A		N/A		10,111.2		7.7
Minimum to qualify as well-capitalized:
Northern Trust Corporation	N/A		N/A		N/A		N/A		N/A		N/A		N/A		N/A
The Northern Trust Company	N/A		N/A		3,825.6		3.0		N/A		N/A		3,931.5		3.0

(1) In November 2019, the Federal Reserve Board and other U.S. federal banking agencies adopted a final rule that established a deduction for central bank deposits from the total leverage exposures of custodial banking organizations, including the Corporation and the Bank, equal to the lesser of (i) the total amount of funds the custodial banking organization and its consolidated subsidiaries have on deposit at qualifying central banks and (ii) the total amount of client funds on deposit at the custodial banking organization that are linked to fiduciary or custodial and safekeeping accounts. The rule became effective on April 1, 2020.

The supplementary leverage ratios at December 31, 2023 and December 31, 2022 for the Corporation and the Bank reflect the impact of the final rule.

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Northern Trust Corporation (Corporation only) (Tables) - Parent Company

12 Months Ended

Dec. 31, 2023

Condensed Financial Statements, Captions [Line Items]

Condensed Balance Sheet

	DECEMBER 31,
(In Millions)	2023		2022
ASSETS
Cash on Deposit with Subsidiary Bank	$	795.5	$	601.4
Advances to Wholly-Owned Subsidiaries – Banks	3,760.0		4,010.0
Investments in Wholly-Owned Subsidiaries – Banks	11,591.4		10,897.1
– Nonbank	209.7		194.7
Other Assets	1,233.1		1,226.3
Total Assets	$	17,589.7	$	16,929.5
LIABILITIES
Senior Notes	$	2,773.2	$	2,724.2
Long-Term Debt	2,065.0		2,066.2
Other Liabilities	853.6		879.6
Total Liabilities	5,691.8		5,670.0
STOCKHOLDERS’ EQUITY
Preferred Stock	884.9		884.9
Common Stock	408.6		408.6
Additional Paid-in Capital	1,009.6		983.5
Retained Earnings	14,233.8		13,798.5
Accumulated Other Comprehensive Income (Loss)	(1,137.9)		(1,569.2)
Treasury Stock	(3,501.1)		(3,246.8)
Total Stockholders’ Equity	11,897.9		11,259.5
Total Liabilities and Stockholders’ Equity	$	17,589.7	$	16,929.5

Condensed Statement of Income

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
OPERATING INCOME
Dividends – Bank Subsidiaries	$	850.0	$	—	$	751.1
– Nonbank Subsidiaries	—		—		8.3
Intercompany Interest and Other Charges	260.2		112.8		20.1
Interest and Other Income	12.2		(5.7)		32.3
Total Operating Income	1,122.4		107.1		811.8
OPERATING EXPENSES
Interest Expense	279.5		132.3		71.3
Other Operating Expenses	32.3		11.9		36.7
Total Operating Expenses	311.8		144.2		108.0
Income (Loss) before Income Taxes and Equity in Undistributed Net Income of Subsidiaries	810.6		(37.1)		703.8
Benefit for Income Taxes	12.4		16.9		25.7
Income (Loss) before Equity in Undistributed Net Income of Subsidiaries	823.0		(20.2)		729.5
Equity in Undistributed Net Income of Subsidiaries – Banks	269.4		1,338.5		803.3
– Nonbank	14.9		17.7		12.5
Net Income	$	1,107.3	$	1,336.0	$	1,545.3
Preferred Stock Dividends	41.8		41.8		41.8
Net Income Applicable to Common Stock	$	1,065.5	$	1,294.2	$	1,503.5

Condensed Statement of Cash Flows

	FOR THE YEAR ENDED DECEMBER 31,
(In Millions)	2023		2022		2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	$	1,107.3	$	1,336.0	$	1,545.3
Adjustments to Reconcile Net Income to Net Cash Provided by (Used in) Operating Activities
Equity in Undistributed Net Income of Subsidiaries	(284.3)		(1,356.2)		(815.8)
Change in Prepaid Expenses	1.7		(3.8)		0.1
Change in Accrued Income Taxes	(10.2)		36.6		2.2
Other Operating Activities, net	138.1		(608.2)		236.6
Net Cash Provided by (Used in) Operating Activities	952.6		(595.6)		968.4
CASH FLOWS FROM INVESTING ACTIVITIES
Investments in and Advances to Subsidiaries, net	250.0		(1,200.1)		(140.0)
Other Investing Activities, net	—		(0.1)		5.1
Net Cash Provided by (Used in) Investing Activities	250.0		(1,200.2)		(134.9)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from Senior Notes	—		1,988.8		—
Repayments of Senior Notes	—		(500.0)		(500.0)
Repayment of Floating Rate Capital Debt	—		—		(278.8)
Treasury Stock Purchased	(347.5)		(35.4)		(267.6)
Net Proceeds from Stock Options	2.3		3.9		53.8
Cash Dividends Paid on Common Stock	(621.5)		(750.2)		(583.3)
Cash Dividends Paid on Preferred Stock	(41.8)		(46.5)		(41.8)
Other Financing Activities, net	—		4.9		(0.1)
Net Cash (Used in) Provided by Financing Activities	(1,008.5)		665.5		(1,617.8)
Net Change in Cash on Deposit with Subsidiary Bank	194.1		(1,130.3)		(784.3)
Cash on Deposit with Subsidiary Bank at Beginning of Year	601.4		1,731.7		2,516.0
Cash on Deposit with Subsidiary Bank at End of Year	$	795.5	$	601.4	$	1,731.7

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Summary of Significant Accounting Policies - Narrative (Detail)	12 Months Ended
	Dec. 31, 2023 location segment
Property, Plant and Equipment [Line Items]
Number of client-focused reportable segment | segment	2
Buildings | Upper Limit
Property, Plant and Equipment [Line Items]
Charge for depreciation, range of life	30 years
Equipment | Lower Limit
Property, Plant and Equipment [Line Items]
Charge for depreciation, range of life	3 years
Equipment | Upper Limit
Property, Plant and Equipment [Line Items]
Charge for depreciation, range of life	10 years
Computer Software
Property, Plant and Equipment [Line Items]
Software, useful life	15 years
Computer Software | Lower Limit
Property, Plant and Equipment [Line Items]
Software, useful life	3 years
Computer Software | Upper Limit
Property, Plant and Equipment [Line Items]
Software, useful life	10 years
WEALTH MANAGEMENT
Property, Plant and Equipment [Line Items]
Services provided by business units, states | location	19

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Fair Value Measurements - Narrative (Detail) shares in Millions, $ in Millions	Dec. 31, 2023 USD ($) security	Dec. 31, 2022 USD ($) security	Jun. 30, 2016 shares	Jun. 30, 2015 shares
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale	$ 23,089.8	$ 26,699.9
Trading account securities	0.0	95.2
Visa Class B
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Common stock issued (in shares) | shares			1.1	1.0
LEVEL 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale	$ 19,500.0	$ 24,000.0
Number of available for sale securities portfolio | security	929	1,163
Fair Value, Measurements, Nonrecurring | LEVEL 3 | Discount factor applied to real estate collateral-dependent loans to reflect realizable value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, measurement input	0.020	0.172
Loans | Fair Value, Measurements, Nonrecurring | LEVEL 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets, fair value	$ 43.3	$ 6.6

XML

Fair Value Measurements - Level 3 Significant Unobservable Inputs (Detail) $ in Millions	Dec. 31, 2023 USD ($) year month	Dec. 31, 2022 USD ($) month
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative liability | $	$ 1,444.4	$ 1,788.2
Swap | Fair Value, Measurements, Recurring | LEVEL 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative liability | $	$ 25.4	$ 34.8
Conversion Rate | Swap | Fair Value, Measurements, Recurring | LEVEL 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative liability, measurement input	1.59	1.60
Visa Class A Appreciation | Swap | Fair Value, Measurements, Recurring | LEVEL 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative liability, measurement input	0.1049	0.0853
Expected Duration | Swap | Fair Value, Measurements, Recurring | LEVEL 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative liability, measurement input | month	13	20
Expected Duration | Swap | Fair Value, Measurements, Recurring | LEVEL 3 | Lower Limit
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative liability, measurement input	9	12
Expected Duration | Swap | Fair Value, Measurements, Recurring | LEVEL 3 | Upper Limit
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative liability, measurement input | month	27	33

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Fair Value Measurements - Recurring Basis Hierarchy Leveling (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	$ 23,089.8	$ 26,699.9
Derivative Assets	3,568.2	3,732.4
Asset, Netting	(3,126.7)	(2,810.7)
Derivative Asset	$ 441.5	$ 921.7
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets	Other Assets
Derivative Liabilities	$ 3,649.8	$ 3,654.1
Liability, Netting	(2,205.4)	(1,865.9)
Derivative Liabilities	$ 1,444.4	$ 1,788.2
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities	Other Liabilities
Cross Product Collateral Adjustment
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Asset, Netting	$ (2,093.8)	$ (1,140.2)
Liability, Netting	(1,172.5)	(195.3)
LEVEL 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	19,500.0	24,000.0
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	23,089.8	26,699.9
Trading Account		95.2
Total Available for Sale and Trading Debt Securities		26,795.1
Fair Value, Measurements, Recurring | Other Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money Market Investment	95.0
Asset, Netting	(3,126.7)	(2,810.7)
Derivative Asset	441.5	921.7
Fair Value, Measurements, Recurring | Other Assets | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Asset, Netting	(2,937.2)	(2,666.4)
Derivative Asset	329.5	843.7
Fair Value, Measurements, Recurring | Other Assets | Interest Rate Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Asset, Netting	(189.5)	(144.3)
Derivative Asset	112.0	77.7
Fair Value, Measurements, Recurring | Other Assets | Other Financial Derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Asset, Netting		0.0
Derivative Asset		0.3
Fair Value, Measurements, Recurring | Other Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Liability, Netting	(2,205.4)	(1,865.9)
Derivative Liabilities	1,444.4	1,788.2
Fair Value, Measurements, Recurring | Other Liabilities | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Liability, Netting	(2,175.7)	(1,826.7)
Derivative Liabilities	1,079.5	1,360.8
Fair Value, Measurements, Recurring | Other Liabilities | Interest Rate Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Liability, Netting	(6.0)	(5.9)
Derivative Liabilities	363.2	425.9
Fair Value, Measurements, Recurring | Other Liabilities | Other Financial Derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Liability, Netting	(23.7)	(33.3)
Derivative Liabilities	1.7	1.5
Fair Value, Measurements, Recurring | LEVEL 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	3,622.2	2,747.4
Trading Account		95.0
Total Available for Sale and Trading Debt Securities		2,842.4
Fair Value, Measurements, Recurring | LEVEL 1 | Other Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money Market Investment	95.0
Derivative Assets	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Other Assets | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Assets	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Other Assets | Interest Rate Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Assets	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Other Assets | Other Financial Derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Assets		0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Other Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Other Liabilities | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Other Liabilities | Interest Rate Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Other Liabilities | Other Financial Derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	19,467.6	23,952.5
Trading Account		0.2
Total Available for Sale and Trading Debt Securities		23,952.7
Fair Value, Measurements, Recurring | LEVEL 2 | Other Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money Market Investment	0.0
Derivative Assets	3,568.2	3,732.4
Fair Value, Measurements, Recurring | LEVEL 2 | Other Assets | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Assets	3,266.7	3,510.1
Fair Value, Measurements, Recurring | LEVEL 2 | Other Assets | Interest Rate Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Assets	301.5	222.0
Fair Value, Measurements, Recurring | LEVEL 2 | Other Assets | Other Financial Derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Assets		0.3
Fair Value, Measurements, Recurring | LEVEL 2 | Other Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities	3,624.4	3,619.3
Fair Value, Measurements, Recurring | LEVEL 2 | Other Liabilities | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities	3,255.2	3,187.5
Fair Value, Measurements, Recurring | LEVEL 2 | Other Liabilities | Interest Rate Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities	369.2	431.8
Fair Value, Measurements, Recurring | LEVEL 2 | Other Liabilities | Other Financial Derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	0.0	0.0
Trading Account		0.0
Total Available for Sale and Trading Debt Securities		0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Other Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money Market Investment	0.0
Derivative Assets	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Other Assets | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Assets	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Other Assets | Interest Rate Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Assets	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Other Assets | Other Financial Derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Assets		0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Other Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities	25.4	34.8
Fair Value, Measurements, Recurring | LEVEL 3 | Other Liabilities | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Other Liabilities | Interest Rate Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Other Liabilities | Other Financial Derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities	25.4	34.8
U.S. Government
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	3,622.2	2,747.4
U.S. Government | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	3,622.2	2,747.4
U.S. Government | Fair Value, Measurements, Recurring | LEVEL 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	3,622.2	2,747.4
U.S. Government | Fair Value, Measurements, Recurring | LEVEL 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	0.0	0.0
U.S. Government | Fair Value, Measurements, Recurring | LEVEL 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	0.0	0.0
Obligations of States and Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	295.8	787.6
Obligations of States and Political Subdivisions | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	295.8	787.6
Obligations of States and Political Subdivisions | Fair Value, Measurements, Recurring | LEVEL 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	0.0	0.0
Obligations of States and Political Subdivisions | Fair Value, Measurements, Recurring | LEVEL 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	295.8	787.6
Obligations of States and Political Subdivisions | Fair Value, Measurements, Recurring | LEVEL 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	0.0	0.0
Government Sponsored Agency
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	11,553.0	11,545.2
Government Sponsored Agency | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	11,553.0	11,545.2
Government Sponsored Agency | Fair Value, Measurements, Recurring | LEVEL 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	0.0	0.0
Government Sponsored Agency | Fair Value, Measurements, Recurring | LEVEL 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	11,553.0	11,545.2
Government Sponsored Agency | Fair Value, Measurements, Recurring | LEVEL 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	0.0	0.0
Non-U.S. Government
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	264.4	360.0
Non-U.S. Government | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	264.4	360.0
Non-U.S. Government | Fair Value, Measurements, Recurring | LEVEL 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	0.0	0.0
Non-U.S. Government | Fair Value, Measurements, Recurring | LEVEL 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	264.4	360.0
Non-U.S. Government | Fair Value, Measurements, Recurring | LEVEL 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	0.0	0.0
Corporate Debt
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	279.5	1,747.6
Corporate Debt | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	279.5	1,747.6
Corporate Debt | Fair Value, Measurements, Recurring | LEVEL 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	0.0	0.0
Corporate Debt | Fair Value, Measurements, Recurring | LEVEL 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	279.5	1,747.6
Corporate Debt | Fair Value, Measurements, Recurring | LEVEL 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	0.0	0.0
Covered Bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	347.1	388.7
Covered Bonds | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	347.1	388.7
Covered Bonds | Fair Value, Measurements, Recurring | LEVEL 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	0.0	0.0
Covered Bonds | Fair Value, Measurements, Recurring | LEVEL 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	347.1	388.7
Covered Bonds | Fair Value, Measurements, Recurring | LEVEL 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	0.0	0.0
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	2,899.9	2,479.4
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	2,899.9	2,479.4
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds | Fair Value, Measurements, Recurring | LEVEL 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	0.0	0.0
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds | Fair Value, Measurements, Recurring | LEVEL 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	2,899.9	2,479.4
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds | Fair Value, Measurements, Recurring | LEVEL 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	0.0	0.0
Other Asset-Backed
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	2,962.6	5,256.2
Other Asset-Backed | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	2,962.6	5,256.2
Other Asset-Backed | Fair Value, Measurements, Recurring | LEVEL 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	0.0	0.0
Other Asset-Backed | Fair Value, Measurements, Recurring | LEVEL 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	2,962.6	5,256.2
Other Asset-Backed | Fair Value, Measurements, Recurring | LEVEL 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	0.0	0.0
Commercial Mortgage-Backed
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	865.3	1,387.8
Commercial Mortgage-Backed | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	865.3	1,387.8
Commercial Mortgage-Backed | Fair Value, Measurements, Recurring | LEVEL 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	0.0	0.0
Commercial Mortgage-Backed | Fair Value, Measurements, Recurring | LEVEL 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	865.3	1,387.8
Commercial Mortgage-Backed | Fair Value, Measurements, Recurring | LEVEL 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale	$ 0.0	$ 0.0

XML

Fair Value Measurements - Changes in Level 3 Liabilities (Detail) - Visa Conversion Rate Swap - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 34.8	$ 37.5
Total (Gains) Losses:
Included in Earnings	18.9	22.6
Purchases, Issues, Sales, and Settlements
Settlements	(28.3)	(25.3)
Balance at end of period	25.4	34.8
Unrealized Losses (Gains) Included in Earnings Related to Financial Instruments Held at December 31	$ 15.4	$ 16.6

XML

Fair Value Measurements - Valuation Techniques, Significant Unobservable Inputs, Quantitative Information Non-recurring Basis (Detail) - Discount factor applied to real estate collateral-dependent loans to reflect realizable value - Fair Value, Measurements, Nonrecurring - LEVEL 3 $ in Millions	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
INPUT VALUES	0.020	0.172
Lower Limit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
INPUT VALUES	0.000	0.150
Upper Limit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
INPUT VALUES	0.200	0.200
Loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
FAIR VALUE	$ 43.3	$ 6.6

XML

Fair Value Measurements (Fair Value of Financial Instruments) (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
ASSETS
Cash and Due from Banks	$ 4,791,500,000	$ 4,654,200,000
Federal Reserve and Other Central Bank Deposits	34,326,200,000	40,030,400,000
Interest-Bearing Deposits with Banks	1,939,000,000	1,941,100,000
Federal Funds Sold	800,000,000
Balance at December 31	784,700,000	1,070,300,000
FAIR VALUE	24,473,000,000	22,879,300,000
LIABILITIES
Deposits	116,164,000,000	123,932,100,000
Federal Funds Purchased	3,045,400,000	1,896,900,000
Balance at December 31	784,700,000	567,200,000
Other Borrowings	6,567,800,000	7,592,300,000
Senior Notes	2,773,200,000	2,724,200,000
Unfunded Commitments	0	0
BOOK VALUE
ASSETS
Cash and Due from Banks	4,791,500,000	4,654,200,000
Federal Reserve and Other Central Bank Deposits	34,326,200,000	40,030,400,000
Interest-Bearing Deposits with Banks	1,939,000,000	1,941,100,000
Federal Funds Sold		32,000,000.0
Balance at December 31	784,700,000	1,070,300,000
FAIR VALUE	26,221,700,000	25,036,100,000
Loans
Held for Investment	47,438,300,000	42,749,000,000
Other Assets	1,476,600,000	1,476,900,000
LIABILITIES
Deposits	116,164,000,000	123,932,100,000
Federal Funds Purchased	3,045,400,000	1,896,900,000
Balance at December 31	784,700,000	567,200,000
Other Borrowings	6,567,800,000	7,592,300,000
Senior Notes	2,773,200,000	2,724,200,000
Long-Term Debt	4,065,000,000	2,066,200,000
Unfunded Commitments	178,800,000	218,900,000
Other Liabilities	74,900,000	73,200,000
FAIR VALUE
ASSETS
Cash and Due from Banks	4,791,500,000	4,654,200,000
Federal Reserve and Other Central Bank Deposits	34,326,200,000	40,030,400,000
Interest-Bearing Deposits with Banks	1,939,000,000	1,941,100,000
Federal Funds Sold		32,000,000.0
Balance at December 31	784,700,000	1,070,300,000
FAIR VALUE	24,473,000,000	22,879,300,000
Loans
Held for Investment	47,598,300,000	42,636,500,000
Other Assets	1,458,000,000	1,460,400,000
LIABILITIES
Deposits	116,207,600,000	123,926,900,000
Federal Funds Purchased	3,045,400,000	1,896,900,000
Balance at December 31	784,700,000	567,200,000
Other Borrowings	6,607,400,000	7,592,800,000
Senior Notes	2,798,100,000	2,729,800,000
Long-Term Debt	4,186,800,000	2,110,700,000
Unfunded Commitments	178,800,000	218,900,000
Other Liabilities	74,900,000	73,200,000
FAIR VALUE | LEVEL 1
ASSETS
Cash and Due from Banks	4,791,500,000	4,654,200,000
Federal Reserve and Other Central Bank Deposits	0	0
Interest-Bearing Deposits with Banks	0	0
Federal Funds Sold		0
Balance at December 31	0	0
FAIR VALUE	0	50,000,000.0
Loans
Held for Investment	0	0
Other Assets	86,100,000	94,700,000
LIABILITIES
Deposits	0	0
Federal Funds Purchased	0	0
Balance at December 31	0	0
Other Borrowings	0	0
Senior Notes	0	0
Long-Term Debt	0	0
Unfunded Commitments	0	0
Other Liabilities	0	0
FAIR VALUE | LEVEL 2
ASSETS
Cash and Due from Banks	0	0
Federal Reserve and Other Central Bank Deposits	34,326,200,000	40,030,400,000
Interest-Bearing Deposits with Banks	1,939,000,000	1,941,100,000
Federal Funds Sold		32,000,000.0
Balance at December 31	784,700,000	1,070,300,000
FAIR VALUE	24,473,000,000	22,829,300,000
Loans
Held for Investment	0	0
Other Assets	1,371,900,000	1,365,700,000
LIABILITIES
Deposits	116,207,600,000	123,926,900,000
Federal Funds Purchased	3,045,400,000	1,896,900,000
Balance at December 31	784,700,000	567,200,000
Other Borrowings	6,607,400,000	7,592,800,000
Senior Notes	2,798,100,000	2,729,800,000
Long-Term Debt	4,186,800,000	2,110,700,000
Unfunded Commitments	178,800,000	218,900,000
Other Liabilities	0	0
FAIR VALUE | LEVEL 3
ASSETS
Cash and Due from Banks	0	0
Federal Reserve and Other Central Bank Deposits	0	0
Interest-Bearing Deposits with Banks	0	0
Federal Funds Sold		0
Balance at December 31	0	0
FAIR VALUE	0	0
Loans
Held for Investment	47,598,300,000	42,636,500,000
Other Assets	0	0
LIABILITIES
Deposits	0	0
Federal Funds Purchased	0	0
Balance at December 31	0	0
Other Borrowings	0	0
Senior Notes	0	0
Long-Term Debt	0	0
Unfunded Commitments	0	0
Other Liabilities	$ 74,900,000	$ 73,200,000

XML

Securities (Reconciliation of Amortized Cost to Fair Value of Securities Available for Sale) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Investment Holdings [Line Items]
AMORTIZED COST	$ 23,659.0	$ 27,760.0
GROSS UNREALIZED GAINS	13.2	7.7
GROSS UNREALIZED LOSSES	582.4	1,067.8
FAIR VALUE	23,089.8	26,699.9
U.S. Government
Investment Holdings [Line Items]
AMORTIZED COST	3,681.5	2,837.7
GROSS UNREALIZED GAINS	2.2	2.5
GROSS UNREALIZED LOSSES	61.5	92.8
FAIR VALUE	3,622.2	2,747.4
Obligations of States and Political Subdivisions
Investment Holdings [Line Items]
AMORTIZED COST	315.8	817.8
GROSS UNREALIZED GAINS	0.0	0.0
GROSS UNREALIZED LOSSES	20.0	30.2
FAIR VALUE	295.8	787.6
Government Sponsored Agency
Investment Holdings [Line Items]
AMORTIZED COST	11,744.3	11,892.5
GROSS UNREALIZED GAINS	9.0	4.3
GROSS UNREALIZED LOSSES	200.3	351.6
FAIR VALUE	11,553.0	11,545.2
Non-U.S. Government
Investment Holdings [Line Items]
AMORTIZED COST	284.8	387.6
GROSS UNREALIZED GAINS	0.0	0.0
GROSS UNREALIZED LOSSES	20.4	27.6
FAIR VALUE	264.4	360.0
Corporate Debt
Investment Holdings [Line Items]
AMORTIZED COST	287.5	1,774.3
GROSS UNREALIZED GAINS	0.1	0.2
GROSS UNREALIZED LOSSES	8.1	26.9
FAIR VALUE	279.5	1,747.6
Covered Bonds
Investment Holdings [Line Items]
AMORTIZED COST	356.8	403.1
GROSS UNREALIZED GAINS	0.0	0.3
GROSS UNREALIZED LOSSES	9.7	14.7
FAIR VALUE	347.1	388.7
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds
Investment Holdings [Line Items]
AMORTIZED COST	3,013.8	2,645.8
GROSS UNREALIZED GAINS	0.1	0.3
GROSS UNREALIZED LOSSES	114.0	166.7
FAIR VALUE	2,899.9	2,479.4
Other Asset-Backed
Investment Holdings [Line Items]
AMORTIZED COST	3,061.0	5,544.3
GROSS UNREALIZED GAINS	1.6	0.0
GROSS UNREALIZED LOSSES	100.0	288.1
FAIR VALUE	2,962.6	5,256.2
Commercial Mortgage-Backed
Investment Holdings [Line Items]
AMORTIZED COST	913.5	1,456.9
GROSS UNREALIZED GAINS	0.2	0.1
GROSS UNREALIZED LOSSES	48.4	69.2
FAIR VALUE	$ 865.3	$ 1,387.8

XML

Securities (Remaining Maturity of Securities Available for Sale and Held to Maturity) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Available for Sale - Amortized Cost
ONE YEAR OR LESS	$ 3,386.3
ONE TO FIVE YEARS	15,718.3
FIVE TO TEN YEARS	3,840.7
OVER TEN YEARS	713.7
AMORTIZED COST	23,659.0	$ 27,760.0
Available for Sale - Fair Value
ONE YEAR OR LESS	3,343.8
ONE YEAR OR LESS	15,307.0
FIVE TO TEN YEARS	3,752.4
OVER TEN YEARS	686.6
Total	23,089.8	26,699.9
Held to Maturity - Amortized Cost
ONE YEAR OR LESS	6,756.6
ONE TO FIVE YEARS	12,455.8
FIVE TO TEN YEARS	4,798.3
FIVE TO TEN YEARS	2,211.0
Amortized Cost	26,221.7	25,036.1
Held to Maturity - Fair Value
Fair value, one year or less	6,618.0
Fair value, one to five years	11,607.2
Fair value, five to ten years	4,380.7
Fair value, over ten years	1,867.1
FAIR VALUE	24,473.0	22,879.3
U.S. Government
Available for Sale - Amortized Cost
ONE YEAR OR LESS	198.3
ONE TO FIVE YEARS	3,483.2
FIVE TO TEN YEARS	0.0
OVER TEN YEARS	0.0
AMORTIZED COST	3,681.5	2,837.7
Available for Sale - Fair Value
ONE YEAR OR LESS	197.8
ONE YEAR OR LESS	3,424.4
FIVE TO TEN YEARS	0.0
OVER TEN YEARS	0.0
Total	3,622.2	2,747.4
Held to Maturity - Amortized Cost
ONE YEAR OR LESS	0.0
ONE TO FIVE YEARS	0.0
FIVE TO TEN YEARS	0.0
FIVE TO TEN YEARS	0.0
Amortized Cost	0.0	50.0
Held to Maturity - Fair Value
Fair value, one year or less	0.0
Fair value, one to five years	0.0
Fair value, five to ten years	0.0
Fair value, over ten years	0.0
FAIR VALUE	0.0	50.0
Obligations of States and Political Subdivisions
Available for Sale - Amortized Cost
ONE YEAR OR LESS	0.0
ONE TO FIVE YEARS	113.2
FIVE TO TEN YEARS	202.6
OVER TEN YEARS	0.0
AMORTIZED COST	315.8	817.8
Available for Sale - Fair Value
ONE YEAR OR LESS	0.0
ONE YEAR OR LESS	106.8
FIVE TO TEN YEARS	189.0
OVER TEN YEARS	0.0
Total	295.8	787.6
Held to Maturity - Amortized Cost
ONE YEAR OR LESS	45.7
ONE TO FIVE YEARS	1,100.7
FIVE TO TEN YEARS	1,126.3
FIVE TO TEN YEARS	291.2
Amortized Cost	2,563.9	2,565.3
Held to Maturity - Fair Value
Fair value, one year or less	45.3
Fair value, one to five years	1,076.8
Fair value, five to ten years	1,090.8
Fair value, over ten years	279.1
FAIR VALUE	2,492.0	2,415.5
Government Sponsored Agency
Available for Sale - Amortized Cost
ONE YEAR OR LESS	2,384.3
ONE TO FIVE YEARS	5,330.2
FIVE TO TEN YEARS	3,327.0
OVER TEN YEARS	702.8
AMORTIZED COST	11,744.3	11,892.5
Available for Sale - Fair Value
ONE YEAR OR LESS	2,357.0
ONE YEAR OR LESS	5,237.5
FIVE TO TEN YEARS	3,282.8
OVER TEN YEARS	675.7
Total	11,553.0	11,545.2
Held to Maturity - Amortized Cost
ONE YEAR OR LESS	984.3
ONE TO FIVE YEARS	3,381.4
FIVE TO TEN YEARS	3,248.6
FIVE TO TEN YEARS	1,741.0
Amortized Cost	9,355.3	9,407.7
Held to Maturity - Fair Value
Fair value, one year or less	885.4
Fair value, one to five years	3,037.6
Fair value, five to ten years	2,905.4
Fair value, over ten years	1,516.8
FAIR VALUE	8,345.2	8,331.7
Non-U.S. Government
Available for Sale - Amortized Cost
ONE YEAR OR LESS	67.9
ONE TO FIVE YEARS	216.9
FIVE TO TEN YEARS	0.0
OVER TEN YEARS	0.0
AMORTIZED COST	284.8	387.6
Available for Sale - Fair Value
ONE YEAR OR LESS	66.1
ONE YEAR OR LESS	198.3
FIVE TO TEN YEARS	0.0
OVER TEN YEARS	0.0
Total	264.4	360.0
Held to Maturity - Amortized Cost
ONE YEAR OR LESS	3,376.0
ONE TO FIVE YEARS	1,379.3
FIVE TO TEN YEARS	33.8
FIVE TO TEN YEARS	0.0
Amortized Cost	4,789.1
Held to Maturity - Fair Value
Fair value, one year or less	3,374.3
Fair value, one to five years	1,294.7
Fair value, five to ten years	29.6
Fair value, over ten years	0.0
FAIR VALUE	4,698.6
Corporate Debt
Available for Sale - Amortized Cost
ONE YEAR OR LESS	105.2
ONE TO FIVE YEARS	182.3
FIVE TO TEN YEARS	0.0
OVER TEN YEARS	0.0
AMORTIZED COST	287.5	1,774.3
Available for Sale - Fair Value
ONE YEAR OR LESS	103.8
ONE YEAR OR LESS	175.7
FIVE TO TEN YEARS	0.0
OVER TEN YEARS	0.0
Total	279.5	1,747.6
Held to Maturity - Amortized Cost
ONE YEAR OR LESS	276.8
ONE TO FIVE YEARS	353.7
FIVE TO TEN YEARS	15.6
FIVE TO TEN YEARS	0.0
Amortized Cost	646.1	713.3
Held to Maturity - Fair Value
Fair value, one year or less	269.5
Fair value, one to five years	335.2
Fair value, five to ten years	13.2
Fair value, over ten years	0.0
FAIR VALUE	617.9	667.9
Covered Bonds
Available for Sale - Amortized Cost
ONE YEAR OR LESS	90.3
ONE TO FIVE YEARS	266.5
FIVE TO TEN YEARS	0.0
OVER TEN YEARS	0.0
AMORTIZED COST	356.8	403.1
Available for Sale - Fair Value
ONE YEAR OR LESS	89.2
ONE YEAR OR LESS	257.9
FIVE TO TEN YEARS	0.0
OVER TEN YEARS	0.0
Total	347.1	388.7
Held to Maturity - Amortized Cost
ONE YEAR OR LESS	345.4
ONE TO FIVE YEARS	1,623.1
FIVE TO TEN YEARS	240.1
FIVE TO TEN YEARS	0.0
Amortized Cost	2,208.6	2,530.3
Held to Maturity - Fair Value
Fair value, one year or less	342.1
Fair value, one to five years	1,542.5
Fair value, five to ten years	216.0
Fair value, over ten years	0.0
FAIR VALUE	2,100.6	2,371.9
Certificates of Deposit
Held to Maturity - Amortized Cost
ONE YEAR OR LESS	585.1
ONE TO FIVE YEARS	0.0
FIVE TO TEN YEARS	0.0
FIVE TO TEN YEARS	0.0
Amortized Cost	585.1	35.9
Held to Maturity - Fair Value
Fair value, one year or less	584.4
Fair value, one to five years	0.0
Fair value, five to ten years	0.0
Fair value, over ten years	0.0
FAIR VALUE	584.4	35.9
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds
Available for Sale - Amortized Cost
ONE YEAR OR LESS	280.3
ONE TO FIVE YEARS	2,665.8
FIVE TO TEN YEARS	67.7
OVER TEN YEARS	0.0
AMORTIZED COST	3,013.8	2,645.8
Available for Sale - Fair Value
ONE YEAR OR LESS	277.8
ONE YEAR OR LESS	2,567.1
FIVE TO TEN YEARS	55.0
OVER TEN YEARS	0.0
Total	2,899.9	2,479.4
Held to Maturity - Amortized Cost
ONE YEAR OR LESS	1,080.8
ONE TO FIVE YEARS	4,159.0
FIVE TO TEN YEARS	5.7
FIVE TO TEN YEARS	0.0
Amortized Cost	5,245.5	5,703.3
Held to Maturity - Fair Value
Fair value, one year or less	1,055.6
Fair value, one to five years	3,893.6
Fair value, five to ten years	4.6
Fair value, over ten years	0.0
FAIR VALUE	4,953.8	5,268.2
Other Asset-Backed
Available for Sale - Amortized Cost
ONE YEAR OR LESS	218.1
ONE TO FIVE YEARS	2,724.2
FIVE TO TEN YEARS	107.8
OVER TEN YEARS	10.9
AMORTIZED COST	3,061.0	5,544.3
Available for Sale - Fair Value
ONE YEAR OR LESS	212.8
ONE YEAR OR LESS	2,631.1
FIVE TO TEN YEARS	107.8
OVER TEN YEARS	10.9
Total	2,962.6	5,256.2
Held to Maturity - Amortized Cost
ONE YEAR OR LESS	14.7
ONE TO FIVE YEARS	102.0
FIVE TO TEN YEARS	97.5
FIVE TO TEN YEARS	0.0
Amortized Cost	214.2	263.7
Held to Maturity - Fair Value
Fair value, one year or less	14.7
Fair value, one to five years	102.1
Fair value, five to ten years	97.6
Fair value, over ten years	0.0
FAIR VALUE	214.4	262.7
Commercial Mortgage-Backed
Available for Sale - Amortized Cost
ONE YEAR OR LESS	41.9
ONE TO FIVE YEARS	736.0
FIVE TO TEN YEARS	135.6
OVER TEN YEARS	0.0
AMORTIZED COST	913.5	1,456.9
Available for Sale - Fair Value
ONE YEAR OR LESS	39.3
ONE YEAR OR LESS	708.2
FIVE TO TEN YEARS	117.8
OVER TEN YEARS	0.0
Total	865.3	1,387.8
Held to Maturity - Amortized Cost
ONE YEAR OR LESS	0.0
ONE TO FIVE YEARS	37.6
FIVE TO TEN YEARS	0.0
FIVE TO TEN YEARS	0.0
Amortized Cost	37.6
Held to Maturity - Fair Value
Fair value, one year or less	0.0
Fair value, one to five years	36.8
Fair value, five to ten years	0.0
Fair value, over ten years	0.0
FAIR VALUE	36.8
Other
Held to Maturity - Amortized Cost
ONE YEAR OR LESS	47.8
ONE TO FIVE YEARS	319.0
FIVE TO TEN YEARS	30.7
FIVE TO TEN YEARS	178.8
Amortized Cost	576.3	532.6
Held to Maturity - Fair Value
Fair value, one year or less	46.7
Fair value, one to five years	287.9
Fair value, five to ten years	23.5
Fair value, over ten years	71.2
FAIR VALUE	$ 429.3	$ 375.2

XML

Securities (Securities with Unrealized Losses) (Details) $ in Millions	Dec. 31, 2023 USD ($) Security	Dec. 31, 2022 USD ($) Security
FAIR VALUE
Less Than 12 Months, Fair Value	$ 503.0	$ 15,665.4
12 Months or Longer, Fair Value	18,932.3	5,769.4
Total, Fair Value	19,435.3	21,434.8
UNREALIZED LOSSES
Less Than 12 Months, Unrealized Losses	24.1	727.7
12 Months or Longer, Unrealized Losses	544.2	321.5
Total, Unrealized Losses	568.3	1,049.2
Allowance for credit losses, available-for-sale securities	1.2	1.3
U.S. Government
FAIR VALUE
Less Than 12 Months, Fair Value	0.0	1,123.6
12 Months or Longer, Fair Value	3,364.7	343.1
Total, Fair Value	3,364.7	1,466.7
UNREALIZED LOSSES
Less Than 12 Months, Unrealized Losses	0.0	64.1
12 Months or Longer, Unrealized Losses	61.5	28.7
Total, Unrealized Losses	61.5	92.8
Obligations of States and Political Subdivisions
FAIR VALUE
Less Than 12 Months, Fair Value	87.8	160.0
12 Months or Longer, Fair Value	208.0	120.6
Total, Fair Value	295.8	280.6
UNREALIZED LOSSES
Less Than 12 Months, Unrealized Losses	5.9	16.8
12 Months or Longer, Unrealized Losses	14.1	13.4
Total, Unrealized Losses	20.0	30.2
Government Sponsored Agency
FAIR VALUE
Less Than 12 Months, Fair Value	331.0	7,631.4
12 Months or Longer, Fair Value	9,486.6	2,737.7
Total, Fair Value	9,817.6	10,369.1
UNREALIZED LOSSES
Less Than 12 Months, Unrealized Losses	11.5	262.1
12 Months or Longer, Unrealized Losses	188.8	89.5
Total, Unrealized Losses	200.3	351.6
Non-U.S. Government
FAIR VALUE
Less Than 12 Months, Fair Value	0.0	235.4
12 Months or Longer, Fair Value	264.5	124.6
Total, Fair Value	264.5	360.0
UNREALIZED LOSSES
Less Than 12 Months, Unrealized Losses	0.0	17.3
12 Months or Longer, Unrealized Losses	20.4	10.3
Total, Unrealized Losses	20.4	27.6
Corporate Debt
FAIR VALUE
Less Than 12 Months, Fair Value	4.4	427.3
12 Months or Longer, Fair Value	143.0	130.3
Total, Fair Value	147.4	557.6
UNREALIZED LOSSES
Less Than 12 Months, Unrealized Losses	0.1	14.6
12 Months or Longer, Unrealized Losses	2.1	2.8
Total, Unrealized Losses	$ 2.2	$ 17.4
Number of debt securities, available-for-sale | Security	3	3
Debt securities, available-for-sale, continuous unrealized loss position with credit loss	$ 98.4	$ 93.8
Debt securities, available-for-sale, continuous unrealized loss position, accumulated loss, with credit loss	5.9	9.5
Covered Bonds
FAIR VALUE
Less Than 12 Months, Fair Value	0.0	238.0
12 Months or Longer, Fair Value	213.2	42.8
Total, Fair Value	213.2	280.8
UNREALIZED LOSSES
Less Than 12 Months, Unrealized Losses	0.0	13.5
12 Months or Longer, Unrealized Losses	9.7	1.2
Total, Unrealized Losses	9.7	14.7
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds
FAIR VALUE
Less Than 12 Months, Fair Value	0.0	1,305.4
12 Months or Longer, Fair Value	2,477.0	807.1
Total, Fair Value	2,477.0	2,112.5
UNREALIZED LOSSES
Less Than 12 Months, Unrealized Losses	0.0	74.4
12 Months or Longer, Unrealized Losses	105.8	83.2
Total, Unrealized Losses	$ 105.8	$ 157.6
Number of debt securities, available-for-sale | Security	1	1
Debt securities, available-for-sale, continuous unrealized loss position with credit loss	$ 71.0	$ 68.3
Debt securities, available-for-sale, continuous unrealized loss position, accumulated loss, with credit loss	8.2	9.1
Other Asset-Backed
FAIR VALUE
Less Than 12 Months, Fair Value	19.8	3,873.4
12 Months or Longer, Fair Value	1,998.7	1,247.6
Total, Fair Value	2,018.5	5,121.0
UNREALIZED LOSSES
Less Than 12 Months, Unrealized Losses	2.0	217.5
12 Months or Longer, Unrealized Losses	98.0	70.6
Total, Unrealized Losses	100.0	288.1
Commercial Mortgage-Backed
FAIR VALUE
Less Than 12 Months, Fair Value	60.0	670.9
12 Months or Longer, Fair Value	776.6	215.6
Total, Fair Value	836.6	886.5
UNREALIZED LOSSES
Less Than 12 Months, Unrealized Losses	4.6	47.4
12 Months or Longer, Unrealized Losses	43.8	21.8
Total, Unrealized Losses	$ 48.4	$ 69.2

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Securities (Narrative) (Details) $ in Millions	3 Months Ended		11 Months Ended	12 Months Ended
	Dec. 31, 2023 USD ($) investment	Mar. 31, 2023 USD ($)	Nov. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) investment	Dec. 31, 2022 USD ($) investment	Dec. 31, 2021 USD ($)
Debt and Equity Securities, FV-NI [Line Items]
Number of securities in an unrealized loss position | investment	898			898	1,030
Debt securities, available-for-sale, unrealized loss position	$ 19,435.3			$ 19,435.3	$ 21,434.8
Debt securities, available-for-sale, unrealized loss position, accumulated loss	568.3			568.3	1,049.2
Debt securities, available-for-sale, accumulated gross unrealized loss	582.4			582.4	1,067.8
Available for sale	23,089.8			23,089.8	26,699.9
Debt securities, available-for-sale, realized loss			$ (176.4)	180.0	214.0	$ 1.7
Available for sale, amortized cost	23,659.0			23,659.0	27,760.0
Allowance for credit losses, available-for-sale securities	1.2			1.2	1.3
Credit loss, excluding accrued interest, expense (reversal)				24.6	10.7	(81.5)
Debt securities, held-to-maturity, amortized cost	26,221.7			26,221.7	25,036.1
Debt securities, held-to-maturity, accumulated unrecognized Loss	$ 1,755.6			$ 1,755.6	2,158.2
Transferred from available for sale to held to maturity					$ 6,600.0
Percentage of debt securities, held-to-maturity, portfolio	1			1	1
Investment security gains (losses), net	$ 176.4	$ (6.9)		$ 169.5	$ 214.0	0.3
Gross proceeds from sale of securities					$ 138.7	$ 116.7
Moodys And Standard Poors A Or Higher Rating
Debt and Equity Securities, FV-NI [Line Items]
Percentage of debt securities, held-to-maturity, portfolio	0.97			0.97	0.97
Moodys And Standard Poors Not Rated
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, held-to-maturity, amortized cost	$ 560.9			$ 560.9	$ 502.7
Percentage of debt securities, held-to-maturity, portfolio					0.02
Government Sponsored Agency
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, available-for-sale, unrealized loss position	9,817.6			9,817.6	$ 10,369.1
Debt securities, available-for-sale, unrealized loss position, accumulated loss	200.3			200.3	351.6
Debt securities, available-for-sale, accumulated gross unrealized loss	200.3			200.3	351.6
Available for sale	11,553.0			11,553.0	11,545.2
Available for sale, amortized cost	11,744.3			11,744.3	11,892.5
Debt securities, held-to-maturity, amortized cost	9,355.3			9,355.3	9,407.7
Debt securities, held-to-maturity, accumulated unrecognized Loss	1,012.4			1,012.4	1,076.0
Government Sponsored Agency | Moodys And Standard Poors Not Rated
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, held-to-maturity, amortized cost	0.0			0.0	0.0
Corporate Debt
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, available-for-sale, unrealized loss position	147.4			147.4	557.6
Debt securities, available-for-sale, unrealized loss position, accumulated loss	2.2			2.2	17.4
Debt securities, available-for-sale, accumulated gross unrealized loss	8.1			8.1	26.9
Available for sale	279.5			279.5	1,747.6
Available for sale, amortized cost	287.5			287.5	1,774.3
Credit loss, excluding accrued interest, expense (reversal)				(0.1)	1.3
Debt securities, held-to-maturity, amortized cost	646.1			646.1	713.3
Debt securities, held-to-maturity, accumulated unrecognized Loss	28.2			28.2	45.4
Gross proceeds from sale of securities				5,200.0
Corporate Debt | Moodys And Standard Poors Not Rated
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, held-to-maturity, amortized cost	0.0			0.0	0.0
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, available-for-sale, unrealized loss position	2,477.0			2,477.0	2,112.5
Debt securities, available-for-sale, unrealized loss position, accumulated loss	105.8			105.8	157.6
Debt securities, available-for-sale, accumulated gross unrealized loss	114.0			114.0	166.7
Available for sale	2,899.9			2,899.9	2,479.4
Available for sale, amortized cost	3,013.8			3,013.8	2,645.8
Debt securities, held-to-maturity, amortized cost	5,245.5			5,245.5	5,703.3
Debt securities, held-to-maturity, accumulated unrecognized Loss	294.9			294.9	436.1
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds | Moodys And Standard Poors Not Rated
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, held-to-maturity, amortized cost	0.0			0.0	0.0
Covered Bonds
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, available-for-sale, unrealized loss position	213.2			213.2	280.8
Debt securities, available-for-sale, unrealized loss position, accumulated loss	9.7			9.7	14.7
Debt securities, available-for-sale, accumulated gross unrealized loss	9.7			9.7	14.7
Available for sale	347.1			347.1	388.7
Available for sale, amortized cost	356.8			356.8	403.1
Debt securities, held-to-maturity, amortized cost	2,208.6			2,208.6	2,530.3
Debt securities, held-to-maturity, accumulated unrecognized Loss	108.3			108.3	158.7
Covered Bonds | Moodys And Standard Poors Not Rated
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, held-to-maturity, amortized cost	$ 0.0			$ 0.0	0.0
Available For Sale, Debt Securities, Portfolio For Sale
Debt and Equity Securities, FV-NI [Line Items]
Available for sale			3,000.0		2,100.0
Available for sale, amortized cost			$ 3,200.0
Investment security gains (losses), net					$ 213.0

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Securities (Reconciliation of Amortized Cost to Fair Value of Securities Held to Maturity) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 26,221.7	$ 25,036.1
GROSS UNREALIZED GAINS	6.9	1.4
GROSS UNREALIZED LOSSES	1,755.6	2,158.2
FAIR VALUE	24,473.0	22,879.3
U.S. Government
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0	50.0
GROSS UNREALIZED GAINS	0.0	0.0
GROSS UNREALIZED LOSSES	0.0	0.0
FAIR VALUE	0.0	50.0
Obligations of States and Political Subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	2,563.9	2,565.3
GROSS UNREALIZED GAINS	0.5	0.0
GROSS UNREALIZED LOSSES	72.4	149.8
FAIR VALUE	2,492.0	2,415.5
Government Sponsored Agency
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	9,355.3	9,407.7
GROSS UNREALIZED GAINS	2.3	0.0
GROSS UNREALIZED LOSSES	1,012.4	1,076.0
FAIR VALUE	8,345.2	8,331.7
Non-U.S. Government
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	4,789.1	3,234.0
GROSS UNREALIZED GAINS	0.2	0.1
GROSS UNREALIZED LOSSES	90.7	133.8
FAIR VALUE	4,698.6	3,100.3
Corporate Debt
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	646.1	713.3
GROSS UNREALIZED GAINS	0.0	0.0
GROSS UNREALIZED LOSSES	28.2	45.4
FAIR VALUE	617.9	667.9
Covered Bonds
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	2,208.6	2,530.3
GROSS UNREALIZED GAINS	0.3	0.3
GROSS UNREALIZED LOSSES	108.3	158.7
FAIR VALUE	2,100.6	2,371.9
Certificates of Deposit
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	585.1	35.9
GROSS UNREALIZED GAINS	0.0	0.0
GROSS UNREALIZED LOSSES	0.7	0.0
FAIR VALUE	584.4	35.9
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	5,245.5	5,703.3
GROSS UNREALIZED GAINS	3.2	1.0
GROSS UNREALIZED LOSSES	294.9	436.1
FAIR VALUE	4,953.8	5,268.2
Other Asset-Backed
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	214.2	263.7
GROSS UNREALIZED GAINS	0.4	0.0
GROSS UNREALIZED LOSSES	0.2	1.0
FAIR VALUE	214.4	262.7
Commercial Mortgage-Backed
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	37.6
GROSS UNREALIZED GAINS	0.0
GROSS UNREALIZED LOSSES	0.8
FAIR VALUE	36.8
Other
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	576.3	532.6
GROSS UNREALIZED GAINS	0.0	0.0
GROSS UNREALIZED LOSSES	147.0	157.4
FAIR VALUE	$ 429.3	$ 375.2

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Securities (Credit Quality Indicators) (Details) $ in Millions	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 26,221.7	$ 25,036.1
Percentage of debt securities, held-to-maturity, portfolio	1	1
AAA
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 18,234.4	$ 18,179.9
Percentage of debt securities, held-to-maturity, portfolio	0.70	0.73
AA
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 4,257.7	$ 4,372.7
Percentage of debt securities, held-to-maturity, portfolio	0.16	0.17
A
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 2,834.7	$ 1,657.4
Percentage of debt securities, held-to-maturity, portfolio	0.11	0.07
BBB
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 334.0	$ 323.4
Percentage of debt securities, held-to-maturity, portfolio	0.01	0.01
NOT RATED
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 560.9	$ 502.7
Percentage of debt securities, held-to-maturity, portfolio		0.02
U.S. Government
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0	$ 50.0
U.S. Government | AAA
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0	50.0
U.S. Government | AA
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0	0.0
U.S. Government | A
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0	0.0
U.S. Government | BBB
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0	0.0
U.S. Government | NOT RATED
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0	0.0
Obligations of States and Political Subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	2,563.9	2,565.3
Obligations of States and Political Subdivisions | AAA
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	954.7	926.8
Obligations of States and Political Subdivisions | AA
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	1,609.0	1,638.5
Obligations of States and Political Subdivisions | A
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0	0.0
Obligations of States and Political Subdivisions | BBB
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0	0.0
Obligations of States and Political Subdivisions | NOT RATED
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.2	0.0
Government Sponsored Agency
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	9,355.3	9,407.7
Government Sponsored Agency | AAA
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	9,355.3	9,407.7
Government Sponsored Agency | AA
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0	0.0
Government Sponsored Agency | A
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0	0.0
Government Sponsored Agency | BBB
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0	0.0
Government Sponsored Agency | NOT RATED
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0	0.0
Non-U.S. Government
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	4,789.1	3,234.0
Non-U.S. Government | AAA
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	813.3	762.2
Non-U.S. Government | AA
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	1,179.6	926.5
Non-U.S. Government | A
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	2,463.3	1,223.0
Non-U.S. Government | BBB
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	332.9	322.3
Non-U.S. Government | NOT RATED
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0	0.0
Corporate Debt
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	646.1	713.3
Corporate Debt | AAA
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	2.1	2.1
Corporate Debt | AA
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	302.6	305.7
Corporate Debt | A
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	341.4	405.5
Corporate Debt | BBB
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0	0.0
Corporate Debt | NOT RATED
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0	0.0
Covered Bonds
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	2,208.6	2,530.3
Covered Bonds | AAA
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	2,208.6	2,530.3
Covered Bonds | AA
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0	0.0
Covered Bonds | A
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0	0.0
Covered Bonds | BBB
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0	0.0
Covered Bonds | NOT RATED
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0	0.0
Certificates of Deposit
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	585.1	35.9
Certificates of Deposit | AAA
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	545.9	0.0
Certificates of Deposit | AA
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0	0.0
Certificates of Deposit | A
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0	0.0
Certificates of Deposit | BBB
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0	0.0
Certificates of Deposit | NOT RATED
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	39.2	35.9
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	5,245.5	5,703.3
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds | AAA
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	4,047.9	4,171.3
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds | AA
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	1,166.5	1,502.0
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds | A
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	30.0	28.9
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds | BBB
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	1.1	1.1
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds | NOT RATED
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0	0.0
Other Asset-Backed
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	214.2	263.7
Other Asset-Backed | AAA
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	214.2	263.7
Other Asset-Backed | AA
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0	0.0
Other Asset-Backed | A
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0	0.0
Other Asset-Backed | BBB
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0	0.0
Other Asset-Backed | NOT RATED
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0	0.0
Commercial Mortgage-Backed
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	37.6
Commercial Mortgage-Backed | AAA
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	37.6
Commercial Mortgage-Backed | AA
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0
Commercial Mortgage-Backed | A
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0
Commercial Mortgage-Backed | BBB
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0
Commercial Mortgage-Backed | NOT RATED
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0
Other
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	576.3	532.6
Other | AAA
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	54.8	65.8
Other | AA
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0	0.0
Other | A
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0	0.0
Other | BBB
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0.0	0.0
Other | NOT RATED
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 521.5	$ 466.8

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Securities (Investment Security Gains and Losses) (Details) - USD ($) $ in Millions	1 Months Ended	11 Months Ended	12 Months Ended
	Jan. 31, 2023	Nov. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Gross Realized Debt Securities Gains	$ 6.9		$ 10.5	$ 0.0	$ 1.4
Gross Realized Debt Securities Losses		$ 176.4	(180.0)	(214.0)	(1.7)
Investment Security Gains (Losses), net(1)			$ (169.5)	$ (214.0)	$ (0.3)

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Securities (Investment Security Gains and Losses by Security Type) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Held-to-maturity Securities [Line Items]
Investment Security Gains (Losses), net	$ (169.5)	$ (214.0)	$ (0.3)
U.S. Government
Schedule of Held-to-maturity Securities [Line Items]
Investment Security Gains (Losses), net	(29.9)	0.0	0.0
Obligations of States and Political Subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Investment Security Gains (Losses), net	9.8	(95.8)	0.0
Government Sponsored Agency
Schedule of Held-to-maturity Securities [Line Items]
Investment Security Gains (Losses), net	(73.2)	0.0	0.0
Corporate Debt
Schedule of Held-to-maturity Securities [Line Items]
Investment Security Gains (Losses), net	(7.6)	(67.3)	(0.3)
Other Asset-Backed
Schedule of Held-to-maturity Securities [Line Items]
Investment Security Gains (Losses), net	(58.6)	(17.1)	0.0
Commercial Mortgage-Backed
Schedule of Held-to-maturity Securities [Line Items]
Investment Security Gains (Losses), net	(0.9)	(33.8)	0.0
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds
Schedule of Held-to-maturity Securities [Line Items]
Investment Security Gains (Losses), net	$ (9.1)	$ 0.0	$ 0.0

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Loans (Loans and Leases) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases	$ 47,617.0	$ 42,893.3
Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases	5,134.2	4,773.0
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases	25,412.8	21,635.6
Commercial | Commercial and Institutional
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases	11,555.3	12,415.0
Commercial | Commercial and Institutional | Northern Trust Private Equity Funds
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases	4,500.0	5,600.0
Commercial | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases	5,134.2	4,773.0
Commercial | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases	2,778.5	3,131.1
Commercial | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases	5,944.8	1,316.5
Personal
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases	22,204.2	21,257.7
Personal | Private Client
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases	14,360.0	14,119.0
Personal | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases	6,327.1	6,413.5
Personal | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases	428.8	510.0
Personal | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases	$ 1,088.3	$ 215.2

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Loans (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) loan	Dec. 31, 2021 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Draw period for credit line products	10 years
Total loans and leases	$ 47,617.0	$ 42,893.3
Other U.S. loans and non-U.S. loans, short duration advances	8,400.0	2,900.0
Demand deposits	12.1	24.4
Held for Sale	0.0	0.0
Loan processing fee	2.5	11.2
Financing receivable, nonaccrual, interest income	3.4	4.1	$ 4.6
Financing receivable, excluding accrued interest, modified, write-off	2.0
Financing receivable, nonaccrual troubled debt restructuring		35.3
Financing receivable, troubled debt restructuring		39.7
Financing receivable, troubled debt restructuring, commitment to lend		$ 0.2
Financing receivable, troubled debt restructuring, subsequent default, number of contracts | loan		0
Recorded investment		$ 32.8
Unpaid principal balance		33.7
Consumer loans collateralized by residential properties in foreclosure	3.5	1.1
Financial Asset, 30 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	4.7
90 DAYS OR MORE PAST DUE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	16.2
Personal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	22,204.2	21,257.7
Recorded investment		0.6
Unpaid principal balance		0.6
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 25,412.8	21,635.6
Recorded investment		32.2
Unpaid principal balance		33.1
Residential Real Estate | Personal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lower limit of generally required loan to collateral value for residential real estate loans	65.00%
Upper limit of generally required loan to collateral value for residential real estate loans	80.00%
Total loans and leases	$ 6,327.1	6,413.5
Recorded investment		0.2
Unpaid principal balance		0.2
Home Equity Loan | Personal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 228.7	$ 248.6
Loans held by Northern trust	96.00%	98.00%
Commercial and Institutional | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 11,555.3	$ 12,415.0
Recorded investment		0.6
Unpaid principal balance		$ 0.6

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Loans (Credit Quality Indicator At Amortized Cost By Origination Year) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	$ 13,006.4	$ 7,905.6
2022/2021	4,823.9	5,484.1
2021/2020	4,177.6	2,791.4
2020/2019	1,765.4	2,007.3
2019/2018	1,208.7	746.1
PRIOR	2,681.5	3,012.1
REVOLVING LOANS	19,233.5	20,561.7
REVOLVING LOANS CONVERTED TO TERM LOANS	720.0	385.0
TOTAL LOANS	47,617.0	42,893.3
2023, Charge-offs	(2.1)
2022, Charge-offs	(4.4)
2021, Charge-offs	0.0
2020, Charge-offs	0.0
2019, Charge-offs	0.0
Prior, Charge-offs	(1.0)
Revolving Loans, Charge-offs	0.0
Revolving Loans Converted to Term Loans, Charge-offs	0.0
Charge-offs	(7.5)	(6.0)	$ (0.7)
Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL LOANS	5,134.2	4,773.0
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	10,601.2	5,610.6
2022/2021	3,008.8	3,194.9
2021/2020	2,212.4	1,381.6
2020/2019	536.3	1,021.9
2019/2018	590.8	390.1
PRIOR	899.0	1,203.4
REVOLVING LOANS	7,467.6	8,760.2
REVOLVING LOANS CONVERTED TO TERM LOANS	96.7	72.9
TOTAL LOANS	25,412.8	21,635.6
2023, Charge-offs	(1.3)
2022, Charge-offs	(4.4)
2021, Charge-offs	0.0
2020, Charge-offs	0.0
2019, Charge-offs	0.0
Prior, Charge-offs	0.0
Revolving Loans, Charge-offs	0.0
Revolving Loans Converted to Term Loans, Charge-offs	0.0
Charge-offs	(5.7)	(5.3)	(0.3)
Commercial | Commercial and Institutional
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	1,259.1	1,548.2
2022/2021	1,395.0	1,858.6
2021/2020	1,458.6	510.6
2020/2019	228.8	364.1
2019/2018	257.8	197.3
PRIOR	590.3	686.0
REVOLVING LOANS	6,276.9	7,199.6
REVOLVING LOANS CONVERTED TO TERM LOANS	88.8	50.6
TOTAL LOANS	11,555.3	12,415.0
Commercial | Commercial and Institutional | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	443.9	753.3
2022/2021	534.1	1,087.5
2021/2020	668.3	209.8
2020/2019	78.1	159.3
2019/2018	137.2	45.9
PRIOR	409.9	511.3
REVOLVING LOANS	4,909.8	6,032.8
REVOLVING LOANS CONVERTED TO TERM LOANS	15.0	17.7
TOTAL LOANS	7,196.3	8,817.6
Commercial | Commercial and Institutional | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	801.4	744.1
2022/2021	790.9	740.6
2021/2020	729.5	300.8
2020/2019	138.7	191.1
2019/2018	120.5	151.4
PRIOR	178.7	174.7
REVOLVING LOANS	1,332.4	1,102.3
REVOLVING LOANS CONVERTED TO TERM LOANS	72.0	32.9
TOTAL LOANS	4,164.1	3,437.9
Commercial | Commercial and Institutional | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	13.8	50.8
2022/2021	70.0	30.5
2021/2020	60.8	0.0
2020/2019	12.0	13.7
2019/2018	0.1	0.0
PRIOR	1.7	0.0
REVOLVING LOANS	34.7	64.5
REVOLVING LOANS CONVERTED TO TERM LOANS	1.8	0.0
TOTAL LOANS	194.9	159.5
Commercial | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	1,933.2	1,294.9
2022/2021	1,598.7	1,290.1
2021/2020	710.6	761.4
2020/2019	242.3	619.9
2019/2018	298.8	192.8
PRIOR	155.4	296.0
REVOLVING LOANS	187.3	297.4
REVOLVING LOANS CONVERTED TO TERM LOANS	7.9	20.5
TOTAL LOANS	5,134.2	4,773.0
2023, Charge-offs	(0.7)
2022, Charge-offs	(4.4)
2021, Charge-offs	0.0
2020, Charge-offs	0.0
2019, Charge-offs	0.0
Prior, Charge-offs	0.0
Revolving Loans, Charge-offs	0.0
Revolving Loans Converted to Term Loans, Charge-offs	0.0
Charge-offs	(5.1)
Commercial | Commercial Real Estate | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	403.6	318.7
2022/2021	389.9	227.4
2021/2020	159.1	123.6
2020/2019	23.9	123.5
2019/2018	37.8	39.8
PRIOR	44.8	39.1
REVOLVING LOANS	51.0	113.4
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	3.0
TOTAL LOANS	1,110.1	988.5
Commercial | Commercial Real Estate | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	1,513.5	968.5
2022/2021	1,208.8	1,040.0
2021/2020	521.0	637.8
2020/2019	218.4	447.3
2019/2018	252.8	153.0
PRIOR	96.0	256.9
REVOLVING LOANS	136.3	181.5
REVOLVING LOANS CONVERTED TO TERM LOANS	7.9	17.5
TOTAL LOANS	3,954.7	3,702.5
Commercial | Commercial Real Estate | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	16.1	7.7
2022/2021	0.0	22.7
2021/2020	30.5	0.0
2020/2019	0.0	49.1
2019/2018	8.2	0.0
PRIOR	14.6	0.0
REVOLVING LOANS	0.0	2.5
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS	69.4	82.0
Commercial | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	1,464.1	1,451.0
2022/2021	15.1	46.2
2021/2020	43.2	109.6
2020/2019	65.2	37.9
2019/2018	34.2	0.0
PRIOR	153.3	221.4
REVOLVING LOANS	1,003.4	1,263.2
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	1.8
TOTAL LOANS	2,778.5	3,131.1
Commercial | Non-U.S. | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	487.9	991.9
2022/2021	0.0	46.2
2021/2020	43.2	109.6
2020/2019	65.2	14.8
2019/2018	34.2	0.0
PRIOR	3.3	6.5
REVOLVING LOANS	760.0	1,158.3
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS	1,393.8	2,327.3
Commercial | Non-U.S. | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	974.7	459.0
2022/2021	0.8	0.0
2021/2020	0.0	0.0
2020/2019	0.0	0.0
2019/2018	0.0	0.0
PRIOR	150.0	214.9
REVOLVING LOANS	243.4	89.5
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	1.8
TOTAL LOANS	1,368.9	765.2
Commercial | Non-U.S. | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	1.5	0.1
2022/2021	14.3	0.0
2021/2020	0.0	0.0
2020/2019	0.0	23.1
2019/2018	0.0	0.0
PRIOR	0.0	0.0
REVOLVING LOANS	0.0	15.4
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS	15.8	38.6
Commercial | Other
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	5,944.8	1,316.5
2022/2021	0.0	0.0
2021/2020	0.0	0.0
2020/2019	0.0	0.0
2019/2018	0.0	0.0
PRIOR	0.0	0.0
REVOLVING LOANS	0.0	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS	5,944.8	1,316.5
2023, Charge-offs	(0.6)
2022, Charge-offs	0.0
2021, Charge-offs	0.0
2020, Charge-offs	0.0
2019, Charge-offs	0.0
Prior, Charge-offs	0.0
Revolving Loans, Charge-offs	0.0
Revolving Loans Converted to Term Loans, Charge-offs	0.0
Charge-offs	(0.6)
Commercial | Other | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	4,313.2	993.9
2022/2021	0.0	0.0
2021/2020	0.0	0.0
2020/2019	0.0	0.0
2019/2018	0.0	0.0
PRIOR	0.0	0.0
REVOLVING LOANS	0.0	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS	4,313.2	993.9
Commercial | Other | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	1,631.6	322.6
2022/2021	0.0	0.0
2021/2020	0.0	0.0
2020/2019	0.0	0.0
2019/2018	0.0	0.0
PRIOR	0.0	0.0
REVOLVING LOANS	0.0	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS	1,631.6	322.6
Personal
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	2,405.2	2,295.0
2022/2021	1,815.1	2,289.2
2021/2020	1,965.2	1,409.8
2020/2019	1,229.1	985.4
2019/2018	617.9	356.0
PRIOR	1,782.5	1,808.7
REVOLVING LOANS	11,765.9	11,801.5
REVOLVING LOANS CONVERTED TO TERM LOANS	623.3	312.1
TOTAL LOANS	22,204.2	21,257.7
2023, Charge-offs	(0.8)
2022, Charge-offs	0.0
2021, Charge-offs	0.0
2020, Charge-offs	0.0
2019, Charge-offs	0.0
Prior, Charge-offs	(1.0)
Revolving Loans, Charge-offs	0.0
Revolving Loans Converted to Term Loans, Charge-offs	0.0
Charge-offs	(1.8)	(0.7)	$ (0.4)
Personal | Private Client
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	818.4	826.7
2022/2021	629.3	915.0
2021/2020	707.4	243.0
2020/2019	168.4	504.9
2019/2018	167.5	70.7
PRIOR	197.7	178.5
REVOLVING LOANS	11,055.4	11,084.8
REVOLVING LOANS CONVERTED TO TERM LOANS	615.9	295.4
TOTAL LOANS	14,360.0	14,119.0
Personal | Private Client | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	504.7	395.5
2022/2021	140.8	159.9
2021/2020	52.3	50.5
2020/2019	67.5	313.6
2019/2018	8.7	13.4
PRIOR	134.7	18.5
REVOLVING LOANS	5,320.9	5,352.5
REVOLVING LOANS CONVERTED TO TERM LOANS	168.1	28.2
TOTAL LOANS	6,397.7	6,332.1
Personal | Private Client | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	290.1	430.3
2022/2021	488.2	755.1
2021/2020	655.1	192.4
2020/2019	100.9	191.3
2019/2018	158.8	38.7
PRIOR	44.7	160.0
REVOLVING LOANS	5,721.5	5,728.6
REVOLVING LOANS CONVERTED TO TERM LOANS	447.8	267.2
TOTAL LOANS	7,907.1	7,763.6
Personal | Private Client | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	23.6	0.9
2022/2021	0.3	0.0
2021/2020	0.0	0.1
2020/2019	0.0	0.0
2019/2018	0.0	18.6
PRIOR	18.3	0.0
REVOLVING LOANS	13.0	3.7
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS	55.2	23.3
Personal | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	470.3	1,225.9
2022/2021	1,169.8	1,330.2
2021/2020	1,218.0	1,166.8
2020/2019	1,060.7	459.2
2019/2018	434.0	277.5
PRIOR	1,571.3	1,624.9
REVOLVING LOANS	403.0	320.1
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	8.9
TOTAL LOANS	6,327.1	6,413.5
2023, Charge-offs	(0.8)
2022, Charge-offs	0.0
2021, Charge-offs	0.0
2020, Charge-offs	0.0
2019, Charge-offs	0.0
Prior, Charge-offs	(1.0)
Revolving Loans, Charge-offs	0.0
Revolving Loans Converted to Term Loans, Charge-offs	0.0
Charge-offs	(1.8)
Personal | Residential Real Estate | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	278.7	871.6
2022/2021	464.0	666.7
2021/2020	500.6	567.7
2020/2019	373.3	168.1
2019/2018	142.4	102.9
PRIOR	722.4	750.8
REVOLVING LOANS	219.8	128.4
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	7.9
TOTAL LOANS	2,701.2	3,264.1
Personal | Residential Real Estate | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	191.6	354.3
2022/2021	694.9	656.7
2021/2020	717.4	597.6
2020/2019	686.7	290.0
2019/2018	290.0	170.9
PRIOR	805.3	838.2
REVOLVING LOANS	170.3	180.4
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	1.0
TOTAL LOANS	3,556.2	3,089.1
Personal | Residential Real Estate | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	0.0	0.0
2022/2021	10.9	6.8
2021/2020	0.0	1.5
2020/2019	0.7	1.1
2019/2018	1.6	3.7
PRIOR	43.6	35.9
REVOLVING LOANS	12.9	11.3
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS	69.7	60.3
Personal | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	28.2	27.2
2022/2021	16.0	44.0
2021/2020	39.8	0.0
2020/2019	0.0	21.3
2019/2018	16.4	7.8
PRIOR	13.5	5.3
REVOLVING LOANS	307.5	396.6
REVOLVING LOANS CONVERTED TO TERM LOANS	7.4	7.8
TOTAL LOANS	428.8	510.0
Personal | Non-U.S. | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	15.5	3.0
2022/2021	0.0	3.7
2021/2020	0.6	0.0
2020/2019	0.0	0.0
2019/2018	0.0	4.6
PRIOR	4.6	2.3
REVOLVING LOANS	71.4	124.6
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS	92.1	138.2
Personal | Non-U.S. | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	12.7	24.2
2022/2021	16.0	40.3
2021/2020	39.2	0.0
2020/2019	0.0	21.3
2019/2018	16.4	3.2
PRIOR	8.9	2.9
REVOLVING LOANS	236.1	272.0
REVOLVING LOANS CONVERTED TO TERM LOANS	7.4	7.8
TOTAL LOANS	336.7	371.7
Personal | Non-U.S. | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022		0.0
2022/2021		0.0
2021/2020		0.0
2020/2019		0.0
2019/2018		0.0
PRIOR		0.1
REVOLVING LOANS		0.0
REVOLVING LOANS CONVERTED TO TERM LOANS		0.0
TOTAL LOANS		0.1
Personal | Other
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	1,088.3	215.2
2022/2021	0.0	0.0
2021/2020	0.0	0.0
2020/2019	0.0	0.0
2019/2018	0.0	0.0
PRIOR	0.0	0.0
REVOLVING LOANS	0.0	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS	1,088.3	215.2
Personal | Other | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	461.7	190.8
2022/2021	0.0	0.0
2021/2020	0.0	0.0
2020/2019	0.0	0.0
2019/2018	0.0	0.0
PRIOR	0.0	0.0
REVOLVING LOANS	0.0	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS	461.7	190.8
Personal | Other | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2023/2022	626.6	24.4
2022/2021	0.0	0.0
2021/2020	0.0	0.0
2020/2019	0.0	0.0
2019/2018	0.0	0.0
PRIOR	0.0	0.0
REVOLVING LOANS	0.0	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS	$ 626.6	$ 24.4

XML

Loans (Delinquency Status) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	$ 47,553.4	$ 42,847.4
NONACCRUAL	63.6	45.9
TOTAL LOANS	47,617.0	42,893.3
NONACCRUAL WITH NO ALLOWANCE	49.4	28.9
Other Real Estate Owned	1.5	0.0
Total Nonaccrual Assets	65.1	45.9
Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL LOANS	5,134.2	4,773.0
CURRENT
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	47,261.1	42,504.6
30 – 59 DAYS PAST DUE
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	239.5	243.4
60 – 89 DAYS PAST DUE
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	32.7	45.2
90 DAYS OR MORE PAST DUE
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	20.1	54.2
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	25,396.5	21,608.0
NONACCRUAL	16.3	27.6
TOTAL LOANS	25,412.8	21,635.6
NONACCRUAL WITH NO ALLOWANCE	4.1	10.6
Commercial | Commercial and Institutional
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	11,539.0	12,397.6
NONACCRUAL	16.3	17.4
TOTAL LOANS	11,555.3	12,415.0
NONACCRUAL WITH NO ALLOWANCE	4.1	4.4
Commercial | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	5,134.2	4,762.8
NONACCRUAL	0.0	10.2
TOTAL LOANS	5,134.2	4,773.0
NONACCRUAL WITH NO ALLOWANCE	0.0	6.2
Commercial | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	2,778.5	3,131.1
NONACCRUAL	0.0	0.0
TOTAL LOANS	2,778.5	3,131.1
NONACCRUAL WITH NO ALLOWANCE	0.0	0.0
Commercial | Other
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	5,944.8	1,316.5
NONACCRUAL	0.0	0.0
TOTAL LOANS	5,944.8	1,316.5
NONACCRUAL WITH NO ALLOWANCE	0.0	0.0
Commercial | CURRENT
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	25,221.6	21,562.8
Commercial | CURRENT | Commercial and Institutional
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	11,374.6	12,353.7
Commercial | CURRENT | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	5,123.7	4,761.5
Commercial | CURRENT | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	2,778.5	3,131.1
Commercial | CURRENT | Other
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	5,944.8	1,316.5
Commercial | 30 – 59 DAYS PAST DUE
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	168.1	41.5
Commercial | 30 – 59 DAYS PAST DUE | Commercial and Institutional
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	163.7	40.2
Commercial | 30 – 59 DAYS PAST DUE | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	4.4	1.3
Commercial | 30 – 59 DAYS PAST DUE | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	0.0	0.0
Commercial | 30 – 59 DAYS PAST DUE | Other
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	0.0	0.0
Commercial | 60 – 89 DAYS PAST DUE
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	6.8	3.0
Commercial | 60 – 89 DAYS PAST DUE | Commercial and Institutional
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	0.7	3.0
Commercial | 60 – 89 DAYS PAST DUE | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	6.1	0.0
Commercial | 60 – 89 DAYS PAST DUE | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	0.0	0.0
Commercial | 60 – 89 DAYS PAST DUE | Other
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	0.0	0.0
Commercial | 90 DAYS OR MORE PAST DUE
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	0.0	0.7
Commercial | 90 DAYS OR MORE PAST DUE | Commercial and Institutional
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	0.0	0.7
Commercial | 90 DAYS OR MORE PAST DUE | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	0.0	0.0
Commercial | 90 DAYS OR MORE PAST DUE | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	0.0	0.0
Commercial | 90 DAYS OR MORE PAST DUE | Other
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	0.0	0.0
Personal
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	22,156.9	21,239.4
NONACCRUAL	47.3	18.3
TOTAL LOANS	22,204.2	21,257.7
NONACCRUAL WITH NO ALLOWANCE	45.3	18.3
Personal | Private Client
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	14,339.7	14,119.0
NONACCRUAL	20.3	0.0
TOTAL LOANS	14,360.0	14,119.0
NONACCRUAL WITH NO ALLOWANCE	18.3	0.0
Personal | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	6,300.1	6,395.2
NONACCRUAL	27.0	18.3
TOTAL LOANS	6,327.1	6,413.5
NONACCRUAL WITH NO ALLOWANCE	27.0	18.3
Personal | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	428.8	510.0
NONACCRUAL	0.0	0.0
TOTAL LOANS	428.8	510.0
NONACCRUAL WITH NO ALLOWANCE	0.0	0.0
Personal | Other
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	1,088.3	215.2
NONACCRUAL	0.0	0.0
TOTAL LOANS	1,088.3	215.2
NONACCRUAL WITH NO ALLOWANCE	0.0	0.0
Personal | CURRENT
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	22,039.5	20,941.8
Personal | CURRENT | Private Client
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	14,240.0	13,843.5
Personal | CURRENT | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	6,283.0	6,373.2
Personal | CURRENT | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	428.2	509.9
Personal | CURRENT | Other
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	1,088.3	215.2
Personal | 30 – 59 DAYS PAST DUE
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	71.4	201.9
Personal | 30 – 59 DAYS PAST DUE | Private Client
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	63.9	192.3
Personal | 30 – 59 DAYS PAST DUE | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	7.5	9.6
Personal | 30 – 59 DAYS PAST DUE | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	0.0	0.0
Personal | 30 – 59 DAYS PAST DUE | Other
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	0.0	0.0
Personal | 60 – 89 DAYS PAST DUE
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	25.9	42.2
Personal | 60 – 89 DAYS PAST DUE | Private Client
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	24.8	29.9
Personal | 60 – 89 DAYS PAST DUE | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	0.5	12.3
Personal | 60 – 89 DAYS PAST DUE | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	0.6	0.0
Personal | 60 – 89 DAYS PAST DUE | Other
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	0.0	0.0
Personal | 90 DAYS OR MORE PAST DUE
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	20.1	53.5
Personal | 90 DAYS OR MORE PAST DUE | Private Client
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	11.0	53.3
Personal | 90 DAYS OR MORE PAST DUE | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	9.1	0.1
Personal | 90 DAYS OR MORE PAST DUE | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	0.0	0.1
Personal | 90 DAYS OR MORE PAST DUE | Other
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL ACCRUAL	$ 0.0	$ 0.0

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Loans (Loan Modifications Made To Borrowers Experiencing Financial Difficulty) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
AMORTIZED COST BASIS	$ 40.7
% OF TOTAL SEGMENT	0.09%
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
AMORTIZED COST BASIS	$ 16.7
% OF TOTAL SEGMENT	0.07%
Commercial | Commercial and Institutional | Term extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
AMORTIZED COST BASIS	$ 16.7
% OF TOTAL SEGMENT	0.14%
Financing receivable, modified, weighted average term increase from modification	12 months
Commercial | Commercial Real Estate | Combination of principal and/or interest deferral and term extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
AMORTIZED COST BASIS	$ 0.0
% OF TOTAL SEGMENT	0.00%
Commercial | Commercial Real Estate | Principal and/or interest deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
AMORTIZED COST BASIS	$ 0.0
% OF TOTAL SEGMENT	0.00%
Financing receivable, excluding accrued interest, modified, deferred interest and principal	$ 32.5
Financing receivable, modified, weighted average term increase from modification	6 months
Commercial | Commercial Real Estate | Term extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, weighted average term increase from modification	6 months
Personal
Financing Receivable, Troubled Debt Restructuring [Line Items]
AMORTIZED COST BASIS	$ 24.0
% OF TOTAL SEGMENT	0.11%
Personal | Residential Real Estate | Combination of principal and/or interest deferral and term extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
AMORTIZED COST BASIS	$ 4.7
% OF TOTAL SEGMENT	0.07%
Personal | Residential Real Estate | Principal and/or interest deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
AMORTIZED COST BASIS	$ 1.0
% OF TOTAL SEGMENT	0.02%
Financing receivable, modified, weighted average term increase from modification	14 months
Personal | Residential Real Estate | Term extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, weighted average term increase from modification	9 months
Personal | Residential Real Estate | Interest rate concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
AMORTIZED COST BASIS	$ 0.0
% OF TOTAL SEGMENT	0.00%
Financing receivable, modified, weighted average interest rate decrease from modification	2.00%
Personal | Private Client | Principal and/or interest deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
AMORTIZED COST BASIS	$ 18.3
% OF TOTAL SEGMENT	0.13%
Financing receivable, excluding accrued interest, modified, deferred interest and principal	$ 18.9
Personal | Private Client | Term extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
AMORTIZED COST BASIS	$ 0.0
% OF TOTAL SEGMENT	0.00%
Financing receivable, modified, weighted average term increase from modification	60 months

XML

Loans (Troubled Debt Restructurings) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS | contract	7
RECORDED INVESTMENT	$ 32.8
UNPAID PRINCIPAL BALANCE	$ 33.7
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS | contract	3
RECORDED INVESTMENT	$ 32.2
UNPAID PRINCIPAL BALANCE	$ 33.1
Commercial | Commercial and Institutional
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS | contract	2
RECORDED INVESTMENT	$ 0.6
UNPAID PRINCIPAL BALANCE	$ 0.6
Commercial | Commercial Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS | contract	1
RECORDED INVESTMENT	$ 31.6
UNPAID PRINCIPAL BALANCE	$ 32.5
Personal
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS | contract	4
RECORDED INVESTMENT	$ 0.6
UNPAID PRINCIPAL BALANCE	$ 0.6
Personal | Residential Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS | contract	3
RECORDED INVESTMENT	$ 0.2
UNPAID PRINCIPAL BALANCE	$ 0.2
Personal | Private Client
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS | contract	1
RECORDED INVESTMENT	$ 0.4
UNPAID PRINCIPAL BALANCE	$ 0.4

XML

Allowance for Credit Losses (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Credit loss, excluding accrued interest, expense (reversal)	$ 24.6	$ 10.7	$ (81.5)
Credit loss expense (reversal) and available-for-sale, allowance for credit loss	24.5	12.0	(81.5)
Financing receivable, excluding accrued interest, allowance for credit loss, writeoff (recovery)	3.8	(4.2)	(6.3)
Other financial assets, allowance for credit loss, excluding accrued interest	0.9	0.8	$ 1.0	$ 0.8
Corporate Debt
Financing Receivable, Allowance for Credit Loss [Line Items]
Credit loss, excluding accrued interest, expense (reversal)	$ (0.1)	$ 1.3

XML

Allowance for Credit Losses (Changes in Allowance for Credit Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
LOANS
Balance at Beginning of Period	$ 144.3	$ 138.4	$ 190.7
Charge-Offs	(7.5)	(6.0)	(0.7)
Recoveries	3.7	10.2	7.0
Net Recoveries (Charge-Offs)	(3.8)	4.2	6.3
Provision for (Release of) Credit Losses	38.2	1.7	(58.6)
Balance at End of Period	178.7	144.3	138.4
UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
Balance at Beginning of Period	38.5	34.1	61.1
Charge-Offs	0.0	0.0	0.0
Recoveries	0.0	0.0	0.0
Net Recoveries (Charge-Offs)	0.0	0.0	0.0
Provision for (Release of) Credit Losses	(11.6)	4.4	(27.0)
Balance at End of Period	26.9	38.5	34.1
HELD TO MATURITY DEBT SECURITIES
Balance at Beginning of Period	16.0	11.2	7.3
Charge-Offs	(1.2)	0.0	0.0
Recoveries	0.0	0.0	0.0
Net Recoveries (Charge-Offs)	(1.2)	0.0	0.0
Provision for (Release of) Credit Losses	(2.1)	4.8	3.9
Balance at End of Period	12.7	16.0	11.2
OTHER FINANCIAL ASSETS
Balance at Beginning of Period	0.8	1.0	0.8
Charge-Offs	0.0	0.0	0.0
Recoveries	0.0	0.0	0.0
Net Recoveries (Charge-Offs)	0.0	0.0	0.0
Provision for (Release of) Credit Losses	0.1	(0.2)	0.2
Balance at End of Period	0.9	0.8	1.0
TOTAL
Balance at Beginning of Period	199.6	184.7	259.9
Charge-Offs	(8.7)	(6.0)	(0.7)
Recoveries	3.7	10.2	7.0
Net Recoveries (Charge-Offs)	(5.0)	4.2	6.3
Provision for (Release of) Credit Losses	24.6	10.7	(81.5)
Balance at End of Period	219.2	199.6	184.7
Corporate Debt
HELD TO MATURITY DEBT SECURITIES
Balance at Beginning of Period	1.9	1.4	0.8
Charge-Offs	0.0
Recoveries	0.0
Provision for (Release of) Credit Losses	(1.0)	0.5	0.6
Balance at End of Period	0.9	1.9	$ 1.4
TOTAL
Provision for (Release of) Credit Losses	$ (0.1)	$ 1.3

XML

Allowance for Credit Losses (Changes in Allowance for Credit Losses Related to Loans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
LOANS
Balance at Beginning of Period	$ 144.3	$ 138.4	$ 190.7
Charge-Offs	7.5	6.0	0.7
Recoveries	3.7	10.2	7.0
Net Recoveries (Charge-Offs)	(3.8)	4.2	6.3
Provision for (Release of) Credit Losses	38.2	1.7	(58.6)
Balance at End of Period	178.7	144.3	138.4
UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
Balance at Beginning of Period	38.5	34.1	61.1
Charge-Offs	0.0	0.0	0.0
Recoveries	0.0	0.0	0.0
Net Recoveries (Charge-Offs)	0.0	0.0	0.0
Provision for (Release of) Credit Losses	(11.6)	4.4	(27.0)
Balance at End of Period	26.9	38.5	34.1
Commercial
LOANS
Balance at Beginning of Period	116.2	105.6	142.2
Charge-Offs	5.7	5.3	0.3
Recoveries	0.2	2.7	0.9
Net Recoveries (Charge-Offs)	(5.5)	(2.6)	0.6
Provision for (Release of) Credit Losses	36.1	13.2	(37.2)
Balance at End of Period	146.8	116.2	105.6
UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
Balance at Beginning of Period	36.3	31.4	57.6
Charge-Offs	0.0	0.0	0.0
Recoveries	0.0	0.0	0.0
Net Recoveries (Charge-Offs)	0.0	0.0	0.0
Provision for (Release of) Credit Losses	(11.4)	4.9	(26.2)
Balance at End of Period	24.9	36.3	31.4
PERSONAL
LOANS
Balance at Beginning of Period	28.1	32.8	48.5
Charge-Offs	1.8	0.7	0.4
Recoveries	3.5	7.5	6.1
Net Recoveries (Charge-Offs)	1.7	6.8	5.7
Provision for (Release of) Credit Losses	2.1	(11.5)	(21.4)
Balance at End of Period	31.9	28.1	32.8
UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
Balance at Beginning of Period	2.2	2.7	3.5
Charge-Offs	0.0	0.0	0.0
Recoveries	0.0	0.0	0.0
Net Recoveries (Charge-Offs)	0.0	0.0	0.0
Provision for (Release of) Credit Losses	(0.2)	(0.5)	(0.8)
Balance at End of Period	$ 2.0	$ 2.2	$ 2.7

XML

Allowance for Credit Losses (Recorded Investments in Loans) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Loans
Evaluated on an Individual Basis	$ 96.3	$ 109.1
Evaluated on a Collective Basis	47,520.7	42,784.2
TOTAL LOANS	47,617.0	42,893.3
Allowance for Credit Losses on Loans
Evaluated on an Individual Basis	13.4	10.4
Evaluated on a Collective Basis	165.3	133.9
Allowance Assigned to Loans	178.7	144.3	$ 138.4	$ 190.7
Allowance for Undrawn Loan Commitments and Standby Letters of Credit
Evaluated on an Individual Basis	0.0	0.0
Evaluated on a Collective Basis	26.9	38.5
Allowance Assigned to Undrawn Loan Commitments and Standby Letters of Credit	26.9	38.5	34.1	61.1
Total Allowance Assigned to Loans and Undrawn Loan Commitments and Standby Letters of Credit	205.6	182.8
Commercial
Loans
Evaluated on an Individual Basis	33.7	63.0
Evaluated on a Collective Basis	25,379.1	21,572.6
TOTAL LOANS	25,412.8	21,635.6
Allowance for Credit Losses on Loans
Evaluated on an Individual Basis	11.4	10.4
Evaluated on a Collective Basis	135.4	105.8
Allowance Assigned to Loans	146.8	116.2	105.6	142.2
Allowance for Undrawn Loan Commitments and Standby Letters of Credit
Evaluated on an Individual Basis	0.0	0.0
Evaluated on a Collective Basis	24.9	36.3
Allowance Assigned to Undrawn Loan Commitments and Standby Letters of Credit	24.9	36.3	31.4	57.6
Total Allowance Assigned to Loans and Undrawn Loan Commitments and Standby Letters of Credit	171.7	152.5
PERSONAL
Loans
Evaluated on an Individual Basis	62.6	46.1
Evaluated on a Collective Basis	22,141.6	21,211.6
TOTAL LOANS	22,204.2	21,257.7
Allowance for Credit Losses on Loans
Evaluated on an Individual Basis	2.0	0.0
Evaluated on a Collective Basis	29.9	28.1
Allowance Assigned to Loans	31.9	28.1	32.8	48.5
Allowance for Undrawn Loan Commitments and Standby Letters of Credit
Evaluated on an Individual Basis	0.0	0.0
Evaluated on a Collective Basis	2.0	2.2
Allowance Assigned to Undrawn Loan Commitments and Standby Letters of Credit	2.0	2.2	$ 2.7	$ 3.5
Total Allowance Assigned to Loans and Undrawn Loan Commitments and Standby Letters of Credit	$ 33.9	$ 30.3

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Allowance for Credit Losses (Changes in The Allowance for Credit Losses Related to Debt Securities Held to Maturity) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
HELD TO MATURITY DEBT SECURITIES
Balance at Beginning of Period	$ 16.0	$ 11.2	$ 7.3
Charge-Offs	(1.2)	0.0	0.0
Recoveries	0.0	0.0	0.0
Net Recoveries (Charge-Offs)	(1.2)
Provision for (Release of) Credit Losses	(2.1)	4.8	3.9
Balance at End of Period	12.7	16.0	11.2
CORPORATE DEBT
HELD TO MATURITY DEBT SECURITIES
Balance at Beginning of Period	1.9	1.4	0.8
Charge-Offs	0.0
Recoveries	0.0
Net Recoveries (Charge-Offs)	0.0
Provision for (Release of) Credit Losses	(1.0)	0.5	0.6
Balance at End of Period	0.9	1.9	1.4
Foreign Corporate Bonds
HELD TO MATURITY DEBT SECURITIES
Balance at Beginning of Period	3.6	1.9	0.2
Charge-Offs	0.0
Recoveries	0.0
Net Recoveries (Charge-Offs)	0.0
Provision for (Release of) Credit Losses	(0.1)	1.7	1.7
Balance at End of Period	3.5	3.6	1.9
SUB-SOVEREIGN, SUPRANATIONAL, AND NON-U.S. AGENCY BONDS
HELD TO MATURITY DEBT SECURITIES
Balance at Beginning of Period	4.0	3.0	1.2
Charge-Offs	0.0
Recoveries	0.0
Net Recoveries (Charge-Offs)	0.0
Provision for (Release of) Credit Losses	(1.8)	1.0	1.8
Balance at End of Period	2.2	4.0	3.0
Obligations of States and Political Subdivisions
HELD TO MATURITY DEBT SECURITIES
Balance at Beginning of Period	1.5	0.0	0.0
Charge-Offs	0.0
Recoveries	0.0
Net Recoveries (Charge-Offs)	0.0
Provision for (Release of) Credit Losses	(0.3)	1.5	0.0
Balance at End of Period	1.2	1.5	0.0
COVERED BONDS
HELD TO MATURITY DEBT SECURITIES
Balance at Beginning of Period	0.1	0.1	0.1
Charge-Offs	0.0
Recoveries	0.0
Net Recoveries (Charge-Offs)	0.0
Provision for (Release of) Credit Losses	0.0	0.0	0.0
Balance at End of Period	0.1	0.1	0.1
OTHER
HELD TO MATURITY DEBT SECURITIES
Balance at Beginning of Period	4.9	4.8	5.0
Charge-Offs	(1.2)
Recoveries	0.0
Net Recoveries (Charge-Offs)	(1.2)
Provision for (Release of) Credit Losses	1.1	0.1	(0.2)
Balance at End of Period	$ 4.8	$ 4.9	$ 4.8

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Allowance for Credit Losses (Accrued Interest) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Receivables [Abstract]
Loans	$ 241.7	$ 203.1
Debt Securities
Held to Maturity	72.0	63.2
Available for Sale	129.2	147.1
Other Financial Assets	86.0	43.8
Interest Receivable	$ 528.9	$ 457.2
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Other Assets	Other Assets
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Other Assets	Other Assets
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Other Assets	Other Assets

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Concentrations of Credit Risk - Narrative (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Concentration Risk [Line Items]
Interest bearing balances held at banks	$ 1,900.0	$ 1,900.0
Credit risk to banks	4,700.0	4,600.0
Federal funds sold and securities purchased under agreements to resell	800.0
Securities purchased under agreements to resell	784.7	1,070.3
Residential real estate	$ 6,327.1	$ 6,413.5
Residential real estate loans as percentage of total U.S. loans	14.00%	16.00%
Residential Real Estate
Concentration Risk [Line Items]
Legally binding undrawn commitments to extend credit	$ 804.2	$ 783.4
Residential Real Estate | Personal
Concentration Risk [Line Items]
Lower limit of generally required loan to collateral value for residential real estate loans	65.00%
Upper limit of generally required loan to collateral value for residential real estate loans	80.00%
Commercial Real Estate | Letter of Credit
Concentration Risk [Line Items]
Legally binding undrawn commitments to extend credit	$ 413.0	449.3
Commercial Real Estate | Standby Letters of Credit
Concentration Risk [Line Items]
Legally binding undrawn commitments to extend credit	$ 82.1	$ 69.7

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Concentrations of Credit Risk (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Concentration Risk [Line Items]
Total Residential Real Estate	$ 6,327.1	$ 6,413.5
Florida
Concentration Risk [Line Items]
Total Residential Real Estate	1,648.1	1,603.2
California
Concentration Risk [Line Items]
Total Residential Real Estate	1,463.8	1,508.1
Illinois
Concentration Risk [Line Items]
Total Residential Real Estate	640.3	686.9
New York
Concentration Risk [Line Items]
Total Residential Real Estate	505.4	498.7
Colorado
Concentration Risk [Line Items]
Total Residential Real Estate	344.1	364.2
Texas
Concentration Risk [Line Items]
Total Residential Real Estate	318.7	312.4
All other
Concentration Risk [Line Items]
Total Residential Real Estate	$ 1,406.7	$ 1,440.0

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Concentrations of Credit Risk - Commercial Real Estate Loans (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Commercial Mortgages
TOTAL LOANS	$ 47,617.0	$ 42,893.3
Mortgages
Commercial Mortgages
Office	1,035.1	1,054.0
Apartment/ Multi-family	1,633.9	1,392.7
Retail	620.9	572.2
Industrial/ Warehouse	687.1	596.2
Other	575.3	548.0
TOTAL LOANS	4,552.3	4,163.1
Commercial Real Estate
Commercial Mortgages
TOTAL LOANS	5,134.2	4,773.0
Construction, Acquisition and Development Loans	$ 581.9	$ 609.9

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Buildings and Equipment (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
ORIGINAL COST	$ 1,331.1	$ 1,250.0
ACCUMULATED DEPRECIATION	828.9	749.5
NET BOOK VALUE	502.2	500.5
Land and Improvements
Property, Plant and Equipment [Line Items]
ORIGINAL COST	11.5	11.5
ACCUMULATED DEPRECIATION	0.3	0.3
NET BOOK VALUE	11.2	11.2
Buildings
Property, Plant and Equipment [Line Items]
ORIGINAL COST	253.1	224.7
ACCUMULATED DEPRECIATION	141.4	137.7
NET BOOK VALUE	111.7	87.0
Equipment
Property, Plant and Equipment [Line Items]
ORIGINAL COST	536.5	499.7
ACCUMULATED DEPRECIATION	337.5	281.9
NET BOOK VALUE	199.0	217.8
Leasehold Improvements
Property, Plant and Equipment [Line Items]
ORIGINAL COST	530.0	514.1
ACCUMULATED DEPRECIATION	349.7	329.6
NET BOOK VALUE	$ 180.3	$ 184.5

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Buildings and Equipment - Narrative (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Abstract]
Depreciation of assets	$ 115.9	$ 110.1	$ 110.8

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Lease Commitments - Lease Cost Components (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Operating Lease Cost	$ 109.2	$ 104.5
Variable Lease, Cost	54.7	82.2
Sublease Income	(2.7)	(2.9)
Total Lease Cost	$ 161.2	$ 183.8

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Lease Commitments - Maturity of Lease Liability (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
2024	$ 93.2
2025	100.3
2026	85.5
2027	84.9
2028	72.8
Later Years	393.5
Total Lease Payments	830.2
Less: Imputed Interest	(137.4)
Present Value of Lease Liabilities	$ 692.8	$ 626.2

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Lease Commitments - Narrative (Detail)	Dec. 31, 2023 USD ($)
Leases [Abstract]
Lessee, operating lease, lease not yet commenced, liability	$ 0

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Lease Commitments - Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Assets
Operating Lease Right-of-Use Asset	$ 522.8	$ 484.8
Liabilities
Operating Lease Liability	$ 692.8	$ 626.2
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other Assets	Other Assets
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Other Liabilities	Other Liabilities

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Lease Commitments - Weighted-Average Remaining Lease Term and Discount Rate (Detail)	Dec. 31, 2023	Dec. 31, 2022
Operating Leases
Weighted-Average Remaining Lease Term	10 years 1 month 6 days	9 years 3 months 18 days
Weighted-Average Discount Rate	3.30%	3.00%

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Lease Commitments - Supplemental Cash Flow Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid for amounts included in the measurement of lease liabilities - operating cash flows	$ 91.4	$ 70.3
Supplemental non-cash information
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 122.6	$ 61.0

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Goodwill and Other Intangibles - Goodwill (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Beginning Balance	$ 691.3	$ 706.2
Foreign Exchange Rates	11.0	(14.9)
Ending Balance	702.3	691.3
ASSET SERVICING
Goodwill [Roll Forward]
Beginning Balance	611.0	625.7
Foreign Exchange Rates	10.9	(14.7)
Ending Balance	621.9	611.0
WEALTH MANAGEMENT
Goodwill [Roll Forward]
Beginning Balance	80.3	80.5
Foreign Exchange Rates	0.1	(0.2)
Ending Balance	$ 80.4	$ 80.3

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Goodwill and Other Intangibles - Other Intangible Assets and Capitalized Software (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Other Intangible Assets
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 135.0	$ 197.9
Less: Accumulated Amortization	63.4	120.3
Net Book Value	71.6	77.6
Computer Software
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,781.7	3,479.3
Less: Accumulated Amortization	1,754.2	1,517.4
Net Book Value	$ 2,027.5	$ 1,961.9

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Goodwill and Other Intangibles - Narrative (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other Intangible Assets
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 9.3	$ 9.3	$ 14.8
Estimated future amortization expense for 2024	9.5
Estimated future amortization expense for 2025	8.9
Estimated future amortization expense for 2026	8.5
Estimated future amortization expense for 2027	8.3
Estimated future amortization expense for 2028	7.7
Computer Software
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 509.4	$ 434.2	$ 390.1

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Deposits - Scheduled Maturity of Total Time Deposits (Details) $ in Millions	Dec. 31, 2023 USD ($)
Time Deposits [Line Items]
1 Year or Less	$ 5,974.1
Over 1 Year to 2 Years	39.3
Over 2 Years to 3 Years	6.7
Over 3 Years to 4 Years	2.1
Over 4 Years to 5 Years	9.9
Over 5 Years	0.0
Total	6,032.1
U.S. OFFICE
Time Deposits [Line Items]
1 Year or Less	3,394.0
Over 1 Year to 2 Years	39.3
Over 2 Years to 3 Years	6.7
Over 3 Years to 4 Years	2.1
Over 4 Years to 5 Years	9.9
Over 5 Years	0.0
Total	3,452.0
NON-U.S. OFFICES
Time Deposits [Line Items]
1 Year or Less	2,580.1
Over 1 Year to 2 Years	0.0
Over 2 Years to 3 Years	0.0
Over 3 Years to 4 Years	0.0
Over 4 Years to 5 Years	0.0
Over 5 Years	0.0
Total	$ 2,580.1

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Deposits - Narrative (Details) $ in Millions	Dec. 31, 2022 USD ($)
Banking And Thrift, Time Deposits [Abstract]
Time Deposits, at or Above FDIC Insurance Limit	$ 3,721.8
Time deposits, certificates of deposits	1,697.6
Time deposits, non-U.S	$ 2,024.2

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Senior Notes and Long-Term Debt - Senior Notes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Senior Notes	$ 2,773.2	$ 2,724.2
Fixed Rate Due May 2027
Debt Instrument [Line Items]
Interest rate	4.00%
Senior Notes	$ 997.6	995.0
Fixed Rate Due Aug. 2028
Debt Instrument [Line Items]
Interest rate	3.65%
Senior Notes	$ 483.3	476.6
Fixed Rate Due May. 2029
Debt Instrument [Line Items]
Interest rate	3.15%
Senior Notes	$ 469.1	460.3
Fixed Rate Due May. 2030
Debt Instrument [Line Items]
Interest rate	1.95%
Senior Notes	$ 823.2	792.3
Senior Notes | Interest Rate Swaps
Debt Instrument [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge	$ (219.1)	$ (264.7)

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Senior Notes and Long-Term Debt - Long-Term Debt (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Long-Term Debt	$ 2,065.0	$ 2,066.2
Federal Home Loan Bank (FHLB) Advances	2,000.0	0.0
Long-Term Debt	4,065.0	2,066.2
Long-Term Debt Qualifying as Risk-Based Capital	$ 1,490.8	1,648.5
Redemption price, percentage	100.00%
Corporation-Subordinated 3.95% Notes due Oct. 2025
Debt Instrument [Line Items]
Interest rate	3.95%
Long-Term Debt	$ 720.3	720.1
Corporation Subordinated 3.375% Notes due May 2032
Debt Instrument [Line Items]
Interest rate	3.375%
Long-Term Debt	$ 349.7	349.7
Debt instrument, basis spread on variable rate	1.131%
Corporation Subordinated Notes 6.125% Due November 2032
Debt Instrument [Line Items]
Interest rate	6.125%
Long-Term Debt	$ 995.0	996.4
FHLB Fixed Rate Advance due December 2025
Debt Instrument [Line Items]
Interest rate	5.13%
Federal Home Loan Bank (FHLB) Advances	$ 30.0	0.0
FHLB Fixed Rate Advance due December 2025
Debt Instrument [Line Items]
Interest rate	5.18%
Federal Home Loan Bank (FHLB) Advances	$ 570.0	0.0
FHLB Fixed Rate Advance due March 2026
Debt Instrument [Line Items]
Interest rate	5.13%
Federal Home Loan Bank (FHLB) Advances	$ 600.0	0.0
FHLB Fixed Rate Advance due June 2026
Debt Instrument [Line Items]
Interest rate	5.09%
Federal Home Loan Bank (FHLB) Advances	$ 800.0	0.0
Subordinated Debt | Interest Rate Swaps
Debt Instrument [Line Items]
Increases in the carrying values of notes outstanding covered by interest-rate swap contracts	$ 0.0	$ (29.3)

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Stockholders' Equity - Narrative (Detail) - USD ($)		12 Months Ended
	Oct. 17, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Oct. 31, 2021
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)		10,000,000	10,000,000
Number of shares authorized to be repurchased (in shares)					25,000,000
Share-based payment arrangement, shares withheld for tax withholding obligation		378,130
Treasury stock, shares, acquired (in shares)		4,384,678	311,536	2,527,544
Treasury stock, value, acquired, cost method		$ 347,500,000	$ 35,400,000	$ 267,600,000
Treasury stock, share-based compensation shares, acquired (in shares)				394,326
Average price paid per share for common stock repurchased (in dollars per share)		$ 79.26	$ 113.70	$ 105.90
Series D Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares outstanding (in shares)		5,000	5,000
Per share ownership interest, percentage		1.00%
Preferred stock		$ 493,500,000	$ 493,500,000
Preferred stock, par value (in dollars per share)		$ 0
Preferred stock, liquidation preference		$ 100,000
Depository shares, liquidation preference (in dollars per share)		$ 1,000
Preferred stock, annual dividend rate		4.60%
Preferred stock, variable rate		3.202%
Series E Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares outstanding (in shares)		16,000	16,000
Per share ownership interest, percentage		0.10%
Preferred stock		$ 391,400,000	$ 391,400,000
Preferred stock, par value (in dollars per share)		$ 0
Preferred stock, liquidation preference		$ 25,000
Depository shares, liquidation preference (in dollars per share)		$ 25
Preferred stock, annual dividend rate		4.70%
Proceeds from issuance of preferred stock		$ 391,400,000	$ 391,400,000
Preferred stock, dividends per share, declared (in dollars per share)	$ 293.75
Series D Preferred Stock, Depositary Shares
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)		500,000
Series E Preferred Stock, Depositary Shares
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)		16,000,000

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Stockholders' Equity - Shares of Common Stock (Detail) - shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance (in shares)	208,428,309	207,761,875	208,289,178
Incentive Plan and Awards (in shares)	1,040,450	914,404	1,162,484
Stock Options Exercised (in shares)	42,143	63,566	837,757
Treasury Stock Purchased (in shares)	(4,384,678)	(311,536)	(2,527,544)
Ending balance (in shares)	205,126,224	208,428,309	207,761,875

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Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	$ 11,259.5	$ 12,016.8	$ 11,688.3
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)	431.3	(1,533.6)	(463.6)
Balance, end of period	11,897.9	11,259.5	12,016.8
TOTAL
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(1,569.2)	(35.6)	428.0
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)	431.3	(1,533.6)	(463.6)
Balance, end of period	(1,137.9)	(1,569.2)	(35.6)
NET UNREALIZED GAINS (LOSSES) ON AVAILABLE FOR SALE DEBT SECURITIES
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(1,367.6)	107.1	641.8
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)	443.7	(1,474.7)	(534.7)
Balance, end of period	(923.9)	(1,367.6)	107.1
NET UNREALIZED (LOSSES) GAINS ON CASH FLOW HEDGES
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	1.2	(2.4)	(3.2)
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)	(0.4)	3.6	0.8
Balance, end of period	0.8	1.2	(2.4)
NET FOREIGN CURRENCY ADJUSTMENT
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	164.6	155.2	144.7
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)	39.0	9.4	10.5
Balance, end of period	203.6	164.6	155.2
NET PENSION AND OTHER POSTRETIREMENT BENEFIT ADJUSTMENTS
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(367.4)	(295.5)	(355.3)
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)	(51.0)	(71.9)	59.8
Balance, end of period	$ (418.4)	$ (367.4)	$ (295.5)

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Accumulated Other Comprehensive Income (Loss) - Details of Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
PRE-TAX
Net Change	$ 551.5	$ (2,004.9)	$ (590.2)
TAX
Net Change	(120.2)	471.3	126.6
AFTER TAX
Net Change	431.3	(1,533.6)	(463.6)
U.S. | Pension Plans, Defined Benefit
AFTER TAX
Defined benefit plan, net periodic benefit cost (credit), gain (loss) due to settlement	0.0	(44.1)	(27.9)
Unrealized Gains (Losses) on Available for Sale Debt Securities
PRE-TAX
Gains (Losses)	319.4	(2,263.8)	(685.0)
Net Change	594.5	(1,984.7)	(721.3)
TAX
Gains (Losses)	(81.1)	580.2	177.5
Net Change	(150.8)	510.0	186.6
AFTER TAX
Gains (Losses)	238.3	(1,683.6)	(507.5)
Net Change	443.7	(1,474.7)	(534.7)
Interest income on debt securities
PRE-TAX
Reclassification Adjustment for Losses (Gains) Included in Net Income	105.6	65.1	(36.6)
TAX
Reclassification Adjustment for Losses (Gains) Included in Net Income	(26.7)	(16.4)	9.2
AFTER TAX
Reclassification Adjustment for Losses (Gains) Included in Net Income	78.9	48.7	(27.4)
Net gains on debt securities
PRE-TAX
Reclassification Adjustment for Losses (Gains) Included in Net Income	169.5	214.0	0.3
TAX
Reclassification Adjustment for Losses (Gains) Included in Net Income	(43.0)	(53.8)	(0.1)
AFTER TAX
Reclassification Adjustment for Losses (Gains) Included in Net Income	126.5	160.2	0.2
Unrealized (Losses) Gains on Cash Flow Hedges
PRE-TAX
Reclassification Adjustment for Losses (Gains) Included in Net Income	(36.8)	3.7	(4.5)
Net Change	(0.5)	4.7	1.1
TAX
Reclassification Adjustment for Losses (Gains) Included in Net Income	9.3	(0.8)	1.1
Net Change	0.1	(1.1)	(0.3)
AFTER TAX
Reclassification Adjustment for Losses (Gains) Included in Net Income	(27.5)	2.9	(3.4)
Net Change	(0.4)	3.6	0.8
Foreign Currency Adjustments
PRE-TAX
Net Change	22.5	76.0	53.4
TAX
Net Change	16.5	(66.6)	(42.9)
AFTER TAX
Net Change	39.0	9.4	10.5
Foreign Currency Translation Adjustments
PRE-TAX
Net Change	100.8	(200.1)	(133.8)
TAX
Net Change	(1.6)	3.0	4.1
AFTER TAX
Net Change	99.2	(197.1)	(129.7)
Long-Term Intra-Entity Foreign Currency Transaction (Losses) Gains
PRE-TAX
Net Change	(0.9)	(2.6)	0.6
TAX
Net Change	0.2	0.7	(0.1)
AFTER TAX
Net Change	(0.7)	(1.9)	0.5
Net Investment Hedge Gains (Losses)
PRE-TAX
Net Change	(77.4)	278.7	186.6
TAX
Net Change	17.9	(70.3)	(46.9)
AFTER TAX
Net Change	(59.5)	208.4	139.7
Pension and Other Postretirement Benefit Adjustments
PRE-TAX
Gains (Losses)	(71.4)	(163.9)	7.9
Net Change	(65.0)	(100.9)	76.6
TAX
Gains (Losses)	15.7	44.7	0.2
Net Change	14.0	29.0	(16.8)
AFTER TAX
Gains (Losses)	(55.7)	(119.2)	8.1
Net Change	(51.0)	(71.9)	59.8
Amortization of Net Actuarial Loss
PRE-TAX
Reclassification Adjustment for Losses (Gains) Included in Net Income	6.4	19.1	41.4
TAX
Reclassification Adjustment for Losses (Gains) Included in Net Income	(1.7)	(4.7)	(10.3)
AFTER TAX
Reclassification Adjustment for Losses (Gains) Included in Net Income	4.7	14.4	31.1
Amortization of Prior Service Cost (Credit)
PRE-TAX
Reclassification Adjustment for Losses (Gains) Included in Net Income	0.0	(1.0)	(1.0)
TAX
Reclassification Adjustment for Losses (Gains) Included in Net Income	0.0	0.3	0.3
AFTER TAX
Reclassification Adjustment for Losses (Gains) Included in Net Income	0.0	(0.7)	(0.7)
Settlement Loss
PRE-TAX
Reclassification Adjustment for Losses (Gains) Included in Net Income	0.0	44.9	28.3
TAX
Reclassification Adjustment for Losses (Gains) Included in Net Income	0.0	(11.3)	(7.0)
AFTER TAX
Reclassification Adjustment for Losses (Gains) Included in Net Income	0.0	33.6	21.3
Foreign Exchange Contracts | Unrealized (Losses) Gains on Cash Flow Hedges
PRE-TAX
Gains (Losses)	36.3	1.0	5.6
TAX
Gains (Losses)	(9.2)	(0.3)	(1.4)
AFTER TAX
Gains (Losses)	$ 27.1	$ 0.7	$ 4.2

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Net Income per Common Share - Net Income Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
BASIC NET INCOME PER COMMON SHARE
Average Number of Common Shares Outstanding (in shares)	207,248,094	208,309,331	208,075,522
Net Income	$ 1,107.3	$ 1,336.0	$ 1,545.3
Less: Dividends on Preferred Stock	41.8	41.8	41.8
Net Income Applicable to Common Stock	1,065.5	1,294.2	1,503.5
Less: Earnings Allocated to Participating Securities	11.6	11.8	12.9
Earnings Allocated to Common Shares Outstanding	$ 1,053.9	$ 1,282.4	$ 1,490.6
Basic Net Income Per Common Share (in dollars per share)	$ 5.09	$ 6.16	$ 7.16
DILUTED NET INCOME PER COMMON SHARE
Average Number of Common Shares Outstanding (in shares)	207,248,094	208,309,331	208,075,522
Plus Dilutive Effect of Share-based Compensation (in shares)	315,652	557,933	823,708
Average Common and Potential Common Shares (in shares)	207,563,746	208,867,264	208,899,230
Earnings Allocated to Common and Potential Common Shares	$ 1,053.9	$ 1,282.4	$ 1,490.6
Diluted Net Income Per Common Share (in dollars per share)	$ 5.08	$ 6.14	$ 7.14
Common stock equivalents not included in the computation of diluted earnings per share because their inclusion would have been antidilutive (in shares)	100,000	0	0

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Revenue from Contracts with Clients (Revenue Disaggregated by Major Source) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Trust, Investment and Other Servicing Fees			$ 4,361.8	$ 4,432.6	$ 4,361.1
Foreign Exchange Trading Income			203.9	288.6	292.6
Treasury Management Fees			31.6	39.3	44.3
Security Commissions and Trading Income			135.0	136.2	140.2
Other Operating Income			228.7	191.3	243.9
Investment Security Gains (Losses), net	$ (176.4)	$ 6.9	(169.5)	(214.0)	(0.3)
Total Other Noninterest Income			429.7	441.4	720.7
Total Noninterest Income			4,791.5	4,874.0	5,081.8
Custody and Fund Administration
Disaggregation of Revenue [Line Items]
Trust, Investment and Other Servicing Fees			1,805.3	1,816.0	1,917.5
Investment Management and Advisory
Disaggregation of Revenue [Line Items]
Trust, Investment and Other Servicing Fees			2,232.3	2,299.1	2,140.0
Securities Lending
Disaggregation of Revenue [Line Items]
Trust, Investment and Other Servicing Fees			83.9	81.6	76.9
Other
Disaggregation of Revenue [Line Items]
Trust, Investment and Other Servicing Fees			$ 240.3	$ 235.9	$ 226.7

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Revenue from Contracts with Clients (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Trust, investment and other servicing fees	$ 4,361.8	$ 4,432.6	$ 4,361.1
Security commissions and trading income	135.0	136.2	140.2
Other operating income	228.7	191.3	243.9
Securities Commission and Trading
Disaggregation of Revenue [Line Items]
Trust, investment and other servicing fees	115.9	116.8	112.1
Products and Services, Other Operating Income
Disaggregation of Revenue [Line Items]
Trust, investment and other servicing fees	$ 38.9	$ 37.2	$ 53.9

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Revenue from Contracts with Clients (Client Receivables) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Total Client Receivables	$ 928.4	$ 937.9
Trust Fees Receivable, net
Disaggregation of Revenue [Line Items]
Total Client Receivables	863.5	882.5
Contract with customer, asset, allowance for credit loss	15.9	13.5
Other
Disaggregation of Revenue [Line Items]
Total Client Receivables	$ 64.9	$ 55.4

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Net Interest Income (Net Interest Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Interest Income
Federal Reserve and Other Central Bank Deposits	$ 1,462.3	$ 472.0	$ 11.3
Interest-Bearing Due from and Deposits with Banks	130.1	46.6	9.1
Federal Funds Sold	0.3	0.1	0.0
Securities Purchased under Agreements to Resell	1,585.2	103.7	3.5
Securities – Taxable	1,534.4	899.9	658.8
Securities - Non-Taxable	1.3	1.3	1.5
Loans and Leases	2,551.1	1,344.3	713.5
Other Interest-Earning Assets	60.3	9.8	8.8
Total Interest Income	7,325.0	2,877.7	1,406.5
Interest Expense
Deposits	2,685.3	602.8	(61.3)
Federal Funds Purchased	256.9	34.1	(0.4)
Securities Sold under Agreements to Repurchase	1,541.1	90.7	0.2
Other Borrowings	542.5	126.2	14.2
Senior Notes	170.0	92.7	48.3
Long-Term Debt	147.2	44.0	21.1
Floating Rate Capital Debt	0.0	0.0	1.7
Total Interest Expense	5,343.0	990.5	23.8
Net Interest Income	$ 1,982.0	$ 1,887.2	$ 1,382.7

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Other Operating Income - (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Components of Other Operating Income [Line Items]
Total Other Operating Income	$ 228.7	$ 191.3	$ 243.9
Other Operating Income	228.7	191.3	243.9
Loan Service Fees
Components of Other Operating Income [Line Items]
Total Other Operating Income	83.1	71.5	66.6
Banking Service Fees
Components of Other Operating Income [Line Items]
Total Other Operating Income	53.0	49.8	50.9
Bank Owned Life Insurance
Components of Other Operating Income [Line Items]
Other Operating Income	69.5	61.0	48.5
Other Income
Components of Other Operating Income [Line Items]
Total Other Operating Income	$ 23.1	$ 9.0	$ 77.9

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Other Operating Expense (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other Income and Expenses [Abstract]
Business Promotion		$ 74.8	$ 76.7	$ 65.5
Staff Related		35.0	34.6	33.9
FDIC Insurance Premiums		112.0	17.8	14.6
Charitable Contributions		15.6	19.4	18.0
Other Expenses		235.5	210.8	167.1
Total Other Operating Expense		472.9	359.3	299.1
Noninterest expense		$ 5,284.2	$ 4,982.9	$ 4,535.9
Federal deposit insurance corporation premium expense, special assessment	$ 84.6

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Income Taxes - Income Taxes (Detail)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Statutory Federal Tax Rate	21.00%	21.00%	21.00%
State Taxes, net	3.40%	3.30%	3.40%
Foreign Tax Rate Differential	0.60%	0.10%	0.10%
Excess Tax Benefit Related to Share-Based Compensation	(0.10%)	(0.20%)	(0.40%)
Tax Credits	(2.70%)	(2.00%)	(1.60%)
Tax Exempt Income	(1.40%)	(0.90%)	(0.60%)
Valuation Allowance	1.80%	1.50%	0.60%
Other, net	1.80%	1.60%	0.60%
Effective Tax Rate	24.40%	24.40%	23.10%

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Income Taxes - Narrative (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Tax Credit Carryforward [Line Items]
Provision for income taxes	$ 357.5	$ 430.3	$ 464.8
Effective income tax rate reconciliation, percent	24.40%	24.40%	23.10%
Effective income tax rate reconciliation, prior year income taxes, amount			$ 26.8
Unrecognized tax benefit	$ 60.7	$ 40.7	25.3	$ 22.4
Increase in net income from recognition of unrecognized tax benefits	54.4	37.4
Interest and penalties, net of tax, included in the provision (benefit) for income taxes	(0.2)	(11.1)	$ 0.4
Income tax examination, penalties and interest accrued	22.7	22.2
Valuation allowance	121.2	95.3
State and Local Jurisdiction
Tax Credit Carryforward [Line Items]
Valuation allowance	0.4	0.4
Net operating loss carryforwards	0.4	0.4
Foreign Tax Authority
Tax Credit Carryforward [Line Items]
Valuation allowance	$ 120.7	$ 94.9

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Income Taxes - Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning Balance	$ 40.7	$ 25.3	$ 22.4
Additions for Tax Positions Taken in the Current Year	2.1	1.7	1.2
Additions for Tax Positions Taken in Prior Years	24.0	13.7	4.2
Reductions for Tax Positions Taken in Prior Years	(5.1)	0.0	(2.5)
Reductions Resulting from Expiration of Statutes	(1.0)	0.0	0.0
Ending Balance	$ 60.7	$ 40.7	$ 25.3

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Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current Tax Provision:
Federal	$ 250.5	$ 357.7	$ 241.5
State	63.2	84.7	74.0
Non-U.S.	92.0	130.6	147.3
Total	405.7	573.0	462.8
Deferred Tax Provision:
Federal	(54.0)	(126.0)	(11.7)
State	(1.4)	(10.7)	12.0
Non-U.S.	7.2	(6.0)	1.7
Total	(48.2)	(142.7)	2.0
Provision for Income Taxes	$ 357.5	$ 430.3	$ 464.8

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Income Taxes - Tax Charges and Benefits Recorded Directly to Stockholders' Equity (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Tax Effect of Other Comprehensive Income	$ 120.2	$ (471.3)	$ (126.6)

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Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Deferred Tax Liabilities:
Software Development	$ 394.9	$ 354.7
Depreciation and Amortization	23.9	122.6
Deferred Tax Assets, Compensation And Benefits	70.2	0.0
Compensation and Benefits	0.0	5.2
State Taxes, net	46.8	58.3
Other Liabilities	53.4	42.1
Gross Deferred Tax Liabilities	519.0	582.9
Deferred Tax Assets:
Allowance for Credit Losses	46.2	41.8
Unrealized Losses on Securities, net	244.6	427.3
Tax Credit and Loss Carryforwards	121.2	95.3
Other Assets	116.0	143.7
Gross Deferred Tax Assets	598.2	708.1
Valuation Reserve	(121.2)	(95.3)
Deferred Tax Assets, net of Valuation Reserve	477.0	612.8
Net Deferred Tax Assets (Liabilities)	$ (42.0)
Net Deferred Tax Assets (Liabilities)		$ 29.9

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Employee Benefits - Narrative (Detail)	1 Months Ended	6 Months Ended		9 Months Ended		12 Months Ended
	Jan. 31, 2024 USD ($)	Jun. 30, 2022	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2023 USD ($) investment numberOfDerivativeInstruments	Dec. 31, 2022 USD ($) numberOfDerivativeInstruments	Dec. 31, 2021 USD ($)	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Actuarial Loss (Gain)						$ 53,300,000	$ (365,500,000)
Estimated contribution defined contribution plans						$ 72,400,000	$ 67,200,000	$ 65,300,000
Number of investments held in diversified portfolios | investment						1
Number of derivatives held by the plan | numberOfDerivativeInstruments						4	4
Expected long-term rate of return on assets						7.25%
Subsequent Event
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected future employer contributions, remainder of fiscal year	$ 220,000,000
Trust for Benefit of Employees
Defined Benefit Plan Disclosure [Line Items]
Assets related to the pension plan						$ 90,300,000	$ 92,300,000
Long Credit Bonds
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets						45.00%
Global Equities
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets						20.00%
Custom Completion
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets						10.00%
High Yield Bonds
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets						5.00%
Northern Trust Private Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets						5.00%
Northern Trust Private Equity Funds | Upper Limit
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets						20.00%
Emerging Market Debt
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets						4.00%
Global Listed Infrastructure
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets						4.00%
Real Estate
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets						4.00%
Northern Trust Hedge Fund
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets						3.00%
Supplemental Plan
Defined Benefit Plan Disclosure [Line Items]
Assets related to the pension plan						$ 0	0
Prior service costs, amortization period (years)								10 years
Defined benefit plan, net periodic benefit cost (credit), gain (loss) due to settlement						0	0	$ 0
Actuarial Loss (Gain)						8,400,000	(20,000,000.0)
Prior service (benefit) cost						$ 0	$ 0	100,000
Weighted average discount rate used in determining the accumulated postretirement benefit obligation						4.95%	5.15%
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Assets related to the pension plan						$ 1,200,800,000	$ 1,176,800,000
Contributions made to the pension plan						$ 16,500,000	20,700,000
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period						60 days
Pension Plans, Defined Benefit | Lower Limit
Defined Benefit Plan Disclosure [Line Items]
Fair value, investments, entities that calculate net asset value per share, liquidating investment, remaining period						1 year
Pension Plans, Defined Benefit | Upper Limit
Defined Benefit Plan Disclosure [Line Items]
Fair value, investments, entities that calculate net asset value per share, liquidating investment, remaining period						15 years
Pension Plans, Defined Benefit | Northern Trust Private Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Assets related to the pension plan						$ 45,600,000	33,200,000
Pension Plans, Defined Benefit | Northern Trust Hedge Fund
Defined Benefit Plan Disclosure [Line Items]
Assets related to the pension plan						36,200,000	35,200,000
Pension Plans, Defined Benefit | Domestic Common Stock
Defined Benefit Plan Disclosure [Line Items]
Assets related to the pension plan						16,600,000	14,700,000
Pension Plans, Defined Benefit | Real Estate Funds
Defined Benefit Plan Disclosure [Line Items]
Assets related to the pension plan						$ 82,900,000	99,100,000
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period						45 days
U.S. | Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Assets related to the pension plan						$ 1,200,800,000	1,176,800,000	1,708,900,000
Contributions made to the pension plan						0	$ 0
Prior service costs, amortization period (years)							11 years
Defined benefit plan, net periodic benefit cost (credit), gain (loss) due to settlement						0	$ (44,100,000)	$ (27,900,000)
Actuarial Loss (Gain)						$ 36,800,000	(281,200,000)
Expected long-term rate of return on assets		6.00%	5.25%	6.50%	5.00%	7.25%		5.25%	5.25%
Prior service (benefit) cost						$ 0	$ (100,000)	$ (400,000)
Weighted average discount rate used in determining the accumulated postretirement benefit obligation						5.03%	5.22%
U.S. | Pension Plans, Defined Benefit | Subsequent Event
Defined Benefit Plan Disclosure [Line Items]
Contributions made to the pension plan	$ 200,000,000
U.S. | Pension Plans, Defined Benefit | Lower Limit
Defined Benefit Plan Disclosure [Line Items]
Contribution to plan assets						$ 0
U.S. | Pension Plans, Defined Benefit | Upper Limit
Defined Benefit Plan Disclosure [Line Items]
Contribution to plan assets						$ 420,000,000

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Employee Benefits - Employee Benefit Plan Status (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	$ 1,200.8	$ 1,176.8
Supplemental Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	94.1	97.4
Projected Benefit Obligation	109.2	113.6	$ 147.7
Plan Assets at Fair Value	0.0	0.0
Funded Status at end of year	$ (109.2)	$ (113.6)
Weighted-Average Assumptions:
Discount Rates	4.95%	5.15%
Rate of Increase in Compensation Level	5.56%	5.56%
U.S. | Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	$ 1,015.6	$ 963.3
Projected Benefit Obligation	1,151.7	1,077.7	1,401.3
Plan Assets at Fair Value	1,200.8	1,176.8	1,708.9
Funded Status at end of year	$ 49.1	$ 99.1
Weighted-Average Assumptions:
Discount Rates	5.03%	5.22%
Rate of Increase in Compensation Level	5.56%	5.56%
Expected Long-Term Rate of Return on Assets	7.25%	7.25%
Non U.S. Plans | Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	$ 143.7	$ 126.2
Projected Benefit Obligation	148.6	129.0	210.1
Plan Assets at Fair Value	148.7	134.5	$ 198.7
Funded Status at end of year	$ 0.1	$ 5.5
Weighted-Average Assumptions:
Discount Rates	3.12%	3.76%
Rate of Increase in Compensation Level	1.75%	1.75%
Expected Long-Term Rate of Return on Assets	3.90%	3.99%

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Employee Benefits - Amounts Included in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Supplemental Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Actuarial Loss	$ 62.3	$ 59.2
Prior Service (Credit) Cost	0.0	0.0
Gross Amount in Accumulated Other Comprehensive Income	62.3	59.2
Income Tax Effect	15.6	14.8
Net Amount in Accumulated Other Comprehensive Income	46.7	44.4
U.S. | Pension Plans, Defined Benefit
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Actuarial Loss	467.7	418.3
Prior Service (Credit) Cost	0.0	0.0
Gross Amount in Accumulated Other Comprehensive Income	467.7	418.3
Income Tax Effect	117.7	105.1
Net Amount in Accumulated Other Comprehensive Income	350.0	313.2
Non U.S. Plans | Pension Plans, Defined Benefit
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Actuarial Loss	34.4	24.3
Prior Service (Credit) Cost	0.0	0.2
Gross Amount in Accumulated Other Comprehensive Income	34.4	24.5
Income Tax Effect	5.1	4.9
Net Amount in Accumulated Other Comprehensive Income	$ 29.3	$ 19.6

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Employee Benefits - Net Periodic Pension Expense (Detail) - USD ($) $ in Millions	6 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Weighted-Average Assumptions:
Expected Long-Term Rate of Return on Assets					7.25%
Supplemental Plan
Defined Benefit plan Net periodic benefit cost
Service Cost					$ 4.8	$ 5.6	$ 5.3
Interest Cost					5.3	3.9	3.7
Expected Return on Plan Assets					0.0	0.0	0.0
Amortization:
Net Actuarial Loss					5.3	7.4	8.2
Prior Service (Credit) Cost					0.0	0.0	0.1
Net Periodic Pension Expense					15.4	16.9	17.3
Settlement Expense					0.0	0.0	0.0
Total Pension Expense					$ 15.4	$ 16.9	$ 17.3
Weighted-Average Assumptions:
Discount Rates					5.15%	2.80%	2.45%
Rate of Increase in Compensation Level					5.56%	4.97%	4.97%
U.S. | Pension Plans, Defined Benefit
Defined Benefit plan Net periodic benefit cost
Service Cost					$ 46.0	$ 48.0	$ 52.3
Interest Cost					53.9	46.3	40.4
Expected Return on Plan Assets					(100.9)	(85.7)	(79.0)
Amortization:
Net Actuarial Loss					1.5	11.4	32.4
Prior Service (Credit) Cost					0.0	(0.1)	(0.4)
Net Periodic Pension Expense					0.5	19.9	45.7
Settlement Expense					0.0	44.1	27.9
Total Pension Expense					$ 0.5	$ 64.0	$ 73.6
Weighted-Average Assumptions:
Discount Rates	4.81%	3.05%	5.49%	3.06%	5.22%	5.22%	3.03%	2.75%
Rate of Increase in Compensation Level					5.56%	4.97%	4.97%
Expected Long-Term Rate of Return on Assets	6.00%	5.25%	6.50%	5.00%	7.25%		5.25%	5.25%
Non U.S. Plans | Pension Plans, Defined Benefit
Defined Benefit plan Net periodic benefit cost
Service Cost					$ 1.6	$ 1.7	$ 2.2
Interest Cost					4.8	2.5	2.2
Expected Return on Plan Assets					(6.7)	(3.2)	(3.2)
Amortization:
Net Actuarial Loss					(0.4)	0.6	1.0
Prior Service (Credit) Cost					0.0	0.0	0.2
Net Periodic Pension Expense					(0.7)	1.6	2.4
Settlement Expense					0.0	0.8	0.4
Total Pension Expense					$ (0.7)	$ 2.4	$ 2.8
Weighted-Average Assumptions:
Discount Rates					3.76%	1.34%	0.93%
Rate of Increase in Compensation Level					1.75%	1.50%	1.50%
Expected Long-Term Rate of Return on Assets					3.99%	1.79%	1.28%

XML

Employee Benefits - Change in Projected Benefit Obligation (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Actuarial Loss (Gain)	$ 53.3	$ (365.5)
Supplemental Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning Balance	113.6	147.7
Service Cost	4.8	5.6	$ 5.3
Interest Cost	5.3	3.9	3.7
Employee Contributions	0.0	0.0
Plan Amendment	0.0	0.0
Actuarial Loss (Gain)	8.4	(20.0)
Settlements	0.0	0.0
Benefits Paid	(22.9)	(23.6)
Foreign Exchange Rate Changes	0.0	0.0
Ending Balance	109.2	113.6	147.7
U.S. | Pension Plans, Defined Benefit
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning Balance	1,077.7	1,401.3
Service Cost	46.0	48.0	52.3
Interest Cost	53.9	46.3	40.4
Employee Contributions	0.0	0.0
Plan Amendment	0.0	0.0
Actuarial Loss (Gain)	36.8	(281.2)
Settlements	0.0	(125.0)
Benefits Paid	(62.7)	(11.7)
Foreign Exchange Rate Changes	0.0	0.0
Ending Balance	1,151.7	1,077.7	1,401.3
Non U.S. Plans | Pension Plans, Defined Benefit
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning Balance	129.0	210.1
Service Cost	1.6	1.7	2.2
Interest Cost	4.8	2.5	2.2
Employee Contributions	0.8	0.7
Plan Amendment	(0.2)	(0.3)
Actuarial Loss (Gain)	8.1	(64.3)
Settlements	0.0	(0.9)
Benefits Paid	(4.1)	(4.6)
Foreign Exchange Rate Changes	8.6	(15.9)
Ending Balance	$ 148.6	$ 129.0	$ 210.1

XML

Employee Benefits - Estimated Future Benefit Payments (Detail) $ in Millions	Dec. 31, 2023 USD ($)
Supplemental Plan
Schedule of Pension Expected Future Benefit Payments [Line Items]
2024	$ 15.8
2025	16.1
2026	13.4
2027	11.2
2028	11.2
2029-2033	49.8
U.S. | Pension Plans, Defined Benefit
Schedule of Pension Expected Future Benefit Payments [Line Items]
2024	95.7
2025	99.6
2026	98.9
2027	101.2
2028	98.6
2029-2033	487.6
Non U.S. Plans | Pension Plans, Defined Benefit
Schedule of Pension Expected Future Benefit Payments [Line Items]
2024	6.2
2025	4.7
2026	5.5
2027	6.5
2028	6.8
2029-2033	$ 35.3

XML

Employee Benefits - Change In Plan Assets (Detail) - Pension Plans, Defined Benefit - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value at beginning of year	$ 1,176.8
Employer Contributions	16.5	$ 20.7
Fair Value at end of year	1,200.8	1,176.8
U.S.
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value at beginning of year	1,176.8	1,708.9
Actual Return on Assets	86.8	(395.4)
Employer Contributions	0.0	0.0
Employee Contributions	0.0	0.0
Settlements	0.0	(125.0)
Benefits Paid	(62.8)	(11.7)
Foreign Exchange Rate Changes	0.0	0.0
Fair Value at end of year	1,200.8	1,176.8
Non U.S. Plans
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value at beginning of year	134.5	198.7
Actual Return on Assets	5.0	(46.9)
Employer Contributions	3.9	3.6
Employee Contributions	0.8	0.7
Settlements	0.0	(0.9)
Benefits Paid	(4.1)	(4.6)
Foreign Exchange Rate Changes	8.6	(16.1)
Fair Value at end of year	$ 148.7	$ 134.5

XML

Employee Benefits - Fair Value of U.S. Pension Plan Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Northern Trust Private Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List]	Fair Value Measured at Net Asset Value Per Share [Member]	Fair Value Measured at Net Asset Value Per Share [Member]
Northern Trust Hedge Fund
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List]	Fair Value Measured at Net Asset Value Per Share [Member]	Fair Value Measured at Net Asset Value Per Share [Member]
Real Estate Funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List]	Fair Value Measured at Net Asset Value Per Share [Member]	Fair Value Measured at Net Asset Value Per Share [Member]
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	$ 1,200.8	$ 1,176.8
Pension Plans, Defined Benefit | Domestic Common Stock
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	16.6	14.7
Pension Plans, Defined Benefit | Foreign Common Stock
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	0.3	0.5
Pension Plans, Defined Benefit | Domestic Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	218.2	263.6
Pension Plans, Defined Benefit | Foreign Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	33.6	39.6
Pension Plans, Defined Benefit | U.S. Government Obligations
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	87.5	77.5
Pension Plans, Defined Benefit | Non-U.S. Government Obligations
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	14.0	13.8
Pension Plans, Defined Benefit | Domestic Municipal and Provincial Bonds
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	17.2	16.8
Pension Plans, Defined Benefit | Foreign Municipal and Provincial Bonds
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	0.3	0.2
Pension Plans, Defined Benefit | Collective Trust Funds
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	571.5	522.3
Pension Plans, Defined Benefit | Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	80.3	61.4
Pension Plans, Defined Benefit | Cash and Other
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	(3.4)	(1.1)
Pension Plans, Defined Benefit | Northern Trust Private Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	45.6	33.2
Pension Plans, Defined Benefit | Northern Trust Hedge Fund
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	36.2	35.2
Pension Plans, Defined Benefit | Real Estate Funds
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	82.9	99.1
Pension Plans, Defined Benefit | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	1,036.1	1,009.3
Pension Plans, Defined Benefit | LEVEL 1
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	93.8	75.5
Pension Plans, Defined Benefit | LEVEL 1 | Domestic Common Stock
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	16.6	14.7
Pension Plans, Defined Benefit | LEVEL 1 | Foreign Common Stock
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	0.3	0.5
Pension Plans, Defined Benefit | LEVEL 1 | Domestic Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	0.0	0.0
Pension Plans, Defined Benefit | LEVEL 1 | Foreign Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	0.0	0.0
Pension Plans, Defined Benefit | LEVEL 1 | U.S. Government Obligations
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	0.0	0.0
Pension Plans, Defined Benefit | LEVEL 1 | Non-U.S. Government Obligations
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	0.0	0.0
Pension Plans, Defined Benefit | LEVEL 1 | Domestic Municipal and Provincial Bonds
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	0.0	0.0
Pension Plans, Defined Benefit | LEVEL 1 | Foreign Municipal and Provincial Bonds
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	0.0	0.0
Pension Plans, Defined Benefit | LEVEL 1 | Collective Trust Funds
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	0.0	0.0
Pension Plans, Defined Benefit | LEVEL 1 | Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	80.3	61.4
Pension Plans, Defined Benefit | LEVEL 1 | Cash and Other
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	(3.4)	(1.1)
Pension Plans, Defined Benefit | LEVEL 2
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	942.3	933.8
Pension Plans, Defined Benefit | LEVEL 2 | Domestic Common Stock
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	0.0	0.0
Pension Plans, Defined Benefit | LEVEL 2 | Foreign Common Stock
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	0.0	0.0
Pension Plans, Defined Benefit | LEVEL 2 | Domestic Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	218.2	263.6
Pension Plans, Defined Benefit | LEVEL 2 | Foreign Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	33.6	39.6
Pension Plans, Defined Benefit | LEVEL 2 | U.S. Government Obligations
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	87.5	77.5
Pension Plans, Defined Benefit | LEVEL 2 | Non-U.S. Government Obligations
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	14.0	13.8
Pension Plans, Defined Benefit | LEVEL 2 | Domestic Municipal and Provincial Bonds
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	17.2	16.8
Pension Plans, Defined Benefit | LEVEL 2 | Foreign Municipal and Provincial Bonds
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	0.3	0.2
Pension Plans, Defined Benefit | LEVEL 2 | Collective Trust Funds
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	571.5	522.3
Pension Plans, Defined Benefit | LEVEL 2 | Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	0.0	0.0
Pension Plans, Defined Benefit | LEVEL 2 | Cash and Other
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	0.0	0.0
Pension Plans, Defined Benefit | LEVEL 3
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	0.0	0.0
Pension Plans, Defined Benefit | LEVEL 3 | Domestic Common Stock
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	0.0	0.0
Pension Plans, Defined Benefit | LEVEL 3 | Foreign Common Stock
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	0.0	0.0
Pension Plans, Defined Benefit | LEVEL 3 | Domestic Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	0.0	0.0
Pension Plans, Defined Benefit | LEVEL 3 | Foreign Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	0.0	0.0
Pension Plans, Defined Benefit | LEVEL 3 | U.S. Government Obligations
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	0.0	0.0
Pension Plans, Defined Benefit | LEVEL 3 | Non-U.S. Government Obligations
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	0.0	0.0
Pension Plans, Defined Benefit | LEVEL 3 | Domestic Municipal and Provincial Bonds
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	0.0	0.0
Pension Plans, Defined Benefit | LEVEL 3 | Foreign Municipal and Provincial Bonds
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	0.0	0.0
Pension Plans, Defined Benefit | LEVEL 3 | Collective Trust Funds
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	0.0	0.0
Pension Plans, Defined Benefit | LEVEL 3 | Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	0.0	0.0
Pension Plans, Defined Benefit | LEVEL 3 | Cash and Other
Defined Benefit Plan Disclosure [Line Items]
Plan Assets at Fair Value	$ 0.0	$ 0.0

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Share-Based Compensation Plans - Total Compensation Expense for Share-Based Payment Arrangements to Employees (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Share-Based Compensation Expense	$ 118.2	$ 125.2	$ 95.5
Tax Benefits Recognized	29.9	31.4	24.0
Restricted Stock Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Share-Based Compensation Expense	95.7	96.4	78.2
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Share-Based Compensation Expense	$ 22.5	$ 28.8	$ 17.3

XML

Share-Based Compensation Plans - Narrative (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to unvested share-based compensation	$ 96.0
Weighted average period of recognition of unvested share-based compensation (in years)	3 years
Share-based compensation expense	$ 118.2	$ 125.2	$ 95.5
Share-based Payment Arrangement, Nonemployee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion ratio	1
Granted (in shares)	20,405	14,773	13,968
Stock units granted during period	$ 1.6	$ 1.6	$ 1.5
Share-based compensation expense	$ 1.7	$ 1.7	$ 1.6
Stock Incentive Plan 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock authorized for issuance under the Plan (in shares)	20,000,000
Stock Incentive Plan 2012 Plan and 2002 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grant under the Plan (in shares)	13,718,608
Stock options under the Plan, the 2002 Plan, and the 1992 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period (in shares)	0	0	0
Stock options under the Plan, the 2002 Plan, and the 1992 Plan | Upper Limit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option maximum term (in years)	10 years
Options vest and become exercisable after the date of grant (in years)	4 years
Stock options under the Plan, the 2002 Plan, and the 1992 Plan | Lower Limit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of the fair value for options to purchase common stock on the date the options are granted	100.00%
Options vest and become exercisable after the date of grant (in years)	1 year
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion ratio	1
Granted (in shares)	219,314	211,906	204,539
Restricted stock units weighted average grant date fair value (in usd per share)	$ 93.97	$ 113.64	$ 97.77
Performance based units vesting period	3 years
Shares outstanding (in shares)	613,450	607,892	622,817
Aggregate intrinsic value of options granted	$ 51.8	$ 53.8	$ 74.5
Vesting term of units granted	1 year	1 year	1 year
Share-based compensation expense	$ 22.5	$ 28.8	$ 17.3
Performance stock units, granted | Upper Limit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage at which units can vest	150.00%
Performance stock units, granted | Lower Limit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage at which units can vest	0.00%
Restricted Stock Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	1,166,376	1,061,573	846,433
Restricted stock units weighted average grant date fair value (in usd per share)	$ 91.56	$ 110.99	$ 99.31
Fair value of restricted stock units vested	$ 85.9	$ 75.6	$ 89.4
Shares outstanding (in shares)	2,481,171	2,223,657
Share-based compensation expense	$ 95.7	$ 96.4	$ 78.2
Restricted Stock Unit Awards | Fourth Anniversary Of Grant Date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion ratio	1
Percentage at which units can vest	25.00%
Performance based units vesting period	4 years

XML

Share-Based Compensation Plans - Stock Options Granted, Vested, and Exercised (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-Based Payment Arrangement [Abstract]
Grant-Date Fair Value of Stock Options Vested	$ 0.0	$ 0.0	$ 2.2
Stock Options Exercised
Intrinsic Value as of Exercise Date	1.6	3.6	41.3
Cash Received	2.3	3.9	53.8
Tax Deduction Benefits Realized	$ 1.6	$ 3.5	$ 41.3

XML

Share-Based Compensation Plans - Status of Stock Options and Changes (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
SHARES
Exercised (in shares)	(42,143)	(63,566)	(837,757)
Stock options under the Plan, the 2002 Plan, and the 1992 Plan
SHARES
Options Outstanding, at beginning of the year (in shares)	441,547
Granted (in shares)	0
Exercised (in shares)	(42,143)
Forfeited, Expired or Cancelled (in shares)	0
Options Outstanding, at the end of year (in shares)	399,404	441,547
Options Exercisable at the end of year (in shares)	399,404
WEIGHTED AVERAGE EXERCISE PRICE PER SHARE
Options Outstanding, Beginning Balance (in dollars per share)	$ 72.58
Granted (in dollars per share)	0
Exercised (in dollars per share)	54.87
Forfeited, Expired or Cancelled (in dollars per share)	0
Options Outstanding, Ending Balance (in dollars per share)	74.45	$ 72.58
Options Exercisable, at the end of the year (in dollars per share)	$ 74.45
WEIGHTED AVERAGE REMAINING CONTRACTUAL TERM (YEARS)
Options Outstanding, at the end of the year	1 year 10 months 24 days
Options Exercisable, at the end of the year	1 year 10 months 24 days
AGGREGATE INTRINSIC VALUE
Options Outstanding, at the end of year	$ 4.7
Options Exercisable at end of the year	$ 4.7

XML

Share-Based Compensation Plans - Outstanding Restricted Stock Unit Awards (Detail) - Restricted Stock Unit Awards - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
NUMBER
Balance at beginning of period (in shares)	2,243,183
Granted (in shares)	1,166,376
Distributed (in shares)	(847,281)
Forfeited (in shares)	(62,220)
Balance at end of period (in shares)	2,500,058
Units Convertible, at the end of year (in shares)	18,887
AGGREGATE INTRINSIC VALUE
AGGREGATE INTRINSIC VALUE	$ 211.0	$ 198.5
Units Convertible, at the end of year	$ 1.6

XML

Share-Based Compensation Plans - Nonvested Restricted Stock Unit Awards (Detail) - Restricted Stock Unit Awards - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
NUMBER
Beginning Balance (in shares)	2,223,657
Granted (in shares)	1,166,376	1,061,573	846,433
Vested (in shares)	(846,642)
Forfeited (in shares)	(62,220)
Ending Balance (in shares)	2,481,171	2,223,657
WEIGHTED AVERAGE GRANT- DATE FAIR VALUE PER UNIT
Nonvested at beginning of year (in dollars per share)	$ 103.41
Granted (in dollars per share)	91.56	$ 110.99	$ 99.31
Vested (in dollars per share)	101.38
Forfeited (in dollars per share)	99.66
Nonvested at end of year (in dollars per share)	$ 98.62	$ 103.41
WEIGHTED AVERAGE REMAINING VESTING TERM (YEARS)
WEIGHTED AVERAGE REMAINING VESTING TERM (YEARS)	2 years 4 months 24 days	2 years 4 months 24 days

XML

Cash-Based Compensation Plans - Narrative (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Compensation Related Costs [Abstract]
Cash based compensation expense	$ 358.7	$ 392.7	$ 377.1

XML

Commitments and Contingent Liabilities - Summary of Off-Balance Sheet Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Loss Contingencies [Line Items]
ONE YEAR AND LESS	$ 265,837.5	$ 162,025.4
OVER ONE YEAR	19,549.9	17,732.6
TOTAL	285,387.4	179,758.0
Legally Binding Commitments to Extend Credit
Loss Contingencies [Line Items]
Commitments, participated to others	222.2	266.6
Financial Guarantee
Loss Contingencies [Line Items]
ONE YEAR AND LESS	140,539.1	130,311.0
OVER ONE YEAR	0.0	0.0
TOTAL	140,539.1	130,311.0
Secured by Cash Deposits or Participated to Others | Standby Letters of Credit
Loss Contingencies [Line Items]
TOTAL	39.1	35.1
Standby Letter of Credit and Financial Guarantee
Loss Contingencies [Line Items]
Guarantor obligations, current carrying value	84,600.0
Guarantees to sponsored member programs		16,300.0
Legally Binding Commitments to Extend Credit
Loss Contingencies [Line Items]
ONE YEAR AND LESS	11,849.5	13,639.2
OVER ONE YEAR	18,909.6	17,321.4
TOTAL	30,759.1	30,960.6
Standby Letters of Credit
Loss Contingencies [Line Items]
ONE YEAR AND LESS	85,752.0	17,553.0
OVER ONE YEAR	639.0	409.9
TOTAL	86,391.0	17,962.9
Commercial Letters of Credit
Loss Contingencies [Line Items]
ONE YEAR AND LESS	29.2	25.4
OVER ONE YEAR	1.3	1.3
TOTAL	30.5	26.7
Unsettled Reverse Repurchase Agreements
Loss Contingencies [Line Items]
ONE YEAR AND LESS	27,667.7	496.8
OVER ONE YEAR	0.0	0.0
TOTAL	$ 27,667.7	$ 496.8

XML

Commitments and Contingent Liabilities - Narrative (Detail) shares in Millions		1 Months Ended		12 Months Ended
	Sep. 13, 2023 exchangeOffer	Jun. 30, 2016 USD ($) shares	Jun. 30, 2015 USD ($) shares	Dec. 31, 2023 USD ($) shares	Dec. 31, 2015 trust	Dec. 31, 2022 USD ($) shares
Loss Contingencies [Line Items]
Minimum collateral maintained against fair value of client securities loaned plus accrued interest				100.00%
Fair value disclosure, off-balance sheet risks, amount, liability				$ 285,387,400,000		$ 179,758,000,000
Repurchase agreement counterparty, amount at risk				0		0
Resell agreements, period end amounts excluding effects of agreements reported net by counterparty				27,700,000,000		496,800,000
Accruals recorded for pending litigation or threatened legal actions or regulatory matters				0
Payment to escrow deposit				$ 2,800,000,000
Common stock, convertible, conversion price (in USD per share)				1.5875
Financial Guarantee
Loss Contingencies [Line Items]
Fair value disclosure, off-balance sheet risks, amount, liability				$ 140,539,100,000		130,311,000,000
Indemnification Agreement
Loss Contingencies [Line Items]
Credit loss liability				$ 0		$ 0
Visa Class B
Loss Contingencies [Line Items]
Redemption gain		$ 123,100,000	$ 99,900,000
Common stock issued (in shares) | shares		1.1	1.0
Common stock shares held (in shares) | shares				4.1		4.1
Remaining visa shares held by Northern Trust, original cost basis				$ 0		$ 0
Visa Class C Convertible Into Visa Class A
Loss Contingencies [Line Items]
Potential exchange offer program, number of exchange offers | exchangeOffer	3
Potential exchange offer program, length of time between exchanges	12 months
Potential exchange offer program, claim reduction percentage	50.00%
Visa Class C Convertible Into Visa Class A | Period One
Loss Contingencies [Line Items]
Potential exchange offer program, conversion period	45 days
Potential exchange offer program, exchange ratio	0.3333
Visa Class C Convertible Into Visa Class A | Period Two
Loss Contingencies [Line Items]
Potential exchange offer program, conversion period	90 days
Potential exchange offer program, exchange ratio	0.6666
Visa Class C Convertible Into Visa Class A | Period Three
Loss Contingencies [Line Items]
Potential exchange offer program, conversion period	90 days
Northern Trust Fiduciary Services (Guernsey) Limited | Subsidiaries
Loss Contingencies [Line Items]
Number of administrated trusts served as trustee on | trust					2
Lower Limit
Loss Contingencies [Line Items]
Possible loss in future periods in excess of accrual				0
Upper Limit
Loss Contingencies [Line Items]
Possible loss in future periods in excess of accrual				$ 25,000,000

XML

Derivative Financial Instruments - Notional and Fair Value Amounts of Derivative Financial Instruments (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
NOTIONAL VALUE	$ 340,383.3	$ 310,684.3
ASSET	3,307.8	3,151.2
Asset, Total Gross Derivative	3,568.2	3,732.4
Less: Asset, Netting	3,126.7	2,810.7
Derivative Asset	441.5	921.7
LIABILITY	2,806.3	2,548.9
Derivative Liabilities	3,649.8	3,654.1
Less: Liability, Netting	2,205.4	1,865.9
Derivative Liabilities	1,444.4	1,788.2
Derivatives Designated as Hedging under GAAP
Derivative [Line Items]
NOTIONAL VALUE	12,573.7	8,537.9
ASSET	123.0	349.4
LIABILITY	145.1	51.1
Derivatives Designated as Hedging under GAAP | Fair Value Hedges | Interest Rate Contracts
Derivative [Line Items]
NOTIONAL VALUE	7,042.7	4,622.0
ASSET	94.7	58.5
LIABILITY	71.0	32.7
Derivatives Designated as Hedging under GAAP | Cash Flow Hedges | Foreign Exchange Contracts
Derivative [Line Items]
NOTIONAL VALUE	1,453.6	150.9
ASSET	15.0	7.4
LIABILITY	42.2	5.7
Derivatives Designated as Hedging under GAAP | Net Investment Hedges | Foreign Exchange Contracts
Derivative [Line Items]
NOTIONAL VALUE	4,077.4	3,765.0
ASSET	13.3	283.5
LIABILITY	31.9	12.7
Total Derivatives Not Designated as Hedging under GAAP | Fair Value Hedges
Derivative [Line Items]
NOTIONAL VALUE	327,809.6	302,146.4
ASSET	3,445.2	3,383.0
LIABILITY	3,504.7	3,603.0
Derivatives Not Designated as Hedging under GAAP | Fair Value Hedges
Derivative [Line Items]
NOTIONAL VALUE	888.6	773.6
ASSET	0.0	0.4
LIABILITY	25.5	34.9
Derivatives Not Designated as Hedging under GAAP | Fair Value Hedges | Foreign Exchange Contracts
Derivative [Line Items]
NOTIONAL VALUE	20.7	55.9
ASSET	0.0	0.1
LIABILITY	0.1	0.1
Derivatives Not Designated as Hedging under GAAP | Fair Value Hedges | Other Financial Derivatives
Derivative [Line Items]
NOTIONAL VALUE	867.9	717.7
ASSET	0.0	0.3
LIABILITY	25.4	34.8
Client-Related and Trading Derivatives | Fair Value Hedges
Derivative [Line Items]
NOTIONAL VALUE	326,921.0	301,372.8
ASSET	3,445.2	3,382.6
LIABILITY	3,479.2	3,568.1
Client-Related and Trading Derivatives | Fair Value Hedges | Foreign Exchange Contracts
Derivative [Line Items]
NOTIONAL VALUE	313,336.9	288,994.6
ASSET	3,238.4	3,219.1
LIABILITY	3,181.0	3,169.0
Client-Related and Trading Derivatives | Fair Value Hedges | Interest Rate Contracts
Derivative [Line Items]
NOTIONAL VALUE	13,584.1	12,378.2
ASSET	206.8	163.5
LIABILITY	$ 298.2	$ 399.1

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Derivative Financial Instruments - Narrative (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Net foreign exchange contract gains (losses) reclassified from AOCI	$ 0	$ 0	$ 0
Maximum length of time being hedged for exposure to variability in future cash flows of forecasted foreign currency denominated transactions	4 months
Net investment hedge gain (loss) recognized in AOCI	$ (77,400,000)	$ 278,700,000
Foreign Currency Denominate
Derivative [Line Items]
Estimated net gain (loss) to be reclassified into earnings within the next twelve months relating to cash flow hedges	$ 27,300,000

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Derivative Financial Instruments - Location and Amount of Fair Value Hedge Derivative Gains and Losses Recorded in Income (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Interest Income	$ 7,325.0	$ 2,877.7	$ 1,406.5
Interest Expense	5,343.0	990.5	23.8
Other Operating Income	228.7	191.3	243.9
INTEREST INCOME
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses) recognized on fair value hedges	47.1	(4.4)	(16.2)
Total gain/(loss) recognized on cash flow hedges	34.9	0.6	10.5
INTEREST EXPENSE
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses) recognized on fair value hedges	(86.5)	24.1	57.1
Total gain/(loss) recognized on cash flow hedges	0.0	0.0	0.0
OTHER OPERATING INCOME
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses) recognized on fair value hedges	0.0	0.0	0.0
Total gain/(loss) recognized on cash flow hedges	1.9	(4.3)	(6.0)
Interest Rate Contracts | INTEREST INCOME
Derivative Instruments, Gain (Loss) [Line Items]
Interest Rate Contracts, Recognized on Derivatives	(132.6)	82.8	39.1
Interest Rate Contracts, Recognized on Hedged Items	132.6	(82.8)	(39.1)
Interest Rate Contracts, Amounts Related to Interest Settlements on Derivatives	47.1	(4.4)	(16.2)
Interest Rate Contracts | INTEREST EXPENSE
Derivative Instruments, Gain (Loss) [Line Items]
Interest Rate Contracts, Recognized on Derivatives	74.9	(373.4)	(161.6)
Interest Rate Contracts, Recognized on Hedged Items	(74.9)	373.4	161.6
Interest Rate Contracts, Amounts Related to Interest Settlements on Derivatives	(86.5)	24.1	57.1
Interest Rate Contracts | OTHER OPERATING INCOME
Derivative Instruments, Gain (Loss) [Line Items]
Interest Rate Contracts, Recognized on Derivatives	0.0	0.0	0.0
Interest Rate Contracts, Recognized on Hedged Items	0.0	0.0	0.0
Interest Rate Contracts, Amounts Related to Interest Settlements on Derivatives	0.0	0.0	0.0
Foreign Exchange Contracts | INTEREST INCOME
Derivative Instruments, Gain (Loss) [Line Items]
Total gain/(loss) recognized on cash flow hedges	34.9	0.6	10.5
Foreign Exchange Contracts | INTEREST EXPENSE
Derivative Instruments, Gain (Loss) [Line Items]
Total gain/(loss) recognized on cash flow hedges	0.0	0.0	0.0
Foreign Exchange Contracts | OTHER OPERATING INCOME
Derivative Instruments, Gain (Loss) [Line Items]
Total gain/(loss) recognized on cash flow hedges	$ 1.9	$ (4.3)	$ (6.0)

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Derivative Financial Instruments - Hedged Items in Fair Value (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Carrying Value Of The Hedged Items, Available for Sale Debt Securities	$ 5,048,800,000	$ 1,820,800,000
Carrying Value Of The Hedged Items, Senior Notes and Long-Term Subordinated Debt	2,495,900,000	2,746,200,000
Cumulative Hedge Accounting Basis Adjustment, Available for Sale Debt Securities	$ 77,500,000	$ (60,200,000)
Hedged Liability, Statement of Financial Position [Extensible Enumeration]	Senior Notes, Long-Term Debt	Senior Notes, Long-Term Debt
Cumulative Hedge Accounting Basis Adjustment, Senior Notes and Long-Term Subordinated Debt	$ (248,700,000)	$ (294,000,000.0)
Hedged asset, fair value hedge, discontinued, cumulative increase (decrease)	2,200,000
Hedged liability, fair value hedge, discontinued, cumulative increase (decrease)	29,600,000	0
Hedged asset (liability), fair value hedge, discontinued, cumulative increase (decrease), net		7,300,000
Credit Loss, Excluding Accrued Interest, Expense (Reversal)	$ (24,600,000)	$ (10,700,000)	$ 81,500,000
Hedged Asset, Statement of Financial Position [Extensible Enumeration]	Available for Sale (Amortized cost of $23,659.0 and $27,760.0)	Available for Sale (Amortized cost of $23,659.0 and $27,760.0)

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Derivative Financial Instruments - Location and Amount of Gains and Losses Recorded in Income for Derivatives not Designated as Hedging Under GAAP (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Non-designated risk management derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses) from derivatives not designated as hedging under GAAP	$ (19.4)	$ (25.3)	$ (20.1)
Client-related and trading derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses) from derivatives not designated as hedging under GAAP	212.8	298.2	308.3
Total Derivatives Not Designated as Hedging under GAAP
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses) from derivatives not designated as hedging under GAAP	193.4	272.9	288.2
Foreign Exchange Contracts | Non-designated risk management derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses) from derivatives not designated as hedging under GAAP	$ 1.8	$ (3.1)	$ 1.2
Derivative, gain (loss), statement of income or comprehensive income [Extensible Enumeration]	Other Operating Income	Other Operating Income	Other Operating Income
Foreign Exchange Contracts | Client-related and trading derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses) from derivatives not designated as hedging under GAAP	$ 203.9	$ 288.6	$ 292.6
Derivative, gain (loss), statement of income or comprehensive income [Extensible Enumeration]	Foreign Exchange Trading Income	Foreign Exchange Trading Income	Foreign Exchange Trading Income
Other Financial Derivatives | Non-designated risk management derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses) from derivatives not designated as hedging under GAAP	$ (21.2)	$ (22.2)	$ (21.3)
Derivative, gain (loss), statement of income or comprehensive income [Extensible Enumeration]	Other Operating Income	Other Operating Income	Other Operating Income
Interest Rate Contracts | Client-related and trading derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses) from derivatives not designated as hedging under GAAP	$ 8.9	$ 9.6	$ 15.7
Derivative, gain (loss), statement of income or comprehensive income [Extensible Enumeration]	Security Commissions and Trading Income	Security Commissions and Trading Income	Security Commissions and Trading Income

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Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repurchase - Securities Purchased under Agreements to Resell (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Balance at December 31	$ 784.7	$ 1,070.3
Average Balance During the Year	$ 950.9	$ 1,071.2
Average Interest Rate Earned During the Year	166.71%	9.68%
Maximum Month-End Balance During the Year	$ 1,326.2	$ 1,320.8
Securities purchased under agreements to resell, netting impact	$ 29,100.0	$ 3,600.0

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Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repurchase - Securities Sold under Agreements to Repurchase (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Securities Sold Under Agreements to Repurchase	$ 784.7	$ 567.2
Average Balance During the Year	$ 401.5	$ 433.6
Average Interest Rate Paid During the Year	383.84%	20.94%
Maximum Month-End Balance During the Year	$ 988.1	$ 869.0
Securities sold under agreements to repurchase, netting impact	$ 29,100.0	$ 3,600.0

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Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repurchase - Repurchase Agreements Accounted for as Secured Borrowings (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Sold Under Agreements to Repurchase	$ 784.7	$ 567.2
Maturity Overnight and Continuous
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total borrowings, repurchase agreements	784.7	567.2
Maturity Overnight and Continuous | U.S. Treasury and Agency Securities
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total borrowings, repurchase agreements	$ 784.7	$ 567.2

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Offsetting of Assets and Liabilities - Offsetting of Derivative Assets and Securities Purchased Under Agreements to Resell (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Total Derivatives Subject to a Master Netting Arrangement
GROSS RECOGNIZED ASSETS	$ 3,307.8	$ 3,151.2
GROSS AMOUNTS OFFSET IN THE BALANCE SHEET	3,126.7	2,810.7
NET AMOUNTS PRESENTED IN THE BALANCE SHEET	181.1	340.5
GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET	12.2	5.0
NET AMOUNT	168.9	335.5
Total Derivatives Not Subject to a Master Netting Arrangement
Total Derivatives Not Subject to a Master Netting Arrangement	260.4	581.2
Total Derivatives
GROSS RECOGNIZED ASSETS	3,568.2	3,732.4
Derivative Asset	441.5	921.7
NET AMOUNT	429.3	916.7
Securities Purchased under Agreements to Resell
GROSS RECOGNIZED ASSETS	62,860.2	12,494.2
GROSS AMOUNTS OFFSET IN THE BALANCE SHEET	62,075.5	11,423.9
NET AMOUNTS PRESENTED IN THE BALANCE SHEET	784.7	1,070.3
GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET	0.0	1,070.3
NET AMOUNT	784.7	0.0
Other assets (excluding derivative assets)	10,300.0	8,900.0
Foreign Exchange Contracts | Over the Counter Derivative
Total Derivatives Subject to a Master Netting Arrangement
GROSS RECOGNIZED ASSETS	3,006.3	2,928.9
GROSS AMOUNTS OFFSET IN THE BALANCE SHEET	2,937.2	2,666.4
NET AMOUNTS PRESENTED IN THE BALANCE SHEET	69.1	262.5
GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET	12.2	5.0
NET AMOUNT	56.9	257.5
Interest Rate Swaps | Over the Counter Derivative
Total Derivatives Subject to a Master Netting Arrangement
GROSS RECOGNIZED ASSETS	301.4	217.6
GROSS AMOUNTS OFFSET IN THE BALANCE SHEET	189.5	144.3
NET AMOUNTS PRESENTED IN THE BALANCE SHEET	111.9	73.3
GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET	0.0	0.0
NET AMOUNT	111.9	73.3
Interest Rate Swaps | Interest Rate Swaps Exchange Cleared
Total Derivatives Subject to a Master Netting Arrangement
GROSS RECOGNIZED ASSETS	0.1	4.4
GROSS AMOUNTS OFFSET IN THE BALANCE SHEET	0.0	0.0
NET AMOUNTS PRESENTED IN THE BALANCE SHEET	0.1	4.4
GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET	0.0	0.0
NET AMOUNT	$ 0.1	4.4
Other Financial Derivatives | Other Financial Derivatives
Total Derivatives Subject to a Master Netting Arrangement
GROSS RECOGNIZED ASSETS		0.3
GROSS AMOUNTS OFFSET IN THE BALANCE SHEET		0.0
NET AMOUNTS PRESENTED IN THE BALANCE SHEET		0.3
GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET		0.0
NET AMOUNT		$ 0.3

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Offsetting of Assets and Liabilities - Offsetting of Derivative Liabilities and Securities Sold Under Agreements to Repurchase (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Total Derivatives Subject to a Master Netting Arrangement
GROSS RECOGNIZED LIABILITIES	$ 2,806.3	$ 2,548.9
GROSS AMOUNTS OFFSET IN THE BALANCE SHEET	2,205.4	1,865.9
NET AMOUNTS PRESENTED IN THE BALANCE SHEET	600.9	683.0
GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET	0.0	0.0
NET AMOUNT	600.9	683.0
Total Derivatives Not Subject to a Master Netting Arrangement
Total Derivatives Not Subject to a Master Netting Arrangement	843.5	1,105.2
Total Derivatives
GROSS RECOGNIZED LIABILITIES	3,649.8	3,654.1
Derivative Liabilities	1,444.4	1,788.2
NET AMOUNT	1,444.4	1,788.2
Securities Sold under Agreements to Repurchase
GROSS RECOGNIZED LIABILITIES	62,860.2	11,991.1
GROSS AMOUNTS OFFSET IN THE BALANCE SHEET	62,075.5	11,423.9
NET AMOUNTS PRESENTED IN THE BALANCE SHEET	784.7	567.2
GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET	784.7	567.2
NET AMOUNT	0.0	0.0
Other liabilities	4,000.0	3,200.0
Foreign Exchange Contracts | Over the Counter Derivative
Total Derivatives Subject to a Master Netting Arrangement
GROSS RECOGNIZED LIABILITIES	2,411.7	2,082.3
GROSS AMOUNTS OFFSET IN THE BALANCE SHEET	2,175.7	1,826.7
NET AMOUNTS PRESENTED IN THE BALANCE SHEET	236.0	255.6
GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET	0.0	0.0
NET AMOUNT	236.0	255.6
Interest Rate Swaps | Over the Counter Derivative
Total Derivatives Subject to a Master Netting Arrangement
GROSS RECOGNIZED LIABILITIES	368.3	426.5
GROSS AMOUNTS OFFSET IN THE BALANCE SHEET	6.0	5.9
NET AMOUNTS PRESENTED IN THE BALANCE SHEET	362.3	420.6
GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET	0.0	0.0
NET AMOUNT	362.3	420.6
Interest Rate Swaps | Interest Rate Swaps Exchange Cleared
Total Derivatives Subject to a Master Netting Arrangement
GROSS RECOGNIZED LIABILITIES	0.9	5.3
GROSS AMOUNTS OFFSET IN THE BALANCE SHEET	0.0	0.0
NET AMOUNTS PRESENTED IN THE BALANCE SHEET	0.9	5.3
GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET	0.0	0.0
NET AMOUNT	0.9	5.3
Other Financial Derivatives | Other Financial Derivatives
Total Derivatives Subject to a Master Netting Arrangement
GROSS RECOGNIZED LIABILITIES	25.4	34.8
GROSS AMOUNTS OFFSET IN THE BALANCE SHEET	23.7	33.3
NET AMOUNTS PRESENTED IN THE BALANCE SHEET	1.7	1.5
GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET	0.0	0.0
NET AMOUNT	$ 1.7	$ 1.5

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Offsetting of Assets and Liabilities - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Gross amounts not offset in the balance sheet, received from	$ 12.2	$ 5.0
Gross amounts not offset in the balance sheet, deposited	0.0	0.0
Aggregate fair value of all derivative instruments with credit-risk-related contingent features that are in a liability position	1,200.0	190.9
Collateral deposited with derivative counterparties for derivatives instruments with credit-risk-related contingent features that are in a liability position	1,100.0	55.1
Assets needed for immediate settlement, aggregate fair value	52.2	135.8
Net Investment Hedges
Derivative [Line Items]
Gross amounts not offset in the balance sheet, received from	373.1
Gross amounts not offset in the balance sheet, deposited	$ 21.3
Cash collateral received from derivative counterparties not offset against derivative assets		131.8
Cash collateral deposited with derivative counterparties not offset against derivative liabilities		$ 26.3

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Variable Interest Entities - Narrative (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Investment company, voluntary fee waived	$ 8,800,000	$ 64,200,000
Investment company, financial support to investee contractually required, amount	0
Unfunded commitments	0	0
Fair value, investments, entities that calculate net asset value per share, seed capital investments		19,900,000
Tax Credit Structures
Variable Interest Entity [Line Items]
Affordable housing tax credits and other tax benefits	$ 113,900,000	$ 99,100,000

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Variable Interest Entities (Summary) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Variable Interest Entity [Line Items]
Assets	$ 150,783.1	$ 155,036.7	$ 183,889.8
Liabilities	138,885.2	143,777.2
Other Assets
Variable Interest Entity [Line Items]
Investment Carrying Amount	889.1	904.3
Other Assets | Affordable Housing
Variable Interest Entity [Line Items]
Investment Carrying Amount	622.8	635.9
Other Assets | Other Community Development
Variable Interest Entity [Line Items]
Investment Carrying Amount	266.3	268.4
Other Liabilities
Variable Interest Entity [Line Items]
Unfunded Commitments	178.8	218.9
Other Liabilities | Affordable Housing
Variable Interest Entity [Line Items]
Unfunded Commitments	178.8	218.9
Other Liabilities | Other Community Development
Variable Interest Entity [Line Items]
Unfunded Commitments	0.0	0.0
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Assets	857.0	867.2
Liabilities	$ 172.0	$ 210.1

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Pledged Assets, Accepted Collateral and Restricted Assets - Narrative (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Financial Instruments Owned and Pledged as Collateral [Line Items]
Cash, held in foreign currency	$ 722,200,000	$ 330,400,000
Restricted cash	575,200,000	574,200,000
Average deposits maintained to meet Federal Reserve Bank reserve requirements	0	0
Debt Securities And Loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral that may be repledged or sold	$ 1,100,000,000	$ 453,900,000

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Pledged Assets, Accepted Collateral and Restricted Assets (Type of Pledged Assets) (Details) - Collateral that may be repledged or sold - USD ($) $ in Billions	Dec. 31, 2023	Dec. 31, 2022
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total Pledged Assets	$ 43.3	$ 43.2
Debt Securities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total Pledged Assets	33.0	31.4
Loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total Pledged Assets	$ 10.3	$ 11.8

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Pledged Assets, Accepted Collateral and Restricted Assets - Accepted Collateral (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]
Total Collateral Accepted	$ 62,780.0	$ 12,574.4
Fair value of securities received as collateral that have been resold or repledged	62,000.0	11,500.0
Reverse repurchase agreements
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]
Collateral that may be repledged or sold	62,767.8	12,119.4
Collateral that may not be repledged or sold	0.0	450.0
Derivative contracts
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]
Collateral that may be repledged or sold	$ 12.2	$ 5.0

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Restrictions on Subsidiary Dividends and Loans or Advances (Details) $ in Billions	Dec. 31, 2023 USD ($)
Banking and Thrift, Other Disclosure [Abstract]
Statutory accounting practices, statutory amount available for dividend payments without regulatory approval	$ 1.5

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Reporting Segments and Related Information - Narrative (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting [Abstract]
Number of client-focused reportable segment | segment	2
Segment reporting information, fully taxable-equivalent adjustment | $	$ 57.5	$ 45.6	$ 35.6

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Reporting Segments and Related Information - Earnings Contribution of Northern Trust's Reporting Segments (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Noninterest Income
Trust, Investment and Other Servicing Fees	$ 4,361.8	$ 4,432.6	$ 4,361.1
Foreign Exchange Trading Income	203.9	288.6	292.6
Other Noninterest Income	225.8	152.8	428.1
Total Noninterest Income	4,791.5	4,874.0	5,081.8
Net Interest Income	1,982.0	1,887.2	1,382.7
Revenue	6,773.5	6,761.2	6,464.5
Provision for Credit Losses	24.5	12.0	(81.5)
Noninterest Expense	5,284.2	4,982.9	4,535.9
Income (Loss) before Income Taxes	1,464.8	1,766.3	2,010.1
Provision (Benefit) for Income Taxes	357.5	430.3	464.8
NET INCOME	1,107.3	1,336.0	1,545.3
Corporate, Non-Segment
Noninterest Income
Total Noninterest Income	(188.4)	(235.6)	(21.3)
Net Interest Income	0.0	0.0	0.0
Revenue	(188.4)	(235.6)	(21.3)
Noninterest Expense	128.7	74.7	21.8
Income (Loss) before Income Taxes	(317.1)	(310.3)	(43.1)
Provision (Benefit) for Income Taxes	(18.0)	(77.3)	(10.7)
NET INCOME	$ (299.1)	$ (233.0)	$ (32.4)
Percentage of Consolidated Net Income	(27.00%)	(17.00%)	(2.00%)
Average Assets	$ 0.0	$ 0.0	$ 0.0
Segment Reconciling Items
Noninterest Income
Average Assets	142,649.2	152,551.9	156,363.2
Corporate and Institutional Services Results of Operations | Operating Segments
Noninterest Income
Trust, Investment and Other Servicing Fees	2,461.9	2,496.3	2,487.3
Foreign Exchange Trading Income	213.0	281.0	279.0
Other Noninterest Income	263.4	250.7	261.2
Total Noninterest Income	2,938.3	3,028.0	3,027.5
Net Interest Income	1,197.3	1,072.7	637.2
Revenue	4,135.6	4,100.7	3,664.7
Provision for Credit Losses	0.5	2.4	(33.8)
Noninterest Expense	3,273.2	3,092.7	2,863.0
Income (Loss) before Income Taxes	861.9	1,005.6	835.5
Provision (Benefit) for Income Taxes	187.1	243.2	194.1
NET INCOME	$ 674.8	$ 762.4	$ 641.4
Percentage of Consolidated Net Income	61.00%	57.00%	41.00%
Average Assets	$ 101,472.6	$ 115,646.4	$ 120,883.2
Wealth Management | Operating Segments
Noninterest Income
Trust, Investment and Other Servicing Fees	1,899.9	1,936.3	1,873.8
Foreign Exchange Trading Income	(9.1)	7.6	13.6
Other Noninterest Income	150.8	137.7	188.2
Total Noninterest Income	2,041.6	2,081.6	2,075.6
Net Interest Income	842.2	860.1	781.1
Revenue	2,883.8	2,941.7	2,856.7
Provision for Credit Losses	24.0	9.6	(47.7)
Noninterest Expense	1,882.3	1,815.5	1,651.1
Income (Loss) before Income Taxes	977.5	1,116.6	1,253.3
Provision (Benefit) for Income Taxes	245.9	310.0	317.0
NET INCOME	$ 731.6	$ 806.6	$ 936.3
Percentage of Consolidated Net Income	66.00%	60.00%	61.00%
Average Assets	$ 41,176.6	$ 36,905.5	$ 35,480.0

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Reporting Segments and Related Information - Distribution of Total Assets and Operating Performance (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
TOTAL ASSETS	$ 150,783.1	$ 155,036.7	$ 183,889.8
TOTAL REVENUE	6,773.5	6,761.2	6,464.5
INCOME BEFORE INCOME TAXES	1,464.8	1,766.3	2,010.1
NET INCOME	$ 1,107.3	$ 1,336.0	$ 1,545.3
TOTAL ASSETS | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	100.00%	100.00%	100.00%
TOTAL REVENUE | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	100.00%	100.00%	100.00%
INCOME BEFORE INCOME TAXES | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	100.00%	100.00%	100.00%
NET INCOME | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	100.00%	100.00%	100.00%
Non-U.S.
Segment Reporting Information [Line Items]
TOTAL ASSETS	$ 39,661.5	$ 35,991.3	$ 38,555.3
TOTAL REVENUE	2,156.1	2,273.3	2,017.5
INCOME BEFORE INCOME TAXES	473.7	560.9	569.4
NET INCOME	$ 354.0	$ 420.2	$ 426.7
Non-U.S. | TOTAL ASSETS | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	26.00%	23.00%	21.00%
Non-U.S. | TOTAL REVENUE | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	32.00%	34.00%	31.00%
Non-U.S. | INCOME BEFORE INCOME TAXES | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	32.00%	32.00%	28.00%
Non-U.S. | NET INCOME | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	32.00%	31.00%	28.00%
U.S.
Segment Reporting Information [Line Items]
TOTAL ASSETS	$ 111,121.6	$ 119,045.4	$ 145,334.5
TOTAL REVENUE	4,617.4	4,487.9	4,447.0
INCOME BEFORE INCOME TAXES	991.1	1,205.4	1,440.7
NET INCOME	$ 753.3	$ 915.8	$ 1,118.6
U.S. | TOTAL ASSETS | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	74.00%	77.00%	79.00%
U.S. | TOTAL REVENUE | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	68.00%	66.00%	69.00%
U.S. | INCOME BEFORE INCOME TAXES | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	68.00%	68.00%	72.00%
U.S. | NET INCOME | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	68.00%	69.00%	72.00%

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Regulatory Capital Requirements - Risk-Based Capital Amounts and Ratios (Detail) $ in Millions	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
STANDARDIZED APPROACH | Parent Company
Tier 1 Capital
BALANCE	$ 11,023.9	$ 10,397.4
RATIO	0.123	0.118
Minimum to qualify as well-capitalized balance	$ 5,371.6	$ 5,286.5
Minimum to qualify as well-capitalized ratio	0.060	0.060
Total Capital
BALANCE	$ 12,733.9	$ 12,245.5
RATIO	0.142	0.139
Minimum to qualify as well-capitalized balance	$ 8,952.7	$ 8,810.8
Minimum to qualify as well-capitalized ratio	0.100	0.100
Leverage (Tier 1 Capital to Adjusted Average Fourth Quarter Assets)
BALANCE	$ 11,023.9	$ 10,397.4
RATIO	0.081	0.071
STANDARDIZED APPROACH | Parent Company | Common Stock
Tier 1 Capital
BALANCE	$ 10,179.4	$ 9,539.7
RATIO	0.114	0.108
STANDARDIZED APPROACH | The Northern Trust Company
Tier 1 Capital
BALANCE	$ 10,806.2	$ 10,111.2
RATIO	0.122	0.116
Minimum to qualify as well-capitalized balance	$ 7,099.5	$ 6,996.2
Minimum to qualify as well-capitalized ratio	0.080	0.080
Total Capital
BALANCE	$ 12,279.3	$ 11,766.8
RATIO	0.138	0.135
Minimum to qualify as well-capitalized balance	$ 8,874.4	$ 8,745.3
Minimum to qualify as well-capitalized ratio	0.100	0.100
Leverage (Tier 1 Capital to Adjusted Average Fourth Quarter Assets)
BALANCE	$ 10,806.2	$ 10,111.2
RATIO	0.080	0.069
Minimum to qualify as well-capitalized balance	$ 6,764.0	$ 7,323.8
Minimum to qualify as well-capitalized ratio	0.050	0.050
STANDARDIZED APPROACH | The Northern Trust Company | Common Stock
Tier 1 Capital
BALANCE	$ 10,806.2	$ 10,111.2
RATIO	0.122	0.116
Minimum to qualify as well-capitalized balance	$ 5,768.4	$ 5,684.4
Minimum to qualify as well-capitalized ratio	0.065	0.065
ADVANCED APPROACH | Parent Company
Tier 1 Capital
BALANCE	$ 11,023.9	$ 10,397.4
RATIO	0.145	0.125
Minimum to qualify as well-capitalized balance	$ 4,558.8	$ 4,990.9
Minimum to qualify as well-capitalized ratio	0.060	0.060
Total Capital
BALANCE	$ 12,514.7	$ 12,045.9
RATIO	0.165	0.145
Minimum to qualify as well-capitalized balance	$ 7,598.0	$ 8,318.1
Minimum to qualify as well-capitalized ratio	0.100	0.100
Leverage (Tier 1 Capital to Adjusted Average Fourth Quarter Assets)
BALANCE	$ 11,023.9	$ 10,397.4
RATIO	0.081	0.071
Supplementary Leverage Capital [Abstract]
Supplementary leverage capital	$ 11,023.9	$ 10,397.4
Supplementary leverage capital to average assets	8.60%	7.90%
ADVANCED APPROACH | Parent Company | Common Stock
Tier 1 Capital
BALANCE	$ 10,179.4	$ 9,539.7
RATIO	0.134	0.115
ADVANCED APPROACH | The Northern Trust Company
Tier 1 Capital
BALANCE	$ 10,806.2	$ 10,111.2
RATIO	0.146	0.124
Minimum to qualify as well-capitalized balance	$ 5,918.3	$ 6,506.1
Minimum to qualify as well-capitalized ratio	0.080	0.080
Total Capital
BALANCE	$ 12,060.2	$ 11,567.2
RATIO	0.163	0.142
Minimum to qualify as well-capitalized balance	$ 7,397.9	$ 8,132.6
Minimum to qualify as well-capitalized ratio	0.100	0.100
Leverage (Tier 1 Capital to Adjusted Average Fourth Quarter Assets)
BALANCE	$ 10,806.2	$ 10,111.2
RATIO	0.080	0.069
Minimum to qualify as well-capitalized balance	$ 6,764.0	$ 7,323.8
Minimum to qualify as well-capitalized ratio	0.050	0.050
Supplementary Leverage Capital [Abstract]
Supplementary leverage capital	$ 10,806.2	$ 10,111.2
Supplementary leverage capital to average assets	8.50%	7.70%
Supplementary leverage capital required to be well capitalized	$ 3,825.6	$ 3,931.5
Supplementary leverage ratio	0.030	0.030
ADVANCED APPROACH | The Northern Trust Company | Common Stock
Tier 1 Capital
BALANCE	$ 10,806.2	$ 10,111.2
RATIO	0.146	0.124
Minimum to qualify as well-capitalized balance	$ 4,808.6	$ 5,286.2
Minimum to qualify as well-capitalized ratio	0.065	0.065

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Northern Trust Corporation (Corporation only) - Condensed Balance Sheet (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
ASSETS
Cash on Deposit with Subsidiary Bank	$ 4,791.5	$ 4,654.2
Other Assets	10,788.4	9,855.2
Total Assets	150,783.1	155,036.7	$ 183,889.8
LIABILITIES
Senior Notes	2,773.2	2,724.2
Other Liabilities	5,485.1	4,998.3
Total Liabilities	138,885.2	143,777.2
STOCKHOLDERS' EQUITY
Common Stock	408.6	408.6
Additional Paid-In Capital	1,009.6	983.5
Retained Earnings	14,233.8	13,798.5
Accumulated Other Comprehensive Loss	(1,137.9)	(1,569.2)
Treasury Stock	(3,501.1)	(3,246.8)
Total Stockholders’ Equity	11,897.9	11,259.5	12,016.8	$ 11,688.3
Total Liabilities and Stockholders’ Equity	150,783.1	155,036.7
Parent Company
ASSETS
Cash on Deposit with Subsidiary Bank	795.5	601.4	$ 1,731.7	$ 2,516.0
Other Assets	1,233.1	1,226.3
Total Assets	17,589.7	16,929.5
LIABILITIES
Senior Notes	2,773.2	2,724.2
Long-Term Debt	2,065.0	2,066.2
Other Liabilities	853.6	879.6
Total Liabilities	5,691.8	5,670.0
STOCKHOLDERS' EQUITY
Preferred Stock	884.9	884.9
Common Stock	408.6	408.6
Additional Paid-In Capital	1,009.6	983.5
Retained Earnings	14,233.8	13,798.5
Accumulated Other Comprehensive Loss	(1,137.9)	(1,569.2)
Treasury Stock	(3,501.1)	(3,246.8)
Total Stockholders’ Equity	11,897.9	11,259.5
Total Liabilities and Stockholders’ Equity	17,589.7	16,929.5
Parent Company | Banks Industry
ASSETS
Advances to Wholly-Owned Subsidiaries – Banks	3,760.0	4,010.0
Investments in Wholly-Owned Subsidiaries	11,591.4	10,897.1
Parent Company | Nonbank Subsidiaries
ASSETS
Investments in Wholly-Owned Subsidiaries	$ 209.7	$ 194.7

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Northern Trust Corporation (Corporation only) - Condensed Statement of Income (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
OPERATING INCOME
Total Operating Income	$ 6,773.5	$ 6,761.2	$ 6,464.5
OPERATING EXPENSES
Interest Expense	5,343.0	990.5	23.8
Other Operating Expenses	472.9	359.3	299.1
Total Noninterest Expense	5,284.2	4,982.9	4,535.9
Benefit for Income Taxes	(357.5)	(430.3)	(464.8)
NET INCOME	1,107.3	1,336.0	1,545.3
Preferred Stock Dividends	41.8	41.8	41.8
Net Income Applicable to Common Stock	1,065.5	1,294.2	1,503.5
Parent Company
OPERATING INCOME
Intercompany Interest and Other Charges	260.2	112.8	20.1
Interest and Other Income	12.2	(5.7)	32.3
Total Operating Income	1,122.4	107.1	811.8
OPERATING EXPENSES
Interest Expense	279.5	132.3	71.3
Other Operating Expenses	32.3	11.9	36.7
Total Noninterest Expense	311.8	144.2	108.0
Income (Loss) before Income Taxes and Equity in Undistributed Net Income of Subsidiaries	810.6	(37.1)	703.8
Benefit for Income Taxes	12.4	16.9	25.7
Income (Loss) before Equity in Undistributed Net Income of Subsidiaries	823.0	(20.2)	729.5
Equity in Undistributed Net Income of Subsidiaries	284.3	1,356.2	815.8
NET INCOME	1,107.3	1,336.0	1,545.3
Preferred Stock Dividends	41.8	41.8	41.8
Net Income Applicable to Common Stock	1,065.5	1,294.2	1,503.5
Banks Industry | Parent Company
OPERATING INCOME
Dividends from Subsidiaries	850.0	0.0	751.1
OPERATING EXPENSES
Equity in Undistributed Net Income of Subsidiaries	269.4	1,338.5	803.3
Nonbank Subsidiaries | Parent Company
OPERATING INCOME
Dividends from Subsidiaries	0.0	0.0	8.3
OPERATING EXPENSES
Equity in Undistributed Net Income of Subsidiaries	$ 14.9	$ 17.7	$ 12.5

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Northern Trust Corporation (Corporation only) - Condensed Statement of Cash Flows (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	$ 1,107.3	$ 1,336.0	$ 1,545.3
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Change in Accrued Income Taxes	(44.4)	61.3	37.2
Other Operating Activities, net	774.5	(333.7)	183.8
Net Cash Provided by Operating Activities	2,625.6	2,392.4	1,356.0
CASH FLOWS FROM INVESTING ACTIVITIES
Other Investing Activities, net	(1,539.0)	(319.3)	(163.7)
Net Cash Provided by (Used in) Investing Activities	4,784.1	25,929.8	(18,602.6)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from Senior Notes	0.0	1,988.8	0.0
Repayments of Senior Notes	0.0	(500.0)	(500.0)
Repayment of Floating Rate Capital Debt	0.0	0.0	(278.8)
Treasury Stock Purchased	(347.5)	(35.4)	(267.6)
Net Proceeds from Stock Options	2.3	3.9	53.8
Cash Dividends Paid on Common Stock	(621.5)	(750.2)	(583.3)
Cash Dividends Paid on Preferred Stock	(41.8)	(46.5)	(41.8)
Other Financing Activities, net	(2.7)	0.0	0.1
Net Cash (Used in) Provided by Financing Activities	(7,182.6)	(26,437.4)	16,073.5
Change in Cash and Due from Banks	137.3	1,597.4	(1,332.7)
Cash on Deposit with Subsidiary Bank at Beginning of Year	4,654.2
Cash on Deposit with Subsidiary Bank at End of Year	4,791.5	4,654.2
Parent Company
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	1,107.3	1,336.0	1,545.3
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Equity in Undistributed Net Income of Subsidiaries	(284.3)	(1,356.2)	(815.8)
Change in Prepaid Expenses	1.7	(3.8)	0.1
Change in Accrued Income Taxes	(10.2)	36.6	2.2
Other Operating Activities, net	138.1	(608.2)	236.6
Net Cash Provided by Operating Activities	952.6	(595.6)	968.4
CASH FLOWS FROM INVESTING ACTIVITIES
Investments in and Advances to Subsidiaries, net	250.0	(1,200.1)	(140.0)
Other Investing Activities, net	0.0	(0.1)	5.1
Net Cash Provided by (Used in) Investing Activities	250.0	(1,200.2)	(134.9)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from Senior Notes	0.0	1,988.8	0.0
Repayments of Senior Notes	0.0	(500.0)	(500.0)
Repayment of Floating Rate Capital Debt	0.0	0.0	(278.8)
Treasury Stock Purchased	(347.5)	(35.4)	(267.6)
Net Proceeds from Stock Options	2.3	3.9	53.8
Cash Dividends Paid on Common Stock	(621.5)	(750.2)	(583.3)
Cash Dividends Paid on Preferred Stock	(41.8)	(46.5)	(41.8)
Other Financing Activities, net	0.0	4.9	(0.1)
Net Cash (Used in) Provided by Financing Activities	(1,008.5)	665.5	(1,617.8)
Change in Cash and Due from Banks	194.1	(1,130.3)	(784.3)
Cash on Deposit with Subsidiary Bank at Beginning of Year	601.4	1,731.7	2,516.0
Cash on Deposit with Subsidiary Bank at End of Year	$ 795.5	$ 601.4	$ 1,731.7

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Subsequent Events (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	Jan. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Feb. 27, 2024
Subsequent Event [Line Items]
Debt securities, available-for-sale, realized loss		$ 176.4	$ (6.9)	$ 169.5	$ 214.0	$ 0.3
Subsequent Event
Subsequent Event [Line Items]
Debt securities, available-for-sale, sold	$ 2,200.0
Debt securities, available-for-sale, realized loss	$ 189.4
Subsequent Event | Debt Securities
Subsequent Event [Line Items]
Deferred (gain) loss on discontinuation of fair value hedge							$ 18.4