TrustCo Bank Corp NY2024 annual meeting of shareholders Robert J. McCormick Chairman, President, and CEO

TrustCo Bank Corp NY 2 Company Profile Assets: $6.2bn Gross Loans: $5.01bn Deposits: $5.4bn Q1 2024 Financial Highlights Company Overview Headquarters Glenville, NY Founded 1902 Ticker NASDAQ: TRST Market Cap(1) 524m Branches(2) 139 Employees 808 Institutional Ownership 68.71% Leadership: Chairman, President, and CEO Robert J. McCormick Note: Data as of 12/31/2023 unless noted: Market Cap as of 5/1/2024 Branches as of 5/1/2024 Trustco Bank is a member of the Allpoint and Publix Super Market ATM networks Lines of Business Consumer Banking Consumer Commercial Banking Other Services Retail Banking with 139 branch locations Access to over 55,000 ATMs worldwide(4) Online and Mobile Banking Home Lending Personal Lending Treasury Services Consumer loans Commercial Lending Business Banking Small Business Administration Lending Wealth Management Advisory Services Fiduciary Services Retirement Services Florida deposits and loans: $1bn TrustCo Bank Corp NY Annual Meeting 2024

Longevity of our Branches Mont Pleasant, NY Brandywine, NY Upper Union, NY Mayfair, NY Troy, NY 122 Years Strong Main Office: 1902

4 Q1 2024 Performance Highlights 2.44% Net Interest Margin (YTD) 5.2% Loan Growth (since Q1 2023) 0.37% NPLs to Total Loans $34.12 Book Value Quarterly loan growth of $130.6 million, or 2.7%, year over year loan growth of $249.4 million, or 5.2%. Loan portfolio continues to reach new highs, quarter after quarter. Continued strong asset quality. TRST had seven consecutive quarters of net recoveries from 2022-2023, and again in Q1 2024. Capital continues to grow. Consolidated equity to assets increased to 10.51%, an increase of 3.3% since March 31, 2023. Book value was $34.12, up $1.81 since Q1 2023. Net income of $12.1 million, up from $9.8 million in Q4 2023. ROAA and ROAE improvement from Q4 2023: 0.80% up from 0.64%, and 7.54% up from 6.21%, respectively. First Quarter 2024: TrustCo Bank Corp NY Annual Meeting 2024

Consistent, Organic, Loan Growth 5 5.5% annualized growth since 2010, and an 5.2% increase since the first quarter of 2023 TrustCo Bank Corp NY Annual Meeting 2024

Consistently Strong Credit Quality Compared to Peers Source: S&P Capital IQ 6 Net Charge-Offs (Recoveries) / Average Loans TrustCo booked another quarter of net recoveries in the first quarter of 2024. This follows a trend of seven consecutive quarters of net recoveries from 2022 – 2023. 1 See slide 10 for a list of the companies that comprise TrustCo’s peer group. TrustCo Bank Corp NY Annual Meeting 2024

As of December 31, 2023 TrustCo Bank Corp NY 7 Strong Capital Levels Compared to Peers Common Equity Tier 1 Ratio: TRST consistently outranks its peer group in strength of Capital (%) TrustCo Bank Corp NY Annual Meeting 2024

TrustCo Bank Corp NY Annual Meeting 2024 8 Increases shown are a percent change from prior amount. Source: Blooomberg Reliable Dividends Paid to our Shareholders Since 1904 $755 million paid in dividends to shareholders since 2000 TRST’s dividend yield ranks in the top 90th percentile of its peer group, and the 78th percentile of all U.S. public companies

TrustCo in the Community TrustCo Bank Corp NY Annual Meeting 2024 9 The Schenectady Foundation’s 60th Anniversary Honoring Trustco Bank’s Home Town Heroes Regional Food Bank of NENY FHA Loan Closing Joseph’s House and Shelter (Troy, NY) Habitat for Humanity

Questions? 10 Thank you for Attending

11 Peer Group Institution Ticker City State Arrow Financial Corp. AROW Glens Falls NY BCB Bancorp Inc. BCBP Bayonne NJ Capital City Bank Group Inc. CCBG Tallahassee FL CNB Financial CCNE Clearfield PA ConnectOne Bancorp Inc. CNOB Englewood Cliffs NJ Financial Institutions Inc. FISI Warsaw NY First Commonwealth Financial FCF Indiana PA Flushing Financial Corp. FFIC Uniondale NY HarborOne Bancorp Inc HONE Brockton MA Kearny Financial Corp. KRNY Fairfield NJ Lakeland Bancorp LBAI Oak Ridge NJ Mid Penn Bancrop MPB Millersburg PA NBT Bancorp Inc. NBTB Norwich NY Northfield Bncp (Staten Island NFBK Woodbridge NJ S&T Bancorp STBA Indiana PA Seacoast Banking Corp. of FL SBCF Stuart FL The First Long Island Corp. FLIC Glen Head NY Tompkins Financial Corporation TMP Ithaca NY Univest Financial Corp. UVSP Souderton PA

Appendix A Forward-Looking Statements All statements in this presentation that are not historical are forward-looking statements within the meaning of the “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995. Forward-looking statements can be identified by words such as "anticipate," "intend," "plan," "goal," "seek," "believe," "project," "estimate," "expect," "strategy," "future," "likely," "may," "should," "will" and similar references to future development, results or periods. Examples of forward-looking statements include, among others, statements we make regarding our expectations for our future performance, [including our expectations regarding the effects of the economic environment on our financial results, our ability to retain customers and the amount of customers’ business, including deposit balances, with us, the impact of the Federal Reserve’s actions regarding interest rates,] the growth of loans and deposits throughout our branch network, [and] our dividend and capital growth[, and our ability to capitalize on economic changes in the areas in which we operate]. Forward-looking statements are based on management’s current expectations as well as certain assumptions and estimates made by, and information available to, management at the time the statements are made. Such forward-looking statements are subject to factors and uncertainties that could cause actual results to differ materially for TrustCo from the views, beliefs and projections expressed in such statements, and many of the risks and uncertainties are heightened by or may, in the future, be heightened by volatility in financial markets and macroeconomic or geopolitical concerns related to inflation, continued elevated interest rates and ongoing armed conflicts (including the Russia/Ukraine conflict and the conflict in Israel and surrounding areas). TrustCo wishes to caution readers not to place undue reliance on any such forward-looking statements, which speak only as of the date made. The following important factors, among others, in some cases have affected and in the future could affect TrustCo’s actual results and could cause TrustCo’s actual financial performance to differ materially from that expressed in any forward-looking statement: future changes in interest rates; ongoing inflationary pressures and continued elevated prices; exposure to credit risk in our lending activities; our increasing commercial loan portfolio; the sufficiency of our allowance for credit losses on loans to cover actual loan losses; our ability to meet the cash flow requirements of our depositors or borrowers or meet our operating cash needs to fund corporate expansion and other activities; claims and litigation pertaining to fiduciary responsibility and lender liability; our dependency upon the services of the management team; our disclosure controls and procedures’ ability to prevent or detect errors or acts of fraud; the adequacy of our business continuity and disaster recovery plans; the effectiveness of our risk management framework; the impact of any expansion by us into new lines of business or new products and services; the impact of severe weather events and climate change on us and the communities we serve, including societal responses to climate change; increasing scrutiny and evolving expectations from customers, regulators, investors, and other stakeholders with respect to our environmental, social and governance practices; the chance of a prolonged economic downturn, especially one affecting our geographic market area; instability in global economic conditions and geopolitical matters, as well as volatility in financial markets; the soundness of other financial institutions; U.S. government shutdowns, credit rating downgrades, or failure to increase the debt ceiling; fluctuations in the trust wealth management fees we receive as a result of investment performance; the impact of regulatory capital rules on our growth; changes in laws and regulations, including changes in cybersecurity or privacy regulations; restrictions on data collection and use; our compliance with the USA PATRIOT Act, Bank Secrecy Act, and other laws and regulations that could result in material fines or sanctions; changes in tax laws; limitations on our ability to pay dividends; TrustCo Realty Corp.’s ability to qualify as a real estate investment trust; changes in accounting standards; competition within our market areas; consumers and businesses’ use of non-banks to complete financial transactions; our reliance on third-party service providers; the impact of data breaches and cyber-attacks; the impact of a failure in or breach of our operational or security systems or infrastructure, or those of third parties; the impact of an unauthorized disclosure of sensitive or confidential client or customer information; the impact of interruptions in the effective operation of our computer systems; the impact of anti-takeover provisions in our organizational documents; the impact of the manner in which we allocate capital; and other risks and uncertainties under the heading “Risk Factors” in our most recent annual report on Form 10-K and, if any, in our subsequent quarterly reports on Form 10-Q or other securities filings. The forward-looking statements contained in this presentation represent TrustCo management’s judgment as of the date of this presentation. TrustCo disclaims, however, any intent or obligation to update forward-looking statements, either as a result of future developments, new information or otherwise, except as may be required by law.