10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

_______________________________________________  

FORM 10-Q

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

FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2017

OR

¨

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

000-54991

Commission File Number

KCG HOLDINGS, INC.

(Exact name of registrant as specified in its charter)

DELAWARE

(State or other jurisdiction of incorporation or organization)

38-3898306

(I.R.S. Employer Identification Number)

300 Vesey Street, New York, NY 10282

(Address of principal executive offices and zip code)

Registrant’s telephone number, including area code: (646) 682-6000

_______________________________________________ 

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

Title of each class	Name of each exchange on which registered
Class A Common Stock, $0.01 par value	New York Stock Exchange

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

_______________________________________________ 

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  x    No ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted 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 and post such files).    Yes  x    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	ý	Accelerated filer	¨
Non-accelerated filer	¨	Smaller reporting company	¨
Emerging growth 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 is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  ý

Indicate the number of shares outstanding of each of the issuer's classes of common stock, as of the latest predictable date:

At May 4, 2017, the number of shares outstanding of the Registrant’s Class A Common Stock was 67,630,780 (including restricted stock units) and there were no shares outstanding of the Registrant’s Class B Common Stock or Preferred Stock.

KCG HOLDINGS, INC.

FORM 10-Q QUARTERLY REPORT

For the Quarter Ended March 31, 2017

TABLE OF CONTENTS

		Page
PART I	FINANCIAL INFORMATION:
Item 1.	Financial Statements (Unaudited)	3
	Consolidated Statements of Operations	3
	Consolidated Statements of Comprehensive Income	4
	Consolidated Statements of Financial Condition	5
	Consolidated Statement of Changes in Equity	6
	Consolidated Statements of Cash Flows	7
	Notes to Consolidated Financial Statements	8
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	42
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	55
Item 4.	Controls and Procedures	59
PART II	OTHER INFORMATION:
Item 1.	Legal Proceedings	60
Item 1A.	Risk Factors	60
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	62
Item 3.	Defaults Upon Senior Securities	62
Item 4.	Mine Safety Disclosures	62
Item 5.	Other Information	62
Item 6.	Exhibits	63
Signatures

2

PART I FINANCIAL INFORMATION

Item 1. Financial Statements (Unaudited)

KCG HOLDINGS, INC.

CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited)

	For the three months ended March 31,
	2017			2016
	(In thousands, except per share amounts)
Revenues
Trading revenues, net	$	154,307		$	223,938
Commissions and fees	93,589			106,101
Interest, net	821			117
Investment income and other, net	6,656			15,268
Total revenues	255,373			345,424
Expenses
Employee compensation and benefits	66,003			97,586
Execution and clearance fees	72,795			73,634
Communications and data processing	39,020			35,657
Depreciation and amortization	19,038			21,905
Payments for order flow	17,121			12,655
Collateralized financing interest	11,761			9,163
Debt interest expense	9,330			9,492
Occupancy and equipment rentals	6,760			8,990
Professional fees	4,544			6,057
Business development	1,208			1,119
Other	8,197			9,201
Total expenses	255,777			285,459
(Loss) income before income taxes	(404		)	59,965
Income tax (benefit) expense	(3,616		)	22,800
Net income	$	3,212		$	37,165
Basic earnings per share	$	0.05		$	0.42
Diluted earnings per share	$	0.05		$	0.41
Shares used in computation of basic earnings per share	66,306			88,458
Shares used in computation of diluted earnings per share	67,642			89,605

The accompanying notes are an integral part of these consolidated financial statements.

3

KCG HOLDINGS, INC.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)

	For the three months ended March 31,
	2017			2016
	(In thousands)
Net income	$	3,212		$	37,165
Other comprehensive income (loss):
Unrealized gain on available for sale securities, net of tax	170			68
Reclassification of realized gain from Other comprehensive income, net of tax	(2,956		)	—
Cumulative translation adjustment, net of tax	437			(133		)
Comprehensive income	$	863		$	37,100

The accompanying notes are an integral part of these consolidated financial statements.

4

KCG HOLDINGS, INC.

CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION

(Unaudited)

	March 31,			December 31,
	2017			2016
Assets	(In thousands)
Cash and cash equivalents	$	669,869		$	632,234
Cash and cash equivalents segregated under federal and other regulations	3,600			3,000
Financial instruments owned, at fair value, including securities pledged to counterparties that had the right to deliver or repledge of $368,736 at March 31, 2017 and $314,720 at December 31, 2016:
Equities	2,179,211			2,343,033
Debt securities	128,932			177,698
Listed options	12,299			19,100
Other financial instruments	—			30
Total financial instruments owned, at fair value	2,320,442			2,539,861
Collateralized agreements:
Securities borrowed	1,594,442			1,688,222
Receivable from brokers, dealers and clearing organizations	801,678			832,785
Fixed assets and leasehold improvements, less accumulated depreciation and amortization	159,595			151,645
Investments	24,716			30,979
Goodwill and Intangible assets, less accumulated amortization	106,851			100,338
Deferred tax asset, net	109,877			109,861
Assets of business held for sale	—			8,194
Other assets	192,359			164,168
Total assets	$	5,983,429		$	6,261,287
Liabilities and equity
Liabilities
Financial instruments sold, not yet purchased, at fair value:
Equities	$	1,694,374		$	1,821,957
Debt securities	177,168			211,222
Listed options	35,835			12,961
Other financial instruments	598			—
Total financial instruments sold, not yet purchased, at fair value	1,907,975			2,046,140
Collateralized financings:
Securities loaned	459,533			372,631
Financial instruments sold under agreements to repurchase	952,584			1,027,775
Other collateralized financings	50,000			100,000
Total collateralized financings	1,462,117			1,500,406
Payable to brokers, dealers and clearing organizations	495,253			518,900
Payable to customers	52,315			23,580
Accrued compensation expense	36,695			132,406
Accrued expenses and other liabilities	163,343			156,828
Income taxes payable	63,236			71,391
Debt	455,183			454,353
Total liabilities	4,636,117			4,904,004
Equity
Class A Common Stock
Shares authorized: 1,000,000 at March 31, 2017 and December 31, 2016; Shares issued: 91,810 at March 31, 2017 and 90,309 at December 31, 2016; Shares outstanding: 66,665 at March 31, 2017 and 67,192 at December 31, 2016	918			903
Additional paid-in capital	1,457,412			1,439,412
Retained earnings	195,276			192,064
Treasury stock, at cost; 25,145 shares at March 31, 2017 and 23,116 shares at December 31, 2016	(306,192		)	(277,343		)
Accumulated other comprehensive (loss) income	(102		)	2,247
Total equity	1,347,312			1,357,283
Total liabilities and equity	$	5,983,429		$	6,261,287

The accompanying notes are an integral part of these consolidated financial statements.

5

KCG HOLDINGS, INC.

CONSOLIDATED STATEMENT OF CHANGES IN EQUITY

For the three months ended March 31, 2017

(Unaudited)

	Class A Common Stock							Treasury Stock
(in thousands)	Shares	Amount		Additional Paid-In Capital		Retained Earnings		Shares		Amount			Accumulated other comprehensive (loss) income			Total Equity
Balance, December 31, 2016	90,309	$	903	$	1,439,412	$	192,064	(23,116	)	$	(277,343	)	$	2,247		$	1,357,283
KCG Class A Common Stock repurchased	—	$	—	$	—	$	—	(2,029	)	$	(28,849	)	$	—		$	(28,849	)
Stock-based compensation and Options & Warrants exercised	1,501	15		18,000		—		—		—			—			18,015
Unrealized gain on available for sale securities, net of tax	—	—		—		—		—		—			170			170
Reclassification of realized gain from Other comprehensive income, net of tax	—	—		—		—		—		—			(2,956		)	(2,956		)
Cumulative translation adjustment, net of tax	—	—		—		—		—		—			437			437
Net income	—	—		—		3,212		—		—			—			3,212
Balance, March 31, 2017	91,810	$	918	$	1,457,412	$	195,276	(25,145	)	$	(306,192	)	$	(102	)	$	1,347,312

The accompanying notes are an integral part of these consolidated financial statements.

6

KCG HOLDINGS, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	For the three months ended March 31,
	2017			2016
Cash flows from operating activities	(In thousands)
Net income	$	3,212		$	37,165
Adjustments to reconcile Net income to net cash provided by operating activities
Depreciation and amortization	19,038			21,905
Stock and unit-based compensation	2,997			17,110
Realized gain on sale of assets and investments	(4,834		)	(2,798		)
Realized gain on repurchase of debt	—			(3,676		)
Unrealized gain on investments	(117		)	(4,847		)
Other	618			2,750
(Increase) decrease in operating assets
Cash and cash equivalents segregated under federal and other regulations	(600		)	—
Financial instruments owned, at fair value	219,419			(92,151		)
Securities borrowed	93,780			(45,605		)
Receivable from brokers, dealers and clearing organizations	31,107			25,130
Other assets	(34,821		)	13,150
Increase (decrease) in operating liabilities
Financial instruments sold, not yet purchased, at fair value	(138,165		)	(57,943		)
Securities loaned	86,901			63,981
Financial instruments sold under agreements to repurchase	(75,191		)	(45,599		)
Other collateralized financing	(50,000		)	—
Payable to brokers, dealers and clearing organizations	(23,648		)	300,855
Payable to customers	28,735			(5,747		)
Accrued compensation expense	(77,207		)	(81,994		)
Accrued expenses and other liabilities	276			(9,357		)
Income taxes payable	(8,155		)	—
Net cash provided by operating activities	73,345			132,329
Cash flows from investing activities
Cash received from sale of KCG Hotspot	6,492			6,552
Cash received from sale of assets	—			4,970
Cash received from sale of investments and redemptions from investments	7,404			6,534
Purchases of fixed assets and leasehold improvements	(21,776		)	(12,677		)
Capitalization of software development costs	(17,725		)	(9,013		)
Purchases of investments	(869		)	(770		)
Net cash used in investing activities	(26,474		)	(4,404		)
Cash flows from financing activities
Repurchase of 6.875% Senior Secured Notes	—			(30,288		)
Borrowings under capital lease obligations	12,257			—
Principal payments on capital lease obligations	(568		)	(507		)
Cost of common stock repurchased	(28,849		)	(30,667		)
Stock options exercised	2,775			—
Warrants exercised	4,144			—
Cost of warrants repurchased	—			(967		)
Net cash used in financing activities	(10,241		)	(62,429		)
Effect of exchange rate changes on cash and cash equivalents	1,005			261
Increase in cash and cash equivalents	37,635			65,757
Cash and cash equivalents at beginning of period	632,234			581,313
Cash and cash equivalents at end of period	$	669,869		$	647,070
Supplemental disclosure of cash flow information:
Cash paid for interest	$	31,891		$	27,884
Cash paid for income taxes	$	1,535		$	9,955
Non-cash investing activities - Dividend received from joint venture	$	186		$	—
Non-cash investing activities - Compensation capitalized for internal use software that will be paid in a subsequent period	$	1,762		$	—
Non-cash financing activities - Warrants repurchased via GA Swap	$	2,929		$	—

The accompanying notes are an integral part of these consolidated financial statements.

7

KCG HOLDINGS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

1. Organization and Description of the Business

KCG Holdings, Inc. (collectively with its subsidiaries, "KCG" or the "Company") is a leading independent securities firm offering clients a range of services designed to address trading needs across asset classes, product types and time zones. The Company combines advanced technology with specialized client service across market making, agency execution and trading venues and also engages in principal trading via exchange-based electronic market making. KCG has multiple access points to trade global equities, options, fixed income, currencies and commodities via voice or automated execution.

KCG was formed as a result of a strategic business combination (the “2013 Mergers”) of Knight Capital Group, Inc.(“Knight”) and GETCO Holding Company, LLC (“GETCO”) in July 2013.

Pending Merger with Virtu

On April 20, 2017, the Company entered into an Agreement and Plan of Merger (the “Merger Agreement”) with Virtu Financial, Inc., a Delaware corporation (“Virtu”) and Orchestra Merger Sub, Inc., a Delaware corporation and indirect wholly owned subsidiary of Virtu (“Merger Sub”). The Merger Agreement provides for the merger of Merger Sub with and into the Company (the “Merger”), with the Company surviving the Merger as a wholly owned subsidiary of Virtu.

Pursuant to the Merger Agreement, at the effective time of the Merger (the “Effective Time”), each share of Class A common stock of the Company, par value $0.01 per share ("KCG Class A Common Stock"), issued and outstanding immediately prior to the Effective Time (other than (i) Shares owned by Virtu, Merger Sub, any affiliate of Virtu or Merger Sub, or the Company, in each case immediately prior to the Effective Time, and (ii) Shares held by stockholders who have not voted in favor of the Merger and who have properly and validly perfected their statutory rights of appraisal in respect of such Shares in accordance with Section 262 of the Delaware General Corporation Law) will be canceled and converted into the right to receive $20.00 in cash without interest (the “Merger Consideration”), subject to applicable tax withholding. In accordance with the Merger Agreement, all unvested stock-based compensation awards that are outstanding as of immediately prior to the Effective Time shall accelerate and become fully vested and exercisable effective immediately prior to, and contingent upon, the Effective Time.

The respective obligations of the Company, Virtu and Merger Sub to consummate the Merger are subject to the satisfaction or waiver of certain customary conditions, including the adoption of the Merger Agreement by the Company’s stockholders, the receipt of certain required governmental approvals, the absence of any legal prohibitions, the accuracy of the representations and warranties (subject to customary materiality qualifiers) and compliance by the other party with its obligations under the Merger Agreement (subject to customary materiality qualifiers). The consummation of the Merger is not subject to a financing condition.

Concurrently with the execution of the Merger Agreement, Virtu entered into a voting agreement with Jefferies LLC (“Jefferies”), a stockholder of the Company, which requires Jefferies to, among other things, vote all of its shares of KCG Class A Common Stock in favor of adoption of the Merger Agreement.

The Company expects the Merger to close in the third quarter of 2017.

As of March 31, 2017, the Company's operating segments comprised the following: (i) Market Making; (ii) Global Execution Services; and (iii) Corporate and Other.

Market Making

The Market Making segment principally consists of market making in the cash, futures and options markets across global equities, options, fixed income, currencies and commodities. As a market maker, the Company commits capital on a principal basis by offering to buy securities from, or sell securities to, broker dealers, banks and institutions. The Company engages in principal trading in the Market Making segment direct to clients as well as in a supplemental capacity on exchanges, electronic communications networks (“ECNs”) and alternative trading systems (“ATSs”). The Company is an active participant on all major global equity and futures exchanges and also trades on substantially all domestic electronic options exchanges. As a complement to electronic market making, the cash trading business handles specialized orders and also transacts on the OTC Bulletin Board marketplaces operated by the OTC Markets Group Inc. and the Alternative Investment Market of the London Stock Exchange ("AIM").

Global Execution Services

8

KCG HOLDINGS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - CONTINUED

(Unaudited)

The Global Execution Services segment comprises agency-based trading and trading venues, offering execution services in global equities, options, futures and fixed income on behalf of institutions, banks and broker dealers. The Company earns commissions as an agent on behalf of clients as well as between principals to transactions; in addition, the Company will commit capital on behalf of clients as needed. Agency-based, execution-only trading in the segment is done primarily through a variety of access points including: (i) algorithmic trading and order routing in global equities and options; (ii) institutional sales traders executing program, block and riskless principal trades in global equities and exchange traded funds ("ETFs"); (iii) a fixed income ECN that also offers trading applications; and (iv) an ATS for U.S. equities.

In September 2016, the Company completed the acquisition of Neonet Securities AB ("Neonet"). Neonet is an independent agency broker and execution specialist based in Stockholm, Sweden. The results of Neonet, beginning on the date of acquisition, are included in this segment. The Company does not consider this acquisition to be significant.

Corporate and Other

The Corporate and Other segment contains the Company's investments, principally in strategic trading-related opportunities; manages the deployment of capital across the organization; houses executive management functions; and maintains corporate overhead expenses and all other income and expenses that are not attributable to the Company's other segments. The Corporate and Other segment also contains functions that support the Company’s other segments such as self-clearing services, including stock lending activities.

Sales of Businesses

In March 2016, KCG completed the sale of assets related to its retail U.S. options market making business.

In May 2016, KCG completed the sale of its business as an equities designated market maker ("DMM") on the New York Stock Exchange ("NYSE") to Citadel Securities LLC (“Citadel”).

The results of both the retail U.S. options market making business and the DMM business are included in the Market Making segment, up through the date of the respective sales.

See Footnote 3 "Assets of Businesses Held for Sale & Sales of Businesses" for further information.

2. Significant Accounting Policies

Basis of consolidation and form of presentation

The accompanying unaudited Consolidated Financial Statements, prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”), should be read in conjunction with the audited Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016. These unaudited Consolidated Financial Statements include the accounts of the Company and its subsidiaries and reflect all normal and recurring adjustments that are, in the opinion of management, necessary for a fair statement of the results for the interim periods presented. Certain footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to U.S. Securities and Exchange Commission (“SEC”) rules and regulations, although the Company believes that the disclosures herein are adequate to make the information presented not misleading. All significant intercompany transactions and balances have been eliminated. Interim period operating results may not be indicative of the operating results for a full year.

Cash and cash equivalents

Cash and cash equivalents include money market accounts, which are payable on demand, and short-term investments with an original maturity of less than 90 days. The carrying amount of such cash equivalents approximates their fair value due to the short-term nature of these instruments. These assets would be categorized as Level 1 in the fair value hierarchy if they were required to be recorded at fair value.

Cash and cash equivalents segregated under federal and other regulations

The Company maintains custody of customer funds and is obligated by rules and regulations mandated bythe SEC to segregate or set aside cash and/or qualified securities to satisfy these regulations, which have been promulgated to protect customer assets. The amounts recognized as Cash and cash equivalents segregated under federal and other regulations approximate fair value. These assets would be categorized as Level 1 in the fair value hierarchy if they were required to be recorded at fair value.

9

KCG HOLDINGS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - CONTINUED

(Unaudited)

Market making, sales, trading and execution activities

Financial instruments owned and Financial instruments sold, not yet purchased relate to market making and trading activities, and include listed and other equity securities, listed equity options and fixed income securities that are recorded on a trade date basis and are reported at fair value. Such financial instruments are netted by their respective long and short positions by CUSIP/ISIN number. Trading revenues, net, which comprises trading gains, net of trading losses on such financial instruments, are also recorded on a trade date basis.

Commissions, which primarily comprise commission equivalents earned on institutional client orders and volume based fees earned from providing liquidity to other trading venues, as well as related expenses, are also recorded on a trade date basis.

The Company’s third party clearing agreements call for payment or receipt of interest income, net of transaction-related interest charged by such clearing brokers, for facilitating the settlement and financing of securities transactions. Interest income and interest expense which have been netted within Interest, net on the Consolidated Statements of Operations are as follows (in thousands):

	For the three months ended March 31,
	2017			2016
Interest Income	$	3,978		$	3,107
Interest Expense	(3,157		)	(2,990		)
Interest, net	$	821		$	117

Dividend income relating to financial instruments owned and dividend expense relating to financial instruments sold, not yet purchased, are derived primarily from the Company’s market making activities and are included as a component of Trading revenues, net on the Consolidated Statements of Operations. Trading revenues, net includes dividend income and expense as follows (in thousands):

	For the three months ended March 31,
	2017			2016
Dividend Income	$	10,360		$	11,921
Dividend Expense	$	(9,329	)	$	(9,148	)

Payments for order flow represent payments to broker dealer clients, in the normal course of business, for directing their order flow in U.S. equities and, prior to the sale of the retail U.S. options market making business, options to the Company.

Fair value of financial instruments

The Company values its financial instruments using a hierarchy of fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs when measuring fair value.

The fair value hierarchy can be summarized as follows:

• Level 1—Valuations based on quoted prices in active markets for identical assets or liabilities that the Company has the ability to access. Since valuations are based on quoted prices that are readily and regularly available in an active market, valuation of these products does not entail a significant degree of judgment.

• Level 2—Valuations based on quoted prices in markets that are not active or for which all significant inputs are observable, either directly or indirectly.

• Level 3—Valuations based on inputs that are unobservable and significant to the overall fair value measurement.

Changes in fair value are recognized in earnings each period for financial instruments that are carried at fair value. See Footnote 4 “Fair Value” for a description of valuation methodologies applied to the classes of financial instruments at fair value.

Collateralized agreements and financings

Collateralized agreements consist of securities borrowed. Collateralized financings primarily comprise securities loaned and financial instruments sold under agreements to repurchase.

10

KCG HOLDINGS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - CONTINUED

(Unaudited)

• Securities borrowed and securities loaned transactions are recorded at the amount of cash collateral advanced or received. Securities borrowed transactions facilitate the securities settlement process and require the Company to deposit cash or other collateral with the lender. Securities loaned transactions help finance the Company’s securities inventory whereby the Company lends stock to counterparties in exchange for the receipt of cash or other collateral from the borrower. In these transactions, the Company receives or posts cash or other collateral in an amount generally in excess of the market value of the applicable securities borrowed or loaned. The Company monitors the market value of securities borrowed or loaned on a daily basis, and obtains additional collateral or refunds excess collateral as necessary.

• Financial instruments sold under agreements to repurchase and other collateralized financings are used to finance inventories of securities and other financial instruments and are recorded at their contractual amount. The Company has entered into bilateral and tri-party term and overnight repurchase and other collateralized financing agreements which bear interest at negotiated rates. The Company receives cash and makes delivery of financial instruments to a custodian who monitors the market value of these instruments on a daily basis. The market value of the instruments delivered must be equal to or in excess of the principal amount loaned under the repurchase agreements plus the agreed upon margin requirement. The custodian may request additional collateral, if appropriate.

The Company’s securities borrowed, securities loaned, financial instruments sold under agreements to repurchase and other collateralized financings are recorded at amounts that approximate fair value. These items are recorded based upon their contractual terms and are not materially sensitive to shifts in interest rates because they are short-term in nature and are substantially collateralized pursuant to the terms of the underlying agreements. These items would be categorized as Level 2 in the fair value hierarchy if they were required to be recorded at fair value.

Investments

Investments primarily comprise noncontrolling equity ownership interests in trading-related businesses and are held by the Company's non-broker dealer subsidiaries. These investments are accounted for under the equity method, at cost, or at fair value. The equity method of accounting is used when the Company has significant influence over the operating and financial policies of the investee. Investments are held at cost, less impairment if any, when the investment does not have a readily determined fair value, and the Company is not considered to exert significant influence over operating and financial policies of the investee. Investments that are publicly traded and where the Company does not exert significant influence on operating and financial policies are held at fair value and accounted for as available for sale securities and any unrealized gains or losses are recorded net of tax in Other comprehensive income.

Investments accounted for under the equity method or held at cost are reviewed on an ongoing basis to determine whether the carrying values of the investments have been impaired. If the Company determines that an impairment loss on an investment has occurred due to a decline in fair value or other conditions, the investment is written down to its estimated fair value.

Included in the Company's investments are assets supporting a non-qualified deferred compensation plan for certain employees. This plan provides a return to the participants based upon the performance of various investments. In order to hedge its liability under this plan, the Company generally acquires the underlying investments and holds such investments until the deferred compensation liabilities are satisfied. Changes in value of such investments are recorded in Investment income and other, net, with a corresponding charge or credit to Employee compensation and benefits on the Consolidated Statements of Operations. Deferred compensation investments primarily consist of mutual funds, which are accounted for at fair value.

Goodwill and intangible assets

The Company tests goodwill and intangible assets with an indefinite useful life for impairment annually or when an event occurs or circumstances change that signifies that the carrying amounts may not be recoverable. Specific events and changes that could adversely affect the Company’s assessment of its Goodwill, which is all related to its Market Making reporting unit, include the following factors that are significant inputs into its fair value calculations of its reporting units and drive the Company's revenue and expense assumptions:

• the inability to manage trading strategy performance and grow revenues and earnings;

• changes in market structure, legislative, regulatory or financial reporting rules, including the increased focus by Congress, federal and state regulators, the self-regulatory organizations and the media on market structure issues, and in particular, the scrutiny of high frequency trading, alternative trading systems, market fragmentation,

11

KCG HOLDINGS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - CONTINUED

(Unaudited)

colocation, access to market data feeds, and remuneration arrangements such as payment for order flow and exchange fee structures;

• future changes to the Company’s organizational structure and management;

• the Company’s ability to develop competitive new products and services in a timely manner and the acceptance of such products and services by the Company’s customers and potential customers;

• the Company’s ability to keep up with technological changes;

• the Company’s ability to effectively identify and manage market risk, operational and technology risk, cybersecurity risk, legal risk, liquidity risk, reputational risk, counterparty and credit risk, international risk, regulatory risk, and compliance risk;

• the effects of increased competition and the Company’s ability to maintain and expand market share;

• changes in discount and growth rates used by the Company in its fair value models; and

• the Company's ability to manage its costs.

The Company amortizes intangible assets with finite lives on a straight line basis over their estimated useful lives and tests for recoverability whenever events indicate that the carrying amounts may not be recoverable. The Company capitalizes certain costs associated with the acquisition or development of internal-use software and amortizes the software over its estimated useful life of three years, commencing at the time the software is placed in service.

Payable to customers

Payable to customers primarily relate to amounts due on cash and margin transactions. Due to their short-term nature, such amounts approximate fair value.

Repurchases of common stock

The Company may repurchase shares of KCG Class A Common Stock in the open market or through privately negotiated transactions. The Company may structure such repurchases as either a purchase of treasury stock or a retirement of shares. The Company records its purchases of treasury stock, which include shares repurchased in satisfaction of tax withholding obligations upon vesting of restricted awards, at cost as a separate component of stockholders’ equity. The Company may re-issue treasury stock, at average cost, for the acquisition of new businesses and in certain other circumstances. For shares that are retired, the Company records its repurchases at cost, as a reduction in KCG Class A Common Stock for the par value of such retired shares and a reduction in Retained earnings for the balance.

Repurchases of warrants

As discussed in Footnote 15 "Warrants and Stock Repurchases", in connection with the 2013 Mergers, the Company issued Class A, Class B and Class C warrants to acquire shares of KCG Class A Common Stock ("Warrants"). The Company may repurchase Warrants through privately negotiated transactions. The Company records the total cost of its purchases of Warrants as a reduction in Additional paid-in capital.

Repurchases of debt

The Company may repurchase its 6.875% Senior Secured Notes in the open market or through privately negotiated transactions. The Company records its purchases of debt as a reduction in Debt for the par value repurchased as well as a prorated reduction of original issue discount and capitalized issuance costs. Total cost also includes accrued interest on the repurchased debt, which is included in Accrued expenses and other liabilities. The Company will record a gain to the extent that it repurchases debt at a price that is less than par value less the applicable original issue discount and capitalized issuance costs. Such gains are included within Investment income and other, net on the Consolidated Statements of Operations.

Foreign currency translation and foreign currency forward contracts

The Company's foreign subsidiaries generally use the U.S. dollar as their functional currency. The Company also has subsidiaries that utilize a functional currency other than the U.S. dollar, comprising its Indian subsidiary, which utilizes the Indian Rupee and, beginning in the third quarter of 2016, Neonet, which utilizes the Swedish Krona. None of these non-U.S. dollar functional currency subsidiaries are significant to the Company’s Consolidated Financial Statements.

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Assets and liabilities of these non-U.S. dollar functional currency subsidiaries are translated at exchange rates at the end of a period. Revenues and expenses are translated at average exchange rates during the period. Gains and losses resulting from translating foreign currency financial statements into U.S. dollars are included in Accumulated other comprehensive (loss) income on the Consolidated Statements of Financial Condition and Cumulative translation adjustment, net of tax on the Consolidated Statements of Comprehensive Income.

Gains or losses resulting from foreign currency transactions are included in Investment income and other, net on the Company’s Consolidated Statements of Operations. For the three months ended March 31, 2017 and 2016, the Company recorded gains of $0.2 million and $0.4 million, respectively, on foreign currency transactions.

The Company seeks to reduce the impact of fluctuations in foreign exchange rates on its net investment in certain non-U.S. operations through the use of foreign currency forward contracts. For foreign currency forward contracts designated as hedges, the Company assesses its risk management objectives and strategy, including identification of the hedging instrument, the hedged item and the risk exposure and how effectiveness is to be assessed prospectively and retrospectively. The effectiveness of the hedge is assessed based on the overall changes in the fair value of the forward contracts. For qualifying net investment hedges, any gains or losses, to the extent effective, are included in Accumulated other comprehensive (loss) income on the Consolidated Statements of Financial Condition and Cumulative translation adjustment, net of tax, on the Consolidated Statements of Comprehensive Income. The ineffective portion, if any, is recorded in Investment income and other, net on the Consolidated Statements of Operations.

Stock and unit based compensation

Stock and unit based compensation is primarily measured based on the grant date fair value of the awards. These costs are amortized over the requisite service period, if any. Expected forfeitures are considered in determining stock-based employee compensation expense. See Footnote 12 "Stock-Based Compensation" for further discussion.

Soft dollar expense

Under a commission management program, the Company allows institutional clients to allocate a portion of their gross commissions to pay for research and other services provided by third parties. As the Company acts as an agent in these transactions, it records such expenses on a net basis within Commissions and fees on the Consolidated Statements of Operations.

Depreciation, amortization and occupancy

Fixed assets are depreciated on a straight-line basis over their estimated useful lives of three to seven years. Leasehold improvements are being amortized on a straight-line basis, upon occupancy of the location, over the shorter of the term of the related office lease or the expected useful life of the assets. The Company reviews fixed assets and leasehold improvements for impairment, as well as their remaining useful lives whenever events or changes in circumstances indicate that the related carrying amounts may not be recoverable.

The Company recognizes rent expense under operating leases with fixed rent escalations, lease incentives and free rent periods on a straight-line basis over the lease term beginning on the date the Company takes possession of or controls the use of the space, including during free rent periods.

Lease loss accrual

The Company’s policy is to identify excess real estate capacity and where applicable, accrue for related future costs, net of projected sub-lease income upon the date the Company ceases to use the excess real estate. Such accrual is adjusted to the extent the actual terms of sub-leased property differ from the previous assumptions used in the calculation of the accrual.

Income taxes

The Company is a corporation subject to U.S. corporate income tax as well as non-U.S. income taxes in the jurisdictions in which it operates. The Company records deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the financial reporting and tax bases of assets and liabilities and measures them using the enacted tax rates and laws that will be in effect when such differences are expected to reverse. The Company evaluates the recoverability of future tax deductions by assessing the adequacy of future expected taxable income from all sources, including reversal of temporary differences and forecasted operating earnings.

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Variable interest entities

A variable interest entity (“VIE”) is an entity that lacks one or more of the following characteristics (i) the total equity investment at risk is sufficient to enable the entity to finance its activities independently and (ii) the equity holders have the power to direct the activities of the entity that most significantly impact its economic performance, the obligation to absorb the losses of the entity and the right to receive the residual returns of the entity.

The Company will be considered to have a controlling financial interest and will consolidate a VIE if it has both (i) the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE.

Since January 2015, the Company has owned 50% of the voting shares and 50% of the equity of a joint venture (“JV”) which maintains microwave communication networks in the U.S. and Europe, and which is considered to be a VIE. The Company and its JV partner each pay monthly fees for the use of the microwave communication networks in connection with their respective trading activities, and the JV may sell excess bandwidth that is not utilized by the JV members to third parties.

In October 2016, the Company invested in another JV with nine other parties. Each party owns 10% of the voting shares and 10% of the equity of this JV, which is building microwave communication networks in the U.S. and Asia, and which is considered to be a VIE. The Company and all of its JV partners each pay monthly fees for the funding of the construction of the microwave communication networks. When completed, this JV may sell excess bandwidth that is not utilized by its joint venture members to third parties.

In each of the JVs, the Company does not have the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance; therefore it does not have a controlling financial interest in the JVs and does not consolidate the JVs. The Company records its interest in the JVs under the equity method of accounting and records its investment in the JVs within Investments and its amounts payable for communication services provided by the JVs within Accrued expenses and other liabilities on the Consolidated Statements of Financial Condition. The Company records its pro-rata share of the JVs earnings or losses within Investment income and other, net and fees related to the use of communication services provided by the JVs within Communications and data processing on the Consolidated Statements of Operations.

The Company’s exposure to the obligations of these VIEs is generally limited to its interests in each respective JV, which is the carrying value of the equity investment in each JV.

The following table presents the Company’s nonconsolidated VIEs at March 31, 2017 (in thousands):

	Carrying Amount				Maximum Exposure to loss
	Asset		Liability				VIEs' assets
Equity investment	$	15,543	$	314	$	15,543	$	41,569

The following table presents the Company’s nonconsolidated VIE at December 31, 2016 (in thousands):

	Carrying Amount				Maximum Exposure to loss
	Asset		Liability				VIE's assets
Equity investment	$	14,822	$	500	$	14,822	$	36,715

Use of estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results may differ from those estimates.

Recently adopted accounting guidance

In March 2016, the FASB issued an ASU which simplifies several aspects of the accounting for employee share-based payment transactions including the accounting for income taxes, forfeitures and classification on the statement of cash flows. The Company adopted this ASU prospectively as of January 1, 2017. Following the adoption of this ASU:

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• the Company records all excess tax benefits and tax deficiencies as an income tax benefit or expense in the Consolidated Statements of Operations in the period in which they are realized. Previously such excess tax benefits and deficiencies were recorded within Additional paid-in capital on the Consolidated Statements of Financial Condition, although in certain circumstances tax deficiencies could have been recognized as income tax expense.

• excess tax benefits and tax deficiencies are classified in operating activities, specifically within changes in Accrued expenses and other liabilities, in the Consolidated Statements of Cash Flows. Prior to the adoption of this ASU, the Company reported excess tax benefits and tax deficiencies as a financing activity on its Consolidated Statements of Cash Flows.

• the Company no longer includes any assumed proceeds of any windfall tax benefits when applying the treasury stock method for computing diluted EPS. This may result in higher diluted shares outstanding for EPS calculations.

• the Company elected to continue to estimate its forfeiture rate on grant date. Therefore, a cumulative effect adjustment was not necessary upon adoption of this ASU.

Recent accounting guidance to be adopted in future periods

In May 2014, the FASB issued an ASU that updates the principles for recognizing revenue. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In March 2016, the FASB issued an ASU to clarify guidance on principal versus agent evaluation considerations and whether an entity reports revenue on a gross or net basis. These ASUs will be effective for interim and annual reporting periods beginning after December 15, 2017. Early adoption is permitted for reporting periods beginning after December 15, 2016. The Company has not yet determined its transition approach. Because the guidance does not apply to revenue associated with securities trading activities that are accounted for under other GAAP, the Company does not expect the guidance to have a material impact on its Consolidated Statements of Operations most closely associated with financial instruments, including Trading revenues, net, Commissions and fees, and Interest, net. The Company’s implementation efforts include the identification of revenue within the scope of the guidance and the evaluation of certain revenue contracts. The Company’s evaluation of the impact of the new guidance on its Consolidated Financial Statements is ongoing, and it continues to evaluate the timing of recognition for various revenues, including soft dollar related activity, which may be impacted depending on the features of the client arrangements and the presentation of certain contract costs (whether presented gross or offset against revenues).

In January 2016, the FASB issued an ASU that provides entities guidance for the accounting for equity investments, financial liabilities under the fair value option and the presentation and disclosure requirements of financial instruments. The guidance is effective for reporting periods beginning after December 15, 2018 and early adoption is permitted under a modified retrospective approach for certain financial liabilities as specified in this ASU. The Company does not expect the adoption of this ASU to have an impact on its Consolidated Financial Statements.

In February 2016, the FASB issued an ASU which requires lessees to recognize a right-to-use asset and a lease obligation for all leases. Lessees are permitted to make an accounting policy election to not recognize an asset and liability for leases with a term of twelve months or less. Additional qualitative and quantitative disclosures, including significant judgments made by management, will be required. The guidance is effective for reporting periods beginning after December 15, 2018 and early adoption is permitted under a modified retrospective approach. The Company is evaluating the impact of this ASU on its Consolidated Financial Statements.

In August 2016, the FASB issued an ASU which clarifies the presentation and classification of certain cash receipts and cash payments in the statement of cash flows. This ASU is effective for reporting periods beginning after December 15, 2017 and early adoption is permitted. The Company does not expect the adoption of this ASU to have a significant impact on its Consolidated Financial Statements.

In November 2016, the FASB issued an ASU which requires that cash segregated for regulatory and other purposes, generally described as restricted cash or restricted cash equivalents, be included in cash and cash equivalents disclosed in the statements of cash flows. The guidance is effective for all reporting periods beginning after December 15, 2017. Early adoption is permitted and must be applied retrospectively to all periods presented within the statement of cash flows. The Company does not expect the adoption of this ASU to have an impact on its Consolidated Financial Statements.

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In January 2017, the FASB issued an ASU which simplifies the accounting for goodwill impairments. This ASU eliminates the two-step process that required identification of potential impairment and a separate measure of the actual impairment. Goodwill impairment charges, if any, would be determined by reducing the goodwill balance by the difference between the carrying value and the reporting unit’s fair value. The impairment charge would be limited to the carrying value of goodwill. This ASU is effective for annual and interim impairment tests for periods beginning after December 15, 2021. Early adoption is allowed for annual and interim impairment tests occurring after January 1, 2017. The Company does not expect the adoption of this ASU to have a significant impact on its Consolidated Financial Statements.

In January 2017, the FASB issued an ASU to clarify the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The ASU is effective for reporting periods beginning after December 15, 2017. The Company does not expect the adoption of this ASU to have a significant impact on its Consolidated Financial Statements.

3. Assets of Business Held for Sale & Sales of Businesses

In March 2015, the Company sold its spot institutional foreign exchange ECN, KCG Hotspot, to Bats Global Markets, Inc. ("Bats"). As part of the sale, the Company and Bats have agreed to share certain tax benefits, which could result in future payments to the Company of up to approximately $70.0 million in the three-year period following the close, consisting of a $50.0 million payment in 2018 and annual payments of up to $6.6 million per year (the "Annual Payments"), from 2016 up to and including 2018. On March 1, 2017, Bats merged with CBOE Holdings, Inc. (“CBOE”) (the “Bats Merger”). The remaining Annual Payments are contingent on CBOE generating sufficient taxable net income to receive the tax benefits.

The Company has elected the fair value option related to the receivable from Bats and considers the receivable to be a Level 2 asset in the fair value hierarchy as the fair value is derived from observable significant inputs such as contractual cash flows and market discount rates. KCG received the first and second Annual Payments of $6.6 million and $6.5 million in March 2016 and 2017, respectively. The remaining additional potential payments of $56.8 million are recorded at a fair value of $54.1 million in Other assets on the Consolidated Statement of Financial Condition as of March 31, 2017.

In accordance with the Company's strategic review of its businesses and evaluation of their potential value in the marketplace relative to their current and expected returns, KCG determined in 2015 that certain of its businesses including its DMM and retail options market making businesses, were no longer considered core to its strategy.

Assets of businesses held for sale are recorded at the lower of their book value or their estimated fair value and are reported as Assets of business held for sale on the Consolidated Statements of Financial Condition. Included in the $8.2 million of Assets of business held for sale at December 31, 2016 were assets related to a technology platform. At March 31, 2017, the Company determined that this business was no longer held for sale and as a result, reclassified the assets back to intangible assets on the Consolidated Statements of Financial Condition. The Company does not have any businesses that are considered to be held for sale at March 31, 2017. See Footnote 9 "Goodwill and Intangible Assets" for further details.

Assets related to the Company's retail options market making business, which were sold to a third party in March 2016 resulted in a gain of $2.9 million, which is included in Investment income and other, net on the Consolidated Statement of Operations for the three months ended March 31, 2016. The DMM business was sold to Citadel in May 2016. As charges were recorded in the fourth quarter of 2015 to reflect the estimated fair value of this held for sale business, no gain or loss on sale was recorded in 2016.

The assets of businesses held for sale as December 31, 2016 are summarized as follows (in thousands):

	December 31, 2016
Assets:
Intangible assets, net of accumulated amortization	$	8,194
Total assets of businesses held for sale	$	8,194

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4. Fair Value

The Company’s financial instruments recorded at fair value have been categorized based upon a fair value hierarchy in accordance with accounting guidance, as described in Footnote 2 “Significant Accounting Policies.” The following fair value hierarchy table presents information about the Company’s financial assets and liabilities measured at fair value (in thousands):

	Assets and Liabilities Measured at Fair Value on a Recurring Basis
March 31, 2017	Level 1		Level 2		Level 3		Total
Assets
Financial instruments owned, at fair value:
Equities	$	2,179,211	$	—	$	—	$	2,179,211
Corporate debt	91,314		—		—		91,314
U.S. government and Non-U.S. government obligations	37,618		—		—		37,618
Listed options	12,299		—		—		12,299
Total Financial instruments owned, at fair value	2,320,442		—		—		2,320,442
Investments(1)	2,379		2,234		—		4,613
Other (2)	—		54,142		2,838		56,980
Total assets held at fair value	$	2,322,821	$	56,376	$	2,838	$	2,382,035
Liabilities
Financial instruments sold, not yet purchased, at fair value:
Equities	$	1,694,374	$	—	$	—	$	1,694,374
Corporate debt	85,926		—		—		85,926
U.S. government and Non-U.S. government obligations	91,242		—		—		91,242
Listed options	35,835		—		—		35,835
Foreign currency forward contracts	—		598		—		598
Total liabilities held at fair value	$	1,907,377	$	598	$	—	$	1,907,975

⁽¹⁾  Investments comprise $2.4 million of Level 1 investments in CME Group and $2.2 million of Level 2 investments primarily related to deferred compensation investments, all of which are included within Investments on the Consolidated Statements of Financial Condition. See Footnote 8 "Investments" for additional information.

⁽²⁾  Other primarily consists of a $54.1 million receivable from Bats related to the sale of KCG Hotspot and a $2.8 million receivable from the sale of an investment, both of which are included within Other Assets on the Consolidated Statements of Financial Condition.

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	Assets and Liabilities Measured at Fair Value on a Recurring Basis
December 31, 2016	Level 1		Level 2		Level 3		Total
Assets
Financial instruments owned, at fair value:
Equities	$	2,343,033	$	—	$	—	$	2,343,033
Corporate debt	127,237		—		—		127,237
U.S. government and Non-U.S. government obligations	50,461		—		—		50,461
Listed options	19,100		—		—		19,100
Foreign currency forward contracts	—		30		—		30
Total Financial instruments owned, at fair value	2,539,831		30		—		2,539,861
Investments (1)	9,198		2,286		—		11,484
Other (2)	—		60,538		2,846		63,384
Total assets held at fair value	$	2,549,029	$	62,854	$	2,846	$	2,614,729
Liabilities
Financial instruments sold, not yet purchased, at fair value:
Equities	$	1,821,957	$	—	$	—	$	1,821,957
Listed options	12,961		—		—		12,961
U.S. government obligations	87,661		—		—		87,661
Corporate debt	123,561		—		—		123,561
Total liabilities held at fair value	$	2,046,140	$	—	$	—	$	2,046,140

⁽¹⁾  Investments comprise $9.2 million of Level 1 investments in CME Group and Bats and also includes $2.3 million of Level 2 investments primarily related to deferred compensation investments, all of which are included within Investments on the Consolidated Statements of Financial Condition. See Footnote 8 "Investments" for additional information.

⁽²⁾  Other primarily consists of a $60.5 million receivable from Bats related to the sale of KCG Hotspot and a $2.8 million receivable from the sale of an investment, both of which are included in Other assets on the Consolidated Statements of Financial Condition.

The Company's derivative financial instruments are also held at fair value. See Footnote 5 "Derivative Financial Instruments" for further information.

The Company’s equities, listed options, U.S. government and non-U.S. government obligations, corporate debt and strategic investments that are publicly traded and for which the Company does not exert significant influence on operating and financial policies are generally classified within Level 1 of the fair value hierarchy because they are valued using quoted market prices or broker or dealer quotations with reasonable levels of price transparency.

The types of instruments that trade in markets that are not considered to be active, but are valued based on observable inputs such as quoted market prices or alternative pricing sources with reasonable levels of price transparency are generally classified within Level 2 of the fair value hierarchy.

As of March 31, 2017 and December 31, 2016, a receivable related to the sale of an investment was classified within Level 3 of the fair value hierarchy.

There were no transfers of assets or liabilities held at fair value between levels of the fair value hierarchy for any periods presented.

The following is a summary of changes in fair value of the Company's financial assets that have been categorized within Level 3 of the fair value hierarchy at March 31, 2017 and December 31, 2016 (in thousands):

	Level 3 Financial Assets as of March 31, 2017
	Balance at January 1, 2017		Realized gains(losses) during period		Unrealized gains (losses) during the period			Purchases		Sales		Settlements		Issuances		Transfers in or (out) of Level 3		Balance at March 31, 2017
Receivable from sold investment	$	2,846	$	—	$	(8	)	$	—	$	—	$	—	$	—	$	—	$	2,838

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	Level 3 Financial Assets as of December 31, 2016
	Balance at January 1, 2016		Realized gains(losses) during period		Unrealized gains (losses) during the period		Purchases		Sales		Settlements			Issuances		Transfers in or (out) of Level 3		Balance at December 31, 2016
Receivable from sold investment	$	5,789	$	—	$	980	$	—	$	—	$	(3,923	)	$	—	$	—	$	2,846

Unrealized gains or losses are included within Investment income and other, net on the Consolidated Statements of Operations.

The following is a description of the valuation basis, techniques and significant inputs used by the Company in valuing its Level 2 and Level 3 assets and liabilities.

Foreign currency forward contracts

At March 31, 2017 and December 31, 2016, the Company had a foreign currency forward contract with a notional value of 735.0 million Indian Rupees ($11.3 million). This forward contract is used to hedge the Company’s investment in its Indian subsidiary.

The fair value of these forward contracts were determined based upon spot foreign exchange rates and dealer quotations.

Investments

Investments primarily include deferred compensation investments which comprise investments in liquid mutual funds that the Company acquires to hedge its obligations to employees under certain non-qualified deferred compensation arrangements. These mutual fund investments can generally be redeemed at any time and are valued based upon quoted market prices.

Other

Other primarily consists of the fair value of the Company's receivable from Bats/CBOE from the sale of KCG Hotspot as more fully described in Footnote 3 "Assets of Business Held for Sale & Sales of Businesses".

The Company has elected the fair value option related to its receivable from Bats/CBOE. It considers the receivable to be a Level 2 asset in the fair value hierarchy as the fair value is derived from observable significant inputs such as contractual cash flows and market discount rates.

The Company has elected the fair value option related to a receivable originating from the sale of an investment which is classified within Level 3 of the fair value hierarchy. As of March 31, 2017, the range of undiscounted amounts the Company may receive for this receivable is between $0 and $4.6 million. The valuation of this financial instrument was based upon the use of a model developed by Company management. Inputs into this model were based upon risk profiles of similar financial instruments in the market and reflects management’s judgment relating to the appropriate discount on the receivable as well as a financial assessment of the debtor. To the extent that valuations based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. Movements in these unobservable inputs would not materially impact the Company's results of operations.

5. Derivative Financial Instruments

The Company enters into derivative transactions as part of its trading activities and to manage foreign currency exposure. Cash flows associated with such derivative activities are included in cash flows from operating activities on the Consolidated Statements of Cash Flows.

During the normal course of business, the Company enters into futures contracts. These financial instruments are subject to varying degrees of risks whereby the fair value of the securities underlying the financial instruments may be in excess of, or less than, the contract amount. The Company is obligated to post collateral against certain futures contracts.

The Company has entered into and may continue to enter into International Swaps and Derivative Association, Inc. (“ISDA”) master netting agreements with counterparties. Master agreements provide protection in bankruptcy in certain circumstances and, where legally enforceable, enable receivables and payables with the same counterparty to be settled or otherwise eliminated by applying amounts due against all or a portion of an amount due from the

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counterparty or a third party. The Company may also enter into bilateral trading agreements and other customer agreements that provide for the netting of receivables and payables with a given counterparty as a single net obligation.

Under the ISDA master netting agreements, the Company typically also executes credit support annexes, which provide for collateral, either in the form of cash or securities, to be posted or paid by a counterparty based on the fair value of the derivative receivable or payable based on the rates and parameters established in the credit support annex. In the event of counterparty’s default, provisions of the ISDA master agreement permit acceleration and termination of all outstanding transactions covered by the agreement such that a single amount is owed by, or to, the non-defaulting party. Any collateral posted can be applied to the net obligations, with any excess returned and the collateralized party has a right to liquidate the collateral. Any residual claim after netting is treated along with other unsecured claims in bankruptcy court.

The Company is also a party to clearing agreements with various central clearing parties. Under these arrangements, the central clearing counterparty facilitates settlement between counterparties based on the net payable owed or receivable due and, with respect to daily settlement, cash is generally only required to be deposited to the extent of the net amount. In the event of default, a net termination amount is determined based on the market values of all outstanding positions and the clearing organization or clearing member provides for the liquidation and settlement of the net termination amount among all counterparties to the open derivative contracts.

The following tables summarize the fair value and number of derivative instruments held at March 31, 2017 and December 31, 2016. These instruments include those classified as Financial instruments owned, at fair value, Financial instruments sold, not yet purchased, at fair value, as well as futures contracts and bi-lateral over the counter swaps which are reported within Receivable from brokers, dealers and clearing organizations on the Consolidated Statements of Financial Condition. The fair value of assets/liabilities are shown gross of counterparty netting and cash collateral received and pledged. The following tables also provide information regarding 1) the extent to which, under enforceable master netting agreements, such balances are presented net on the Consolidated Statements of Financial Condition as appropriate under GAAP, and 2) the extent to which other rights of setoff associated with these agreements exist and could have an effect on the Company's financial position (in thousands, except contract amounts):

		March 31, 2017
	Financial Statements	Assets				Liabilities
	Location	Fair Value			Contracts	Fair Value			Contracts
Foreign currency
Futures contracts	Receivable from brokers, dealers and clearing organizations	$	163		364	$	240		438
Forward contracts (1)	Financial instruments owned, at fair value	—			—	598			1
Equity
Futures contracts	Receivable from brokers, dealers and clearing organizations	1,594			7,047	2,978			7,326
Swap contracts	Receivable from brokers, dealers and clearing organizations	—			—	195			2
Listed options	Financial instruments owned/sold, not yet purchased, at fair value	12,299			75,294	35,835			76,347
Fixed income
Futures contracts	Receivable from brokers, dealers and clearing organizations	2,545			4,234	5,678			4,038
Commodity
Futures contracts	Receivable from brokers, dealers and clearing organizations	45,889			23,531	45,697			25,762
Gross derivative assets/liabilities, before netting		$	62,490			$	91,221
Less: Legally enforceable master netting agreements
Exchange traded (3)		(49,841		)		(54,593		)
Bi-lateral over-the-counter (4)		—				(195		)
Net amounts per Consolidated Statement of Financial Condition (5)		$	12,649			$	36,433

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(Unaudited)

		December 31, 2016
	Financial Statements	Assets				Liabilities
	Location	Fair Value			Contracts	Fair Value			Contracts
Foreign currency
Futures contracts	Receivable from brokers, dealers and clearing organizations	$	360		1,285	$	1,663		6,495
Forward contracts (1)	Financial instruments owned, at fair value	30			1	—			—
Equity
Futures contracts	Receivable from brokers, dealers and clearing organizations	1,451			2,056	1,644			2,944
Swap contracts	Receivable from brokers, dealers and clearing organizations	16			1	154			1
Listed options	Financial instruments owned/sold, not yet purchased, at fair value	19,100			85,797	12,961			90,063
Forward contracts(2)	Accrued expenses and other liabilities	—			—	1,599			1
Fixed income
Futures contracts	Receivable from brokers, dealers and clearing organizations	4,627			8,590	5,541			5,165
Commodity
Futures contracts	Receivable from brokers, dealers and clearing organizations	86,393			31,800	86,100			31,906
Gross derivative assets/liabilities, before netting		$	111,977			$	109,662
Less: Legally enforceable master netting agreements
Exchange traded (3)		(92,572		)		(94,948		)
Bi-lateral over-the-counter (4)		—				(154		)
Net amounts per Consolidated Statement of Financial Condition (5)		$	19,405			$	14,560

⁽¹⁾  The foreign currency forward contract represents a net investment hedge and is designated as a hedging instrument.

⁽²⁾  The equity forward contract represents a liability to deliver shares of Bats common stock to General Atlantic as described in Footnote 8 "Investments".

⁽³⁾  Exchange traded instruments comprise futures contracts.

⁽⁴⁾  Bi-lateral over-the-counter instruments comprise swaps and forward contracts.

⁽⁵⁾  The Company has not received or pledged additional collateral under master netting agreements and or other credit support agreements that is eligible to be offset beyond what is offset in the Consolidated Statements of Financial Condition.

The fair value of listed options and forward contracts in the tables above are classified as Level 1 and Level 2 in the fair value hierarchy, respectively. The fair value of futures contracts and swaps in the tables above are classified as Level 1 and Level 2 in the fair value hierarchy, respectively.

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The following table summarizes the gains and losses included in the Consolidated Statements of Operations for the three months ended March 31, 2017 and 2016.

		Gain (Loss) Recognized
	Financial Statements	For the three months ended March 31,
	Location	2017			2016
Derivative instruments not designated as hedging instruments:
Foreign currency
Futures contracts	Trading revenues, net	$	2,712		$	312
Equity
Futures contracts	Trading revenues, net	(7,998		)	8,922
Swap contracts	Trading revenues, net	(795		)	1,886
Listed options	Trading revenues, net	(24		)	3,871
Fixed income
Futures contracts	Trading revenues, net	(118		)	6,833
Commodity
Futures contracts	Trading revenues, net	3,750			6,966
		$	(2,473	)	$	28,790
Derivative instruments designated as hedging instruments:
Foreign exchange - forward contract	Accumulated other comprehensive (loss) income	$	(389	)	$	(149	)

6. Collateralized Transactions

The Company receives financial instruments as collateral in connection with securities borrowed and financial instruments purchased under agreements to resell. Such financial instruments generally consist of equities, corporate obligations and obligations of the U.S. government, but may also include obligations of federal agencies, foreign governments and convertible securities. In most cases the Company is permitted to deliver or repledge these financial instruments in connection with securities lending, other secured financings or for meeting settlement obligations.

The table below presents financial instruments at fair value received as collateral related to Securities borrowed or Receivable from brokers, dealers and clearing organizations on the Consolidated Statements of Financial Condition that were permitted to be delivered or repledged and that were delivered or repledged by the Company as well as the fair value of financial instruments which could be further repledged by the receiving party (in thousands):

	March 31, 2017		December 31, 2016
Collateral permitted to be delivered or repledged	$	1,623,886	$	1,634,979
Collateral that was delivered or repledged	1,577,554		1,550,755
Collateral permitted to be further repledged by the receiving counterparty	151,534		41,730

In order to finance securities positions, the Company also pledges financial instruments that it owns to counterparties who, in turn, are permitted to deliver or repledge them. Under these transactions, the Company pledges certain financial instruments owned to collateralize repurchase agreements and other secured financings. Repurchase agreements and other secured financings are short-term and mature within one year. Financial instruments owned and pledged to counterparties that have the right to sell or repledge such financial instruments primarily consist of equities. Financial instruments owned and pledged to counterparties that do not have the right to sell or repledge such financial instruments consist of equities, corporate obligations and obligations of the U.S. government, but may also include obligations of federal agencies, foreign governments and convertible securities.

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The table below presents information about assets pledged by the Company (in thousands):

	March 31, 2017		December 31, 2016
Financial instruments owned, at fair value, pledged to counterparties that have the right to deliver or repledge	$	368,736	$	314,720
Financial instruments owned, at fair value, pledged to counterparties that do not have the right to deliver or repledge	1,204,165		1,291,979

The table below presents the gross carrying value of Securities loaned, Financial instruments sold under agreements to repurchase and other collateralized financings by class of collateral pledged (in thousands):

March 31, 2017			Financial instruments sold under agreements to repurchase		Other collateralized financings
Asset Class	Securities Loaned
Equities	$	459,533	$	940,000	$	50,000
U.S. government obligations	—		12,584		—
Total	$	459,533	$	952,584	$	50,000

December 31, 2016			Financial instruments sold under agreements to repurchase		Other collateralized financings
Asset Class	Securities Loaned
Equities	$	369,168	$	989,812	$	76,176
U.S. government obligations	—		12,775		—
Corporate debt	3,463		25,188		23,824
Total	$	372,631	$	1,027,775	$	100,000

The Company may enter into master netting agreements and collateral arrangements with counterparties in order to manage its exposure to credit risk associated with securities financing transactions. Such transactions are generally executed under standard industry agreements, including, but not limited to, master securities lending agreements (securities lending transactions) and master repurchase agreements (repurchase transactions). Master agreements provide protection in bankruptcy in certain circumstances and, where legally enforceable, enable receivables and payables with the same counterparty to be settled or otherwise eliminated by applying amounts due against all or a portion of an amount due from the counterparty or a third party. The Company may also enter into bilateral trading agreements and other customer agreements that provide for the netting of receivables and payables with a given counterparty as a single net obligation.

In the event of a counterparty’s default, provisions of the master agreement permit acceleration and termination of all outstanding transactions covered by the agreement such that a single amount is owed by, or to, the non-defaulting party. Any collateral posted can be applied to the net obligations, with any excess returned and the collateralized party has a right to liquidate the collateral. Any residual claim after netting is treated as an unsecured claim in bankruptcy court.

The Company is also a party to clearing agreements with various central clearing parties. Under these arrangements, the central clearing counterparty facilitates settlement between counterparties based on the net payable owed or receivable due and, with respect to daily settlement, cash is generally only required to be deposited to the extent of the net amount. In the event of default, a net termination amount is determined based on the market values of all outstanding positions and the clearing organization or clearing member provides for the liquidation and settlement of the net termination amount among all counterparties to the open repurchase and/or securities lending transactions.

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(Unaudited)

The gross amounts of assets and liabilities subject to netting and gross amounts offset in the Consolidated Statements of Financial Condition were as follows (in thousands):

March 31, 2017	Gross Amounts Recognized		Gross Amounts Offset in the Statements of Financial Condition		Net Amounts Presented in the Statements of Financial Condition		Gross Amounts Not Offset in the Statement of Financial Condition				Net Amount
							Available Collateral(1)		Counterparty Netting(2)
Assets
Securities borrowed	$	1,594,442	$	—	$	1,594,442	$	1,537,957	$	6,225	$	50,260
Receivable from brokers, dealers and clearing organizations (3)	13,735		—		13,735		13,717		2		16
Total assets	$	1,608,177	$	—	$	1,608,177	$	1,551,674	$	6,227	$	50,276
Liabilities
Securities loaned	$	459,533	$	—	$	459,533	$	446,050	$	6,225	$	7,258
Financial instruments sold under agreements to repurchase	952,584		—		952,584		952,582		2		—
Other collateralized financings	50,000		—		50,000		50,000		—		—
Total liabilities	$	1,462,117	$	—	$	1,462,117	$	1,448,632	$	6,227	$	7,258

⁽¹⁾  Includes securities received or delivered under collateral arrangements with counterparties that could be liquidated in the event of a counterparty default and thus offset against a counterparty's rights and obligations under the respective repurchase agreements or securities borrowing or lending arrangements.

⁽²⁾  Under master netting agreements with its counterparties, the Company has the legal right of offset with a counterparty, which incorporates all of the counterparty's outstanding rights and obligations under the arrangement. These balances reflect additional credit risk mitigation that is available by counterparty in the event of a counterparty's default, but which are not netted in the Consolidated Statement of Financial Condition because other netting provisions under U.S. GAAP are not met.

⁽³⁾  Represents financial instruments purchased under agreement to resell.

December 31, 2016	Gross Amounts Recognized		Gross Amounts Offset in the Statements of Financial Condition		Net Amounts Presented in the Statements of Financial Condition		Gross Amounts Not Offset in the Statement of Financial Condition				Net Amount
							Available Collateral(1)		Counterparty Netting(2)
Assets
Securities borrowed	$	1,688,222	$	—	$	1,688,222	$	1,623,281	$	4,581	$	60,360
Receivable from brokers, dealers and clearing organizations (3)	21,832		—		21,832		21,797		—		35
Total assets	$	1,710,054	$	—	$	1,710,054	$	1,645,078	$	4,581	$	60,395
Liabilities
Securities loaned	$	372,631	$	—	$	372,631	$	358,023	$	4,581	$	10,027
Financial instruments sold under agreements to repurchase	1,027,775		—		1,027,775		1,027,775		—		—
Other collateralized financings	100,000		—		100,000		100,000		—		—
Total liabilities	$	1,500,406	$	—	$	1,500,406	$	1,485,798	$	4,581	$	10,027

⁽¹⁾  Includes securities received or delivered under collateral arrangements with counterparties that could be liquidated in the event of a counterparty default and thus offset against a counterparty's rights and obligations under the respective repurchase agreements or securities borrowing or lending arrangements.

⁽²⁾  Under master netting agreements with its counterparties, the Company has the legal right of offset with a counterparty, which incorporates all of the counterparty's outstanding rights and obligations under the arrangement. These balances reflect additional credit risk mitigation that is available by a counterparty in the event of a counterparty's default, but which are not netted in the Consolidated Statement of Financial Condition because other netting provisions under U.S. GAAP are not met.

⁽³⁾  Represents financial instruments purchased under agreement to resell.

See Footnote 5 "Derivative Financial Instruments" for information related to the offsetting of derivatives in the Company's Consolidated Financial Statements.

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(Unaudited)

Maturities of Securities loaned, Financial instruments sold under agreements to repurchase and other collateralized financings are provided in the table below (in thousands):

As of March 31, 2017	Overnight		0 - 30 days		31 - 60 days		61 - 90 days		Total
Securities loaned	$	459,533	$	—	$	—	$	—	$	459,533
Financial instruments sold under agreements to repurchase	12,584		335,000		365,000		240,000		952,584
Other collateralized financings	—		50,000		—		—		50,000
Total	$	472,117	$	385,000	$	365,000	$	240,000	$	1,462,117

As of December 31, 2016	Overnight		0 - 30 days		31 - 60 days		61 - 90 days		Total
Securities loaned	$	372,631	$	—	$	—	$	—	$	372,631
Other	—		100,000		—		—		100,000
Financial instruments sold under agreements to repurchase	12,775		410,000		465,000		140,000		1,027,775
Total	$	385,406	$	510,000	$	465,000	$	140,000	$	1,500,406

7. Receivable from and Payable to Brokers, Dealers and Clearing Organizations

Amounts receivable from and payable to brokers, dealers and clearing organizations consist of the following (in thousands):

	March 31, 2017		December 31, 2016
Receivable:
Clearing organizations and other	$	575,544	$	619,425
Financial instruments purchased under agreement to resell	13,735		21,832
Securities failed to deliver	212,399		191,528
Total receivable	$	801,678	$	832,785
Payable:
Clearing organizations and other	$	433,164	$	458,341
Securities failed to receive	62,089		60,559
Total payable	$	495,253	$	518,900

Management believes that the carrying value of amounts receivable from and payable to brokers, dealers and clearing organizations approximates fair value since they are short term in nature.

8. Investments

Investments primarily comprise strategic investments and deferred compensation investments. Investments consist of the following (in thousands):

	March 31, 2017		December 31, 2016
Strategic investments:
Investments accounted for under the equity method	$	17,313	$	16,707
Investments held at fair value	2,379		9,198
Investments held at cost, less impairment	2,790		2,789
Total strategic investments	22,482		28,694
Other investments	2,234		2,285
Total investments	$	24,716	$	30,979

For the three months ended March 31, 2017 and 2016, the Company recorded income of approximately $48 thousand and $4.8 million, respectively, related to Investments accounted for under the equity method of accounting, which is recorded within Investment income and other, net in the Consolidated Statements of Operations. The Company's investments accounted for under the equity method are considered to be related parties. See Footnote 11 "Related Parties".

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(Unaudited)

In the first quarter of 2016, one of the Company's investments held at adjusted cost, less impairment made a distribution to its owners, including the Company. As a result of this distribution, the Company adjusted the investment's carrying value and recognized a pre-tax gain of $2.3 million, which is included in Investment income and other, net on the Consolidated Statements of Operations for the three months ended March 31, 2016.

Investments held at fair value are accounted for as available for sale securities and any unrealized gains or losses are recorded net of tax in Other comprehensive (loss) income.

Bats/General Atlantic Transactions

In the fourth quarter 2016, the Company sold approximately 2.0 million shares of common stock of Bats in the open market (“open market transactions”) and sold an additional 2.2 million shares of common stock of Bats in a block sale ("block sale").

In November 2016 KCG entered into a purchase agreement with GA-GTCO Interholdco, LLC (“General Atlantic” or “GA”) to exchange approximately 8.9 million shares of its Bats common stock for i) GA’s 18.7 million shares of KCG Class A Common Stock and, ii) 8.1 million Warrants (the “Swap Transaction”).

The Company’s 6.875% Indenture (as defined below) contains covenants that limit the Company’s ability to repurchase shares of KCG Class A Common Stock and Warrants.

Substantially all of the exchange was completed in November 2016, however as a result of these limitations, and as contemplated in the agreement with GA, the Company could not finalize the repurchase of approximately 1.1 million Warrants, and therefore retained approximately 94,000 common shares of Bats at December 31, 2016. The $2.9 million value of these remaining Bats shares was recorded as a receivable from GA within Other assets and a related $2.9 million liability to GA was recorded within Accrued expenses and other liabilities on the Company’s December 31, 2016 Consolidated Statement of Financial Condition. The exchange was completed in January 2017.

Pursuant to the terms of the Swap Transaction, the Company paid transaction fees of $2.9 million to Jefferies LLC, comprising half due from the Company and the other half on behalf of GA. The settlement of the portion paid by the Company on behalf of GA was completed by KCG retaining Bats common stock with a fair value of $1.4 million at the time of the Swap Transaction, or approximately 46,000 shares of the aforementioned 94,000 shares of Bats shares owed to GA. The remaining 48,000 shares owed to GA were considered to be a derivative for financial reporting purposes as of December 31, 2016. See Footnote 5 "Derivative Financial Instruments".

As a result of the open market transactions, block sale and Swap Transaction, the Company sold approximately 13.0 million shares of Bats, and the Company’s total holdings were reduced to approximately 206,000 shares or less than 0.5% of total shares of Bats common stock outstanding. The Company believes that it no longer has significant influence over Bats, and as a result, in November 2016, the Company ceased to account for its remaining interest in Bats under the equity method.

The approximately 206,000 shares of Bats remaining as an investment had a fair value of $6.9 million at December 31, 2016 and were classified as available-for-sale securities (“AFS”), which was recorded within Investments on the Company’s Consolidated Statements of Financial Condition as of December 31, 2016.

In the first quarter of 2017, the Company sold its remaining shares of Bats and recorded a pre-tax gain of $4.8 million which is included in Investment income and other, net on the Consolidated Statements of Operations for the three months ended March 31, 2017. As of March 31, 2017, the Company does not own any shares of Bats.

9. Goodwill and Intangible Assets

Goodwill and intangible assets with indefinite lives are assessed for impairment annually or when events indicate that the amounts may be impaired. The Company assesses goodwill for impairment at the reporting unit level. The Company’s reporting units are the components of its business segments for which discrete financial information is available and is regularly reviewed by the Company’s management. As part of the assessment for impairment, the Company considers the cash flows of the respective reporting unit and assesses the fair value of the respective reporting unit as well as the overall market value of the Company compared to its net book value. The assessment of fair value of the reporting units is principally performed using a discounted cash flow methodology with a risk-adjusted weighted average cost of equity which the Company believes to be the most reliable indicator of the fair values of its respective reporting units. The Company also assesses the fair value of each reporting unit based upon its estimated market value and assesses the Company’s overall market value based upon the market price of KCG Class A Common Stock.

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(Unaudited)

Intangible assets are assessed for recoverability when events or changes in circumstances indicate that the carrying amount of the asset or asset group may not be recoverable. The Company assesses intangible assets for impairment at the “asset group” level which is the lowest level for which identifiable cash flows are largely independent of the cash flows of other groups of assets and liabilities. As part of the assessment for impairment, the Company considers the cash flows of the respective asset group and assesses the fair value of the respective asset group. Step one of the impairment assessment for intangibles is performed using undiscounted cash flow models, which indicates whether the future cash flows of the asset group are sufficient to recover the book value of such asset group. When an asset is not considered to be recoverable, step two of the impairment assessment is performed using a discounted cash flow methodology with a risk-adjusted weighted average cost of equity to determine the fair value of the intangible asset group. In cases where amortizable intangible assets and goodwill are assessed for impairment at the same time, the amortizable intangibles are assessed for impairment prior to goodwill being assessed.

No events occurred in the three months ended March 31, 2017 or 2016 that would indicate that the carrying amounts of the Company’s goodwill or intangible assets may not be recoverable.

As detailed in Footnote 3 “Assets of Business Held for Sale & Sales of Businesses”, in late 2015, the Company conducted a strategic review of its businesses and determined that one of its businesses was no longer considered core to its strategy and the Company sought the opportunity to exit or divest this business. The estimated fair value of intangibles related to a business held for sale of $8.2 million as of December 31, 2016 was reported within Assets of business held for sale on the Consolidated Statements of Financial Condition. These intangibles, which comprise a technology platform, have been reclassified to Intangible Assets as of March 31, 2017 as it has been determined that such assets of the business will not be sold.

As of both March 31, 2017 and December 31, 2016, $16.4 million of goodwill was recorded within the Market Making segment.

Intangible assets with definite useful lives are amortized over their remaining estimated useful lives, the majority of which have been determined to range from one to six years. The weighted average remaining life of the Company’s intangible assets with definite useful lives at both March 31, 2017 and December 31, 2016 was approximately two years.

The following tables summarize the Company’s Intangible assets, net of accumulated amortization by segment and type (in thousands):

	March 31, 2017		December 31, 2016
Market Making
Technology	$	38,759	$	39,536
Trading rights	7,028		7,027
Total	45,787		46,563
Global Execution Services
Technology	20,033		20,694
Customer relationships	7,583		7,944
Trade names	625		650
Total	28,241		29,288
Corporate and Other
Technology (1)	16,418		8,084
Total	$	90,446	$	83,935

⁽¹⁾  Excluded from the December 31, 2016 balance is $8.2 million of intangibles related to a business which met the requirements to be considered held for sale. As noted above and in Footnote 3 "Assets of Business Held for Sale & Sales of Businesses", such amounts were included in Assets of business held for sale at December 31, 2016, however, such intangibles were no longer considered to be held for sale at March 31, 2017 and are therefore included above at March 31, 2017.

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(Unaudited)

		March 31, 2017			December 31, 2016
Technology (1)	Gross carrying amount	$	183,567		$	157,188
	Accumulated amortization	(108,347		)	(88,874		)
	Net carrying amount	75,220			68,314
Trading rights (2)	Gross carrying amount	7,509			7,509
	Accumulated amortization	(491		)	(482		)
	Net carrying amount	7,018			7,027
Customer relationships (3)	Gross carrying amount	13,000			13,000
	Accumulated amortization	(5,417		)	(5,056		)
	Net carrying amount	7,583			7,944
Trade names (4)	Gross carrying amount	1,000			1,000
	Accumulated amortization	(375		)	(350		)
	Net carrying amount	625			650
Total	Gross carrying amount	205,076			178,697
	Accumulated amortization	(114,630		)	(94,762		)
	Net carrying amount	$	90,446		$	83,935

⁽¹⁾  The weighted average remaining life for technology, including capitalized internal use software, was approximately two years as of both March 31, 2017 and December 31, 2016. Excluded from the December 31, 2016 balance is $8.2 million of technology assets related to Assets of businesses held for sale. As noted above and in Footnote 3 "Assets of Business Held for Sale & Sales of Businesses", these assets are included in Assets of businesses held for sale at December 31, 2016.

⁽²⁾  Trading rights provide the Company with the rights to trade on certain exchanges. The weighted average remaining life of trading rights with definite useful lives was approximately 3 and 4 years as of March 31, 2017 and December 31, 2016, respectively. As of March 31, 2017 and December 31, 2016, $6.9 million of trading rights had indefinite useful lives.

⁽³⁾  Customer relationships relate to KCG BondPoint. The weighted average remaining life was approximately 5 and 6 years as of March 31, 2017 and December 31, 2016, respectively. Lives may be reduced depending upon actual retention rates.

⁽⁴⁾  Trade names relate to KCG BondPoint. The weighted average remaining life was approximately 6 and 7 years as of March 31, 2017 and December 31, 2016, respectively.

The following table summarizes the Company’s amortization expense relating to Intangible assets (in thousands):

	For the three months ended March 31,
	2017		2016
Amortization expense	$	10,109	$	7,559

As of March 31, 2017, the following table summarizes the Company’s estimated amortization expense for future periods (in thousands):

	Amortization     expense
For the nine months ended December 31, 2017	$	33,654
For the year ended December 31, 2018	32,749
For the year ended December 31, 2019	12,708
For the year ended December 31, 2020	2,009
For the year ended December 31, 2021	1,544

10. Debt

6.875% Senior Secured Notes

The carrying value and fair value of the Company's debt is as follows (in thousands):

	March 31, 2017					December 31, 2016
	Carrying Amount			Fair Value		Carrying Amount			Fair Value
6.875% Senior Secured Notes, $465.0 million par	$	462,141		$	480,113	$	461,899		$	466,628
Debt issuance costs	(6,958		)	—		(7,546		)	—
Total	$	455,183		$	480,113	$	454,353		$	466,628

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(Unaudited)

The fair value of the Company's 6.875% Senior Secured Notes is based upon the value of such debt in the secondary market.

The Company's 6.875% Senior Secured Notes would be categorized as Level 2 in the fair value hierarchy if they were required to be recorded at fair value.

On March 10, 2015, the Company entered into a purchase agreement with Jefferies LLC, as initial purchaser (the “Initial Purchaser”), pursuant to which the Company agreed to sell, and the Initial Purchaser agreed to purchase, $500.0 million aggregate principal amount of 6.875% Senior Secured Notes (the “6.875% Senior Secured Notes”), pursuant to an indenture dated March 13, 2015 (the “6.875% Indenture”), in a private offering exempt from registration under the Securities Act of 1933, as amended (the "Securities Act"). The 6.875% Senior Secured Notes were resold by the Initial Purchaser to qualified institutional buyers in reliance on Rule 144A and Regulation S under the Securities Act.

The 6.875% Senior Secured Notes mature on March 15, 2020 and bear interest at a rate of 6.875% per year, payable on March 15 and September 15 of each year, beginning on September 15, 2015. The 6.875% Senior Secured Notes were issued at 98.962% with net proceeds (before fees and expenses) of $494.8 million and a yield to maturity of 7.083%.

On March 13, 2015, KCG and certain subsidiary guarantors (the "6.875% Guarantors") under the 6.875% Indenture, fully and unconditionally guaranteed on a joint and several basis the 6.875% Senior Secured Notes. The 6.875% Senior Secured Notes and the obligations under the 6.875% Indenture are currently secured by pledges of all of the equity interests in each of KCG’s and the 6.875% Guarantors’ existing and future domestic subsidiaries (but limited to 66% of the voting equity interests of controlled foreign company subsidiaries and excluding equity interests in regulated subsidiaries to the extent that such pledge would have a material adverse regulatory effect or is not permitted by applicable law) and security interests in substantially all other tangible and intangible assets of KCG and the 6.875% Guarantors, in each case subject to customary exclusions; provided, however, that if in the future KCG or any of the 6.875% Guarantors enter into certain first lien obligations (as described in the 6.875% Indenture) the collateral agent is authorized by the holders of the 6.875% Senior Secured Notes to enter into an Intercreditor Agreement pursuant to which the lien securing the 6.875% Senior Secured Notes would be contractually subordinated to the lien securing such first lien obligations, to the extent of the value of the collateral securing such obligations. The 6.875% Senior Secured Notes are effectively subordinated to any existing and future indebtedness that is secured by assets that do not constitute collateral under the 6.875% Senior Secured Notes to the extent of the value of such assets. All of the 6.875% Guarantors are wholly-owned subsidiaries of KCG.

On or after March 15, 2017, KCG may redeem all or a part of the 6.875% Senior Secured Notes upon not less than 30 nor more than 60 days’ notice, at the redemption prices (expressed as percentages of principal amount) set forth below plus accrued and unpaid interest on the 6.875% Senior Secured Notes redeemed, to the applicable redemption date, if redeemed during the 12-month period beginning on March 15 of the years indicated below:

Year	Percentage
2017	103.438	%
2018	101.719	%
2019 and thereafter	100.000	%

The 6.875% Indenture contains customary affirmative and negative covenants, including limitations on indebtedness, liens, hedging agreements, investments, loans and advances, asset sales, mergers and acquisitions, dividends, transactions with affiliates, prepayments of other indebtedness, restrictions on subsidiaries, and issuance and repurchases of capital stock. As of March 31, 2017, the Company was in compliance with these covenants.

If at any time the 6.875% Senior Secured Notes are rated investment grade by Moody’s Investors Service, Inc. and Standard & Poor’s Ratings Group and no default or event of default has occurred and is continuing under the 6.875% Indenture, certain of the restrictive covenants will be suspended and will not apply to KCG or its restricted subsidiaries; provided, however, that such covenants will be reinstated if the 6.875% Senior Secured Notes subsequently cease to be rated or are no longer assigned an investment grade rating by both rating agencies.

The 6.875% Senior Secured Notes and the guarantee of the 6.875% Senior Secured Notes have not been registered under the Securities Act or the securities laws of any other jurisdiction and have no registration rights and may not be offered or sold in the United States absent registration or an applicable exemption from registration requirements.

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(Unaudited)

The Company has determined that the terms of the 6.875% Senior Secured Notes do not give rise to a bifurcatable derivative instrument under GAAP.

The Company incurred issuance costs of approximately $12.6 million in connection with the issuance of the 6.875% Senior Secured Notes. The issuance costs are recorded, net, within Debt on the Consolidated Statements of Financial Condition and are being amortized as interest expense over the remaining term of the 6.875% Senior Secured Notes. Including issuance costs and original issue discount, the 6.875% Senior Secured Notes had an effective yield of 7.590%. Of the above mentioned costs, $11.3 million was paid to a related party. See Footnote 11 "Related Parties" for additional information relating to financing and advising activities.

In the first quarter of 2016, the Company repurchased $35.0 million par value of 6.875% Senior Secured Notes in the open market for $31.2 million (including interest owed). The Company recorded a $3.7 million pre-tax gain within Investment income and other, net on the Consolidated Statements of Operations as a result of these repurchases. The gain on repurchase was net of accelerated original issue discount of $0.3 million and accelerated debt issuance costs of $0.7 million.

Revolving Credit Agreement

On June 5, 2015, KCG Americas LLC ("KCGA"), a wholly-owned broker dealer subsidiary of KCG, as borrower, and KCG, as guarantor, entered into a credit agreement (the "KCGA Facility Agreement”) with a consortium of banks. The KCGA Facility Agreement replaced the prior KCGA credit agreement, dated July 1, 2013, which was terminated as of June 5, 2015.

The KCGA Facility Agreement comprises two classes of revolving loans in a total aggregate committed amount of $355.0 million, including a swingline facility with a $50.0 million sub-limit, subject to two borrowing bases (collectively, the “KCGA Revolving Facility”): Borrowing Base A and Borrowing Base B (limited to a maximum loan amount of $115.0 million). The KCGA Revolving Facility also provides for future increases of the revolving credit facility of up to $145.0 million to a total of $500.0 million on certain terms and conditions.

Borrowings under the KCGA Revolving Facility bear interest, at the borrower's option, at a rate based on the federal funds rate (“Base Rate Loans”) or based on LIBOR (“Eurodollar Loans”), in each case plus an applicable margin. For each Base Rate Loan, the interest rate per annum is equal to the greater of the federal funds rate or an adjusted one-month LIBOR rate plus (a) for each Borrowing Base A loan, a margin of 1.50% per annum and (b) for each Borrowing Base B loan, a margin of 2.50% per annum. For each Eurodollar Loan, the interest rate per annum is equal to an adjusted LIBOR rate corresponding to an interest period of one, two or three months plus (a) for each Borrowing Base A loan, a margin of 1.50% per annum and (b) for each Borrowing Base B loan, a margin of 2.50% per annum. As of both March 31, 2017 and December 31, 2016, there were no outstanding borrowings under the KCGA Facility Agreement.

The proceeds of the Borrowing Base A loans may be used solely to finance the purchase and settlement of securities. The proceeds of Borrowing Base B loans may be used solely to fund clearing deposits with the National Securities Clearing Corporation ("NSCC").

KCGA is charged a commitment fee at a rate of 0.40% per annum on the average daily amount of the unused portion of the KCGA Facility Agreement.

The loans under the KCGA Facility Agreement will mature on June 5, 2017. The KCGA Revolving Facility is fully and unconditionally guaranteed on an unsecured basis by KCG and, to the extent elected by KCGA, any of its or KCG’s other subsidiaries. It is secured by first-priority pledges of and liens on certain eligible securities, subject to applicable concentration limits, in the case of Borrowing Base A loans, and by first-priority pledges of and liens on the right to the return of certain eligible NSCC margin deposits, in the case of Borrowing Base B loans.

The KCGA Facility Agreement includes customary affirmative and negative covenants, including limitations on indebtedness, liens, hedging agreements, investments, loans and advances, asset sales, mergers and acquisitions, dividends, transactions with affiliates, restrictions on subsidiaries, issuance of capital stock, negative pledges and business activities. It contains financial maintenance covenants establishing a minimum total regulatory capital for KCGA, a maximum total asset to total regulatory capital ratio for KCGA, a minimum excess net capital limit for KCGA, a minimum liquidity ratio for KCGA, and a minimum tangible net worth threshold for KCGA. As of March 31, 2017, the Company and KCGA were in compliance with these covenants.

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(Unaudited)

The KCGA Facility Agreement also contains events of default customary for facilities of its type, including: nonpayment of principal, interest, fees and other amounts when due, inaccuracy of representations and warranties in any material respect; violation of covenants; cross-default and cross-acceleration to material indebtedness; bankruptcy and insolvency events; material judgments; ERISA events; collateral matters; certain regulatory matters; and a “change of control”; subject, where appropriate, to threshold, notice and grace period provisions.

In connection with the KCGA Revolving Facility, the Company incurred issuance costs of $1.7 million which are recorded within Other assets on the Consolidated Statements of Financial Condition and are being amortized as interest expense over the term of the facility.

The Company recorded expenses with respect to its Debt as follows (in thousands):

	For the three months ended March 31,
	2017		2016
Interest expense	$	8,234	$	8,417
Amortization of debt issuance costs (1)	795		821
Commitment fee (2)	354		359
Accelerated amortization of debt issuance costs (3)	—		738
Accelerated interest expense on repurchase of debt (3)	—		298
Total	$	9,383	$	10,633

⁽¹⁾  Included within Interest expense on the Consolidated Statements of Operations.

⁽²⁾  Included within Other expense on the Consolidated Statements of Operations.

⁽³⁾  In conjunction with the repurchase of debt in the open market, the Company accelerated a prorated portion of its original issue discount and capitalized debt issuance costs. These costs have been netted against the gain on repurchase within Investment income and other, net on the Consolidated Statements of Operations for the three months ended March 31, 2016.

11. Related Parties

The Company interacts with Jefferies LLC, who is the beneficial owner of more than 10 percent of the outstanding KCG Class A Common Stock. The Company also has trading and other activities with certain investees for which it accounts for under the equity method of accounting or accounted for under the equity method at any time during the relevant accounting period. Each is considered a related party for the applicable periods. See Footnote 8 "Investments" for the carrying value of these investees at March 31, 2017 and December 31, 2016 and for the Company's income with respect to its equity earnings from these investees for the three months ended March 31, 2017 and 2016.

As noted in Footnote 8 "Investments", in 2016, the Company sold substantially all of its investment in Bats, which it accounted for under the equity method. As a result of the sales, Bats is no longer accounted for under the equity method, and beginning in 2017, Bats is no longer considered a related party.

The Company earns revenues, incurs expenses and maintains balances with these related parties or their affiliates in the ordinary course of business. As of the date and period indicated below, the Company had the following balances and transactions with its related parties or their affiliates (in thousands):

	For the three months ended March 31,
Statements of Operations	2017		2016
Revenues
Commissions and fees	$	1,868	$	6,663
Trading revenues, net	791		477
Interest, net	119		103
Total revenues from related parties	$	2,778	$	7,243
Expenses
Execution and clearance fees(1)	$	313	$	880
Communications and data processing	5,610		3,206
Payment for order flow	—		5
Collateralized financing interest	86		78
Other expense	—		5
Total expenses incurred with respect to related parties	$	6,009	$	4,174

⁽¹⁾  Represents net volume based fees paid or received by KCG for taking or providing liquidity to related trading venues. Volume based fees will vary period to period based on usage.

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(Unaudited)

Statements of Financial Condition	March 31, 2017		December 31, 2016
Assets
Securities borrowed	$	17,754	$	5,293
Receivable from brokers, dealers and clearing organizations	2,134		2,106
Other assets	16		62,906
Liabilities
Securities loaned	$	2,063	$	2,594
Payable to brokers, dealers and clearing organizations	45		188
Accrued expenses and other liabilities	122		3,708

In the three months ended March 31, 2017 and 2016, the Company paid $19,000 and $36,000, respectively, in fees to Jefferies LLC for acting as broker in connection with the Company's stock buyback program. Such fees are recorded within Treasury stock, at cost in the Consolidated Statements of Financial Condition at both March 31, 2017 and December 31, 2016 and are not included in the above table.

See Footnote 15 "Warrants and Stock Repurchase" for additional information on stock repurchases.

See Footnote 1 “Organization and Description of the Business” for further information regarding the Merger.

12. Stock-Based Compensation

KCG Equity Incentive Plan

The KCG Holdings, Inc. 2015 Amended and Restated Equity Incentive Plan (the "Amended 2015 Plan") is maintained by the Company for the purpose of granting incentive awards to officers, employees and directors of the Company. As of March 31, 2017, there were approximately 23.2 million shares authorized for issuance under the Amended 2015 Plan, of which approximately 13.6 million shares are available for grant (subject to adjustment as provided under the Amended 2015 Plan).

The Amended 2015 Plan is administered by the Compensation Committee of the Company's Board of Directors, and allows for the grant of stock options, stock appreciation rights ("SARs"), restricted stock, RSUs and cash-based awards (collectively, the “awards”), as defined by the Amended 2015 Plan. In addition to overall limitations on the aggregate number of awards that may be granted, the Amended 2015 Plan also limits the number of awards that may be granted to a single individual.

Restricted Shares and Restricted Stock Units

The Company has historically awarded RSUs to eligible officers, employees and directors as a component of annual incentive compensation ("Annual Equity Awards"), and has also made off-cycle grants of RSUs for purposes of one-time, special or retention awards ("Off-Cycle Grants"). The majority of RSUs that have been granted by the Company vest ratably over three years and are subject to accelerated vesting, or continued vesting, following the grantee’s termination of employment, in accordance with the applicable award documents and employment agreements between the Company and the grantee.

RSUs granted as Annual Equity Awards provide for the continued vesting of such RSUs following a voluntary resignation of employment, subject to the grantee's ongoing compliance with non-competition and non-solicitation requirements through the duration of the vesting period. As such, the Annual Equity Awards are considered not to have a service condition from an expense perspective. The Company recognizes the expense associated with the RSUs expected to be granted by the Company early in the following year for the current year's annual incentive compensation in the current year.

The Company measures compensation expense related to Off-Cycle Grants based on the fair value of KCG Class A Common Stock at the date of grant. When accruing compensation expense over the duration of a performance year prior to the grant of Annual Equity Awards for that year, the Company accrues compensation expense based on the estimated value of such future awards. For example, prior to granting the RSUs that are expected to be awarded by the Company in early 2018 as a component of annual incentive compensation for the 2017 performance year, the Company will accrue compensation expense for such awards over the year ended December 31, 2017, based on the estimated value of such awards. The amount accrued during the year for Annual Equity Awards is included in Accrued compensation expense on the Consolidated Statements of Financial Condition.

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(Unaudited)

Compensation expense relating to RSUs, which is primarily recorded in Employee compensation and benefits, and the corresponding income tax benefit, which is recorded in Income tax (benefit) expense on the Consolidated Statements of Operations are presented in the following table (in thousands):

	For the three months ended March 31,
	2017		2016
Stock award compensation expense	$	2,438	$	17,053
Income tax benefit	926		6,480

The following table summarizes restricted awards activity for the three months ended March 31, 2017 (awards in thousands):

	Restricted Stock Units
	Number of Units		Weighted- Average Grant date Fair Value
Outstanding at December 31, 2016	5,563		$	11.25
Granted	800		14.27
Vested	(2,634	)	11.19
Forfeited	(72	)	12.10
Outstanding at March 31, 2017	3,657		$	11.93

There was $5.6 million of unamortized compensation related to unvested RSUs at March 31, 2017 that are related to Off-Cycle Grants. The cost of these unvested RSUs is expected to be recognized over a weighted average life of 1.6 years.

Stock Options and Stock Appreciation Rights

The Company’s policy is to grant options for the purchase of shares of KCG Class A Common Stock and SARs to purchase or receive the cash value of shares of KCG Class A Common Stock. The stock options and SARs outstanding as of the date hereof have each been granted with an exercise price not less than the market value of KCG Class A Common Stock on the grant date and generally vest ratably over a three year period and expire on the fifth or tenth anniversary of the grant date, pursuant to the terms of the applicable award agreement. Like RSUs, stock options and SARs are subject to accelerated vesting, or continued vesting following certain termination circumstances, in accordance with the applicable award agreements and employment agreements between the Company and the grantee. The Company issues new shares upon stock option exercises by its employees and directors, and may either issue new shares or provide a cash payment upon SARs exercises by its employees.

The Company estimates the fair value of each stock option and SAR granted as of its respective grant date using the Black-Scholes option-pricing model. The principal assumptions utilized in valuing stock options and SARs and the methodology for estimating the inputs to such model include: 1) risk-free interest rate, the estimate of which is based on the yield of U.S. zero coupon securities with a maturity equal to the expected life of the stock option or SAR; 2) expected volatility, the estimate of which is based on several factors including implied volatility of market-traded stock options on the Company’s common stock on the grant date and the volatility of the Company’s common stock; and 3) expected option or SAR life, the estimate of which is based on internal studies of historical experience and projected exercise behavior based on different employee groups and specific stock option and SAR characteristics, including the effect of employee terminations. There were no stock options or SARs granted during the three months ended March 31, 2017 or 2016.

Compensation expense relating to stock options and SARs, all of which was recorded in Employee compensation and benefits, as well as the corresponding income tax (benefit) expense, which is recorded in Income tax expense on the Consolidated Statements of Operations are as follows (in thousands):

	For the three months ended March 31,
	2017		2016
Stock option and SAR compensation expense	$	122	$	134
Income tax benefit	46		51

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(Unaudited)

The following table summarizes stock option and SAR activity and stock options exercisable for the three months ended March 31, 2017 (awards in thousands):

	Number of Stock Awards		Weighted- Average Exercise Price		Aggregate Intrinsic Value		Weighted- Average Remaining Life (years)
Outstanding at December 31, 2016 (1)	6,298		$	18.88
Granted	—		—
Exercised	(337	)	8.24
Forfeited or expired	(94	)	53.56
Outstanding at March 31, 2017 (1)	5,867		$	19.03	$	14,269	2.23
Exercisable at March 31, 2017	4,492		$	17.75	$	14,269	1.69
Available for future grants at March 31, 2017 (2)	13,630

⁽¹⁾ Includes 1.7 million SARs.

⁽²⁾ Represents shares available for grant of options, SARs, RSUs and other awards under the Amended 2015 Plan.

The aggregate intrinsic value is the amount by which the closing price of KCG Class A Common Stock exceeds the exercise price of the stock options or SARs, as applicable, multiplied by the number of shares underlying such award. The total intrinsic value and cash received from stock options exercised during the three months ended March 31, 2017 is $2.2 million and $2.8 million, respectively. There were no stock options or SARs exercised during the three months ended March 31, 2016.

There is $0.5 million of unamortized compensation related to unvested stock options at March 31, 2017. The cost of these unvested awards is expected to be recognized over a weighted average life of 1.25 years.

Incentive units

Prior to the 2013 Mergers, GETCO awarded deferred compensation to its employees in the form of incentive units that generally vested over time. The value of these incentive units was determined at the date of grant based on the estimated enterprise value of GETCO and the amount expensed was determined based on this valuation multiplied by the percent vested. In connection with the 2013 Mergers, all outstanding unvested incentive units vested and were converted into units based on the applicable exchange ratio of GETCO units to KCG Class A Common Stock. The units are marked to the current stock price of KCG Class A Common Stock at the end of each period with the resulting change in the liability reflected as either an expense or benefit included in Employee compensation and benefits on the Consolidated Statements of Operations. Given that the units vested in connection with the 2013 Mergers, the Company fully amortized the costs associated with these units as of June 30, 2013. Deferred compensation payable at March 31, 2017 and December 31, 2016 related to incentive units were $2.7 million and $2.3 million, respectively, and is included in Accrued compensation expense on the Consolidated Statements of Financial Condition.

The following is a summary of the changes in the incentive units for the three months ended March 31, 2017 (units in thousands):

	Vested
Incentive units at December 31, 2016	16
Issued	—
Vested	(1	)
Exercised	—
Canceled	—
Incentive units at March 31, 2017	15

Compensation expense (benefit) related to the Incentive units which are recorded within Employee compensation and benefits on the Consolidated Statements of Operations are as follows (in thousands):

	For the three months ended March 31,
	2017		2016
Incentive units	$	437	$	(77	)

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(Unaudited)

13. Income Taxes

The Company and its subsidiaries will file a consolidated federal income tax return as well as combined state income tax returns in certain jurisdictions. In other jurisdictions, the Company and its subsidiaries will file separate company state and local income tax returns.

The Company’s effective tax rate was a benefit of 894% on a pre-tax loss for the three months ended March 31, 2017. This rate differed from the federal statutory rate of 35% primarily due to the recognition of $3.5 million of excess tax benefits for stock based compensation awards that vested or were exercised in the first quarter of 2017, offset, in part, by state and local taxes, and the effect of nondeductible expenses. The Company’s effective tax rate of 38.0% for the three months ended March 31, 2016 differed from the federal statutory rate of 35% primarily due to state and local taxes and the effect of nondeductible expenses including certain compensation and meals and entertainment. As noted in footnote 2 "Significant Accounting Policies", effective January 1, 2017, the Company adopted a new ASU that requires excess tax benefits or deficiencies to be recorded as income tax benefit or expense in the period in which they are realized.

Deferred income taxes reflect the net tax effects of temporary differences between the financial reporting and tax bases of assets and liabilities and are measured using the enacted tax rates and laws that will be in effect when such differences are expected to reverse. Valuation allowances recorded on the balance sheet dates are necessary in cases where management believes that it is more likely than not that some portion or all of the deferred tax assets will not be realized.

As of March 31, 2017, the Company is subject to U.S. Federal income tax examinations for the tax years 2013 through 2016, and to non-U.S. income tax examinations for the tax years 2007 through 2016. In addition, the Company is subject to state and local income tax examinations in various jurisdictions for the tax years 2007 through 2016. The final outcome of these examinations is not yet determinable. However, the Company anticipates that adjustments to the unrecognized tax benefits, if any, will not result in a material change to the results of operations or financial condition.

At March 31, 2017, the Company had $5.3 million of unrecognized tax benefits, all of which would affect the Company's effective tax rate if recognized. At December 31, 2016, the Company had $5.1 million of unrecognized tax benefits, all of which would affect the Company’s effective tax rate if recognized.

The Company's policy for recording interest and penalties associated with audits is to record such items as a component of income or loss before income taxes. Penalties, if any, are recorded in Other expenses and interest paid or received is recorded in Debt interest expense and Interest, net, respectively, on the Consolidated Statements of Operations.

14. Accumulated Other Comprehensive Income

The following table presents changes in Accumulated other comprehensive (loss) income, net of tax by component for the three months ended March 31, 2017 and 2016 (in thousands):

	Unrealized Gains (Losses) on Available-for-Sale Securities			Foreign Currency Translation Adjustments			Total
Balance, December 31, 2016	$	3,286		$	(1,039	)	$	2,247
Other comprehensive income	170			437			607
Amount reclassified from Available-for-sale securities, net of tax	(2,956		)	—			(2,956		)
Balance March 31, 2017	$	500		$	(602	)	$	(102	)

	Unrealized Gains on Available-for-Sale Securities		Foreign Currency Translation Adjustments			Total
Balance, December 31, 2015	$	150	$	200		$	350
Other comprehensive income (loss)	68		(133		)	(65		)
Balance March 31, 2016	$	218	$	67		$	285

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(Unaudited)

The following table presents the effects of reclassifications out of Accumulated Other Comprehensive (Loss) Income and into the Consolidated Statements of Operations for the three months ended March 31, 2017 (in thousands):

Details about Accumulated Other Comprehensive Income Components	Amounts Reclassified from Other Comprehensive Income			Affected Line Item in the Consolidated Statement of Operations where Net Income is Presented
Available-for-sale securities:
Reclassification of unrealized net gains	4,767			Investment income and other, net
Related income tax expense	(1,811		)	Income tax (benefit) expense
	$	2,956		Net of tax

The reclassification is a result of the Company's sale of its remaining shares of Bats, which was accounted for as an available for sale security prior to its sale. See Footnote 8 "Investments" for additional information on the reclassification.

15. Warrants and Stock Repurchases

Warrants

As a portion of the consideration in the 2013 Mergers, former GETCO unitholders received, in addition to KCG Class A Common Stock, 24.3 million Class A, Class B and Class C Warrants, which were issued in accordance with the Warrant Agreement, dated July 1, 2013, between KCG and Computershare Shareowner Services LLC (the “Warrant Agreement”) and which are subject to the terms and conditions of the Warrant Agreement.

The Warrant Agreement includes various anti-dilution and similar provisions that require adjustments to the exercise prices of the Class A, Class B and Class C Warrants and/or the number of shares of KCG Class A Common Stock issuable upon exercise of the Warrants upon certain events and actions taken by the Company, including the Company’s repurchase of KCG Class A Common Stock through a public tender offer.

As a result of the Company's "modified dutch auction" tender offer ("Tender Offer") in the second quarter of 2015, the exercise price of each of the Class A, Class B and Class C Warrants was adjusted in accordance with the terms of the Warrant Agreement. All other terms of the Warrants remained the same.

The adjusted exercise price for each class of Warrants and the activity for the three months ended March 31, 2017 were as follows (Warrants in thousands):

	Class A			Class B			Class C
Original Exercise Price	$	12.00		$	13.50		$	15.00
Adjusted Exercise Price	$	11.70		$	13.16		$	14.63
Initial term (years)	4			5			6
Expiration	7/1/2017			7/1/2018			7/1/2019
										Total
Warrants - Outstanding at December 31, 2016	2,026			2,069			2,087			6,182
Exercised	(545		)	(44		)	(44		)	(633	)
Repurchased	(359		)	(359		)	(359		)	(1,077	)
Warrants - Outstanding at March 31, 2017	1,122			1,666			1,684			4,472

The Company repurchased, from GA, 1.1 million Warrants for $2.9 million in the first quarter of 2017. During the first quarter of 2016, the Company repurchased 1.5 million Warrants for $1.0 million.

See Footnote 8 "Investments" and Footnote 11 "Related Parties" for more information on warrant repurchases from related parties and not under the Company's Board approved program.

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(Unaudited)

Stock Repurchases

During the first quarter of 2017, the Company repurchased 0.9 million shares of KCG Class A Common Stock for $13.3 million under the Company's Board approved program. As of March 31, 2017, approximately $136.8 million in authority remained under the current share repurchase program, which is subject to the restrictive covenants in the 6.875% Senior Secured Notes Indenture.

During the first quarter of 2016, the Company repurchased 1.8 million shares of KCG Class A Common Stock for $20.5 million.

16. Earnings Per Share

Basic earnings or loss per common share (“EPS”) has been calculated by dividing net income or loss by the weighted average shares of KCG Class A Common Stock outstanding during each respective period. Diluted EPS reflects the potential reduction in EPS using the treasury stock method to reflect the impact of common stock equivalents if stock options, SARs and Warrants were exercised and restricted awards were to vest.

The number of such RSUs, options, Warrants and SARs excluded from the EPS calculation was approximately 3.8 million and 23.8 million for the three months ended March 31, 2017 and 2016, respectively. Such RSUs, options, Warrants and SARs were excluded from the EPS calculation as their inclusion would have an anti-dilutive impact on the EPS calculation. The computation of diluted shares can vary among periods due in part to the change in the average price of the KCG Class A Common Stock. See Footnote 2 "Significant Accounting Policies" for more information related to a recently adopted ASU affecting the impact of excess tax benefits in calculating diluted EPS.

The following is a reconciliation of the numerators and denominators of the basic and diluted earnings per share computations for the three months ended March 31, 2017 and 2016 (in thousands, except per share amounts):

	For the three months ended March 31,
	2017				2016
	Numerator  / net income		Denominator /     shares		Numerator  / net income		Denominator /  shares
Income and shares used in basic calculations	$	3,212	66,306		$	37,165	88,458
Effect of dilutive stock based awards
Restricted awards and warrants			800				992
Stock options and SARs			536				155
Income and shares used in diluted calculations	$	3,212	67,642		$	37,165	89,605
Basic earnings per common share			$	0.05			$	0.42
Diluted earnings per common share			$	0.05			$	0.41

17. Significant Clients

The Company considers significant clients to be those clients who account for 10% or more of the total U.S. equity market making dollar value traded by the Company. No clients accounted for more than 10% of the Company’s U.S. equity dollar value traded during the three months ended March 31, 2017 and 2016.

18. Commitments and Contingent Liabilities

Legal Proceedings

In the ordinary course of business, the nature of the Company’s business subjects it to claims, lawsuits, regulatory examinations or investigations and other proceedings. The Company and its subsidiaries are subject to several of these matters at the present time. Given the inherent difficulty of predicting the outcome of litigation and regulatory matters, particularly in regulatory examinations or investigations or other proceedings in which substantial or indeterminate damages or fines are sought, or where such matters are in the early stages, the Company cannot estimate losses or ranges of losses for such matters where there is only a reasonable possibility that a loss may be incurred. In addition, there are numerous factors that result in a greater degree of complexity in class-action lawsuits as compared to other types of litigation. Due to the many intricacies involved in class-action lawsuits particularly in the early stages of such matters, obtaining clarity on a reasonable estimate is difficult which may call into question its reliability. There can be no assurance that these matters will not have a material adverse effect on the Company’s results of operations in any future period, and a material judgment, fine or sanction could have a material adverse

37

KCG HOLDINGS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - CONTINUED

(Unaudited)

impact on the Company’s financial condition and results of operations. However, it is the opinion of management, after consultation with legal counsel that, based on information currently available, the ultimate outcome of these matters will not have a material adverse impact on the business, financial condition or operating results of the Company although they might be material to the operating results for any particular reporting period. The Company carries directors’ and officers’ liability insurance coverage for potential claims, including securities actions, against the Company, Knight and GETCO and their respective directors and officers.

Other Legal and Regulatory Matters

The Company owns subsidiaries including regulated entities that are subject to extensive oversight under federal, state and applicable international laws as well as self-regulatory organization ("SRO") rules. Changes in market structure and the need to remain competitive require constant changes to the Company's systems and order handling procedures. The Company makes these changes while continuously endeavoring to comply with many complex laws and rules. Compliance, surveillance and trading issues common in the securities industry are monitored by, reported to, and/or reviewed in the ordinary course of business by the Company's regulators in the U.S. and abroad. As a major order flow execution destination, the Company is named from time to time in, or is asked to respond to a number of regulatory matters brought by U.S. regulators, foreign regulators, SROs, as well as actions brought by private plaintiffs, which arise from its business activities. There has recently been an increased focus by regulators on Anti-Money Laundering and sanctions compliance by broker-dealers and similar entities, as well as an enhanced interest on suspicious activity reporting and transactions involving microcap securities. In addition, there has been an increased focus by Congress, federal and state regulators, SROs and the media on market structure issues, and in particular, high frequency trading, best execution, internalization, ATS manner of operations, market fragmentation and complexity, colocation, access to market data feeds and remuneration arrangements, such as payment for order flow and exchange fee structures. The Company has received information requests from various authorities, including the SEC, requesting, among other items, information regarding these market structure matters, which the Company is in the process of responding.

The Company is currently the subject of various regulatory reviews and investigations by federal, state and foreign regulators and SROs, including the SEC, the U.S. Department of Justice, the Financial Industry Regulatory Authority, Inc. and the Financial Conduct Authority ("FCA"). In some instances, these matters may rise to a disciplinary action and/or a civil or administrative action. For example, the Autorité des Marchés Financiers ("AMF") recently completed an investigation of GETCO’s trading activities on Euronext for the period 2010 to 2012. In a decision, dated July 8, 2016, the AMF's enforcement committee imposed a €400,000 monetary penalty on GETCO which the Company decided not to appeal. The Company fully reserved for the monetary penalty in the second quarter of 2016 and anticipates paying the fine later in 2017.

Capital Leases

The Company enters into capitalized lease obligations related to certain computer equipment. These obligations represent drawdowns under a revolving secured lending facility with a single lender. At March 31, 2017, the obligations have a weighted-average interest rate of 4.42% per annum and are on varying 3-year terms. The carrying amounts of the capital lease obligations approximate fair value and is recorded in Accrued expenses and other liabilities on the Consolidated Statements of Financial Condition. The future minimum payments including interest under the capitalized leases at March 31, 2017 consist of (in thousands):

	Minimum Payments
Nine months ending December 31, 2017	$	5,625
Year ending December 31, 2018	7,272
Year ending December 31, 2019	7,272
Year ending December 31, 2020	1,103
Total	$	21,272

The total interest expense related to capital leases for the three months ended March 31, 2017 and 2016 included in Debt interest expense on the Consolidated Statements Operations is as follows (in thousands):

	For the three months ended March 31,
	2017		2016
Interest expense - Capital leases	$	24	$	24

38

KCG HOLDINGS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - CONTINUED

(Unaudited)

Operating Leases

The Company leases office space under noncancelable operating leases. Certain office leases contain fixed dollar-based escalation clauses. Rental expense under the office leases was $4.7 million and $6.1 million for the three months ended March 31, 2017 and 2016, respectively, and is included in Occupancy and equipment rentals on the Consolidated Statements of Operations. The Company also subleases certain of its excess capacity to third parties and collects sublease income on such premises. Such income is part of lease loss accruals included within Accrued expenses and other liabilities on the Consolidated Statements of Financial Condition.

The Company leases certain computer and other equipment under noncancelable operating leases. As of March 31, 2017, future minimum rental commitments under all noncancelable office, computer and equipment leases (“Gross Lease Obligations”), and sublease income were as follows (in thousands):

	Gross Lease Obligations		Sublease Income		Net Lease Obligations
Nine months ending December 31, 2017	$	22,057	$	4,573	$	17,484
Year ending December 31, 2018	27,978		5,850		22,128
Year ending December 31, 2019	25,031		5,229		19,802
Year ending December 31, 2020	23,310		4,056		19,254
Year ending December 31, 2021	22,771		4,039		18,732
Thereafter through December 31, 2031	154,234		10,096		144,138
Total	$	275,381	$	33,843	$	241,538

Contract Obligations

During the normal course of business, the Company collateralizes certain leases or other contractual obligations through letters of credit or segregated funds held in escrow accounts. At March 31, 2017, the Company had provided letters of credit for $10.2 million, collateralized by cash, as a guarantee for several of its lease obligations and for a trading JV. In the ordinary course of business, KCG also has provided, and may provide in the future, unsecured guarantees with respect to the payment obligations of certain of its subsidiaries under trading, repurchase, financing and stock loan arrangements, as well as under certain leases.

Guarantees

The Company is a member of exchanges that trade and clear futures contracts. Associated with its memberships, the Company may be required to pay a proportionate share of the financial obligations of another member who may default on its obligations to the exchange. Although the rules governing different exchange memberships vary, in general the Company’s guarantee obligations would arise only if the exchange had previously exhausted its resources. In addition, any such guarantee obligation would be apportioned among the other nondefaulting members of the exchange. Any potential contingent liability under these membership agreements cannot be estimated. The Company has not recorded any contingent liability in the financial statements for these agreements and management believes that any potential requirement to make payments under these agreements is remote.

There were no compensation guarantees at March 31, 2017 or December 31, 2016 that extended beyond the respective year end.

Representations and Warranties

In the normal course of its operations, the Company enters into contracts that contain a variety of representations and warranties which provide general indemnifications. The Company’s maximum exposure under these arrangements is unknown, as this would involve future claims that may be made against the Company that have not yet occurred. However, based on experience, the Company believes the risk of significant loss is minimal.

Urban, the reverse mortgage origination and securitization business that was sold by KCG in November 2013, has advised KCG that it will seek indemnification from KCG for losses on certain loans that were underwritten prior to KCG’s disposition of Urban. This potential obligation relates to approximately 40 loans which have been identified as either loans pursuant to which Urban was required to provide an indemnification to the U.S. Department of Housing and Urban Development (“HUD”) in the event the loans sustained losses or as not qualifying for HUD insurance. Based on information currently available, KCG estimates that its maximum exposure to losses with respect to reimbursing Urban for any potential losses on these loans will not exceed $10.1 million. The Company has not recorded any liabilities related to these potential losses as of March 31, 2017.

39

KCG HOLDINGS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - CONTINUED

(Unaudited)

The activity in the liability accounts related to the Company’s lease losses and lease terminations for its U.S. leases are recorded in Accrued expenses and other liabilities on the Consolidated Statements of Financial Condition as follows (in thousands):

	For the three months ended March 31, 2017			For the year ended December 31, 2016
Balance as of beginning of period	$	14,251		$	18,892
Real estate charges incurred	—			390
Payments made, net	(1,566		)	(3,750		)
Other charges	884			(1,281		)
Balance as of end of period	$	13,569		$	14,251

19. Financial instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk

As a market maker in global equities, fixed income, futures, options, commodities and currencies, the majority of the Company’s securities transactions are conducted as principal or riskless principal with broker dealers and institutional counterparties primarily located in the United States. The Company self-clears substantially all of its U.S. equity and option securities transactions. The Company clears a portion of its securities transactions through third party clearing brokers. Foreign transactions are settled pursuant to global custody and clearing agreements with major U.S. banks. Substantially all of the Company’s credit exposures are concentrated with its clearing brokers, broker dealer and institutional counterparties. The Company’s policy is to monitor the credit standing of counterparties with which it conducts business.

Financial instruments sold, not yet purchased, at fair value represent obligations to purchase such securities (or underlying securities) at a future date. The Company may incur a loss if the market value of the securities subsequently increases.

The Company currently has no loans outstanding to any former or current executive officer or director.

20. Business Segments

As of March 31, 2017, the Company's operating segments comprised the following: (i) Market Making; (ii) Global Execution Services; and (iii) Corporate and Other.

The Market Making segment principally consists of market making in the cash, futures and options markets across global equities, options, fixed income, currencies and commodities. As a market maker, the Company commits capital on a principal basis by offering to buy securities from, or sell securities to, broker dealers, banks and institutions. The Company engages in principal trading in the Market Making segment direct to clients as well as in a supplemental capacity on exchanges, ECNs and ATSs. The Company is an active participant on all major global equity and futures exchanges and also trades on substantially all domestic electronic options exchanges. As a complement to electronic market making, the cash trading business handles specialized orders and also transacts on the OTC Bulletin Board marketplaces operated by the OTC Markets Group Inc. and the AIM.

Results for the Company's former retail U.S. options market making business and DMM business are included in Market Making segment up to the date of its sale in 2016.

The Global Execution Services segment comprises agency-based trading and trading venues, offering execution services in global equities, options, futures and fixed income on behalf of institutions, banks and broker dealers. The Company earns commissions as an agent on behalf of clients as well as between principals to transactions; in addition, the Company will commit capital on behalf of clients as needed. Agency-based, execution-only trading in the segment is done primarily through a variety of access points including: (i) algorithmic trading and order routing in global equities and options; (ii) institutional sales traders executing program, block and riskless principal trades in global equities and ETFs; (iii) a fixed income ECN that also offers trading applications; and (iv) an ATS for U.S. equities.

In September 2016, the Company completed the acquisition of Neonet. Neonet is an independent agency broker and execution specialist based in Stockholm, Sweden. The results of Neonet, beginning on the date of acquisition, are included in this segment.

The Corporate and Other segment contains the Company's investments, principally in strategic trading-related opportunities; manages the deployment of capital across the organization; houses executive management functions; and maintains corporate overhead expenses and all other income and expenses that are not attributable to the

40

KCG HOLDINGS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - CONTINUED

(Unaudited)

Company's other segments. The Corporate and Other segment also contains functions that support the Company’s other segments such as self-clearing services, including stock lending activities.

The Company’s revenues, income (loss) before income taxes (“Pre-tax earnings”) and total assets by segment are summarized in the following table (in thousands):

	Market Making		Global Execution Services		Corporate and Other (1)			Consolidated Total
For the three months ended March 31, 2017:
Revenues	$	174,656	$	70,756	$	9,961		$	255,373
Pre-tax earnings	18,023		1,994		(20,421		)	(404		)
Total assets	5,255,849		1,001,933		(274,353		)	5,983,429
For the three months ended March 31, 2016:
Revenues	$	258,918	$	76,394	$	10,112		$	345,424
Pre-tax earnings	75,489		6,261		(21,785		)	59,965
Total assets	4,999,201		1,020,306		176,791			6,196,298

⁽¹⁾  Amounts shown in the Corporate and Other segment include eliminations of income statement and balance sheet items included in the Company's other segments.

Included in total assets within Market Making and Corporate and Other at March 31, 2016 is $16.4 million and $8.1 million, respectively, related to Assets of businesses held for sale.

21. Subsequent Events

As noted in Footnote 1, "Organization and Description of Business", on April 20, 2017, the Company announced that it has reached a definitive agreement for Virtu to acquire all outstanding shares of KCG’s Class A Common Stock for $20.00 per share in cash (the “Merger Consideration”). In addition, at the Effective Time, (i) each stock option of the Company that is outstanding and unexercised immediately before the Effective Time will be cancelled in consideration for the right to receive a cash payment equal to the excess, if any, of the Merger Consideration over the exercise price of such stock option; (ii) each stock appreciation right of the Company that is outstanding and unexercised immediately before the Effective Time will be canceled in consideration for the right to receive a cash payment equal to the excess, if any, of the Merger Consideration over the exercise price of such stock appreciation right; (iii) each restricted share unit of the Company will become fully vested (contingent upon the closing of the Merger) and cancelled and converted into the right to receive the Merger Consideration; and (iv) the right of each holder of a warrant of the Company that is outstanding immediately before the Effective Time to receive shares of KCG Class A Common Stock upon exercise of each such warrant will be converted into the right to receive, upon exercise of each such warrant, a cash payment equal to the excess, if any, of the Merger Consideration over the exercise price of such warrant.

The transaction is expected to be completed in the third quarter of 2017, subject to the approval by KCG’s and Virtu’s stockholders, customary regulatory approvals and the satisfaction of customary closing conditions.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

Cautionary Statement Regarding Forward-Looking Information

Certain statements contained in this Quarterly Report on Form 10-Q, including without limitation, those under “Management’s Discussion and Analysis of Financial Condition and Results of Operations” herein (“MD&A”), “Quantitative and Qualitative Disclosures About Market Risk” in Part I, Item 3, “Legal Proceedings” and "Risk Factors" in Part II and the documents incorporated by reference herein may constitute "forward-looking statements" within the meaning of the safe harbor provisions of the U.S. Private Securities Litigation Reform Act of 1995. Forward-looking statements are typically identified by words such as “believe,” “expect,” “anticipate,” “intend,” “target,” “estimate,” “continue,” “positions,” “prospects” or “potential,” by future conditional verbs such as “will,” “would,” “should,” “could” or “may,” or by variations of such words or by similar expressions. These forward-looking statements are not historical facts and are based on current expectations, estimates and projections about KCG Holdings, Inc.’s (the “Company” or “KCG”) industry, management’s beliefs and certain assumptions made by management, many of which, by their nature, are inherently uncertain and beyond the Company's control. Accordingly, readers are cautioned that any such forward-looking statements are not guarantees of future performance and are subject to certain risks, uncertainties and assumptions that are difficult to predict including, without limitation, risks associated with: (i) the inability to manage trading strategy performance and grow revenue and earnings; (ii) the receipt of additional payments from the sale of KCG Hotspot that are subject to certain contingencies; (iii) changes in market structure, legislative, regulatory or financial reporting rules, including the increased focus by Congress, federal and state regulators, SROs and the media on market structure issues, and in particular, the scrutiny of high frequency trading, best execution, internalization, alternative trading systems, market fragmentation, colocation, access to market data feeds, and remuneration arrangements such as payment for order flow and exchange fee structures; (iv) past or future changes to KCG’s organizational structure and management; (v) KCG’s ability to develop competitive new products and services in a timely manner and the acceptance of such products and services by KCG’s customers and potential customers; (vi) KCG’s ability to keep up with technological changes; (vii) KCG’s ability to effectively identify and manage market risk, operational and technology risk, cybersecurity risk, legal risk, liquidity risk, reputational risk, counterparty and credit risk, international risk, regulatory risk, and compliance risk; (viii) the cost and other effects of material contingencies, including litigation contingencies, and any adverse judicial, administrative or arbitral rulings or proceedings; (ix) the effects of increased competition and KCG’s ability to maintain and expand market share; (x) the migration of KCG’s Jersey City, NJ data center operations to other commercial data centers and colocations; (xi) the completion of the proposed Merger in a timely manner or at all; (xii) obtaining required governmental approvals of the proposed Merger on the terms expected or on the anticipated schedule; (xiii) KCG’s stockholders failing to approve the proposed Merger; (xiv) the parties to the Merger Agreement failing to satisfy other conditions to the completion of the proposed Merger, or failing to meet expectations regarding the timing and completion of the proposed Merger; the occurrence of any event, change or other circumstance that could give rise to the termination of the Merger Agreement; (xv) the effect of the announcement or pendency of the proposed Merger on KCG s business relationships, operating results, and business generally; (xvi) risks that the proposed Merger disrupts current operations of KCG and potential difficulties in KCG employee retention as a result of the proposed Merger; (xvii) risks related to diverting management’s attention from KCG s ongoing business operations; (xviii) the outcome of any legal proceedings that may be instituted against KCG related to the Merger Agreement or the proposed Merger; and (xix) the amount of the costs, fees, expenses and other charges related to the proposed Merger. The list above is not exhaustive. Because forward-looking statements involve risks and uncertainties, the actual results and performance of the Company may materially differ from the results expressed or implied by such statements. Given these uncertainties, readers are cautioned not to place undue reliance on such forward-looking statements. Unless otherwise required by law, the Company also disclaims any obligation to update its view of any such risks or uncertainties or to announce publicly the result of any revisions to the forward-looking statements made herein. Readers should carefully review the risks and uncertainties disclosed in the Company’s reports with the SEC, including those detailed under “Certain Factors Affecting Results of Operations” in this MD&A and in “Risk Factors” in Part I, Item 1A of KCG's Annual Report on Form 10-K for the year ended December 31, 2016 and in other reports or documents the Company files with, or furnishes to, the SEC from time to time. This information should be read in conjunction with the Company’s Consolidated Financial Statements and the Notes thereto contained in this Quarterly Report on Form 10-Q, and in other reports or documents the Company files with, or furnishes to, the SEC from time to time.

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Executive Overview

We are a leading independent securities firm offering clients a range of services designed to address trading needs across asset classes, product types and time zones. We combine advanced technology with specialized client service across market making, agency execution and trading venues and also engage in principal trading via exchange-based electronic market making. We have multiple access points to trade global equities, options, futures, fixed income, currencies and commodities via voice or automated execution.

Pending Merger with Virtu

On April 20, 2017, the Company entered into an Agreement and Plan of Merger (the “Merger Agreement”) with Virtu Financial, Inc., a Delaware corporation (“Virtu”) and Orchestra Merger Sub, Inc., a Delaware corporation and indirect wholly owned subsidiary of Virtu (“Merger Sub”). The Merger Agreement provides for the merger of Merger Sub with and into the Company (the “Merger”), with the Company surviving the Merger as a wholly owned subsidiary of Virtu. Pursuant to the Merger Agreement, Virtu will finance the Merger Consideration with a combination of equity and debt financing. The Merger is expected to close during the third quarter of 2017 and is subject to the approval of our stockholders and the satisfaction of customary closing conditions, including applicable regulatory approvals. Concurrently with the execution of the Merger Agreement, Virtu entered into a voting agreement with Jefferies, a stockholder of the Company, which requires Jefferies to, among other things, vote all of its shares of KCG Class A Common Stock in favor of adoption of the Merger Agreement.

For additional information related to the Merger Agreement, please refer to our Current Report on Form 8-K filed with the SEC on April 21, 2017 and Footnote 1 “Organization and Description of the Business” included in Part I, Item 1 “Financial Statements (Unaudited)” of this Form 10-Q for further discussion of the Merger and the Merger Agreement.

Results of Operations

As of March 31, 2017, our operating segments comprised the following:

• Market Making— Our Market Making segment principally consists of market making in the cash, futures and options markets across global equities, options, fixed income, currencies and commodities. As a market maker, we commit capital on a principal basis by offering to buy securities from, or sell securities to, broker dealers, banks and institutions. We engage in principal trading in the Market Making segment direct to clients as well as in a supplemental capacity on exchanges, ECNs and ATSs. We are an active participant on all major global equity and futures exchanges and we also trade on substantially all domestic electronic options exchanges. As a complement to electronic market making, our cash trading business handles specialized orders and also transacts on the OTC Bulletin Board marketplaces operated by the OTC Markets Group Inc. and the AIM.

• Global Execution Services— Our Global Execution Services segment comprises agency-based trading and trading venues, offering execution services in global equities, options, futures and fixed income on behalf of institutions, banks and broker dealers. We earn commissions as an agent on behalf of clients as well as between principals to transactions; in addition, we will commit capital on behalf of clients as needed. Agency-based, execution-only trading in the segment is done primarily through a variety of access points including: (i) algorithmic trading and order routing in global equities and options; (ii) institutional sales traders executing program, block and riskless principal trades in global equities and ETFs; (iii) a fixed income ECN that also offers trading applications; and (iv) an ATS for U.S. equities.

In September 2016, we completed the acquisition of Neonet. Neonet is an independent agency broker and execution specialist based in Stockholm, Sweden. The results of Neonet, beginning on the date of acquisition, are included in this segment.

• Corporate and Other— Our Corporate and Other segment contains our investments, principally in strategic trading-related opportunities; manages the deployment of capital across the organization; houses executive management functions; and maintains corporate overhead expenses and all other income and expenses that are not attributable to our other segments. Our Corporate and Other segment also contains functions that support the Company’s other segments such as self-clearing services, including stock lending activities.

In March 2016, we completed the sale of assets related to our retail U.S. options market making business.

In May 2016, we completed the sale of our DMM business to Citadel.

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The results of the businesses and sales of the DMM and assets related to our retail U.S options market making business are included in the Market Making segment up through the dates of their respective sales.

See Footnote 3 "Assets of Business Held for Sale & Sales of Businesses" to the Company's Consolidated Financial Statements included in Part I, Item 1 "Financial Statements (Unaudited)" herein.

The following table sets forth: (i) Revenues, (ii) Expenses and (iii) Pre-tax earnings (loss) of our segments and on a consolidated basis (in thousands):

	For the three months ended March 31,
	2017			2016
Market Making
Revenues	$	174,656		$	258,918
Expenses	156,633			183,429
Pre-tax earnings	18,023			75,489
Global Execution Services
Revenues	70,756			76,394
Expenses	68,762			70,133
Pre-tax earnings	1,994			6,261
Corporate and Other
Revenues	9,961			10,112
Expenses	30,382			31,897
Pre-tax loss	(20,421		)	(21,785		)
Consolidated
Revenues	255,373			345,424
Expenses	255,777			285,459
Pre-tax (loss) earnings	$	(404	)	$	59,965

For additional details regarding our segments, see Footnote 20 “Business Segments” included in Part I, Item 1 "Financial Statements (Unaudited)" herein.

Consolidated revenues for the three months ended March 31, 2017 were $255.4 million, which represented a decrease of $90.1 million from $345.4 million in 2016. The $90.1 million decrease is primarily attributable to lower revenues from our Market Making segment, as a result of the decrease in the performance of our market making strategies, which were adversely impacted by lower volumes and market volatility, as compared to the first quarter of 2016. Global Execution Services revenues were adversely impacted by lower commissions from our agency execution and algorithmic trading services.

Consolidated pre-tax earnings for the three months ended March 31, 2017 was a loss of $0.4 million as compared to a gain of $60.0 million in 2016. Consolidated Pre-tax earnings decreased due to lower revenues offset, in part, by lower expenses.

The Company’s net revenues, which we define as total revenues, less execution and clearance fees, payments for order flow and collateralized financing interest, and which excludes certain revenue items such as those listed in the table below ("Net revenues”) were $148.9 million for the three months ended March 31, 2017, compared to $250.0 million for the comparable period in 2016. The decrease in net revenues is primarily attributable to the lower profitability of our market making strategies in 2017 as described above. Net revenues is a non-GAAP measure that we use to measure our performance as well as to make certain strategic decisions.

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The following tables provide a full reconciliation of total revenues to Net revenues for the three months ended March 31, 2017 and 2016 (in thousands):

	For the three months ended March 31,
	2017		2016
Reconciliation of Total revenues to Net revenues:
Total revenues per Consolidated Statements of Operations	$	255,373	$	345,424
Less:
Execution and clearance fees	72,795		73,634
Payments for order flow	17,121		12,655
Collateralized financing interest	11,761		9,163
Gain from the sale of the Company's remaining investment in Bats	4,834		—
Net revenues	$	148,862	$	249,972

The changes in our results by segment from the comparable period in 2016 are summarized as follows:

• Market Making— Our pre-tax earnings from Market Making for the three months ended March 31, 2017 was $18.0 million, compared to pre-tax earnings of $75.5 million for 2016. Results for 2017 were affected by the decline in the performance of our Market Making strategies, both domestically and internationally, which were impacted by lower volumes and volatility offset, in part, by lower expenses.

• Global Execution Services— Our pre-tax earnings from Global Execution Services for the three months ended March 31, 2017 was $2.0 million, compared to pre-tax earnings of $6.3 million for 2016. Results for 2017 reflected lower commissions from our agency execution and algorithmic trading services offset, in part, by improved results from our KCG Bondpoint business.

• Corporate and Other— Our pre-tax results from Corporate and Other was a pre-tax loss of $20.4 million for the three months ended March 31, 2017, compared to a pre-tax loss of $21.8 million for 2016. The results for 2017 included a $4.8 million gain from the sale of our remaining investment in Bats.

Headquarters relocation

In the second quarter of 2015, we adopted a plan to consolidate our metro New York City area real estate and relocate our corporate headquarters to lower Manhattan. As a result of this plan, we abandoned the majority of our Jersey City, NJ location on a staggered basis through the end of 2016 and abandoned our former New York, NY location at the end of 2016. Upon adopting the relocation plan, we prospectively shortened the remaining useful lives of the leasehold improvements and other fixed assets associated with these locations and recorded approximately $5.0 million per quarter of incremental depreciation and amortization beginning in the third quarter of 2015 through the end of 2016. In the fourth quarter of 2016 we successfully relocated our headquarters to 300 Vesey Street, New York, New York 10282.

We have also adopted a plan to relocate our main data center from Jersey City, NJ to other commercial data centers and colocations. We anticipate that this data center relocation will result in additional capital expenditures during 2017, which will lead to increases in depreciation, and we also expect this data center relocation to result in increases in our communications and data processing costs. We expect to complete our data center relocation in 2018.

Certain Factors Affecting Results of Operations

We may experience significant variation in our future results of operations. Fluctuations in our future performance may result from numerous factors, including, among other things, global financial market conditions and the resulting competitive, credit and counterparty risks; cyclicality, seasonality and other economic conditions; the value of our securities positions and other financial instruments and our ability to manage the risks attendant thereto; the volume, notional dollar value traded and volatility levels within the core markets where our market making and trade execution businesses operate; the composition, profile and scope of our relationships with institutional and broker dealer clients; the performance, size and volatility of our direct-to-client market making portfolios; the performance, size and volatility of our non-client exchange-based trading activities; the overall size of our balance sheet and capital usage; impairment of goodwill and/or tangible or intangible assets; the performance of our global operations, trading technology and technology infrastructure; the effectiveness of our self-clearing and futures platforms and our ability to manage risks related thereto; the availability and cost of credit and liquidity in the marketplace; our ability to prevent erroneous trade

45

orders from being submitted due to technology or other issues and avoiding the consequences thereof; the performance, operation and connectivity to various market centers; our ability to manage personnel, compensation, overhead, communications and data processing expenses including colocation costs, our occupancy expenses under our office leases and charges relating to legal and regulatory proceedings; the strength of our client relationships; changes in payments for order flow; changes to execution quality and changes in clearing, execution and regulatory transaction costs; interest rate movements; the addition or loss of executive management, sales, trading and technology professionals; geopolitical, legislative, legal, regulatory and financial reporting changes specific to financial services and global trading; legal or regulatory matters and proceedings, including matters and proceedings relating to the Merger or the Merger Agreement; the integration, performance and operation of previously acquired businesses; investor sentiment; the effectiveness of the measures we take to mitigate the risks of cyber threats; technological changes and events; the effect of the announcement or pendency of the proposed Merger on our business relationships, operating results, and business generally; disruptions to our current operations and potential employee retention difficulties resulting from the proposed Merger; the diversion of management’s attention from our ongoing business operations as a result of the Merger; and the costs, fees, expenses and other charges related to the proposed Merger.

Such factors may also have an impact on our ability to achieve our strategic objectives, including, without limitation, increases in market share, growth and profitability in the businesses in which we operate. If demand for our services declines or our performance deteriorates significantly due to any of the above factors, and we are unable to adjust our cost structure on a timely basis, our operating results could be materially and adversely affected. As a result of the foregoing factors, period-to-period comparisons of our revenues and operating results are not necessarily meaningful and such comparisons cannot be relied upon as indicators of future performance. There also can be no assurance that we will be able to continue to achieve the level of revenues that we have experienced in the past or that we will be able to improve our operating results.

Trends Affecting Our Company

We believe that our businesses are affected by various global economic trends as well as more specific trends. Some of the specific trends that impact our operations, financial condition and results of operations are:

• Clients continue to focus on statistics measuring the quality of their executions (including speed of execution and amount of price improvement). In an effort to improve the quality of their executions as well as increase efficiencies, market makers continue to increase the level of sophistication and automation within their operations and the extent of price improvement they provide to their clients. The continued focus on execution quality has resulted in greater price competition in the marketplace, which, along with market structure changes and market conditions, has negatively impacted the performance of our trading models and margin metrics and those of other market making firms.

• Market Making and Global Execution Services transaction volumes executed by clients have fluctuated over the past few years due to market conditions, retail and institutional investor sentiment and a variety of other factors. Market Making and Global Execution Services transaction volumes are not predictable and may not be sustainable.

• There continues to be growth in electronic trading, including direct market access platforms, algorithmic and program trading, high frequency trading, ECNs, ATSs and dark liquidity pools. In addition, electronic trading continues to expand to other asset classes, including options, currencies and fixed income. The expansion of electronic trading may result in the growth of innovative electronic products and competition for order flow and may further reduce demand for traditional institutional voice services.

• Over the past several years, exchanges have become far more competitive, and market participants have created ATSs, ECNs and other execution venues which compete with the OTC and listed trading venues. Initiatives by these and other market participants could draw market share away from the Company, and thus negatively impact our business. In addition, while there is the possibility for consolidation among trading venues, there are many new entrants into the market, including ATSs, Multilateral Trading Facilities, systematic internalizers, dark liquidity pools, high frequency trading firms and market making firms competing for retail and institutional order flow. Some of these new entrants are proposing features that may affect internalization practices and trading strategies of current market participants, and recently, some exchanges have introduced “speed bump” rules and other proposals designed to remove advantages of market participants that have invested in the low latency high speed technology. Further, many broker dealers offer

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their own internal crossing networks. These factors continue to create further fragmentation and competition in the marketplace.

• Market structure changes, competition, market conditions and a steady increase in electronic trading have resulted in a reduction in institutional commission rates and volumes which may continue in the future. Additionally, many institutional clients allocate commissions to broker dealers based not only on the quality of executions, but also in exchange for research or participation in soft dollar and commission recapture programs.

• Market structure changes, competition and technology advancements have led to an industry focus on increasing execution speeds and a dramatic increase in electronic message traffic. Increases in execution speeds and message traffic require additional expenditures for technology infrastructure and place heavy strains on the technology resources, bandwidth and capacities of market participants. Additionally, the expansion by market participants into trading of non-equities products offers similar challenges.

• There has been increased scrutiny of the capital markets industry by the regulatory and legislative authorities, both in the U.S. and abroad, which could result in increased regulatory costs in the future particularly as it relates to the trading of equities, fixed income, commodities, and currencies. As has been widely reported, there has been an increased focus by securities regulators, federal and state law enforcement agencies, Congress and the media on market structure issues, and, in particular, high frequency trading, best execution, ATS manner of operations, market fragmentation, public disclosures around order types and execution protocols, market structure complexity, colocation, access to market data feeds and remuneration arrangements such as payment for order flow and exchange fee structures. New legislation or new or modified regulations and rules could occur in the future. Members of the U.S. Congress continue to ask the SEC and other regulators to closely review the financial markets regulatory structure and make the changes necessary to insure the rule framework governing the U.S. financial markets is comprehensive and complete. The SEC and other regulators, both in the U.S. and abroad, have adopted and will continue to propose and adopt rules and take other policy actions where necessary, on a variety of marketplace issues – including, but not limited to: high frequency trading, market fragmentation and complexity, transaction taxes, off-exchange trading, dark liquidity pools, internalization, post-trade attribution, colocation, market access, short sales, consolidated audit trails, policies and procedures relating to technology controls and systems, optimal tick sizes, and market volatility rules. The SEC has recently enacted a pilot program for certain securities to increase the minimum trading increment and to include a “trade at” component, requiring that certain of these transactions occur only on an exchange, which could lead to increased costs for certain transactions.

• Unique instances of trading volatility impact our businesses. For example, on October 15, 2014, the market for U.S. Treasury securities, futures and other closely related financial markets experienced an unusually high level of volatility. Additionally, on August 24, 2015, the securities markets experienced an unusually high level of volatility that contributed to the delayed opening of securities on primary exchanges, sharp price moves in the major indices and in ETFs, and frequent triggering of trading halts. Market structure changes that may ensue as a result of these events and their effect on the Company are difficult to forecast.

• There could be continued fluctuations, including possible substantial increases, in Section 31 fees and fees imposed by other regulators. In addition, clearing corporations are considering various proposals which could require substantial increases in clearing margin, liquidity and collateral requirements, and financial transaction taxes have been introduced in certain jurisdictions and may be introduced in others.

• The Dodd-Frank Act affects nearly all financial institutions that operate in the U.S. While the weight of the Dodd-Frank Act falls more heavily on large, complex financial institutions, smaller institutions will continue to face a more complicated and expensive regulatory framework.

• The Fiduciary Rule, if implemented, could affect many financial institutions that operate in the U.S. Although the Fiduciary Rule would primarily affect institutions that provide investment advice to retirement plans and accounts, changes that such institutions may make in response to the Fiduciary Rule can have a broader effect.

• There has recently been an increased focus and increased sanction levels by regulators on broker-dealers’ controls and surveillance for Anti-Money Laundering and sanctions compliance by broker-dealers and similar entities, as well as an enhanced interest on suspicious activity reporting and transactions involving microcap securities.

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Income Statement Items

The following section briefly describes the key components and drivers of our significant revenues and expenses.

Revenues

Our revenues consist principally of Trading revenues, net and Commissions and fees from all of our business segments.

Trading profits and losses on principal transactions primarily relate to our global market making activities and are included within Trading revenues, net. These revenues are primarily affected by trading volumes, including the number and dollar value of equities, fixed income, options, futures and FX trades; volatility in the marketplace; the performance of our direct-to-client and non-client trading models; our ability to derive trading gains by taking proprietary positions; changes in our execution standards and execution quality that we provide to customers; our market share; the mix of order flow from broker dealer and institutional clients; client service and relationships; and regulatory changes and evolving industry customs and practices.

Revenues on transactions for which we charge explicit commissions or commission equivalents, which include the majority of our institutional client orders, are included within Commissions and fees. Also included in Commissions and fees are volume based fees earned from providing liquidity to other trading venues. Commissions and fees are primarily affected by changes in our equity, fixed income and futures transaction volumes with institutional clients; client relationships; changes in commission rates; client experience on the various platforms; level of volume based fees from providing liquidity to other trading venues; and the level of our soft dollar and commission recapture activity.

Interest, net is earned from our cash held at banks, cash held in trading accounts at third party clearing brokers and from collateralized financing arrangements, such as securities borrowing. The Company’s third party clearing agreements call for payment or receipt of interest income, net of transaction-related interest charged by such clearing brokers for facilitating the settlement and financing of securities transactions. Net interest is primarily affected by interest rates; the level of cash balances held at banks and third party clearing brokers; our level of securities positions in which we are long compared to our securities positions in which we are short; and the extent of our securities borrowing and collateralized financing activity.

Investment income and other, net primarily represents returns on our investments as well as gains on the sales of our businesses and repurchases of our debt. Such income or loss is primarily affected by the performance and activity of our strategic investments and the effect of gains on the sale of businesses. Also included in Investment income and other, net are foreign exchange transaction gains or losses, which are dependent on our level of activities and balances denominated in foreign currencies and the fluctuations of the exchange rate of the U.S. dollar against foreign currencies.

Expenses

Execution and clearance fees primarily represent fees paid to third party clearing brokers for clearing equities, options and fixed income transactions; transaction fees paid to Nasdaq and other exchanges, clearing organizations and regulatory bodies; and fees paid to third parties, primarily for executing, processing and settling trades on the NYSE, other exchanges, ECNs and other third party execution destinations. Execution and clearance fees primarily fluctuate based on changes in trade and share volume, execution strategies, rate of clearance fees charged by clearing brokers and rate of fees paid to ECNs, exchanges, other third party execution destinations and certain regulatory bodies.

Employee compensation and benefits expense primarily consists of salaries and wages paid to all employees; performance-based compensation, which includes compensation paid to certain sales personnel and certain incentive compensation paid to employees based on individual performance and the performance of our business; employee benefits; and stock, unit-based and other deferred compensation. Employee compensation and benefits expense fluctuates, for the most part, based on Net revenues, profitability, changes in our business mix and the number and mix of employees.

Communications and data processing expense primarily consists of costs for obtaining market data, connectivity, telecommunications services, colocation facilities and systems maintenance.

Depreciation and amortization expense results from the depreciation of fixed assets, which consist of computer hardware, equipment and furniture and fixtures, and the amortization of purchased software, capitalized internal software development costs, acquired intangible assets and leasehold improvements. We depreciate our fixed assets

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and amortize our intangible assets on a straight-line basis over their expected useful lives. We amortize leasehold improvements on a straight-line basis over the lesser of the life of the improvement or the remaining term of the lease.

Payments for order flow primarily represent payments to broker dealer clients, in the normal course of business, for directing to us their order flow primarily in U.S. equities. Payments for order flow will fluctuate as we modify our rates and as our percentage of clients whose policy is not to accept payments for order flow varies. Payments for order flow also fluctuate based on U.S. equity share and option volumes, our profitability and the mix of market orders, limit orders, and customer mix.

Collateralized financing interest consists primarily of costs associated with financing arrangements such as securities lending and sale of financial instruments under our agreements to repurchase.

Debt interest expense consists primarily of costs associated with our debt including amortization of debt issuance costs and capital lease obligations.

Occupancy and equipment rentals consist primarily of rent, utilities and other operating expenses related to leased premises and office equipment.

Professional fees consist primarily of legal, accounting, consulting, and other professional fees.

Business development consists primarily of costs related to sales and marketing, conferences and client relationship management.

Other expenses include regulatory fees, corporate insurance, employment fees and general office expense.

Three months ended March 31, 2017 and 2016

Revenues

Market Making

	For the three months ended March 31,
	2017			2016		Change			% of Change
Trading revenues, net (thousands)	$	146,875		$	218,653	$	(71,778	)	(32.8	)%
Commissions and fees (thousands)	29,514			38,009		(8,495		)	(22.3	)%
Interest, net and other (thousands)	(1,733		)	2,256		(3,989		)	N/M
Total revenues from Market Making (thousands)	$	174,656		$	258,918	(84,262		)	(32.5	)%
U.S. equity Market Making statistics:
Average daily dollar volume traded ($ millions)	27,404			30,888		(3,484		)	(11.3	)%
Average daily trades (thousands)	3,411			4,236		(825		)	(19.5	)%
Average daily NYSE and Nasdaq shares traded (millions)	986			1,109		(123		)	(11.1	)%
Average daily OTC Bulletin Board and OTC Market shares traded (millions)	9,096			3,707		5,389			145.4	%
Average revenue capture per U.S. equity dollar value traded (bps)	0.94			1.13		(0.19		)	(16.8	)%

Totals may not add due to rounding.

N/M - Not meaningful

Global Execution Services

	For the three months ended March 31,
	2017			2016			Change			% of Change
Commissions and fees (thousands)	$	64,075		$	68,090		$	(4,015	)	(5.9	)%
Trading revenues, net (thousands)	7,312			9,338			(2,026		)	(21.7	)%
Interest, net and other (thousands)	(631		)	(1,034		)	403			N/M
Total revenues from Global Execution Services (thousands)	$	70,756		$	76,394		(5,638		)	(7.4	)%
Average daily KCG Institutional Equities U.S. equities shares traded (millions)	215.1			271.8			(56.7		)	(20.9	)%
Average daily KCG BondPoint fixed income par value traded ($ millions)	266.5			192.4			74.1			38.5	%

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Totals may not add due to rounding.

N/M - Not meaningful

Corporate and Other

	For the three months ended March 31,
	2017		2016		Change			% of Change
Total revenues from Corporate and Other (thousands)	$	9,961	$	10,112	$	(151	)	(1.5	)%

Trading revenues, net were $154.3 million in the three months ended March 31, 2017, down 31.1% from $223.9 million for the comparable period in 2016. Trading revenues, net are primarily driven by the performance of our direct-to-client and non-client based strategies within our Market Making segment. The majority of these revenues are derived from our market making strategies in U.S. equities whose performances declined in 2017. Additionally, there was a decrease in revenues derived from non U.S. equity market making strategies which include fixed income, currencies and commodities as well as strategies in Europe and Asia. The decline in performance is primarily due to less favorable market conditions in 2017 including substantially lower market volumes, a tightening of spreads for equities traded, improved client execution quality and lower volatility.

We calculate average revenue capture per U.S. equity market making dollar value traded (“revenue capture”) to measure the revenue that we earn per dollar traded within U.S. equity market making. Revenue capture is a calculated metric that helps summarize the performance of our U.S. equity market making strategies and is impacted in a similar manner to the components that make it up, including market volumes and volatility and the performance of our U.S. equity trading strategies. The revenue capture metric is calculated as the total of net domestic market making trading revenues plus volume based fees from providing liquidity to other trading venues (which are included in Commissions and fees), (collectively “U.S. Equity Market Making Revenues”), divided by the total dollar value of the related equity transactions for the relevant period.

Average revenue capture per U.S. equity dollar traded was 0.94 basis points ("bps") in the three months ended March 31, 2017, down 16.8% from 1.13 bps for the comparable period in 2016. U.S. Equity Market Making Revenues were $159.6 million and $212.7 million for the three months ended March 31, 2017 and 2016, respectively.

Commissions and fees decreased 11.8% to $93.6 million in the three months ended March 31, 2017, compared to $106.1 million for the comparable period in 2016. The decrease was primarily driven by the decrease in volumes that generate commissions from providing liquidity to other trading venues as well as decreases in U.S. agency-based commissions for both high touch and algorithmic services. These decreases were partially offset by the growth of KCG Bondpoint and EU algorithmic sales (due to the acquisition of Neonet).

Interest income, net increased to $0.8 million in the three months ended March 31, 2017, compared to $0.1 million for the comparable period in 2016. Our interest income varies based on the amount of cash held at banks and level of our balances held at our third party clearing brokers, stock borrow activity, and interest rates.

Investment income and other, net was $6.7 million in the three months ended March 31, 2017, compared to $15.3 million for the comparable period in 2016. Income for the three months ended March 31, 2017 includes a $4.8 million gain from the sale of our remaining investment in Bats. Income for the three months ended March 31, 2016 includes a $2.9 million gain from the sale of assets related to our retail U.S. options market making operations, a $3.7 million gain from the repurchase of a portion of our 6.875% Senior Secured Notes and a $2.8 million net gain primarily resulting from a distribution from an investment.

Expenses

Employee compensation and benefits expense fluctuates, for the most part, based on Net revenues, profitability, changes in our business mix and the number and mix of employees. Employee compensation and benefits expense was $66.0 million in the three months ended March 31, 2017 and $97.6 million for the comparable period in 2016. For the three months ended March 31, 2017, employee compensation and benefits was 44.3% of Net revenues compared to 39.0% for the three months ended March 31, 2016. The decrease on a dollar basis was primarily due to lower discretionary compensation accruals as a result of lower Net revenues and decreased profitability as well as fewer employees.Lower Net revenues and profitability were factors in the increase in compensation as a percentage of Net Revenues.

The number of full time employees decreased to 923 at March 31, 2017 from 972 at March 31, 2016. The decrease

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was due to natural attrition and the sale of our DMM business in the second quarter of 2016 offset, in part, by the effect of the acquisition of Neonet in September of 2016 and other new hires.

Execution and clearance fees were $72.8 million for the three months ended March 31, 2017 and $73.6 million for the three months ended March 31, 2016. As a percentage of total revenues, Execution and clearance fees were 28.5% for the three months ended March 31, 2017 and 21.3% for 2016. The decrease in Execution and clearance fees on a dollar basis was due to a decrease in volumes primarily in relation to U.S. equity market making offset by higher ECN usage fees. The increase as a percentage of revenues was due to decrease in performance of our trading models as well as Q1 2016 gains on the sale of our retail U.S. options market making operations, the gains on the repurchase of our debt and a distribution from an investment. Execution and clearance fees fluctuate based on changes in transaction volumes, shift in business mix, regulatory fees and operational efficiencies and scale.

Communications and data processing expenses were $39.0 million for the three months ended March 31, 2017 and $35.7 million for 2016. The increase in communications and data processing expense primarily relates to higher high speed network fees and colocation expenses offset, in part, by slightly lower market data costs.

Depreciation and amortization expense results from the depreciation of fixed assets and the amortization of purchased software, capitalized internal use software development costs, acquired intangible assets and leasehold improvements. Depreciation and amortization expense was $19.0 million for the three months ended March 31, 2017 and $21.9 million for 2016. The decrease is due to the full depreciation of leaseholds and other fixed assets located at our former Jersey City and New York City locations, which were vacated in the fourth quarter of 2016 and thus had no attributable amortization or depreciation in 2017. The decreases were offset, in part, by additional depreciation as a result of our move, specifically for leaseholds and other fixed assets at our new headquarters as well as other capital expenditures and increased capitalized internal-use software. See "Headquarters relocation" earlier in this section for further information regarding depreciation.

Payments for order flow fluctuate in total and as a percentage of revenue due to changes in volume, client and product mix, client preference, profitability, and competition. Payments for order flow were $17.1 million for the three months ended March 31, 2017 and $12.7 million for 2016. As a percentage of revenues, Payments for order flow were 6.7% for 2017 and 3.7% in 2016. The increase on a dollar basis and as a percentage of revenues is due to greater payments for order flow related to our U.S. equity market making business, primarily as a result of client preference and mix.

Collateralized financing interest expense was $11.8 million for the three months ended March 31, 2017 and $9.2 million for 2016. Collateralized financing interest expense relates to the funding of our securities positions primarily through stock loan and repurchase agreements. The increase is a result of additional funding in 2017 as well as an increase in funding rates.

Debt interest expense was $9.3 million for the three months ended March 31, 2017 and $9.5 million for 2016. The decrease is due to reduced debt outstanding as a result of the repurchase of $35.0 million par value of our 6.875% Senior Secured Notes in the open market during the first quarter of 2016.

Occupancy and equipment rentals expense was $6.8 million for the three months ended March 31, 2017 and $9.0 million for 2016. The decrease is primarily due to lower rent expense due to a decrease in leased space, primarily related to our move to our new headquarters in New York. See "Headquarters relocation" earlier in this section for further information.

Professional fees were $4.5 million for the three months ended March 31, 2017 and $6.1 million for 2016. The decrease in Professional fees was primarily due to lower legal fees in 2017 offset, in part, by higher consulting fees.

All other expenses were $9.4 million for the three months ended March 31, 2017 and $10.3 million for 2016. The decrease primarily relates to a decrease in registration fees and insurance costs offset, in part, by higher recruiting and temporary help costs in 2017.

Our effective tax rate of a benefit of 894% for the three months ended March 31, 2017 differs from the federal statutory rate of 35% primarily due to the recognition of $3.5 million of excess tax benefits for stock-based compensation awards that vested in the quarter, offset, in part, by state and local taxes and the effect of nondeductible expenses including certain compensation and meals and entertainment. Our effective tax rate of 38.0% for the three months ending March 31, 2016 differed from the federal statutory rate of 35% primarily due to state and local taxes and the effect of nondeductible expenses including certain compensation and meals and entertainment.

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Financial Condition, Liquidity and Capital Resources

Financial Condition

We have maintained a highly liquid balance sheet, with a substantial portion of our total assets consisting of cash, highly liquid marketable securities and short term receivables. As of March 31, 2017 and December 31, 2016, we had total assets of $5.98 billion and $6.26 billion, respectively, a significant portion of which consisted of cash or assets readily convertible into cash as follows (in thousands):

	March 31, 2017		December 31, 2016
Cash and cash equivalents	$	669,869	$	632,234
Financial instruments owned, at fair value:
Equities	2,179,211		2,343,033
Debt Securities	128,932		177,698
Listed Options	12,299		19,100
Collateralized agreements:
Securities borrowed	1,594,442		1,688,222
Receivable from brokers, dealers and clearing organizations (1)	589,279		641,257
Total cash and assets readily convertible to cash	$	5,174,032	$	5,501,544

⁽¹⁾ Excludes $212.4 million and $191.5 million of securities failed to deliver as of March 31, 2017 and December 31, 2016, respectively.

Totals may not add due to rounding.

Substantially all of the non-cash amounts disclosed in the table above can be liquidated into cash within five business days under normal market conditions, however, the liquidated values may be subjected to haircuts during distressed market conditions.

Cash and cash equivalents increased from December 31, 2016 due to cash generated by our operating activities as well as the sale of the remaining portion of our investment in Bats offset, in part, by payments of 2016 year-end cash bonuses in 2017, capital expenditures and estimated income tax payments.

Financial instruments owned principally consist of equities that trade on the NYSE, NYSE Amex and NYSE Arca markets, Nasdaq and unlisted securities that trade over-the-counter and through marketplaces operated by the OTC Markets Group Inc. as well as U.S. government and non-U.S. government obligations and corporate debt securities, which include short-term bond funds. These financial instruments are used to generate revenues in our Market Making and Global Execution Services segments.

Securities borrowed represent the value of cash or other collateral deposited with securities lenders to facilitate our trade settlement process.

Receivable from brokers, dealers and clearing organizations include interest bearing cash balances held with third party clearing brokers, including, or net of, amounts related to securities transactions that have not yet reached their contracted settlement date, which is generally within three business days of the trade date.

As of March 31, 2017, $1.57 billion of securities, primarily equities, have been pledged as collateral to third-parties under financing arrangements. As of December 31, 2016, $1.61 billion of securities, primarily equities, were pledged as collateral to third-parties under financing arrangements.

Goodwill and intangible assets, net of accumulated amortization were higher at March 31, 2017 compared to December 31, 2016 primarily due to the reclassification of intangible assets related to a technology platform, from held for sale to intangible assets (See Footnote 9 "Goodwill and Intangibles Assets" included in Part I, Item 1 "Financial Statements (Unaudited)" of this Form 10-Q for further information) as well as additional capitalized internal-use software offset, in part, by amortization of intangible assets.

Other assets primarily comprise deposits, prepaids and other miscellaneous receivables. Other assets increased primarily as a result of an increase in customer receivable balances offset, in part, by the collection of a portion of our receivable from Bats related to our sale of KCG Hotspot. See Footnote 3 "Assets and Liabilities Held for Sale & Sales of Businesses" to the Company's Consolidated Financial Statements included in Part I, Item 1 "Financial Statements (Unaudited)" of this Form 10-Q for further information on the Bats receivable.

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The change in the balances of Financial instruments owned, Receivable from brokers, dealers and clearing organizations and Securities borrowed are all consistent with activity of our trading strategies. Our securities inventory fluctuates based on trading volumes, market conditions, trading strategies utilized and our pre-determined risk limits.

Total liabilities were $4.64 billion at March 31, 2017 and $4.90 billion at December 31, 2016. Similar to the asset side, the change in Financial instruments sold, not yet purchased, Collateralized financings and Payable to brokers, dealers and clearing organizations is related to the activity of our trading strategies. The decrease in our Accrued compensation expense is primarily due to the payment of 2016 cash bonuses paid in 2017 as well as a lower accrual for discretionary bonus accruals for Q1 2017 as compared to the full year of 2016.

Equity decreased from $1.36 billion at December 31, 2016 to $1.35 billion at March 31, 2017. The $10.0 million decrease in equity from December 31, 2016 was primarily a result of our stock repurchase activities in 2017 offset, in part, by Net Income in Q1 2017.

Liquidity and Capital Resources

We have financed our business primarily through cash generated by operations, sales of businesses and investments, a series of debt transactions and the issuance of equity.

At March 31, 2017, we had net current assets, which consist of net assets readily convertible into cash including assets segregated or held in separate accounts under federal and other regulations, less current liabilities, of approximately $1.00 billion.

Our cash flow activities were as follows (in thousands):

	For the three months ended March 31,
	2017			2016
Net cash provided by (used in):
Operating activities	$	73,345		$	132,329
Investing activities	(26,474		)	(4,404		)
Financing activities	(10,241		)	(62,429		)

Operating activities

For the three months ended March 31, 2017, cash of $73.3 million was provided by operating activities as compared to cash of $132.3 million for the three months ended March 31, 2016. Increases in operating liabilities generally result in an increase in cash provided, while increases in operating assets generally result in the utilization of cash. The current period decrease is primarily related to a decrease in Net income, the effects of changes in inventory and related collateralized agreements and collateralized financings as well as in non-cash addbacks such as depreciation and amortization and stock based compensation.

Investing activities

For the three months ended March 31, 2017, cash of $26.5 million was used in investing activities as compared to cash of $4.4 million used in investing activities in the comparable period in 2016.

For the three months ended March 31, 2017, we received cash of $13.9 million from the sale of assets.

Capital expenditures, including capitalized software development costs, were $39.5 million and $21.7 million for the three months ended March 31, 2017 and 2016, respectively. The increased expenditure is primarily due to the build out of our new colocations.

Financing activities

For the three months ended March 31, 2017, cash of $10.2 million was used in financing activities as compared to $62.4 million cash used in the comparable period in 2016. The primary uses of cash for financing activities in the three months ended March 31, 2017 related to the repurchase of KCG Class A Common Stock. The primary uses of cash for financing activities in the 2016 period related to $30.7 million for repurchases of KCG Class A Common Stock and $30.3 million for the repurchase of a portion of our 6.875% Senior Secured Notes.

See Footnote 10 “Debt” included in Part I, Item 1 “Financial Statements (Unaudited)” of this Form 10-Q for a description of our debt as of March 31, 2017.

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Stock and Warrant Repurchases

We may repurchase shares of KCG Class A Common Stock or Warrants from time to time in open market transactions, accelerated stock buyback programs, tender offers, privately negotiated transactions or by other means. Repurchases may also be made under Rule 10b5-1 plans. The timing and amount of repurchase transactions will be determined by our management based on its evaluation of market conditions, share price, legal requirements and other factors. The program may be suspended, modified or discontinued at any time without prior notice. We caution that there are no assurances that any further repurchases will actually occur. All KCG Class A Common Stock and Warrant repurchases are subject to the restrictive covenants in the 6.875% Senior Secured Notes Indenture. In addition, pursuant to the Merger Agreement, we are unable to purchase shares of KCG Class A Common Stock or Warrants-other than pursuant to existing restricted stock purchase agreements with current or former employees or in connection with the acceptance of KCG Class A Common Stock for purposes of paying the exercise price of outstanding stock options or tax withholding-without the prior written consent of Virtu (such consent not to be unreasonably withheld).

During the first quarter of 2017, our Board of Directors authorized a share repurchase program to repurchase up to a total of $150.0 million in shares of our Class A Common Stock and Warrants. This new program supersedes all prior repurchase authority.

During the fourth quarter of 2016, KCG entered into an agreement with General Atlantic, its largest shareholder at that time. Under the terms of the agreement, KCG sold 8.9 million shares it owned of Bats common stock in exchange for all of General Atlantic's 18.7 million shares of KCG Class A Common Stock and 8.1 million Warrants.

See Footnote 15 "Warrants and Stock Repurchase" and Footnote 11 "Related Parties" included in Part I, Item 1 “Financial Statements (Unaudited)” of this Form 10-Q for further information.

The Company repurchased 1.1 million Warrants for $2.9 million in the first quarter of 2017.

As of March 31, 2017 we had 66.7 million shares of KCG Class A Common Stock outstanding including RSUs as compared to 67.2 million shares at December 31, 2016.

Repurchases of debt

In the first quarter of 2016, we repurchased $35.0 million par value of 6.875% Senior Secured Notes in the open market for $31.2 million (including interest owed). The Company recorded a $3.7 million pre-tax gain within Investment income and other, net on the Consolidated Statements of Operations as a result of these repurchases. The gain on repurchases was net of accelerated original issue discount of $0.3 million and accelerated capitalized issuance costs of $0.7 million.

Regulatory requirements

KCG Americas LLC ("KCGA"), our U.S. registered broker dealer, is subject to regulatory requirements intended to ensure the general financial soundness and liquidity of broker dealers and require the maintenance of minimum levels of net capital, as defined in SEC Rule 15c3-1 as well as other capital requirements from several commodity organizations including the Commodity Futures Trading Commission ("CFTC") and the National Futures Association. These regulations also prohibit a broker dealer from repaying subordinated borrowings, paying cash dividends, making loans to its parent, affiliates or employees, or otherwise entering into transactions which would result in a reduction of its total net capital to less than 120% of its required minimum capital. Moreover, broker dealers are required to notify the SEC, CFTC and other regulators prior to repaying subordinated borrowings, paying dividends and making loans to its parent, affiliates or employees, or otherwise entering into transactions, which, if executed, would result in a reduction of 30% or more of its excess net capital (net capital less minimum requirement). The SEC and the CFTC have the ability to prohibit or restrict such transactions if the result is detrimental to the financial integrity of the broker dealer. As of March 31, 2017, KCGA was in compliance with the applicable regulatory net capital rules.

The following table sets forth the net capital level and requirements for KCGA at March 31, 2017, as reported in its regulatory filing (in thousands):

	Net Capital		Net Capital Requirement		Excess Net Capital
KCG Americas LLC	$	376,782	$	1,611	$	375,171

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Our U.K. registered broker dealer is subject to certain financial resource requirements of the Financial Conduct Authority ("FCA"). The following table sets forth the financial resource requirement for KCG Europe Limited, our U.K. registered broker dealer, at March 31, 2017 (in thousands):

	Financial Resources		Resource Requirement		Excess Financial Resources
KCG Europe Limited	$	141,132	$	114,970	$	26,162

Our other U.K. registered broker dealer, GETCO Europe Limited withdrew from its membership with the FCA during the first quarter of 2015. All business of GETCO Europe Limited had previously been transferred to KCG Europe Limited.

Off-Balance Sheet Arrangements

As of March 31, 2017, we did not have any off-balance sheet arrangements, as defined in Item 303(a)(4)(ii) of SEC Regulation S-K.

Effects of Inflation

The majority of our assets are liquid in nature and therefore are not significantly affected by inflation. However, the rate of inflation may affect our expenses, such as employee compensation, office leasing costs and communications expenses, which may not be readily recoverable in the prices of the services offered by us. To the extent inflation results in rising interest rates and has other adverse effects on the securities markets, it may adversely affect our financial position and results of operations.

Subsequent Events

See Footnote 1 "Organization and Description of Business" and Footnote 21 “Subsequent Events” included in Part I, Item 1 “Financial Statements (Unaudited)” of this Form 10-Q for further discussion of subsequent events.

Critical Accounting Policies

The preparation of our Consolidated Financial Statements and the accompanying notes requires management to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses.

There have been no updates to our critical accounting policies from those disclosed in “Management’s Discussion and Analysis of Financial Condition” in our Annual Report on Form 10-K for the year ended December 31, 2016.

See Footnote 2 "Significant Accounting Policies" included in Part I, Item 1 "Financial Statements (Unaudited)" of this Form 10-Q for a further discussion of our accounting policies.

Accounting Standards Updates

See Footnote 2 “Significant Accounting Policies” included in Part I, Item 1 “Financial Statements (Unaudited)” of this Form 10-Q for further discussion of accounting guidance recently adopted and accounting guidance to be adopted in future periods.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

We are exposed to numerous risks in the ordinary course of our business and activities; therefore, effective risk management is critical to our financial soundness and profitability. We have a comprehensive global risk management structure and processes to monitor and evaluate the principal risks we assume in conducting our business. Our risk management policies, procedures and methodologies are subject to ongoing review and modification. The principal risks we face are as follows:

Market Risk

Our market making and trading activities expose our capital to significant risks. These risks include, but are not limited to, absolute and relative price movements, price volatility, interest rates, foreign exchange rates, credit spreads and changes in liquidity. Price risks result from exposure to changes in prices of individual financial instruments, baskets and indices. Further risks may result from changes in the factors determining options prices. Interest rate risks result primarily from exposure to and changes in the yield curve, the volatility of interest rates and credit spreads. As market makers we are also exposed to “open order” risk where during unusual market conditions we could have an abnormally

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high percentage of our open orders filled simultaneously and therefore acquire a larger than average position in securities or derivative instruments.

For working capital purposes, we invest in money market funds and maintain interest and non-interest bearing balances at banks and in our trading accounts with clearing brokers, which are classified as Cash and cash equivalents and Receivable from brokers, dealers and clearing organizations, respectively, on the Consolidated Statements of Financial Condition. These financial instruments do not have maturity dates; the balances are short term, which helps to mitigate our market risks. We also invest our working capital in short-term U.S. government securities, which are included in Financial instruments owned on the Consolidated Statements of Financial Condition. Our cash and cash equivalents held in foreign currencies are subject to the exposure of foreign currency fluctuations. These balances are monitored daily and are hedged or reduced when appropriate and therefore not material to our overall cash position.

We employ proprietary position management and trading systems that provide real-time, on-line risk exposure calculations, position management and inventory control. We monitor our risks by reviewing trading positions and their appropriate risk measures. We have established a system whereby transactions are monitored by senior management and an independent risk control function on a real-time basis as are aggregate risk exposures, sub unit risk exposures and aggregate dollar and inventory position totals, capital allocations, and real-time profits and losses. Our management of trading positions is enhanced by our review of mark-to-market valuations and position summaries on a daily basis.

In the normal course of business, we maintain inventories of exchange-listed and other equity securities, and to a lesser extent, fixed income securities and listed equity options. The fair value of these financial instruments at March 31, 2017 and December 31, 2016 was $2.32 billionand $2.54 billion, respectively, in long positions and $1.91 billion and $2.05 billion, respectively, in short positions. We also enter into futures contracts, which are recorded on our Consolidated Statements of Financial Condition within Receivable from brokers, dealers and clearing organizations or Payable to brokers, dealers and clearing organizations as applicable.

We calculate daily the potential losses that might arise from a series of different stress events. These include both single factor and multi factor shocks to asset prices based off both historical events and hypothetical scenarios. The stress calculations include a full recalculation of any option positions, non-linear positions and leverage. Senior management and the independent risk function carefully monitor the highest stress scenarios to ensure that the Company is not unduly exposed to any extreme events.

The potential change in fair value is estimated to be a gain of $18.9 million using a hypothetical 10% increase in equity prices as of March 31, 2017, and an estimated loss of $11.1 million using a hypothetical 10% decrease in equity prices at March 31, 2017. These estimates take into account the offsetting effect of such hypothetical price movements on the fair value of short positions against long positions, the effect on the fair value of options, futures, nonlinear positions and leverage as well as assumed correlations with non-equity asset classes, such as fixed income, commodities and foreign exchange. The Company relies on internally developed systems in order to model and calculate stress risks to a variety of different scenarios.

Operational Risk

Operational risk can arise from many factors ranging from routine processing errors to potentially costly incidents arising, for example, from major systems failures or human errors. We maintain a robust framework to manage operational risk events. The framework includes a sound risk management governance structure, including a Chief Risk Officer, a risk function, Management Risk Committee, and a Board Risk Committee. Within the risk function, we have created a formal Operational Risk Management team lead by the Global Head of Operational Risk, responsible for managing the Company’s operational risk exposure. The Emergency Response Center has been established and is tasked with monitoring and responding to operational incidents and natural disasters in real time. The Emergency Management Plan ("EMP") sets forth procedures for firm-wide crisis response, should incidents go beyond the emergency solving capabilities of individual businesses. The EMP is tested several times a year with simulated emergencies of various kinds. Furthermore, the framework incorporates market access controls designed to closely monitor inbound and outbound orders and enable the rapid automatic shut-down for specific applications.

Our businesses are highly dependent on our ability and our market centers' ability to process, on a daily basis, a large number of transactions across numerous and diverse markets in several currencies and products. We incur operational risk across all of our business activities, including revenue generating activities as well as support functions. Legal and compliance risk is included in the scope of operational risk and is discussed below under “Legal Risk.”

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We rely heavily on technology and automation to perform many functions within KCG, which exposes us to various forms of cyber-attacks, including data loss or destruction, unauthorized access, unavailability of service or the introduction of malicious code. We have taken significant steps to mitigate the various cyber threats, and we devote significant resources to maintain and regularly upgrade our systems and networks and review the ever changing threat landscape. We have created a dedicated Information Security Group, created and filled the role of Information Security Officer and formed an Information Security Steering Committee. In addition, we have enhanced the communication channels with government and law enforcement agencies for better information sharing and awareness. We will continue to periodically review policies and procedures to ensure they are effective in mitigating current cyber and other information security threats. In addition to the policy reviews, we continue to look to implement technology solutions that enhance preventive and detection capabilities. We also maintain insurance coverage that may, subject to policy terms and conditions, cover certain aspects of cyber risks. However, such insurance may be insufficient to cover all losses.

Primary responsibility for the management of operational risk lies with our operating segments and supporting functions, and secondary responsibility lies with the Operational Risk Management function. Our operating segments maintain controls designed to manage and mitigate operational risk for existing activities. As new products and business activities are developed or new third parties are being on boarded, we endeavor to identify operational risks and design controls to seek to mitigate the identified risks.

Disaster recovery plans are in place for critical facilities related to our primary operations and resources, and redundancies are built into the systems as deemed reasonably appropriate. We have also established policies, procedures and technologies designed to seek to protect our systems and other assets from unauthorized access. There is no assurance that such plans, policies, procedures and technologies will prevent a significant disruption to our business.

Liquidity Risk

Liquidity risk is the risk that we would be unable to meet our financial obligations as they arise in both normal and strained funding environments. To that end, we have established a comprehensive and conservative set of policies and procedures that govern the management of liquidity risk for the Company at the corporate level and at the subsidiary entity level.

We maintain a liquidity pool consisting of primarily cash and other highly liquid instruments at the holding company level to satisfy intraday and day-to-day funding needs, as well as potential cash needs in a strained funding environment.

Secured funding for the majority of our inventory is done through our regulated U.S. broker dealer subsidiary, KCGA. As such, a significant portion of our liquidity risk lies within KCGA. We consider cash and other highly liquid instruments held within KCGA, up to $150.0 million, a part of our liquidity pool to support financial obligations in normal and strained funding environments. We target having $350.0 million in our liquidity pool of cash and highly liquid instruments held at the holding company level and KCGA.

Cash and other highly liquid investments held by all other subsidiary entities are available to support financial obligations within those entities.

Our liquidity pool comprises the following (in thousands):

	March 31, 2017		December 31, 2016
Liquidity Pool Composition
Holding company
Cash held at banks	$	10,793	$	3,674
Money market and other highly liquid investments	326,531		366,208
KCGA
Cash held at banks	36,955		28,891
Money market and other highly liquid investments	113,045		121,109
Total Liquidity Pool	$	487,323	$	519,882
Cash and other highly liquid investments held by other subsidiary entities	$	75,186	$	78,205

In addition, we maintain committed and uncommitted credit facilities with a number of unaffiliated financial institutions. In connection with the uncommitted credit facilities, the lenders are at no time under any obligation to make

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any advances under the credit facilities, and any outstanding loans must be repaid on demand. See Footnote 10 "Debt" included in Part I, Item 1 “Financial Statements (Unaudited)” of this Form 10-Q for additional information regarding our credit facilities.

We regularly perform liquidity risk stress testing based on a scenario that considers both market-wide stresses and a company-specific stress over a one-month period. Given the nature of the Company’s business activity and balance sheet composition, survival over the first one to three days of a severe stress environment is most critical, after which management actions could be effectively implemented to navigate through prolonged periods of financial stress. The modeled cash inflows and outflows from the stress test serve as a quantitative input to assist us in establishing the Company’s liquidity risk appetite and amount of liquid assets to be held at the corporate level. The liquidity stress test considers cash flow risks arising from, but not limited to, a dislocation of the secured funding market, additional unexpected margin requirements, and operational events.

We maintain a contingency funding plan which clearly delineates the roles, responsibilities and actions that will be utilized as the Company encounters various levels of liquidity stress with the goal of fulfilling all financial obligations as they arise while maintaining business activity.

Capital Risk

Government regulators, both in the U.S. and globally, as well as self-regulated organizations, have supervisory responsibility over our regulated activities and require us to maintain specified minimum levels of regulatory capital in our broker dealer subsidiaries. If not properly monitored, our regulatory capital levels could fall below the required minimum amounts set by our regulators, which could expose us to various sanctions ranging from fines and censure to imposing partial or complete restrictions on our ability to conduct business.

To mitigate this risk, we continuously evaluate the levels of regulatory capital at each of our regulated subsidiaries and adjust the amounts of regulatory capital as necessary to ensure compliance with regulatory capital requirements. We also maintain excess regulatory capital to accommodate periods of unusual or unforeseen market volatility. In addition, we monitor regulatory developments regarding capital requirements and prepare for changes in the required minimum levels of regulatory capital that may occur in the future.

Legal Risk

Legal risk includes the risk of non-compliance with applicable legal and regulatory requirements and standards. Legal risk also includes contractual and commercial risk such as the risk that counterparty’s performance obligations will be unenforceable. We are generally subject to extensive regulation in the different jurisdictions in which we conduct our business. We have established procedures based on legal and regulatory requirements that are designed to foster compliance with applicable statutory and regulatory requirements. We have also established procedures that are designed to require that our policies relating to conduct, ethics and business practices are followed.

Credit Risk

Credit risk represents the loss that we would incur if a counterparty fails to perform its contractual obligations in a timely manner. We manage credit risk with a global, independent risk management function that is responsible for measuring, monitoring and controlling the counterparty credit risks inherent in our business activities. 

Our risk team's processes for managing credit risk include a qualitative and quantitative risk assessment of significant counterparties prior to engaging in business activity, as well as on an ongoing basis. The review includes formal financial analysis and due diligence when appropriate.

Our risk team is responsible for approving new counterparties and establishing credit limits to manage credit risk exposure by counterparty and business line. The assigned limits reflect the various elements of assessed credit risk and are subsequently revised to correspond with changes in the counterparties’ credit profiles. Our risk team communicates counterparty limits to the business areas as well as senior management, and oversees compliance with the established limits.

Where appropriate, counterparty exposure is monitored on a daily basis and the collateral, if required, is marked to market daily to accurately reflect the current exposure.

Foreign Currency Risk

Our international businesses include transactions in currencies other than the U.S. dollar. As such, changes in foreign exchange rates relative to the U.S. dollar can affect the value of our non-U.S. dollar assets, liabilities, revenues

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and expenses. Additionally, our foreign subsidiaries in India and Sweden have a functional currency other than the U.S. dollar which exposes us to foreign currency transaction gains and losses. A portion of these risks are hedged, but fluctuations in currency exchange rates could impact our results of operations, financial position and cash flows.

Item 4. Controls and Procedures

(a) Disclosure Controls and Procedures. KCG's management, with the participation of KCG's Chief Executive Officer and Chief Financial Officer, has evaluated the effectiveness of disclosure controls and procedures (as such term is defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) as of the end of the period covered by this report. Based on such evaluation, KCG's Chief Executive Officer and Chief Financial Officer have concluded that, as of March 31, 2017, KCG's disclosure controls and procedures are effective.

(b) Changes in Internal Control Over Financial Reporting. There have not been any changes in KCG's internal control over financial reporting (as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the fiscal quarter covered by this report that have materially affected, or are reasonably likely to materially affect, KCG's internal control over financial reporting. 

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PART II

Item 1. Legal Proceedings

The information required by this Item is set forth in the “Legal Proceedings” section in Footnote 18 "Commitments and Contingent Liabilities" to the Company's Consolidated Financial Statements included in Part I, Item 1 "Financial Statements (Unaudited)" herein.

Item 1A. Risk Factors

In addition to the other information set forth below and in this report, you should carefully consider the factors discussed in Part I, Item 1A. “Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2016 which could materially affect our business, financial condition or future results. The risks described in our Annual Report on Form 10-K are not the only risks facing our Company. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial also may materially adversely affect our business, financial condition and/ or operating results. As of the date of this report, there have been no material changes to the risk factors disclosed in our most recent Annual Report on Form 10-K, with the exception of the following:

On April 20, 2017, the Company entered into an Agreement and Plan of Merger (the “Merger Agreement”) with Virtu Financial, Inc., a Delaware corporation (“Virtu”) and Orchestra Merger Sub, Inc., a Delaware corporation and indirect wholly owned subsidiary of Virtu (“Merger Sub”). The Merger Agreement provides for the merger of Merger Sub with and into the Company (the “Merger”), with the Company surviving the Merger as a wholly owned subsidiary of Virtu.

The announcement and pendency of the proposed Merger may adversely affect our business, financial condition and results of operations.

Uncertainty about the effect of the proposed Merger on our employees, customers, and other parties may have an adverse effect on our business, financial condition and results of operation regardless of whether the proposed Merger is completed. These risks to our business include the following, all of which could be exacerbated by a delay in the completion of the proposed Merger:

• the impairment of our ability to attract, retain, and motivate our employees, including key personnel

• the diversion of significant management time and resources towards the completion of the proposed Merger

• difficulties maintaining relationships with customers, counterparties, and other business partners

• delays or deferments of certain business decisions by our customers, counterparties, and other business partners

• the inability to pursue alternative business opportunities or make appropriate changes to our business because the Merger Agreement requires us to conduct our business in the ordinary course of business consistent with past practice and not engage in certain kinds of transactions prior to the completion of the proposed Merger

• potential litigation relating to the proposed Merger and the costs related thereto and

• the incurrence of significant costs, expenses, and fees for professional services and other transaction costs in connection with the proposed Merger.

Failure to consummate the proposed Merger within the expected timeframe or at all could have a material adverse impact on our business, financial condition and results of operations.

There can be no assurance that the proposed Merger will be consummated. The consummation of the proposed Merger is subject to the satisfaction or waiver of specified closing conditions, including (i) the affirmative vote in favor of the adoption of the Merger Agreement by the holders of a majority of our outstanding shares of common stock, (ii) the satisfaction of certain required regulatory approvals including the termination or expiration of the applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, (iii) the absence of a Company Material Adverse Effect (as defined in the Merger Agreement) after the date of the Merger Agreement and (iv) other customary closing conditions. There can be no assurance that these and other conditions to closing will be satisfied in a timely manner or at all.

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The Merger Agreement also provides that the Merger Agreement may be terminated by us or Virtu under certain circumstances, and in certain specified circumstances upon termination of the Merger Agreement we will be required to pay Virtu a termination fee of $45.0 million or up to $15.0 million in expenses. If we are required to make these payments, doing so may materially adversely affect our business, financial condition and results of operations. In addition, if the Merger is not completed by January 31, 2018, either KCG or Virtu may choose not to proceed with the Merger, and the parties can mutually decide to terminate the Merger Agreement at any time.

There can be no assurance that a remedy will be available to us in the event of a breach of the Merger Agreement by Virtu or Merger Sub or that we will wholly or partially recover for any damages incurred by us in connection with the proposed Merger. A failed transaction may result in negative publicity and a negative impression of us among our customers or in the investment community or business community generally. Further, any disruptions to our business resulting from the announcement and pendency of the proposed Merger, including any adverse changes in our relationships with our customers, partners, counterparties and employees, could continue or accelerate in the event of a failed transaction. In addition, if the proposed Merger is not completed, and there are no other parties willing and able to acquire the Company at a price of $20.00 per share or higher, on terms acceptable to us, the share price of our common stock will likely decline to the extent that the current market price of our common stock reflects an assumption that the proposed Merger will be completed.

Also, we have incurred, and will continue to incur, significant costs, expenses and fees for professional services and other transaction costs in connection with the proposed Merger, for which we will have received little or no benefit if the proposed Merger is not completed. Many of these fees and costs will be payable by us even if the proposed Merger is not completed and may relate to activities that we would not have undertaken other than to complete the proposed Merger.

In addition, the Merger Agreement restricts the Company from making certain acquisitions and taking other specified actions until the Merger occurs without the consent of Virtu (such consent not to be unreasonably withheld). These restrictions may prevent us from pursuing attractive business opportunities that may arise prior to the completion of the Merger.

Uncertainty about the effect of the Merger may impair our ability to retain personnel.

Uncertainty about the effect of the Merger on employees and customers may have an adverse effect on the Company. These uncertainties may impair our ability to attract, retain and motivate personnel until the Merger is completed, and could cause our customers and counterparties to seek to change existing business relationships with KCG. Retention of certain employees may be challenging during the pendency of the Merger, as certain employees may experience uncertainty about their future roles. If key employees depart because of issues relating to the uncertainty and difficulty of integration or a desire not to remain with the business, our business could be negatively impacted.

Lawsuits that may be filed against KCG and Virtu could result in an injunction preventing the completion of the Merger or a judgment resulting in the payment of damages.

Plaintiffs may file lawsuits against KCG or Virtu and/or their directors and officers in connection with the Merger. The outcome of any such litigation would be uncertain. If the cases are not resolved, these lawsuits could prevent or delay completion of the Merger and result in substantial costs to us, including any costs associated with the indemnification of directors and officers. One of the conditions to the closing of the Merger is that no order, injunction or decree issued by any court or agency of competent jurisdiction or other legal restraint or prohibition preventing the consummation of the Merger shall be in effect. As such, if plaintiffs are successful in obtaining an injunction prohibiting the completion of the Merger on the agreed-upon terms, then such injunction may prevent the Merger from being completed, or from being completed within the expected timeframe.

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Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

The following table contains information about our purchases of KCG Class A Common Stock during the first quarter of 2017 (in thousands, except average price paid per share):

Period	Total Number of Shares Purchased	Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs(1)	Approximate Dollar Value of Shares That May Yet Be Purchased Under the Plans or Programs
January 1, 2017 - January 31, 2017
Common stock repurchases	100			100	$	148,563
Employee transactions (2)	55			—
Total	155	$	14.19	100
February 1, 2017 - February 28, 2017
Common stock repurchases	583			583	$	140,228
Employee transactions (2)	1,028			—
Total	1,611	$	14.27	583
March 1, 2017 - March 31, 2017
Common stock repurchases	250			250	$	136,763
Employee transactions (2)	13			—
Total	263	$	13.93	250
Total
Common stock repurchases	933			933	$	136,763
Employee transactions (2)	1,096			—
Total	2,029	$	14.22	933

Totals may not add due to rounding.

⁽¹⁾ In January 2017, our Board of Directors authorized a program to repurchase up to a total of $150.0 million in shares of our Class A Common Stock and Warrants. This new program supersedes all prior repurchase authority. We may repurchase shares from time to time in open market transactions, accelerated stock buyback programs, tender offers, privately negotiated transactions or by other means. Repurchases may also be made under Rule 10b5-1 plans. The timing and amount of repurchase transactions will be determined by our management based on its evaluation of market conditions, share price, legal requirements and other factors. The program may be suspended, modified or discontinued at any time without prior notice. We caution that there are no assurances that any further repurchases will actually occur. As noted previously, pursuant to the Merger Agreement, we are unable to purchase shares of KCG Class A Common Stock or Warrants-other than pursuant to existing restricted stock purchase agreements with current or former employees or in connection with the acceptance of KCG Class A Common Stock for purposes of paying the exercise price of outstanding stock options or tax withholding-without the prior written consent of Virtu (such consent not to be unreasonably withheld).

⁽²⁾ Represents shares of KCG Class A Common Stock withheld in satisfaction of tax withholding obligations upon vesting of employee restricted equity awards.

Item 3. Defaults Upon Senior Securities

Not applicable.

Item 4. Mine Safety Disclosures

Not applicable.

Item 9B. Other Information

Not Applicable.

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PART IV

Item 6. Exhibits

NUMBER ASSIGNED TO EXHIBIT (I.E. 601 OF REGULATION S-K)	DESCRIPTION OF EXHIBITS
2.1	Agreement and Plan of Merger, dated April 20, 2017, by and among Virtu Financial, Inc., Orchestra Merger Sub, Inc. and KCG Holdings, Inc. - Incorporated herein by reference to Exhibit 2.1 of the Registrant’s Form 8-K Current Report filed on April 21, 2017
10.1*	KCG Holdings, Inc. Deferred Cash Award Agreement, 2016 Year-End Version (US)
10.2*	KCG Holdings, Inc. Deferred Cash Award Agreement, 2016 Year-End Version (UK)
31.1*	Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2*	Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32.1*	Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2*	Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101**	The following financial statements from KCG Holdings, Inc's Quarterly Report on Form 10-Q for the three months ended March 31, 2017, formatted in XBRL (eXtensible Business Reporting Language): (i) Consolidated Statements of Financial Condition at March 31, 2017 and December 31, 2016, (ii) Consolidated Statements of Operations for the three months ended March 31, 2017 and 2016 (iii) Consolidated Statements of Comprehensive Income for the three months ended March 31, 2017 and 2016, (iv) Consolidated Statement of Changes in Equity for the three months ended March 31, 2017 (v) Consolidated Statements of Cash Flows for the three months ended March 31, 2017 and 2016 and (vi) the Notes to Consolidated Financial Statements.

________________________________________ 

*	Filed herewith.
**	Pursuant to rule 406T of Regulation S-T, the Interactive Data Files on Exhibit 101 hereto are deemed not filed for purposes of Sections 11 or 12 of the Securities Act of 1933, as amended, are deemed not filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and otherwise are not subject to liability under those sections.

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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized, on this 8th day of May 2017.

KCG HOLDINGS, INC.
By:	/s/ DANIEL COLEMAN
	Daniel Coleman
	Chief Executive Officer

By:	/s/ STEFFEN PARRATT
	Steffen Parratt
	Chief Financial Officer

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EX-10.1

EXHIBIT 10.1

2016 Year-End Version (US)

KCG HOLDINGS, INC.

DEFERRED CASH AWARD AGREEMENT

Name of Grantee:	[ ]
Amount of Deferred Cash Award:	$[ ]
Grant Date:	[ ]
Grant Number:	[ ]
Vesting Dates:	[ ], 2018 (the “First Vesting Date”)   [ ], 2019 (the “Second Vesting Date)   [ ], 2020 (the “Third Vesting Date”)

*    *    *    *    *    *    *    *

This Award Agreement (this “Agreement”) governs your 2016 deferred cash award (the “Deferred Cash Award”) granted to you by KCG Holdings, Inc. (the “Company”) as part of your discretionary compensation for services provided during 2016 and as an incentive for you to remain in employment and provide services to the Company or any Affiliate of the Company through the Vesting Dates listed above. You should read carefully this Agreement, which includes Annex A (containing Applicable Restrictive Covenants described in more detail under Section 6) and Annex B (containing definitions for certain capitalized terms that are not defined in the body of this Agreement).

1. The Company hereby grants you the Deferred Cash Award, which constitutes an unfunded and unsecured promise to pay to you, subject to the terms and conditions of this Agreement, the amount set forth above, plus any accrued interest as described in Section 4, on the date or dates provided in this Agreement.

2. Except as otherwise provided in this Agreement, your Deferred Cash Award is unvested, which means that it is subject to a condition that you remain actively employed by the Company and that you comply with the Applicable Restrictive Covenants, in each case, through the applicable Vesting Date in order for you to receive payment in respect thereof. The “Restricted Vesting Period” is the period from the Grant Date until the applicable Vesting Date during which these vesting conditions apply.

3. Except as otherwise provided in this Agreement, the Deferred Cash Award will be paid to you in three substantially equal installments (before giving effect to the additional amount credited to such award under Section 4) reasonably promptly (but no more than 30 days) after each Vesting Date. Until such payment, you have only the rights of a general unsecured creditor of the Company.

4. During the Restricted Vesting Period, the unpaid portion of your Deferred Cash Award will accrue interest at the rate then in effect (the “Discretionary Interest Rate”) as

determined by the Compensation Committee of the Board of Directors of the Company (the “Board”) or such other committee or individual as appointed by the Board, in its sole discretion (the “Committee”). The Committee will determine the Discretionary Interest Rate that will apply to your Deferred Cash Award (i) between the Grant Date and the First Vesting Date, (ii) between the First Vesting Date and the Second Vesting Date and (iii) between the Second Vesting Date and the Third Vesting Date. Any references to the “Deferred Cash Award” shall be deemed to include any additional amount credited to such award under this Section 4 and any credited amounts so accrued shall vest and be paid to in accordance with Sections 2 and 3.

5. Except as otherwise provided for in your Employment Agreement, if applicable:

(a) if your employment with, or provision of services to, the Company or any of its Affiliates is terminated by the Company or any of its Affiliates without Cause, or otherwise terminates on account of your death or Disability, the vesting conditions applicable to the Deferred Cash Award will lapse and the unpaid portion of the Deferred Cash Award will be paid to you (or the representative of your estate) reasonably promptly (but no more than 30 days) thereafter, together with any interest credited to your Deferred Cash Award under Section 4 through the date of your termination;

(b) if your employment with, or provision of services to, the Company or any of its Affiliates is terminated for Cause, all of your rights to your Deferred Cash Award will terminate and your Deferred Cash Award will be cancelled without any payment to you;

(c) if your employment with, or provision of services to, the Company or any of its Affiliates terminates for any reason other than as set forth in Sections 5(a) and 5(b), your Deferred Cash Award will continue to vest as if your employment with the Company or any of its Affiliates had continued, subject to Section 6 which will continue to apply through the remainder of the Restricted Vesting Period.

6. If during the Restricted Vesting Period, you breach or otherwise take any action that is prohibited by an Applicable Restrictive Covenant, all of your rights to your Deferred Cash Award will terminate and your Deferred Cash Award will be cancelled without any payment to you. You understand that your eligibility for the continued vesting of your Deferred Cash Award pursuant to Section 5(c) is contingent on your ongoing compliance with the Applicable Restrictive Covenants for the duration of the Restricted Vesting Period regardless of the length of the protected period or similar restrictive covenant period which you are required to comply under an Employment Agreement, award agreement or other agreement you have with the Company.

For purposes of this Agreement, “Applicable Restrictive Covenant” includes (i) any restrictive covenant provision (including, but not limited to a non-competition, non-solicitation and/or confidentiality restriction) applicable you under an Employment Agreement, award agreement or other agreement you have with the Company and (ii) to the extent you are not subject to a restrictive covenant provision as provided in clause (i) at the Grant Date, the restrictive covenant provisions set forth on Annex B of this Agreement (which, for purposes of this Agreement shall be deemed to apply for the duration of the Restricted Vesting Period).

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7. You acknowledge that as a condition to accepting payment of your Deferred Cash Award, you may be required to certify to the Company, in the form and manner determined by the Company in its sole discretion, that you have complied with all terms and conditions of this Agreement, including the Applicable Restrictive Covenants. You understand and agree that:

(a) if the Company determines, in its sole discretion, that you have failed to comply with all terms and conditions of this Agreement, all of your rights to your Deferred Cash Award will terminate and your Deferred Cash Award will be cancelled without any payment to you; and

(b) (i) your address on file with the Company at the time any certification is required will be deemed to be your current address, (ii) it is your responsibility to inform the Company of any changes to your address to ensure timely receipt of the certification materials, (iii) you are responsible for contacting the Company to obtain such certification materials if not received and (iv) your failure to return properly completed certification materials by the specified deadline (which includes your failure to timely return the completed certification because you did not provide the Company with updated contact information) will result in the cancellation of your Deferred Cash Award without any payment to you. For the avoidance of doubt, references in this Section 7(b) to your address are inclusive of your email address and references to your receipt and return of certification materials are inclusive of such actions taken by means of electronic communication.

8. If at any time within two (2) years after a Vesting Date (a “realization event”), you (a) are terminated for Cause, (b) engage in or have engaged in any activity that is a violation of an Applicable Restrictive Covenant during the protected period or similar restrictive covenant period, (c) violate or have violated any confidentiality or proprietary information obligation you owe to the Company (including, but not limited to, the confidentiality or proprietary information obligations in any non-compete agreement, Employment Agreement, employee handbook, non-disclosure agreement, Code of Business Conduct or Ethics, equity award agreement or any other agreement signed by you that contains such obligations), and/or (d) engage in or have engaged in any act of fraud against the Company, then you hereby agree that the amount of the Deferred Cash Award that became vested at the realization event shall be paid by you to the Company upon notice from the Company (the “Repayment Amount”). The Repayment Amount shall be determined on a gross basis, without reduction for any taxes incurred, as of the date of the realization event. The Company shall have the right to offset the Repayment Amount against any amounts otherwise owed to you by the Company (whether as wages, vacation pay or pursuant to any benefit plan or other compensatory arrangement) to the extent permissible under applicable law, including Section 409A. Additionally, the Deferred Cash Award is subject to the Company’s Compensation Recoupment Policy, if applicable to you, which can cause the forfeiture of the Deferred Cash Award.

9. Without limiting the application of Sections 12 and 13, in the event of a Change-In-Control the Committee reserves the right, in its sole discretion, to accelerate the vesting of the Deferred Cash Award, but shall have no obligation to take any such action. In the absence of any such action under this Section 9, the Deferred Cash Award shall continue in effect in accordance with its terms. Notwithstanding anything to the contrary in Section 5, in the event that you cease to be an Employee (including by reason of the

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Company’s sale or divestiture of a business unit or otherwise where such transaction is not a Change-In-Control), the Committee shall, in its sole discretion, have the authority to provide that (A) the vesting restrictions applicable to any unvested portion of your Deferred Cash Award shall lapse upon the effective time of completion of such sale or divestiture or (B) (i) any unvested portion of your Deferred Cash Award not be forfeited upon such termination and (ii) you continue to vest in the Deferred Cash Award in accordance with the Vesting Dates set forth above, subject to satisfaction of any other vesting conditions the Committee deems reasonable and appropriate (including, without limitation, your continued employment with a third party following a sale or divestiture by the Company of a business unit or otherwise).

10. The Company’s obligation to make a payment of the Deferred Cash Award shall be subject to applicable federal, state and local tax withholding requirements. To the extent that the Company is required to withhold any Federal, state or local taxes in respect of any compensation income realized by you in respect of a Deferred Cash Award, then the Company shall deduct from any payments of any kind otherwise due to you the aggregate amount of such Federal, state or local taxes required to be so withheld. If no such payments are due or to become due, or if such payments are insufficient to satisfy such Federal, state or local taxes, then you will be required to pay to the Company, or make other arrangements satisfactory to the Company regarding payment to the Company of, the aggregate amount of any such taxes.

11. Except with the consent of the Committee, you may not sell, pledge, hypothecate, assign, transfer or otherwise encumber the Deferred Cash Award, other than by will or the laws of descent and distribution. This prohibition includes any assignment or other transfer that purports to occur by operation of law or otherwise. During your lifetime, payments relating to the Deferred Cash Award will be made only to you and any attempt to sell, pledge, hypothecate, assign, transfer or otherwise encumber the Deferred Cash Award shall be void.

12. All matters with respect to the Deferred Cash Award will be determined by the Committee or its designee. The Committee has the authority and discretion to select those persons who shall receive Deferred Cash Awards, to determine the time or times of receipt, to establish the terms, conditions, performance criteria, restrictions or other provisions of the Deferred Cash Awards, and, subject to the restrictions of Section 14, to modify, amend or terminate the Deferred Cash Awards. The Committee’s determinations regarding Deferred Cash Awards (including, without limitation, the amount and timing of such awards, the terms and provision of such awards and the agreements evidencing the same) need not be uniform and may be made by it selectively among individuals who receive, or are eligible to receive Deferred Cash Awards. Except to the extent prohibited by applicable law, the Committee may delegate to any person or persons all or any part of its responsibilities and powers as set forth in this Agreement, and may revoke such delegation at any time.

13. The Committee is authorized to establish, amend and rescind such rules and regulations as it deems necessary or advisable for the proper administration of Deferred Cash Awards and to take such other action in connection with or in relation to such Deferred Cash Awards as it deems necessary or advisable. Each action and determination made by the Committee with respect to the Deferred Cash Award will be final and conclusive. No employee of the Company or any member of the Board will be personally liable for any action, determination or interpretation made in good faith with respect to this Agreement or the Deferred Cash Award granted hereto.

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14. The Committee may at any time terminate, modify or amend the Deferred Cash Award in such respects as it shall deem advisable; provided, however; that no termination, modification or amendment of any outstanding Deferred Cash Award may, without your consent, adversely affect your rights with respect to the outstanding Deferred Cash Award.

15. This Agreement does not constitute a contract of employment, nor does it give you the right to be retained in the employ of the Company or any Affiliate, or the right to continue to provide services to the Company or any Affiliate, in each case, for any particular period or on any particular basis of compensation. Nothing contained in this Agreement, and no action of the Company or the Committee with respect to this Agreement, will interfere in any way with the right of the Company or an Affiliate to terminate your employment at any time, for any reason or for no reason.

16. By executing this Agreement and acknowledging the terms and conditions set forth herein, you will be deemed to have agreed that this Deferred Cash Award is special incentive compensation that will not be taken into account, in any manner, as salary, compensation or bonus in determining the amount of any payment under any health and welfare, pension, retirement or other employee benefit plan, program or policy of the Company or any Affiliate.

17. You will not, by reason of this Agreement, acquire any right in or title to any assets, funds or property of the Company or any Affiliate, including, without limitation, any specific funds, assets or other property which the Company or any Affiliate in its sole discretion may set aside in anticipation of a liability under this Agreement. You will only have a contractual right to the amounts, if any, payable under this Agreement, unsecured by any assets of the Company or any Affiliate, and nothing contained in this Agreement shall constitute a guarantee that the assets of the Company or any Affiliate shall be sufficient to pay any benefits to any person.

18. The Company and you hereby irrevocably submit to the exclusive jurisdiction of any state or federal court of appropriate jurisdiction located in New York, New York over any suit, action or proceeding arising out of or relating to or concerning this Agreement that is not otherwise arbitrated or resolved according to Section 19.

(a) The Company and you acknowledge that the forum designated by this section has a reasonable relation to this Agreement and to the relationship between the Company and you. Notwithstanding the foregoing, nothing herein shall preclude the Company from bringing any action or proceeding in any other court for the purpose of enforcing the provisions of this section.

(b) The agreement by the Company and you as to forum is independent of the law that may be applied in the action, and the Company and you (i) agree to such forum even if the forum may under applicable law choose to apply non-forum law, (ii) hereby waive, to the fullest extent permitted by applicable law, any objection which the Company or you now or hereafter may have to personal jurisdiction or to the laying of venue of any such suit, action or proceeding in any court referred to in this section, (iii) undertake not to commence any suit, action or proceeding arising out of or relating to or concerning this Agreement in any forum other than the forum described in this section, and (iv) agree that, to the fullest extent permitted by applicable law, a final and non-appealable judgment in any such suit, action or proceeding in any such court shall be conclusive and binding upon the Company and you.

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(c) You hereby irrevocably appoint the General Counsel of the Company as your agent for service of process in connection with any action, suit or proceeding arising out of or relating to or concerning this Agreement that is not otherwise arbitrated or resolved according to Section 19.

(d) You agree to keep confidential the existence of, and any information concerning, a dispute, controversy or claim described in this section, except that you may disclose information concerning such dispute, controversy or claim to the arbitrator or court that is considering such dispute, controversy or claim or to your legal counsel (provided that such counsel agrees not to disclose any such information except as necessary to the prosecution or defense of the dispute, controversy or claim).

19. Subject to the provisions of Section 18 above, any dispute, controversy or claim between the Company and you, arising out of or relating to or concerning this Agreement will be finally settled by binding arbitration in New York, New York before, and in accordance with the rules then obtaining of, the Financial Industry Regulatory Authority (“FINRA”) or, if FINRA declines to arbitrate the matter (or if the matter otherwise is not arbitrable by it), the American Arbitration Association (the “AAA”) in accordance with the commercial arbitration rules of the AAA. Prior to arbitration, all claims maintained by you must first be submitted to the Committee in accordance with claims procedures determined by the Committee.

20. If you attempt to have any dispute that arises out of or relates to this Agreement resolved in any manner that is not provided for by Sections 18 and 19 above, then (i) any outstanding portion of the Deferred Cash Award (whether vested or unvested) shall be forfeited and (ii) any amounts paid in respect of the Deferred Cash Award shall be repaid by you to the Company upon notice from the Company in the manner set forth in Section 8.

21. The obligation of the Company to make payments in respect of the Deferred Cash Award granted under this Agreement is specifically subject to all provisions of this Agreement, and all applicable laws, rules, regulations and governmental approvals.

22. The grant of the Deferred Cash Award is not enforceable until this Agreement has been signed by the Company and acknowledged by you. By acknowledging this Agreement, you shall be deemed to have accepted and consented to any action taken under this Agreement by the Committee, the Board or any of their delegates.

23. No change or modification of this Agreement shall be valid unless it is in writing and signed by the parties hereto.

24. Any notice by you to the Company hereunder shall be in writing and shall be deemed duly given only upon receipt thereof by the Company at its principal offices. Any notice by the Company to you shall be in writing and shall be deemed duly given if mailed to you at the address on file with the Company.

25. The grant of Deferred Cash Awards shall not be construed as creating any limitations on the power of the Board to adopt such other incentive arrangements as it may deem advisable, and such arrangements may be either generally applicable or applicable only in specific cases.

26. The validity and construction of this Agreement shall be governed by the laws of the State of Delaware, without regard to the conflicts of law principles thereof.

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27. This Agreement sets forth all of the promises, agreements, conditions, understandings, warranties and representations between the parties hereto regarding the Deferred Cash Award, and there are no promises, agreements, conditions, understandings, warranties or representations, oral or written, express or implied, between them regarding the Deferred Cash Award other than as set forth herein or therein.

28. The intent of the parties is that payments and benefits under this Agreement comply with Section 409A to the extent subject thereto, and, accordingly, to the maximum extent permitted, this Agreement shall be interpreted and be administered consistent with such intent. Notwithstanding anything contained herein to the contrary, to the extent required in order to avoid accelerated taxation and/or tax penalties under Section 409A, you shall not be considered to have terminated employment with the Company for purposes of this Agreement and no payment shall be due to you under Section 5(a) of this Agreement until you would be considered to have incurred a “separation from service” from the Company within the meaning of Section 409A. Any payments that are due within the “short term deferral period” as defined in Section 409A shall not be treated as deferred compensation unless applicable law requires otherwise. Notwithstanding anything to the contrary in this Agreement, to the extent that any amounts are payable upon a “separation from service” and such payment would result in the imposition of any additional tax and penalties imposed under Section 409A, the payment of such amounts shall instead be made on the first business day after the date that is six (6) months following such separation from service (or death, if earlier) to the extent any such delay would avoid the imposition of such tax or penalty. In addition, each amount to be paid or benefit to be provided to you pursuant to this Agreement, which constitutes deferred compensation subject to Section 409A, shall be construed as a separate identified payment for purposes of Section 409A.

29. As used in this Agreement, “the Company” shall mean the Company as hereinbefore defined and any successor to its business and/or assets, whether direct or indirect, by purchase, merger, consolidation, the transfer of property, stock or goodwill or otherwise. This Agreement shall automatically inure to the benefit of, and be enforceable by the Company, including its successors, and assigns, without the need for any further action or approval by you. You specifically agree that this Agreement may be assigned by the Company and enforced by any assignee or successor of the Company.

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By acknowledging this Agreement in a method to be determined by the Company, you accept and agree to all of the foregoing terms and provisions and to all of the terms and provisions. The provisions in this Agreement (including, without limitation, the Applicable Restrictive Covenants) shall not supersede, modify, replace or cancel any existing contractual obligations, including but not limited to restrictive covenants, applicable you in any Employment Agreement, prior equity award agreements or other agreement with the Company.

IN WITNESS WHEREOF, the Company has caused this Agreement to be executed by a duly authorized representative as of the Grant Date.

KCG HOLDINGS, INC.

By: /s/ DANIEL COLEMAN

Daniel B. Coleman

Chief Executive Officer

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Annex A: Applicable Restrictive Covenants

This Annex A is incorporated into and comprises part of your Agreement. Capitalized terms that are not defined in the body of this Annex A are defined in the Agreement or in Annex B.

a) During the Restricted Vesting Period, Grantee agrees to not, directly or indirectly, alone or in association with or on behalf of any other person, engage in any Competitive Activity.

i. “Competitive Activity” means:

A. Engaging in a Competitive Business for Grantee’s own benefit or for the benefit of any other person;

B. Providing services to any person engaged in a Competitive Business, whether as an employee, consultant, officer, director, manager, partner, principal, agent, or in any other capacity, that are similar to the services Grantee provided for Company or that Grantee possessed Confidential Information about while employed by Company; or

C. Controlling (by contract, equity ownership or otherwise), investing in (except as the owner of up to 3% of the securities of a publicly traded entity) or providing other financial support to any person engaged in a Competitive Business.

ii. “Competitive Business” means:

A. Engaging in high frequency algorithmic transactions in any way involving any electronically tradeable product or commodity (including any security (equity or debt), derivatives, fixed income, cash, currency, or other financial instruments, or any other tangible or intangible item) through any exchange, electronic trading venue or platform, whether or not using proprietary trading methods or systems, in which Company was engaged at the time Grantee’s employment for Company terminates, or in which Company engaged during the 12 months preceding the termination of Grantee’s employment, or in which Company has plans to engage in at the time of the termination of Grantee’s employment and that Grantee was aware of, or possessed Confidential Information about, at the time of the termination of Grantee’s employment; or

B. Engaging in any activities that are similar to, competitive with or a functional substitute for activities or Confidential Information Grantee had knowledge of and that Company engaged in or planned to engage in at any time during the 12 months preceding the termination of Grantee’s employment.

C. “High frequency algorithmic transactions” means buying, selling, trading, or engaging in any other similar transaction where orders are determined by an automated model and placed on an automated basis.

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b) During the Restricted Vesting Period, Grantee agrees to notdirectly or indirectly, alone or in association with or on behalf of any other person contact or solicit any client or potential client introduced to Grantee by Company, or that Grantee knew of or about solely as a result of Grantee’s employment with Company, for the purpose of offering, providing or selling, products or services competitive with or similar to products or services offered by, developed by, designed by, distributed by, or sold by Company.

For purposes of this Annex A, a “potential client” is a person, company, and/or entity that Grantee had direct contact with or possessed Confidential Information about during the last 18 months of Grantee’s Company employment, as well as any person, company or entity Grantee knew Company was contacting during the last 18 months of Grantee’s employment regarding the use of Company products or services.

c) During the Restricted Vesting Period, Grantee will not, directly or indirectly, alone or in association with or on behalf of any other person:

i. Induce or solicit any person who is an employee or consultant to the Company to terminate their employment or engagement with Company or modify their relationship with Company in a way that is adverse to Company; or hire or otherwise use the services of any person who provided services to Company as an employee or consultant (other than services offered generically to the public by such person, e.g., telecommunications services) within 12 months prior to Grantee’s termination for purposes of engaging in a Competitive Business;

ii. Interfere with or induce any person to make a material adverse change in any business relationship between Company and its suppliers, members, lenders, business partners and any other person in a business relationship with Company where Company has a reasonable expectation that the relationship would continue without such change; or

iii. Participate or engage in any trade or commercial disparagement of the business or operations of Company and/or disparage the professional and/or personal lives of any individual manager, officer or employee of Company, or give interviews, provide comment, information or opinions, positive or negative, to any publicly available media resource or employee, contractor or representative, regardless of the format and intent of that media.

d) Grantee will not engage in any unauthorized use or disclosure of the Company’s Confidential Information. “Confidential Information” means any information of or about the Company that is not generally known to the public, including (i) information that can be used in the operation of the Company’s business and is sufficiently valuable and secret to afford the Company with actual or potential economic advantage, (ii) all forms of financial, business, employee, technical, economic, engineering and design information, plans and strategies, forecasts, know-how, systems, processes, software, algorithms, mathematical models, valuation models, trading models or strategies, information relating to modeling relationships among interest rate market instruments, trading and hedging strategies and paradigms, firmware, trading technologies, the use of trading platform software (including all front-end, middleware and exchange connectivity components or subsystems and analysis and conclusions related to the Company’s technology), proprietary computer code, computer and network hardware and configurations not generally known to the public and in all events whether tangible or intangible and whether or not stored, compiled or memorialized physically, electronically, graphically, photographically or in any other media, (iii) information

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that is a trade secret or is subject to trade secret or similar regulation under any state or federal statute or regulation, (iv) confidential or secret information of or about other persons that is known to the Company, and (v) information labeled “confidential” or otherwise marked with a restriction on disclosure. Confidential Information does not include any information that is or becomes generally known to the public without the breach of any duty by me or any other person, or through improper means.

e) During the Restricted Vesting Period and at all times thereafter, Grantee will:

i. Hold all Confidential Information as a fiduciary in trust and use it only for the benefit of the Company in properly performing Grantee’s employment duties for the Company;

ii. Maintain Confidential Information in strict confidence and secrecy;

iii. Not, except as specifically directed by the Company in performing employment duties for the Company, communicate or disclose Confidential Information in any manner to any person within or outside the Company who is not authorized to know, use or receive such Confidential Information; and

iv. Comply with the Company’s procedures on dealing with Confidential Information and in all events use best efforts to prevent the inadvertent disclosure of Confidential Information.

v. If subject to a valid subpoena, or other order of any governmental entity or similar legal requirement that might seek disclosure of Confidential Information, and to the extent permitted by law, furnish a copy of such subpoena, order or other legal requirement to the Company’s General Counsel as soon as practicable, but no later than 48 hours after Grantee receives it, cooperate with the Company’s efforts to obtain a protective order or similar relief, and only disclose the minimum amount of Confidential Information necessary.

vi. At any time upon the Company’s request and within 48 hours of Grantee’s termination of employment with the Company, deliver all Confidential Information in Grantee’s possession to the Company and not retain any originals or copies of the Confidential Information.

vii. Not disclose to the Company any confidential or proprietary information belonging to any other person that Grantee is under any obligation to keep in confidence.

f) Nothing in any in any code, agreement, manual or in any other policies, procedures or agreements of the Company (including this Agreement and the Plan) shall prohibit or restrict any current or former Company employee or their counsel from providing information in connection with: (a) any disclosure of information required by law or legal process, (b) reporting possible violations of federal or state law or regulation to any governmental agency, commission or entity, including but not limited to, the Department of Justice, the Commodities Futures Trading Commission, the Securities and Exchange Commission, the Department of Labor, the Congress, any state Attorney General, self-regulatory organization and any agency Inspector General (collectively “Government Agencies”), (c) filing a charge or complaint with Government Agencies,(d) making disclosures that are protected under the whistleblower provisions of federal or state law or regulation (collectively the “Whistleblower Statutes”), or (e) from initiating

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communications directly with, responding to any inquiry from, volunteering information to, testifying or otherwise participating in or assisting in any inquiry, investigation or proceeding brought by Government Agencies in connection with (a) through (d). Any current or former Company employee is not required to advise or seek permission from the Company before engaging in any activity set forth in (a) through (e). Further, the Company does not in any manner limit the right of any current or former Company employee to receive an award from Government Agencies for information provided to Government Agencies or pursuant to the Whistleblower Statutes.

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Annex B: Definitions

“Affiliate” means any corporation, partnership, joint venture or other entity during any period in which at least a twenty-five percent voting or profits interest is owned, directly or indirectly, by the Company (or by any entity that is a successor to the Company), and any other business venture designated by the Committee in which the Company (or any entity that is a successor to the Company) has a significant interest, as determined in the discretion of the Committee.

“Cause” means any definition ascribed thereto in any Employment Agreement, severance agreement, change in control agreement or similar agreement with the Company or an Affiliate to which such Grantee is a party or, in the absence thereof, shall mean (i) a felony conviction of the Grantee, (ii) the commission by the Grantee of an act of fraud or embezzlement against the Company, (iii) the Grantee’s willful misconduct or gross negligence materially detrimental to the Company, (iv) the Grantee’s wrongful dissemination or use of confidential or proprietary information or (v) the intentional and habitual neglect by the Grantee of his duties to the Company.

“Change-In-Control” means the first to occur of:

i. the acquisition by any “person” (as such term is used in Sections 13(d) and 14(d) of the Securities Exchange Act of 1934, as amended from time to time (the “Exchange Act”)) of “beneficial ownership” (within the meaning of Rule 13d-3 of the Exchange Act), directly or indirectly, of securities of the Company representing thirty-five percent or more of either the then outstanding Shares or the combined voting power of the Company’s then outstanding voting securities entitled to vote generally in the election of directors; provided, however, that for purposes of this subsection (i), the following transactions shall not constitute a Change-In-Control: (A) an acquisition by the Company, (B) an acquisition by any employee benefit plan (or related trust) sponsored or maintained by the Company, (C) an acquisition by an entity owned, directly or indirectly, by the stockholders of the Company in substantially the same proportions as their ownership of Shares, (D) an acquisition by an entity pursuant to a Business Combination (as defined below in subsection) that satisfies clauses (A), (B) and (C) of such subsection or (E) any acquisition directly from the Company;

ii. the following individuals cease for any reason to constitute a majority of the Company’s Directors then serving: individuals who as of the date hereof constitute the Board (the “Initial Directors”) and any new Director (a “New Director”) whose appointment or election by the Board or nomination for election by the Company’s stockholders was approved or recommended by a vote of at least two-thirds of the Directors then in office who either are Initial Directors or New Directors; provided, however, that a Director 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 Company shall not be considered a New Director;

iii. the occurrence or consummation of a reorganization, merger or consolidation or a sale or disposition of all or substantially all of the Company’s assets (a “Business Combination”), other than a Business Combination in which (A) the voting securities of the Company outstanding immediately prior thereto and entitled to vote generally in the election of directors continue to represent (either by remaining outstanding or by being converted into voting securities of the surviving entity or any parent thereof) more than fifty percent of the combined voting power of the voting securities of the Company or such surviving entity or parent outstanding immediately after such Business Combination and entitled to vote generally in the election of directors; (B) no “person” (as hereinabove defined), other than the Company, an employee benefit plan (or related trust) sponsored or maintained by the Company, or an entity resulting from such Business Combination, acquires more than thirty-five percent of the combined voting power of the Company’s then outstanding securities entitled to vote generally in the election of directors, and (C) at least a majority of the members of the board

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of directors of the entity resulting from such Business Combination were Initial Directors or New Directors at the time of the execution of the initial agreement, or action of the Board, providing for such Business Combination; or

iv. the stockholders of the Company approve a plan of complete liquidation or dissolution of the Company.

“Code” means the Internal Revenue Code of 1986, as amended from time to time, or any successor statute or statutes thereto, and any rules or regulations promulgated thereunder.

“Director” means a duly elected member of the Board.

“Disability” means that the Grantee is unable to engage in any substantial gainful activity by reason of any medically determinable physical or mental impairment that can be expected to result in death or can be expected to last for a continuous period of not less than 12 months.

“Employee” means a common law employee (as defined in Section 3401(c) of the Code) of the Company or any Affiliate of the Company. The term “Employee” will also include an individual who is granted an Deferred Cash Award, in connection with his hiring by the Company or any Affiliate, prior to the date the individual first becomes an Employee, but if and only if such Deferred Cash Award does not vest prior to the date the individual first becomes an Employee.

“Employment Agreement” means the Grantee’s contract of employment with the Company or any Affiliate of the Company (including, for the avoidance of doubt, any such contract in the form of an offer letter or otherwise), outlining the terms and conditions of Grantee’s employment with a Group Company (as such contract of employment may be amended from time to time) as of the date of this Agreement.

“Section 409A” means Section 409A of the Code.

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EX-10.2

EXHIBIT 10.2

2016 Year-End Version (UK)

KCG HOLDINGS, INC.

DEFERRED CASH AWARD AGREEMENT

Name of Grantee:	[ ]
Amount of Deferred Cash Award:	$[ ]
Grant Date:	[ ]
Grant Number:	[ ]
Vesting Dates:	[ ], 2018 (the “First Vesting Date”)   [ ], 2019 (the “Second Vesting Date)   [ ], 2020 (the “Third Vesting Date”)

*    *    *    *    *    *    *    *

This Award Agreement (this “Agreement”) governs your 2016 deferred cash award (the “Deferred Cash Award”) granted to you by KCG Holdings, Inc. (together with the Group Companies, the “Company”) as part of your discretionary compensation for services provided during 2016 and as an incentive for you to remain in employment and provide services to the Company or any Affiliate of the Company through the Vesting Dates listed above. You should read carefully this Agreement, including Annex A, which contains definitions for certain capitalized terms that are not defined in the body of this Agreement.

1. The Company hereby grants you the Deferred Cash Award, which constitutes an unfunded and unsecured promise to pay to you, subject to the terms and conditions of this Agreement, the amount set forth above, plus any accrued interest as described in Section 4, on the date or dates provided in this Agreement.

2. Except as otherwise provided in this Agreement, your Deferred Cash Award is unvested, which means that it is subject to a condition that you remain actively employed by the Company and that you comply with the Applicable Restrictive Covenants, in each case, through the applicable Vesting Date in order for you to receive payment in respect thereof. The “Restricted Vesting Period” is the period from the Grant Date until the applicable Vesting Date during which these vesting conditions apply.

3. Except as otherwise provided in this Agreement, the Deferred Cash Award will be paid to you in three substantially equal installments (before giving effect to the additional amount credited to such award under Section 4) reasonably promptly (but no more than 30 days) after each Vesting Date. Until such payment, you have only the rights of a general unsecured creditor of the Company.

4. During the Restricted Vesting Period, the unpaid portion of your Deferred Cash Award will accrue interest at the rate then in effect (the “Discretionary Interest Rate”) as determined by the Compensation Committee of the Board of Directors of the Company

(the “Board”) or such other committee or individual as appointed by the Board, in its sole discretion (the “Committee”). The Committee will determine the Discretionary Interest Rate that will apply to your Deferred Cash Award (i) between the Grant Date and the First Vesting Date, (ii) between the First Vesting Date and the Second Vesting Date and (iii) between the Second Vesting Date and the Third Vesting Date. Any references to the “Deferred Cash Award” shall be deemed to include any additional amount credited to such award under this Section 4 and any credited amounts so accrued shall vest and be paid to in accordance with Sections 2 and 3.

5. Except as otherwise provided for in your Employment Agreement, if applicable:

(a) if your employment with, or provision of services to, the Company or any of its Affiliates is terminated by the Company or any of its Affiliates without Cause, or otherwise terminates on account of your death or Disability, the vesting conditions applicable to the Deferred Cash Award will lapse and the unpaid portion of the Deferred Cash Award will be paid to you (or the representative of your estate) reasonably promptly (but no more than 30 days) thereafter, together with any interest credited to your Deferred Cash Award under Section 4 through the date of your termination;

(b) if your employment with, or provision of services to, the Company or any of its Affiliates is terminated for Cause, all of your rights to your Deferred Cash Award will terminate and your Deferred Cash Award will be cancelled without any payment to you;

(c) if your employment with, or provision of services to, the Company or any of its Affiliates terminates for any reason other than as set forth in Sections 5(a) and 5(b), your Deferred Cash Award will continue to vest as if your employment with the Company or any of its Affiliates had continued, subject to Section 6 which will continue to apply through the remainder of the Restricted Vesting Period.

6. If during the Restricted Vesting Period, you breach or otherwise take any action that is prohibited by an Applicable Restrictive Covenant, all of your rights to your Deferred Cash Award will terminate and your Deferred Cash Award will be cancelled without any payment to you. You understand that your eligibility for the continued vesting of your Deferred Cash Award pursuant to Section 5(c) is contingent on your ongoing compliance with the Applicable Restrictive Covenants for the duration of the Restricted Vesting Period regardless of the length of the protected period or similar restrictive covenant period which you are required to comply under an Employment Agreement, award agreement or other agreement you have with the Company.

For purposes of this Agreement, “Applicable Restrictive Covenant” includes any restrictive covenant provision (including, but not limited to a non-competition, non-solicitation and/or confidentiality restriction) applicable you under an Employment Agreement, award agreement or other agreement you have with the Company.

7. You acknowledge that as a condition to accepting payment of your Deferred Cash Award, you may be required to certify to the Company, in the form and manner determined by the Company in its sole discretion, that you have complied with all terms and conditions of this Agreement, including the Applicable Restrictive Covenants. You understand and agree that:

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(a) if the Company determines, in its sole discretion, that you have failed to comply with all terms and conditions of this Agreement, all of your rights to your Deferred Cash Award will terminate and your Deferred Cash Award will be cancelled without any payment to you; and

(b) (i) your address on file with the Company at the time any certification is required will be deemed to be your current address, (ii) it is your responsibility to inform the Company of any changes to your address to ensure timely receipt of the certification materials, (iii) you are responsible for contacting the Company to obtain such certification materials if not received and (iv) your failure to return properly completed certification materials by the specified deadline (which includes your failure to timely return the completed certification because you did not provide the Company with updated contact information) will result in the cancellation of your Deferred Cash Award without any payment to you. For the avoidance of doubt, references in this Section 7(b) to your address are inclusive of your email address and references to your receipt and return of certification materials are inclusive of such actions taken by means of electronic communication.

8. If at any time within two (2) years after a Vesting Date (a “realization event”), you (a) are terminated for Cause, (b) engage in or have engaged in any activity that is a violation of an Applicable Restrictive Covenant during the protected period or similar restrictive covenant period, (c) violate or have violated any confidentiality or proprietary information obligation you owe to the Company (including, but not limited to, the confidentiality or proprietary information obligations in any non-compete agreement, Employment Agreement, employee handbook, non-disclosure agreement, Code of Business Conduct or Ethics, equity award agreement or any other agreement signed by you that contains such obligations), and/or (d) engage in or have engaged in any act of fraud against the Company, then you hereby agree that the amount of the Deferred Cash Award that became vested at the realization event shall be paid by you to the Company upon notice from the Company (the “Repayment Amount”). The Repayment Amount shall be determined on a gross basis, without reduction for any taxes incurred, as of the date of the realization event. The Company shall have the right to offset the Repayment Amount against any amounts otherwise owed to you by the Company (whether as wages, vacation pay or pursuant to any benefit plan or other compensatory arrangement) to the extent permissible under applicable law, including Section 409A. Additionally, the Deferred Cash Award is subject to the Company’s Compensation Recoupment Policy, if applicable to you, which can cause the forfeiture of the Deferred Cash Award.

9. Without limiting the application of Sections 12 and 13, in the event of a Change-In-Control the Committee reserves the right, in its sole discretion, to accelerate the vesting of the Deferred Cash Award, but shall have no obligation to take any such action. In the absence of any such action under this Section 9, the Deferred Cash Award shall continue in effect in accordance with its terms. Notwithstanding anything to the contrary in Section 5, in the event that you cease to be an Employee (including by reason of the Company’s sale or divestiture of a business unit or otherwise where such transaction is not a Change-In-Control), the Committee shall, in its sole discretion, have the authority to provide that (A) the vesting restrictions applicable to any unvested portion of your Deferred Cash Award shall lapse upon the effective time of completion of such sale or divestiture or (B) (i) any unvested portion of your Deferred Cash Award not be forfeited upon such termination and (ii) you continue to vest in the Deferred Cash Award in

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accordance with the Vesting Dates set forth above, subject to satisfaction of any other vesting conditions the Committee deems reasonable and appropriate (including, without limitation, your continued employment with a third party following a sale or divestiture by the Company of a business unit or otherwise).

10. Tax Liabilities

(a) For the purposes of this Section 10, “Taxable Event” shall mean any event or circumstance that gives rise to a liability of or for the Grantee to pay income tax and National Insurance Contributions (“NICs”) or either of them (or their equivalents in any jurisdiction) in respect of or in connection with: (i) this Agreement, including the vesting of, or lapse of restrictions on, or payment of, any or all of the Deferred Cash Award, its assignment or surrender for consideration, or the receipt of any benefit in connection with it; (ii) any cash or other assets earmarked or held to satisfy this Agreement; and (iii) any amount due under PAYE in respect of events within (i) to (ii) above including any failure by you to make good such an amount within the time limit specified in section 222 of the Income Tax (Earnings and Pensions) Act 2003.

(b) For the purposes of this Section 10, “Tax Liability” shall mean the total of any income tax and primary class 1 (employee) NICs (or their equivalents in any jurisdiction) that your employer (or former employer) is liable to account for (or reasonably believes it is liable to account for) as a result of any Taxable Event.

(c) You agree that the Company may deduct and withhold an amount equal to any Tax Liability or any part of it from all amounts paid in respect of or in connection with the Deferred Cash Award upon the vesting of, or lapse of restrictions on, or payment of, any or all of the Deferred Cash Award.

(d) You irrevocably agree to (i) pay to the Company (on behalf of your employer or former employer) the amount of any Tax Liability or (ii) enter into arrangements to the satisfaction of Company for payment of any Tax Liability, in each case to the extent that insufficient amounts have been withheld under Section 10(c).

(e) You also agree that the Company (or your employer or former employer) may withhold an amount equal to any Tax Liability or any part of it from any other amounts payable to you (whether wages, vacation pay or pursuant to any benefit plan or other compensatory arrangement), in each case if for any reason insufficient amounts are withheld under Section 10(c) and you do not fulfil you obligations under Section 10(d) above within a reasonable period (as determined by the Committee in its absolute discretion) after the relevant Tax Liability has arisen.

11. Except with the consent of the Committee, you may not sell, pledge, hypothecate, assign, transfer or otherwise encumber the Deferred Cash Award, other than by will or the laws of descent and distribution. This prohibition includes any assignment or other transfer that purports to occur by operation of law or otherwise. During your lifetime, payments relating to the Deferred Cash Award will be made only to you and any attempt to sell, pledge, hypothecate, assign, transfer or otherwise encumber the Deferred Cash Award shall be void.

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12. All matters with respect to the Deferred Cash Award will be determined by the Committee or its designee. The Committee has the authority and discretion to select those persons who shall receive Deferred Cash Awards, to determine the time or times of receipt, to establish the terms, conditions, performance criteria, restrictions or other provisions of the Deferred Cash Awards, and, subject to the restrictions of Section 14, to modify, amend or terminate the Deferred Cash Awards. The Committee’s determinations regarding Deferred Cash Awards (including, without limitation, the amount and timing of such awards, the terms and provision of such awards and the agreements evidencing the same) need not be uniform and may be made by it selectively among individuals who receive, or are eligible to receive Deferred Cash Awards. Except to the extent prohibited by applicable law, the Committee may delegate to any person or persons all or any part of its responsibilities and powers as set forth in this Agreement, and may revoke such delegation at any time.

13. The Committee is authorized to establish, amend and rescind such rules and regulations as it deems necessary or advisable for the proper administration of Deferred Cash Awards and to take such other action in connection with or in relation to such Deferred Cash Awards as it deems necessary or advisable. Each action and determination made by the Committee with respect to the Deferred Cash Award will be final and conclusive. No employee of the Company or any member of the Board will be personally liable for any action, determination or interpretation made in good faith with respect to this Agreement or the Deferred Cash Award granted hereto.

14. The Committee may at any time terminate, modify or amend the Deferred Cash Award in such respects as it shall deem advisable; provided, however; that no termination, modification or amendment of any outstanding Deferred Cash Award may, without your consent, adversely affect your rights with respect to the outstanding Deferred Cash Award.

15. This Agreement does not constitute a contract of employment, nor does it give you the right to be retained in the employ of the Company or any Affiliate, or the right to continue to provide services to the Company or any Affiliate, in each case, for any particular period or on any particular basis of compensation. Nothing contained in this Agreement, and no action of the Company or the Committee with respect to this Agreement, will interfere in any way with the right of the Company or an Affiliate to terminate your employment at any time, for any reason or for no reason.

16. By executing this Agreement and acknowledging the terms and conditions set forth herein, you will be deemed to have agreed that this Deferred Cash Award is special incentive compensation that will not be taken into account, in any manner, as salary, compensation or bonus in determining the amount of any payment under any health and welfare, pension, retirement or other employee benefit plan, program or policy of the Company or any Affiliate.

17. You will not, by reason of this Agreement, acquire any right in or title to any assets, funds or property of the Company or any Affiliate, including, without limitation, any specific funds, assets or other property which the Company or any Affiliate in its sole discretion may set aside in anticipation of a liability under this Agreement. You will only have a contractual right to the amounts, if any, payable under this Agreement, unsecured by any assets of the Company or any Affiliate, and nothing contained in this Agreement shall constitute a guarantee that the assets of the Company or any Affiliate shall be sufficient to pay any benefits to any person.

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18. The Company and you hereby irrevocably submit to the exclusive jurisdiction of any state or federal court of appropriate jurisdiction located in New York, New York over any suit, action or proceeding arising out of or relating to or concerning this Agreement that is not otherwise arbitrated or resolved according to Section 19.

(a) The Company and you acknowledge that the forum designated by this section has a reasonable relation to this Agreement and to the relationship between the Company and you. Notwithstanding the foregoing, nothing herein shall preclude the Company from bringing any action or proceeding in any other court for the purpose of enforcing the provisions of this section.

(b) The agreement by the Company and you as to forum is independent of the law that may be applied in the action, and the Company and you (i) agree to such forum even if the forum may under applicable law choose to apply non-forum law, (ii) hereby waive, to the fullest extent permitted by applicable law, any objection which the Company or you now or hereafter may have to personal jurisdiction or to the laying of venue of any such suit, action or proceeding in any court referred to in this section, (iii) undertake not to commence any suit, action or proceeding arising out of or relating to or concerning this Agreement in any forum other than the forum described in this section, and (iv) agree that, to the fullest extent permitted by applicable law, a final and non-appealable judgment in any such suit, action or proceeding in any such court shall be conclusive and binding upon the Company and you.

(c) You hereby irrevocably appoint the General Counsel of the Company as your agent for service of process in connection with any action, suit or proceeding arising out of or relating to or concerning this Agreement that is not otherwise arbitrated or resolved according to Section 19.

(d) You agree to keep confidential the existence of, and any information concerning, a dispute, controversy or claim described in this section, except that you may disclose information concerning such dispute, controversy or claim to the arbitrator or court that is considering such dispute, controversy or claim or to your legal counsel (provided that such counsel agrees not to disclose any such information except as necessary to the prosecution or defense of the dispute, controversy or claim).

19. Subject to the provisions of Section 18 above, any dispute, controversy or claim between the Company and you, arising out of or relating to or concerning this Agreement will be finally settled by binding arbitration in New York, New York before, and in accordance with the rules then obtaining of, the Financial Industry Regulatory Authority (“FINRA”) or, if FINRA declines to arbitrate the matter (or if the matter otherwise is not arbitrable by it), the American Arbitration Association (the “AAA”) in accordance with the commercial arbitration rules of the AAA. Prior to arbitration, all claims maintained by you must first be submitted to the Committee in accordance with claims procedures determined by the Committee.

20. If you attempt to have any dispute that arises out of or relates to this Agreement resolved in any manner that is not provided for by Sections 18 and 19 above, then (i) any outstanding portion of the Deferred Cash Award (whether vested or unvested) shall be forfeited and (ii) any amounts paid in respect of the Deferred Cash Award shall be repaid by you to the Company upon notice from the Company in the manner set forth in Section 8.

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21. The obligation of the Company to make payments in respect of the Deferred Cash Award granted under this Agreement is specifically subject to all provisions of this Agreement, and all applicable laws, rules, regulations and governmental approvals.

22. The grant of the Deferred Cash Award is not enforceable until this Agreement has been signed by the Company and acknowledged by you. By acknowledging this Agreement, you shall be deemed to have accepted and consented to any action taken under this Agreement by the Committee, the Board or any of their delegates.

23. No change or modification of this Agreement shall be valid unless it is in writing and signed by the parties hereto.

24. Any notice by you to the Company hereunder shall be in writing and shall be deemed duly given only upon receipt thereof by the Company at its principal offices. Any notice by the Company to you shall be in writing and shall be deemed duly given if mailed to you at the address on file with the Company.

25. The grant of Deferred Cash Awards shall not be construed as creating any limitations on the power of the Board to adopt such other incentive arrangements as it may deem advisable, and such arrangements may be either generally applicable or applicable only in specific cases.

26. The validity and construction of this Agreement shall be governed by the laws of the State of Delaware, without regard to the conflicts of law principles thereof.

27. This Agreement sets forth all of the promises, agreements, conditions, understandings, warranties and representations between the parties hereto regarding the Deferred Cash Award, and there are no promises, agreements, conditions, understandings, warranties or representations, oral or written, express or implied, between them regarding the Deferred Cash Award other than as set forth herein or therein.

28. The provisions of this Section 28 apply to only those Grantees who are U.S. taxpayers. The intent of the parties is that payments and benefits under this Agreement comply with Section 409A to the extent subject thereto, and, accordingly, to the maximum extent permitted, this Agreement shall be interpreted and be administered consistent with such intent. Notwithstanding anything contained herein to the contrary, to the extent required in order to avoid accelerated taxation and/or tax penalties under Section 409A, you shall not be considered to have terminated employment with the Company for purposes of this Agreement and no payment shall be due to you under Section 5(a) of this Agreement until you would be considered to have incurred a “separation from service” from the Company within the meaning of Section 409A. Any payments that are due within the “short term deferral period” as defined in Section 409A shall not be treated as deferred compensation unless applicable law requires otherwise. Notwithstanding anything to the contrary in this Agreement, to the extent that any amounts are payable upon a “separation from service” and such payment would result in the imposition of any additional tax and penalties imposed under Section 409A, the payment of such amounts shall instead be made on the first business day after the date that is six (6) months following such separation from service (or death, if earlier) to the extent any such delay would avoid the imposition of such tax or penalty. In addition, each amount to be paid or benefit to be provided to you pursuant to this Agreement, which constitutes deferred compensation subject to Section 409A, shall be construed as a separate identified payment for purposes of Section 409A.

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29. As used in this Agreement, “the Company” shall mean the Company as hereinbefore defined and any successor to its business and/or assets, whether direct or indirect, by purchase, merger, consolidation, the transfer of property, stock or goodwill or otherwise. This Agreement shall automatically inure to the benefit of, and be enforceable by the Company, including its successors, and assigns, without the need for any further action or approval by you. You specifically agree that this Agreement may be assigned by the Company and enforced by any assignee or successor of the Company.

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By acknowledging this Agreement in a method to be determined by the Company, you accept and agree to all of the foregoing terms and provisions and to all of the terms and provisions. The provisions in this Agreement (including, without limitation, the Applicable Restrictive Covenants) shall not supersede, modify, replace or cancel any existing contractual obligations, including but not limited to restrictive covenants, applicable you in any Employment Agreement, prior equity award agreements or other agreement with the Company.

IN WITNESS WHEREOF, the Company has caused this Agreement to be executed by a duly authorized representative as of the Grant Date.

KCG HOLDINGS, INC.

By: /s/ DANIEL COLEMAN

Daniel B. Coleman

Chief Executive Officer

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Annex A: Definitions

“Affiliate” means any corporation, partnership, joint venture or other entity during any period in which at least a twenty-five percent voting or profits interest is owned, directly or indirectly, by the Company (or by any entity that is a successor to the Company), and any other business venture designated by the Committee in which the Company (or any entity that is a successor to the Company) has a significant interest, as determined in the discretion of the Committee.

“Cause” means summary termination of the Grantee’s employment for gross misconduct (as defined in any Employment Agreement or other applicable governing Company document) or for a fundamental breach of the Employment Agreement without notice or payment in lieu of notice pursuant to the contract of employment.

“Change-In-Control” means the first to occur of:

i. the acquisition by any “person” (as such term is used in Sections 13(d) and 14(d) of the Securities Exchange Act of 1934, as amended from time to time (the “Exchange Act”)) of “beneficial ownership” (within the meaning of Rule 13d-3 of the Exchange Act), directly or indirectly, of securities of the Company representing thirty-five percent or more of either the then outstanding Shares or the combined voting power of the Company’s then outstanding voting securities entitled to vote generally in the election of directors; provided, however, that for purposes of this subsection (i), the following transactions shall not constitute a Change-In-Control: (A) an acquisition by the Company, (B) an acquisition by any employee benefit plan (or related trust) sponsored or maintained by the Company, (C) an acquisition by an entity owned, directly or indirectly, by the stockholders of the Company in substantially the same proportions as their ownership of Shares, (D) an acquisition by an entity pursuant to a Business Combination (as defined below in subsection) that satisfies clauses (A), (B) and (C) of such subsection or (E) any acquisition directly from the Company;

ii. the following individuals cease for any reason to constitute a majority of the Company’s Directors then serving: individuals who as of the date hereof constitute the Board (the “Initial Directors”) and any new Director (a “New Director”) whose appointment or election by the Board or nomination for election by the Company’s stockholders was approved or recommended by a vote of at least two-thirds of the Directors then in office who either are Initial Directors or New Directors; provided, however, that a Director 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 Company shall not be considered a New Director;

iii. the occurrence or consummation of a reorganization, merger or consolidation or a sale or disposition of all or substantially all of the Company’s assets (a “Business Combination”), other than a Business Combination in which (A) the voting securities of the Company outstanding immediately prior thereto and entitled to vote generally in the election of directors continue to represent (either by remaining outstanding or by being converted into voting securities of the surviving entity or any parent thereof) more than fifty percent of the combined voting power of the voting securities of the Company or such surviving entity or parent outstanding immediately after such Business Combination and entitled to vote generally in the election of directors; (B) no “person” (as hereinabove defined), other than the Company, an employee benefit plan (or related trust) sponsored or maintained by the Company, or an entity resulting from such Business Combination, acquires more than thirty-five percent of the combined voting power of the Company’s then outstanding securities entitled to vote generally in the election of directors, and (C) at least a majority of the members of the board of directors of the entity resulting from such Business Combination were Initial Directors or New Directors at the time of the execution of the initial agreement, or action of the Board, providing for such Business Combination; or

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iv. the stockholders of the Company approve a plan of complete liquidation or dissolution of the Company.

“Code” means the Internal Revenue Code of 1986, as amended from time to time, or any successor statute or statutes thereto, and any rules or regulations promulgated thereunder.

“Director” means a duly elected member of the Board.

“Disability” means that the Grantee is unable to engage in any substantial gainful activity by reason of any medically determinable physical or mental impairment that can be expected to result in death or can be expected to last for a continuous period of not less than 12 months.

“Employee” means a common law employee (as defined in Section 3401(c) of the Code) of the Company or any Affiliate of the Company. The term “Employee” will also include an individual who is granted an Deferred Cash Award, in connection with his hiring by the Company or any Affiliate, prior to the date the individual first becomes an Employee, but if and only if such Deferred Cash Award does not vest prior to the date the individual first becomes an Employee.

“Employment Agreement” means the Grantee’s contract of employment with the Company or any Affiliate of the Company (including, for the avoidance of doubt, any such contract in the form of an offer letter or otherwise), outlining the terms and conditions of Grantee’s employment with a Group Company (as such contract of employment may be amended from time to time) as of the date of this Agreement.

“Group Company” means KCG Europe Limited (“KCGE”) and any (i) holding company of KCGE, (ii) subsidiary undertaking of KCGE and (iii) subsidiary undertaking of any such holding company (as defined in the Companies Act 2006) including, but not limited to Knight Capital (Europe) Limited and Getco Europe Limited.

“Section 409A” means Section 409A of the Code.

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EX-31.1

EXHIBIT 31.1

CERTIFICATIONS

I, Daniel Coleman, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q for the quarter ended March 31, 2017 of KCG Holdings, Inc.;

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 controls 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 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.

/S/    DANIEL COLEMAN

Name: Daniel Coleman

Title:     Chief Executive Officer

             (Principal Executive Officer)

Date: May 8, 2017

EX-31.2

EXHIBIT 31.2

CERTIFICATIONS

I, Steffen Parratt, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q for the quarter ended March 31, 2017 of KCG Holdings, Inc.;

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 controls 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 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.

/S/    STEFFEN PARRATT

Name: Steffen Parratt

Title:     Chief Financial Officer

             (Principal Financial Officer)

Date: May 8, 2017

EX-32.1

EXHIBIT 32.1

Statement of Chief Executive Officer 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 Quarterly Report on Form 10-Q of KCG Holdings, Inc. (the “Company”) for the quarter ended March 31, 2017 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Daniel Coleman, as Chief Executive Officer of the Company, hereby certifies, pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of his knowledge:

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 Company.

	/S/    DANIEL COLEMAN
Name: Title:	Daniel Coleman Chief Executive Officer
Date:	May 8, 2017

This certification accompanies the Report pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, and shall not, except to the extent required by the Sarbanes-Oxley Act of 2002, be deemed filed by the Company for purposes of Section 18 of the Securities Exchange Act of 1934, as amended.

EX-32.2

EXHIBIT 32.2

Statement of Chief Financial Officer 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 Quarterly Report on Form 10-Q of KCG Holdings, Inc. (the “Company”) for the quarter ended March 31, 2017 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Steffen Parratt as Chief Financial Officer of the Company, hereby certifies, pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of his knowledge:

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 Company.

	/S/    STEFFEN PARRATT
Name: Title:	Steffen Parratt Chief Financial Officer
Date:	May 8, 2017

This certification accompanies the Report pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, and shall not, except to the extent required by the Sarbanes-Oxley Act of 2002, be deemed filed by the Company for purposes of Section 18 of the Securities Exchange Act of 1934, as amended.

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Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2017	May 04, 2017
Document And Entity Information [Abstract]
Entity Registrant Name	KCG HOLDINGS, INC.
Entity Central Index Key	0001569391
Document Type	10-Q
Document Period End Date	Mar. 31, 2017
Amendment Flag	false
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Common Class A
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		67,630,780
Common Class B
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		0

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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues
Trading revenues, net	$ 154,307	$ 223,938
Commissions and fees	93,589	106,101
Interest, net	821	117
Investment income and other, net	6,656	15,268
Total revenues	255,373	345,424
Expenses
Employee compensation and benefits	66,003	97,586
Execution and clearance fees	72,795	73,634
Communications and data processing	39,020	35,657
Depreciation and amortization	19,038	21,905
Payments for order flow	17,121	12,655
Collateralized financing interest	11,761	9,163
Debt interest expense	9,330	9,492
Occupancy and equipment rentals	6,760	8,990
Professional fees	4,544	6,057
Business development	1,208	1,119
Other	8,197	9,201
Total expenses	255,777	285,459
(Loss) income before income taxes	(404)	59,965
Income tax (benefit) expense	(3,616)	22,800
Net income	$ 3,212	$ 37,165
Basic earnings per share (in dollars per share)	$ 0.05	$ 0.42
Diluted earnings per share (in dollars per share)	$ 0.05	$ 0.41
Shares used in computation of basic earnings per share	66,306	88,458
Shares used in computation of diluted earnings per share	67,642	89,605

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 3,212	$ 37,165
Other comprehensive income (loss):
Unrealized gain on available for sale securities, net of tax	170	68
Reclassification of realized gain from Other comprehensive income, net of tax	(2,956)	0
Cumulative translation adjustment, net of tax	437	(133)
Comprehensive income	$ 863	$ 37,100

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CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Assets
Cash and cash equivalents	$ 669,869	$ 632,234
Cash and cash equivalents segregated under federal and other regulations	3,600	3,000
Financial instruments owned, at fair value, including securities pledged to counterparties that had the right to deliver or repledge of $368,736 at March 31, 2017 and $314,720 at December 31, 2016:
Equities	2,179,211	2,343,033
Debt securities	128,932	177,698
Listed options	12,299	19,100
Other financial instruments	0	30
Total financial instruments owned, at fair value	2,320,442	2,539,861
Collateralized agreements:
Securities borrowed	1,594,442	1,688,222
Receivable from brokers, dealers and clearing organizations	801,678	832,785
Fixed assets and leasehold improvements, less accumulated depreciation and amortization	159,595	151,645
Investments	24,716	30,979
Goodwill and Intangible assets, less accumulated amortization	106,851	100,338
Deferred tax asset, net	109,877	109,861
Assets of business held for sale	0	8,194
Other assets	192,359	164,168
Total assets	5,983,429	6,261,287
Financial instruments sold, not yet purchased, at fair value:
Equities	1,694,374	1,821,957
Debt securities	177,168	211,222
Listed options	35,835	12,961
Other financial instruments	598	0
Total financial instruments sold, not yet purchased, at fair value	1,907,975	2,046,140
Collateralized financings:
Securities loaned	459,533	372,631
Financial instruments sold under agreements to repurchase	952,584	1,027,775
Other collateralized financings	50,000	100,000
Total collateralized financings	1,462,117	1,500,406
Payable to brokers, dealers and clearing organizations	495,253	518,900
Payable to customers	52,315	23,580
Accrued compensation expense	36,695	132,406
Accrued expenses and other liabilities	163,343	156,828
Income taxes payable	63,236	71,391
Debt	455,183	454,353
Total liabilities	4,636,117	4,904,004
Class A Common Stock
Shares authorized: 1,000,000 at March 31, 2017 and December 31, 2016; Shares issued: 91,810 at March 31, 2017 and 90,309 at December 31, 2016; Shares outstanding: 66,665 at March 31, 2017 and 67,192 at December 31, 2016	918	903
Additional paid-in capital	1,457,412	1,439,412
Retained earnings	195,276	192,064
Treasury stock, at cost; 25,145 shares at March 31, 2017 and 23,116 shares at December 31, 2016	(306,192)	(277,343)
Accumulated other comprehensive (loss) income	(102)	2,247
Total equity	1,347,312	1,357,283
Total liabilities and equity	$ 5,983,429	$ 6,261,287

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CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Financial instruments owned, at fair value, securities pledged	$ 368,736	$ 314,720
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	91,810,000	90,309,000
Common stock, shares outstanding	66,665,000	67,192,000
Treasury stock, shares	25,145,000	23,116,000

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CONSOLIDATED STATEMENT OF CHANGES IN EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Class A Common Stock	Common Stock Class A Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Accumulated other comprehensive (loss) income
Beginning balance at Dec. 31, 2015							$ 350
Increase (Decrease) in Stockholders' Equity [Roll Forward]
KCG Class A Common Stock repurchased (in shares)		(1,800)
KCG Class A Common Stock repurchased		$ (20,500)
Unrealized gain on available for sale securities, net of tax	$ 68
Reclassification of realized gain from Other comprehensive income, net of tax	0
Cumulative translation adjustment, net of tax	(133)
Net income	37,165
Ending balance at Mar. 31, 2016							285
Beginning balance (in shares) at Dec. 31, 2016			90,309
Beginning balance at Dec. 31, 2016	$ 1,357,283		$ 903	$ 1,439,412	$ 192,064		2,247
Beginning balance (in shares) at Dec. 31, 2016	(23,116)					(23,116)
Beginning balance at Dec. 31, 2016	$ (277,343)					$ (277,343)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
KCG Class A Common Stock repurchased (in shares)		(900)				(2,029)
KCG Class A Common Stock repurchased	(28,849)	$ (13,300)				$ (28,849)
Stock-based compensation and Options & Warrants exercised (in shares)			1,501
Stock-based compensation and Options & Warrants exercised	18,015		$ 15	18,000
Unrealized gain on available for sale securities, net of tax	170						170
Reclassification of realized gain from Other comprehensive income, net of tax	(2,956)						(2,956)
Cumulative translation adjustment, net of tax	437						437
Net income	3,212				3,212
Ending balance (in shares) at Mar. 31, 2017			91,810
Ending balance at Mar. 31, 2017	$ 1,347,312		$ 918	$ 1,457,412	$ 195,276		$ (102)
Ending balance (in shares) at Mar. 31, 2017	(25,145)					(25,145)
Ending balance at Mar. 31, 2017	$ (306,192)					$ (306,192)

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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities
Net income	$ 3,212	$ 37,165
Adjustments to reconcile Net income to net cash provided by operating activities
Depreciation and amortization	19,038	21,905
Stock and unit-based compensation	2,997	17,110
Realized gain on sale of assets and investments	(4,834)	(2,798)
Realized gain on repurchase of debt	0	(3,676)
Unrealized gain on investments	(117)	(4,847)
Other	618	2,750
(Increase) decrease in operating assets
Cash and cash equivalents segregated under federal and other regulations	(600)	0
Financial instruments owned, at fair value	219,419	(92,151)
Securities borrowed	93,780	(45,605)
Receivable from brokers, dealers and clearing organizations	31,107	25,130
Other assets	(34,821)	13,150
Increase (decrease) in operating liabilities
Financial instruments sold, not yet purchased, at fair value	(138,165)	(57,943)
Securities loaned	86,901	63,981
Financial instruments sold under agreements to repurchase	(75,191)	(45,599)
Other collateralized financing	(50,000)	0
Payable to brokers, dealers and clearing organizations	(23,648)	300,855
Payable to customers	28,735	(5,747)
Accrued compensation expense	(77,207)	(81,994)
Accrued expenses and other liabilities	276	(9,357)
Income taxes payable	(8,155)	0
Net cash provided by operating activities	73,345	132,329
Cash flows from investing activities
Cash received from sale of KCG Hotspot	6,492	6,552
Cash received from sale of assets	0	4,970
Cash received from sale of investments and redemptions from investments	7,404	6,534
Purchases of fixed assets and leasehold improvements	(21,776)	(12,677)
Capitalization of software development costs	(17,725)	(9,013)
Purchases of investments	(869)	(770)
Net cash used in investing activities	(26,474)	(4,404)
Cash flows from financing activities
Repurchase of 6.875% Senior Secured Notes	0	(30,288)
Borrowings under capital lease obligations	12,257	0
Principal payments on capital lease obligations	(568)	(507)
Cost of common stock repurchased	(28,849)	(30,667)
Stock options exercised	2,775	0
Warrants exercised	4,144	0
Cost of warrants repurchased	0	(967)
Net cash used in financing activities	(10,241)	(62,429)
Effect of exchange rate changes on cash and cash equivalents	1,005	261
Increase in cash and cash equivalents	37,635	65,757
Cash and cash equivalents at beginning of period	632,234	581,313
Cash and cash equivalents at end of period	669,869	647,070
Supplemental disclosure of cash flow information:
Cash paid for interest	31,891	27,884
Cash paid for income taxes	1,535	9,955
Non-cash investing activities - Compensation capitalized for internal use software that will be paid in a subsequent period	186	0
Non-cash investing activities - Compensation capitalized for internal use software that will be paid in a subsequent period	1,762	0
Non-cash financing activities - Warrants repurchased via GA Swap	$ 2,929	$ 0

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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical)	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Mar. 10, 2015
Senior Secured Notes | 6.875% Senior Secured Notes
Interest rate (percent)	6.875%	6.875%	6.875%	6.875%

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Organization and Description of the Business

3 Months Ended

Mar. 31, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization and Description of the Business

Organization and Description of the Business

KCG Holdings, Inc. (collectively with its subsidiaries, "KCG" or the "Company") is a leading independent securities firm offering clients a range of services designed to address trading needs across asset classes, product types and time zones. The Company combines advanced technology with specialized client service across market making, agency execution and trading venues and also engages in principal trading via exchange-based electronic market making. KCG has multiple access points to trade global equities, options, fixed income, currencies and commodities via voice or automated execution.

KCG was formed as a result of a strategic business combination (the “2013 Mergers”) of Knight Capital Group, Inc.(“Knight”) and GETCO Holding Company, LLC (“GETCO”) in July 2013.

Pending Merger with Virtu

On April 20, 2017, the Company entered into an Agreement and Plan of Merger (the “Merger Agreement”) with Virtu Financial, Inc., a Delaware corporation (“Virtu”) and Orchestra Merger Sub, Inc., a Delaware corporation and indirect wholly owned subsidiary of Virtu (“Merger Sub”). The Merger Agreement provides for the merger of Merger Sub with and into the Company (the “Merger”), with the Company surviving the Merger as a wholly owned subsidiary of Virtu.

Pursuant to the Merger Agreement, at the effective time of the Merger (the “Effective Time”), each share of Class A common stock of the Company, par value $0.01 per share ("KCG Class A Common Stock"), issued and outstanding immediately prior to the Effective Time (other than (i) Shares owned by Virtu, Merger Sub, any affiliate of Virtu or Merger Sub, or the Company, in each case immediately prior to the Effective Time, and (ii) Shares held by stockholders who have not voted in favor of the Merger and who have properly and validly perfected their statutory rights of appraisal in respect of such Shares in accordance with Section 262 of the Delaware General Corporation Law) will be canceled and converted into the right to receive $20.00 in cash without interest (the “Merger Consideration”), subject to applicable tax withholding. In accordance with the Merger Agreement, all unvested stock-based compensation awards that are outstanding as of immediately prior to the Effective Time shall accelerate and become fully vested and exercisable effective immediately prior to, and contingent upon, the Effective Time.

The respective obligations of the Company, Virtu and Merger Sub to consummate the Merger are subject to the satisfaction or waiver of certain customary conditions, including the adoption of the Merger Agreement by the Company’s stockholders, the receipt of certain required governmental approvals, the absence of any legal prohibitions, the accuracy of the representations and warranties (subject to customary materiality qualifiers) and compliance by the other party with its obligations under the Merger Agreement (subject to customary materiality qualifiers). The consummation of the Merger is not subject to a financing condition.

Concurrently with the execution of the Merger Agreement, Virtu entered into a voting agreement with Jefferies LLC (“Jefferies”), a stockholder of the Company, which requires Jefferies to, among other things, vote all of its shares of KCG Class A Common Stock in favor of adoption of the Merger Agreement.

The Company expects the Merger to close in the third quarter of 2017.

As of March 31, 2017, the Company's operating segments comprised the following: (i) Market Making; (ii) Global Execution Services; and (iii) Corporate and Other.

Market Making

The Market Making segment principally consists of market making in the cash, futures and options markets across global equities, options, fixed income, currencies and commodities. As a market maker, the Company commits capital on a principal basis by offering to buy securities from, or sell securities to, broker dealers, banks and institutions. The Company engages in principal trading in the Market Making segment direct to clients as well as in a supplemental capacity on exchanges, electronic communications networks (“ECNs”) and alternative trading systems (“ATSs”). The Company is an active participant on all major global equity and futures exchanges and also trades on substantially all domestic electronic options exchanges. As a complement to electronic market making, the cash trading business handles specialized orders and also transacts on the OTC Bulletin Board marketplaces operated by the OTC Markets Group Inc. and the Alternative Investment Market of the London Stock Exchange ("AIM").

Global Execution Services

The Global Execution Services segment comprises agency-based trading and trading venues, offering execution services in global equities, options, futures and fixed income on behalf of institutions, banks and broker dealers. The Company earns commissions as an agent on behalf of clients as well as between principals to transactions; in addition, the Company will commit capital on behalf of clients as needed. Agency-based, execution-only trading in the segment is done primarily through a variety of access points including: (i) algorithmic trading and order routing in global equities and options; (ii) institutional sales traders executing program, block and riskless principal trades in global equities and exchange traded funds ("ETFs"); (iii) a fixed income ECN that also offers trading applications; and (iv) an ATS for U.S. equities.

In September 2016, the Company completed the acquisition of Neonet Securities AB ("Neonet"). Neonet is an independent agency broker and execution specialist based in Stockholm, Sweden. The results of Neonet, beginning on the date of acquisition, are included in this segment. The Company does not consider this acquisition to be significant.

Corporate and Other

The Corporate and Other segment contains the Company's investments, principally in strategic trading-related opportunities; manages the deployment of capital across the organization; houses executive management functions; and maintains corporate overhead expenses and all other income and expenses that are not attributable to the Company's other segments. The Corporate and Other segment also contains functions that support the Company’s other segments such as self-clearing services, including stock lending activities.

Sales of Businesses

In March 2016, KCG completed the sale of assets related to its retail U.S. options market making business.

In May 2016, KCG completed the sale of its business as an equities designated market maker ("DMM") on the New York Stock Exchange ("NYSE") to Citadel Securities LLC (“Citadel”).

The results of both the retail U.S. options market making business and the DMM business are included in the Market Making segment, up through the date of the respective sales.

See Footnote 3 "Assets of Businesses Held for Sale & Sales of Businesses" for further information.

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Significant Accounting Policies

3 Months Ended

Mar. 31, 2017

Accounting Policies [Abstract]

Significant Accounting Policies

Significant Accounting Policies

Basis of consolidation and form of presentation

The accompanying unaudited Consolidated Financial Statements, prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”), should be read in conjunction with the audited Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016. These unaudited Consolidated Financial Statements include the accounts of the Company and its subsidiaries and reflect all normal and recurring adjustments that are, in the opinion of management, necessary for a fair statement of the results for the interim periods presented. Certain footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to U.S. Securities and Exchange Commission (“SEC”) rules and regulations, although the Company believes that the disclosures herein are adequate to make the information presented not misleading. All significant intercompany transactions and balances have been eliminated. Interim period operating results may not be indicative of the operating results for a full year.

Cash and cash equivalents

Cash and cash equivalents include money market accounts, which are payable on demand, and short-term investments with an original maturity of less than 90 days. The carrying amount of such cash equivalents approximates their fair value due to the short-term nature of these instruments. These assets would be categorized as Level 1 in the fair value hierarchy if they were required to be recorded at fair value.

Cash and cash equivalents segregated under federal and other regulations

The Company maintains custody of customer funds and is obligated by rules and regulations mandated bythe SEC to segregate or set aside cash and/or qualified securities to satisfy these regulations, which have been promulgated to protect customer assets. The amounts recognized as Cash and cash equivalents segregated under federal and other regulations approximate fair value. These assets would be categorized as Level 1 in the fair value hierarchy if they were required to be recorded at fair value.

Market making, sales, trading and execution activities

Financial instruments owned and Financial instruments sold, not yet purchased relate to market making and trading activities, and include listed and other equity securities, listed equity options and fixed income securities that are recorded on a trade date basis and are reported at fair value. Such financial instruments are netted by their respective long and short positions by CUSIP/ISIN number. Trading revenues, net, which comprises trading gains, net of trading losses on such financial instruments, are also recorded on a trade date basis.

Commissions, which primarily comprise commission equivalents earned on institutional client orders and volume based fees earned from providing liquidity to other trading venues, as well as related expenses, are also recorded on a trade date basis.

The Company’s third party clearing agreements call for payment or receipt of interest income, net of transaction-related interest charged by such clearing brokers, for facilitating the settlement and financing of securities transactions. Interest income and interest expense which have been netted within Interest, net on the Consolidated Statements of Operations are as follows (in thousands):

	For the three months ended March 31,
	2017			2016
Interest Income	$	3,978		$	3,107
Interest Expense	(3,157		)	(2,990		)
Interest, net	$	821		$	117

Dividend income relating to financial instruments owned and dividend expense relating to financial instruments sold, not yet purchased, are derived primarily from the Company’s market making activities and are included as a component of Trading revenues, net on the Consolidated Statements of Operations. Trading revenues, net includes dividend income and expense as follows (in thousands):

	For the three months ended March 31,
	2017			2016
Dividend Income	$	10,360		$	11,921
Dividend Expense	$	(9,329	)	$	(9,148	)

Payments for order flow represent payments to broker dealer clients, in the normal course of business, for directing their order flow in U.S. equities and, prior to the sale of the retail U.S. options market making business, options to the Company.

Fair value of financial instruments

The Company values its financial instruments using a hierarchy of fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs when measuring fair value.

The fair value hierarchy can be summarized as follows:

• Level 1—Valuations based on quoted prices in active markets for identical assets or liabilities that the Company has the ability to access. Since valuations are based on quoted prices that are readily and regularly available in an active market, valuation of these products does not entail a significant degree of judgment.

• Level 2—Valuations based on quoted prices in markets that are not active or for which all significant inputs are observable, either directly or indirectly.

• Level 3—Valuations based on inputs that are unobservable and significant to the overall fair value measurement.

Changes in fair value are recognized in earnings each period for financial instruments that are carried at fair value. See Footnote 4 “Fair Value” for a description of valuation methodologies applied to the classes of financial instruments at fair value.

Collateralized agreements and financings

Collateralized agreements consist of securities borrowed. Collateralized financings primarily comprise securities loaned and financial instruments sold under agreements to repurchase.

• Securities borrowed and securities loaned transactions are recorded at the amount of cash collateral advanced or received. Securities borrowed transactions facilitate the securities settlement process and require the Company to deposit cash or other collateral with the lender. Securities loaned transactions help finance the Company’s securities inventory whereby the Company lends stock to counterparties in exchange for the receipt of cash or other collateral from the borrower. In these transactions, the Company receives or posts cash or other collateral in an amount generally in excess of the market value of the applicable securities borrowed or loaned. The Company monitors the market value of securities borrowed or loaned on a daily basis, and obtains additional collateral or refunds excess collateral as necessary.

• Financial instruments sold under agreements to repurchase and other collateralized financings are used to finance inventories of securities and other financial instruments and are recorded at their contractual amount. The Company has entered into bilateral and tri-party term and overnight repurchase and other collateralized financing agreements which bear interest at negotiated rates. The Company receives cash and makes delivery of financial instruments to a custodian who monitors the market value of these instruments on a daily basis. The market value of the instruments delivered must be equal to or in excess of the principal amount loaned under the repurchase agreements plus the agreed upon margin requirement. The custodian may request additional collateral, if appropriate.

The Company’s securities borrowed, securities loaned, financial instruments sold under agreements to repurchase and other collateralized financings are recorded at amounts that approximate fair value. These items are recorded based upon their contractual terms and are not materially sensitive to shifts in interest rates because they are short-term in nature and are substantially collateralized pursuant to the terms of the underlying agreements. These items would be categorized as Level 2 in the fair value hierarchy if they were required to be recorded at fair value.

Investments

Investments primarily comprise noncontrolling equity ownership interests in trading-related businesses and are held by the Company's non-broker dealer subsidiaries. These investments are accounted for under the equity method, at cost, or at fair value. The equity method of accounting is used when the Company has significant influence over the operating and financial policies of the investee. Investments are held at cost, less impairment if any, when the investment does not have a readily determined fair value, and the Company is not considered to exert significant influence over operating and financial policies of the investee. Investments that are publicly traded and where the Company does not exert significant influence on operating and financial policies are held at fair value and accounted for as available for sale securities and any unrealized gains or losses are recorded net of tax in Other comprehensive income.

Investments accounted for under the equity method or held at cost are reviewed on an ongoing basis to determine whether the carrying values of the investments have been impaired. If the Company determines that an impairment loss on an investment has occurred due to a decline in fair value or other conditions, the investment is written down to its estimated fair value.

Included in the Company's investments are assets supporting a non-qualified deferred compensation plan for certain employees. This plan provides a return to the participants based upon the performance of various investments. In order to hedge its liability under this plan, the Company generally acquires the underlying investments and holds such investments until the deferred compensation liabilities are satisfied. Changes in value of such investments are recorded in Investment income and other, net, with a corresponding charge or credit to Employee compensation and benefits on the Consolidated Statements of Operations. Deferred compensation investments primarily consist of mutual funds, which are accounted for at fair value.

Goodwill and intangible assets

The Company tests goodwill and intangible assets with an indefinite useful life for impairment annually or when an event occurs or circumstances change that signifies that the carrying amounts may not be recoverable. Specific events and changes that could adversely affect the Company’s assessment of its Goodwill, which is all related to its Market Making reporting unit, include the following factors that are significant inputs into its fair value calculations of its reporting units and drive the Company's revenue and expense assumptions:

• the inability to manage trading strategy performance and grow revenues and earnings;

• changes in market structure, legislative, regulatory or financial reporting rules, including the increased focus by Congress, federal and state regulators, the self-regulatory organizations and the media on market structure issues, and in particular, the scrutiny of high frequency trading, alternative trading systems, market fragmentation, colocation, access to market data feeds, and remuneration arrangements such as payment for order flow and exchange fee structures;

• future changes to the Company’s organizational structure and management;

• the Company’s ability to develop competitive new products and services in a timely manner and the acceptance of such products and services by the Company’s customers and potential customers;

• the Company’s ability to keep up with technological changes;

• the Company’s ability to effectively identify and manage market risk, operational and technology risk, cybersecurity risk, legal risk, liquidity risk, reputational risk, counterparty and credit risk, international risk, regulatory risk, and compliance risk;

• the effects of increased competition and the Company’s ability to maintain and expand market share;

• changes in discount and growth rates used by the Company in its fair value models; and

• the Company's ability to manage its costs.

The Company amortizes intangible assets with finite lives on a straight line basis over their estimated useful lives and tests for recoverability whenever events indicate that the carrying amounts may not be recoverable. The Company capitalizes certain costs associated with the acquisition or development of internal-use software and amortizes the software over its estimated useful life of three years, commencing at the time the software is placed in service.

Payable to customers

Payable to customers primarily relate to amounts due on cash and margin transactions. Due to their short-term nature, such amounts approximate fair value.

Repurchases of common stock

The Company may repurchase shares of KCG Class A Common Stock in the open market or through privately negotiated transactions. The Company may structure such repurchases as either a purchase of treasury stock or a retirement of shares. The Company records its purchases of treasury stock, which include shares repurchased in satisfaction of tax withholding obligations upon vesting of restricted awards, at cost as a separate component of stockholders’ equity. The Company may re-issue treasury stock, at average cost, for the acquisition of new businesses and in certain other circumstances. For shares that are retired, the Company records its repurchases at cost, as a reduction in KCG Class A Common Stock for the par value of such retired shares and a reduction in Retained earnings for the balance.

Repurchases of warrants

As discussed in Footnote 15 "Warrants and Stock Repurchases", in connection with the 2013 Mergers, the Company issued Class A, Class B and Class C warrants to acquire shares of KCG Class A Common Stock ("Warrants"). The Company may repurchase Warrants through privately negotiated transactions. The Company records the total cost of its purchases of Warrants as a reduction in Additional paid-in capital.

Repurchases of debt

The Company may repurchase its 6.875% Senior Secured Notes in the open market or through privately negotiated transactions. The Company records its purchases of debt as a reduction in Debt for the par value repurchased as well as a prorated reduction of original issue discount and capitalized issuance costs. Total cost also includes accrued interest on the repurchased debt, which is included in Accrued expenses and other liabilities. The Company will record a gain to the extent that it repurchases debt at a price that is less than par value less the applicable original issue discount and capitalized issuance costs. Such gains are included within Investment income and other, net on the Consolidated Statements of Operations.

Foreign currency translation and foreign currency forward contracts

The Company's foreign subsidiaries generally use the U.S. dollar as their functional currency. The Company also has subsidiaries that utilize a functional currency other than the U.S. dollar, comprising its Indian subsidiary, which utilizes the Indian Rupee and, beginning in the third quarter of 2016, Neonet, which utilizes the Swedish Krona. None of these non-U.S. dollar functional currency subsidiaries are significant to the Company’s Consolidated Financial Statements.

Assets and liabilities of these non-U.S. dollar functional currency subsidiaries are translated at exchange rates at the end of a period. Revenues and expenses are translated at average exchange rates during the period. Gains and losses resulting from translating foreign currency financial statements into U.S. dollars are included in Accumulated other comprehensive (loss) income on the Consolidated Statements of Financial Condition and Cumulative translation adjustment, net of tax on the Consolidated Statements of Comprehensive Income.

Gains or losses resulting from foreign currency transactions are included in Investment income and other, net on the Company’s Consolidated Statements of Operations. For the three months ended March 31, 2017 and 2016, the Company recorded gains of $0.2 million and $0.4 million, respectively, on foreign currency transactions.

The Company seeks to reduce the impact of fluctuations in foreign exchange rates on its net investment in certain non-U.S. operations through the use of foreign currency forward contracts. For foreign currency forward contracts designated as hedges, the Company assesses its risk management objectives and strategy, including identification of the hedging instrument, the hedged item and the risk exposure and how effectiveness is to be assessed prospectively and retrospectively. The effectiveness of the hedge is assessed based on the overall changes in the fair value of the forward contracts. For qualifying net investment hedges, any gains or losses, to the extent effective, are included in Accumulated other comprehensive (loss) income on the Consolidated Statements of Financial Condition and Cumulative translation adjustment, net of tax, on the Consolidated Statements of Comprehensive Income. The ineffective portion, if any, is recorded in Investment income and other, net on the Consolidated Statements of Operations.

Stock and unit based compensation

Stock and unit based compensation is primarily measured based on the grant date fair value of the awards. These costs are amortized over the requisite service period, if any. Expected forfeitures are considered in determining stock-based employee compensation expense. See Footnote 12 "Stock-Based Compensation" for further discussion.

Soft dollar expense

Under a commission management program, the Company allows institutional clients to allocate a portion of their gross commissions to pay for research and other services provided by third parties. As the Company acts as an agent in these transactions, it records such expenses on a net basis within Commissions and fees on the Consolidated Statements of Operations.

Depreciation, amortization and occupancy

Fixed assets are depreciated on a straight-line basis over their estimated useful lives of three to seven years. Leasehold improvements are being amortized on a straight-line basis, upon occupancy of the location, over the shorter of the term of the related office lease or the expected useful life of the assets. The Company reviews fixed assets and leasehold improvements for impairment, as well as their remaining useful lives whenever events or changes in circumstances indicate that the related carrying amounts may not be recoverable.

The Company recognizes rent expense under operating leases with fixed rent escalations, lease incentives and free rent periods on a straight-line basis over the lease term beginning on the date the Company takes possession of or controls the use of the space, including during free rent periods.

Lease loss accrual

The Company’s policy is to identify excess real estate capacity and where applicable, accrue for related future costs, net of projected sub-lease income upon the date the Company ceases to use the excess real estate. Such accrual is adjusted to the extent the actual terms of sub-leased property differ from the previous assumptions used in the calculation of the accrual.

Income taxes

The Company is a corporation subject to U.S. corporate income tax as well as non-U.S. income taxes in the jurisdictions in which it operates. The Company records deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the financial reporting and tax bases of assets and liabilities and measures them using the enacted tax rates and laws that will be in effect when such differences are expected to reverse. The Company evaluates the recoverability of future tax deductions by assessing the adequacy of future expected taxable income from all sources, including reversal of temporary differences and forecasted operating earnings.

Variable interest entities

A variable interest entity (“VIE”) is an entity that lacks one or more of the following characteristics (i) the total equity investment at risk is sufficient to enable the entity to finance its activities independently and (ii) the equity holders have the power to direct the activities of the entity that most significantly impact its economic performance, the obligation to absorb the losses of the entity and the right to receive the residual returns of the entity.

The Company will be considered to have a controlling financial interest and will consolidate a VIE if it has both (i) the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE.

Since January 2015, the Company has owned 50% of the voting shares and 50% of the equity of a joint venture (“JV”) which maintains microwave communication networks in the U.S. and Europe, and which is considered to be a VIE. The Company and its JV partner each pay monthly fees for the use of the microwave communication networks in connection with their respective trading activities, and the JV may sell excess bandwidth that is not utilized by the JV members to third parties.

In October 2016, the Company invested in another JV with nine other parties. Each party owns 10% of the voting shares and 10% of the equity of this JV, which is building microwave communication networks in the U.S. and Asia, and which is considered to be a VIE. The Company and all of its JV partners each pay monthly fees for the funding of the construction of the microwave communication networks. When completed, this JV may sell excess bandwidth that is not utilized by its joint venture members to third parties.

In each of the JVs, the Company does not have the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance; therefore it does not have a controlling financial interest in the JVs and does not consolidate the JVs. The Company records its interest in the JVs under the equity method of accounting and records its investment in the JVs within Investments and its amounts payable for communication services provided by the JVs within Accrued expenses and other liabilities on the Consolidated Statements of Financial Condition. The Company records its pro-rata share of the JVs earnings or losses within Investment income and other, net and fees related to the use of communication services provided by the JVs within Communications and data processing on the Consolidated Statements of Operations.

The Company’s exposure to the obligations of these VIEs is generally limited to its interests in each respective JV, which is the carrying value of the equity investment in each JV.

The following table presents the Company’s nonconsolidated VIEs at March 31, 2017 (in thousands):

	Carrying Amount				Maximum Exposure to loss
	Asset		Liability				VIEs' assets
Equity investment	$	15,543	$	314	$	15,543	$	41,569

The following table presents the Company’s nonconsolidated VIE at December 31, 2016 (in thousands):

	Carrying Amount				Maximum Exposure to loss
	Asset		Liability				VIE's assets
Equity investment	$	14,822	$	500	$	14,822	$	36,715

Use of estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results may differ from those estimates.

Recently adopted accounting guidance

In March 2016, the FASB issued an ASU which simplifies several aspects of the accounting for employee share-based payment transactions including the accounting for income taxes, forfeitures and classification on the statement of cash flows. The Company adopted this ASU prospectively as of January 1, 2017. Following the adoption of this ASU:

• the Company records all excess tax benefits and tax deficiencies as an income tax benefit or expense in the Consolidated Statements of Operations in the period in which they are realized. Previously such excess tax benefits and deficiencies were recorded within Additional paid-in capital on the Consolidated Statements of Financial Condition, although in certain circumstances tax deficiencies could have been recognized as income tax expense.

• excess tax benefits and tax deficiencies are classified in operating activities, specifically within changes in Accrued expenses and other liabilities, in the Consolidated Statements of Cash Flows. Prior to the adoption of this ASU, the Company reported excess tax benefits and tax deficiencies as a financing activity on its Consolidated Statements of Cash Flows.

• the Company no longer includes any assumed proceeds of any windfall tax benefits when applying the treasury stock method for computing diluted EPS. This may result in higher diluted shares outstanding for EPS calculations.

• the Company elected to continue to estimate its forfeiture rate on grant date. Therefore, a cumulative effect adjustment was not necessary upon adoption of this ASU.

Recent accounting guidance to be adopted in future periods

In May 2014, the FASB issued an ASU that updates the principles for recognizing revenue. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In March 2016, the FASB issued an ASU to clarify guidance on principal versus agent evaluation considerations and whether an entity reports revenue on a gross or net basis. These ASUs will be effective for interim and annual reporting periods beginning after December 15, 2017. Early adoption is permitted for reporting periods beginning after December 15, 2016. The Company has not yet determined its transition approach. Because the guidance does not apply to revenue associated with securities trading activities that are accounted for under other GAAP, the Company does not expect the guidance to have a material impact on its Consolidated Statements of Operations most closely associated with financial instruments, including Trading revenues, net, Commissions and fees, and Interest, net. The Company’s implementation efforts include the identification of revenue within the scope of the guidance and the evaluation of certain revenue contracts. The Company’s evaluation of the impact of the new guidance on its Consolidated Financial Statements is ongoing, and it continues to evaluate the timing of recognition for various revenues, including soft dollar related activity, which may be impacted depending on the features of the client arrangements and the presentation of certain contract costs (whether presented gross or offset against revenues).

In January 2016, the FASB issued an ASU that provides entities guidance for the accounting for equity investments, financial liabilities under the fair value option and the presentation and disclosure requirements of financial instruments. The guidance is effective for reporting periods beginning after December 15, 2018 and early adoption is permitted under a modified retrospective approach for certain financial liabilities as specified in this ASU. The Company does not expect the adoption of this ASU to have an impact on its Consolidated Financial Statements.

In February 2016, the FASB issued an ASU which requires lessees to recognize a right-to-use asset and a lease obligation for all leases. Lessees are permitted to make an accounting policy election to not recognize an asset and liability for leases with a term of twelve months or less. Additional qualitative and quantitative disclosures, including significant judgments made by management, will be required. The guidance is effective for reporting periods beginning after December 15, 2018 and early adoption is permitted under a modified retrospective approach. The Company is evaluating the impact of this ASU on its Consolidated Financial Statements.

In August 2016, the FASB issued an ASU which clarifies the presentation and classification of certain cash receipts and cash payments in the statement of cash flows. This ASU is effective for reporting periods beginning after December 15, 2017 and early adoption is permitted. The Company does not expect the adoption of this ASU to have a significant impact on its Consolidated Financial Statements.

In November 2016, the FASB issued an ASU which requires that cash segregated for regulatory and other purposes, generally described as restricted cash or restricted cash equivalents, be included in cash and cash equivalents disclosed in the statements of cash flows. The guidance is effective for all reporting periods beginning after December 15, 2017. Early adoption is permitted and must be applied retrospectively to all periods presented within the statement of cash flows. The Company does not expect the adoption of this ASU to have an impact on its Consolidated Financial Statements.

In January 2017, the FASB issued an ASU which simplifies the accounting for goodwill impairments. This ASU eliminates the two-step process that required identification of potential impairment and a separate measure of the actual impairment. Goodwill impairment charges, if any, would be determined by reducing the goodwill balance by the difference between the carrying value and the reporting unit’s fair value. The impairment charge would be limited to the carrying value of goodwill. This ASU is effective for annual and interim impairment tests for periods beginning after December 15, 2021. Early adoption is allowed for annual and interim impairment tests occurring after January 1, 2017. The Company does not expect the adoption of this ASU to have a significant impact on its Consolidated Financial Statements.

In January 2017, the FASB issued an ASU to clarify the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The ASU is effective for reporting periods beginning after December 15, 2017. The Company does not expect the adoption of this ASU to have a significant impact on its Consolidated Financial Statements.

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Assets of Business Held for Sale & Sales of Businesses

3 Months Ended

Mar. 31, 2017

Discontinued Operations and Disposal Groups [Abstract]

Assets of Business Held for Sale & Sales of Businesses

Assets of Business Held for Sale & Sales of Businesses

In March 2015, the Company sold its spot institutional foreign exchange ECN, KCG Hotspot, to Bats Global Markets, Inc. ("Bats"). As part of the sale, the Company and Bats have agreed to share certain tax benefits, which could result in future payments to the Company of up to approximately $70.0 million in the three-year period following the close, consisting of a $50.0 million payment in 2018 and annual payments of up to $6.6 million per year (the "Annual Payments"), from 2016 up to and including 2018. On March 1, 2017, Bats merged with CBOE Holdings, Inc. (“CBOE”) (the “Bats Merger”). The remaining Annual Payments are contingent on CBOE generating sufficient taxable net income to receive the tax benefits.

The Company has elected the fair value option related to the receivable from Bats and considers the receivable to be a Level 2 asset in the fair value hierarchy as the fair value is derived from observable significant inputs such as contractual cash flows and market discount rates. KCG received the first and second Annual Payments of $6.6 million and $6.5 million in March 2016 and 2017, respectively. The remaining additional potential payments of $56.8 million are recorded at a fair value of $54.1 million in Other assets on the Consolidated Statement of Financial Condition as of March 31, 2017.

In accordance with the Company's strategic review of its businesses and evaluation of their potential value in the marketplace relative to their current and expected returns, KCG determined in 2015 that certain of its businesses including its DMM and retail options market making businesses, were no longer considered core to its strategy.

Assets of businesses held for sale are recorded at the lower of their book value or their estimated fair value and are reported as Assets of business held for sale on the Consolidated Statements of Financial Condition. Included in the $8.2 million of Assets of business held for sale at December 31, 2016 were assets related to a technology platform. At March 31, 2017, the Company determined that this business was no longer held for sale and as a result, reclassified the assets back to intangible assets on the Consolidated Statements of Financial Condition. The Company does not have any businesses that are considered to be held for sale at March 31, 2017. See Footnote 9 "Goodwill and Intangible Assets" for further details.

Assets related to the Company's retail options market making business, which were sold to a third party in March 2016 resulted in a gain of $2.9 million, which is included in Investment income and other, net on the Consolidated Statement of Operations for the three months ended March 31, 2016. The DMM business was sold to Citadel in May 2016. As charges were recorded in the fourth quarter of 2015 to reflect the estimated fair value of this held for sale business, no gain or loss on sale was recorded in 2016.

The assets of businesses held for sale as December 31, 2016 are summarized as follows (in thousands):

	December 31, 2016
Assets:
Intangible assets, net of accumulated amortization	$	8,194
Total assets of businesses held for sale	$	8,194

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Fair Value

3 Months Ended

Mar. 31, 2017

Fair Value Disclosures [Abstract]

Fair Value

Fair Value

The Company’s financial instruments recorded at fair value have been categorized based upon a fair value hierarchy in accordance with accounting guidance, as described in Footnote 2 “Significant Accounting Policies.” The following fair value hierarchy table presents information about the Company’s financial assets and liabilities measured at fair value (in thousands):

	Assets and Liabilities Measured at Fair Value on a Recurring Basis
March 31, 2017	Level 1		Level 2		Level 3		Total
Assets
Financial instruments owned, at fair value:
Equities	$	2,179,211	$	—	$	—	$	2,179,211
Corporate debt	91,314		—		—		91,314
U.S. government and Non-U.S. government obligations	37,618		—		—		37,618
Listed options	12,299		—		—		12,299
Total Financial instruments owned, at fair value	2,320,442		—		—		2,320,442
Investments(1)	2,379		2,234		—		4,613
Other (2)	—		54,142		2,838		56,980
Total assets held at fair value	$	2,322,821	$	56,376	$	2,838	$	2,382,035
Liabilities
Financial instruments sold, not yet purchased, at fair value:
Equities	$	1,694,374	$	—	$	—	$	1,694,374
Corporate debt	85,926		—		—		85,926
U.S. government and Non-U.S. government obligations	91,242		—		—		91,242
Listed options	35,835		—		—		35,835
Foreign currency forward contracts	—		598		—		598
Total liabilities held at fair value	$	1,907,377	$	598	$	—	$	1,907,975

⁽¹⁾  Investments comprise $2.4 million of Level 1 investments in CME Group and $2.2 million of Level 2 investments primarily related to deferred compensation investments, all of which are included within Investments on the Consolidated Statements of Financial Condition. See Footnote 8 "Investments" for additional information.

⁽²⁾  Other primarily consists of a $54.1 million receivable from Bats related to the sale of KCG Hotspot and a $2.8 million receivable from the sale of an investment, both of which are included within Other Assets on the Consolidated Statements of Financial Condition.

	Assets and Liabilities Measured at Fair Value on a Recurring Basis
December 31, 2016	Level 1		Level 2		Level 3		Total
Assets
Financial instruments owned, at fair value:
Equities	$	2,343,033	$	—	$	—	$	2,343,033
Corporate debt	127,237		—		—		127,237
U.S. government and Non-U.S. government obligations	50,461		—		—		50,461
Listed options	19,100		—		—		19,100
Foreign currency forward contracts	—		30		—		30
Total Financial instruments owned, at fair value	2,539,831		30		—		2,539,861
Investments (1)	9,198		2,286		—		11,484
Other (2)	—		60,538		2,846		63,384
Total assets held at fair value	$	2,549,029	$	62,854	$	2,846	$	2,614,729
Liabilities
Financial instruments sold, not yet purchased, at fair value:
Equities	$	1,821,957	$	—	$	—	$	1,821,957
Listed options	12,961		—		—		12,961
U.S. government obligations	87,661		—		—		87,661
Corporate debt	123,561		—		—		123,561
Total liabilities held at fair value	$	2,046,140	$	—	$	—	$	2,046,140

⁽¹⁾  Investments comprise $9.2 million of Level 1 investments in CME Group and Bats and also includes $2.3 million of Level 2 investments primarily related to deferred compensation investments, all of which are included within Investments on the Consolidated Statements of Financial Condition. See Footnote 8 "Investments" for additional information.

⁽²⁾  Other primarily consists of a $60.5 million receivable from Bats related to the sale of KCG Hotspot and a $2.8 million receivable from the sale of an investment, both of which are included in Other assets on the Consolidated Statements of Financial Condition.

The Company's derivative financial instruments are also held at fair value. See Footnote 5 "Derivative Financial Instruments" for further information.

The Company’s equities, listed options, U.S. government and non-U.S. government obligations, corporate debt and strategic investments that are publicly traded and for which the Company does not exert significant influence on operating and financial policies are generally classified within Level 1 of the fair value hierarchy because they are valued using quoted market prices or broker or dealer quotations with reasonable levels of price transparency.

The types of instruments that trade in markets that are not considered to be active, but are valued based on observable inputs such as quoted market prices or alternative pricing sources with reasonable levels of price transparency are generally classified within Level 2 of the fair value hierarchy.

As of March 31, 2017 and December 31, 2016, a receivable related to the sale of an investment was classified within Level 3 of the fair value hierarchy.

There were no transfers of assets or liabilities held at fair value between levels of the fair value hierarchy for any periods presented.

The following is a summary of changes in fair value of the Company's financial assets that have been categorized within Level 3 of the fair value hierarchy at March 31, 2017 and December 31, 2016 (in thousands):

	Level 3 Financial Assets as of March 31, 2017
	Balance at January 1, 2017		Realized gains(losses) during period		Unrealized gains (losses) during the period			Purchases		Sales		Settlements		Issuances		Transfers in or (out) of Level 3		Balance at March 31, 2017
Receivable from sold investment	$	2,846	$	—	$	(8	)	$	—	$	—	$	—	$	—	$	—	$	2,838

	Level 3 Financial Assets as of December 31, 2016
	Balance at January 1, 2016		Realized gains(losses) during period		Unrealized gains (losses) during the period		Purchases		Sales		Settlements			Issuances		Transfers in or (out) of Level 3		Balance at December 31, 2016
Receivable from sold investment	$	5,789	$	—	$	980	$	—	$	—	$	(3,923	)	$	—	$	—	$	2,846

Unrealized gains or losses are included within Investment income and other, net on the Consolidated Statements of Operations.

The following is a description of the valuation basis, techniques and significant inputs used by the Company in valuing its Level 2 and Level 3 assets and liabilities.

Foreign currency forward contracts

At March 31, 2017 and December 31, 2016, the Company had a foreign currency forward contract with a notional value of 735.0 million Indian Rupees ($11.3 million). This forward contract is used to hedge the Company’s investment in its Indian subsidiary.

The fair value of these forward contracts were determined based upon spot foreign exchange rates and dealer quotations.

Investments

Investments primarily include deferred compensation investments which comprise investments in liquid mutual funds that the Company acquires to hedge its obligations to employees under certain non-qualified deferred compensation arrangements. These mutual fund investments can generally be redeemed at any time and are valued based upon quoted market prices.

Other

Other primarily consists of the fair value of the Company's receivable from Bats/CBOE from the sale of KCG Hotspot as more fully described in Footnote 3 "Assets of Business Held for Sale & Sales of Businesses".

The Company has elected the fair value option related to its receivable from Bats/CBOE. It considers the receivable to be a Level 2 asset in the fair value hierarchy as the fair value is derived from observable significant inputs such as contractual cash flows and market discount rates.

The Company has elected the fair value option related to a receivable originating from the sale of an investment which is classified within Level 3 of the fair value hierarchy. As of March 31, 2017, the range of undiscounted amounts the Company may receive for this receivable is between $0 and $4.6 million. The valuation of this financial instrument was based upon the use of a model developed by Company management. Inputs into this model were based upon risk profiles of similar financial instruments in the market and reflects management’s judgment relating to the appropriate discount on the receivable as well as a financial assessment of the debtor. To the extent that valuations based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. Movements in these unobservable inputs would not materially impact the Company's results of operations.

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Derivative Financial Instruments

3 Months Ended

Mar. 31, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

Derivative Financial Instruments

The Company enters into derivative transactions as part of its trading activities and to manage foreign currency exposure. Cash flows associated with such derivative activities are included in cash flows from operating activities on the Consolidated Statements of Cash Flows.

During the normal course of business, the Company enters into futures contracts. These financial instruments are subject to varying degrees of risks whereby the fair value of the securities underlying the financial instruments may be in excess of, or less than, the contract amount. The Company is obligated to post collateral against certain futures contracts.

The Company has entered into and may continue to enter into International Swaps and Derivative Association, Inc. (“ISDA”) master netting agreements with counterparties. Master agreements provide protection in bankruptcy in certain circumstances and, where legally enforceable, enable receivables and payables with the same counterparty to be settled or otherwise eliminated by applying amounts due against all or a portion of an amount due from the counterparty or a third party. The Company may also enter into bilateral trading agreements and other customer agreements that provide for the netting of receivables and payables with a given counterparty as a single net obligation.

Under the ISDA master netting agreements, the Company typically also executes credit support annexes, which provide for collateral, either in the form of cash or securities, to be posted or paid by a counterparty based on the fair value of the derivative receivable or payable based on the rates and parameters established in the credit support annex. In the event of counterparty’s default, provisions of the ISDA master agreement permit acceleration and termination of all outstanding transactions covered by the agreement such that a single amount is owed by, or to, the non-defaulting party. Any collateral posted can be applied to the net obligations, with any excess returned and the collateralized party has a right to liquidate the collateral. Any residual claim after netting is treated along with other unsecured claims in bankruptcy court.

The Company is also a party to clearing agreements with various central clearing parties. Under these arrangements, the central clearing counterparty facilitates settlement between counterparties based on the net payable owed or receivable due and, with respect to daily settlement, cash is generally only required to be deposited to the extent of the net amount. In the event of default, a net termination amount is determined based on the market values of all outstanding positions and the clearing organization or clearing member provides for the liquidation and settlement of the net termination amount among all counterparties to the open derivative contracts.

The following tables summarize the fair value and number of derivative instruments held at March 31, 2017 and December 31, 2016. These instruments include those classified as Financial instruments owned, at fair value, Financial instruments sold, not yet purchased, at fair value, as well as futures contracts and bi-lateral over the counter swaps which are reported within Receivable from brokers, dealers and clearing organizations on the Consolidated Statements of Financial Condition. The fair value of assets/liabilities are shown gross of counterparty netting and cash collateral received and pledged. The following tables also provide information regarding 1) the extent to which, under enforceable master netting agreements, such balances are presented net on the Consolidated Statements of Financial Condition as appropriate under GAAP, and 2) the extent to which other rights of setoff associated with these agreements exist and could have an effect on the Company's financial position (in thousands, except contract amounts):

		March 31, 2017
	Financial Statements	Assets				Liabilities
	Location	Fair Value			Contracts	Fair Value			Contracts
Foreign currency
Futures contracts	Receivable from brokers, dealers and clearing organizations	$	163		364	$	240		438
Forward contracts (1)	Financial instruments owned, at fair value	—			—	598			1
Equity
Futures contracts	Receivable from brokers, dealers and clearing organizations	1,594			7,047	2,978			7,326
Swap contracts	Receivable from brokers, dealers and clearing organizations	—			—	195			2
Listed options	Financial instruments owned/sold, not yet purchased, at fair value	12,299			75,294	35,835			76,347
Fixed income
Futures contracts	Receivable from brokers, dealers and clearing organizations	2,545			4,234	5,678			4,038
Commodity
Futures contracts	Receivable from brokers, dealers and clearing organizations	45,889			23,531	45,697			25,762
Gross derivative assets/liabilities, before netting		$	62,490			$	91,221
Less: Legally enforceable master netting agreements
Exchange traded (3)		(49,841		)		(54,593		)
Bi-lateral over-the-counter (4)		—				(195		)
Net amounts per Consolidated Statement of Financial Condition (5)		$	12,649			$	36,433

		December 31, 2016
	Financial Statements	Assets				Liabilities
	Location	Fair Value			Contracts	Fair Value			Contracts
Foreign currency
Futures contracts	Receivable from brokers, dealers and clearing organizations	$	360		1,285	$	1,663		6,495
Forward contracts (1)	Financial instruments owned, at fair value	30			1	—			—
Equity
Futures contracts	Receivable from brokers, dealers and clearing organizations	1,451			2,056	1,644			2,944
Swap contracts	Receivable from brokers, dealers and clearing organizations	16			1	154			1
Listed options	Financial instruments owned/sold, not yet purchased, at fair value	19,100			85,797	12,961			90,063
Forward contracts(2)	Accrued expenses and other liabilities	—			—	1,599			1
Fixed income
Futures contracts	Receivable from brokers, dealers and clearing organizations	4,627			8,590	5,541			5,165
Commodity
Futures contracts	Receivable from brokers, dealers and clearing organizations	86,393			31,800	86,100			31,906
Gross derivative assets/liabilities, before netting		$	111,977			$	109,662
Less: Legally enforceable master netting agreements
Exchange traded (3)		(92,572		)		(94,948		)
Bi-lateral over-the-counter (4)		—				(154		)
Net amounts per Consolidated Statement of Financial Condition (5)		$	19,405			$	14,560

⁽¹⁾  The foreign currency forward contract represents a net investment hedge and is designated as a hedging instrument.

⁽²⁾  The equity forward contract represents a liability to deliver shares of Bats common stock to General Atlantic as described in Footnote 8 "Investments".

⁽³⁾  Exchange traded instruments comprise futures contracts.

⁽⁴⁾  Bi-lateral over-the-counter instruments comprise swaps and forward contracts.

⁽⁵⁾  The Company has not received or pledged additional collateral under master netting agreements and or other credit support agreements that is eligible to be offset beyond what is offset in the Consolidated Statements of Financial Condition.

The fair value of listed options and forward contracts in the tables above are classified as Level 1 and Level 2 in the fair value hierarchy, respectively. The fair value of futures contracts and swaps in the tables above are classified as Level 1 and Level 2 in the fair value hierarchy, respectively.

The following table summarizes the gains and losses included in the Consolidated Statements of Operations for the three months ended March 31, 2017 and 2016.

		Gain (Loss) Recognized
	Financial Statements	For the three months ended March 31,
	Location	2017			2016
Derivative instruments not designated as hedging instruments:
Foreign currency
Futures contracts	Trading revenues, net	$	2,712		$	312
Equity
Futures contracts	Trading revenues, net	(7,998		)	8,922
Swap contracts	Trading revenues, net	(795		)	1,886
Listed options	Trading revenues, net	(24		)	3,871
Fixed income
Futures contracts	Trading revenues, net	(118		)	6,833
Commodity
Futures contracts	Trading revenues, net	3,750			6,966
		$	(2,473	)	$	28,790
Derivative instruments designated as hedging instruments:
Foreign exchange - forward contract	Accumulated other comprehensive (loss) income	$	(389	)	$	(149	)

Financial instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk

As a market maker in global equities, fixed income, futures, options, commodities and currencies, the majority of the Company’s securities transactions are conducted as principal or riskless principal with broker dealers and institutional counterparties primarily located in the United States. The Company self-clears substantially all of its U.S. equity and option securities transactions. The Company clears a portion of its securities transactions through third party clearing brokers. Foreign transactions are settled pursuant to global custody and clearing agreements with major U.S. banks. Substantially all of the Company’s credit exposures are concentrated with its clearing brokers, broker dealer and institutional counterparties. The Company’s policy is to monitor the credit standing of counterparties with which it conducts business.

Financial instruments sold, not yet purchased, at fair value represent obligations to purchase such securities (or underlying securities) at a future date. The Company may incur a loss if the market value of the securities subsequently increases.

The Company currently has no loans outstanding to any former or current executive officer or director.

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Collateralized Transactions

3 Months Ended

Mar. 31, 2017

Collateralized Agreements [Abstract]

Collateralized Transactions

Collateralized Transactions

The Company receives financial instruments as collateral in connection with securities borrowed and financial instruments purchased under agreements to resell. Such financial instruments generally consist of equities, corporate obligations and obligations of the U.S. government, but may also include obligations of federal agencies, foreign governments and convertible securities. In most cases the Company is permitted to deliver or repledge these financial instruments in connection with securities lending, other secured financings or for meeting settlement obligations.

The table below presents financial instruments at fair value received as collateral related to Securities borrowed or Receivable from brokers, dealers and clearing organizations on the Consolidated Statements of Financial Condition that were permitted to be delivered or repledged and that were delivered or repledged by the Company as well as the fair value of financial instruments which could be further repledged by the receiving party (in thousands):

	March 31, 2017		December 31, 2016
Collateral permitted to be delivered or repledged	$	1,623,886	$	1,634,979
Collateral that was delivered or repledged	1,577,554		1,550,755
Collateral permitted to be further repledged by the receiving counterparty	151,534		41,730

In order to finance securities positions, the Company also pledges financial instruments that it owns to counterparties who, in turn, are permitted to deliver or repledge them. Under these transactions, the Company pledges certain financial instruments owned to collateralize repurchase agreements and other secured financings. Repurchase agreements and other secured financings are short-term and mature within one year. Financial instruments owned and pledged to counterparties that have the right to sell or repledge such financial instruments primarily consist of equities. Financial instruments owned and pledged to counterparties that do not have the right to sell or repledge such financial instruments consist of equities, corporate obligations and obligations of the U.S. government, but may also include obligations of federal agencies, foreign governments and convertible securities.

The table below presents information about assets pledged by the Company (in thousands):

	March 31, 2017		December 31, 2016
Financial instruments owned, at fair value, pledged to counterparties that have the right to deliver or repledge	$	368,736	$	314,720
Financial instruments owned, at fair value, pledged to counterparties that do not have the right to deliver or repledge	1,204,165		1,291,979

The table below presents the gross carrying value of Securities loaned, Financial instruments sold under agreements to repurchase and other collateralized financings by class of collateral pledged (in thousands):

March 31, 2017			Financial instruments sold under agreements to repurchase		Other collateralized financings
Asset Class	Securities Loaned
Equities	$	459,533	$	940,000	$	50,000
U.S. government obligations	—		12,584		—
Total	$	459,533	$	952,584	$	50,000

December 31, 2016			Financial instruments sold under agreements to repurchase		Other collateralized financings
Asset Class	Securities Loaned
Equities	$	369,168	$	989,812	$	76,176
U.S. government obligations	—		12,775		—
Corporate debt	3,463		25,188		23,824
Total	$	372,631	$	1,027,775	$	100,000

The Company may enter into master netting agreements and collateral arrangements with counterparties in order to manage its exposure to credit risk associated with securities financing transactions. Such transactions are generally executed under standard industry agreements, including, but not limited to, master securities lending agreements (securities lending transactions) and master repurchase agreements (repurchase transactions). Master agreements provide protection in bankruptcy in certain circumstances and, where legally enforceable, enable receivables and payables with the same counterparty to be settled or otherwise eliminated by applying amounts due against all or a portion of an amount due from the counterparty or a third party. The Company may also enter into bilateral trading agreements and other customer agreements that provide for the netting of receivables and payables with a given counterparty as a single net obligation.

In the event of a counterparty’s default, provisions of the master agreement permit acceleration and termination of all outstanding transactions covered by the agreement such that a single amount is owed by, or to, the non-defaulting party. Any collateral posted can be applied to the net obligations, with any excess returned and the collateralized party has a right to liquidate the collateral. Any residual claim after netting is treated as an unsecured claim in bankruptcy court.

The Company is also a party to clearing agreements with various central clearing parties. Under these arrangements, the central clearing counterparty facilitates settlement between counterparties based on the net payable owed or receivable due and, with respect to daily settlement, cash is generally only required to be deposited to the extent of the net amount. In the event of default, a net termination amount is determined based on the market values of all outstanding positions and the clearing organization or clearing member provides for the liquidation and settlement of the net termination amount among all counterparties to the open repurchase and/or securities lending transactions.

The gross amounts of assets and liabilities subject to netting and gross amounts offset in the Consolidated Statements of Financial Condition were as follows (in thousands):

March 31, 2017	Gross Amounts Recognized		Gross Amounts Offset in the Statements of Financial Condition		Net Amounts Presented in the Statements of Financial Condition		Gross Amounts Not Offset in the Statement of Financial Condition				Net Amount
							Available Collateral(1)		Counterparty Netting(2)
Assets
Securities borrowed	$	1,594,442	$	—	$	1,594,442	$	1,537,957	$	6,225	$	50,260
Receivable from brokers, dealers and clearing organizations (3)	13,735		—		13,735		13,717		2		16
Total assets	$	1,608,177	$	—	$	1,608,177	$	1,551,674	$	6,227	$	50,276
Liabilities
Securities loaned	$	459,533	$	—	$	459,533	$	446,050	$	6,225	$	7,258
Financial instruments sold under agreements to repurchase	952,584		—		952,584		952,582		2		—
Other collateralized financings	50,000		—		50,000		50,000		—		—
Total liabilities	$	1,462,117	$	—	$	1,462,117	$	1,448,632	$	6,227	$	7,258

⁽¹⁾  Includes securities received or delivered under collateral arrangements with counterparties that could be liquidated in the event of a counterparty default and thus offset against a counterparty's rights and obligations under the respective repurchase agreements or securities borrowing or lending arrangements.

⁽²⁾  Under master netting agreements with its counterparties, the Company has the legal right of offset with a counterparty, which incorporates all of the counterparty's outstanding rights and obligations under the arrangement. These balances reflect additional credit risk mitigation that is available by counterparty in the event of a counterparty's default, but which are not netted in the Consolidated Statement of Financial Condition because other netting provisions under U.S. GAAP are not met.

⁽³⁾  Represents financial instruments purchased under agreement to resell.

December 31, 2016	Gross Amounts Recognized		Gross Amounts Offset in the Statements of Financial Condition		Net Amounts Presented in the Statements of Financial Condition		Gross Amounts Not Offset in the Statement of Financial Condition				Net Amount
							Available Collateral(1)		Counterparty Netting(2)
Assets
Securities borrowed	$	1,688,222	$	—	$	1,688,222	$	1,623,281	$	4,581	$	60,360
Receivable from brokers, dealers and clearing organizations (3)	21,832		—		21,832		21,797		—		35
Total assets	$	1,710,054	$	—	$	1,710,054	$	1,645,078	$	4,581	$	60,395
Liabilities
Securities loaned	$	372,631	$	—	$	372,631	$	358,023	$	4,581	$	10,027
Financial instruments sold under agreements to repurchase	1,027,775		—		1,027,775		1,027,775		—		—
Other collateralized financings	100,000		—		100,000		100,000		—		—
Total liabilities	$	1,500,406	$	—	$	1,500,406	$	1,485,798	$	4,581	$	10,027

⁽¹⁾  Includes securities received or delivered under collateral arrangements with counterparties that could be liquidated in the event of a counterparty default and thus offset against a counterparty's rights and obligations under the respective repurchase agreements or securities borrowing or lending arrangements.

⁽²⁾  Under master netting agreements with its counterparties, the Company has the legal right of offset with a counterparty, which incorporates all of the counterparty's outstanding rights and obligations under the arrangement. These balances reflect additional credit risk mitigation that is available by a counterparty in the event of a counterparty's default, but which are not netted in the Consolidated Statement of Financial Condition because other netting provisions under U.S. GAAP are not met.

⁽³⁾  Represents financial instruments purchased under agreement to resell.

See Footnote 5 "Derivative Financial Instruments" for information related to the offsetting of derivatives in the Company's Consolidated Financial Statements.

Maturities of Securities loaned, Financial instruments sold under agreements to repurchase and other collateralized financings are provided in the table below (in thousands):

As of March 31, 2017	Overnight		0 - 30 days		31 - 60 days		61 - 90 days		Total
Securities loaned	$	459,533	$	—	$	—	$	—	$	459,533
Financial instruments sold under agreements to repurchase	12,584		335,000		365,000		240,000		952,584
Other collateralized financings	—		50,000		—		—		50,000
Total	$	472,117	$	385,000	$	365,000	$	240,000	$	1,462,117

As of December 31, 2016	Overnight		0 - 30 days		31 - 60 days		61 - 90 days		Total
Securities loaned	$	372,631	$	—	$	—	$	—	$	372,631
Other	—		100,000		—		—		100,000
Financial instruments sold under agreements to repurchase	12,775		410,000		465,000		140,000		1,027,775
Total	$	385,406	$	510,000	$	465,000	$	140,000	$	1,500,406

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Receivable from and Payable to Brokers, Dealers and Clearing Organizations

3 Months Ended

Mar. 31, 2017

Brokers and Dealers [Abstract]

Receivable from and Payable to Brokers, Dealers and Clearing Organizations

Receivable from and Payable to Brokers, Dealers and Clearing Organizations

Amounts receivable from and payable to brokers, dealers and clearing organizations consist of the following (in thousands):

	March 31, 2017		December 31, 2016
Receivable:
Clearing organizations and other	$	575,544	$	619,425
Financial instruments purchased under agreement to resell	13,735		21,832
Securities failed to deliver	212,399		191,528
Total receivable	$	801,678	$	832,785
Payable:
Clearing organizations and other	$	433,164	$	458,341
Securities failed to receive	62,089		60,559
Total payable	$	495,253	$	518,900

Management believes that the carrying value of amounts receivable from and payable to brokers, dealers and clearing organizations approximates fair value since they are short term in nature.

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Investments

3 Months Ended

Mar. 31, 2017

Investments [Abstract]

Investments

Investments

Investments primarily comprise strategic investments and deferred compensation investments. Investments consist of the following (in thousands):

	March 31, 2017		December 31, 2016
Strategic investments:
Investments accounted for under the equity method	$	17,313	$	16,707
Investments held at fair value	2,379		9,198
Investments held at cost, less impairment	2,790		2,789
Total strategic investments	22,482		28,694
Other investments	2,234		2,285
Total investments	$	24,716	$	30,979

For the three months ended March 31, 2017 and 2016, the Company recorded income of approximately $48 thousand and $4.8 million, respectively, related to Investments accounted for under the equity method of accounting, which is recorded within Investment income and other, net in the Consolidated Statements of Operations. The Company's investments accounted for under the equity method are considered to be related parties. See Footnote 11 "Related Parties".

In the first quarter of 2016, one of the Company's investments held at adjusted cost, less impairment made a distribution to its owners, including the Company. As a result of this distribution, the Company adjusted the investment's carrying value and recognized a pre-tax gain of $2.3 million, which is included in Investment income and other, net on the Consolidated Statements of Operations for the three months ended March 31, 2016.

Investments held at fair value are accounted for as available for sale securities and any unrealized gains or losses are recorded net of tax in Other comprehensive (loss) income.

Bats/General Atlantic Transactions

In the fourth quarter 2016, the Company sold approximately 2.0 million shares of common stock of Bats in the open market (“open market transactions”) and sold an additional 2.2 million shares of common stock of Bats in a block sale ("block sale").

In November 2016 KCG entered into a purchase agreement with GA-GTCO Interholdco, LLC (“General Atlantic” or “GA”) to exchange approximately 8.9 million shares of its Bats common stock for i) GA’s 18.7 million shares of KCG Class A Common Stock and, ii) 8.1 million Warrants (the “Swap Transaction”).

The Company’s 6.875% Indenture (as defined below) contains covenants that limit the Company’s ability to repurchase shares of KCG Class A Common Stock and Warrants.

Substantially all of the exchange was completed in November 2016, however as a result of these limitations, and as contemplated in the agreement with GA, the Company could not finalize the repurchase of approximately 1.1 million Warrants, and therefore retained approximately 94,000 common shares of Bats at December 31, 2016. The $2.9 million value of these remaining Bats shares was recorded as a receivable from GA within Other assets and a related $2.9 million liability to GA was recorded within Accrued expenses and other liabilities on the Company’s December 31, 2016 Consolidated Statement of Financial Condition. The exchange was completed in January 2017.

Pursuant to the terms of the Swap Transaction, the Company paid transaction fees of $2.9 million to Jefferies LLC, comprising half due from the Company and the other half on behalf of GA. The settlement of the portion paid by the Company on behalf of GA was completed by KCG retaining Bats common stock with a fair value of $1.4 million at the time of the Swap Transaction, or approximately 46,000 shares of the aforementioned 94,000 shares of Bats shares owed to GA. The remaining 48,000 shares owed to GA were considered to be a derivative for financial reporting purposes as of December 31, 2016. See Footnote 5 "Derivative Financial Instruments".

As a result of the open market transactions, block sale and Swap Transaction, the Company sold approximately 13.0 million shares of Bats, and the Company’s total holdings were reduced to approximately 206,000 shares or less than 0.5% of total shares of Bats common stock outstanding. The Company believes that it no longer has significant influence over Bats, and as a result, in November 2016, the Company ceased to account for its remaining interest in Bats under the equity method.

The approximately 206,000 shares of Bats remaining as an investment had a fair value of $6.9 million at December 31, 2016 and were classified as available-for-sale securities (“AFS”), which was recorded within Investments on the Company’s Consolidated Statements of Financial Condition as of December 31, 2016.

In the first quarter of 2017, the Company sold its remaining shares of Bats and recorded a pre-tax gain of $4.8 million which is included in Investment income and other, net on the Consolidated Statements of Operations for the three months ended March 31, 2017. As of March 31, 2017, the Company does not own any shares of Bats.

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Goodwill and Intangible Assets

3 Months Ended

Mar. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

Goodwill and Intangible Assets

Goodwill and intangible assets with indefinite lives are assessed for impairment annually or when events indicate that the amounts may be impaired. The Company assesses goodwill for impairment at the reporting unit level. The Company’s reporting units are the components of its business segments for which discrete financial information is available and is regularly reviewed by the Company’s management. As part of the assessment for impairment, the Company considers the cash flows of the respective reporting unit and assesses the fair value of the respective reporting unit as well as the overall market value of the Company compared to its net book value. The assessment of fair value of the reporting units is principally performed using a discounted cash flow methodology with a risk-adjusted weighted average cost of equity which the Company believes to be the most reliable indicator of the fair values of its respective reporting units. The Company also assesses the fair value of each reporting unit based upon its estimated market value and assesses the Company’s overall market value based upon the market price of KCG Class A Common Stock.

Intangible assets are assessed for recoverability when events or changes in circumstances indicate that the carrying amount of the asset or asset group may not be recoverable. The Company assesses intangible assets for impairment at the “asset group” level which is the lowest level for which identifiable cash flows are largely independent of the cash flows of other groups of assets and liabilities. As part of the assessment for impairment, the Company considers the cash flows of the respective asset group and assesses the fair value of the respective asset group. Step one of the impairment assessment for intangibles is performed using undiscounted cash flow models, which indicates whether the future cash flows of the asset group are sufficient to recover the book value of such asset group. When an asset is not considered to be recoverable, step two of the impairment assessment is performed using a discounted cash flow methodology with a risk-adjusted weighted average cost of equity to determine the fair value of the intangible asset group. In cases where amortizable intangible assets and goodwill are assessed for impairment at the same time, the amortizable intangibles are assessed for impairment prior to goodwill being assessed.

No events occurred in the three months ended March 31, 2017 or 2016 that would indicate that the carrying amounts of the Company’s goodwill or intangible assets may not be recoverable.

As detailed in Footnote 3 “Assets of Business Held for Sale & Sales of Businesses”, in late 2015, the Company conducted a strategic review of its businesses and determined that one of its businesses was no longer considered core to its strategy and the Company sought the opportunity to exit or divest this business. The estimated fair value of intangibles related to a business held for sale of $8.2 million as of December 31, 2016 was reported within Assets of business held for sale on the Consolidated Statements of Financial Condition. These intangibles, which comprise a technology platform, have been reclassified to Intangible Assets as of March 31, 2017 as it has been determined that such assets of the business will not be sold.

As of both March 31, 2017 and December 31, 2016, $16.4 million of goodwill was recorded within the Market Making segment.

Intangible assets with definite useful lives are amortized over their remaining estimated useful lives, the majority of which have been determined to range from one to six years. The weighted average remaining life of the Company’s intangible assets with definite useful lives at both March 31, 2017 and December 31, 2016 was approximately two years.

The following tables summarize the Company’s Intangible assets, net of accumulated amortization by segment and type (in thousands):

	March 31, 2017		December 31, 2016
Market Making
Technology	$	38,759	$	39,536
Trading rights	7,028		7,027
Total	45,787		46,563
Global Execution Services
Technology	20,033		20,694
Customer relationships	7,583		7,944
Trade names	625		650
Total	28,241		29,288
Corporate and Other
Technology (1)	16,418		8,084
Total	$	90,446	$	83,935

⁽¹⁾  Excluded from the December 31, 2016 balance is $8.2 million of intangibles related to a business which met the requirements to be considered held for sale. As noted above and in Footnote 3 "Assets of Business Held for Sale & Sales of Businesses", such amounts were included in Assets of business held for sale at December 31, 2016, however, such intangibles were no longer considered to be held for sale at March 31, 2017 and are therefore included above at March 31, 2017.

		March 31, 2017			December 31, 2016
Technology (1)	Gross carrying amount	$	183,567		$	157,188
	Accumulated amortization	(108,347		)	(88,874		)
	Net carrying amount	75,220			68,314
Trading rights (2)	Gross carrying amount	7,509			7,509
	Accumulated amortization	(491		)	(482		)
	Net carrying amount	7,018			7,027
Customer relationships (3)	Gross carrying amount	13,000			13,000
	Accumulated amortization	(5,417		)	(5,056		)
	Net carrying amount	7,583			7,944
Trade names (4)	Gross carrying amount	1,000			1,000
	Accumulated amortization	(375		)	(350		)
	Net carrying amount	625			650
Total	Gross carrying amount	205,076			178,697
	Accumulated amortization	(114,630		)	(94,762		)
	Net carrying amount	$	90,446		$	83,935

⁽¹⁾  The weighted average remaining life for technology, including capitalized internal use software, was approximately two years as of both March 31, 2017 and December 31, 2016. Excluded from the December 31, 2016 balance is $8.2 million of technology assets related to Assets of businesses held for sale. As noted above and in Footnote 3 "Assets of Business Held for Sale & Sales of Businesses", these assets are included in Assets of businesses held for sale at December 31, 2016.

⁽²⁾  Trading rights provide the Company with the rights to trade on certain exchanges. The weighted average remaining life of trading rights with definite useful lives was approximately 3 and 4 years as of March 31, 2017 and December 31, 2016, respectively. As of March 31, 2017 and December 31, 2016, $6.9 million of trading rights had indefinite useful lives.

⁽³⁾  Customer relationships relate to KCG BondPoint. The weighted average remaining life was approximately 5 and 6 years as of March 31, 2017 and December 31, 2016, respectively. Lives may be reduced depending upon actual retention rates.

⁽⁴⁾  Trade names relate to KCG BondPoint. The weighted average remaining life was approximately 6 and 7 years as of March 31, 2017 and December 31, 2016, respectively.

The following table summarizes the Company’s amortization expense relating to Intangible assets (in thousands):

	For the three months ended March 31,
	2017		2016
Amortization expense	$	10,109	$	7,559

As of March 31, 2017, the following table summarizes the Company’s estimated amortization expense for future periods (in thousands):

	Amortization     expense
For the nine months ended December 31, 2017	$	33,654
For the year ended December 31, 2018	32,749
For the year ended December 31, 2019	12,708
For the year ended December 31, 2020	2,009
For the year ended December 31, 2021	1,544

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Debt

3 Months Ended

Mar. 31, 2017

Debt Disclosure [Abstract]

Debt

Debt

6.875% Senior Secured Notes

The carrying value and fair value of the Company's debt is as follows (in thousands):

	March 31, 2017					December 31, 2016
	Carrying Amount			Fair Value		Carrying Amount			Fair Value
6.875% Senior Secured Notes, $465.0 million par	$	462,141		$	480,113	$	461,899		$	466,628
Debt issuance costs	(6,958		)	—		(7,546		)	—
Total	$	455,183		$	480,113	$	454,353		$	466,628

The fair value of the Company's 6.875% Senior Secured Notes is based upon the value of such debt in the secondary market.

The Company's 6.875% Senior Secured Notes would be categorized as Level 2 in the fair value hierarchy if they were required to be recorded at fair value.

On March 10, 2015, the Company entered into a purchase agreement with Jefferies LLC, as initial purchaser (the “Initial Purchaser”), pursuant to which the Company agreed to sell, and the Initial Purchaser agreed to purchase, $500.0 million aggregate principal amount of 6.875% Senior Secured Notes (the “6.875% Senior Secured Notes”), pursuant to an indenture dated March 13, 2015 (the “6.875% Indenture”), in a private offering exempt from registration under the Securities Act of 1933, as amended (the "Securities Act"). The 6.875% Senior Secured Notes were resold by the Initial Purchaser to qualified institutional buyers in reliance on Rule 144A and Regulation S under the Securities Act.

The 6.875% Senior Secured Notes mature on March 15, 2020 and bear interest at a rate of 6.875% per year, payable on March 15 and September 15 of each year, beginning on September 15, 2015. The 6.875% Senior Secured Notes were issued at 98.962% with net proceeds (before fees and expenses) of $494.8 million and a yield to maturity of 7.083%.

On March 13, 2015, KCG and certain subsidiary guarantors (the "6.875% Guarantors") under the 6.875% Indenture, fully and unconditionally guaranteed on a joint and several basis the 6.875% Senior Secured Notes. The 6.875% Senior Secured Notes and the obligations under the 6.875% Indenture are currently secured by pledges of all of the equity interests in each of KCG’s and the 6.875% Guarantors’ existing and future domestic subsidiaries (but limited to 66% of the voting equity interests of controlled foreign company subsidiaries and excluding equity interests in regulated subsidiaries to the extent that such pledge would have a material adverse regulatory effect or is not permitted by applicable law) and security interests in substantially all other tangible and intangible assets of KCG and the 6.875% Guarantors, in each case subject to customary exclusions; provided, however, that if in the future KCG or any of the 6.875% Guarantors enter into certain first lien obligations (as described in the 6.875% Indenture) the collateral agent is authorized by the holders of the 6.875% Senior Secured Notes to enter into an Intercreditor Agreement pursuant to which the lien securing the 6.875% Senior Secured Notes would be contractually subordinated to the lien securing such first lien obligations, to the extent of the value of the collateral securing such obligations. The 6.875% Senior Secured Notes are effectively subordinated to any existing and future indebtedness that is secured by assets that do not constitute collateral under the 6.875% Senior Secured Notes to the extent of the value of such assets. All of the 6.875% Guarantors are wholly-owned subsidiaries of KCG.

On or after March 15, 2017, KCG may redeem all or a part of the 6.875% Senior Secured Notes upon not less than 30 nor more than 60 days’ notice, at the redemption prices (expressed as percentages of principal amount) set forth below plus accrued and unpaid interest on the 6.875% Senior Secured Notes redeemed, to the applicable redemption date, if redeemed during the 12-month period beginning on March 15 of the years indicated below:

Year	Percentage
2017	103.438	%
2018	101.719	%
2019 and thereafter	100.000	%

The 6.875% Indenture contains customary affirmative and negative covenants, including limitations on indebtedness, liens, hedging agreements, investments, loans and advances, asset sales, mergers and acquisitions, dividends, transactions with affiliates, prepayments of other indebtedness, restrictions on subsidiaries, and issuance and repurchases of capital stock. As of March 31, 2017, the Company was in compliance with these covenants.

If at any time the 6.875% Senior Secured Notes are rated investment grade by Moody’s Investors Service, Inc. and Standard & Poor’s Ratings Group and no default or event of default has occurred and is continuing under the 6.875% Indenture, certain of the restrictive covenants will be suspended and will not apply to KCG or its restricted subsidiaries; provided, however, that such covenants will be reinstated if the 6.875% Senior Secured Notes subsequently cease to be rated or are no longer assigned an investment grade rating by both rating agencies.

The 6.875% Senior Secured Notes and the guarantee of the 6.875% Senior Secured Notes have not been registered under the Securities Act or the securities laws of any other jurisdiction and have no registration rights and may not be offered or sold in the United States absent registration or an applicable exemption from registration requirements.

The Company has determined that the terms of the 6.875% Senior Secured Notes do not give rise to a bifurcatable derivative instrument under GAAP.

The Company incurred issuance costs of approximately $12.6 million in connection with the issuance of the 6.875% Senior Secured Notes. The issuance costs are recorded, net, within Debt on the Consolidated Statements of Financial Condition and are being amortized as interest expense over the remaining term of the 6.875% Senior Secured Notes. Including issuance costs and original issue discount, the 6.875% Senior Secured Notes had an effective yield of 7.590%. Of the above mentioned costs, $11.3 million was paid to a related party. See Footnote 11 "Related Parties" for additional information relating to financing and advising activities.

In the first quarter of 2016, the Company repurchased $35.0 million par value of 6.875% Senior Secured Notes in the open market for $31.2 million (including interest owed). The Company recorded a $3.7 million pre-tax gain within Investment income and other, net on the Consolidated Statements of Operations as a result of these repurchases. The gain on repurchase was net of accelerated original issue discount of $0.3 million and accelerated debt issuance costs of $0.7 million.

Revolving Credit Agreement

On June 5, 2015, KCG Americas LLC ("KCGA"), a wholly-owned broker dealer subsidiary of KCG, as borrower, and KCG, as guarantor, entered into a credit agreement (the "KCGA Facility Agreement”) with a consortium of banks. The KCGA Facility Agreement replaced the prior KCGA credit agreement, dated July 1, 2013, which was terminated as of June 5, 2015.

The KCGA Facility Agreement comprises two classes of revolving loans in a total aggregate committed amount of $355.0 million, including a swingline facility with a $50.0 million sub-limit, subject to two borrowing bases (collectively, the “KCGA Revolving Facility”): Borrowing Base A and Borrowing Base B (limited to a maximum loan amount of $115.0 million). The KCGA Revolving Facility also provides for future increases of the revolving credit facility of up to $145.0 million to a total of $500.0 million on certain terms and conditions.

Borrowings under the KCGA Revolving Facility bear interest, at the borrower's option, at a rate based on the federal funds rate (“Base Rate Loans”) or based on LIBOR (“Eurodollar Loans”), in each case plus an applicable margin. For each Base Rate Loan, the interest rate per annum is equal to the greater of the federal funds rate or an adjusted one-month LIBOR rate plus (a) for each Borrowing Base A loan, a margin of 1.50% per annum and (b) for each Borrowing Base B loan, a margin of 2.50% per annum. For each Eurodollar Loan, the interest rate per annum is equal to an adjusted LIBOR rate corresponding to an interest period of one, two or three months plus (a) for each Borrowing Base A loan, a margin of 1.50% per annum and (b) for each Borrowing Base B loan, a margin of 2.50% per annum. As of both March 31, 2017 and December 31, 2016, there were no outstanding borrowings under the KCGA Facility Agreement.

The proceeds of the Borrowing Base A loans may be used solely to finance the purchase and settlement of securities. The proceeds of Borrowing Base B loans may be used solely to fund clearing deposits with the National Securities Clearing Corporation ("NSCC").

KCGA is charged a commitment fee at a rate of 0.40% per annum on the average daily amount of the unused portion of the KCGA Facility Agreement.

The loans under the KCGA Facility Agreement will mature on June 5, 2017. The KCGA Revolving Facility is fully and unconditionally guaranteed on an unsecured basis by KCG and, to the extent elected by KCGA, any of its or KCG’s other subsidiaries. It is secured by first-priority pledges of and liens on certain eligible securities, subject to applicable concentration limits, in the case of Borrowing Base A loans, and by first-priority pledges of and liens on the right to the return of certain eligible NSCC margin deposits, in the case of Borrowing Base B loans.

The KCGA Facility Agreement includes customary affirmative and negative covenants, including limitations on indebtedness, liens, hedging agreements, investments, loans and advances, asset sales, mergers and acquisitions, dividends, transactions with affiliates, restrictions on subsidiaries, issuance of capital stock, negative pledges and business activities. It contains financial maintenance covenants establishing a minimum total regulatory capital for KCGA, a maximum total asset to total regulatory capital ratio for KCGA, a minimum excess net capital limit for KCGA, a minimum liquidity ratio for KCGA, and a minimum tangible net worth threshold for KCGA. As of March 31, 2017, the Company and KCGA were in compliance with these covenants.

The KCGA Facility Agreement also contains events of default customary for facilities of its type, including: nonpayment of principal, interest, fees and other amounts when due, inaccuracy of representations and warranties in any material respect; violation of covenants; cross-default and cross-acceleration to material indebtedness; bankruptcy and insolvency events; material judgments; ERISA events; collateral matters; certain regulatory matters; and a “change of control”; subject, where appropriate, to threshold, notice and grace period provisions.

In connection with the KCGA Revolving Facility, the Company incurred issuance costs of $1.7 million which are recorded within Other assets on the Consolidated Statements of Financial Condition and are being amortized as interest expense over the term of the facility.

The Company recorded expenses with respect to its Debt as follows (in thousands):

	For the three months ended March 31,
	2017		2016
Interest expense	$	8,234	$	8,417
Amortization of debt issuance costs (1)	795		821
Commitment fee (2)	354		359
Accelerated amortization of debt issuance costs (3)	—		738
Accelerated interest expense on repurchase of debt (3)	—		298
Total	$	9,383	$	10,633

⁽¹⁾  Included within Interest expense on the Consolidated Statements of Operations.

⁽²⁾  Included within Other expense on the Consolidated Statements of Operations.

⁽³⁾  In conjunction with the repurchase of debt in the open market, the Company accelerated a prorated portion of its original issue discount and capitalized debt issuance costs. These costs have been netted against the gain on repurchase within Investment income and other, net on the Consolidated Statements of Operations for the three months ended March 31, 2016.

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Related Parties

3 Months Ended

Mar. 31, 2017

Related Party Transactions [Abstract]

Related Parties

Related Parties

The Company interacts with Jefferies LLC, who is the beneficial owner of more than 10 percent of the outstanding KCG Class A Common Stock. The Company also has trading and other activities with certain investees for which it accounts for under the equity method of accounting or accounted for under the equity method at any time during the relevant accounting period. Each is considered a related party for the applicable periods. See Footnote 8 "Investments" for the carrying value of these investees at March 31, 2017 and December 31, 2016 and for the Company's income with respect to its equity earnings from these investees for the three months ended March 31, 2017 and 2016.

As noted in Footnote 8 "Investments", in 2016, the Company sold substantially all of its investment in Bats, which it accounted for under the equity method. As a result of the sales, Bats is no longer accounted for under the equity method, and beginning in 2017, Bats is no longer considered a related party.

The Company earns revenues, incurs expenses and maintains balances with these related parties or their affiliates in the ordinary course of business. As of the date and period indicated below, the Company had the following balances and transactions with its related parties or their affiliates (in thousands):

	For the three months ended March 31,
Statements of Operations	2017		2016
Revenues
Commissions and fees	$	1,868	$	6,663
Trading revenues, net	791		477
Interest, net	119		103
Total revenues from related parties	$	2,778	$	7,243
Expenses
Execution and clearance fees(1)	$	313	$	880
Communications and data processing	5,610		3,206
Payment for order flow	—		5
Collateralized financing interest	86		78
Other expense	—		5
Total expenses incurred with respect to related parties	$	6,009	$	4,174

⁽¹⁾  Represents net volume based fees paid or received by KCG for taking or providing liquidity to related trading venues. Volume based fees will vary period to period based on usage.

Statements of Financial Condition	March 31, 2017		December 31, 2016
Assets
Securities borrowed	$	17,754	$	5,293
Receivable from brokers, dealers and clearing organizations	2,134		2,106
Other assets	16		62,906
Liabilities
Securities loaned	$	2,063	$	2,594
Payable to brokers, dealers and clearing organizations	45		188
Accrued expenses and other liabilities	122		3,708

In the three months ended March 31, 2017 and 2016, the Company paid $19,000 and $36,000, respectively, in fees to Jefferies LLC for acting as broker in connection with the Company's stock buyback program. Such fees are recorded within Treasury stock, at cost in the Consolidated Statements of Financial Condition at both March 31, 2017 and December 31, 2016 and are not included in the above table.

See Footnote 15 "Warrants and Stock Repurchase" for additional information on stock repurchases.

See Footnote 1 “Organization and Description of the Business” for further information regarding the Merger.

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Stock-Based Compensation

3 Months Ended

Mar. 31, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation

Stock-Based Compensation

KCG Equity Incentive Plan

The KCG Holdings, Inc. 2015 Amended and Restated Equity Incentive Plan (the "Amended 2015 Plan") is maintained by the Company for the purpose of granting incentive awards to officers, employees and directors of the Company. As of March 31, 2017, there were approximately 23.2 million shares authorized for issuance under the Amended 2015 Plan, of which approximately 13.6 million shares are available for grant (subject to adjustment as provided under the Amended 2015 Plan).

The Amended 2015 Plan is administered by the Compensation Committee of the Company's Board of Directors, and allows for the grant of stock options, stock appreciation rights ("SARs"), restricted stock, RSUs and cash-based awards (collectively, the “awards”), as defined by the Amended 2015 Plan. In addition to overall limitations on the aggregate number of awards that may be granted, the Amended 2015 Plan also limits the number of awards that may be granted to a single individual.

Restricted Shares and Restricted Stock Units

The Company has historically awarded RSUs to eligible officers, employees and directors as a component of annual incentive compensation ("Annual Equity Awards"), and has also made off-cycle grants of RSUs for purposes of one-time, special or retention awards ("Off-Cycle Grants"). The majority of RSUs that have been granted by the Company vest ratably over three years and are subject to accelerated vesting, or continued vesting, following the grantee’s termination of employment, in accordance with the applicable award documents and employment agreements between the Company and the grantee.

RSUs granted as Annual Equity Awards provide for the continued vesting of such RSUs following a voluntary resignation of employment, subject to the grantee's ongoing compliance with non-competition and non-solicitation requirements through the duration of the vesting period. As such, the Annual Equity Awards are considered not to have a service condition from an expense perspective. The Company recognizes the expense associated with the RSUs expected to be granted by the Company early in the following year for the current year's annual incentive compensation in the current year.

The Company measures compensation expense related to Off-Cycle Grants based on the fair value of KCG Class A Common Stock at the date of grant. When accruing compensation expense over the duration of a performance year prior to the grant of Annual Equity Awards for that year, the Company accrues compensation expense based on the estimated value of such future awards. For example, prior to granting the RSUs that are expected to be awarded by the Company in early 2018 as a component of annual incentive compensation for the 2017 performance year, the Company will accrue compensation expense for such awards over the year ended December 31, 2017, based on the estimated value of such awards. The amount accrued during the year for Annual Equity Awards is included in Accrued compensation expense on the Consolidated Statements of Financial Condition.

Compensation expense relating to RSUs, which is primarily recorded in Employee compensation and benefits, and the corresponding income tax benefit, which is recorded in Income tax (benefit) expense on the Consolidated Statements of Operations are presented in the following table (in thousands):

	For the three months ended March 31,
	2017		2016
Stock award compensation expense	$	2,438	$	17,053
Income tax benefit	926		6,480

The following table summarizes restricted awards activity for the three months ended March 31, 2017 (awards in thousands):

	Restricted Stock Units
	Number of Units		Weighted- Average Grant date Fair Value
Outstanding at December 31, 2016	5,563		$	11.25
Granted	800		14.27
Vested	(2,634	)	11.19
Forfeited	(72	)	12.10
Outstanding at March 31, 2017	3,657		$	11.93

There was $5.6 million of unamortized compensation related to unvested RSUs at March 31, 2017 that are related to Off-Cycle Grants. The cost of these unvested RSUs is expected to be recognized over a weighted average life of 1.6 years.

Stock Options and Stock Appreciation Rights

The Company’s policy is to grant options for the purchase of shares of KCG Class A Common Stock and SARs to purchase or receive the cash value of shares of KCG Class A Common Stock. The stock options and SARs outstanding as of the date hereof have each been granted with an exercise price not less than the market value of KCG Class A Common Stock on the grant date and generally vest ratably over a three year period and expire on the fifth or tenth anniversary of the grant date, pursuant to the terms of the applicable award agreement. Like RSUs, stock options and SARs are subject to accelerated vesting, or continued vesting following certain termination circumstances, in accordance with the applicable award agreements and employment agreements between the Company and the grantee. The Company issues new shares upon stock option exercises by its employees and directors, and may either issue new shares or provide a cash payment upon SARs exercises by its employees.

The Company estimates the fair value of each stock option and SAR granted as of its respective grant date using the Black-Scholes option-pricing model. The principal assumptions utilized in valuing stock options and SARs and the methodology for estimating the inputs to such model include: 1) risk-free interest rate, the estimate of which is based on the yield of U.S. zero coupon securities with a maturity equal to the expected life of the stock option or SAR; 2) expected volatility, the estimate of which is based on several factors including implied volatility of market-traded stock options on the Company’s common stock on the grant date and the volatility of the Company’s common stock; and 3) expected option or SAR life, the estimate of which is based on internal studies of historical experience and projected exercise behavior based on different employee groups and specific stock option and SAR characteristics, including the effect of employee terminations. There were no stock options or SARs granted during the three months ended March 31, 2017 or 2016.

Compensation expense relating to stock options and SARs, all of which was recorded in Employee compensation and benefits, as well as the corresponding income tax (benefit) expense, which is recorded in Income tax expense on the Consolidated Statements of Operations are as follows (in thousands):

	For the three months ended March 31,
	2017		2016
Stock option and SAR compensation expense	$	122	$	134
Income tax benefit	46		51

The following table summarizes stock option and SAR activity and stock options exercisable for the three months ended March 31, 2017 (awards in thousands):

	Number of Stock Awards		Weighted- Average Exercise Price		Aggregate Intrinsic Value		Weighted- Average Remaining Life (years)
Outstanding at December 31, 2016 (1)	6,298		$	18.88
Granted	—		—
Exercised	(337	)	8.24
Forfeited or expired	(94	)	53.56
Outstanding at March 31, 2017 (1)	5,867		$	19.03	$	14,269	2.23
Exercisable at March 31, 2017	4,492		$	17.75	$	14,269	1.69
Available for future grants at March 31, 2017 (2)	13,630

⁽¹⁾ Includes 1.7 million SARs.

⁽²⁾ Represents shares available for grant of options, SARs, RSUs and other awards under the Amended 2015 Plan.

The aggregate intrinsic value is the amount by which the closing price of KCG Class A Common Stock exceeds the exercise price of the stock options or SARs, as applicable, multiplied by the number of shares underlying such award. The total intrinsic value and cash received from stock options exercised during the three months ended March 31, 2017 is $2.2 million and $2.8 million, respectively. There were no stock options or SARs exercised during the three months ended March 31, 2016.

There is $0.5 million of unamortized compensation related to unvested stock options at March 31, 2017. The cost of these unvested awards is expected to be recognized over a weighted average life of 1.25 years.

Incentive units

Prior to the 2013 Mergers, GETCO awarded deferred compensation to its employees in the form of incentive units that generally vested over time. The value of these incentive units was determined at the date of grant based on the estimated enterprise value of GETCO and the amount expensed was determined based on this valuation multiplied by the percent vested. In connection with the 2013 Mergers, all outstanding unvested incentive units vested and were converted into units based on the applicable exchange ratio of GETCO units to KCG Class A Common Stock. The units are marked to the current stock price of KCG Class A Common Stock at the end of each period with the resulting change in the liability reflected as either an expense or benefit included in Employee compensation and benefits on the Consolidated Statements of Operations. Given that the units vested in connection with the 2013 Mergers, the Company fully amortized the costs associated with these units as of June 30, 2013. Deferred compensation payable at March 31, 2017 and December 31, 2016 related to incentive units were $2.7 million and $2.3 million, respectively, and is included in Accrued compensation expense on the Consolidated Statements of Financial Condition.

The following is a summary of the changes in the incentive units for the three months ended March 31, 2017 (units in thousands):

	Vested
Incentive units at December 31, 2016	16
Issued	—
Vested	(1	)
Exercised	—
Canceled	—
Incentive units at March 31, 2017	15

Compensation expense (benefit) related to the Incentive units which are recorded within Employee compensation and benefits on the Consolidated Statements of Operations are as follows (in thousands):

	For the three months ended March 31,
	2017		2016
Incentive units	$	437	$	(77	)

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Income Taxes

3 Months Ended

Mar. 31, 2017

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The Company and its subsidiaries will file a consolidated federal income tax return as well as combined state income tax returns in certain jurisdictions. In other jurisdictions, the Company and its subsidiaries will file separate company state and local income tax returns.

The Company’s effective tax rate was a benefit of 894% on a pre-tax loss for the three months ended March 31, 2017. This rate differed from the federal statutory rate of 35% primarily due to the recognition of $3.5 million of excess tax benefits for stock based compensation awards that vested or were exercised in the first quarter of 2017, offset, in part, by state and local taxes, and the effect of nondeductible expenses. The Company’s effective tax rate of 38.0% for the three months ended March 31, 2016 differed from the federal statutory rate of 35% primarily due to state and local taxes and the effect of nondeductible expenses including certain compensation and meals and entertainment. As noted in footnote 2 "Significant Accounting Policies", effective January 1, 2017, the Company adopted a new ASU that requires excess tax benefits or deficiencies to be recorded as income tax benefit or expense in the period in which they are realized.

Deferred income taxes reflect the net tax effects of temporary differences between the financial reporting and tax bases of assets and liabilities and are measured using the enacted tax rates and laws that will be in effect when such differences are expected to reverse. Valuation allowances recorded on the balance sheet dates are necessary in cases where management believes that it is more likely than not that some portion or all of the deferred tax assets will not be realized.

As of March 31, 2017, the Company is subject to U.S. Federal income tax examinations for the tax years 2013 through 2016, and to non-U.S. income tax examinations for the tax years 2007 through 2016. In addition, the Company is subject to state and local income tax examinations in various jurisdictions for the tax years 2007 through 2016. The final outcome of these examinations is not yet determinable. However, the Company anticipates that adjustments to the unrecognized tax benefits, if any, will not result in a material change to the results of operations or financial condition.

At March 31, 2017, the Company had $5.3 million of unrecognized tax benefits, all of which would affect the Company's effective tax rate if recognized. At December 31, 2016, the Company had $5.1 million of unrecognized tax benefits, all of which would affect the Company’s effective tax rate if recognized.

The Company's policy for recording interest and penalties associated with audits is to record such items as a component of income or loss before income taxes. Penalties, if any, are recorded in Other expenses and interest paid or received is recorded in Debt interest expense and Interest, net, respectively, on the Consolidated Statements of Operations.

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Accumulated Other Comprehensive Income

3 Months Ended

Mar. 31, 2017

Equity [Abstract]

Accumulated Other Comprehensive Income

Accumulated Other Comprehensive Income

The following table presents changes in Accumulated other comprehensive (loss) income, net of tax by component for the three months ended March 31, 2017 and 2016 (in thousands):

	Unrealized Gains (Losses) on Available-for-Sale Securities			Foreign Currency Translation Adjustments			Total
Balance, December 31, 2016	$	3,286		$	(1,039	)	$	2,247
Other comprehensive income	170			437			607
Amount reclassified from Available-for-sale securities, net of tax	(2,956		)	—			(2,956		)
Balance March 31, 2017	$	500		$	(602	)	$	(102	)

	Unrealized Gains on Available-for-Sale Securities		Foreign Currency Translation Adjustments			Total
Balance, December 31, 2015	$	150	$	200		$	350
Other comprehensive income (loss)	68		(133		)	(65		)
Balance March 31, 2016	$	218	$	67		$	285

The following table presents the effects of reclassifications out of Accumulated Other Comprehensive (Loss) Income and into the Consolidated Statements of Operations for the three months ended March 31, 2017 (in thousands):

Details about Accumulated Other Comprehensive Income Components	Amounts Reclassified from Other Comprehensive Income			Affected Line Item in the Consolidated Statement of Operations where Net Income is Presented
Available-for-sale securities:
Reclassification of unrealized net gains	4,767			Investment income and other, net
Related income tax expense	(1,811		)	Income tax (benefit) expense
	$	2,956		Net of tax

The reclassification is a result of the Company's sale of its remaining shares of Bats, which was accounted for as an available for sale security prior to its sale. See Footnote 8 "Investments" for additional information on the reclassification.

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Warrants and Stock Repurchases

3 Months Ended

Mar. 31, 2017

Equity [Abstract]

Warrants and Stock Repurchases

Warrants and Stock Repurchases

Warrants

As a portion of the consideration in the 2013 Mergers, former GETCO unitholders received, in addition to KCG Class A Common Stock, 24.3 million Class A, Class B and Class C Warrants, which were issued in accordance with the Warrant Agreement, dated July 1, 2013, between KCG and Computershare Shareowner Services LLC (the “Warrant Agreement”) and which are subject to the terms and conditions of the Warrant Agreement.

The Warrant Agreement includes various anti-dilution and similar provisions that require adjustments to the exercise prices of the Class A, Class B and Class C Warrants and/or the number of shares of KCG Class A Common Stock issuable upon exercise of the Warrants upon certain events and actions taken by the Company, including the Company’s repurchase of KCG Class A Common Stock through a public tender offer.

As a result of the Company's "modified dutch auction" tender offer ("Tender Offer") in the second quarter of 2015, the exercise price of each of the Class A, Class B and Class C Warrants was adjusted in accordance with the terms of the Warrant Agreement. All other terms of the Warrants remained the same.

The adjusted exercise price for each class of Warrants and the activity for the three months ended March 31, 2017 were as follows (Warrants in thousands):

	Class A			Class B			Class C
Original Exercise Price	$	12.00		$	13.50		$	15.00
Adjusted Exercise Price	$	11.70		$	13.16		$	14.63
Initial term (years)	4			5			6
Expiration	7/1/2017			7/1/2018			7/1/2019
										Total
Warrants - Outstanding at December 31, 2016	2,026			2,069			2,087			6,182
Exercised	(545		)	(44		)	(44		)	(633	)
Repurchased	(359		)	(359		)	(359		)	(1,077	)
Warrants - Outstanding at March 31, 2017	1,122			1,666			1,684			4,472

The Company repurchased, from GA, 1.1 million Warrants for $2.9 million in the first quarter of 2017. During the first quarter of 2016, the Company repurchased 1.5 million Warrants for $1.0 million.

See Footnote 8 "Investments" and Footnote 11 "Related Parties" for more information on warrant repurchases from related parties and not under the Company's Board approved program.

Stock Repurchases

During the first quarter of 2017, the Company repurchased 0.9 million shares of KCG Class A Common Stock for $13.3 million under the Company's Board approved program. As of March 31, 2017, approximately $136.8 million in authority remained under the current share repurchase program, which is subject to the restrictive covenants in the 6.875% Senior Secured Notes Indenture.

During the first quarter of 2016, the Company repurchased 1.8 million shares of KCG Class A Common Stock for $20.5 million.

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Earnings Per Share

3 Months Ended

Mar. 31, 2017

Earnings Per Share [Abstract]

Earnings Per Share

Earnings Per Share

Basic earnings or loss per common share (“EPS”) has been calculated by dividing net income or loss by the weighted average shares of KCG Class A Common Stock outstanding during each respective period. Diluted EPS reflects the potential reduction in EPS using the treasury stock method to reflect the impact of common stock equivalents if stock options, SARs and Warrants were exercised and restricted awards were to vest.

The number of such RSUs, options, Warrants and SARs excluded from the EPS calculation was approximately 3.8 million and 23.8 million for the three months ended March 31, 2017 and 2016, respectively. Such RSUs, options, Warrants and SARs were excluded from the EPS calculation as their inclusion would have an anti-dilutive impact on the EPS calculation. The computation of diluted shares can vary among periods due in part to the change in the average price of the KCG Class A Common Stock. See Footnote 2 "Significant Accounting Policies" for more information related to a recently adopted ASU affecting the impact of excess tax benefits in calculating diluted EPS.

The following is a reconciliation of the numerators and denominators of the basic and diluted earnings per share computations for the three months ended March 31, 2017 and 2016 (in thousands, except per share amounts):

	For the three months ended March 31,
	2017				2016
	Numerator  / net income		Denominator /     shares		Numerator  / net income		Denominator /  shares
Income and shares used in basic calculations	$	3,212	66,306		$	37,165	88,458
Effect of dilutive stock based awards
Restricted awards and warrants			800				992
Stock options and SARs			536				155
Income and shares used in diluted calculations	$	3,212	67,642		$	37,165	89,605
Basic earnings per common share			$	0.05			$	0.42
Diluted earnings per common share			$	0.05			$	0.41

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Significant Clients

3 Months Ended

Mar. 31, 2017

Risks and Uncertainties [Abstract]

Significant Clients

Significant Clients

The Company considers significant clients to be those clients who account for 10% or more of the total U.S. equity market making dollar value traded by the Company. No clients accounted for more than 10% of the Company’s U.S. equity dollar value traded during the three months ended March 31, 2017 and 2016.

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Commitments and Contingent Liabilities

3 Months Ended

Mar. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingent Liabilities

Commitments and Contingent Liabilities

Legal Proceedings

In the ordinary course of business, the nature of the Company’s business subjects it to claims, lawsuits, regulatory examinations or investigations and other proceedings. The Company and its subsidiaries are subject to several of these matters at the present time. Given the inherent difficulty of predicting the outcome of litigation and regulatory matters, particularly in regulatory examinations or investigations or other proceedings in which substantial or indeterminate damages or fines are sought, or where such matters are in the early stages, the Company cannot estimate losses or ranges of losses for such matters where there is only a reasonable possibility that a loss may be incurred. In addition, there are numerous factors that result in a greater degree of complexity in class-action lawsuits as compared to other types of litigation. Due to the many intricacies involved in class-action lawsuits particularly in the early stages of such matters, obtaining clarity on a reasonable estimate is difficult which may call into question its reliability. There can be no assurance that these matters will not have a material adverse effect on the Company’s results of operations in any future period, and a material judgment, fine or sanction could have a material adverse impact on the Company’s financial condition and results of operations. However, it is the opinion of management, after consultation with legal counsel that, based on information currently available, the ultimate outcome of these matters will not have a material adverse impact on the business, financial condition or operating results of the Company although they might be material to the operating results for any particular reporting period. The Company carries directors’ and officers’ liability insurance coverage for potential claims, including securities actions, against the Company, Knight and GETCO and their respective directors and officers.

Other Legal and Regulatory Matters

The Company owns subsidiaries including regulated entities that are subject to extensive oversight under federal, state and applicable international laws as well as self-regulatory organization ("SRO") rules. Changes in market structure and the need to remain competitive require constant changes to the Company's systems and order handling procedures. The Company makes these changes while continuously endeavoring to comply with many complex laws and rules. Compliance, surveillance and trading issues common in the securities industry are monitored by, reported to, and/or reviewed in the ordinary course of business by the Company's regulators in the U.S. and abroad. As a major order flow execution destination, the Company is named from time to time in, or is asked to respond to a number of regulatory matters brought by U.S. regulators, foreign regulators, SROs, as well as actions brought by private plaintiffs, which arise from its business activities. There has recently been an increased focus by regulators on Anti-Money Laundering and sanctions compliance by broker-dealers and similar entities, as well as an enhanced interest on suspicious activity reporting and transactions involving microcap securities. In addition, there has been an increased focus by Congress, federal and state regulators, SROs and the media on market structure issues, and in particular, high frequency trading, best execution, internalization, ATS manner of operations, market fragmentation and complexity, colocation, access to market data feeds and remuneration arrangements, such as payment for order flow and exchange fee structures. The Company has received information requests from various authorities, including the SEC, requesting, among other items, information regarding these market structure matters, which the Company is in the process of responding.

The Company is currently the subject of various regulatory reviews and investigations by federal, state and foreign regulators and SROs, including the SEC, the U.S. Department of Justice, the Financial Industry Regulatory Authority, Inc. and the Financial Conduct Authority ("FCA"). In some instances, these matters may rise to a disciplinary action and/or a civil or administrative action. For example, the Autorité des Marchés Financiers ("AMF") recently completed an investigation of GETCO’s trading activities on Euronext for the period 2010 to 2012. In a decision, dated July 8, 2016, the AMF's enforcement committee imposed a €400,000 monetary penalty on GETCO which the Company decided not to appeal. The Company fully reserved for the monetary penalty in the second quarter of 2016 and anticipates paying the fine later in 2017.

Capital Leases

The Company enters into capitalized lease obligations related to certain computer equipment. These obligations represent drawdowns under a revolving secured lending facility with a single lender. At March 31, 2017, the obligations have a weighted-average interest rate of 4.42% per annum and are on varying 3-year terms. The carrying amounts of the capital lease obligations approximate fair value and is recorded in Accrued expenses and other liabilities on the Consolidated Statements of Financial Condition. The future minimum payments including interest under the capitalized leases at March 31, 2017 consist of (in thousands):

	Minimum Payments
Nine months ending December 31, 2017	$	5,625
Year ending December 31, 2018	7,272
Year ending December 31, 2019	7,272
Year ending December 31, 2020	1,103
Total	$	21,272

The total interest expense related to capital leases for the three months ended March 31, 2017 and 2016 included in Debt interest expense on the Consolidated Statements Operations is as follows (in thousands):

	For the three months ended March 31,
	2017		2016
Interest expense - Capital leases	$	24	$	24

Operating Leases

The Company leases office space under noncancelable operating leases. Certain office leases contain fixed dollar-based escalation clauses. Rental expense under the office leases was $4.7 million and $6.1 million for the three months ended March 31, 2017 and 2016, respectively, and is included in Occupancy and equipment rentals on the Consolidated Statements of Operations. The Company also subleases certain of its excess capacity to third parties and collects sublease income on such premises. Such income is part of lease loss accruals included within Accrued expenses and other liabilities on the Consolidated Statements of Financial Condition.

The Company leases certain computer and other equipment under noncancelable operating leases. As of March 31, 2017, future minimum rental commitments under all noncancelable office, computer and equipment leases (“Gross Lease Obligations”), and sublease income were as follows (in thousands):

	Gross Lease Obligations		Sublease Income		Net Lease Obligations
Nine months ending December 31, 2017	$	22,057	$	4,573	$	17,484
Year ending December 31, 2018	27,978		5,850		22,128
Year ending December 31, 2019	25,031		5,229		19,802
Year ending December 31, 2020	23,310		4,056		19,254
Year ending December 31, 2021	22,771		4,039		18,732
Thereafter through December 31, 2031	154,234		10,096		144,138
Total	$	275,381	$	33,843	$	241,538

Contract Obligations

During the normal course of business, the Company collateralizes certain leases or other contractual obligations through letters of credit or segregated funds held in escrow accounts. At March 31, 2017, the Company had provided letters of credit for $10.2 million, collateralized by cash, as a guarantee for several of its lease obligations and for a trading JV. In the ordinary course of business, KCG also has provided, and may provide in the future, unsecured guarantees with respect to the payment obligations of certain of its subsidiaries under trading, repurchase, financing and stock loan arrangements, as well as under certain leases.

Guarantees

The Company is a member of exchanges that trade and clear futures contracts. Associated with its memberships, the Company may be required to pay a proportionate share of the financial obligations of another member who may default on its obligations to the exchange. Although the rules governing different exchange memberships vary, in general the Company’s guarantee obligations would arise only if the exchange had previously exhausted its resources. In addition, any such guarantee obligation would be apportioned among the other nondefaulting members of the exchange. Any potential contingent liability under these membership agreements cannot be estimated. The Company has not recorded any contingent liability in the financial statements for these agreements and management believes that any potential requirement to make payments under these agreements is remote.

There were no compensation guarantees at March 31, 2017 or December 31, 2016 that extended beyond the respective year end.

Representations and Warranties

In the normal course of its operations, the Company enters into contracts that contain a variety of representations and warranties which provide general indemnifications. The Company’s maximum exposure under these arrangements is unknown, as this would involve future claims that may be made against the Company that have not yet occurred. However, based on experience, the Company believes the risk of significant loss is minimal.

Urban, the reverse mortgage origination and securitization business that was sold by KCG in November 2013, has advised KCG that it will seek indemnification from KCG for losses on certain loans that were underwritten prior to KCG’s disposition of Urban. This potential obligation relates to approximately 40 loans which have been identified as either loans pursuant to which Urban was required to provide an indemnification to the U.S. Department of Housing and Urban Development (“HUD”) in the event the loans sustained losses or as not qualifying for HUD insurance. Based on information currently available, KCG estimates that its maximum exposure to losses with respect to reimbursing Urban for any potential losses on these loans will not exceed $10.1 million. The Company has not recorded any liabilities related to these potential losses as of March 31, 2017.

The activity in the liability accounts related to the Company’s lease losses and lease terminations for its U.S. leases are recorded in Accrued expenses and other liabilities on the Consolidated Statements of Financial Condition as follows (in thousands):

	For the three months ended March 31, 2017			For the year ended December 31, 2016
Balance as of beginning of period	$	14,251		$	18,892
Real estate charges incurred	—			390
Payments made, net	(1,566		)	(3,750		)
Other charges	884			(1,281		)
Balance as of end of period	$	13,569		$	14,251

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Financial instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk

3 Months Ended

Mar. 31, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Financial instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk

Derivative Financial Instruments

The Company enters into derivative transactions as part of its trading activities and to manage foreign currency exposure. Cash flows associated with such derivative activities are included in cash flows from operating activities on the Consolidated Statements of Cash Flows.

During the normal course of business, the Company enters into futures contracts. These financial instruments are subject to varying degrees of risks whereby the fair value of the securities underlying the financial instruments may be in excess of, or less than, the contract amount. The Company is obligated to post collateral against certain futures contracts.

The Company has entered into and may continue to enter into International Swaps and Derivative Association, Inc. (“ISDA”) master netting agreements with counterparties. Master agreements provide protection in bankruptcy in certain circumstances and, where legally enforceable, enable receivables and payables with the same counterparty to be settled or otherwise eliminated by applying amounts due against all or a portion of an amount due from the counterparty or a third party. The Company may also enter into bilateral trading agreements and other customer agreements that provide for the netting of receivables and payables with a given counterparty as a single net obligation.

Under the ISDA master netting agreements, the Company typically also executes credit support annexes, which provide for collateral, either in the form of cash or securities, to be posted or paid by a counterparty based on the fair value of the derivative receivable or payable based on the rates and parameters established in the credit support annex. In the event of counterparty’s default, provisions of the ISDA master agreement permit acceleration and termination of all outstanding transactions covered by the agreement such that a single amount is owed by, or to, the non-defaulting party. Any collateral posted can be applied to the net obligations, with any excess returned and the collateralized party has a right to liquidate the collateral. Any residual claim after netting is treated along with other unsecured claims in bankruptcy court.

The Company is also a party to clearing agreements with various central clearing parties. Under these arrangements, the central clearing counterparty facilitates settlement between counterparties based on the net payable owed or receivable due and, with respect to daily settlement, cash is generally only required to be deposited to the extent of the net amount. In the event of default, a net termination amount is determined based on the market values of all outstanding positions and the clearing organization or clearing member provides for the liquidation and settlement of the net termination amount among all counterparties to the open derivative contracts.

The following tables summarize the fair value and number of derivative instruments held at March 31, 2017 and December 31, 2016. These instruments include those classified as Financial instruments owned, at fair value, Financial instruments sold, not yet purchased, at fair value, as well as futures contracts and bi-lateral over the counter swaps which are reported within Receivable from brokers, dealers and clearing organizations on the Consolidated Statements of Financial Condition. The fair value of assets/liabilities are shown gross of counterparty netting and cash collateral received and pledged. The following tables also provide information regarding 1) the extent to which, under enforceable master netting agreements, such balances are presented net on the Consolidated Statements of Financial Condition as appropriate under GAAP, and 2) the extent to which other rights of setoff associated with these agreements exist and could have an effect on the Company's financial position (in thousands, except contract amounts):

		March 31, 2017
	Financial Statements	Assets				Liabilities
	Location	Fair Value			Contracts	Fair Value			Contracts
Foreign currency
Futures contracts	Receivable from brokers, dealers and clearing organizations	$	163		364	$	240		438
Forward contracts (1)	Financial instruments owned, at fair value	—			—	598			1
Equity
Futures contracts	Receivable from brokers, dealers and clearing organizations	1,594			7,047	2,978			7,326
Swap contracts	Receivable from brokers, dealers and clearing organizations	—			—	195			2
Listed options	Financial instruments owned/sold, not yet purchased, at fair value	12,299			75,294	35,835			76,347
Fixed income
Futures contracts	Receivable from brokers, dealers and clearing organizations	2,545			4,234	5,678			4,038
Commodity
Futures contracts	Receivable from brokers, dealers and clearing organizations	45,889			23,531	45,697			25,762
Gross derivative assets/liabilities, before netting		$	62,490			$	91,221
Less: Legally enforceable master netting agreements
Exchange traded (3)		(49,841		)		(54,593		)
Bi-lateral over-the-counter (4)		—				(195		)
Net amounts per Consolidated Statement of Financial Condition (5)		$	12,649			$	36,433

		December 31, 2016
	Financial Statements	Assets				Liabilities
	Location	Fair Value			Contracts	Fair Value			Contracts
Foreign currency
Futures contracts	Receivable from brokers, dealers and clearing organizations	$	360		1,285	$	1,663		6,495
Forward contracts (1)	Financial instruments owned, at fair value	30			1	—			—
Equity
Futures contracts	Receivable from brokers, dealers and clearing organizations	1,451			2,056	1,644			2,944
Swap contracts	Receivable from brokers, dealers and clearing organizations	16			1	154			1
Listed options	Financial instruments owned/sold, not yet purchased, at fair value	19,100			85,797	12,961			90,063
Forward contracts(2)	Accrued expenses and other liabilities	—			—	1,599			1
Fixed income
Futures contracts	Receivable from brokers, dealers and clearing organizations	4,627			8,590	5,541			5,165
Commodity
Futures contracts	Receivable from brokers, dealers and clearing organizations	86,393			31,800	86,100			31,906
Gross derivative assets/liabilities, before netting		$	111,977			$	109,662
Less: Legally enforceable master netting agreements
Exchange traded (3)		(92,572		)		(94,948		)
Bi-lateral over-the-counter (4)		—				(154		)
Net amounts per Consolidated Statement of Financial Condition (5)		$	19,405			$	14,560

⁽¹⁾  The foreign currency forward contract represents a net investment hedge and is designated as a hedging instrument.

⁽²⁾  The equity forward contract represents a liability to deliver shares of Bats common stock to General Atlantic as described in Footnote 8 "Investments".

⁽³⁾  Exchange traded instruments comprise futures contracts.

⁽⁴⁾  Bi-lateral over-the-counter instruments comprise swaps and forward contracts.

⁽⁵⁾  The Company has not received or pledged additional collateral under master netting agreements and or other credit support agreements that is eligible to be offset beyond what is offset in the Consolidated Statements of Financial Condition.

The fair value of listed options and forward contracts in the tables above are classified as Level 1 and Level 2 in the fair value hierarchy, respectively. The fair value of futures contracts and swaps in the tables above are classified as Level 1 and Level 2 in the fair value hierarchy, respectively.

The following table summarizes the gains and losses included in the Consolidated Statements of Operations for the three months ended March 31, 2017 and 2016.

		Gain (Loss) Recognized
	Financial Statements	For the three months ended March 31,
	Location	2017			2016
Derivative instruments not designated as hedging instruments:
Foreign currency
Futures contracts	Trading revenues, net	$	2,712		$	312
Equity
Futures contracts	Trading revenues, net	(7,998		)	8,922
Swap contracts	Trading revenues, net	(795		)	1,886
Listed options	Trading revenues, net	(24		)	3,871
Fixed income
Futures contracts	Trading revenues, net	(118		)	6,833
Commodity
Futures contracts	Trading revenues, net	3,750			6,966
		$	(2,473	)	$	28,790
Derivative instruments designated as hedging instruments:
Foreign exchange - forward contract	Accumulated other comprehensive (loss) income	$	(389	)	$	(149	)

Financial instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk

As a market maker in global equities, fixed income, futures, options, commodities and currencies, the majority of the Company’s securities transactions are conducted as principal or riskless principal with broker dealers and institutional counterparties primarily located in the United States. The Company self-clears substantially all of its U.S. equity and option securities transactions. The Company clears a portion of its securities transactions through third party clearing brokers. Foreign transactions are settled pursuant to global custody and clearing agreements with major U.S. banks. Substantially all of the Company’s credit exposures are concentrated with its clearing brokers, broker dealer and institutional counterparties. The Company’s policy is to monitor the credit standing of counterparties with which it conducts business.

Financial instruments sold, not yet purchased, at fair value represent obligations to purchase such securities (or underlying securities) at a future date. The Company may incur a loss if the market value of the securities subsequently increases.

The Company currently has no loans outstanding to any former or current executive officer or director.

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Business Segments

3 Months Ended

Mar. 31, 2017

Segment Reporting [Abstract]

Business Segments

Business Segments

As of March 31, 2017, the Company's operating segments comprised the following: (i) Market Making; (ii) Global Execution Services; and (iii) Corporate and Other.

The Market Making segment principally consists of market making in the cash, futures and options markets across global equities, options, fixed income, currencies and commodities. As a market maker, the Company commits capital on a principal basis by offering to buy securities from, or sell securities to, broker dealers, banks and institutions. The Company engages in principal trading in the Market Making segment direct to clients as well as in a supplemental capacity on exchanges, ECNs and ATSs. The Company is an active participant on all major global equity and futures exchanges and also trades on substantially all domestic electronic options exchanges. As a complement to electronic market making, the cash trading business handles specialized orders and also transacts on the OTC Bulletin Board marketplaces operated by the OTC Markets Group Inc. and the AIM.

Results for the Company's former retail U.S. options market making business and DMM business are included in Market Making segment up to the date of its sale in 2016.

The Global Execution Services segment comprises agency-based trading and trading venues, offering execution services in global equities, options, futures and fixed income on behalf of institutions, banks and broker dealers. The Company earns commissions as an agent on behalf of clients as well as between principals to transactions; in addition, the Company will commit capital on behalf of clients as needed. Agency-based, execution-only trading in the segment is done primarily through a variety of access points including: (i) algorithmic trading and order routing in global equities and options; (ii) institutional sales traders executing program, block and riskless principal trades in global equities and ETFs; (iii) a fixed income ECN that also offers trading applications; and (iv) an ATS for U.S. equities.

In September 2016, the Company completed the acquisition of Neonet. Neonet is an independent agency broker and execution specialist based in Stockholm, Sweden. The results of Neonet, beginning on the date of acquisition, are included in this segment.

The Corporate and Other segment contains the Company's investments, principally in strategic trading-related opportunities; manages the deployment of capital across the organization; houses executive management functions; and maintains corporate overhead expenses and all other income and expenses that are not attributable to the Company's other segments. The Corporate and Other segment also contains functions that support the Company’s other segments such as self-clearing services, including stock lending activities.

The Company’s revenues, income (loss) before income taxes (“Pre-tax earnings”) and total assets by segment are summarized in the following table (in thousands):

	Market Making		Global Execution Services		Corporate and Other (1)			Consolidated Total
For the three months ended March 31, 2017:
Revenues	$	174,656	$	70,756	$	9,961		$	255,373
Pre-tax earnings	18,023		1,994		(20,421		)	(404		)
Total assets	5,255,849		1,001,933		(274,353		)	5,983,429
For the three months ended March 31, 2016:
Revenues	$	258,918	$	76,394	$	10,112		$	345,424
Pre-tax earnings	75,489		6,261		(21,785		)	59,965
Total assets	4,999,201		1,020,306		176,791			6,196,298

⁽¹⁾  Amounts shown in the Corporate and Other segment include eliminations of income statement and balance sheet items included in the Company's other segments.

Included in total assets within Market Making and Corporate and Other at March 31, 2016 is $16.4 million and $8.1 million, respectively, related to Assets of businesses held for sale.

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Subsequent Events

3 Months Ended

Mar. 31, 2017

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

As noted in Footnote 1, "Organization and Description of Business", on April 20, 2017, the Company announced that it has reached a definitive agreement for Virtu to acquire all outstanding shares of KCG’s Class A Common Stock for $20.00 per share in cash (the “Merger Consideration”). In addition, at the Effective Time, (i) each stock option of the Company that is outstanding and unexercised immediately before the Effective Time will be cancelled in consideration for the right to receive a cash payment equal to the excess, if any, of the Merger Consideration over the exercise price of such stock option; (ii) each stock appreciation right of the Company that is outstanding and unexercised immediately before the Effective Time will be canceled in consideration for the right to receive a cash payment equal to the excess, if any, of the Merger Consideration over the exercise price of such stock appreciation right; (iii) each restricted share unit of the Company will become fully vested (contingent upon the closing of the Merger) and cancelled and converted into the right to receive the Merger Consideration; and (iv) the right of each holder of a warrant of the Company that is outstanding immediately before the Effective Time to receive shares of KCG Class A Common Stock upon exercise of each such warrant will be converted into the right to receive, upon exercise of each such warrant, a cash payment equal to the excess, if any, of the Merger Consideration over the exercise price of such warrant.

The transaction is expected to be completed in the third quarter of 2017, subject to the approval by KCG’s and Virtu’s stockholders, customary regulatory approvals and the satisfaction of customary closing conditions.

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Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2017

Accounting Policies [Abstract]

Basis of consolidation and form of presentation

Basis of consolidation and form of presentation

The accompanying unaudited Consolidated Financial Statements, prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”), should be read in conjunction with the audited Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016. These unaudited Consolidated Financial Statements include the accounts of the Company and its subsidiaries and reflect all normal and recurring adjustments that are, in the opinion of management, necessary for a fair statement of the results for the interim periods presented. Certain footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to U.S. Securities and Exchange Commission (“SEC”) rules and regulations, although the Company believes that the disclosures herein are adequate to make the information presented not misleading. All significant intercompany transactions and balances have been eliminated. Interim period operating results may not be indicative of the operating results for a full year.

Cash and cash equivalents

Cash and cash equivalents

Cash and cash equivalents include money market accounts, which are payable on demand, and short-term investments with an original maturity of less than 90 days. The carrying amount of such cash equivalents approximates their fair value due to the short-term nature of these instruments. These assets would be categorized as Level 1 in the fair value hierarchy if they were required to be recorded at fair value.

Cash and cash equivalents segregated under federal and other regulations

Cash and cash equivalents segregated under federal and other regulations

The Company maintains custody of customer funds and is obligated by rules and regulations mandated bythe SEC to segregate or set aside cash and/or qualified securities to satisfy these regulations, which have been promulgated to protect customer assets. The amounts recognized as Cash and cash equivalents segregated under federal and other regulations approximate fair value. These assets would be categorized as Level 1 in the fair value hierarchy if they were required to be recorded at fair value.

Market making, sales, trading and execution activities

Payments for order flow represent payments to broker dealer clients, in the normal course of business, for directing their order flow in U.S. equities and, prior to the sale of the retail U.S. options market making business, options to the Company.

Market making, sales, trading and execution activities

Financial instruments owned and Financial instruments sold, not yet purchased relate to market making and trading activities, and include listed and other equity securities, listed equity options and fixed income securities that are recorded on a trade date basis and are reported at fair value. Such financial instruments are netted by their respective long and short positions by CUSIP/ISIN number. Trading revenues, net, which comprises trading gains, net of trading losses on such financial instruments, are also recorded on a trade date basis.

Commissions, which primarily comprise commission equivalents earned on institutional client orders and volume based fees earned from providing liquidity to other trading venues, as well as related expenses, are also recorded on a trade date basis.

The Company’s third party clearing agreements call for payment or receipt of interest income, net of transaction-related interest charged by such clearing brokers, for facilitating the settlement and financing of securities transactions.

Fair value of financial instruments

Fair value of financial instruments

The Company values its financial instruments using a hierarchy of fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs when measuring fair value.

The fair value hierarchy can be summarized as follows:

• Level 1—Valuations based on quoted prices in active markets for identical assets or liabilities that the Company has the ability to access. Since valuations are based on quoted prices that are readily and regularly available in an active market, valuation of these products does not entail a significant degree of judgment.

• Level 2—Valuations based on quoted prices in markets that are not active or for which all significant inputs are observable, either directly or indirectly.

• Level 3—Valuations based on inputs that are unobservable and significant to the overall fair value measurement.

Changes in fair value are recognized in earnings each period for financial instruments that are carried at fair value.

Collateralized agreements and financings

Collateralized agreements and financings

Collateralized agreements consist of securities borrowed. Collateralized financings primarily comprise securities loaned and financial instruments sold under agreements to repurchase.

• Securities borrowed and securities loaned transactions are recorded at the amount of cash collateral advanced or received. Securities borrowed transactions facilitate the securities settlement process and require the Company to deposit cash or other collateral with the lender. Securities loaned transactions help finance the Company’s securities inventory whereby the Company lends stock to counterparties in exchange for the receipt of cash or other collateral from the borrower. In these transactions, the Company receives or posts cash or other collateral in an amount generally in excess of the market value of the applicable securities borrowed or loaned. The Company monitors the market value of securities borrowed or loaned on a daily basis, and obtains additional collateral or refunds excess collateral as necessary.

• Financial instruments sold under agreements to repurchase and other collateralized financings are used to finance inventories of securities and other financial instruments and are recorded at their contractual amount. The Company has entered into bilateral and tri-party term and overnight repurchase and other collateralized financing agreements which bear interest at negotiated rates. The Company receives cash and makes delivery of financial instruments to a custodian who monitors the market value of these instruments on a daily basis. The market value of the instruments delivered must be equal to or in excess of the principal amount loaned under the repurchase agreements plus the agreed upon margin requirement. The custodian may request additional collateral, if appropriate.

Securitization activities

The Company’s securities borrowed, securities loaned, financial instruments sold under agreements to repurchase and other collateralized financings are recorded at amounts that approximate fair value. These items are recorded based upon their contractual terms and are not materially sensitive to shifts in interest rates because they are short-term in nature and are substantially collateralized pursuant to the terms of the underlying agreements. These items would be categorized as Level 2 in the fair value hierarchy if they were required to be recorded at fair value.

Investments

Investments

Investments primarily comprise noncontrolling equity ownership interests in trading-related businesses and are held by the Company's non-broker dealer subsidiaries. These investments are accounted for under the equity method, at cost, or at fair value. The equity method of accounting is used when the Company has significant influence over the operating and financial policies of the investee. Investments are held at cost, less impairment if any, when the investment does not have a readily determined fair value, and the Company is not considered to exert significant influence over operating and financial policies of the investee. Investments that are publicly traded and where the Company does not exert significant influence on operating and financial policies are held at fair value and accounted for as available for sale securities and any unrealized gains or losses are recorded net of tax in Other comprehensive income.

Investments accounted for under the equity method or held at cost are reviewed on an ongoing basis to determine whether the carrying values of the investments have been impaired. If the Company determines that an impairment loss on an investment has occurred due to a decline in fair value or other conditions, the investment is written down to its estimated fair value.

Included in the Company's investments are assets supporting a non-qualified deferred compensation plan for certain employees. This plan provides a return to the participants based upon the performance of various investments. In order to hedge its liability under this plan, the Company generally acquires the underlying investments and holds such investments until the deferred compensation liabilities are satisfied. Changes in value of such investments are recorded in Investment income and other, net, with a corresponding charge or credit to Employee compensation and benefits on the Consolidated Statements of Operations. Deferred compensation investments primarily consist of mutual funds, which are accounted for at fair value.

Goodwill and intangible assets

Goodwill and intangible assets

The Company tests goodwill and intangible assets with an indefinite useful life for impairment annually or when an event occurs or circumstances change that signifies that the carrying amounts may not be recoverable. Specific events and changes that could adversely affect the Company’s assessment of its Goodwill, which is all related to its Market Making reporting unit, include the following factors that are significant inputs into its fair value calculations of its reporting units and drive the Company's revenue and expense assumptions:

• the inability to manage trading strategy performance and grow revenues and earnings;

• changes in market structure, legislative, regulatory or financial reporting rules, including the increased focus by Congress, federal and state regulators, the self-regulatory organizations and the media on market structure issues, and in particular, the scrutiny of high frequency trading, alternative trading systems, market fragmentation, colocation, access to market data feeds, and remuneration arrangements such as payment for order flow and exchange fee structures;

• future changes to the Company’s organizational structure and management;

• the Company’s ability to develop competitive new products and services in a timely manner and the acceptance of such products and services by the Company’s customers and potential customers;

• the Company’s ability to keep up with technological changes;

• the Company’s ability to effectively identify and manage market risk, operational and technology risk, cybersecurity risk, legal risk, liquidity risk, reputational risk, counterparty and credit risk, international risk, regulatory risk, and compliance risk;

• the effects of increased competition and the Company’s ability to maintain and expand market share;

• changes in discount and growth rates used by the Company in its fair value models; and

• the Company's ability to manage its costs.

The Company amortizes intangible assets with finite lives on a straight line basis over their estimated useful lives and tests for recoverability whenever events indicate that the carrying amounts may not be recoverable. The Company capitalizes certain costs associated with the acquisition or development of internal-use software and amortizes the software over its estimated useful life of three years, commencing at the time the software is placed in service.

Payable to customers

Payable to customers

Payable to customers primarily relate to amounts due on cash and margin transactions. Due to their short-term nature, such amounts approximate fair value.

Repurchases of common stock

Repurchases of common stock

The Company may repurchase shares of KCG Class A Common Stock in the open market or through privately negotiated transactions. The Company may structure such repurchases as either a purchase of treasury stock or a retirement of shares. The Company records its purchases of treasury stock, which include shares repurchased in satisfaction of tax withholding obligations upon vesting of restricted awards, at cost as a separate component of stockholders’ equity. The Company may re-issue treasury stock, at average cost, for the acquisition of new businesses and in certain other circumstances. For shares that are retired, the Company records its repurchases at cost, as a reduction in KCG Class A Common Stock for the par value of such retired shares and a reduction in Retained earnings for the balance.

Repurchases of warrants

Repurchases of warrants

As discussed in Footnote 15 "Warrants and Stock Repurchases", in connection with the 2013 Mergers, the Company issued Class A, Class B and Class C warrants to acquire shares of KCG Class A Common Stock ("Warrants"). The Company may repurchase Warrants through privately negotiated transactions. The Company records the total cost of its purchases of Warrants as a reduction in Additional paid-in capital

Repurchases of debt

Repurchases of debt

The Company may repurchase its 6.875% Senior Secured Notes in the open market or through privately negotiated transactions. The Company records its purchases of debt as a reduction in Debt for the par value repurchased as well as a prorated reduction of original issue discount and capitalized issuance costs. Total cost also includes accrued interest on the repurchased debt, which is included in Accrued expenses and other liabilities. The Company will record a gain to the extent that it repurchases debt at a price that is less than par value less the applicable original issue discount and capitalized issuance costs.

Foreign currency translation and foreign currency forward contracts

Foreign currency translation and foreign currency forward contracts

The Company's foreign subsidiaries generally use the U.S. dollar as their functional currency. The Company also has subsidiaries that utilize a functional currency other than the U.S. dollar, comprising its Indian subsidiary, which utilizes the Indian Rupee and, beginning in the third quarter of 2016, Neonet, which utilizes the Swedish Krona. None of these non-U.S. dollar functional currency subsidiaries are significant to the Company’s Consolidated Financial Statements.

Assets and liabilities of these non-U.S. dollar functional currency subsidiaries are translated at exchange rates at the end of a period. Revenues and expenses are translated at average exchange rates during the period. Gains and losses resulting from translating foreign currency financial statements into U.S. dollars are included in Accumulated other comprehensive (loss) income on the Consolidated Statements of Financial Condition and Cumulative translation adjustment, net of tax on the Consolidated Statements of Comprehensive Income.

Gains or losses resulting from foreign currency transactions are included in Investment income and other, net on the Company’s Consolidated Statements of Operations. For the three months ended March 31, 2017 and 2016, the Company recorded gains of $0.2 million and $0.4 million, respectively, on foreign currency transactions.

The Company seeks to reduce the impact of fluctuations in foreign exchange rates on its net investment in certain non-U.S. operations through the use of foreign currency forward contracts. For foreign currency forward contracts designated as hedges, the Company assesses its risk management objectives and strategy, including identification of the hedging instrument, the hedged item and the risk exposure and how effectiveness is to be assessed prospectively and retrospectively. The effectiveness of the hedge is assessed based on the overall changes in the fair value of the forward contracts. For qualifying net investment hedges, any gains or losses, to the extent effective, are included in Accumulated other comprehensive (loss) income on the Consolidated Statements of Financial Condition and Cumulative translation adjustment, net of tax, on the Consolidated Statements of Comprehensive Income. The ineffective portion, if any, is recorded in Investment income and other, net on the Consolidated Statements of Operations.

Stock and unit based compensation

Stock and unit based compensation

Stock and unit based compensation is primarily measured based on the grant date fair value of the awards. These costs are amortized over the requisite service period, if any. Expected forfeitures are considered in determining stock-based employee compensation expense.

Soft dollar expense

Soft dollar expense

Under a commission management program, the Company allows institutional clients to allocate a portion of their gross commissions to pay for research and other services provided by third parties. As the Company acts as an agent in these transactions, it records such expenses on a net basis within Commissions and fees on the Consolidated Statements of Operations.

Depreciation, amortization and occupancy

Depreciation, amortization and occupancy

Fixed assets are depreciated on a straight-line basis over their estimated useful lives of three to seven years. Leasehold improvements are being amortized on a straight-line basis, upon occupancy of the location, over the shorter of the term of the related office lease or the expected useful life of the assets. The Company reviews fixed assets and leasehold improvements for impairment, as well as their remaining useful lives whenever events or changes in circumstances indicate that the related carrying amounts may not be recoverable.

The Company recognizes rent expense under operating leases with fixed rent escalations, lease incentives and free rent periods on a straight-line basis over the lease term beginning on the date the Company takes possession of or controls the use of the space, including during free rent periods.

Lease loss accrual

Lease loss accrual

The Company’s policy is to identify excess real estate capacity and where applicable, accrue for related future costs, net of projected sub-lease income upon the date the Company ceases to use the excess real estate. Such accrual is adjusted to the extent the actual terms of sub-leased property differ from the previous assumptions used in the calculation of the accrual.

Income taxes

Income taxes

The Company is a corporation subject to U.S. corporate income tax as well as non-U.S. income taxes in the jurisdictions in which it operates. The Company records deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the financial reporting and tax bases of assets and liabilities and measures them using the enacted tax rates and laws that will be in effect when such differences are expected to reverse. The Company evaluates the recoverability of future tax deductions by assessing the adequacy of future expected taxable income from all sources, including reversal of temporary differences and forecasted operating earnings.

Variable interest entities

Variable interest entities

A variable interest entity (“VIE”) is an entity that lacks one or more of the following characteristics (i) the total equity investment at risk is sufficient to enable the entity to finance its activities independently and (ii) the equity holders have the power to direct the activities of the entity that most significantly impact its economic performance, the obligation to absorb the losses of the entity and the right to receive the residual returns of the entity.

The Company will be considered to have a controlling financial interest and will consolidate a VIE if it has both (i) the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE.

Since January 2015, the Company has owned 50% of the voting shares and 50% of the equity of a joint venture (“JV”) which maintains microwave communication networks in the U.S. and Europe, and which is considered to be a VIE. The Company and its JV partner each pay monthly fees for the use of the microwave communication networks in connection with their respective trading activities, and the JV may sell excess bandwidth that is not utilized by the JV members to third parties.

In October 2016, the Company invested in another JV with nine other parties. Each party owns 10% of the voting shares and 10% of the equity of this JV, which is building microwave communication networks in the U.S. and Asia, and which is considered to be a VIE. The Company and all of its JV partners each pay monthly fees for the funding of the construction of the microwave communication networks. When completed, this JV may sell excess bandwidth that is not utilized by its joint venture members to third parties.

In each of the JVs, the Company does not have the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance; therefore it does not have a controlling financial interest in the JVs and does not consolidate the JVs. The Company records its interest in the JVs under the equity method of accounting and records its investment in the JVs within Investments and its amounts payable for communication services provided by the JVs within Accrued expenses and other liabilities on the Consolidated Statements of Financial Condition. The Company records its pro-rata share of the JVs earnings or losses within Investment income and other, net and fees related to the use of communication services provided by the JVs within Communications and data processing on the Consolidated Statements of Operations.

The Company’s exposure to the obligations of these VIEs is generally limited to its interests in each respective JV, which is the carrying value of the equity investment in each JV.

Use of estimates

Use of estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results may differ from those estimates.

Recently adopted accounting guidance and Recent accounting guidance to be adopted in future periods

Recently adopted accounting guidance

In March 2016, the FASB issued an ASU which simplifies several aspects of the accounting for employee share-based payment transactions including the accounting for income taxes, forfeitures and classification on the statement of cash flows. The Company adopted this ASU prospectively as of January 1, 2017. Following the adoption of this ASU:

• the Company records all excess tax benefits and tax deficiencies as an income tax benefit or expense in the Consolidated Statements of Operations in the period in which they are realized. Previously such excess tax benefits and deficiencies were recorded within Additional paid-in capital on the Consolidated Statements of Financial Condition, although in certain circumstances tax deficiencies could have been recognized as income tax expense.

• excess tax benefits and tax deficiencies are classified in operating activities, specifically within changes in Accrued expenses and other liabilities, in the Consolidated Statements of Cash Flows. Prior to the adoption of this ASU, the Company reported excess tax benefits and tax deficiencies as a financing activity on its Consolidated Statements of Cash Flows.

• the Company no longer includes any assumed proceeds of any windfall tax benefits when applying the treasury stock method for computing diluted EPS. This may result in higher diluted shares outstanding for EPS calculations.

• the Company elected to continue to estimate its forfeiture rate on grant date. Therefore, a cumulative effect adjustment was not necessary upon adoption of this ASU.

Recent accounting guidance to be adopted in future periods

In May 2014, the FASB issued an ASU that updates the principles for recognizing revenue. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In March 2016, the FASB issued an ASU to clarify guidance on principal versus agent evaluation considerations and whether an entity reports revenue on a gross or net basis. These ASUs will be effective for interim and annual reporting periods beginning after December 15, 2017. Early adoption is permitted for reporting periods beginning after December 15, 2016. The Company has not yet determined its transition approach. Because the guidance does not apply to revenue associated with securities trading activities that are accounted for under other GAAP, the Company does not expect the guidance to have a material impact on its Consolidated Statements of Operations most closely associated with financial instruments, including Trading revenues, net, Commissions and fees, and Interest, net. The Company’s implementation efforts include the identification of revenue within the scope of the guidance and the evaluation of certain revenue contracts. The Company’s evaluation of the impact of the new guidance on its Consolidated Financial Statements is ongoing, and it continues to evaluate the timing of recognition for various revenues, including soft dollar related activity, which may be impacted depending on the features of the client arrangements and the presentation of certain contract costs (whether presented gross or offset against revenues).

In January 2016, the FASB issued an ASU that provides entities guidance for the accounting for equity investments, financial liabilities under the fair value option and the presentation and disclosure requirements of financial instruments. The guidance is effective for reporting periods beginning after December 15, 2018 and early adoption is permitted under a modified retrospective approach for certain financial liabilities as specified in this ASU. The Company does not expect the adoption of this ASU to have an impact on its Consolidated Financial Statements.

In February 2016, the FASB issued an ASU which requires lessees to recognize a right-to-use asset and a lease obligation for all leases. Lessees are permitted to make an accounting policy election to not recognize an asset and liability for leases with a term of twelve months or less. Additional qualitative and quantitative disclosures, including significant judgments made by management, will be required. The guidance is effective for reporting periods beginning after December 15, 2018 and early adoption is permitted under a modified retrospective approach. The Company is evaluating the impact of this ASU on its Consolidated Financial Statements.

In August 2016, the FASB issued an ASU which clarifies the presentation and classification of certain cash receipts and cash payments in the statement of cash flows. This ASU is effective for reporting periods beginning after December 15, 2017 and early adoption is permitted. The Company does not expect the adoption of this ASU to have a significant impact on its Consolidated Financial Statements.

In November 2016, the FASB issued an ASU which requires that cash segregated for regulatory and other purposes, generally described as restricted cash or restricted cash equivalents, be included in cash and cash equivalents disclosed in the statements of cash flows. The guidance is effective for all reporting periods beginning after December 15, 2017. Early adoption is permitted and must be applied retrospectively to all periods presented within the statement of cash flows. The Company does not expect the adoption of this ASU to have an impact on its Consolidated Financial Statements.

In January 2017, the FASB issued an ASU which simplifies the accounting for goodwill impairments. This ASU eliminates the two-step process that required identification of potential impairment and a separate measure of the actual impairment. Goodwill impairment charges, if any, would be determined by reducing the goodwill balance by the difference between the carrying value and the reporting unit’s fair value. The impairment charge would be limited to the carrying value of goodwill. This ASU is effective for annual and interim impairment tests for periods beginning after December 15, 2021. Early adoption is allowed for annual and interim impairment tests occurring after January 1, 2017. The Company does not expect the adoption of this ASU to have a significant impact on its Consolidated Financial Statements.

In January 2017, the FASB issued an ASU to clarify the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The ASU is effective for reporting periods beginning after December 15, 2017. The Company does not expect the adoption of this ASU to have a significant impact on its Consolidated Financial Statements.

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Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2017

Accounting Policies [Abstract]

Schedule of Interest Income and Interest Expense

Interest income and interest expense which have been netted within Interest, net on the Consolidated Statements of Operations are as follows (in thousands):

	For the three months ended March 31,
	2017			2016
Interest Income	$	3,978		$	3,107
Interest Expense	(3,157		)	(2,990		)
Interest, net	$	821		$	117

Net Trading Revenue Including Dividend Income and Expense

Trading revenues, net includes dividend income and expense as follows (in thousands):

	For the three months ended March 31,
	2017			2016
Dividend Income	$	10,360		$	11,921
Dividend Expense	$	(9,329	)	$	(9,148	)

Schedule of Nonconsolidated VIE

The following table presents the Company’s nonconsolidated VIEs at March 31, 2017 (in thousands):

	Carrying Amount				Maximum Exposure to loss
	Asset		Liability				VIEs' assets
Equity investment	$	15,543	$	314	$	15,543	$	41,569

The following table presents the Company’s nonconsolidated VIE at December 31, 2016 (in thousands):

	Carrying Amount				Maximum Exposure to loss
	Asset		Liability				VIE's assets
Equity investment	$	14,822	$	500	$	14,822	$	36,715

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Assets of Business Held for Sale & Sales of Businesses (Tables)

3 Months Ended

Mar. 31, 2017

Discontinued Operations and Disposal Groups [Abstract]

Summary of Assets of Businesses Held for Sale

The assets of businesses held for sale as December 31, 2016 are summarized as follows (in thousands):

	December 31, 2016
Assets:
Intangible assets, net of accumulated amortization	$	8,194
Total assets of businesses held for sale	$	8,194

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Fair Value (Tables)

3 Months Ended

Mar. 31, 2017

Fair Value Disclosures [Abstract]

Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

The following fair value hierarchy table presents information about the Company’s financial assets and liabilities measured at fair value (in thousands):

	Assets and Liabilities Measured at Fair Value on a Recurring Basis
March 31, 2017	Level 1		Level 2		Level 3		Total
Assets
Financial instruments owned, at fair value:
Equities	$	2,179,211	$	—	$	—	$	2,179,211
Corporate debt	91,314		—		—		91,314
U.S. government and Non-U.S. government obligations	37,618		—		—		37,618
Listed options	12,299		—		—		12,299
Total Financial instruments owned, at fair value	2,320,442		—		—		2,320,442
Investments(1)	2,379		2,234		—		4,613
Other (2)	—		54,142		2,838		56,980
Total assets held at fair value	$	2,322,821	$	56,376	$	2,838	$	2,382,035
Liabilities
Financial instruments sold, not yet purchased, at fair value:
Equities	$	1,694,374	$	—	$	—	$	1,694,374
Corporate debt	85,926		—		—		85,926
U.S. government and Non-U.S. government obligations	91,242		—		—		91,242
Listed options	35,835		—		—		35,835
Foreign currency forward contracts	—		598		—		598
Total liabilities held at fair value	$	1,907,377	$	598	$	—	$	1,907,975

⁽¹⁾  Investments comprise $2.4 million of Level 1 investments in CME Group and $2.2 million of Level 2 investments primarily related to deferred compensation investments, all of which are included within Investments on the Consolidated Statements of Financial Condition. See Footnote 8 "Investments" for additional information.

⁽²⁾  Other primarily consists of a $54.1 million receivable from Bats related to the sale of KCG Hotspot and a $2.8 million receivable from the sale of an investment, both of which are included within Other Assets on the Consolidated Statements of Financial Condition.

	Assets and Liabilities Measured at Fair Value on a Recurring Basis
December 31, 2016	Level 1		Level 2		Level 3		Total
Assets
Financial instruments owned, at fair value:
Equities	$	2,343,033	$	—	$	—	$	2,343,033
Corporate debt	127,237		—		—		127,237
U.S. government and Non-U.S. government obligations	50,461		—		—		50,461
Listed options	19,100		—		—		19,100
Foreign currency forward contracts	—		30		—		30
Total Financial instruments owned, at fair value	2,539,831		30		—		2,539,861
Investments (1)	9,198		2,286		—		11,484
Other (2)	—		60,538		2,846		63,384
Total assets held at fair value	$	2,549,029	$	62,854	$	2,846	$	2,614,729
Liabilities
Financial instruments sold, not yet purchased, at fair value:
Equities	$	1,821,957	$	—	$	—	$	1,821,957
Listed options	12,961		—		—		12,961
U.S. government obligations	87,661		—		—		87,661
Corporate debt	123,561		—		—		123,561
Total liabilities held at fair value	$	2,046,140	$	—	$	—	$	2,046,140

⁽¹⁾  Investments comprise $9.2 million of Level 1 investments in CME Group and Bats and also includes $2.3 million of Level 2 investments primarily related to deferred compensation investments, all of which are included within Investments on the Consolidated Statements of Financial Condition. See Footnote 8 "Investments" for additional information.

⁽²⁾  Other primarily consists of a $60.5 million receivable from Bats related to the sale of KCG Hotspot and a $2.8 million receivable from the sale of an investment, both of which are included in Other assets on the Consolidated Statements of Financial Condition.

Changes in Fair Value of Financial Assets Categorized within Level 3

The following is a summary of changes in fair value of the Company's financial assets that have been categorized within Level 3 of the fair value hierarchy at March 31, 2017 and December 31, 2016 (in thousands):

	Level 3 Financial Assets as of March 31, 2017
	Balance at January 1, 2017		Realized gains(losses) during period		Unrealized gains (losses) during the period			Purchases		Sales		Settlements		Issuances		Transfers in or (out) of Level 3		Balance at March 31, 2017
Receivable from sold investment	$	2,846	$	—	$	(8	)	$	—	$	—	$	—	$	—	$	—	$	2,838

	Level 3 Financial Assets as of December 31, 2016
	Balance at January 1, 2016		Realized gains(losses) during period		Unrealized gains (losses) during the period		Purchases		Sales		Settlements			Issuances		Transfers in or (out) of Level 3		Balance at December 31, 2016
Receivable from sold investment	$	5,789	$	—	$	980	$	—	$	—	$	(3,923	)	$	—	$	—	$	2,846

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Derivative Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Summary of Fair Value and Derivative Instruments in Consolidated Statements of Financial Condition

The following tables summarize the fair value and number of derivative instruments held at March 31, 2017 and December 31, 2016. These instruments include those classified as Financial instruments owned, at fair value, Financial instruments sold, not yet purchased, at fair value, as well as futures contracts and bi-lateral over the counter swaps which are reported within Receivable from brokers, dealers and clearing organizations on the Consolidated Statements of Financial Condition. The fair value of assets/liabilities are shown gross of counterparty netting and cash collateral received and pledged. The following tables also provide information regarding 1) the extent to which, under enforceable master netting agreements, such balances are presented net on the Consolidated Statements of Financial Condition as appropriate under GAAP, and 2) the extent to which other rights of setoff associated with these agreements exist and could have an effect on the Company's financial position (in thousands, except contract amounts):

		March 31, 2017
	Financial Statements	Assets				Liabilities
	Location	Fair Value			Contracts	Fair Value			Contracts
Foreign currency
Futures contracts	Receivable from brokers, dealers and clearing organizations	$	163		364	$	240		438
Forward contracts (1)	Financial instruments owned, at fair value	—			—	598			1
Equity
Futures contracts	Receivable from brokers, dealers and clearing organizations	1,594			7,047	2,978			7,326
Swap contracts	Receivable from brokers, dealers and clearing organizations	—			—	195			2
Listed options	Financial instruments owned/sold, not yet purchased, at fair value	12,299			75,294	35,835			76,347
Fixed income
Futures contracts	Receivable from brokers, dealers and clearing organizations	2,545			4,234	5,678			4,038
Commodity
Futures contracts	Receivable from brokers, dealers and clearing organizations	45,889			23,531	45,697			25,762
Gross derivative assets/liabilities, before netting		$	62,490			$	91,221
Less: Legally enforceable master netting agreements
Exchange traded (3)		(49,841		)		(54,593		)
Bi-lateral over-the-counter (4)		—				(195		)
Net amounts per Consolidated Statement of Financial Condition (5)		$	12,649			$	36,433

		December 31, 2016
	Financial Statements	Assets				Liabilities
	Location	Fair Value			Contracts	Fair Value			Contracts
Foreign currency
Futures contracts	Receivable from brokers, dealers and clearing organizations	$	360		1,285	$	1,663		6,495
Forward contracts (1)	Financial instruments owned, at fair value	30			1	—			—
Equity
Futures contracts	Receivable from brokers, dealers and clearing organizations	1,451			2,056	1,644			2,944
Swap contracts	Receivable from brokers, dealers and clearing organizations	16			1	154			1
Listed options	Financial instruments owned/sold, not yet purchased, at fair value	19,100			85,797	12,961			90,063
Forward contracts(2)	Accrued expenses and other liabilities	—			—	1,599			1
Fixed income
Futures contracts	Receivable from brokers, dealers and clearing organizations	4,627			8,590	5,541			5,165
Commodity
Futures contracts	Receivable from brokers, dealers and clearing organizations	86,393			31,800	86,100			31,906
Gross derivative assets/liabilities, before netting		$	111,977			$	109,662
Less: Legally enforceable master netting agreements
Exchange traded (3)		(92,572		)		(94,948		)
Bi-lateral over-the-counter (4)		—				(154		)
Net amounts per Consolidated Statement of Financial Condition (5)		$	19,405			$	14,560

⁽¹⁾  The foreign currency forward contract represents a net investment hedge and is designated as a hedging instrument.

⁽²⁾  The equity forward contract represents a liability to deliver shares of Bats common stock to General Atlantic as described in Footnote 8 "Investments".

⁽³⁾  Exchange traded instruments comprise futures contracts.

⁽⁴⁾  Bi-lateral over-the-counter instruments comprise swaps and forward contracts.

⁽⁵⁾  The Company has not received or pledged additional collateral under master netting agreements and or other credit support agreements that is eligible to be offset beyond what is offset in the Consolidated Statements of Financial Condition.

Summary of Fair Value and Derivative Instruments in Consolidated Statements of Operations

The following table summarizes the gains and losses included in the Consolidated Statements of Operations for the three months ended March 31, 2017 and 2016.

		Gain (Loss) Recognized
	Financial Statements	For the three months ended March 31,
	Location	2017			2016
Derivative instruments not designated as hedging instruments:
Foreign currency
Futures contracts	Trading revenues, net	$	2,712		$	312
Equity
Futures contracts	Trading revenues, net	(7,998		)	8,922
Swap contracts	Trading revenues, net	(795		)	1,886
Listed options	Trading revenues, net	(24		)	3,871
Fixed income
Futures contracts	Trading revenues, net	(118		)	6,833
Commodity
Futures contracts	Trading revenues, net	3,750			6,966
		$	(2,473	)	$	28,790
Derivative instruments designated as hedging instruments:
Foreign exchange - forward contract	Accumulated other comprehensive (loss) income	$	(389	)	$	(149	)

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Collateralized Transactions (Tables)

3 Months Ended

Mar. 31, 2017

Collateralized Agreements [Abstract]

Financial Instruments at Fair Value Received as Collateral that were Permitted to be Delivered or Repledged

The table below presents financial instruments at fair value received as collateral related to Securities borrowed or Receivable from brokers, dealers and clearing organizations on the Consolidated Statements of Financial Condition that were permitted to be delivered or repledged and that were delivered or repledged by the Company as well as the fair value of financial instruments which could be further repledged by the receiving party (in thousands):

	March 31, 2017		December 31, 2016
Collateral permitted to be delivered or repledged	$	1,623,886	$	1,634,979
Collateral that was delivered or repledged	1,577,554		1,550,755
Collateral permitted to be further repledged by the receiving counterparty	151,534		41,730

Summary of Assets Pledged

The table below presents information about assets pledged by the Company (in thousands):

	March 31, 2017		December 31, 2016
Financial instruments owned, at fair value, pledged to counterparties that have the right to deliver or repledge	$	368,736	$	314,720
Financial instruments owned, at fair value, pledged to counterparties that do not have the right to deliver or repledge	1,204,165		1,291,979

Gross Carrying Value of Assets Sold Under Agreements to Repurchase

The table below presents the gross carrying value of Securities loaned, Financial instruments sold under agreements to repurchase and other collateralized financings by class of collateral pledged (in thousands):

March 31, 2017			Financial instruments sold under agreements to repurchase		Other collateralized financings
Asset Class	Securities Loaned
Equities	$	459,533	$	940,000	$	50,000
U.S. government obligations	—		12,584		—
Total	$	459,533	$	952,584	$	50,000

December 31, 2016			Financial instruments sold under agreements to repurchase		Other collateralized financings
Asset Class	Securities Loaned
Equities	$	369,168	$	989,812	$	76,176
U.S. government obligations	—		12,775		—
Corporate debt	3,463		25,188		23,824
Total	$	372,631	$	1,027,775	$	100,000

Assets Subject to Netting

The gross amounts of assets and liabilities subject to netting and gross amounts offset in the Consolidated Statements of Financial Condition were as follows (in thousands):

March 31, 2017	Gross Amounts Recognized		Gross Amounts Offset in the Statements of Financial Condition		Net Amounts Presented in the Statements of Financial Condition		Gross Amounts Not Offset in the Statement of Financial Condition				Net Amount
							Available Collateral(1)		Counterparty Netting(2)
Assets
Securities borrowed	$	1,594,442	$	—	$	1,594,442	$	1,537,957	$	6,225	$	50,260
Receivable from brokers, dealers and clearing organizations (3)	13,735		—		13,735		13,717		2		16
Total assets	$	1,608,177	$	—	$	1,608,177	$	1,551,674	$	6,227	$	50,276
Liabilities
Securities loaned	$	459,533	$	—	$	459,533	$	446,050	$	6,225	$	7,258
Financial instruments sold under agreements to repurchase	952,584		—		952,584		952,582		2		—
Other collateralized financings	50,000		—		50,000		50,000		—		—
Total liabilities	$	1,462,117	$	—	$	1,462,117	$	1,448,632	$	6,227	$	7,258

⁽¹⁾  Includes securities received or delivered under collateral arrangements with counterparties that could be liquidated in the event of a counterparty default and thus offset against a counterparty's rights and obligations under the respective repurchase agreements or securities borrowing or lending arrangements.

⁽²⁾  Under master netting agreements with its counterparties, the Company has the legal right of offset with a counterparty, which incorporates all of the counterparty's outstanding rights and obligations under the arrangement. These balances reflect additional credit risk mitigation that is available by counterparty in the event of a counterparty's default, but which are not netted in the Consolidated Statement of Financial Condition because other netting provisions under U.S. GAAP are not met.

⁽³⁾  Represents financial instruments purchased under agreement to resell.

December 31, 2016	Gross Amounts Recognized		Gross Amounts Offset in the Statements of Financial Condition		Net Amounts Presented in the Statements of Financial Condition		Gross Amounts Not Offset in the Statement of Financial Condition				Net Amount
							Available Collateral(1)		Counterparty Netting(2)
Assets
Securities borrowed	$	1,688,222	$	—	$	1,688,222	$	1,623,281	$	4,581	$	60,360
Receivable from brokers, dealers and clearing organizations (3)	21,832		—		21,832		21,797		—		35
Total assets	$	1,710,054	$	—	$	1,710,054	$	1,645,078	$	4,581	$	60,395
Liabilities
Securities loaned	$	372,631	$	—	$	372,631	$	358,023	$	4,581	$	10,027
Financial instruments sold under agreements to repurchase	1,027,775		—		1,027,775		1,027,775		—		—
Other collateralized financings	100,000		—		100,000		100,000		—		—
Total liabilities	$	1,500,406	$	—	$	1,500,406	$	1,485,798	$	4,581	$	10,027

⁽¹⁾  Includes securities received or delivered under collateral arrangements with counterparties that could be liquidated in the event of a counterparty default and thus offset against a counterparty's rights and obligations under the respective repurchase agreements or securities borrowing or lending arrangements.

⁽²⁾  Under master netting agreements with its counterparties, the Company has the legal right of offset with a counterparty, which incorporates all of the counterparty's outstanding rights and obligations under the arrangement. These balances reflect additional credit risk mitigation that is available by a counterparty in the event of a counterparty's default, but which are not netted in the Consolidated Statement of Financial Condition because other netting provisions under U.S. GAAP are not met.

⁽³⁾  Represents financial instruments purchased under agreement to resell.

Liabilities Subject to Netting

The gross amounts of assets and liabilities subject to netting and gross amounts offset in the Consolidated Statements of Financial Condition were as follows (in thousands):

March 31, 2017	Gross Amounts Recognized		Gross Amounts Offset in the Statements of Financial Condition		Net Amounts Presented in the Statements of Financial Condition		Gross Amounts Not Offset in the Statement of Financial Condition				Net Amount
							Available Collateral(1)		Counterparty Netting(2)
Assets
Securities borrowed	$	1,594,442	$	—	$	1,594,442	$	1,537,957	$	6,225	$	50,260
Receivable from brokers, dealers and clearing organizations (3)	13,735		—		13,735		13,717		2		16
Total assets	$	1,608,177	$	—	$	1,608,177	$	1,551,674	$	6,227	$	50,276
Liabilities
Securities loaned	$	459,533	$	—	$	459,533	$	446,050	$	6,225	$	7,258
Financial instruments sold under agreements to repurchase	952,584		—		952,584		952,582		2		—
Other collateralized financings	50,000		—		50,000		50,000		—		—
Total liabilities	$	1,462,117	$	—	$	1,462,117	$	1,448,632	$	6,227	$	7,258

⁽¹⁾  Includes securities received or delivered under collateral arrangements with counterparties that could be liquidated in the event of a counterparty default and thus offset against a counterparty's rights and obligations under the respective repurchase agreements or securities borrowing or lending arrangements.

⁽²⁾  Under master netting agreements with its counterparties, the Company has the legal right of offset with a counterparty, which incorporates all of the counterparty's outstanding rights and obligations under the arrangement. These balances reflect additional credit risk mitigation that is available by counterparty in the event of a counterparty's default, but which are not netted in the Consolidated Statement of Financial Condition because other netting provisions under U.S. GAAP are not met.

⁽³⁾  Represents financial instruments purchased under agreement to resell.

December 31, 2016	Gross Amounts Recognized		Gross Amounts Offset in the Statements of Financial Condition		Net Amounts Presented in the Statements of Financial Condition		Gross Amounts Not Offset in the Statement of Financial Condition				Net Amount
							Available Collateral(1)		Counterparty Netting(2)
Assets
Securities borrowed	$	1,688,222	$	—	$	1,688,222	$	1,623,281	$	4,581	$	60,360
Receivable from brokers, dealers and clearing organizations (3)	21,832		—		21,832		21,797		—		35
Total assets	$	1,710,054	$	—	$	1,710,054	$	1,645,078	$	4,581	$	60,395
Liabilities
Securities loaned	$	372,631	$	—	$	372,631	$	358,023	$	4,581	$	10,027
Financial instruments sold under agreements to repurchase	1,027,775		—		1,027,775		1,027,775		—		—
Other collateralized financings	100,000		—		100,000		100,000		—		—
Total liabilities	$	1,500,406	$	—	$	1,500,406	$	1,485,798	$	4,581	$	10,027

⁽¹⁾  Includes securities received or delivered under collateral arrangements with counterparties that could be liquidated in the event of a counterparty default and thus offset against a counterparty's rights and obligations under the respective repurchase agreements or securities borrowing or lending arrangements.

⁽²⁾  Under master netting agreements with its counterparties, the Company has the legal right of offset with a counterparty, which incorporates all of the counterparty's outstanding rights and obligations under the arrangement. These balances reflect additional credit risk mitigation that is available by a counterparty in the event of a counterparty's default, but which are not netted in the Consolidated Statement of Financial Condition because other netting provisions under U.S. GAAP are not met.

⁽³⁾  Represents financial instruments purchased under agreement to resell.

Maturities of Assets Sold Under Repurchase Agreements

Maturities of Securities loaned, Financial instruments sold under agreements to repurchase and other collateralized financings are provided in the table below (in thousands):

As of March 31, 2017	Overnight		0 - 30 days		31 - 60 days		61 - 90 days		Total
Securities loaned	$	459,533	$	—	$	—	$	—	$	459,533
Financial instruments sold under agreements to repurchase	12,584		335,000		365,000		240,000		952,584
Other collateralized financings	—		50,000		—		—		50,000
Total	$	472,117	$	385,000	$	365,000	$	240,000	$	1,462,117

As of December 31, 2016	Overnight		0 - 30 days		31 - 60 days		61 - 90 days		Total
Securities loaned	$	372,631	$	—	$	—	$	—	$	372,631
Other	—		100,000		—		—		100,000
Financial instruments sold under agreements to repurchase	12,775		410,000		465,000		140,000		1,027,775
Total	$	385,406	$	510,000	$	465,000	$	140,000	$	1,500,406

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Receivable from and Payable to Brokers, Dealers and Clearing Organizations (Tables)

3 Months Ended

Mar. 31, 2017

Brokers and Dealers [Abstract]

Schedule of Amounts Receivable from and Payable to Brokers, Dealers and Clearing Organizations

Amounts receivable from and payable to brokers, dealers and clearing organizations consist of the following (in thousands):

	March 31, 2017		December 31, 2016
Receivable:
Clearing organizations and other	$	575,544	$	619,425
Financial instruments purchased under agreement to resell	13,735		21,832
Securities failed to deliver	212,399		191,528
Total receivable	$	801,678	$	832,785
Payable:
Clearing organizations and other	$	433,164	$	458,341
Securities failed to receive	62,089		60,559
Total payable	$	495,253	$	518,900

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Investments (Tables)

3 Months Ended

Mar. 31, 2017

Investments [Abstract]

Summary of Investments

Investments primarily comprise strategic investments and deferred compensation investments. Investments consist of the following (in thousands):

	March 31, 2017		December 31, 2016
Strategic investments:
Investments accounted for under the equity method	$	17,313	$	16,707
Investments held at fair value	2,379		9,198
Investments held at cost, less impairment	2,790		2,789
Total strategic investments	22,482		28,694
Other investments	2,234		2,285
Total investments	$	24,716	$	30,979

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Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Intangible Assets, Net by Segment and Type

The following tables summarize the Company’s Intangible assets, net of accumulated amortization by segment and type (in thousands):

	March 31, 2017		December 31, 2016
Market Making
Technology	$	38,759	$	39,536
Trading rights	7,028		7,027
Total	45,787		46,563
Global Execution Services
Technology	20,033		20,694
Customer relationships	7,583		7,944
Trade names	625		650
Total	28,241		29,288
Corporate and Other
Technology (1)	16,418		8,084
Total	$	90,446	$	83,935

⁽¹⁾  Excluded from the December 31, 2016 balance is $8.2 million of intangibles related to a business which met the requirements to be considered held for sale. As noted above and in Footnote 3 "Assets of Business Held for Sale & Sales of Businesses", such amounts were included in Assets of business held for sale at December 31, 2016, however, such intangibles were no longer considered to be held for sale at March 31, 2017 and are therefore included above at March 31, 2017.

		March 31, 2017			December 31, 2016
Technology (1)	Gross carrying amount	$	183,567		$	157,188
	Accumulated amortization	(108,347		)	(88,874		)
	Net carrying amount	75,220			68,314
Trading rights (2)	Gross carrying amount	7,509			7,509
	Accumulated amortization	(491		)	(482		)
	Net carrying amount	7,018			7,027
Customer relationships (3)	Gross carrying amount	13,000			13,000
	Accumulated amortization	(5,417		)	(5,056		)
	Net carrying amount	7,583			7,944
Trade names (4)	Gross carrying amount	1,000			1,000
	Accumulated amortization	(375		)	(350		)
	Net carrying amount	625			650
Total	Gross carrying amount	205,076			178,697
	Accumulated amortization	(114,630		)	(94,762		)
	Net carrying amount	$	90,446		$	83,935

⁽¹⁾  The weighted average remaining life for technology, including capitalized internal use software, was approximately two years as of both March 31, 2017 and December 31, 2016. Excluded from the December 31, 2016 balance is $8.2 million of technology assets related to Assets of businesses held for sale. As noted above and in Footnote 3 "Assets of Business Held for Sale & Sales of Businesses", these assets are included in Assets of businesses held for sale at December 31, 2016.

⁽²⁾  Trading rights provide the Company with the rights to trade on certain exchanges. The weighted average remaining life of trading rights with definite useful lives was approximately 3 and 4 years as of March 31, 2017 and December 31, 2016, respectively. As of March 31, 2017 and December 31, 2016, $6.9 million of trading rights had indefinite useful lives.

⁽³⁾  Customer relationships relate to KCG BondPoint. The weighted average remaining life was approximately 5 and 6 years as of March 31, 2017 and December 31, 2016, respectively. Lives may be reduced depending upon actual retention rates.

⁽⁴⁾  Trade names relate to KCG BondPoint. The weighted average remaining life was approximately 6 and 7 years as of March 31, 2017 and December 31, 2016, respectively.

Summary of Amortization Expense

The following table summarizes the Company’s amortization expense relating to Intangible assets (in thousands):

	For the three months ended March 31,
	2017		2016
Amortization expense	$	10,109	$	7,559

Summary of Estimated Amortization Expense for Future Periods

As of March 31, 2017, the following table summarizes the Company’s estimated amortization expense for future periods (in thousands):

	Amortization     expense
For the nine months ended December 31, 2017	$	33,654
For the year ended December 31, 2018	32,749
For the year ended December 31, 2019	12,708
For the year ended December 31, 2020	2,009
For the year ended December 31, 2021	1,544

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Debt (Tables)

3 Months Ended

Mar. 31, 2017

Debt Disclosure [Abstract]

Summary of Long-term Debt

The carrying value and fair value of the Company's debt is as follows (in thousands):

	March 31, 2017					December 31, 2016
	Carrying Amount			Fair Value		Carrying Amount			Fair Value
6.875% Senior Secured Notes, $465.0 million par	$	462,141		$	480,113	$	461,899		$	466,628
Debt issuance costs	(6,958		)	—		(7,546		)	—
Total	$	455,183		$	480,113	$	454,353		$	466,628

Debt Instrument Redemption

On or after March 15, 2017, KCG may redeem all or a part of the 6.875% Senior Secured Notes upon not less than 30 nor more than 60 days’ notice, at the redemption prices (expressed as percentages of principal amount) set forth below plus accrued and unpaid interest on the 6.875% Senior Secured Notes redeemed, to the applicable redemption date, if redeemed during the 12-month period beginning on March 15 of the years indicated below:

Year	Percentage
2017	103.438	%
2018	101.719	%
2019 and thereafter	100.000	%

Recorded Expenses with Respect to Long-term Debt

The Company recorded expenses with respect to its Debt as follows (in thousands):

	For the three months ended March 31,
	2017		2016
Interest expense	$	8,234	$	8,417
Amortization of debt issuance costs (1)	795		821
Commitment fee (2)	354		359
Accelerated amortization of debt issuance costs (3)	—		738
Accelerated interest expense on repurchase of debt (3)	—		298
Total	$	9,383	$	10,633

⁽¹⁾  Included within Interest expense on the Consolidated Statements of Operations.

⁽²⁾  Included within Other expense on the Consolidated Statements of Operations.

⁽³⁾  In conjunction with the repurchase of debt in the open market, the Company accelerated a prorated portion of its original issue discount and capitalized debt issuance costs. These costs have been netted against the gain on repurchase within Investment income and other, net on the Consolidated Statements of Operations for the three months ended March 31, 2016.

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Related Parties (Tables)

3 Months Ended

Mar. 31, 2017

Related Party Transactions [Abstract]

Summary of Balances and Transactions with Related Parties or Their Affiliates

As of the date and period indicated below, the Company had the following balances and transactions with its related parties or their affiliates (in thousands):

	For the three months ended March 31,
Statements of Operations	2017		2016
Revenues
Commissions and fees	$	1,868	$	6,663
Trading revenues, net	791		477
Interest, net	119		103
Total revenues from related parties	$	2,778	$	7,243
Expenses
Execution and clearance fees(1)	$	313	$	880
Communications and data processing	5,610		3,206
Payment for order flow	—		5
Collateralized financing interest	86		78
Other expense	—		5
Total expenses incurred with respect to related parties	$	6,009	$	4,174

⁽¹⁾  Represents net volume based fees paid or received by KCG for taking or providing liquidity to related trading venues. Volume based fees will vary period to period based on usage.

Statements of Financial Condition	March 31, 2017		December 31, 2016
Assets
Securities borrowed	$	17,754	$	5,293
Receivable from brokers, dealers and clearing organizations	2,134		2,106
Other assets	16		62,906
Liabilities
Securities loaned	$	2,063	$	2,594
Payable to brokers, dealers and clearing organizations	45		188
Accrued expenses and other liabilities	122		3,708

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Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Compensation Expense Relating to RSUs and Summary of Changes in Incentive Units

Compensation expense relating to RSUs, which is primarily recorded in Employee compensation and benefits, and the corresponding income tax benefit, which is recorded in Income tax (benefit) expense on the Consolidated Statements of Operations are presented in the following table (in thousands):

	For the three months ended March 31,
	2017		2016
Stock award compensation expense	$	2,438	$	17,053
Income tax benefit	926		6,480

The following is a summary of the changes in the incentive units for the three months ended March 31, 2017 (units in thousands):

	Vested
Incentive units at December 31, 2016	16
Issued	—
Vested	(1	)
Exercised	—
Canceled	—
Incentive units at March 31, 2017	15

Summary of Restricted Awards Activity

The following table summarizes restricted awards activity for the three months ended March 31, 2017 (awards in thousands):

	Restricted Stock Units
	Number of Units		Weighted- Average Grant date Fair Value
Outstanding at December 31, 2016	5,563		$	11.25
Granted	800		14.27
Vested	(2,634	)	11.19
Forfeited	(72	)	12.10
Outstanding at March 31, 2017	3,657		$	11.93

Compensation Expense Relating to Stock Options and SARs

Compensation expense relating to stock options and SARs, all of which was recorded in Employee compensation and benefits, as well as the corresponding income tax (benefit) expense, which is recorded in Income tax expense on the Consolidated Statements of Operations are as follows (in thousands):

	For the three months ended March 31,
	2017		2016
Stock option and SAR compensation expense	$	122	$	134
Income tax benefit	46		51

Summary of Stock Option, SAR Activity and Stock Options Exercisable

The following table summarizes stock option and SAR activity and stock options exercisable for the three months ended March 31, 2017 (awards in thousands):

	Number of Stock Awards		Weighted- Average Exercise Price		Aggregate Intrinsic Value		Weighted- Average Remaining Life (years)
Outstanding at December 31, 2016 (1)	6,298		$	18.88
Granted	—		—
Exercised	(337	)	8.24
Forfeited or expired	(94	)	53.56
Outstanding at March 31, 2017 (1)	5,867		$	19.03	$	14,269	2.23
Exercisable at March 31, 2017	4,492		$	17.75	$	14,269	1.69
Available for future grants at March 31, 2017 (2)	13,630

⁽¹⁾ Includes 1.7 million SARs.

⁽²⁾ Represents shares available for grant of options, SARs, RSUs and other awards under the Amended 2015 Plan.

Schedule of Compensation Expense (Benefit)

Compensation expense (benefit) related to the Incentive units which are recorded within Employee compensation and benefits on the Consolidated Statements of Operations are as follows (in thousands):

	For the three months ended March 31,
	2017		2016
Incentive units	$	437	$	(77	)

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Accumulated Other Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 2017

Equity [Abstract]

Accumulated Other Comprehensive Income (Loss), Net of Tax

The following table presents changes in Accumulated other comprehensive (loss) income, net of tax by component for the three months ended March 31, 2017 and 2016 (in thousands):

	Unrealized Gains (Losses) on Available-for-Sale Securities			Foreign Currency Translation Adjustments			Total
Balance, December 31, 2016	$	3,286		$	(1,039	)	$	2,247
Other comprehensive income	170			437			607
Amount reclassified from Available-for-sale securities, net of tax	(2,956		)	—			(2,956		)
Balance March 31, 2017	$	500		$	(602	)	$	(102	)

	Unrealized Gains on Available-for-Sale Securities		Foreign Currency Translation Adjustments			Total
Balance, December 31, 2015	$	150	$	200		$	350
Other comprehensive income (loss)	68		(133		)	(65		)
Balance March 31, 2016	$	218	$	67		$	285

Reclassification out of Accumulated Other Comprehensive Income

The following table presents the effects of reclassifications out of Accumulated Other Comprehensive (Loss) Income and into the Consolidated Statements of Operations for the three months ended March 31, 2017 (in thousands):

Details about Accumulated Other Comprehensive Income Components	Amounts Reclassified from Other Comprehensive Income			Affected Line Item in the Consolidated Statement of Operations where Net Income is Presented
Available-for-sale securities:
Reclassification of unrealized net gains	4,767			Investment income and other, net
Related income tax expense	(1,811		)	Income tax (benefit) expense
	$	2,956		Net of tax

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Warrants and Stock Repurchases (Tables)

3 Months Ended

Mar. 31, 2017

Equity [Abstract]

Adjusted Exercise Price and Activity of Warrants

The adjusted exercise price for each class of Warrants and the activity for the three months ended March 31, 2017 were as follows (Warrants in thousands):

	Class A			Class B			Class C
Original Exercise Price	$	12.00		$	13.50		$	15.00
Adjusted Exercise Price	$	11.70		$	13.16		$	14.63
Initial term (years)	4			5			6
Expiration	7/1/2017			7/1/2018			7/1/2019
										Total
Warrants - Outstanding at December 31, 2016	2,026			2,069			2,087			6,182
Exercised	(545		)	(44		)	(44		)	(633	)
Repurchased	(359		)	(359		)	(359		)	(1,077	)
Warrants - Outstanding at March 31, 2017	1,122			1,666			1,684			4,472

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Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2017

Earnings Per Share [Abstract]

Schedule of Reconciliation of Earnings Per Share

The following is a reconciliation of the numerators and denominators of the basic and diluted earnings per share computations for the three months ended March 31, 2017 and 2016 (in thousands, except per share amounts):

	For the three months ended March 31,
	2017				2016
	Numerator  / net income		Denominator /     shares		Numerator  / net income		Denominator /  shares
Income and shares used in basic calculations	$	3,212	66,306		$	37,165	88,458
Effect of dilutive stock based awards
Restricted awards and warrants			800				992
Stock options and SARs			536				155
Income and shares used in diluted calculations	$	3,212	67,642		$	37,165	89,605
Basic earnings per common share			$	0.05			$	0.42
Diluted earnings per common share			$	0.05			$	0.41

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Commitments and Contingent Liabilities (Tables)

3 Months Ended

Mar. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Payments Under Capital Leases

The future minimum payments including interest under the capitalized leases at March 31, 2017 consist of (in thousands):

	Minimum Payments
Nine months ending December 31, 2017	$	5,625
Year ending December 31, 2018	7,272
Year ending December 31, 2019	7,272
Year ending December 31, 2020	1,103
Total	$	21,272

Schedule of Interest Expense, Capital Leases

The total interest expense related to capital leases for the three months ended March 31, 2017 and 2016 included in Debt interest expense on the Consolidated Statements Operations is as follows (in thousands):

	For the three months ended March 31,
	2017		2016
Interest expense - Capital leases	$	24	$	24

Schedule of Future Minimum Rental Commitments for Operating Leases

As of March 31, 2017, future minimum rental commitments under all noncancelable office, computer and equipment leases (“Gross Lease Obligations”), and sublease income were as follows (in thousands):

	Gross Lease Obligations		Sublease Income		Net Lease Obligations
Nine months ending December 31, 2017	$	22,057	$	4,573	$	17,484
Year ending December 31, 2018	27,978		5,850		22,128
Year ending December 31, 2019	25,031		5,229		19,802
Year ending December 31, 2020	23,310		4,056		19,254
Year ending December 31, 2021	22,771		4,039		18,732
Thereafter through December 31, 2031	154,234		10,096		144,138
Total	$	275,381	$	33,843	$	241,538

Activity in Liability Account Related to Office Space Consolidation

The activity in the liability accounts related to the Company’s lease losses and lease terminations for its U.S. leases are recorded in Accrued expenses and other liabilities on the Consolidated Statements of Financial Condition as follows (in thousands):

	For the three months ended March 31, 2017			For the year ended December 31, 2016
Balance as of beginning of period	$	14,251		$	18,892
Real estate charges incurred	—			390
Payments made, net	(1,566		)	(3,750		)
Other charges	884			(1,281		)
Balance as of end of period	$	13,569		$	14,251

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Business Segments (Tables)

3 Months Ended

Mar. 31, 2017

Segment Reporting [Abstract]

Revenues, Pre-tax Earnings and Total Assets by Segment

The Company’s revenues, income (loss) before income taxes (“Pre-tax earnings”) and total assets by segment are summarized in the following table (in thousands):

	Market Making		Global Execution Services		Corporate and Other (1)			Consolidated Total
For the three months ended March 31, 2017:
Revenues	$	174,656	$	70,756	$	9,961		$	255,373
Pre-tax earnings	18,023		1,994		(20,421		)	(404		)
Total assets	5,255,849		1,001,933		(274,353		)	5,983,429
For the three months ended March 31, 2016:
Revenues	$	258,918	$	76,394	$	10,112		$	345,424
Pre-tax earnings	75,489		6,261		(21,785		)	59,965
Total assets	4,999,201		1,020,306		176,791			6,196,298

⁽¹⁾  Amounts shown in the Corporate and Other segment include eliminations of income statement and balance sheet items included in the Company's other segments.

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Organization and Description of the Business (Details) - Agreement and Plan of Merger with Virtu Financial, Inc. - Subsequent Event	Apr. 20, 2017 $ / shares
Class of Stock [Line Items]
Cash exercise price of right (in usd per share)	$ 20.00
Common Class A
Class of Stock [Line Items]
Par value per share (in usd per share)	$ 0.01

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Significant Accounting Policies - Additional Information (Details) $ in Millions	1 Months Ended	3 Months Ended
	Oct. 31, 2016 investee	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2016	Mar. 10, 2015
JV
Variable Interest Entity, Not Primary Beneficiary, Disclosures [Abstract]
Ownership percentage	10.00%	50.00%
VIE
Variable Interest Entity, Not Primary Beneficiary, Disclosures [Abstract]
Ownership percentage	10.00%	50.00%
Number of other parties | investee	9
Minimum
Goodwill and intangible assets
Amortization period		1 year
Foreign currency translation and foreign currency forward contracts
Fixed assets, useful life		3 years
Maximum
Goodwill and intangible assets
Amortization period		6 years
Foreign currency translation and foreign currency forward contracts
Fixed assets, useful life		7 years
Investment Income and Other, Net
Foreign currency translation and foreign currency forward contracts
Gain (loss) on foreign currency transactions | $		$ 0.2	$ 0.4
Senior Secured Notes | 6.875% Senior Secured Notes
Repurchases of debt
Interest rate (percent)		6.875%	6.875%	6.875%	6.875%
Software
Goodwill and intangible assets
Amortization period		3 years

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Significant Accounting Policies - Schedule of Interest Income and Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accounting Policies [Abstract]
Interest Income	$ 3,978	$ 3,107
Interest Expense	(3,157)	(2,990)
Interest, net	$ 821	$ 117

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Significant Accounting Policies - Net Trading Revenue Including Dividend Income and Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accounting Policies [Abstract]
Dividend Income	$ 10,360	$ 11,921
Dividend Expense	$ (9,329)	$ (9,148)

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Significant Accounting Policies - Nonconsolidated VIEs (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Variable Interest Entity [Line Items]
Carrying Amount, Asset	$ 15,543	$ 14,822
Carrying Amount, Liability	314	500
Maximum Exposure to loss	15,543	14,822
VIEs' assets	5,983,429	6,261,287	$ 6,196,298
VIE
Variable Interest Entity [Line Items]
VIEs' assets	$ 41,569	$ 36,715

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Assets of Business Held for Sale & Sales of Businesses - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended			3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Intangible assets, net of accumulated amortization							$ 8,200
Gain from sale of assets to third party				$ 4,834	$ 2,798
Disposal Group, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Intangible assets, net of accumulated amortization							$ 8,194
KCG Hotspot
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale period			3 years
Annual payments for share in tax benefits	$ 6,500	$ 6,600
KCG Hotspot | Investment Income and Other, Net | Retail Options Market Making Business | Disposal Group, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain from sale of assets to third party					$ 2,900
KCG Hotspot | Other Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Receivables from sale of investment	$ 54,100			54,100
KCG Hotspot | Scenario, Forecast
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds related to tax sharing arrangement						$ 50,000
KCG Hotspot | Maximum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds related to tax sharing arrangement			$ 70,000
Annual payments for share in tax benefits			$ 6,600
Remaining additional payment for share in tax benefits				$ 56,800

XML

Assets of Business Held for Sale & Sales of Businesses - Assets of Businesses Held for Sale (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Assets:
Intangible assets, net of accumulated amortization	$ 8,200
Total assets of businesses held for sale	8,200
Disposal Group, Held-for-sale
Assets:
Intangible assets, net of accumulated amortization	8,194
Total assets of businesses held for sale	$ 8,194

XML

Fair Value - Additional Information (Details) ₨ in Millions	Mar. 31, 2017 INR (₨)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Fair Value Disclosures [Abstract]
Transfers of financial instruments between levels		$ 0	$ 0
Transfers of financial instruments between level 2 to level 1		0	$ 0
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notional value of foreign currency forward	₨ 735.0	11,300,000
Level 3 | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Receivables exposure, undiscounted		0
Level 3 | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Receivables exposure, undiscounted		$ 4,600,000

XML

Fair Value - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Assets
Total Financial instruments owned, at fair value	$ 2,320,442	$ 2,539,861
Total assets held at fair value	2,382,035	2,614,729
Liabilities
Financial instruments sold, not yet purchased, at fair value	1,907,975	2,046,140
Total liabilities held at fair value	1,907,975	2,046,140
Level 1
Assets
Total Financial instruments owned, at fair value	2,320,442	2,539,831
Total assets held at fair value	2,322,821	2,549,029
Liabilities
Total liabilities held at fair value	1,907,377	2,046,140
Level 2
Assets
Total Financial instruments owned, at fair value	0	30
Total assets held at fair value	56,376	62,854
Liabilities
Total liabilities held at fair value	598	0
Investments	2,200	2,300
Level 3
Assets
Total Financial instruments owned, at fair value	0	0
Total assets held at fair value	2,838	2,846
Liabilities
Total liabilities held at fair value	0	0
Equities
Assets
Total Financial instruments owned, at fair value	2,179,211	2,343,033
Liabilities
Financial instruments sold, not yet purchased, at fair value	1,694,374	1,821,957
Equities | Level 1
Assets
Total Financial instruments owned, at fair value	2,179,211	2,343,033
Liabilities
Financial instruments sold, not yet purchased, at fair value	1,694,374	1,821,957
Equities | Level 2
Assets
Total Financial instruments owned, at fair value	0	0
Liabilities
Financial instruments sold, not yet purchased, at fair value	0	0
Equities | Level 3
Assets
Total Financial instruments owned, at fair value	0	0
Liabilities
Financial instruments sold, not yet purchased, at fair value	0	0
Corporate debt
Assets
Total Financial instruments owned, at fair value	91,314	127,237
Liabilities
Financial instruments sold, not yet purchased, at fair value	85,926	123,561
Corporate debt | Level 1
Assets
Total Financial instruments owned, at fair value	91,314	127,237
Liabilities
Financial instruments sold, not yet purchased, at fair value	85,926	123,561
Corporate debt | Level 2
Assets
Total Financial instruments owned, at fair value	0	0
Liabilities
Financial instruments sold, not yet purchased, at fair value	0	0
Corporate debt | Level 3
Assets
Total Financial instruments owned, at fair value	0
Liabilities
Financial instruments sold, not yet purchased, at fair value	0	0
U.S. government and Non-U.S. government obligations
Assets
Total Financial instruments owned, at fair value	37,618	50,461
Liabilities
Financial instruments sold, not yet purchased, at fair value	91,242	87,661
U.S. government and Non-U.S. government obligations | Level 1
Assets
Total Financial instruments owned, at fair value	37,618	50,461
Liabilities
Financial instruments sold, not yet purchased, at fair value	91,242	87,661
U.S. government and Non-U.S. government obligations | Level 2
Assets
Total Financial instruments owned, at fair value	0	0
Liabilities
Financial instruments sold, not yet purchased, at fair value	0	0
U.S. government and Non-U.S. government obligations | Level 3
Assets
Total Financial instruments owned, at fair value	0
Liabilities
Financial instruments sold, not yet purchased, at fair value	0	0
Listed options
Assets
Total Financial instruments owned, at fair value	12,299	19,100
Liabilities
Financial instruments sold, not yet purchased, at fair value	35,835	12,961
Listed options | Level 1
Assets
Total Financial instruments owned, at fair value	12,299	19,100
Liabilities
Financial instruments sold, not yet purchased, at fair value	35,835	12,961
Listed options | Level 2
Assets
Total Financial instruments owned, at fair value	0	0
Liabilities
Financial instruments sold, not yet purchased, at fair value	0	0
Listed options | Level 3
Assets
Total Financial instruments owned, at fair value	0	0
Liabilities
Financial instruments sold, not yet purchased, at fair value	0	0
Foreign currency forward contracts
Assets
Total Financial instruments owned, at fair value		30
Liabilities
Financial instruments sold, not yet purchased, at fair value	598
Foreign currency forward contracts | Level 1
Assets
Total Financial instruments owned, at fair value		0
Liabilities
Financial instruments sold, not yet purchased, at fair value	0
Foreign currency forward contracts | Level 2
Assets
Total Financial instruments owned, at fair value		30
Liabilities
Financial instruments sold, not yet purchased, at fair value	598
Foreign currency forward contracts | Level 3
Assets
Total Financial instruments owned, at fair value		0
Liabilities
Financial instruments sold, not yet purchased, at fair value	0
Investments
Assets
Total assets held at fair value	4,613	11,484
Investments | Level 1
Assets
Total assets held at fair value	2,379	9,198
Liabilities
Investments	2,400
Investments | Level 2
Assets
Total assets held at fair value	2,234	2,286
Investments | Level 3
Assets
Total assets held at fair value	0	0
CME Group and BATS | Level 1
Liabilities
Investments		9,200
Other
Assets
Total assets held at fair value	56,980	63,384
Other | Other Assets and Investments
Assets
Total assets held at fair value	2,800	2,800
Other | KCG Hotspot | Other Assets and Investments
Liabilities
Receivable from BATS	54,100	60,500
Other | Level 1
Assets
Total assets held at fair value	0	0
Other | Level 2
Assets
Total assets held at fair value	54,142	60,538
Other | Level 3
Assets
Total assets held at fair value	$ 2,838	$ 2,846

XML

Fair Value - Level 3 Financial Assets (Details) - Receivable from sold investment - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 2,846	$ 5,789
Realized gains(losses) during period	0	0
Unrealized gains (losses) during the period	(8)	980
Purchases	0	0
Sales	0	0
Settlements	0	(3,923)
Issuances	0	0
Transfers in or (out) of Level 3	0	0
Balance at end of period	$ 2,838	$ 2,846

XML

Derivative Financial Instruments - Fair Value of Derivative Instruments (Details) $ in Thousands	Mar. 31, 2017 USD ($) contract	Dec. 31, 2016 USD ($) contract
Assets
Fair Value	$ 62,490	$ 111,977
Net amounts per Consolidated Statement of Financial Condition	12,649	19,405
Liabilities
Fair Value	91,221	109,662
Net amounts per Consolidated Statement of Financial Condition	36,433	14,560
Foreign currency, Futures contracts | Receivable from brokers, dealers and clearing organizations
Assets
Fair Value	$ 163	$ 360
Contracts | contract	364	1,285
Liabilities
Fair Value	$ 240	$ 1,663
Contracts | contract	438	6,495
Foreign currency, Forward contracts | Financial instruments owned, at fair value
Assets
Fair Value	$ 0	$ 30
Contracts | contract	0	1
Liabilities
Fair Value	$ 598	$ 0
Contracts | contract	1	0
Equity, Futures contracts | Receivable from brokers, dealers and clearing organizations
Assets
Fair Value	$ 1,594	$ 1,451
Contracts | contract	7,047	2,056
Liabilities
Fair Value	$ 2,978	$ 1,644
Contracts | contract	7,326	2,944
Equity, Swap contracts | Receivable from brokers, dealers and clearing organizations
Assets
Fair Value	$ 0	$ 16
Contracts | contract	0	1
Liabilities
Fair Value	$ 195	$ 154
Contracts | contract	2	1
Equity, Listed options | Financial instruments owned/sold, not yet purchased, at fair value
Assets
Fair Value	$ 12,299	$ 19,100
Contracts | contract	75,294	85,797
Liabilities
Fair Value	$ 35,835	$ 12,961
Contracts | contract	76,347	90,063
Equity, Forward contracts | Accrued expenses and other liabilities
Assets
Fair Value		$ 0
Contracts | contract		0
Liabilities
Fair Value		$ 1,599
Contracts | contract		1
Fixed income, Futures contracts | Receivable from brokers, dealers and clearing organizations
Assets
Fair Value	$ 2,545	$ 4,627
Contracts | contract	4,234	8,590
Liabilities
Fair Value	$ 5,678	$ 5,541
Contracts | contract	4,038	5,165
Commodity, Futures contracts | Receivable from brokers, dealers and clearing organizations
Assets
Fair Value	$ 45,889	$ 86,393
Contracts | contract	23,531	31,800
Liabilities
Fair Value	$ 45,697	$ 86,100
Contracts | contract	25,762	31,906
Futures contracts and listed options | Exchange traded
Assets
Less: Legally enforceable master netting agreements	$ (49,841)	$ (92,572)
Liabilities
Less: Legally enforceable master netting agreements	(54,593)	(94,948)
Swaps | Bi-lateral over-the-counter
Assets
Less: Legally enforceable master netting agreements	0	0
Liabilities
Less: Legally enforceable master netting agreements	$ (195)	$ (154)

XML

Derivative Financial Instruments - Gain (Loss) Recognized (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Derivative instruments not designated as hedging instruments | Trading revenues, net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized	$ (2,473)	$ 28,790
Derivative instruments not designated as hedging instruments | Foreign currency, Futures contracts | Trading revenues, net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized	2,712	312
Derivative instruments not designated as hedging instruments | Equity, Futures contracts | Trading revenues, net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized	(7,998)	8,922
Derivative instruments not designated as hedging instruments | Equity, Swap contracts | Trading revenues, net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized	(795)	1,886
Derivative instruments not designated as hedging instruments | Equity, Listed options | Trading revenues, net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized	(24)	3,871
Derivative instruments not designated as hedging instruments | Fixed income, Futures contracts | Trading revenues, net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized	(118)	6,833
Derivative instruments not designated as hedging instruments | Commodity, Futures contracts | Trading revenues, net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized	3,750	6,966
Derivative instruments designated as hedging instruments | Foreign currency, Forward contracts | Accumulated other comprehensive (loss) income
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized	$ (389)	$ (149)

XML

Collateralized Transactions - Financial Instruments at Fair Value Received as Collateral that were Permitted to be Delivered or Repledged (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Collateralized Agreements [Abstract]
Collateral permitted to be delivered or repledged	$ 1,623,886	$ 1,634,979
Collateral that was delivered or repledged	1,577,554	1,550,755
Collateral permitted to be further repledged by the receiving counterparty	$ 151,534	$ 41,730

XML

Collateralized Transactions - Additional Information (Details)	3 Months Ended
	Mar. 31, 2017
Collateralized Agreements [Abstract]
Repurchase agreements and other secured financings, maturity (years)	1 year

XML

Collateralized Transactions - Assets Pledged (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Repurchase Agreement Counterparty [Line Items]
Financial instruments owned, at fair value, pledged to counterparties that have the right to deliver or repledge	$ 1,623,886	$ 1,634,979
Right to deliver or repledge
Repurchase Agreement Counterparty [Line Items]
Financial instruments owned, at fair value, pledged to counterparties that have the right to deliver or repledge	368,736	314,720
Not having the right to deliver or repledge
Repurchase Agreement Counterparty [Line Items]
Financial instruments owned, at fair value, pledged to counterparties that do not have the right to deliver or repledge	$ 1,204,165	$ 1,291,979

XML

Collateralized Transactions - Agreements to Repurchase (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Loaned	$ 459,533	$ 372,631
Financial instruments sold under agreements to repurchase	952,584	1,027,775
Equities
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Loaned	459,533	369,168
Financial instruments sold under agreements to repurchase	940,000	989,812
U.S. government obligations
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Loaned	0	0
Financial instruments sold under agreements to repurchase	12,584	12,775
Corporate debt
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Loaned		3,463
Financial instruments sold under agreements to repurchase		25,188
Other collateralized financings
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Loaned	50,000	100,000
Other collateralized financings | Equities
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Loaned	50,000	76,176
Other collateralized financings | U.S. government obligations
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Loaned	$ 0	0
Other collateralized financings | Corporate debt
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Loaned		$ 23,824

XML

Collateralized Transactions - Gross Amounts Offset (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Assets, Securities Borrowed
Gross Amounts Recognized	$ 1,594,442	$ 1,688,222
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts Presented in the Statements of Financial Condition	1,594,442	1,688,222
Gross Amounts Not Offset in the Statement of Financial Condition, Available Collateral	1,537,957	1,623,281
Gross Amounts Not Offset in the Statement of Financial Condition, Counterparty Netting	6,225	4,581
Net Amount	50,260	60,360
Assets, Receivable from Brokers, Dealers and Clearing Organizations
Gross Amounts Recognized	13,735	21,832
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts Presented in the Statements of Financial Condition	13,735	21,832
Gross Amounts Not Offset in the Statement of Financial Condition, Available Collateral	13,717	21,797
Gross Amounts Not Offset in the Statement of Financial Condition, Counterparty Netting	2	0
Net Amount	16	35
Total assets
Gross Amounts Recognized	1,608,177	1,710,054
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts Presented in the Statements of Financial Condition	1,608,177	1,710,054
Gross Amounts Not Offset in the Statement of Financial Condition, Available Collateral	1,551,674	1,645,078
Gross Amounts Not Offset in the Statement of Financial Condition, Counterparty Netting	6,227	4,581
Net Amount	50,276	60,395
Liabilities, Securities Loaned
Gross Amounts Recognized	459,533	372,631
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts Presented in the Statements of Financial Condition	459,533	372,631
Gross Amounts Not Offset in the Statement of Financial Condition, Available Collateral	446,050	358,023
Gross Amounts Not Offset in the Statement of Financial Condition, Counterparty Netting	6,225	4,581
Net Amount	7,258	10,027
Liabilities, Financial Instruments Sold Under Agreements to Repurchase
Gross Amounts Recognized	952,584	1,027,775
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts Presented in the Statements of Financial Condition	952,584	1,027,775
Gross Amounts Not Offset in the Statement of Financial Condition, Available Collateral	952,582	1,027,775
Gross Amounts Not Offset in the Statement of Financial Condition, Counterparty Netting	2	0
Net Amount	0	0
Total liabilities
Gross Amounts Recognized	1,462,117	1,500,406
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts Presented in the Statements of Financial Condition	1,462,117	1,500,406
Gross Amounts Not Offset in the Statement of Financial Condition, Available Collateral	1,448,632	1,485,798
Gross Amounts Not Offset in the Statement of Financial Condition, Counterparty Netting	6,227	4,581
Net Amount	7,258	10,027
Other collateralized financings
Liabilities, Securities Loaned
Gross Amounts Recognized	50,000	100,000
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts Presented in the Statements of Financial Condition	50,000	100,000
Gross Amounts Not Offset in the Statement of Financial Condition, Available Collateral	50,000	100,000
Gross Amounts Not Offset in the Statement of Financial Condition, Counterparty Netting	0	0
Net Amount	$ 0	$ 0

XML

Collateralized Transactions - Maturities Schedule (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Assets Sold under Agreements to Repurchase [Line Items]
Assets sold under agreements to repurchase	$ 1,462,117	$ 1,500,406
Overnight
Assets Sold under Agreements to Repurchase [Line Items]
Assets sold under agreements to repurchase	472,117	385,406
0 - 30 days
Assets Sold under Agreements to Repurchase [Line Items]
Assets sold under agreements to repurchase	385,000	510,000
31 - 60 days
Assets Sold under Agreements to Repurchase [Line Items]
Assets sold under agreements to repurchase	365,000	465,000
61 - 90 days
Assets Sold under Agreements to Repurchase [Line Items]
Assets sold under agreements to repurchase	240,000	140,000
Securities loaned
Assets Sold under Agreements to Repurchase [Line Items]
Assets sold under agreements to repurchase	459,533	372,631
Securities loaned | Overnight
Assets Sold under Agreements to Repurchase [Line Items]
Assets sold under agreements to repurchase	459,533	372,631
Securities loaned | 0 - 30 days
Assets Sold under Agreements to Repurchase [Line Items]
Assets sold under agreements to repurchase	0	0
Securities loaned | 31 - 60 days
Assets Sold under Agreements to Repurchase [Line Items]
Assets sold under agreements to repurchase	0	0
Securities loaned | 61 - 90 days
Assets Sold under Agreements to Repurchase [Line Items]
Assets sold under agreements to repurchase	0	0
Financial instruments sold under agreements to repurchase
Assets Sold under Agreements to Repurchase [Line Items]
Assets sold under agreements to repurchase	952,584	1,027,775
Financial instruments sold under agreements to repurchase | Overnight
Assets Sold under Agreements to Repurchase [Line Items]
Assets sold under agreements to repurchase	12,584	12,775
Financial instruments sold under agreements to repurchase | 0 - 30 days
Assets Sold under Agreements to Repurchase [Line Items]
Assets sold under agreements to repurchase	335,000	410,000
Financial instruments sold under agreements to repurchase | 31 - 60 days
Assets Sold under Agreements to Repurchase [Line Items]
Assets sold under agreements to repurchase	365,000	465,000
Financial instruments sold under agreements to repurchase | 61 - 90 days
Assets Sold under Agreements to Repurchase [Line Items]
Assets sold under agreements to repurchase	240,000	140,000
Other collateralized financings
Assets Sold under Agreements to Repurchase [Line Items]
Assets sold under agreements to repurchase	50,000	100,000
Other collateralized financings | Overnight
Assets Sold under Agreements to Repurchase [Line Items]
Assets sold under agreements to repurchase	0	0
Other collateralized financings | 0 - 30 days
Assets Sold under Agreements to Repurchase [Line Items]
Assets sold under agreements to repurchase	50,000	100,000
Other collateralized financings | 31 - 60 days
Assets Sold under Agreements to Repurchase [Line Items]
Assets sold under agreements to repurchase	0	0
Other collateralized financings | 61 - 90 days
Assets Sold under Agreements to Repurchase [Line Items]
Assets sold under agreements to repurchase	$ 0	$ 0

XML

Receivable from and Payable to Brokers, Dealers and Clearing Organizations (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Receivable:
Clearing organizations and other	$ 575,544	$ 619,425
Financial instruments purchased under agreement to resell	13,735	21,832
Securities failed to deliver	212,399	191,528
Total receivable	801,678	832,785
Payable:
Clearing organizations and other	433,164	458,341
Securities failed to receive	62,089	60,559
Total payable	$ 495,253	$ 518,900

XML

Investments - Components of Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Strategic investments:
Investments accounted for under the equity method	$ 17,313	$ 16,707
Investments held at fair value	2,379	9,198
Investments held at cost, less impairment	2,790	2,789
Total strategic investments	22,482	28,694
Other investments	2,234	2,285
Total investments	$ 24,716	$ 30,979

XML

Investments - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended
	Dec. 31, 2016	Nov. 30, 2016	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Mar. 10, 2015
Schedule of Equity Method Investments [Line Items]
Dividend income			$ 10,360		$ 11,921
Warrants received (in shares)	6,182,000		4,472,000	6,182,000
Investments held at fair value	$ 9,198		$ 2,379	$ 9,198
Investment income and other, net
Schedule of Equity Method Investments [Line Items]
Income from equity method investments			48		4,800
Dividend income					$ 2,300
BATS
Schedule of Equity Method Investments [Line Items]
Number of shares sold		13,000,000
Remaining shares owned	206,000			206,000
Ownership percentage	0.50%
Investments held at fair value	$ 6,900			$ 6,900
Pre-tax gain from sale of investment			$ 4,800
Open Market Transactions | BATS
Schedule of Equity Method Investments [Line Items]
Number of shares sold				2,000,000
Block Sale | BATS
Schedule of Equity Method Investments [Line Items]
Number of shares sold				2,200,000.0
Swap Transaction
Schedule of Equity Method Investments [Line Items]
Warrants received (in shares)		8,100,000
Warrants retained (in shares)		1,100,000
Portion of transaction costs (in shares)		46,000
Swap Transaction | BATS
Schedule of Equity Method Investments [Line Items]
Number of shares exchanged in transaction		8,900,000
Number of shares retained in transaction	94,000			94,000
Receivable included in other assets	$ 2,900			$ 2,900
Liability included in accrued expenses and other liabilities	$ 2,900			$ 2,900
Fair value of portion of transaction costs		$ 1,400
Number of shares treated as derivatives	48,000			48,000
General Atlantic | Common Class A | Swap Transaction
Schedule of Equity Method Investments [Line Items]
Number of shares exchanged in transaction		18,700,000
Senior Secured Notes | 6.875% Senior Secured Notes
Schedule of Equity Method Investments [Line Items]
Interest rate (percent)	6.875%		6.875%	6.875%	6.875%	6.875%
Jefferies LLC | Swap Transaction
Schedule of Equity Method Investments [Line Items]
Payments of stock issuance costs		$ 2,900

XML

Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Assets held for sale		$ 8.2
Weighted average useful life	2 years	2 years
Minimum
Finite-Lived Intangible Assets [Line Items]
Amortization period	1 year
Maximum
Finite-Lived Intangible Assets [Line Items]
Amortization period	6 years
Market Making
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 16.4	$ 16.4

XML

Goodwill and Intangible Assets - Finite-Lived Intangible Assets, Net of Accumulated Amortization (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 205,076	$ 178,697
Accumulated amortization	(114,630)	(94,762)
Net carrying amount	90,446	83,935
Held for sale, intangibles		8,200
Technology
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	183,567	157,188
Accumulated amortization	(108,347)	(88,874)
Net carrying amount	$ 75,220	68,314
Held for sale, intangibles		$ 8,200
Amortization period	2 years	2 years
Trading rights
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 7,509	$ 7,509
Accumulated amortization	(491)	(482)
Net carrying amount	$ 7,018	$ 7,027
Amortization period	3 years	4 years
Indefinite-lived intangible assets	$ 6,900
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	13,000	$ 13,000
Accumulated amortization	(5,417)	(5,056)
Net carrying amount	$ 7,583	$ 7,944
Amortization period	5 years	6 years
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 1,000	$ 1,000
Accumulated amortization	(375)	(350)
Net carrying amount	$ 625	$ 650
Amortization period	6 years	7 years
Market Making
Finite-Lived Intangible Assets [Line Items]
Net carrying amount	$ 45,787	$ 46,563
Market Making | Technology
Finite-Lived Intangible Assets [Line Items]
Net carrying amount	38,759	39,536
Market Making | Trading rights
Finite-Lived Intangible Assets [Line Items]
Net carrying amount	7,028	7,027
Global Execution Services
Finite-Lived Intangible Assets [Line Items]
Net carrying amount	28,241	29,288
Global Execution Services | Technology
Finite-Lived Intangible Assets [Line Items]
Net carrying amount	20,033	20,694
Global Execution Services | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Net carrying amount	7,583	7,944
Global Execution Services | Trade names
Finite-Lived Intangible Assets [Line Items]
Net carrying amount	625	650
Corporate and Other | Technology
Finite-Lived Intangible Assets [Line Items]
Net carrying amount	$ 16,418	$ 8,084

XML

Goodwill and Intangible Assets - Summary of Amortization Expense Relating to Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 10,109	$ 7,559

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Goodwill and Intangible Assets - Summary of Estimated Amortization Expense for Future Years (Details) $ in Thousands	Mar. 31, 2017 USD ($)
Amortization expense
For the nine months ended December 31, 2017	$ 33,654
For the year ended December 31, 2018	32,749
For the year ended December 31, 2019	12,708
For the year ended December 31, 2020	2,009
For the year ended December 31, 2021	$ 1,544

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Debt - Summary of Long-Term Debt (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Mar. 10, 2015
Senior Secured Notes | 6.875% Senior Secured Notes
Debt Instrument [Line Items]
Interest rate (percent)	6.875%	6.875%	6.875%	6.875%
Aggregate principal amount	$ 465,000,000
Reported Value Measurement
Debt Instrument [Line Items]
6.875% Senior Secured Notes, $465.0 million par	462,141,000	$ 461,899,000
Deferred debt issuance costs	(6,958,000)	(7,546,000)
Total	455,183,000	454,353,000
Estimate of Fair Value Measurement
Debt Instrument [Line Items]
6.875% Senior Secured Notes, $465.0 million par	480,113,000	466,628,000
Deferred debt issuance costs	0	0
Total	$ 480,113,000	$ 466,628,000

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Debt - 6.875% Senior Secured Notes (Details) - USD ($)			3 Months Ended
	Mar. 13, 2015	Mar. 10, 2015	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Debt Instrument [Line Items]
Pretax gain from repurchase of debt			$ 0	$ 3,676,000
Accelerated amortization of debt issuance costs			$ 795,000	$ 821,000
Senior Secured Notes | 6.875% Senior Secured Notes
Debt Instrument [Line Items]
Interest rate (percent)		6.875%	6.875%	6.875%	6.875%
Aggregate principal amount			$ 465,000,000
Issuance of debt, percentage		98.962%
Proceeds from issuance of debt, net		$ 494,800,000
Yield to maturity, percentage		7.083%			7.59%
Percentage in voting equity interests of controlled foreign subsidiaries	66.00%
Redemption period		12 months
Repurchase of debt, par value amount				$ 35,000,000.0
Repurchase of debt				31,200,000
Accelerated original issue discount				300,000
Accelerated amortization of debt issuance costs				700,000
Senior Secured Notes | 6.875% Senior Secured Notes | Investment Income and Other, Net
Debt Instrument [Line Items]
Pretax gain from repurchase of debt				$ 3,700,000
Senior Secured Notes | 6.875% Senior Secured Notes | Related Parties
Debt Instrument [Line Items]
Payment of issuance costs to related party		$ 11,300,000
Senior Secured Notes | 6.875% Senior Secured Notes | Other Assets
Debt Instrument [Line Items]
Deferred debt costs		$ 12,600,000
Senior Secured Notes | 6.875% Senior Secured Notes | Minimum
Debt Instrument [Line Items]
Redemption notice, period		30 days
Senior Secured Notes | 6.875% Senior Secured Notes | Maximum
Debt Instrument [Line Items]
Redemption notice, period		60 days
Senior Secured Notes | 6.875% Senior Secured Notes | Jefferies LLC
Debt Instrument [Line Items]
Interest rate (percent)		6.875%
Aggregate principal amount		$ 500,000,000
Senior Secured Notes | 6.875% Indenture
Debt Instrument [Line Items]
Interest rate (percent)	6.875%

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Debt - Debt Redemption (Details) - Senior Secured Notes - 6.875% Senior Secured Notes	Mar. 10, 2015
2017
Debt Instrument [Line Items]
Percentage	103.438%
2018
Debt Instrument [Line Items]
Percentage	101.719%
2019 and thereafter
Debt Instrument [Line Items]
Percentage	100.00%

XML

Debt - Revolving Credit Agreement (Details) - KCGA	Jun. 05, 2015 USD ($) debt_class borrowing_base	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Revolving Credit Facility
Line of Credit Facility [Line Items]
Number of debt instruments | debt_class	2
Term credit agreement	$ 355,000,000	$ 0	$ 0
Revolving credit facility amount	500,000,000
Increase in line of credit facility, maximum borrowing capacity	$ 145,000,000
Commitment fee percentage of average daily amount unused portion of revolving credit agreement	0.40%
Revolving Credit Facility | Other Assets
Line of Credit Facility [Line Items]
Debt issuance costs	$ 1,700,000
Revolving Credit Facility | Borrowing Base A
Line of Credit Facility [Line Items]
Percentage points added to interest rate base	1.50%
Revolving Credit Facility | Borrowing Base B
Line of Credit Facility [Line Items]
Percentage points added to interest rate base	2.50%
Swingline Facility
Line of Credit Facility [Line Items]
Revolving credit facility amount	$ 50,000,000
Number of borrowing bases | borrowing_base	2
Swingline Facility | Borrowing Base A and Borrowing Base B
Line of Credit Facility [Line Items]
Revolving credit facility amount	$ 115,000,000

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Debt - Recorded Expenses with Respect to Long-term Debt (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Debt Disclosure [Abstract]
Interest expense	$ 8,234	$ 8,417
Amortization of debt issuance costs	795	821
Commitment fee	354	359
Accelerated amortization of debt issuance costs	0	738
Accelerated interest expense on repurchase of debt	0	298
Total	$ 9,383	$ 10,633

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Related Parties - Additional Information (Details) - Related Parties - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Treasury Stock
Related Party Transaction [Line Items]
Stock buyback program fees	$ 19	$ 36
Common Class A
Related Party Transaction [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners (more than)	10.00%

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Related Parties - Summary of Balances and Transactions with Related Parties or Their Affiliates (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Revenues
Commissions and fees	$ 93,589	$ 106,101
Trading revenues, net	154,307	223,938
Expenses
Execution and clearance fees	72,795	73,634
Communications and data processing	39,020	35,657
Payment for order flow	17,121	12,655
Collateralized financing interest	11,761	9,163
Other expense	8,197	9,201
Assets
Securities borrowed	1,594,442		$ 1,688,222
Receivable from brokers, dealers and clearing organizations	801,678		832,785
Other assets	192,359		164,168
Liabilities
Securities loaned	459,533		372,631
Payable to brokers, dealers and clearing organizations	495,253		518,900
Related Parties
Revenues
Commissions and fees	1,868	6,663
Trading revenues, net	791	477
Interest, net	119	103
Total revenues from related parties	2,778	7,243
Expenses
Execution and clearance fees	313	880
Communications and data processing	5,610	3,206
Payment for order flow	0	5
Collateralized financing interest	86	78
Other expense	0	5
Total expenses incurred with respect to related parties	6,009	$ 4,174
Assets
Securities borrowed	17,754		5,293
Receivable from brokers, dealers and clearing organizations	2,134		2,106
Other assets	16		62,906
Liabilities
Securities loaned	2,063		2,594
Payable to brokers, dealers and clearing organizations	45		188
Accrued expenses and other liabilities	$ 122		$ 3,708

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Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of options exercised	$ 2,200
Stock options exercised	$ 2,775	$ 0
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Restricted awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unamortized compensation related to restricted awards outstanding	$ 5,600
Cost of unvested awards expected to be recognized over a weighted average life, years	1 year 7 months 9 days
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Stock options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award expiration period	5 years
Stock options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award expiration period	10 years
SARs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
SARs granted (in shares)	0	0
Unamortized compensation costs	$ 500
Award expiration period	1 year 3 months
Stock options and SARs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of options exercised	$ 14,269
Stock options exercised		$ 2,800
Incentive units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation payable	$ 2,700		$ 2,300
KCG Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for grant (in shares)	23,200,000
Number of shares available for grant	13,600,000

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Stock-Based Compensation - Compensation Expense Relating to Restricted Awards (Details) - RSUs - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock award compensation expense	$ 2,438	$ 17,053
Income tax benefit	$ 926	$ 6,480

XML

Stock-Based Compensation - Summary of Restricted Awards Activity (Details) - RSUs shares in Thousands	3 Months Ended
	Mar. 31, 2017 $ / shares shares
Number of Units
Beginning Balance (in shares) | shares	5,563
Granted (in shares) | shares	800
Vested (in shares) | shares	(2,634)
Forfeited (in shares) | shares	(72)
Ending Balance (in shares) | shares	3,657
Weighted- Average Grant date Fair Value
Beginning Balance (in dollars per share) | $ / shares	$ 11.25
Granted (in dollars per share) | $ / shares	14.27
Vested (in dollars per share) | $ / shares	11.19
Forfeited (in dollars per share) | $ / shares	12.10
Ending Balance (in dollars per share) | $ / shares	$ 11.93

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Stock-Based Compensation - Compensation Expense Relating to Stock Options and SARs (Details) - Stock options and SARs - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option and SAR compensation expense	$ 122	$ 134
Income tax benefit	$ 46	$ 51

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Stock-Based Compensation - Summary of Stock Option and SAR Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) $ / shares shares
Weighted- Average Exercise Price
Aggregate Intrinsic Value, Exercisable | $	$ 2,200
Stock options and SARs
Number of Stock Awards
Beginning Balance (in shares)	6,298
Granted (in shares)	0
Exercised (in shares)	(337)
Forfeited or expired (in shares)	(94)
Ending Balance (in shares)	5,867
Exercisable (in shares)	4,492
Available for future grants (in shares)	13,630
Weighted- Average Exercise Price
Beginning Balance (in dollars per share) | $ / shares	$ 18.88
Granted (in dollars per share) | $ / shares	0.00
Exercised (in dollars per share) | $ / shares	8.24
Forfeited or expired (in dollars per share) | $ / shares	53.56
Ending Balance (in dollars per share) | $ / shares	19.03
Exercisable (in dollars per share) | $ / shares	$ 17.75
Aggregate Intrinsic Value, Outstanding | $	$ 14,269
Aggregate Intrinsic Value, Exercisable | $	$ 14,269
Weighted-Average Remaining Life, Outstanding	2 years 2 months 24 days
Weighted-Average Remaining Life, Exercisable	1 year 8 months 10 days
SARs
Number of Stock Awards
Beginning Balance (in shares)	1,700

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Stock-Based Compensation - Change in Incentive Units (Details) - Incentive Units - Common Class A shares in Thousands	3 Months Ended
	Mar. 31, 2017 shares
Vested
Beginning balance (in shares)	16
Issued (in shares)	0
Vested (in shares)	(1)
Exercised (in shares)	0
Canceled (in shares)	0
Ending balance (in shares)	15

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Stock-Based Compensation - Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Incentive units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense (benefit)	$ 437	$ (77)

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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Effective tax rate (percent)	894.00%	38.00%
Federal statutory income tax rate (percent)	35.00%	35.00%
Excess tax benefits for stock based compensation awards	$ 3.5
Unrecognized tax benefits that would impact effective tax rate if recognized	$ 5.3		$ 5.1

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Accumulated Other Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 1,357,283
Ending balance	1,347,312
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	2,247	$ 350
Other comprehensive income (loss)	607	(65)
Amount reclassified from Available-for-sale securities, net of tax	(2,956)
Ending balance	(102)	285
Unrealized Gains (Losses) on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	3,286	150
Other comprehensive income (loss)	170	68
Amount reclassified from Available-for-sale securities, net of tax	(2,956)
Ending balance	500	218
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(1,039)	200
Other comprehensive income (loss)	437	(133)
Amount reclassified from Available-for-sale securities, net of tax	0
Ending balance	$ (602)	$ 67

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Accumulated Other Comprehensive Income - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Investment income and other, net	$ 6,656	$ 15,268
Income tax (benefit) expense	3,616	$ (22,800)
Unrealized Gains (Losses) on Available-for-Sale Securities | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Investment income and other, net	4,767
Income tax (benefit) expense	(1,811)
Net of tax	$ 2,956

XML

Warrants and Stock Repurchases - Additional Information (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Mar. 10, 2015	Jul. 01, 2013
Class of Stock [Line Items]
Warrants received (in shares)	4,472		6,182
Warrants repurchased (in shares)	1,077	1,500
Warrants repurchased	$ 2,900	$ 1,000
KCG Class A Common Stock repurchased	28,849
Remaining authorized repurchase amount	$ 136,800
Senior Secured Notes | 6.875% Senior Secured Notes
Class of Stock [Line Items]
Interest rate (percent)	6.875%	6.875%	6.875%	6.875%
GETCO
Class of Stock [Line Items]
Warrants received (in shares)					24,300
Common Class A
Class of Stock [Line Items]
KCG Class A Common Stock repurchased (in shares)	900	1,800
KCG Class A Common Stock repurchased	$ 13,300	$ 20,500

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Warrants and Stock Repurchases - Warrant Activity (Details) - $ / shares shares in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Jul. 01, 2013
Class of Warrant or Right [Roll Forward]
Warrants - Outstanding at beginning of period (in shares)	6,182
Exercised (in shares)	(633)
Repurchased (in shares)	(1,077)	(1,500)
Warrants - Outstanding at end of period (in shares)	4,472
Class A
Class of Warrant or Right [Line Items]
Exercise Price (in dollars per share)	$ 11.70		$ 12.00
Initial term (years)	4 years
Class of Warrant or Right [Roll Forward]
Warrants - Outstanding at beginning of period (in shares)	2,026
Exercised (in shares)	(545)
Repurchased (in shares)	(359)
Warrants - Outstanding at end of period (in shares)	1,122
Class B
Class of Warrant or Right [Line Items]
Exercise Price (in dollars per share)	$ 13.16		13.50
Initial term (years)	5 years
Class of Warrant or Right [Roll Forward]
Warrants - Outstanding at beginning of period (in shares)	2,069
Exercised (in shares)	(44)
Repurchased (in shares)	(359)
Warrants - Outstanding at end of period (in shares)	1,666
Class C
Class of Warrant or Right [Line Items]
Exercise Price (in dollars per share)	$ 14.63		$ 15.00
Initial term (years)	6 years
Class of Warrant or Right [Roll Forward]
Warrants - Outstanding at beginning of period (in shares)	2,087
Exercised (in shares)	(44)
Repurchased (in shares)	(359)
Warrants - Outstanding at end of period (in shares)	1,684

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Earnings Per Share - Additional Information (Details) - shares shares in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Options excluded (in shares)	3.8	23.8

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Earnings Per Share - Reconciliation of Numerators and Denominators of Basic and Diluted Earnings Per Computations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Numerator / net income
Income and shares used in basic calculations	$ 3,212	$ 37,165
Denominator / shares
Income and shares used in basic calculations (in shares)	66,306	88,458
Income and shares used in diluted calculations (in shares)	67,642	89,605
Basic earnings per share (in dollars per share)	$ 0.05	$ 0.42
Diluted earnings per share (in dollars per share)	$ 0.05	$ 0.41
Restricted awards
Denominator / shares
Effect of dilutive stock based awards (in shares)	800	992
Stock options and SARs
Denominator / shares
Effect of dilutive stock based awards (in shares)	536	155

XML

Commitments and Contingent Liabilities - Additional Information (Details)	3 Months Ended
	Mar. 31, 2017 USD ($) loan	Mar. 31, 2016 USD ($)	Jul. 08, 2016 EUR (€)
Occupancy and Equipment Rentals
Loss Contingencies [Line Items]
Rental expense under the office leases	$ 4,700,000	$ 6,100,000
Revolving Credit Facility
Loss Contingencies [Line Items]
Weighted average interest rate	4.42%
Debt term	3 years
Trading Activities on Euronext
Loss Contingencies [Line Items]
Loss contingency reserve | €			€ 400,000
Guarantee Obligation
Loss Contingencies [Line Items]
Letters of credit obligation	$ 10,200,000
Indemnification Agreement
Loss Contingencies [Line Items]
Number of loans with contingent potential obligation | loan	40
Indemnification Agreement | Maximum
Loss Contingencies [Line Items]
Potential losses on loans	$ 10,100,000.0

XML

Commitments and Contingent Liabilities - Schedule of Capital Lease and Contract Obligations (Details) $ in Thousands	Mar. 31, 2017 USD ($)
Minimum Payments
Nine months ending December 31, 2017	$ 5,625
Year ending December 31, 2018	7,272
Year ending December 31, 2019	7,272
Year ending December 31, 2020	1,103
Total	$ 21,272

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Commitments and Contingent Liabilities - Schedule of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Interest expense - Capital leases	$ 24	$ 24

XML

Commitments and Contingent Liabilities - Schedule of Future Minimum Rental Commitments (Details) $ in Thousands	Mar. 31, 2017 USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Nine months ending December 31, 2017	$ 17,484
Year ending December 31, 2018	22,128
Year ending December 31, 2019	19,802
Year ending December 31, 2020	19,254
Year ending December 31, 2021	18,732
Thereafter through December 31, 2031	144,138
Total	241,538
Gross Lease Obligations
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Nine months ending December 31, 2017	22,057
Year ending December 31, 2018	27,978
Year ending December 31, 2019	25,031
Year ending December 31, 2020	23,310
Year ending December 31, 2021	22,771
Thereafter through December 31, 2031	154,234
Total	275,381
Sublease Income
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Nine months ending December 31, 2017	4,573
Year ending December 31, 2018	5,850
Year ending December 31, 2019	5,229
Year ending December 31, 2020	4,056
Year ending December 31, 2021	4,039
Thereafter through December 31, 2031	10,096
Total	$ 33,843

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Commitments and Contingent Liabilities - Activity in Liability Account Related to Office Space Consolidation (Details) - Office Space Consolidation - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Restructuring Reserve [Roll Forward]
Balance as of beginning of period	$ 14,251	$ 18,892
Real estate charges incurred	0	390
Payments made, net	(1,566)	(3,750)
Interest accretion	884	(1,281)
Balance as of end of period	$ 13,569	$ 14,251

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Financial instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Loans outstanding	$ 455,183,000	$ 454,353,000
Executive Director or Officer
Derivatives, Fair Value [Line Items]
Loans outstanding	$ 0

XML

Business Segments - Revenue and Pre-tax Earnings by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenues	$ 255,373	$ 345,424
Pre-tax earnings	(404)	59,965
Total assets	5,983,429	6,196,298	$ 6,261,287
Market Making
Segment Reporting Information [Line Items]
Revenues	174,656	258,918
Pre-tax earnings	18,023	75,489
Total assets	5,255,849	4,999,201
Global Execution Services
Segment Reporting Information [Line Items]
Revenues	70,756	76,394
Pre-tax earnings	1,994	6,261
Total assets	1,001,933	1,020,306
Corporate and Other
Segment Reporting Information [Line Items]
Revenues	9,961	10,112
Pre-tax earnings	(20,421)	(21,785)
Total assets	$ (274,353)	$ 176,791

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Business Segments - Additional Information (Details) - USD ($) $ in Millions	Dec. 31, 2016	Mar. 31, 2016
Segment Reporting Information [Line Items]
Total assets of businesses held for sale	$ 8.2
Market Making | Businesses Held for Sale
Segment Reporting Information [Line Items]
Total assets of businesses held for sale		$ 16.4
Corporate and Other | Businesses Held for Sale
Segment Reporting Information [Line Items]
Total assets of businesses held for sale		$ 8.1

XML

Subsequent Events (Details)	Apr. 20, 2017 $ / shares
Agreement and Plan of Merger with Virtu Financial, Inc. | Subsequent Event
Subsequent Event [Line Items]
Cash exercise price of right (in usd per share)	$ 20.00