Exhibit 99.1

KCG ANNOUNCES CONSOLIDATED EARNINGS OF $0.30

PER DILUTED SHARE FOR THE FIRST QUARTER OF 2014

Consolidated revenues of $383.7 million

and pre-tax earnings of $59.4 million during the quarter

KCG Board of Directors authorizes an initial $150 million share repurchase program

JERSEY CITY, New Jersey – May 2, 2014 – KCG Holdings, Inc. (NYSE: KCG) today reported consolidated earnings of $35.7 million, or $0.30 per diluted share, for the first quarter of 2014.

Net income for the first quarter of 2014 included income from continuing operations, net of tax, of $36.9 million, or $0.31 per diluted share. Pre-tax income from continuing operations for the quarter of $59.4 million included income of $1.8 million from investment gains net of asset write down charges. The $1.8 million comprised revenue of $9.6 million recognized by the Company with respect to its investments in BATS Global Markets, Inc. (“BATS”) and Direct Edge Holdings LLC (“Direct Edge”), which merged during the first quarter, a $7.6 million write down of capitalized debt costs related to the principal repayments of debt, and a lease loss accrual. Excluding these items, pre-tax income from continuing operations for the first quarter was $57.6 million. A reconciliation of GAAP to non-GAAP results is included in Exhibit 4.

KCG was formed July 1, 2013 as a result of the merger between Knight Capital Group, Inc. and GETCO Holding Company, LLC (“the Merger”). Financial results for the periods prior to the third quarter of 2013 contained herein solely represent the results of GETCO Holding Company, LLC as the accounting acquirer.

Select Financial Results

First Quarter Highlights

Daniel Coleman, Chief Executive Officer of KCG, said, “During the first quarter, KCG began to demonstrate the potential earnings power of our model. We apply advanced technologies to market making, agency execution and trading venues in order to serve clients, attain scale and drive margin expansion. As integration activities subside, we’re devoting greater attention to organic growth opportunities from core capabilities. The revenue and margin improvement during the first quarter reflects progress to date in enhancing core capabilities as well as reducing the cost structure.”

In the first quarter of 2014, the Company began to charge the Market Making and Global Execution Services segments for the cost of aggregate debt interest. The interest amount charged to each of the segments is determined based on capital limits and requirements. Historically, debt interest was included within the Corporate and Other segment. This change in the measurement of segment profitability has no impact to the consolidated results, will only be reported prospectively and therefore will not be reflected in any prior period financial results.

Market Making

During the first quarter of 2014, the Market Making segment generated total revenues of $277.3 million and pre-tax income of $76.0 million, which included a debt interest charge of $7.2 million. In the fourth quarter of 2013, Market Making reported total revenues of $232.5 million and pre-tax income of $48.0 million.

This segment encompasses direct-to-client and exchange-based market making across multiple asset classes and is an active participant in all major cash, options and futures markets in the U.S. and Europe. The strong performance during the quarter was driven primarily by direct-to-client market making in U.S. equities. Contributing factors include the effectiveness of order execution models, greater efficiencies of scale and improved market conditions, in particular, a quarter-on-quarter rise in overall retail volume. In addition, fixed income market making offering GETDirect, which provides a bilateral market for U.S. Treasuries, recorded strong quarter-on-quarter growth in clients and average daily volume.

Select Trade Statistics: U.S. Equity Market Making

Global Execution Services

During the first quarter of 2014, the Global Execution Services segment generated total revenues of $87.2 million and pre-tax income of $2.0 million, which included a debt interest charge of $2.4 million. In the fourth quarter of 2013, Global Execution Services reported total revenues of $84.1 million and a pre-tax loss of $4.5 million.

The Global Execution Services segment comprises agency execution services and trading venues. The solid performance of institutional equities during the quarter was the result of closer coordination of sales, adjustments to the cost structure and a modest uptick in institutional trading of global equities. Institutional equity sales trading in the U.S. and U.K. made solid contributions while KCG’s algorithmic and EMS executions set a quarterly record for average daily U.S. equity share volume. Among KCG’s trading venues, KCG Hotspot grew average daily notional FX dollar value traded quarter-on-quarter and KCG BondPoint set a quarterly record for average daily fixed income par value traded.

Select Trade Statistics: Agency Execution and Trading Venues

Corporate and Other

The Corporate and Other segment includes strategic investments and corporate overhead expenses. During the first quarter of 2014, the Corporate and Other segment recorded total revenues of $19.1 million and a pre-tax loss of $18.7 million. Included in the results was revenue of $9.6 million resulting from the merger of BATS and Direct Edge, a $7.6 million write down of capitalized debt costs related to the principal repayment of debt and a lease loss accrual. Excluding these items, the Corporate and Other segment’s pre-tax loss for the first quarter was $20.8 million.

The $9.6 million revenue related to the merger of BATS and Direct Edge comprises a partial realized gain with respect to KCG’s investment in Direct Edge offset, in part, by KCG’s share of expenses incurred by BATS and Direct Edge in connection with the merger. Prior to the merger, KCG accounted for its strategic investment in BATS under the cost method and accounted for its investment in Direct Edge under the equity method. Following the merger, KCG owns 16.7% of the overall equity of BATS and 19.9% of the voting equity and will account for its interest in BATS under the equity method. This change in accounting principle is applied retrospectively and, as such, KCG will present its financial results for all prior periods with BATS accounted for under the equity method.

Financial Condition

As of March 31, 2014, KCG had approximately $651.1 million in cash and cash equivalents. Total outstanding debt was approximately $472.3 million. The company had $1.6 billion in stockholders’ equity equivalent to a book value of $12.46 per share and tangible book value of $10.85 per share.

KCG’s headcount at March 31, 2014 was 1,230 full-time employees as compared to 1,229 full-time employees at December 31, 2013.

Subsequent Events

Subsequent to the first quarter, on May 1, 2014, KCG’s Board of Directors approved an initial program to repurchase up to a total of $150 million in shares of the Company’s outstanding Class A Common Stock (“Common Stock”) and warrants to purchase shares of Common Stock (“Warrants”), subject to compliance with the covenants contained in the Company’s debt indenture. Under the program, the Company may repurchase shares or Warrants from time to

time in open market transactions, accelerated stock buyback programs, tender offers, privately-negotiated transactions or by other means. Repurchases of shares may also be made under a Rule 10b5-1 plan. The timing and amount of repurchase transactions will be based on market conditions, share price, legal requirements and other factors. The program has no expiration date and may be suspended, modified or discontinued at any time without prior notice. There are no assurances that any repurchases of shares of Common Stock or Warrants may actually occur. As of May 1, 2014, the Company had approximately 125.7 million shares of Common Stock outstanding, including restricted stock units (“RSUs”) and 24.3 million outstanding Warrants.

On April 15, 2014, KCG completed an additional $50.0 million principal repayment on the Company’s $535.0 million first lien term loan entered into on July 1, 2013. With this repayment, KCG has fully repaid the loan and terminated the facility ahead of its December 5, 2017 maturity date.

Conference Call

KCG will hold a conference call to discuss first quarter 2014 financial results starting at 9:00 a.m. Eastern Time today, May 2, 2014. To access the call, dial 888-713-3596 (domestic) or 913-312-1507 (international) and enter passcode 1591513. In addition, the call will be webcast at http://www.media-server.com/m/acs/9b2975bbe5e318d76e0c3bd2a11393a2. Following the conclusion of the call, a replay will be available by dialing 888-203-1112 (domestic) or 719-457-0820 (international) and entering passcode 1591513.

Additional information for investors can be found at http://investors.kcg.com.

Non-GAAP Financial Presentations

KCG believes that certain non-GAAP financial presentations, when taken into consideration with the corresponding GAAP financial presentations, are important in understanding operating results. Selected financial information is included in the non-GAAP financial presentations for the three months ended March 31, 2014, December 31, 2013 and March 31, 2013. KCG believes the presentations provide a meaningful summary of results of operations for each of the three month periods. Reconciliations of GAAP to non-GAAP results are included in the schedules in Exhibit 4.

About KCG

KCG is a leading independent securities firm offering investors and clients a range of services designed to address trading needs across asset classes, product types and time zones. The firm combines advanced technology with exceptional client service across market making, agency execution and venues. KCG has multiple access points to trade global equities, fixed income, currencies and commodities via voice or automated execution. www.kcg.com

Certain statements contained 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’s industry, management’s beliefs and certain assumptions made by management, many of which, by their nature, are inherently uncertain and beyond our control. Any forward-looking statement contained herein speaks only as of the date on which it is made. 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 strategic business combination (the “Mergers”) of Knight Capital Group, Inc. (“Knight”) and GETCO Holding Company, LLC (“GETCO”), including, among other things, (a) difficulties and delays in integrating the Knight and GETCO businesses or fully realizing cost savings and other benefits, (b) the inability to sustain revenue and earnings growth, and (c) customer and client reactions to the Mergers; (ii) the August 1, 2012 technology issue that resulted in Knight’s broker-dealer subsidiary sending numerous erroneous orders in NYSE-listed and NYSE Arca securities into the market and the impact to Knight’s capital structure and business as well as actions taken in response thereto and consequences thereof; (iii) the costs and risks associated with the sale of Knight’s institutional fixed income sales and trading business, the sale of KCG’s reverse mortgage origination and securitization business and the departure of the managers of KCG’s listed derivatives group; (iv) changes in market structure, legislative, regulatory or financial reporting rules,

including the increased focus by regulators, the New York Attorney General, Congress and the media on market structure issues, and in particular, the scrutiny of high frequency trading, market fragmentation, colocation, access to market data feeds, and remuneration arrangements such as payment for order flow and exchange fee structures; (v) past or future changes to organizational structure and management; (vi) 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; (vii) KCG’s ability to keep up with technological changes; (viii) KCG’s ability to effectively identify and manage market risk, operational and technology risk, legal risk, liquidity risk, reputational risk, counterparty and credit risk, international risk, regulatory risk, and compliance risk; (ix) the cost and other effects of material contingencies, including litigation contingencies, and any adverse judicial, administrative or arbitral rulings or proceedings; and (x) the effects of increased competition and KCG’s ability to maintain and expand market share. The list above is not exhaustive. Readers should carefully review the risks and uncertainties disclosed in KCG’s reports with the SEC, including, without limitation, those detailed under “Risk Factors” in KCG’s Annual Report on Form 10-K/A for the year-ended December 31, 2013, and other reports or documents KCG files with, or furnishes to, the SEC from time to time.

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First quarter 2013 reflects solely the results of GETCO Holding Company, LLC.

First quarter 2014 and fourth quarter 2013 includes the results of KCG Holdings, Inc.

First quarter 2013 reflects solely the results of GETCO Holding Company, LLC.

First quarter 2013 reflects solely the results of GETCO Holding Company, LLC.