Results of Operations and Financial Condition. On October 23, 2026, MarketAxess Holdings Inc. (the “Company”) issued a press release announcing the Company’s financial results for its third quarter ended September 30, 2026. A copy of this press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. The information included in this Current Report on Form 8-K (including Exhibit 99.1 hereto) that is furnished pursuant to this

Other Events. On October 23, 2026, the Company also announced that its Board of Directors has declared a regular quarterly dividend to be paid to the holders of the outstanding shares of capital stock. A cash dividend of $0.78 per share of common stock outstanding will be paid on November 25, 2026 to stockholders of record as of the close of business on November 11, 2026.

Other Events. As previously announced, on July 29, 2026, MarketAxess Holdings Inc., a Delaware corporation (the “Company” or “MarketAxess”), entered into an Agreement and Plan of Merger (as the same may be amended, modified or supplemented from time to time in accordance with its terms, the “Merger Agreement”), by and among the Company, Intercontinental Exchange, Inc., a Delaware corporation (“Parent”), and Igloo Merger Sub II, Inc., a Delaware corporation and a wholly owned subsidiary of Par…

Other Events. On July 30, 2026, the Company also announced that its Board of Directors has declared a regular quarterly dividend to be paid to the holders of the outstanding shares of capital stock. A cash dividend of $0.78 per share of common stock outstanding will be paid on September 2, 2026 to stockholders of record as of the close of business on August 19, 2026.

Results of Operations and Financial Condition. On July 30, 2026, MarketAxess Holdings Inc. (the “Company”) issued a press release announcing the Company’s financial results for its second quarter ended June 30, 2026. A copy of this press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. The information included in this Current Report on Form 8-K (including Exhibit 99.1 hereto) that is furnished pursuant to this

Amendments to severance agreements for the CEO, CFO, and General Counsel were made.

Entry into a Material Definitive Agreement. On July 29, 2026, MarketAxess Holdings Inc., a Delaware corporation (the “ Company ”), entered into an Agreement and Plan of Merger (the “ Merger Agreement ”), by and among the Company, Intercontinental Exchange, Inc., a Delaware corporation (“ Parent ”), and Igloo Merger Sub II, Inc., a Delaware corporation and a wholly owned subsidiary of Parent (“ Merger Sub ”), pursuant to which, upon the terms and subject to the conditions set forth therein, Me…

Other Events. On May 7, 2026, the Company also announced that its Board of Directors has declared a regular quarterly dividend to be paid to the holders of the outstanding shares of capital stock. A cash dividend of $0.78 per share of common stock outstanding will be paid on June 3, 2026 to stockholders of record as of the close of business on May 20, 2026.

Results of Operations and Financial Condition. On May 7, 2026, MarketAxess Holdings Inc. (the “Company”) issued a press release announcing the Company’s financial results for its first quarter ended March 31, 2026. A copy of this press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. The information included in this Current Report on Form 8-K (including Exhibit 99.1 hereto) that is furnished pursuant to this

Mr. Cifu and Mr. Schiciano: Appointments to serve on the Board’s committees were made.

Chief Information Officer — Naineshkumar Panchal: Mr. Panchal's separation is considered a termination without Cause and he will receive severance payments.

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information set forth under

Other Events. On February 6, 2026, the Company also announced that its Board of Directors has declared a regular quarterly dividend to be paid to the holders of the outstanding shares of capital stock. A cash dividend of $0.78 per share of common stock outstanding will be paid on March 4, 2026 to stockholders of record as of the close of business on February 18, 2026.

Results of Operations and Financial Condition. On February 6, 2026, the Company issued a press release announcing the Company’s financial results for its fourth quarter and year ended December 31, 2025. A copy of this press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. The information included in this Current Report on Form 8-K (including Exhibit 99.1 hereto) that is furnished pursuant to this

Entry into a Material Definitive Agreement. On February 4, 2026, MarketAxess Holdings Inc. (the “Company”), as borrower, entered into an Amended and Restated Credit Agreement (the “A&R Credit Agreement”) with a syndicate of lenders and JPMorgan Chase Bank, N.A. (“JPMorgan”), as administrative agent. The A&R Credit Agreement amends and restates in its entirety that certain Credit Agreement, dated August 9, 2023, among the Company, as borrower, a syndicate of lenders and JPMorgan, as administra…

Director — Douglas A. Cifu, Kenneth T. Schiciano: The filing discloses the routine election of two new independent directors to the board, which is a standard governance event and not an executive departure.

Regulation FD Disclosure. On December 9, 2025, MarketAxess Holdings Inc. (the “Company”) issued a press release announcing the Company's medium-term financial targets, an increase in its share repurchase authorization and its intention to enter into an accelerated stock repurchase. A copy of this press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. The information included in this Current Report on Form 8-K (including Exhibit 99.1 hereto) that is furnished…

Results of Operations and Financial Condition. On November 7, 2025, MarketAxess Holdings Inc. (the “Company”) issued a press release announcing the Company’s financial results for its third quarter ended September 30, 2025. A copy of this press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. The information included in this Current Report on Form 8-K (including Exhibit 99.1 hereto) that is furnished pursuant to this

Other Events. On November 7, 2025, the Company also announced that its Board of Directors has declared a regular quarterly dividend to be paid to the holders of the outstanding shares of capital stock. A cash dividend of $0.76 per share of common stock outstanding will be paid on December 3, 2025 to stockholders of record as of the close of business on November 19, 2025.

Other Events On August 6, 2025, the Company also announced that its Board of Directors has declared a regular quarterly dividend to be paid to the holders of the outstanding shares of capital stock. A cash dividend of $0.76 per share of common stock outstanding will be paid on September 3, 2025 to stockholders of record as of the close of business on August 20, 2025.

Results of Operations and Financial Condition On August 6, 2025, MarketAxess Holdings Inc. (the “Company”) issued a press release announcing the Company’s financial results for its second quarter ended June 30, 2025. A copy of this press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. The information included in this Current Report on Form 8-K (including Exhibit 99.1 hereto) that is furnished pursuant to this

Chief Accounting Officer — Nitin A. Mirwani: The filing announces the appointment of an external candidate as Chief Accounting Officer, replacing an interim officer who remains with the company in a different role.

Group Chief Operating Officer and Chief Executive Officer, EMEA & APAC — Dean Berry: The filing announces the appointment of an external candidate to a senior executive role (Group COO and CEO EMEA & APAC), which is a new hire rather than a departure.

Results of Operations and Financial Condition On May 7, 2025, MarketAxess Holdings Inc. (the “Company”) issued a press release announcing the Company’s financial results for its first quarter ended March 31, 2025. A copy of this press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. The information included in this Current Report on Form 8-K (including Exhibit 99.1 hereto) that is furnished pursuant to this

Other Events On May 7, 2025, the Company also announced that its Board of Directors has declared a regular quarterly dividend to be paid to the holders of the outstanding shares of capital stock. A cash dividend of $0.76 per share of common stock outstanding will be paid on June 4, 2025 to stockholders of record as of the close of business on May 21, 2025.