MarketAxess Holdings Inc. filed an amendment to a previous report to specify committee assignments for two directors elected earlier in the year. Douglas A. Cifu has been appointed to the Compensation and Talent Committee and the Finance Committee. Kenneth T. Schiciano has been appointed to the Audit Committee. The committee appointments were determined by the Board of Directors on April 15, 2026. Both directors originally joined the board effective March 1, 2026.