X0508 4 2026-02-13 0001278021 MARKETAXESS HOLDINGS INC MKTX 0001913806 Panchal Naineshkumar Shantilal C/O MARKETAXESS HOLDINGS INC. 55 HUDSON YARDS, 15TH FLOOR NEW YORK NY 10001 false true false false Chief Information Officer false Common Stock, par value $0.003 per share 2026-02-13 4 A false 394 0 A 10737 D Common Stock, par value $0.003 per share 2026-02-15 4 F false 159 179.36 D 10578 D Common Stock, par value $0.003 per share 2026-02-15 4 A false 3239 0 A 13817 D Common Stock, par value $0.003 per share 2026-02-15 4 F false 1016 179.36 D 12801 D On February 13, 2026, the Compensation and Talent Committee of the Board of Directors of the Issuer certified the performance metrics relating to the performance stock units granted to the Reporting Person on February 15, 2023. Represents the surrender of shares to the Company to satisfy the Reporting Person's tax withholding obligation upon the vesting of the performance stock units. Represents a grant of restricted stock units pursuant to the Company's 2020 Equity Incentive Plan. The restricted stock units shall vest 34% on February 15, 2027, 33% on February 15, 2028, and 33% on February 15, 2029. Represents the surrender of shares to the Company to satisfy the Reporting Person's tax withholding obligation upon the vesting of restricted stock units previously granted to the Reporting Person. /s/ Patrick Wilson as Attorney-in-Fact for Naineshkumar S. Panchal 2026-02-17