On April 4, 2024, Richard Prager notified MarketAxess Holdings Inc. that he will not stand for re-election to the Company?s Board of Directors (the ?Board?) when his current term expires following the Company?s 2024 Annual Meeting of Stockholders (the ?2024 Annual Meeting?) in order to focus on other commitments. Mr. Prager?s decision was not due to any disagreement with the Company. The Board anticipates that it will reduce the size of the Board to eleven directors, effective following the 2024 Annual Meeting.