MarketAxess Holdings Inc. announced on January 18, 2024, the board of directors (Board) of the company appointed Christopher R. Concannon, chief executive officer as interim chief financial officer, effective February 1, 2024. The board is actively conducting a formal search process for the role. Mr. Concannon will serve as chief executive officer and interim chief financial officer and will fulfill the functions of the principal financial officer of the company, until a permanent chief financial officer has been appointed.