X0306 4 2019-05-14 0 0001278021 MARKETAXESS HOLDINGS INC MKTX 0001251713 CONCANNON CHRISTOPHER R C/O MARKETAXESS HOLDINGS INC. 55 HUDSON YARDS, 15TH FLOOR NEW YORK NY 10001 1 1 0 0 President & COO Common Stock, par value $0.003 per share 2019-05-14 4 M 0 8969 A 36964 D Performance Shares 2019-05-14 4 M 0 8969 D Common Stock 8969 0 D Each performance share represented a contingent right to receive a share of the Company's common stock upon the Company's attainment of certain levels of average price per share of the common stock, calculated based on the closing price of the common stock over any twenty consecutive trading days during the period from January 22, 2019 to January 22, 2024. On May 14, 2019, the Company issued 8,969 shares of restricted stock pursuant to the achievement of such performance objectives. The restricted stock will vest on January 22, 2024. Exhibit 24 - Power of Attorney /s/ Jason Edelstein, as Attorney-in-Fact for Christopher R. Concannon 2019-05-16