X0306 4 2019-05-22 0 0001278021 MARKETAXESS HOLDINGS INC MKTX 0001296466 McVey Richard M C/O MARKETAXESS HOLDINGS INC. 55 HUDSON YARDS, 15TH FLOOR NEW YORK NY 10001 1 1 0 0 Chairman & CEO Common Stock, par value $0.003 per share 2019-05-22 4 M 0 19800 A 1025931 D Common Stock, par value $0.003 per share 2000 I By Immediate Family Members Performance Shares 2019-05-22 4 M 0 19800 D Common Stock 19800 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 November 8, 2018 to November 8, 2023. On May 22, 2019, the Company issued 19,800 shares of restricted stock pursuant to the achievement of such performance objectives. The restricted stock will vest on November 8, 2023. /s/ Jason Edelstein, as Attorney-in-Fact for Richard M. McVey 2019-05-23