MarketAxess holds 2023 annual meeting; all director nominees elected, say-on-pay approved

Proposal 3 — Advisory vote on the compensation of the Company’s named executive officers as disclosed in the proxy statement pursuant to the SEC’s compensation disclosure rules (referred to as the “say-on-pay” proposal). The results were as follows: For Against Abstain Broker Non-Votes 31,343,829 1,263,949 1,300,095 982,528

Proposal 1 — Election of Directors. The results were as follows: Director For Against Abstain Broker Non-Votes Richard M. McVey 33,077,416 823,255 7,202 982,528

Proposal 2 — Ratification of the selection of PricewaterhouseCoopers LLP as the Company’s independent registered public accounting firm for the year ending December 31, 2023. The results were as follows: For Against Abstain 31,993,356 2,818,750 78,295

Proposal 4 — Advisory vote on the frequency of future advisory votes on the compensation of the Company’s named executive officers. The results are below. One year received the greatest number of votes. Based on these results, and consistent with the Board’s recommendation, the Board has determined that the Company will hold an advisory vote on the compensation of its named executive officers on an annual basis until the next stockholder advisory vote on the frequency of the advisory vote on the compensation of its named executive officers. One Year Two Years Three Years Abstain Broker Non-Votes 33,586,239 2,433 306,382 12,819 982,528