Kiniksa annual meeting elects three directors, ratifies auditor, approves say-on-pay

Proposal 3 – The approval, on a non-binding, advisory basis, of the compensation of our named executive officers as disclosed in the Company’s proxy statement for the Annual Meeting pursuant to the applicable compensation disclosure rules of the Securities and Exchange Commission, including the compensation tables and narrative discussion. Votes FOR Votes AGAINST Votes ABSTAINED Broker Non-Votes 40,423,385 1,270,222 380,052 3,132,968

Proposal 1 – The election of Stephen R. Biggar, G. Bradley Cole and Barry D. Quart as Class II Directors to serve until the 2026 Annual Meeting of Shareholders and until their respective successors have been duly elected and qualified. Nominee Votes FOR Votes WITHHELD Broker Non-Votes Stephen R. Biggar 30,959,772 11,113,887 3,132,968 G. Bradley Cole 40,974,400 1,099,259 3,132,968 Barry D. Quart 40,953,831 1,119,828 3,132,968

Proposal 2 – The (a) appointment of PricewaterhouseCoopers LLP as the Company’s auditor until the close of the Company’s next Annual Meeting of Shareholders, (b) delegation to the Company’s Board of Directors, through the Audit Committee of the Board of Directors, of the authority to set the auditor’s remuneration for such period, and (c) ratification of the appointment of PricewaterhouseCoopers LLP as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2023. Votes FOR Votes AGAINST Votes ABSTAINED Broker Non-Votes 44,804,941 23,637 378,049 0