Equillium stockholders approve reverse stock split authorization at 2023 annual meeting

Proposal 4. Authorization to Adjourn the Annual Meeting, if Necessary, to Solicit Additional Proxies if there are Not Sufficient Votes in Favor of Proposal 2. The Company’s stockholders authorized the adjournment of the Annual Meeting, if necessary, to solicit additional proxies if there were an insufficient number of votes in favor of Proposal 2. The final voting results are as follows: Votes For Votes Against Abstentions Broker Non-Votes 27,292,976 1,401,155 569,006 0

Proposal 1. Election of Directors. The Company’s stockholders elected the three persons listed below as Class II directors, each to serve until the Company’s 2026 Annual Meeting of Stockholders and until his or her respective successor has been duly elected and qualified, or until his or her earlier death, resignation or removal. The final voting results are as follows: Name Votes For Votes Withheld Broker Non-Votes Charles McDermott 16,956,930 2,735,613 9,570,594 Bruce Steel 18,638,321 1,054,222 9,570,594 Yu (Katherine) Xu, Ph.D. 19,509,865 182,678 9,570,594

Proposal 3. Ratification of the Selection of Independent Registered Public Accounting Firm. The Company’s stockholders ratified the selection by the Audit Committee of the Company’s Board of Directors of KPMG LLP as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2023. The final voting results are as follows: Votes For Votes Against Abstentions Broker Non-Votes 27,948,378 745,510 569,249 0

Proposal 2. Approval of Amendment to the Company’s Amended and Restated Certificate of Incorporation to Effect a Reverse Stock Split. The Company’s stockholders approved an amendment to the Company’s Amended and Restated Certificate of Incorporation to effect a reverse stock split of the Company’s common stock at a ratio in the range of 1-for-2 to 1-for-10, with such ratio to be determined in the discretion of the Company’s Board of Directors and with such reverse stock split to be effected at such time and date, if at all, as determined by the Company’s Board of Directors in its sole discretion. The final voting results are as follows: Votes For Votes Against Abstentions Broker Non-Votes 27,178,585 1,520,289 564,263 0