Terrestrial Energy Inc. /DE/

The form of proxy solicited by the Board permits you to specify a (i) choice among “for” and “withhold” for each of the three director nominees, and (ii) a choice among “for,” “against,” and “abstain” with respect to the ratification of the appointment of UHY LLP as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2026. All shares of Common Stock and Special Voting Stock as of the close of business on the Record Date represented by valid proxies that the Company receives through this solicitation, and that are not validly revoked, will be voted according to your instructions on the proxy card or as instructed by phone or via the Internet. If you properly submit a proxy without giving specific voting instructions, your shares of Common Stock and/or Special Voting Stock will be voted in accordance with the Board of Directors’ recommendations. If other matters properly come before the Annual Meeting, the persons appointed to vote the proxies will vote on these matters in accordance with their discretion. The Board of Directors has selected Brian Thrasher and Steven Millsap to act as proxies for our stockholders with full power of substitution and resubstitution at the Annual Meeting. Either of them is authorized to vote all proxies to vote shares of Common Stock and/or Special Voting Stock at the Annual Meeting that are granted by stockholders of record of the Company as of the Record Date. The enclosed proxy card with respect to the Annual Meeting is solicited by the Board of Directors.