IMSR · Amended Quarterly Report (Form 10-Q/A) · Filed November 21, 2025

Terrestrial Energy Inc — 10-Q/A exhibit

tm2531886d1_ex31-2.htm

Terrestrial Energy Inc on Boardroom Alpha

Exhibit 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO RULE 13A-14(A) UNDER THE SECURITIES EXCHANGE ACT OF 1934,

AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Brian Thrasher, certify that:

I have reviewed this Amendment No. 1 to the Quarterly Report on Form 10-Q/A of Terrestrial Energy Inc. f/k/a HCM II Acquisition Corp.;

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

Date: November 20, 2025

	/s/ Brian Thrasher
	Brian Thrasher
	Chief Financial Officer
	(Principal Financial and Accounting Officer)

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