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Terrestrial Energy Inc. /DE/

For the period ended Dec 31, 2025. Filed Mar 30, 2026.

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A company's yearly report to the SEC, with audited financial statements. It is the fullest account a company gives of its business, its finances and the risks it sees.

FY2025 · Filed Mar 30, 2026

IMSR$3.00+5.6%Stored close · as of Nov 9, 2026

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Contents

Item 9B. Other Information

Rule 10b5-1 Trading Plans

During the fourth quarter of 2025, none of the Company’s directors or executive officers adopted, modified orterminated any “Rule 10b5-1 trading arrangement” or any “non-Rule 10b5-1 trading arrangement,” as each term is defined in Item 408 of Regulation S-K.

Delaware Certificate of Correction

On March 27, 2026, the Company filed a Certificate of Correction (the “Certificate of Correction”) with the Secretary of State of the State of Delaware in connection with the Company’s Certificate of Incorporation filed on October 23, 2025 (the “Charter”). The Certificate of Correction was filed to update Article II of the Charter to reflect the correct name and address of the Company’s registered agent. Other than disclosed herein, no additional changes have been made to the Charter. The as-corrected text of the Charter is included as Exhibit 3.1 to this Annual Report.

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The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.