Terrestrial Energy Inc. /DE/

Under the program, the Company may repurchase shares of its common stock from time to time through open market purchases, privately negotiated transactions, block trades or other means, including under a trading plan adopted in accordance with Rule 10b5-1 under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), and in accordance with Rule 10b-18 under the Exchange Act and other applicable laws, rules and regulations. The timing, manner, price and amount of any repurchases will be determined by management at its discretion based on general economic and market conditions, the Company's share price, capital requirements, applicable legal requirements and other factors.

The program will be funded from the Company's existing cash on hand. It does not obligate the Company to repurchase any particular amount of common stock, may be modified, suspended or discontinued at any time at the Company's discretion without prior notice, and will expire on October 22, 2027. As of October 23, 2026, the Company had approximately 105.9 million shares of common stock outstanding, including shares of common stock issuable upon exchange of outstanding exchangeable shares.