Terrestrial Energy Starts Trading On Nasdaq Under New IMSR Ticker Follow Business Combination With HCM II Acquisition

Terrestrial Energy Inc. (Nasdaq: IMSR) ("Terrestrial Energy" or the "Company"), a developer of small modular nuclear plants using advanced reactor technology, announced that it will begin trading on the Nasdaq Stock Market LLC ("Nasdaq") under the new ticker symbol "IMSR" at market open today, following the completion of its business combination with HCM II Acquisition Corp. ("HCM II") (the "transaction") on October 28, 2025.

As a result of the business combination, Terrestrial Energy has received in excess of $292 million in gross proceeds before expenses, including $50 million from a common stock PIPE from new non-affiliated fundamental institutional investors, and approximately $242 million of cash from HCM II's trust account before expenses, reflecting redemptions of less than 1% of HCM II shares.