IMSR ▲ +3.1% - Terrestrial Energy Inc. $IMSR Ameresco and Terrestrial Energy to Deliver IMSR Advanced Nuclear Power to U.S. Army’s Aberdeen Proving Ground Terrestrial Energy's stock rose 3.1% today following news that the company and Ameresco will deliver an integrated molten salt reactor to the U.S. Army's Aberdeen Proving Ground, a significant commercial validation for the company's IMSR technology in the domestic defense and infrastructure sectors. 21-SEP-2026 08:05 AM ET