{"transactions":[{"id":961216,"issuer":{"id":5288,"kind":"organization","name":"Terrestrial Energy Inc. /DE/","symbol":"IMSR"},"owners":[{"id":71000,"kind":"person","name":"Hill David John","position":1,"cik":"0002091721","reported_name":"Hill David John","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Resricted Stock Units","published_at":"2025-12-22T21:49:29.000Z","date":"2025-12-18","kind":"grant","planned":false,"acquired":true,"shares":588,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each restricted stock unit represents a contingent right to acquire one share of Common Stock. So long as the Reporting Person provides continuous service to Terrestrial Energy, Inc., 100% of the restricted stock units will vest on December 31, 2026."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each restricted stock unit represents a contingent right to acquire one share of Common Stock. So long as the Reporting Person provides continuous service to Terrestrial Energy, Inc., 100% of the restricted stock units will vest on December 31, 2026."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each restricted stock unit represents a contingent right to acquire one share of Common Stock. So long as the Reporting Person provides continuous service to Terrestrial Energy, Inc., 100% of the restricted stock units will vest on December 31, 2026."}],"balance_after":3940,"derivative":{"underlying":"Common Stock","underlying_shares":588},"source":{"system":"sec-edgar","filing":"0000950138-25-000039","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2019804/000095013825000039/form4.xml","form_type":"4"}},{"id":961215,"issuer":{"id":5288,"kind":"organization","name":"Terrestrial Energy Inc. /DE/","symbol":"IMSR"},"owners":[{"id":71000,"kind":"person","name":"Hill David John","position":1,"cik":"0002091721","reported_name":"Hill David John","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Restricted Stock Units","published_at":"2025-12-22T21:49:29.000Z","date":"2025-12-18","kind":"grant","planned":false,"acquired":true,"shares":3352,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each restricted stock unit represents a contingent right to acquire one share of Common Stock. So long as the Reporting Person provides continuous service to Terrestrial Energy, Inc., 100% of the restricted stock units will vest on December 31, 2026."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each restricted stock unit represents a contingent right to acquire one share of Common Stock. So long as the Reporting Person provides continuous service to Terrestrial Energy, Inc., 100% of the restricted stock units will vest on December 31, 2026."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each restricted stock unit represents a contingent right to acquire one share of Common Stock. So long as the Reporting Person provides continuous service to Terrestrial Energy, Inc., 100% of the restricted stock units will vest on December 31, 2026."}],"balance_after":3352,"derivative":{"underlying":"Common Stock","underlying_shares":3352},"source":{"system":"sec-edgar","filing":"0000950138-25-000039","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2019804/000095013825000039/form4.xml","form_type":"4"}}]}