{"transactions":[{"id":703049,"issuer":{"id":5288,"kind":"organization","name":"Terrestrial Energy Inc. /DE/","symbol":"IMSR"},"owners":[{"id":28585,"kind":"person","name":"McCarthy Kathryn Ann","position":1,"cik":"0002146932","reported_name":"McCarthy Kathryn Ann","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Restricted Stock Units","published_at":"2026-07-27T21:00:03.000Z","date":"2026-07-23","kind":"grant","planned":false,"acquired":true,"shares":2049,"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."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Consists of restricted stock units granted pursuant to the Terrestrial Energy Inc. 2025 Equity Incentive Plan. The restricted stock units vest in full on December 31, 2026, subject to the reporting person's continued service through the vesting date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Consists of restricted stock units granted pursuant to the Terrestrial Energy Inc. 2025 Equity Incentive Plan. The restricted stock units vest in full on December 31, 2026, subject to the reporting person's continued service through the vesting date."}],"balance_after":2049,"derivative":{"underlying":"Common Stock","underlying_shares":2049},"source":{"system":"sec-edgar","filing":"0001193125-26-318233","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2019804/000119312526318233/ownership.xml","form_type":"4"}}]}