William D. Johnson - 18 Dec 2025 Form 4/A - Amendment Insider Report for Terrestrial Energy Inc. /DE/ (HOND)

Role: Director
Signature: /s/ Steven M. Millsap, Attorney-in-Fact
Issuer symbol: HOND
Transactions as of: 18 Dec 2025
Net transactions value: $0
Form type: 4/A - Amendment
Filing time: 09 Jan 2026, 16:29:35 UTC
Date Of Original Report: 22 Dec 2025
Previous filing: 07 Nov 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
JOHNSON WILLIAM D	Director	2730 W. TYVOLA ROAD, SUITE 100, CHARLOTTE	/s/ Steven M. Millsap, Attorney-in-Fact	09 Jan 2026	0001183048

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	IMSR	Restricted Stock Units	Award	$0	+1,029	+18%	$0.000000	6,894	18 Dec 2025	Common Stock	1,029		Direct	F1, F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	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.
F2	On December 22, 2025, the Reporting Person filed a Form 4 in which there was an inadvertent error in the number of reported restricted stock units.