Frederick W. Buckman - 18 Dec 2025 Form 4 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
Filing time: 22 Dec 2025, 17:25:19 UTC
Previous filing: 07 Nov 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
BUCKMAN FREDERICK W	Director	2730 W. TYVOLA ROAD, SUITE 100, CHARLOTTE	/s/ Steven M. Millsap, Attorney-in-Fact	22 Dec 2025	0001144845

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	+6,703		$0.000000	6,703	18 Dec 2025	Common Stock	6,703		Direct	F1
transaction	IMSR	Resricted Stock Units	Award	$0	+1,176	+18%	$0.000000	7,879	18 Dec 2025	Common Stock	1,176		Direct	F1

* 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.