Simon Irish - 28 Oct 2025 Form 4 Insider Report for Terrestrial Energy Inc. /DE/ (HOND)

Role: Chief Executive Officer, Director
Signature: /s/ Steven M. Millsap, pursuant to Power of Attorney
Issuer symbol: HOND
Transactions as of: 28 Oct 2025
Net transactions value: $0
Form type: 4
Filing time: 30 Oct 2025, 19:56:21 UTC
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Irish Simon	Chief Executive Officer, Director	2730 W. TYVOLA ROAD, SUITE 100, CHARLOTTE	/s/ Steven M. Millsap, pursuant to Power of Attorney	30 Oct 2025	0002091865

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	+166,298		$0.000000	166,298	28 Oct 2025	Common Stock	166,298		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. The restricted stock units vest pro rata over a three year period following the grant date.

Remarks:

Exhibit List - Exhibit 24.1 - Power of Attorney