Shawn Matthews - 18 Dec 2025 Form 4 Insider Report for Terrestrial Energy Inc. /DE/ (IMSR)

Role
Director
Signature
/s/ Steven M. Millsap, Attorney-in-Fact
Issuer symbol
IMSR
Transactions as of
18 Dec 2025
Net transactions value
$0
Form type
4
Filing time
22 Dec 2025, 16:30:08 UTC
Previous filing
13 Nov 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Matthews Shawn Director 2730 W. TYVOLA ROAD, SUITE 100, CHARLOTTE /s/ Steven M. Millsap, Attorney-in-Fact 22 Dec 2025 0001855118

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 +4,190 $0.000000 4,190 18 Dec 2025 Common Stock 4,190 Direct F1
transaction IMSR Restricted Stock Units Award $0 +735 +18% $0.000000 4,925 18 Dec 2025 Common Stock 735 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.