(IMSR)

Reporting relationship: Director
Issuer ticker: IMSR
Reported as of: 23 Jul 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 27 Jul 2026, 17:00:03 UTC
Source filing: View source filing
Reporting owner signature: /s/ Brian Thrasher, Attorney-in-Fact

Key filing fact

Kathryn Ann McCarthy filed Form 4 for Terrestrial Energy Inc. /DE/ (IMSR) on 27 Jul 2026.

Key facts

This page summarizes Kathryn Ann McCarthy's Form 4 filing for Terrestrial Energy Inc. /DE/ (IMSR).
1 reported transaction and 1 derivative row are listed below.
Accepted by SEC: 27 Jul 2026, 17:00.

Change

No earlier filing in this sequence is available for direct comparison.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002146932 Primary reporting owner

McCarthy Kathryn Ann

Relationship: Director
Address: C/O TERRESTRIAL ENERGY INC, 2730 W. TYVOLA ROAD, SUITE 100, CHARLOTTE
Signature: /s/ Brian Thrasher, Attorney-in-Fact
Signature date: 27 Jul 2026

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

IMSR transaction Derivative

Restricted Stock Units

Award

Transaction value
Shares: +2,049
Change %
Price: $0.000000^*
Shares after: 2,049
Date: 23 Jul 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 2,049
Exercise price
Footnotes: F1, F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

Each restricted stock unit represents a contingent right to acquire one share of Common Stock.

Footnote F2

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.