Terrestrial Energy grants 2049 RSUs to director

Terrestrial Energy Inc. director Kathryn Ann McCarthy received a grant of 2049 Restricted Stock Units on 2026-07-23 under the Terrestrial Energy Inc. 2025 Equity Incentive Plan.

Accepted by SEC EDGAR 07/27/2026 - 05:00 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Terrestrial Energy Inc. director Kathryn Ann McCarthy received a grant of 2049 Restricted Stock Units on 2026-07-23 under the Terrestrial Energy Inc. 2025 Equity Incentive Plan. Each unit represents a contingent right to acquire one share of Common Stock and vests in full on December 31, 2026, subject to her continued service. Following this award, she directly holds 2049 restricted stock units.

Insider Trade Summary

Grant/Award: 2,049 shares

Grant/Award 1 txn

Insider McCarthy Kathryn Ann

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Units F1, F2	2,049	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units — 2,049 contracts (Direct)

Footnotes (2)

1. F1. Each restricted stock unit represents a contingent right to acquire one share of Common Stock.
2. 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.

Key Figures

Restricted stock units granted: 2049 units Underlying common shares per RSU: 1 share Vesting date: December 31, 2026 +1 more

4 metrics

Restricted stock units granted 2049 units Grant to director Kathryn Ann McCarthy on 2026-07-23

Underlying common shares per RSU 1 share Each RSU represents a contingent right to one share of Common Stock

Vesting date December 31, 2026 RSUs vest in full on this date, subject to continued service

RSUs held after grant 2049 units Total restricted stock units directly owned following the reported award

Key Terms

Restricted Stock Units, Equity Incentive Plan, vesting

3 terms

Restricted Stock Units financial

"Each restricted stock unit represents a contingent right to acquire one share"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

Equity Incentive Plan financial

"granted pursuant to the Terrestrial Energy Inc. 2025 Equity Incentive Plan"

An equity incentive plan is a program that gives employees, executives or directors the right to receive company stock or options to buy stock as part of their pay. Think of it as offering slices of future company profit to motivate people to boost long‑term performance; for investors it matters because it can align employee goals with shareholder value but also increases the number of shares outstanding, which can dilute existing ownership.

vesting financial

"The restricted stock units vest in full on December 31, 2026"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider equity award did Terrestrial Energy (IMSR) report for Kathryn Ann McCarthy?

Terrestrial Energy reported that director Kathryn Ann McCarthy received 2049 Restricted Stock Units. The units were granted on 2026-07-23 under the company’s 2025 Equity Incentive Plan as part of her equity compensation.

How many Terrestrial Energy (IMSR) shares can the new RSUs for Kathryn Ann McCarthy convert into?

Each of McCarthy’s 2049 Restricted Stock Units represents a contingent right to acquire one share of Common Stock. If fully vested and settled, the award could deliver 2049 shares of Terrestrial Energy common stock.

When do Kathryn Ann McCarthy’s new Terrestrial Energy (IMSR) RSUs vest?

The new RSUs vest in full on December 31, 2026. Vesting is conditioned on McCarthy’s continued service with Terrestrial Energy through that vesting date, as specified in the grant terms.

Under which plan were the Terrestrial Energy (IMSR) RSUs for Kathryn Ann McCarthy granted?

The 2049 Restricted Stock Units were granted under the Terrestrial Energy Inc. 2025 Equity Incentive Plan. This plan governs the terms of equity awards, including McCarthy’s RSU grant and its vesting conditions.

What is Kathryn Ann McCarthy’s Terrestrial Energy (IMSR) RSU holding after this reported grant?

After the reported transaction, McCarthy directly holds 2049 Restricted Stock Units. This total reflects the full amount of the new award disclosed, with no other RSU changes reported in this filing.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

McCarthy Kathryn Ann

(Last) (First) (Middle)

C/O TERRESTRIAL ENERGY INC

2730 W. TYVOLA ROAD, SUITE 100

(Street)

CHARLOTTE NORTH CAROLINA 28217

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Terrestrial Energy Inc. /DE/ [ IMSR ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/23/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Units	(1)	07/23/2026		A		2,049		(2)	(2)	Common Stock	2,049	$0	2,049	D

Explanation of Responses:

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

2. 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.

	/s/ Brian Thrasher, Attorney-in-Fact	07/27/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)