Terrestrial Energy grants 299,401 options to EVP

Terrestrial Energy Inc. reported that EVP, Engineering Pamela Beth Cowan received a grant of 299,401 stock options under the Terrestrial Energy Inc. 2025 Equity Incentive Plan.

Rhea-AI Filing Summary

Terrestrial Energy Inc. reported that EVP, Engineering Pamela Beth Cowan received a grant of 299,401 stock options under the Terrestrial Energy Inc. 2025 Equity Incentive Plan. The options have an exercise price of $5.0100 per share, become exercisable starting 2027-07-29, expire on 2036-07-29, and vest in one-third increments on each of the first, second and third anniversaries of the grant date, subject to her continued service. Following the grant, she held 299,401 derivative securities.

Insider Trade Summary

Grant/Award: 299,401 shares

Grant/Award 1 txn

Insider Cowan Pamela Beth

Role EVP, Engineering

Type	Security	Shares	Price	Value
Grant/Award	Stock Option (Right to Buy) F1	299,401	$0.00	$0.00

Holdings After Transaction: Stock Option (Right to Buy) — 299,401 contracts (Direct)

Footnotes (1)

1. F1. Consists of options granted pursuant to the Terrestrial Energy Inc. 2025 Equity Incentive Plan. The options vest in one-third increments on each of the first, second and third anniversaries of the grant date, subject to the reporting person's continued service through each applicable vesting date.

Key Figures

Stock options granted: 299,401 shares Exercise price: $5.0100 per share Exercise date: 2027-07-29 +1 more

4 metrics

Stock options granted 299,401 shares Grant of stock options to EVP, Engineering Pamela Beth Cowan

Exercise price $5.0100 per share Exercise price of the granted stock options

Exercise date 2027-07-29 Date from which the options become exercisable

Expiration date 2036-07-29 Expiration date of the granted stock options

Key Terms

Stock Option (Right to Buy), Equity Incentive Plan, vesting

3 terms

Stock Option (Right to Buy) financial

"security title listed as Stock Option (Right to Buy) for the derivative grant"

Equity Incentive Plan financial

"options 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 options vest in one-third increments on each of the first, second and third anniversaries"

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 transaction did Terrestrial Energy (IMSR) report for Pamela Beth Cowan?

Terrestrial Energy reported that EVP, Engineering Pamela Beth Cowan received a grant of 299,401 stock options. These are derivative securities giving her the right to buy common stock at a fixed exercise price.

How many stock options were granted to the Terrestrial Energy (IMSR) EVP Engineering and at what exercise price?

Pamela Beth Cowan was granted 299,401 stock options with an exercise price of $5.0100 per share. Each option relates to one share of Terrestrial Energy common stock.

When do the newly granted Terrestrial Energy (IMSR) options vest and become exercisable?

The options vest in one-third increments on each of the first, second and third anniversaries of the grant date. They become exercisable starting 2027-07-29, subject to her continued service through each vesting date.

What is the expiration date of the Terrestrial Energy (IMSR) options granted to Pamela Beth Cowan?

The granted stock options expire on 2036-07-29. After this expiration date, any unexercised options will no longer be exercisable for Terrestrial Energy common stock.

How many Terrestrial Energy (IMSR) derivative securities does Pamela Beth Cowan hold after this transaction?

Following the reported grant, Pamela Beth Cowan beneficially held 299,401 derivative securities in the form of stock options. This position reflects the total after the transaction.

Was the Terrestrial Energy (IMSR) option grant to Pamela Beth Cowan made under a Rule 10b5-1 trading plan?

The filing shows the Rule 10b5-1 checkbox as not selected, and the footnote describes only the equity incentive plan and vesting terms. It does not indicate a Rule 10b5-1 trading plan.

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

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Available on EDGAR 07/31/2026 - 05:00 PM Accepted by SEC EDGAR 07/31/2026 - 05:00 PM Learn about SEC filing dates

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^*

Cowan Pamela Beth

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/29/2026

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
Stock Option (Right to Buy)	$5.01	07/29/2026		A		299,401		07/29/2027(1)	07/29/2036	Common Stock	299,401	$0	299,401	D

Explanation of Responses:

1. Consists of options granted pursuant to the Terrestrial Energy Inc. 2025 Equity Incentive Plan. The options vest in one-third increments on each of the first, second and third anniversaries of the grant date, subject to the reporting person's continued service through each applicable vesting date.

	/s/ Brian Thrasher, Attorney-in-Fact	07/31/2026
	** 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)