CTO at Terrestrial Energy (IMSR) receives 32,787 stock options award

Rhea-AI Filing Summary

Terrestrial Energy Inc. Chief Technology Officer David Michael LeBlanc received a grant of 32,787 stock options, each with an exercise price of $6.34 per share, giving him the right to buy common stock at that price.

The options were granted under the Terrestrial Energy Inc. 2025 Equity Incentive Plan and vest in one-third increments on each of the first, second and third anniversaries of the grant date, subject to his continued service. After this filing, he reports 5,981 common shares held directly and 13,731 common shares held indirectly through an entity.

Insider Trade Summary

3 transactions reported

Mixed 3 txns

Insider LeBlanc David Michael

Role Chief Technology Officer

Type	Security	Shares	Price	Value
Grant/Award	Stock Option (Right to Buy)	32,787	$0.00	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Stock Option (Right to Buy) — 32,787 shares (Direct); Common Stock — 5,981 shares (Direct); Common Stock — 13,731 shares (Indirect, Through Entity)

Footnotes (1)

1. [object Object]

Key Figures

Stock options granted: 32,787 options Option exercise price: $6.34 per share Option expiration date: April 12, 2036 +3 more

6 metrics

Stock options granted 32,787 options Grant to CTO David Michael LeBlanc on April 12, 2026

Option exercise price $6.34 per share Exercise price for 32,787 stock options

Option expiration date April 12, 2036 Expiration for 32,787 stock options

Direct common shares 5,981 shares Common stock held directly after transactions

Indirect common shares 13,731 shares Common stock held indirectly through an entity

Underlying shares for options 32,787 shares Common stock underlying granted stock options

Key Terms

Stock Option (Right to Buy), 2025 Equity Incentive Plan, vest in one-third increments, indirect ownership

4 terms

Stock Option (Right to Buy) financial

"security_title: "Stock Option (Right to Buy)""

2025 Equity Incentive Plan financial

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

vest in one-third increments financial

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

indirect ownership financial

"Common Stock ... total_shares_following_transaction: "13731.0000" ... direct_or_indirect: "I""

Form 4 Insider Transactions: What Each Field Means →

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^*

LeBlanc David Michael

(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
X	Officer (give title below)		Other (specify below)
	Chief Technology Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/12/2026

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
Common Stock								5,981	D
Common Stock								13,731	I	Through Entity

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)	$6.34	04/12/2026		A		32,787		04/12/2027(1)	04/12/2036	Common Stock	32,787	$0	32,787	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/ Steven M. Millsap, pursuant to Power of Attorney	04/14/2026
	** 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)

FAQ

What insider transaction did Terrestrial Energy (IMSR) report for David LeBlanc?

Terrestrial Energy reported a grant of 32,787 stock options to CTO David Michael LeBlanc. The options give him the right to buy common shares at a fixed exercise price of $6.34 under the company’s 2025 Equity Incentive Plan.

What are the key terms of David LeBlanc’s 32,787 Terrestrial Energy stock options?

The 32,787 stock options have an exercise price of $6.34 per share and expire on April 12, 2036. They were granted under the 2025 Equity Incentive Plan and relate to an equal number of Terrestrial Energy common shares.

How do David LeBlanc’s Terrestrial Energy options vest over time?

The options vest in one-third increments on each of the first, second and third anniversaries of the April 12, 2026 grant date. Vesting is conditional on David LeBlanc’s continued service with Terrestrial Energy through each applicable vesting date.

How many Terrestrial Energy common shares does David LeBlanc hold directly and indirectly?

Following this filing, David LeBlanc reports 5,981 Terrestrial Energy common shares held directly. He also reports 13,731 common shares held indirectly through an entity, reflecting both personal and entity-related ownership positions in the company.

Is David LeBlanc’s Form 4 transaction a market purchase or sale of Terrestrial Energy stock?

The Form 4 shows a grant or award of 32,787 stock options, not an open-market purchase or sale. The transaction is compensation-related, providing rights to buy shares later rather than an immediate trade in Terrestrial Energy’s common stock.

Under which plan were the new Terrestrial Energy options granted to David LeBlanc?

The options were granted pursuant to the Terrestrial Energy Inc. 2025 Equity Incentive Plan. This plan provides equity-based awards, and LeBlanc’s options vest over three years, subject to his continued service with the company through each vesting date.