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Terrestrial Energy (IMSR) COO receives 32,787 stock options under 2025 equity plan

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

Terrestrial Energy Inc. Chief Operating Officer William F. Smith received a grant of stock options covering 32,787 shares of Common Stock. These options were awarded at an exercise price of $6.34 per share and expire on April 12, 2036.

The options were granted under the Terrestrial Energy Inc. 2025 Equity Incentive Plan and vest in three equal annual installments on each of the first, second and third anniversaries of the grant date, contingent on his continued service. Following this grant, he holds 32,787 stock options directly.

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Insider Smith William F.
Role Chief Operating Officer
Type Security Shares Price Value
Grant/Award Stock Option (Right to Buy) 32,787 $0.00 --
Holdings After Transaction: Stock Option (Right to Buy) — 32,787 shares (Direct)
Footnotes (1)
  1. [object Object]
Options granted 32,787 options Stock Option (Right to Buy) grant to COO
Exercise price $6.34 per share Exercise price for granted stock options
Underlying shares 32,787 shares Common Stock underlying the options
Post-grant option holdings 32,787 options Total options held following this transaction
Option expiration April 12, 2036 Expiration date of granted options
Stock Option (Right to Buy) financial
"security_title: "Stock Option (Right to Buy)""
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.
expiration date financial
"expiration_date: "2036-04-12T00:00:00.000Z""
The expiration date is the deadline after which a financial contract, such as an option or a futures agreement, is no longer valid or can be exercised. It matters to investors because it determines the timeframe during which they can take action or benefit from the contract, similar to how a coupon or a food item has a limited period of usefulness. Once the expiration date passes, the contract loses its value or ability to be used.
underlying security financial
"underlying_security_title: "Common Stock""
SEC Form 4
FORM 4UNITED 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*
Smith William F.

(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)
Director10% Owner
XOfficer (give title below)Other (specify below)
Chief Operating 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)
XForm 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)
CodeVAmount(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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Stock Option (Right to Buy)$6.3404/12/2026A32,78704/12/2027(1)04/12/2036Common Stock32,787$032,787D
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 Attorney04/14/2026
** Signature of Reporting PersonDate
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 did Terrestrial Energy (IMSR) disclose about William F. Smith in this Form 4?

The filing shows Chief Operating Officer William F. Smith received a grant of stock options for 32,787 shares. These options are compensation, not an open-market purchase, and give him the right to buy Common Stock at a fixed exercise price.

How many Terrestrial Energy (IMSR) stock options were granted to the COO?

William F. Smith was granted stock options covering 32,787 shares of Terrestrial Energy Common Stock. This award increases his potential equity exposure through the company’s 2025 Equity Incentive Plan, aligning part of his compensation with future share performance.

What is the exercise price of the Terrestrial Energy (IMSR) options granted to the COO?

The granted stock options have an exercise price of $6.34 per share. This means Smith can choose to buy Terrestrial Energy Common Stock at $6.34 in the future, regardless of the market price, subject to vesting and expiration terms.

When do William F. Smith’s Terrestrial Energy (IMSR) options vest?

The options vest in one-third increments on each of the first, second and third anniversaries of the grant date. Vesting is conditioned on Smith’s continued service with Terrestrial Energy through each applicable vesting date, typical for long-term incentive awards.

When do the newly granted Terrestrial Energy (IMSR) options expire?

The stock options granted to William F. Smith expire on April 12, 2036. After that expiration date, any unexercised options will lapse, meaning he would lose the right to buy shares at the $6.34 exercise price.

Are the Terrestrial Energy (IMSR) options granted to the COO part of an equity plan?

Yes. The options were granted under the Terrestrial Energy Inc. 2025 Equity Incentive Plan. Such plans are designed to provide equity-based compensation, linking executive rewards to the company’s long-term share performance and retention objectives.