William F. Smith - 28 Oct 2025 Form 3 Insider Report for Terrestrial Energy Inc. /DE/ (HOND)

Role
Chief Operating Officer
Signature
/s/ Steven M. Millsap, pursuant to Power of Attorney
Issuer symbol
HOND
Transactions as of
28 Oct 2025
Net transactions value
$0
Form type
3
Filing time
07 Nov 2025, 18:34:23 UTC
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Smith William F. Chief Operating Officer 2730 W. TYVOLA ROAD, SUITE 100, CHARLOTTE /s/ Steven M. Millsap, pursuant to Power of Attorney 07 Nov 2025 0002092633

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
holding IMSR Stock Option (Right to Buy) 28 Oct 2025 Common Stock 223,515 $1.12 Direct F1, F5
holding IMSR Stock Option (Right to Buy) 28 Oct 2025 Common Stock 335,272 $1.48 Direct F1, F5
holding IMSR Stock Option (Right to Buy) 28 Oct 2025 Common Stock 8,941 $2.01 Direct F1
holding IMSR Stock Option (Right to Buy) 28 Oct 2025 Common Stock 447,030 $2.01 Direct F2
holding IMSR Stock Option (Right to Buy) 28 Oct 2025 Common Stock 111,758 $2.01 Direct F1
holding IMSR Stock Option (Right to Buy) 28 Oct 2025 Common Stock 223,515 $2.24 Direct F1
holding IMSR Stock Option (Right to Buy) 28 Oct 2025 Common Stock 89,406 $2.24 Direct F1
holding IMSR Stock Option (Right to Buy) 28 Oct 2025 Common Stock 156,461 $2.24 Direct F3
holding IMSR Stock Option (Right to Buy) 28 Oct 2025 Common Stock 134,109 $7.83 Direct F4
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Consists of options granted pursuant to the Terrestrial Energy Inc. Second Amended and Restated 2024 Stock Option Plan. The options are currently exercisable.
F2 Consists of options granted pursuant to the Terrestrial Energy Inc. Second Amended and Restated 2024 Stock Option Plan. The options vest based on certain specified milestone conditions.
F3 Consists of options granted pursuant to the Terrestrial Energy Inc. Second Amended and Restated 2024 Stock Option 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.
F4 Consists of options granted pursuant to the Terrestrial Energy Inc. Second Amended and Restated 2024 Stock Option Plan. The options vest in one-half increments on June 20, 2027 and June 30, 2028.
F5 Price is expressed in Canadian dollars.

Remarks:

Exhibit List - Exhibit 24.1 - Power of Attorney