Charles G. Pardee - Oct 28, 2025 Form 3 Insider Report for Terrestrial Energy Inc. /DE/ (IMSR)

Role
Director
Signature
/s/ Steven M. Millsap, pursuant to Power of Attorney
Stock symbol
IMSR
Transactions as of
Oct 28, 2025
Transactions value $
$0
Form type
3
Date filed
11/7/2025, 06:47 PM
Previous filing
Sep 30, 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Pardee Charles G Director 2730 W. TYVOLA ROAD, SUITE 100, CHARLOTTE /s/ Steven M. Millsap, pursuant to Power of Attorney 2025-11-07 0001544340

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
holding IMSR Common Stock, par value $0.0001 per share ("Common Stock") 6.76K Oct 28, 2025 Direct F1

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) Oct 28, 2025 Common Stock 179K $2.01 Direct F2
holding IMSR Stock Option (Right to Buy) Oct 28, 2025 Common Stock 67.1K $2.24 Direct F3
holding IMSR Stock Option (Right to Buy) Oct 28, 2025 Common Stock 134K $2.24 Direct F3
holding IMSR Warrants (Right to Buy) Oct 28, 2025 Common Stock 22.4K $2.24 Direct F4
holding IMSR Contingent Value Right Oct 28, 2025 Common Stock Direct F5
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Upon closing of the business combination (the "Business Combination") between Terrestrial Energy Inc., a Delaware corporation formerly known as HCM II Acquisition Corp. ("New Terrestrial"), and Terrestrial Energy Development Inc., a Delaware corporation formerly known as Terrestrial Energy Inc. ("Legacy Terrestrial"), the reporting person acquired these securities in exchange for the reporting person's securities in Legacy Terrestrial pursuant to the terms and conditions of the Business Combination Agreement, dated as of March 26, 2025, by and among HCM II Acquisition Corp., HCM II Merger Sub Inc. and Legacy Terrestrial.
F2 Consists of options granted pursuant to the Legacy Terrestrial Second Amended and Restated 2024 Stock Option Plan. The options vest on certain specified milestone conditions.
F3 Consists of options granted pursuant to the Legacy Terrestrial 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 Legacy Terrestrial warrants to purchase common stock that are currently exercisable.
F5 Consists of contingent value right issued upon conversion of Legacy Terrestrial convertible notes in connection with the Business Combination. Each contingent value right entitles the holder to receive additional shares of Common Stock in the event that the volume weighed average price of the Common Stock for the twenty (20) trading days beginning on the trading day immediately following expiration of the lock-up period contemplated by the applicable Legacy Terrestrial convertible note is less than seventy-five percent (75%) of the redemption price ($7.905).

Remarks:

Exhibit List - Exhibit 24.1 - Power of Attorney