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    Director Matthews Shawn disposed of 2,920,000 shares (SEC Form 4)

    11/13/25 7:31:34 PM ET
    $HOND
    Get the next $HOND alert in real time by email
    SEC FORM 4 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*
    Matthews Shawn

    (Last) (First) (Middle)
    C/O HCM INVESTOR HOLDINGS II, LLC
    100 FIRST STAMFORD PLACE, SUITE 330

    (Street)
    STAMFORD CT 06902

    (City) (State) (Zip)
    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
    Officer (give title below) Other (specify below)
    3. Date of Earliest Transaction (Month/Day/Year)
    11/06/2025
    4. If Amendment, Date of Original Filed (Month/Day/Year)
    6. Individual or Joint/Group Filing (Check Applicable Line)
    Form filed by One Reporting Person
    X Form filed by More than One Reporting Person
    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, par value $0.0001 per share 11/06/2025 J 2,920,000 D (1) 2,755,000 I See Footnote(2)
    Common Stock, par value $0.0001 per share 533,514 D
    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
    Warrants $11.5 11/06/2025 J 3,500,000 11/27/2025 10/28/2030 Common Stock, par value $0.0001 per share 3,500,000 (1) 775,000 I See Footnote(2)
    Warrants $11.5 11/27/2025 10/28/2030 Common Stock, par value $0.0001 per share 1,267,599 1,267,599 I See Footnote(3)
    1. Name and Address of Reporting Person*
    Matthews Shawn

    (Last) (First) (Middle)
    C/O HCM INVESTOR HOLDINGS II, LLC
    100 FIRST STAMFORD PLACE, SUITE 330

    (Street)
    STAMFORD CT 06902

    (City) (State) (Zip)

    Relationship of Reporting Person(s) to Issuer
    X Director 10% Owner
    Officer (give title below) Other (specify below)
    1. Name and Address of Reporting Person*
    HCM Investor Holdings II, LLC

    (Last) (First) (Middle)
    C/O HCM INVESTOR HOLDINGS II, LLC
    100 FIRST STAMFORD PLACE, SUITE 330

    (Street)
    STAMFORD CT 06902

    (City) (State) (Zip)

    Relationship of Reporting Person(s) to Issuer
    Director 10% Owner
    Officer (give title below) X Other (specify below)
    Former 10% Holder
    Explanation of Responses:
    1. On November 6, 2025, HCM Investor Holdings II, LLC (the "Sponsor") distributed an aggregate of 5,675,000 shares of common stock, par value $0.0001 per share of the Issuer ("Common Stock") and 4,275,000 Warrants, convertible to 4,275,000 shares of Common Stock, to its members as a distribution for no consideration in accordance with the terms of the Sponsor's limited liability company agreement. 2,755,000 shares of Common Stock and 775,000 Warrants were distributed to Shawn Matthews on such basis. Under Rule 16a-13 promulgated under the Securities Exchange Act of 1934, as a change in form of beneficial ownership, the reported distribution by the Sponsor (as it relates to Mr. Matthews' deemed beneficial ownership of the securities held by the Sponsor) to its members from the Sponsor, were exempt from Section 16 of the Securities Exchange Act of 1934.
    2. Shawn Matthews is the record holder of such securities. Shawn Matthews is the sole Managing Member of HCM Investor Holdings II, LLC and shares voting and investment discretion with respect to the securities held by HCM Investor Holdings II, LLC.
    3. Mr. Matthews is the sole managing member of Hondo Holdings LLC, which is registered owner of these warrants, and Mr. Matthews holds voting and investment power with respect to warrants held of record by Hondo Holdings LLC.
    /s/ Shawn Matthews, by Steven Bishcoff, Attorney-in-Fact 11/13/2025
    /s/ HCM Investor Holdings II, LLC, by Steven Bischoff, Attorney-in-Fact 11/13/2025
    ** 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.
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