| Item 1. | |
| (a) | Name of issuer:
Terrestrial Energy Inc. |
| (b) | Address of issuer's principal executive offices:
2730 W. Tyvola Road, Suite 100, Charlotte, NC 28217 |
| Item 2. | |
| (a) | Name of person filing:
This statement is filed on behalf of the following persons (collectively, the "Reporting Persons"):
(i) Roberto Sella, an individual;
(ii) Roberto M. Sella 2012 Family Trust, (the "Trust"); and
(iii) LL Charitable Foundation (the "Foundation").
This Statement relates to Common Stock, par value $0.0001 per share (the "Shares") of the Issuer held by Roberto Sella, the Trust, and the Foundation. Mr. Sella is a principal owner and controlling person of the Trust and the Foundation, and in such capacity, may be deemed to beneficially own the Shares held by the Trust and the Foundation, respectively. |
| (b) | Address or principal business office or, if none, residence:
2400 Market Street, Suite 302
Philadelphia, PA, 19103 |
| (c) | Citizenship:
(i) Roberto Sella, is a United States citizen;
(ii) the Trust is organized under the laws of Pennsylvania; and
(iii) the Foundation is organized under the laws of Pennsylvania. |
| (d) | Title of class of securities:
Common Stock, par value $0.0001 per share |
| (e) | CUSIP No.:
881454102 |
| Item 3. | If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a: |
| (a) |  Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
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| (b) | Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
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| (c) | Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
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| (d) | Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
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| (e) | An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
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| (f) | An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
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| (g) | A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
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| (h) | A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
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| (i) | A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
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| (j) | A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
please specify the type of institution:
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| (k) | Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
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| Item 4. | Ownership |
| (a) | Amount beneficially owned:
The Reporting Persons held securities of Terrestrial Energy Inc., a Delaware corporation ("Old Terrestrial"). On October 29, 2025, Old Terrestrial consummated a business combination with the Issuer (the "Business Combination"), and the Reporting Persons received securities of the Issuer at the closing of the Business Combination. The securities reported on this statement include (i) 180,316 Shares held directly by Mr. Sella; (ii) 539,117 Shares issuable upon the exercise of warrants held by Mr. Sella, having an exercise price of $2.24 per share; (iii) 12,244,088 Shares held jointly by Mr. Sella and Mr. Sella's spouse (iv) 223,515 Shares issuable upon the exercise of warrants held jointly by Mr. Sella and his spouse, having an exercise price of $2.24 per share; (v) 807,873 Shares held by the Trust; (vi) 730,446 Shares issuable upon the exercise of warrants held by the Trust, having an exercise price of $2.24 per share; and (vii) 653,334 Shares held by the Foundation. |
| (b) | Percent of class:
The following percentages are based on 81,771,423 Shares of the Issuer outstanding as of December 15, 2025 and 24,011,029 Shares issuable upon the conversion of the Exchange Shares. The aggregation of the outstanding Shares and the Exchange Shares is based solely upon statements and disclosures made by the Issuer.
(i) Mr. Sella: 12.38%
(ii) the Trust: 1.44%
(iii) the Foundation: 0.62% |
| (c) | Number of shares as to which the person has:
|
| | (i) Sole power to vote or to direct the vote:
(i) Mr. Sella: 719,433
(ii) the Trust: 0
(iii) the Foundation 0
|
| | (ii) Shared power to vote or to direct the vote:
(i) Mr. Sella: 14,659,256
(ii) the Trust: 1,538,319
(iii) the Foundation: 653,334
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| | (iii) Sole power to dispose or to direct the disposition of:
(i) Mr. Sella: 719,433
(ii) the Trust: 0
(iii) the Foundation 0
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| | (iv) Shared power to dispose or to direct the disposition of:
(i) Mr. Sella: 14,659,256
(ii) the Trust: 1,538,319
(iii) the Foundation: 653,334
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| Item 5. | Ownership of 5 Percent or Less of a Class. |
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Not Applicable
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| Item 6. | Ownership of more than 5 Percent on Behalf of Another Person. |
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If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required.
See items 2 and 4 of this statement for more information. |
| Item 7. | Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person. |
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Not Applicable
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| Item 8. | Identification and Classification of Members of the Group. |
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Not Applicable
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| Item 9. | Notice of Dissolution of Group. |
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Not Applicable
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Rule 13d-1(c)