# EDGAR Filing Document

**Accession Number:** 0002019804
**File Stem:** 0001104659-25-106325
**Filing Date:** 2025-11
**Character Count:** 20640
**Document Hash:** 1a1c1e033fe000b5b5cc828f036b88f5
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-25-106325.hdr.sgml**: 20251104

**ACCESSION NUMBER**: 0001104659-25-106325

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20251104

**DATE AS OF CHANGE**: 20251104

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Terrestrial Energy Inc. /DE/
- **CENTRAL INDEX KEY:** 0002019804
- **STANDARD INDUSTRIAL CLASSIFICATION:** FABRICATED PLATE WORK (BOILER SHOPS) [3443]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 981785406
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-94602
- **FILM NUMBER:** 251449755

**BUSINESS ADDRESS:**
- **STREET 1:** 2730 W. TYVOLA ROAD, SUITE 100
- **CITY:** CHARLOTTE
- **STATE:** NC
- **ZIP:** 28217
- **BUSINESS PHONE:** 203-930-2200

**MAIL ADDRESS:**
- **STREET 1:** 2730 W. TYVOLA ROAD, SUITE 100
- **CITY:** CHARLOTTE
- **STATE:** NC
- **ZIP:** 28217

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** HCM II Acquisition Corp.
- **DATE OF NAME CHANGE:** 20240415
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Irish Simon
- **CENTRAL INDEX KEY:** 0002091865

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D

**MAIL ADDRESS:**
- **STREET 1:** 2730 W. TYVOLA ROAD, SUITE 100
- **CITY:** CHARLOTTE
- **STATE:** NC
- **ZIP:** 28210

## Ex-2

**Exhibit 2**

**VOTING CO-ORDINATION AGREEMENT**

This VOTING CO-ORDINATION AGREEMENT (this "<u>Agreement</u>") is made October 28, 2025, by and between Dr. David LeBlanc ("<u>LeBlanc</u>") and Simon Irish ("<u>Irish</u>").

WHEREAS, LeBlanc and Irish were previously parties to that certain Voting Co-Ordination Continuance Agreement, dated April 5, 2024 (the "<u>TEDI Voting Agreement</u>"), by and among LeBlanc, Irish, Terrestrial Energy Development Inc., a Delaware corporation formerly known as "Terrestrial Energy Inc." ("<u>TEDI</u>"), Terrestrial Energy (Ontario) Inc., a corporation existing under the laws of the Province of Ontario formerly known as "Terrestrial Energy Inc.", and Canon Bryan, pursuant to which, among other things, LeBlanc granted Irish a proxy to vote on behalf of LeBlanc in Irish's sole discretion such that that Irish would control the voting with respect to at least an equal number of stockholder votes as LeBlanc in TEDI;

WHEREAS, effective as of the date of this Agreement, HCM II Merger Sub Inc., a Delaware corporation, has merged with and into TEDI, with TEDI continuing as the surviving corporation (the "<u>Merger</u>") and, as a result of the Merger, Irish and LeBlanc are no longer stockholders of TEDI or hold any securities convertible into capital stock of TEDI;

WHEREAS, effective as of the date of this Agreement, the TEDI Voting Agreement was terminated (the "<u>Termination</u>") pursuant to a Termination Agreement dated as of the date hereof; and

WHEREAS, in connection with the Merger and the Termination, Irish and LeBlanc desire to enter into this Agreement to give effect to the principle of an equality of voting power between them in connection with the voting of any matter submitted to the stockholders of Terrestrial Energy Inc., a Delaware corporation formerly known as "HCM II Acquisition Corp." ("<u>TEI</u>"), including through the voting of shares of common stock, par value $0.0001 per share ("<u>Common Stock</u>"), of TEI and shares of preferred stock designated as "Special Voting Preferred Stock", par value $0.0001 per share ("<u>Special Voting Preferred Stock</u>"), of TEI, in each case that they hold following consummation of the Merger.

NOW, THEREFORE, IT IS HEREBY AGREED, that in consideration of mutual promises contained herein and the payment of One Dollar ($1.00) from Irish to LeBlanc, the receipt and sufficiency of which is hereby acknowledged:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1. The following capitalized terms shall have them meanings attributed to them below when used in this Agreement:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a. "<u>Irish Controlled Votes</u>" means, without duplication, the Irish Votes and the SWH Votes.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;b. "<u>Irish Directed LeBlanc Votes</u>" means, as of the record date for any matter submitted to a vote of the stockholders of TEI, the total of (i)(A) the Irish Controlled Votes *plus* the LeBlanc Votes, *divided by* (B) two (2), rounded up to the nearest whole number, *less* (ii) the Irish Controlled Votes; <u>provided</u>, that if the Irish Directed LeBlanc Votes is less than zero (0), the Irish Directed LeBlanc Votes shall be deemed to be zero (0).

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;c. "<u>Irish Votes</u>" means the aggregate number of votes Irish is entitled to cast in connection with the shares TEI Stock held by Irish with respect to any matter subject to a vote of the stockholders of TEI (excluding the Irish Directed LeBlanc Votes), whether directly or indirectly, beneficially or of record, now owned or hereafter acquired.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;d. "<u>LeBlanc Votes</u>" means the aggregate number of votes LeBlanc is entitled to cast, with respect to any matter subject to a vote of the stockholders of TEI (without regard to this Agreement), in connection with the shares of TEI Stock held by LeBlanc, whether directly or indirectly, beneficially or of record, now owned or hereafter acquired.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;e. "<u>LeBlanc Unrestricted Votes</u>" means the number of LeBlanc Votes that are not Irish Directed LeBlanc Votes.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;f. "<u>SWH</u>" means, collectively, SWH CAPITAL DEFINED BENEFIT PLAN and SWH Capital LLC, a Delaware limited liability company.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;g. "<u>SWH Votes</u>" means the aggregate number of votes SWH is entitled to cast, with respect to any matter subject to a vote of the stockholders of TEI, in connection with the shares of TEI Stock held by SWH, whether directly or indirectly, beneficially or of record, now owned or hereafter acquired.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;h. "<u>TEI Stock</u>" means the Common Stock of TEI and the Special Voting Preferred Stock of TEI.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2. All actions of LeBlanc and Irish in relation to their shares in TEDI heretofore taken are expressly agreed, ratified and adopted by LeBlanc and Irish.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3. LeBlanc and Irish agree to certify the number of LeBlance Votes and Irish Directed Votes, respectively, to each other and TEI upon reasonable request. TEI is an intended third-party beneficiary of this paragraph. LeBlanc and Irish acknowledge and agree that TEI may rely on the ownership information so certified.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4. LeBlanc agrees that he shall exercise his votes in relation to the Irish Directed LeBlanc Votes as directed by Irish in his sole discretion for any matter submitted to a vote of the stockholders of TEI (including, for the avoidance of doubt, by written resolution).

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5. Any vote controlled by Irish or LeBlanc (caused by the aggregate of the number of Irish Controlled Votes and LeBlanc Votes being an odd number) which would result in an inequality between (i) the LeBlanc Unrestricted Votes and (ii) the aggregate of the Irish Controlled Votes and the Irish Directed LeBlanc Votes, shall not be cast by Irish or LeBlanc as the case may be.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6. Irish agrees that LeBlanc may vote the LeBlanc Unrestricted Votes at LeBlanc's sole discretion.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7. Nothing in this Agreement shall limit or restrict Irish or LeBlanc in acting in his capacity as a director or officer of TEI and exercising his fiduciary duties and responsibilities, it being understood that this Agreement applies to each of Irish and LeBlanc solely in their capacity as stockholders of TEI and does not apply to, and shall not limit or affect in any manner, Irish's or LeBlanc's actions, judgments or decisions as a director or officer of TEI.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8. This Agreement shall continue until, and shall terminate upon, the earlier of: (a) the date on which either Irish or LeBlanc beneficially owns less than 450,000 shares of Common Stock of TEI (including, in the case of LeBlanc, Common Stock of TEI which would be issuable upon an exchange of the exchangeable shares in the capital of ExchangeCo beneficially owned by LeBlanc) and (b) the date this Agreement is terminated by mutual written agreement of Irish and LeBlanc.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9. Amendments to this Agreement shall be in writing and signed by Irish and LeBlanc, and in the event that any provision is not enforceable, it shall be severed, and the remainder of this Agreement shall remain in full force and effect.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10. This Agreement shall be governed by the laws of the State of Delaware and each of Irish and LeBlanc submits to the jurisdiction of the courts of the State of Delaware.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11. This Agreement and any amendment to it may be evidenced by its being executed in one or more counterparts in paper or electronic form including but not limited to by facsimile or email or by exchange of. PDF versions of the Agreement signed by any appropriate electronic signature.

[*Remainder of page intentionally left blank. Signature page follows.*]

IN WITNESS WHEREOF, LeBlanc and Irish have executed this Agreement as of the date first set forth above.

---

| |
|:---|
| **LEBLANC:** |
| /s/ Dr. David LeBlanc |
| Name: Dr. David LeBlanc |
| **IRISH:** |
| **/s/** Simon Irish |
| Name: Simon Irish |

---

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**Terrestrial Energy Inc.**

*(Name of Issuer)*

**Common Stock**

*(Title of Class of Securities)*

**881454102**

*(CUSIP Number)*

**Simon Irish**<br>2730 W. Tyvola Road, Suite 100<br>Charlotte NC 28217<br>(646) 687-8212

*(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)*

**10/28/2025**

*(Date of Event Which Requires Filing of this Statement)*

| **CUSIP No.** | **881454102** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Simon Irish** | Name of reporting person<br>**Simon Irish** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**10572054.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**3014391.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**10572054.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**13586445.00** | Aggregate amount beneficially owned by each reporting person<br>**13586445.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**12.8%** | Percent of class represented by amount in Row (11)<br>**12.8%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Comment for Reporting Person:** (1)Includes (i) 2,818,520 shares held by SWH Capital LLC ("SWH"), (ii) 52,255 shares held by SWH Capital LLC Defined Benefit Plan ("SWH Benefit"), (iii) 5,271,236 shares underlying stock options which are vested or are expected to vest within 60 days of the date of this filing, (iv) 44,703 shares underlying warrants which are exercisable within 60 days of the date of this filing, (v) 89,406 shares underlying warrants held by SWH Benefit which are exercisable within 60 days of the date of this filing, and (vi) 3,014,391 shares that Mr. Irish has the power to direct the voting of pursuant to the Voting Agreement (as defined below). Mr. Irish maintains sole voting and investment power over the securities held by SWH and SWH Benefit and thus may be deemed to beneficially own such securities. Mr. Irish disclaims beneficial ownership of the shares held by SWH or SWH Benefits, except in each case to the extent of he has voting or investment power therein, if any.

(2)With respect to Row 13, the percentage is based on the quotient obtained by dividing (a) the number of shares of Common Stock beneficially owned by Mr. Irish by (b) the sum of 105,782,441 shares of Common Stock of the Issuer (inclusive of all shares of Common Stock issuable upon exchange of the ExchangeCo Shares (as defined below), outstanding as of October 28, 2025, immediately after giving effect to the consummation of the Business Combination (as defined in Item 3 below). "ExchangeCo Shares" means exchangeable shares in Terrestrial Energy Canada (Exchange) Inc., a corporation existing under the laws of the Province of Ontario, and an indirect, wholly owned subsidiary of the Issuer.

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common Stock

**(b) Name of Issuer:**
Terrestrial Energy Inc.

**(c) Address of Issuer's Principal Executive Offices:**
2730 W. Tyvola Road, Suite 100, Charlotte, NC, 28217

**Item 4. Purpose of Transaction**

The Reporting Person acquired the shares reported herein for investment purposes and to incentivize him in connection with his employment with the Issuer.

To the extent required by Item 4, the information contained in Item 3 and Item 6 is incorporated herein by reference.

The Reporting Person serves as Chief Executive Officer of the Issuer and as a member of the Issuer's Board of Directors and, in such capacities, may have influence over the corporate activities of the Issuer, including activities that may relate to items described in subparagraphs (a) through (j) of Item 4 of Schedule 13D. Subject to the that certain Lock-Up Agreement, as described in Item 6 of this Schedule 13D, and the Issuer's Insider Trading Policy (the "Insider Trading Policy"), the Reporting Person may from time to time buy or sell securities of the Issuer as appropriate for his personal circumstances.

Except as described herein, the Reporting Person does not have any present plans or proposals that relate to or would result in any of the transactions described in subparagraphs (a) through (j) of Item 4 of Schedule 13D. However, the Reporting Person reserves the right to formulate in the future plans or proposals that may relate to or result in the transactions described in subparagraphs (a) through (j) of Item 4 of Schedule 13D.

The Reporting Person may, from time to time, purchase additional securities of the Issuer either in the open market or in privately negotiated transactions, depending upon the Reporting Person's evaluation of the Issuer's business, prospects and financial condition, the market for such securities, other opportunities available to the Reporting Person, general economic conditions, stock market conditions and other factors. Depending upon the factors noted above, the Reporting Person may also decide to hold or dispose of all or part of his investments in securities of the Issuer and/or enter into derivative transactions with institutional counterparties with respect to the Issuer's securities, subject to the limitations under the Lock-Up, Insider Trading Policy and securities law.

**Item 5. Interest in Securities of the Issuer**

**(a)**
The information set forth in rows (7) through (13) of the cover pages of this Schedule 13D is incorporated by reference into this Item 5(a).

**(b)**
The information set forth in rows (7) through (10) of the cover pages of this Schedule 13D is incorporated by reference into this Item 5(b).

**(c)**
Except as set forth herein, no transactions in the Common Stock were effected by the Reporting Person during the past 60 days.

**Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.**

To the extent required by Item 6, the information contained in Item 3 is incorporated herein by reference.

On the Closing Date, the Reporting Person entered into a voting co-ordination agreement (the "Voting Agreement") with Dr. David LeBlanc, a stockholder of the Issuer and its Chief Technology Officer, pursuant to which to the extent Mr. LeBlanc would otherwise be entitled to cast more votes, on any matter submitted to stockholders of the Issuer, than Mr. Irish, Mr. LeBlanc has granted Mr. Irish the power to direct the voting of such excess shares. Giving effect to such arrangement, as of the date of this report, Mr. Irish also has sole voting power with respect to an additional 3,014,391 shares beneficially owned by Mr. LeBlanc. The foregoing description is qualified in its entirety by the text of the Voting Agreement, which is included as an exhibit under Item (7) and is incorporated herein by reference.

On the Closing Date the Reporting Person entered into a lock-up agreement (the "Lock-Up Agreement") with the Issuer, pursuant to which the Reporting Person agreed to restrictions on transfer for up to one year following the Closing Date with respect to the Lock-Up Shares (as defined in the Lock-Up Agreement), which lock-up, subject to certain exceptions and permitted transfers, including but not limited to, transfers to certain affiliates or family members, or the exercise of certain stock options and warrants. The Lock-Up Agreements further provide that following the 180th day following the Closing, (a) fifty percent (50%) of the Key Holder Lock-Up Shares may be transferred once the dollar volume-weighted average adjusted price for the New Terrestrial Common Shares calculated as an average for the prior twenty Business Days (the "VWAP") equals or exceeds $15.00 per share, and (b) all of the Key Holder Lock-Up Shares may be transferred once the VWAP equals or exceeds $20.00 per share. The foregoing description is qualified in its entirety by the text of the Lock Up Agreement, which is included as an exhibit under Item (7) and is incorporated herein by reference.

### SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Simon Irish

**Signature:** /s/ Simon Irish

**Name/Title:** Simon Irish

**Date:** 11/04/2025