# EDGAR Filing Document

**Accession Number:** 0002019804
**File Stem:** 0001104659-25-114702
**Filing Date:** 2025-11
**Character Count:** 9728
**Document Hash:** 07f96520231ddd806925b264e010bff8
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-25-114702.hdr.sgml**: 20251121

**ACCESSION NUMBER**: 0001104659-25-114702

**CONFORMED SUBMISSION TYPE**: 10-Q/A

**PUBLIC DOCUMENT COUNT**: 15

**CONFORMED PERIOD OF REPORT**: 20250930

**FILED AS OF DATE**: 20251121

**DATE AS OF CHANGE**: 20251120

**FILER**: 

**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:** 10-Q/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-42252
- **FILM NUMBER:** 251504419

**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

?xml version='1.0' encoding='ASCII'?

**UNITED STATES** 

**SECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

(Amendment No. 1)

**FORM 10-Q/A**

**(MARK ONE)** 

⌧ **QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934**

**For the quarter ended <u>September 30, 2025</u>**

◻ **TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934**

**For the transition period from&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; to&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;** 

**Commission file number: 001-42252**

**TERRESTRIAL ENERGY INC.**

(Exact Name of Registrant as Specified in Its Charter)

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| | |
|:---|:---|
| **Delaware** | **98-1785406** |
| (State or other jurisdiction of<br> incorporation or organization) | (I.R.S. Employer<br> Identification No.) |

---

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| | |
|:---|:---|
| **2730 W. Tyvola Road, Suite 100** <br> **Charlotte, NC** | **28217** |
| (Address of principal executive offices) | (Zip Code) |

---

**(646) 687-8212**

(Issuer's telephone number)

Securities registered pursuant to Section 12(b) of the Act:

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| | | |
|:---|:---|:---|
| **Title of each class** | **Trading Symbol(s)** | **Name of each exchange on which registered** |
| Common Stock, par value $0.0001 per share | IMSR | The Nasdaq Stock Market LLC |
| Redeemable Warrants, each whole warrant exercisable for one Common Stock at a price of $11.50 per share | IMSRW | The Nasdaq Stock Market LLC |

---

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ⌧ No ◻

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ⌧ No ◻

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer ¨ Accelerated filer ¨ <br> Non-accelerated filer x Smaller reporting company x <br> Emerging growth company x

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ◻

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ◻ No ⌧

As of November 14, 2025, there were 81,771,423 shares of the registrant's common stock, $0.0001 par value, outstanding. In addition, as of November 14, 2025, there were 24,011,029 shares of the registrant's common stock issuable upon exchange of outstanding exchangeable shares of a subsidiary, which are convertible into shares of common stock of the registrant on a one for one basis.

**EXPLANATORY NOTE**

This Amendment No. 1 on Form 10-Q/A (the "Amendment") is being filed solely (i) to correct the number of shares of common stock outstanding on the cover page of the registrant's Form 10-Q for the period ended September 30, 2025 (the "Original Filing") filed with the Securities and Exchange Commission (the "Commission") on November 14, 2025 and (ii) to correct the cover page check boxes erroneously indicating that the registrant was a shell company as of Original Filing and had not filed all reports required to be filed during the preceding 12 months. As previously reported in the Form 8-K filed by the registrant on November 3, 2025, the registrant ceased being a shell company upon the completion of the Merger as described in such Form 8-K. No other changes have been made to the Original Filing, whether to update the Original Filing to reflect events occurring subsequent to the filing of the Original Filing or otherwise.

As required by Rule 12b-15 of the Securities Exchange Act of 1934, as amended, this Form 10-Q/A contains new certifications by the registrant's principal executive officer and principal financial officer under Section 302 of the Sarbanes-Oxley Act of 2002, which are being filed as exhibits to this Form 10-Q/A. Because this Form 10-Q/A includes no financial statements, the registrant is not including certifications pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

**Item 6. Exhibits**

The following exhibits are filed as part of, or incorporated by reference into, this Quarterly Report on Form 10-Q.

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| | |
|:---|:---|
| **No.** | **Description of Exhibit** |
| 31.1\* | [Certification of Principal Executive Officer Pursuant to Securities Exchange Act Rules 13a-14(a), as adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.](tm2531886d1_ex31-1.htm) |
| 31.2\* | [Certification of Principal Financial Officer Pursuant to Securities Exchange Act Rules 13a-14(a), as adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.](tm2531886d1_ex31-2.htm) |
| 101.INS | Inline XBRL Instance Document |
| 101.SCH | Inline XBRL Taxonomy Extension Schema Document. |
| 101.CAL | Inline XBRL Taxonomy Extension Calculation Linkbase Document. |
| 101.DEF | Inline XBRL Taxonomy Extension Definition Linkbase Document. |
| 101.LAB | Inline XBRL Taxonomy Extension Label Linkbase Document. |
| 101.PRE | Inline XBRL Taxonomy Extension Presentation Linkbase Document. |
| 104 | Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101). |

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\* Filed herewith

**PART III - SIGNATURES**

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this Amendment No. 1 to be signed on its behalf by the undersigned, thereunto duly authorized.

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| | | |
|:---|:---|:---|
|  | **TERRESTRIAL ENERGY INC. f/k/a HCM II ACQUISITION CORP.** | **TERRESTRIAL ENERGY INC. f/k/a HCM II ACQUISITION CORP.** |
| Date: November 20, 2025 | By: | /s/ Simon Irish |
|  |  | Simon Irish |
|  |  | Chief Executive Officer |
|  |  | *(Principal Executive Officer)* |

---

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| | | |
|:---|:---|:---|
| Date: November 20, 2025 | By: | /s/ Brian Thrasher |
|  |  | Brian Thrasher |
|  |  | Chief Financial Officer |
|  |  | *(Principal Financial Officer)* |

---

## Exhibit 31.1

**Exhibit 31.1**

**CERTIFICATION OF CHIEF EXECUTIVE OFFICER**

**PURSUANT TO RULE 13A-14(A) UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002**

I, Simon Irish, certify that:

1. I
have reviewed this Amendment No. 1 to the Quarterly report on Form 10-Q/A of Terrestrial Energy Inc. f/k/a HCM II Acquisition Corp.;

2. Based
on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make
the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered
by this report;

Date: November 20, 2025

---

| |
|:---|
| /s/ Simon Irish |
| Simon Irish |
| Chief Executive Officer |
| (Principal Executive Officer) |

---

## Exhibit 31.2

**Exhibit 31.2**

**CERTIFICATION OF CHIEF FINANCIAL OFFICER**

**PURSUANT TO RULE 13A-14(A) UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002**

I, Brian Thrasher, certify that:

1. I
have reviewed this Amendment No. 1 to the Quarterly Report on Form 10-Q/A of Terrestrial Energy Inc. f/k/a HCM II Acquisition Corp.;

2. Based
on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make
the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered
by this report;

Date: November 20, 2025

---

| |
|:---|
| /s/ Brian Thrasher |
| Brian Thrasher |
| Chief Financial Officer |
| (Principal Financial and Accounting Officer) |

---