# EDGAR Filing Document

**Accession Number:** 0002019804
**File Stem:** 0001104659-25-124059
**Filing Date:** 2025-12
**Character Count:** 2341
**Document Hash:** 3e3a64cb4ae68e13e6c0f0ac7fddd214
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-25-124059.hdr.sgml**: 20260421

**ACCESSION NUMBER**: 0001104659-25-124059

**CONFORMED SUBMISSION TYPE**: CORRESP

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20251223

**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:** CORRESP

**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

**Terrestrial Energy Inc.**

2730 W. Tyvola Road, Suite 100

Charlotte, NC 28217

December 23, 2025

**<u>Via Edgar</u>**

U.S. Securities and Exchange Commission

Division of Corporation Finance

100 F Street, N.E.

Washington, D.C. 20549

Attention: Jenny O'Shannick

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| | |
|:---|:---|
| Re: | **Terrestrial Energy Inc.** |
|  | **Registration Statement on Form S-1, as amended (File No. 333- 291796)** |

---

Ladies and Gentlemen:

Pursuant to Rule 461 under the Securities Act of 1933, as amended, and in connection with the captioned registration statement (the "<u>Registration Statement</u>"), Terrestrial Energy Inc. hereby respectfully requests that the Registration Statement be permitted to become effective on December 23, 2025, at 4:00 p.m., Eastern Time, or as soon thereafter as practicable.

If you have any questions or comments, please do not hesitate to contact Eliot W. Robinson, Esq. at (404) 572-6785 or Tyler F. Mark, Esq. at (303) 866-0238.

[Remainder of the page intentionally left blank]

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| | |
|:---|:---|
| **TERRESTRIAL ENERGY INC.** | **TERRESTRIAL ENERGY INC.** |
| Sincerely, | Sincerely, |
| By: | /s/ Brian Thrasher |
| Name: | Brian Thrasher |
| Title: | Chief Financial Officer |

---

Cc:

Eliot W. Robinson, Esq., Bryan Cave Leighton Paisner LLP

Tyler F. Mark, Esq., Bryan Cave Leighton Paisner LLP