Terrestrial Energy Inc. /DE/ SEC filings IMSR
Terrestrial Energy Inc. /DE/ has 186 filings in SEC EDGAR's recent list, going back to Apr 26, 2024. Its latest annual report, Form ARS, was filed on Apr 29, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Aug 11, 2026, covering the quarter ended Jun 30, 2026. The most recent current report (Form 8-K) was filed on Oct 27, 2026 (other events). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 4 | Insider transaction | Oct 30, 2026 | Oct 28, 2026 |
| 4 | Insider transaction | Oct 26, 2026 | Oct 21, 2026 |
| 4 | Insider transaction | Oct 21, 2026 | Oct 19, 2026 |
| 3 | Initial insider ownership | Oct 21, 2026 | Oct 19, 2026 |
| 4 | Insider transaction | Oct 15, 2026 | Oct 14, 2026 |
| 4 | Insider transaction | Oct 14, 2026 | Oct 13, 2026 |
| 4 | Insider transaction | Oct 13, 2026 | Oct 9, 2026 |
| 4 | Insider transaction | Jul 31, 2026 | Jul 29, 2026 |
| 3 | Initial insider ownership | Jul 31, 2026 | Jul 29, 2026 |
| 4 | Insider transaction | Jul 27, 2026 | Jul 23, 2026 |
| 3 | Initial insider ownership | Jul 27, 2026 | Jul 23, 2026 |
| 4 | Insider transaction | Apr 14, 2026 | Apr 12, 2026 |
| 4 | Insider transaction | Apr 14, 2026 | Apr 12, 2026 |
| 4 | Insider transaction | Apr 14, 2026 | Apr 12, 2026 |
| 4 | Insider transaction | Apr 14, 2026 | Apr 12, 2026 |
| 3/A | Filing | Feb 17, 2026 | Oct 29, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 17, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Jan 22, 2026 | — |
| 3 | Initial insider ownership | Jan 22, 2026 | Oct 29, 2025 |
| 4/A | Amended statement of changes in beneficial ownership of securities | Jan 9, 2026 | Dec 18, 2025 |
| 4 | Insider transaction | Dec 22, 2025 | Dec 18, 2025 |
| 4 | Insider transaction | Dec 22, 2025 | Dec 18, 2025 |
| 4 | Insider transaction | Dec 22, 2025 | Dec 18, 2025 |
| 4 | Insider transaction | Dec 22, 2025 | Dec 18, 2025 |
| 4 | Insider transaction | Dec 22, 2025 | Dec 18, 2025 |
| 4 | Insider transaction | Dec 22, 2025 | Dec 18, 2025 |
| 4 | Insider transaction | Dec 22, 2025 | Dec 18, 2025 |
| 4 | Insider transaction | Nov 13, 2025 | Nov 6, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 12, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 12, 2025 | — |
| 3 | Initial insider ownership | Nov 7, 2025 | Oct 28, 2025 |
| 3 | Initial insider ownership | Nov 7, 2025 | Oct 28, 2025 |
| 3 | Initial insider ownership | Nov 7, 2025 | Oct 28, 2025 |
| 3 | Initial insider ownership | Nov 7, 2025 | Oct 28, 2025 |
| 3 | Initial insider ownership | Nov 7, 2025 | Oct 28, 2025 |
| 3 | Initial insider ownership | Nov 7, 2025 | Oct 28, 2025 |
| 3 | Initial insider ownership | Nov 7, 2025 | Oct 28, 2025 |
| 3 | Initial insider ownership | Nov 7, 2025 | Oct 28, 2025 |
| 3 | Initial insider ownership | Nov 7, 2025 | Oct 28, 2025 |
| 3 | Initial insider ownership | Nov 7, 2025 | Oct 28, 2025 |
| 3 | Initial insider ownership | Nov 7, 2025 | Oct 28, 2025 |
| SCHEDULE 13D | Ownership over 5% (active) | Nov 4, 2025 | — |
| SCHEDULE 13D | Ownership over 5% (active) | Nov 4, 2025 | — |
| 4 | Insider transaction | Oct 30, 2025 | Oct 28, 2025 |
| 4 | Insider transaction | Oct 30, 2025 | Oct 28, 2025 |
| 4 | Insider transaction | Oct 30, 2025 | Oct 28, 2025 |
| 4 | Insider transaction | Oct 30, 2025 | Oct 28, 2025 |
| 4 | Insider transaction | Oct 30, 2025 | Oct 28, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Sep 30, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 13, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 8, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 6, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Jun 2, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 12, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Mar 31, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 21, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 13, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 12, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 11, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 7, 2025 | — |
| SC 13G | Ownership over 5% (passive) | Nov 14, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Nov 14, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Nov 14, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Nov 6, 2024 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Oct 17, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Aug 26, 2024 | — |
| 4 | Insider transaction | Aug 20, 2024 | Aug 19, 2024 |
| 4 | Insider transaction | Aug 20, 2024 | Aug 19, 2024 |
| 4 | Insider transaction | Aug 20, 2024 | Aug 19, 2024 |
| 4 | Insider transaction | Aug 20, 2024 | Aug 19, 2024 |
| 3 | Initial insider ownership | Aug 15, 2024 | Aug 15, 2024 |
| 3 | Initial insider ownership | Aug 15, 2024 | Aug 15, 2024 |
| 3 | Initial insider ownership | Aug 15, 2024 | Aug 15, 2024 |
| 3 | Initial insider ownership | Aug 15, 2024 | Aug 15, 2024 |
| 3 | Initial insider ownership | Aug 15, 2024 | Aug 15, 2024 |
Showing 80 filings. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
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Company profile
- Industry
- Fabricated Plate Work (Boiler Shops) (SIC 3443)
- Listed as
- IMSR (Nasdaq), IMSRW (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Charlotte, NC
- SEC filer status
- , Emerging growth company
- SEC CIK
- 2019804
- Former names
- HCM II Acquisition Corp. (until Oct 29, 2025)
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.