Terrestrial Energy Inc. /DE/ SEC EDGAR Filings (CIK 0002019804)

SEC EDGAR filings, ownership reports, and insider transactions for Terrestrial Energy Inc. /DE/.

Symbol
IMSR, IMSRW on Nasdaq
Industry
Fabricated Plate Work (Boiler Shops) (Office Of Manufacturing)
Business address
2730 W. Tyvola Road, Suite 100, Charlotte, NC, 28217
State of incorporation
DE
Fiscal year end
31 December
Former names
HCM II Acquisition Corp. (to 29 Oct 2025)
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Terrestrial Energy Inc. /DE/ has filed 127 SEC EDGAR filings since 26 Apr 2024

Latest Filings

Recent SEC filings for Terrestrial Energy Inc. /DE/ including SCHEDULE 13G, 3, 4/A and more.

Form type Document Filing Description Filing date Reporting date File number(s)
SCHEDULE 13G Open SCHEDULE 13G document View SEC filing for SCHEDULE 13G 22 Jan 2026 005-94602
3 Open 3 document View SEC filing for 3 22 Jan 2026 29 Oct 2025
4/A Open 4/A document View SEC filing for 4/A AMENDED STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES 09 Jan 2026 18 Dec 2025
424B3 Open 424B3 document View SEC filing for 424B3 424B3 05 Jan 2026 333-288735
S-8 Open S-8 document | Open XBRL data View SEC filing for S-8 FORM S-8 05 Jan 2026 333-292571
424B3 Open 424B3 document View SEC filing for 424B3 424B3 30 Dec 2025 333-291796
EFFECT Open EFFECT document View SEC filing for EFFECT 23 Dec 2025 333-291796
S-1/A Open S-1/A document | Open XBRL data View SEC filing for S-1/A S-1/A 22 Dec 2025 333-291796
4 Open 4 document View SEC filing for 4 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES 22 Dec 2025 18 Dec 2025
4 Open 4 document View SEC filing for 4 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES 22 Dec 2025 18 Dec 2025
4 Open 4 document View SEC filing for 4 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES 22 Dec 2025 18 Dec 2025
4 Open 4 document View SEC filing for 4 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES 22 Dec 2025 18 Dec 2025
4 Open 4 document View SEC filing for 4 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES 22 Dec 2025 18 Dec 2025
4 Open 4 document View SEC filing for 4 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES 22 Dec 2025 18 Dec 2025
4 Open 4 document View SEC filing for 4 22 Dec 2025 18 Dec 2025
S-1 Open S-1 document | Open XBRL data View SEC filing for S-1 S-1 26 Nov 2025 333-291796
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K FORM 8-K 24 Nov 2025 21 Nov 2025 001-42252
10-Q/A Open 10-Q/A document | Open XBRL data View SEC filing for 10-Q/A FORM 10-Q/A 21 Nov 2025 30 Sep 2025 001-42252
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q QUARTERLY REPORT 14 Nov 2025 30 Sep 2025 001-42252
8-K/A Open 8-K/A document | Open XBRL data View SEC filing for 8-K/A FORM 8-K/A 14 Nov 2025 28 Oct 2025 001-42252
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 13 Nov 2025 06 Nov 2025
SCHEDULE 13G/A Open SCHEDULE 13G/A document View SEC filing for SCHEDULE 13G/A 12 Nov 2025 005-94602
SCHEDULE 13G/A Open SCHEDULE 13G/A document View SEC filing for SCHEDULE 13G/A 12 Nov 2025 005-94602
3 Open 3 document View SEC filing for 3 OWNERSHIP DOCUMENT 07 Nov 2025 28 Oct 2025
3 Open 3 document View SEC filing for 3 OWNERSHIP DOCUMENT 07 Nov 2025 28 Oct 2025
3 Open 3 document View SEC filing for 3 OWNERSHIP DOCUMENT 07 Nov 2025 28 Oct 2025
3 Open 3 document View SEC filing for 3 OWNERSHIP DOCUMENT 07 Nov 2025 28 Oct 2025
3 Open 3 document View SEC filing for 3 OWNERSHIP DOCUMENT 07 Nov 2025 28 Oct 2025
3 Open 3 document View SEC filing for 3 OWNERSHIP DOCUMENT 07 Nov 2025 28 Oct 2025
3 Open 3 document View SEC filing for 3 OWNERSHIP DOCUMENT 07 Nov 2025 28 Oct 2025
3 Open 3 document View SEC filing for 3 OWNERSHIP DOCUMENT 07 Nov 2025 28 Oct 2025
3 Open 3 document View SEC filing for 3 OWNERSHIP DOCUMENT 07 Nov 2025 28 Oct 2025
3 Open 3 document View SEC filing for 3 OWNERSHIP DOCUMENT 07 Nov 2025 28 Oct 2025
3 Open 3 document View SEC filing for 3 OWNERSHIP DOCUMENT 07 Nov 2025 28 Oct 2025
SCHEDULE 13D Open SCHEDULE 13D document View SEC filing for SCHEDULE 13D 04 Nov 2025 005-94602
SCHEDULE 13D Open SCHEDULE 13D document View SEC filing for SCHEDULE 13D 04 Nov 2025 005-94602
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K CURRENT REPORT 03 Nov 2025 28 Oct 2025 001-42252
4 Open 4 document View SEC filing for 4 30 Oct 2025 28 Oct 2025
4 Open 4 document View SEC filing for 4 30 Oct 2025 28 Oct 2025
4 Open 4 document View SEC filing for 4 30 Oct 2025 28 Oct 2025
4 Open 4 document View SEC filing for 4 30 Oct 2025 28 Oct 2025
4 Open 4 document View SEC filing for 4 30 Oct 2025 28 Oct 2025
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K CURRENT REPORT 29 Oct 2025 23 Oct 2025 001-42252
425 Open 425 document View SEC filing for 425 CURRENT REPORT 22 Oct 2025 001-42252
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K CURRENT REPORT 22 Oct 2025 22 Oct 2025 001-42252
425 Open 425 document View SEC filing for 425 FORM 425 02 Oct 2025 001-42252
SCHEDULE 13G Open SCHEDULE 13G document View SEC filing for SCHEDULE 13G 30 Sep 2025 005-94602
425 Open 425 document View SEC filing for 425 CURRENT REPORT 29 Sep 2025 001-42252
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K CURRENT REPORT 29 Sep 2025 29 Sep 2025 001-42252
EFFECT Open EFFECT document View SEC filing for EFFECT 26 Sep 2025 333-288735
424B3 Open 424B3 document View SEC filing for 424B3 PROSPECTUS 26 Sep 2025 333-288735
S-4/A Open S-4/A document | Open XBRL data View SEC filing for S-4/A REGISTRATION STATEMENT 23 Sep 2025 333-288735
S-4/A Open S-4/A document | Open XBRL data View SEC filing for S-4/A REGISTRATION STATEMENT 16 Sep 2025 333-288735
425 Open 425 document View SEC filing for 425 FORM 425 04 Sep 2025 001-42252
S-4/A Open S-4/A document | Open XBRL data View SEC filing for S-4/A REGISTRATION STATEMENT 04 Sep 2025 333-288735
S-4/A Open S-4/A document | Open XBRL data View SEC filing for S-4/A REGISTRATION STATEMENT 15 Aug 2025 333-288735
425 Open 425 document View SEC filing for 425 FORM 425 15 Aug 2025 001-42252
SCHEDULE 13G/A Open SCHEDULE 13G/A document View SEC filing for SCHEDULE 13G/A 14 Aug 2025 005-94602
SCHEDULE 13G/A Open SCHEDULE 13G/A document View SEC filing for SCHEDULE 13G/A 14 Aug 2025 005-94602
SCHEDULE 13G/A Open SCHEDULE 13G/A document View SEC filing for SCHEDULE 13G/A 14 Aug 2025 005-94602
SCHEDULE 13G/A Open SCHEDULE 13G/A document View SEC filing for SCHEDULE 13G/A 13 Aug 2025 005-94602
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q QUARTERLY REPORT 12 Aug 2025 30 Jun 2025 001-42252
SCHEDULE 13G/A Open SCHEDULE 13G/A document View SEC filing for SCHEDULE 13G/A 08 Aug 2025 005-94602
425 Open 425 document View SEC filing for 425 FORM 425 06 Aug 2025 001-42252
SCHEDULE 13G/A Open SCHEDULE 13G/A document View SEC filing for SCHEDULE 13G/A 06 Aug 2025 005-94602
S-4 Open S-4 document | Open XBRL data View SEC filing for S-4 REGISTRATION STATEMENT 17 Jul 2025 333-288735
10-Q/A Open 10-Q/A document | Open XBRL data View SEC filing for 10-Q/A AMENDMENT NO. 1 TO FORM 10-Q 17 Jul 2025 31 Mar 2025 001-42252
10-K/A Open 10-K/A document | Open XBRL data View SEC filing for 10-K/A AMENDMENT NO. 1 TO FORM 10-K 17 Jul 2025 31 Dec 2024 001-42252
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K CURRENT REPORT 15 Jul 2025 15 Jul 2025 001-42252
425 Open 425 document View SEC filing for 425 FORM 425 24 Jun 2025 001-42252
425 Open 425 document View SEC filing for 425 FORM 425 24 Jun 2025 001-42252
SCHEDULE 13G Open SCHEDULE 13G document View SEC filing for SCHEDULE 13G 02 Jun 2025 005-94602
DRS Open DRS document View SEC filing for DRS 30 May 2025 377-08067
425 Open 425 document View SEC filing for 425 FORM 425 27 May 2025 001-42252
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q QUARTERLY REPORT 20 May 2025 31 Mar 2025 001-42252
NT 10-Q Open NT 10-Q document View SEC filing for NT 10-Q NOTIFICATION OF LATE FILING 16 May 2025 31 Mar 2025 001-42252
SCHEDULE 13G/A Open SCHEDULE 13G/A document View SEC filing for SCHEDULE 13G/A 15 May 2025 005-94602
SCHEDULE 13G/A Open SCHEDULE 13G/A document View SEC filing for SCHEDULE 13G/A 14 May 2025 005-94602
SCHEDULE 13G/A Open SCHEDULE 13G/A document View SEC filing for SCHEDULE 13G/A 12 May 2025 005-94602
10-K Open 10-K document | Open XBRL data View SEC filing for 10-K ANNUAL REPORT 31 Mar 2025 31 Dec 2024 001-42252
SCHEDULE 13G Open SCHEDULE 13G document View SEC filing for SCHEDULE 13G 31 Mar 2025 005-94602
425 Open 425 document View SEC filing for 425 FORM 425 28 Mar 2025 001-42252
425 Open 425 document View SEC filing for 425 FORM 425 26 Mar 2025 001-42252
DEFA14A Open DEFA14A document | Open XBRL data View SEC filing for DEFA14A CURRENT REPORT 26 Mar 2025 001-42252
425 Open 425 document | Open XBRL data View SEC filing for 425 CURRENT REPORT 26 Mar 2025 001-42252
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K CURRENT REPORT 26 Mar 2025 26 Mar 2025 001-42252
SCHEDULE 13G/A Open SCHEDULE 13G/A document View SEC filing for SCHEDULE 13G/A 21 Mar 2025 005-94602
SCHEDULE 13G/A Open SCHEDULE 13G/A document View SEC filing for SCHEDULE 13G/A 13 Feb 2025 005-94602
SCHEDULE 13G Open SCHEDULE 13G document View SEC filing for SCHEDULE 13G 12 Feb 2025 005-94602
SCHEDULE 13G/A Open SCHEDULE 13G/A document View SEC filing for SCHEDULE 13G/A 11 Feb 2025 005-94602
SCHEDULE 13G Open SCHEDULE 13G document View SEC filing for SCHEDULE 13G 07 Feb 2025 005-94602
SC 13G Open SC 13G document View SEC filing for SC 13G 13G HONDU 14 Nov 2024 005-94602
SC 13G Open SC 13G document View SEC filing for SC 13G 14 Nov 2024 005-94602
SC 13G Open SC 13G document View SEC filing for SC 13G AQR CAPITAL MANAGEMENT LLC 14 Nov 2024 005-94602
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q QUARTERLY REPORT 13 Nov 2024 30 Sep 2024 001-42252
SC 13G Open SC 13G document View SEC filing for SC 13G SC 13G 06 Nov 2024 005-94602
SCHEDULE 13G Open SCHEDULE 13G document View SEC filing for SCHEDULE 13G 17 Oct 2024 005-94602
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K CURRENT REPORT 10 Oct 2024 10 Oct 2024 001-42252
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q QUARTERLY REPORT 27 Sep 2024 30 Jun 2024 001-42252
SC 13G Open SC 13G document View SEC filing for SC 13G SC 13G 26 Aug 2024 005-94602
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K FORM 8-K 23 Aug 2024 23 Aug 2024 001-42252
4 Open 4 document View SEC filing for 4 FORM 4 20 Aug 2024 19 Aug 2024
4 Open 4 document View SEC filing for 4 FORM 4 20 Aug 2024 19 Aug 2024
4 Open 4 document View SEC filing for 4 FORM 4 20 Aug 2024 19 Aug 2024
4 Open 4 document View SEC filing for 4 FORM 4 20 Aug 2024 19 Aug 2024
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K FORM 8-K 20 Aug 2024 15 Aug 2024 001-42252
424B4 Open 424B4 document View SEC filing for 424B4 424B4 16 Aug 2024 333-280283
EFFECT Open EFFECT document View SEC filing for EFFECT 15 Aug 2024 333-280283
3 Open 3 document View SEC filing for 3 FORM 3 15 Aug 2024 15 Aug 2024
3 Open 3 document View SEC filing for 3 FORM 3 15 Aug 2024 15 Aug 2024
3 Open 3 document View SEC filing for 3 FORM 3 15 Aug 2024 15 Aug 2024
3 Open 3 document View SEC filing for 3 FORM 3 15 Aug 2024 15 Aug 2024
3 Open 3 document View SEC filing for 3 FORM 3 15 Aug 2024 15 Aug 2024
CERT Open CERT document View SEC filing for CERT 15 Aug 2024 001-42252
8-A12B Open 8-A12B document View SEC filing for 8-A12B 8-A12B 15 Aug 2024 001-42252
CORRESP Open CORRESP document View SEC filing for CORRESP 13 Aug 2024
CORRESP Open CORRESP document View SEC filing for CORRESP 13 Aug 2024
CORRESP Open CORRESP document View SEC filing for CORRESP 02 Aug 2024
S-1/A Open S-1/A document View SEC filing for S-1/A S-1/A 02 Aug 2024 333-280283
UPLOAD Open UPLOAD document View SEC filing for UPLOAD 31 Jul 2024 377-07204
CORRESP Open CORRESP document View SEC filing for CORRESP 19 Jul 2024
S-1/A Open S-1/A document View SEC filing for S-1/A S-1/A 19 Jul 2024 333-280283
UPLOAD Open UPLOAD document View SEC filing for UPLOAD 10 Jul 2024 377-07204
S-1/A Open S-1/A document View SEC filing for S-1/A S-1/A 05 Jul 2024 333-280283
S-1 Open S-1 document View SEC filing for S-1 S-1 18 Jun 2024 333-280283
UPLOAD Open UPLOAD document View SEC filing for UPLOAD 24 May 2024 377-07204
DRS Open DRS document View SEC filing for DRS 26 Apr 2024 377-07204

About this filer

Terrestrial Energy Inc. /DE/ files with the SEC under CIK 0002019804. This page aggregates EDGAR filings and related ownership activity.

Industry: Fabricated Plate Work (Boiler Shops).

See insider transactions for this issuer.

FAQ

What is a CIK?
A Central Index Key (CIK) is a unique identifier assigned by the SEC to each filer.
Why are some filings missing?
New filings appear as the SEC updates EDGAR, and older records can vary by availability.
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Updates follow new EDGAR submissions and periodic data refreshes.

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