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 125 SEC EDGAR filings since 26 Apr 2024

Latest Filings

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