DEEP FISSION, INC.

Business address
2831 Garber Street, Berkeley, CA, 94705
State of incorporation
DE
Fiscal year end
31 December
Former names
Surfside Acquisition Inc. (to 08 Sep 2025)
Get insider transactions for this issuer
DEEP FISSION, INC. has filed 60 SEC EDGAR filings since 21 Mar 2022

Latest Filings

Form type Document Filing Description Filing date Reporting date File number(s)
4 Open Document Open Filing OWNERSHIP DOCUMENT 23 Dec 2025 19 Dec 2025
3 Open Document Open Filing OWNERSHIP DOCUMENT 23 Dec 2025 19 Dec 2025
8-K Open Document | Data Open Filing FORM 8-K 22 Dec 2025 19 Dec 2025 000-56407
4 Open Document Open Filing OWNERSHIP DOCUMENT 22 Dec 2025 12 Nov 2025
3 Open Document Open Filing OWNERSHIP DOCUMENT 22 Dec 2025 07 Nov 2025
4 Open Document Open Filing OWNERSHIP DOCUMENT 12 Dec 2025 09 Dec 2025
8-K Open Document | Data Open Filing FORM 8-K 11 Dec 2025 09 Dec 2025 000-56407
8-K Open Document | Data Open Filing FORM 8-K 04 Dec 2025 04 Dec 2025 000-56407
4 Open Document Open Filing OWNERSHIP DOCUMENT 04 Dec 2025 07 Nov 2025
3 Open Document Open Filing OWNERSHIP DOCUMENT 04 Dec 2025 07 Nov 2025
S-1/A Open Document | Data Open Filing S-1/A 01 Dec 2025 333-290438
8-K Open Document | Data Open Filing FORM 8-K 21 Nov 2025 17 Nov 2025 000-56407
4 Open Document Open Filing OWNERSHIP DOCUMENT 17 Nov 2025 12 Nov 2025
3 Open Document Open Filing OWNERSHIP DOCUMENT 17 Nov 2025 07 Nov 2025
4 Open Document Open Filing OWNERSHIP DOCUMENT 14 Nov 2025 12 Nov 2025
3 Open Document Open Filing OWNERSHIP DOCUMENT 14 Nov 2025 07 Nov 2025
10-Q Open Document | Data Open Filing 10-Q 14 Nov 2025 30 Sep 2025 000-56407
SCHEDULE 13G/A Open Document Open Filing 14 Nov 2025 005-93944
8-K Open Document | Data Open Filing CURRENT REPORT 12 Nov 2025 07 Nov 2025 000-56407
8-K Open Document | Data Open Filing FORM 8-K 07 Nov 2025 06 Nov 2025 000-56407
SCHEDULE 13G Open Document Open Filing 03 Nov 2025 005-93944
S-1/A Open Document | Data Open Filing AMENDMENT NO 1. TO FORM S-1 24 Sep 2025 333-290438
D Open Document Open Filing 24 Sep 2025 021-558495
SCHEDULE 13D Open Document Open Filing 23 Sep 2025 005-93944
SCHEDULE 13D Open Document Open Filing 23 Sep 2025 005-93944
D Open Document Open Filing 23 Sep 2025 021-558291
S-1 Open Document | Data Open Filing REGISTRATION STATEMENT 22 Sep 2025 333-290438
8-K Open Document | Data Open Filing CURRENT REPORT 11 Sep 2025 05 Sep 2025 000-56407
4 Open Document Open Filing 09 Sep 2025 05 Sep 2025
3 Open Document Open Filing 09 Sep 2025 05 Sep 2025
4 Open Document Open Filing 09 Sep 2025 05 Sep 2025
3 Open Document Open Filing 09 Sep 2025 05 Sep 2025
4 Open Document Open Filing 09 Sep 2025 05 Sep 2025
3 Open Document Open Filing 09 Sep 2025 05 Sep 2025
4 Open Document Open Filing 08 Sep 2025 05 Sep 2025
4 Open Document Open Filing 28 Aug 2025 26 Aug 2025
4 Open Document Open Filing 28 Aug 2025 26 Aug 2025
SC 14F1 Open Document Open Filing SCHEDULE 14F-1 25 Aug 2025 005-93944
10-Q Open Document | Data Open Filing QUARTERLY REPORT 12 Aug 2025 30 Jun 2025 000-56407
10-Q Open Document | Data Open Filing QUARTERLY REPORT 14 May 2025 31 Mar 2025 000-56407
10-K Open Document | Data Open Filing ANNUAL REPORT 28 Mar 2025 31 Dec 2024 000-56407
10-Q Open Document | Data Open Filing QUARTERLY REPORT 06 Nov 2024 30 Sep 2024 000-56407
10-Q Open Document | Data Open Filing QUARTERLY REPORT 13 Aug 2024 30 Jun 2024 000-56407
10-Q Open Document | Data Open Filing QUARTERLY REPORT 14 May 2024 31 Mar 2024 000-56407
10-K Open Document | Data Open Filing ANNUAL REPORT 01 Apr 2024 31 Dec 2023 000-56407
10-Q Open Document | Data Open Filing QUARTERLY REPORT 13 Nov 2023 30 Sep 2023 000-56407
10-Q Open Document | Data Open Filing QUARTERLY REPORT 10 Aug 2023 30 Jun 2023 000-56407
10-Q Open Document | Data Open Filing QUARTERLY REPORT 15 May 2023 31 Mar 2023 000-56407
10-K Open Document | Data Open Filing ANNUAL REPORT 31 Mar 2023 31 Dec 2022 000-56407
SC 13G Open Document Open Filing SCHEDULE 13G 13 Feb 2023 005-93944
SC 13G Open Document Open Filing SCHEDULE 13G 10 Feb 2023 005-93944
10-Q Open Document | Data Open Filing QUARTERLY REPORT 14 Nov 2022 30 Sep 2022 000-56407
10-Q Open Document | Data Open Filing QUARTERLY REPORT 15 Aug 2022 30 Jun 2022 000-56407
8-K Open Document | Data Open Filing CURRENT REPORT 28 Jul 2022 22 Jul 2022 000-56407
8-K Open Document | Data Open Filing CURRENT REPORT 19 Jul 2022 13 Jul 2022 000-56407
10-Q Open Document | Data Open Filing QUARTERLY REPORT 16 May 2022 31 Mar 2022 000-56407
3 Open Document Open Filing 20 Apr 2022 20 Apr 2022
3 Open Document Open Filing 20 Apr 2022 20 Apr 2022
SEC STAFF ACTION Open Document Open Filing 20 Apr 2022
10-12G Open Document Open Filing GENERAL FORM FOR REGISTRATION OF SECURITIES 21 Mar 2022 000-56407