Deep Fission, Inc. SEC filings FISN

Deep Fission, Inc. has 123 filings in SEC EDGAR's recent list, going back to Mar 21, 2022. Its latest annual report, Form 10-K, was filed on Apr 15, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Nov 4, 2026, covering the quarter ended Sep 30, 2026. The most recent current report (Form 8-K) was filed on Oct 20, 2026 (regulation fd disclosure). The company's fiscal year ends on December 31.

Form Description Filed Period
10-Q Quarterly report Nov 4, 2026 Sep 30, 2026
10-Q Quarterly report Aug 3, 2026 Jun 30, 2026
10-Q Quarterly report May 8, 2026 Mar 31, 2026
10-Q Quarterly report Nov 14, 2025 Sep 30, 2025
10-Q Quarterly report Aug 12, 2025 Jun 30, 2025
10-Q Quarterly report May 14, 2025 Mar 31, 2025
10-Q Quarterly report Nov 6, 2024 Sep 30, 2024
10-Q Quarterly report Aug 13, 2024 Jun 30, 2024
10-Q Quarterly report May 14, 2024 Mar 31, 2024
10-Q Quarterly report Nov 13, 2023 Sep 30, 2023
10-Q Quarterly report Aug 10, 2023 Jun 30, 2023
10-Q Quarterly report May 15, 2023 Mar 31, 2023
10-Q Quarterly report Nov 14, 2022 Sep 30, 2022
10-Q Quarterly report Aug 15, 2022 Jun 30, 2022
10-Q Quarterly report May 16, 2022 Mar 31, 2022

Showing 15 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.

New to this? Read What Are SEC Filings? 10-K, 10-Q, 8-K and Other Forms Explained.

Company profile

Industry
Electric Services (SIC 4911)
Listed as
FISN (Nasdaq)
Fiscal year ends
December 31
Incorporated in
DE
Headquarters
Berkeley, CA
SEC filer status
Non-accelerated filer, Smaller reporting company, Emerging growth company
SEC CIK
1918102
Former names
Surfside Acquisition Inc. (until Sep 8, 2025)

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Source: SEC EDGAR filings. This is company-reported data, not investment advice.