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-K | Annual report | Apr 15, 2026 | Dec 31, 2025 |
| 10-K | Annual report | Mar 28, 2025 | Dec 31, 2024 |
| 10-K | Annual report | Apr 1, 2024 | Dec 31, 2023 |
| 10-K | Annual report | Mar 31, 2023 | Dec 31, 2022 |
Showing 4 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
- 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.