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 |
|---|---|---|---|
| EFFECT | Filing | Jun 17, 2026 | — |
| CERT | Filing | Jun 17, 2026 | — |
| 8-A12B | Filing | May 28, 2026 | — |
| EFFECT | Filing | May 1, 2026 | — |
| EFFECT | Filing | May 1, 2026 | — |
| CORRESP | Letter to the SEC | Apr 29, 2026 | — |
| DRS | Filing | Apr 22, 2026 | — |
| NT 10-K | Filing | Mar 31, 2026 | Dec 31, 2025 |
| UPLOAD | Letter from the SEC | Feb 23, 2026 | — |
| D | Filing | Feb 18, 2026 | — |
| EFFECT | Filing | Feb 5, 2026 | — |
| D | Filing | Sep 24, 2025 | — |
| D | Filing | Sep 23, 2025 | — |
| SC 14F1 | Schedule 14f-1 | Aug 25, 2025 | — |
| SEC STAFF ACTION | Filing | Apr 20, 2022 | — |
| 10-12G | General form for registration of securities | Mar 21, 2022 | — |
Showing 16 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.