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 |
|---|---|---|---|
| 8-K |
Current report
Regulation FD disclosure
|
Oct 20, 2026 | Oct 20, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 21, 2026 | Sep 21, 2026 |
| 8-K |
Current report
Other events
|
Jul 29, 2026 | Jul 29, 2026 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Jul 17, 2026 | Jul 17, 2026 |
| 8-K |
Current report
Other events
|
Jun 22, 2026 | Jun 22, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Apr 22, 2026 | Apr 22, 2026 |
| 8-K |
Current report
Restatement
|
Apr 9, 2026 | Apr 9, 2026 |
| 8-K |
Current report
Auditor change
|
Mar 5, 2026 | Feb 27, 2026 |
| 8-K |
Current report
Officer or director change
|
Feb 25, 2026 | Feb 18, 2026 |
| 8-K |
Current report
Material agreement, Unregistered share sale, Regulation FD disclosure, Other events
|
Feb 10, 2026 | Feb 5, 2026 |
| 8-K |
Current report
Officer or director change, Other events
|
Dec 22, 2025 | Dec 19, 2025 |
| 8-K |
Current report
Officer or director change
|
Dec 11, 2025 | Dec 9, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Dec 4, 2025 | Dec 4, 2025 |
| 8-K |
Current report
Material agreement
|
Nov 21, 2025 | Nov 17, 2025 |
| 8-K |
Current report
Officer or director change
|
Nov 12, 2025 | Nov 7, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Nov 7, 2025 | Nov 6, 2025 |
| 8-K |
Current report
Material agreement, Acquisition or sale of assets, Unregistered share sale, Change to shareholder rights, Auditor change, Change in control, Officer or director change, Bylaw or fiscal year change
|
Sep 11, 2025 | Sep 5, 2025 |
| 8-K |
Current report
Auditor change
|
Jul 28, 2022 | Jul 22, 2022 |
| 8-K |
Current report
Auditor change
|
Jul 19, 2022 | Jul 13, 2022 |
Showing 19 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)
Other Electric Services companies
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- Vistra Corp. VST
- Fortis Inc. FTS
Source: SEC EDGAR filings. This is company-reported data, not investment advice.