# Deep Fission, Inc.: Form S-1/A, filed Apr 21, 2026

- Company: [Deep Fission, Inc.](/companies/fisn.md) (CIK 1918102)
- Form: S-1/A
- Filed: 2026-04-21
- Accepted by EDGAR: Apr 21, 2026, 15:50 ET
- Period: not reported
- Accession: 0001104659-26-045974
- Inline XBRL: yes
- Main document: https://www.sec.gov/Archives/edgar/data/1918102/000110465926045974/tmb-20251231xs1a.htm
- All documents and exhibits: https://www.sec.gov/Archives/edgar/data/1918102/000110465926045974/

## Sections

Sections are extracted only from 10-K and 10-Q reports. Read this filing’s documents on sec.gov. https://www.sec.gov/Archives/edgar/data/1918102/000110465926045974/tmb-20251231xs1a.htm

Filed Apr 21, 2026.
Source: SEC EDGAR, the filing index for accession 0001104659-26-045974. Last ingested by Listed: Nov 4, 2026, 19:30 ET. No prices; not investment advice.