# Deep Fission, Inc.: Form SCHEDULE 13D, filed Sep 23, 2025

- Company: [Deep Fission, Inc.](/companies/fisn.md) (CIK 1918102)
- Form: SCHEDULE 13D
- Filed: 2025-09-23
- Accepted by EDGAR: Sep 23, 2025, 21:43 ET
- Period: not reported
- Accession: 0001213900-25-090840
- Inline XBRL: no
- Main document: https://www.sec.gov/Archives/edgar/data/1918102/000121390025090840/xslSCHEDULE_13D_X01/primary_doc.xml
- All documents and exhibits: https://www.sec.gov/Archives/edgar/data/1918102/000121390025090840/

## 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/1918102/000121390025090840/xslSCHEDULE_13D_X01/primary_doc.xml

Filed Sep 23, 2025.
Source: SEC EDGAR, the filing index for accession 0001213900-25-090840. Last ingested by Listed: Nov 4, 2026, 19:30 ET. No prices; not investment advice.