---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-25-107929"
form_type: "8-K"
ticker: "FISN"
cik: "0001918102"
company_name: "DEEP FISSION, INC."
filed_at: "2025-11-07T23:59:59+00:00"
generated_at: "2026-05-16T23:09:34.214433+00:00"
event_type: "other_material"
sentiment: "positive"
materiality_score: 0.8
calibrated_materiality_score: 0.8
confidence: "high"
source: SEC EDGAR
---

# Deep Fission selected for DOE reactor pilot; partnership with Endeavour for 2 GW data center power

## Summary
- Selected as one of 11 companies for DOE Nuclear Reactor Pilot Program; target criticality by July 4, 2026.
- Partnered with Endeavour to co-develop 2 GW of nuclear energy for data centers targeting cloud providers.
- Target LCOE of $50-70/MWh and estimated 6-month build time from breaking ground to full production.
- LOIs secured at three sites (Kansas, Texas, Utah) for first commercial projects expected in 2027.
- 24 pending patent applications; 40+ unique innovations; leadership includes Elizabeth Muller (CEO) and Richard Muller (CTO).

## SEC filing metadata
- accession: 0001104659-25-107929
- form_type: 8-K
- ticker: FISN
- cik: 0001918102
- company_name: DEEP FISSION, INC.
- filed_at: 2025-11-07T23:59:59+00:00
- event_type: other_material
- sentiment: positive
- materiality_score: 0.8
- calibrated_materiality_score: 0.8
- confidence: high
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1918102/000110465925107929/0001104659-25-107929-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1918102/000110465925107929/tm2530540d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-25-107929
- JSON: https://secwatch.observer/filing/0001104659-25-107929.json
- Plain text: https://secwatch.observer/filing/0001104659-25-107929.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.