About
Deep Fission, Inc.
Deep Fission, Inc. develops and deploys small modular nuclear reactors placed deep underground to generate electricity. The company provides small modular nuclear reactors designed for underground installation at a depth of one mile, offering carbon-free energy and capacity solutions.
It delivers scalable reactor configurations for onsite power needs or flexible offtake agreements in wholesale power markets, manages the licensing process with regulatory authorities, and supports strategic development for decarbonization and reliability goals.
Deep Fission, Inc. Overview
Ticker, listing venue and issuer profile
Offer & Key Dates
Pricing terms and IPO milestones
Change from offer price to today
Live Market Snapshot
Real-time price; headline % change is vs first trade (listing price)
USD · NASDAQ:NASDAQ:FISN
Valuation & Multiples
Key valuation ratios and metrics
Financial Health
Balance sheet strength and liquidity
Financial Highlights
Historical financial performance
Historical Data
Market history and supplemental quote data
| Date | Open | High | Low | Close | Adj. Close | Change | Volume |
|---|---|---|---|---|---|---|---|
| 2026-06-29 | $11.24 | $11.24 | $9.64 | $11.05 | $11.05 | -0.19 | 277,700 |
| 2026-06-26 | $10.40 | $11.43 | $9.74 | $10.75 | $10.75 | +0.35 | 591,700 |
| 2026-06-25 | $10.03 | $10.48 | $7.66 | $10.03 | $10.03 | 0.00 | 823,200 |
| 2026-06-24 | $14.50 | $14.57 | $9.56 | $9.76 | $9.76 | -4.74 | 1,339,000 |
| 2026-06-23 | $12.00 | $13.25 | $11.88 | $12.44 | $12.44 | +0.44 | 805,300 |
| 2026-06-22 | $13.61 | $15.50 | $11.53 | $12.42 | $12.42 | -1.19 | 1,609,200 |
| 2026-06-18 | $16.00 | $19.00 | $14.56 | $14.56 | $14.56 | -1.44 | 2,779,000 |
SEC Filings
Official documents from SEC EDGAR
| Form | Filing Date | Document |
|---|---|---|
| 8-K | Jun 22, 2026 | Current Report |
| 424B4 | Jun 18, 2026 | Prospectus |
| EFFECT | Jun 17, 2026 | Notice of Effectiveness |
| DEF 14A | Jun 17, 2026 | Other definitive proxy statements |
| CERT | Jun 17, 2026 | Certification by an exchange approving securities for listing |
| S-1/A | Jun 10, 2026 | [Amend] General form for registration of securities under the Securities Act of 1933 |
| 8-A12B | May 28, 2026 | Registration of securities |
| S-1 | May 20, 2026 | General form for registration of securities under the Securities Act of 1933 |
| SCHEDULE 13G/A | May 15, 2026 | Filing |
| 10-Q | May 8, 2026 | Quarterly Report |
Company Info
Contact and headquarters details
Leadership
Key executives and officers
Elizabeth Muller
Chair of the board of directors (Class III); President and Chief Executive Officer
Richard A. Muller
Chief Technology Officer
William (Mark) Schmitz
Chief Financial Officer
Michael Brasel
Chief Operating Officer
Jon Gordon
General Counsel & Secretary
Mark Peres
Chief Nuclear Officer
Stacy Tarver Patterson
Chief Marketing Officer
Blake Janover
Director (Class I)
Leslie Goldman Tepper
Director (Class I)
Jonathon Angell
Director (Class II)
