Company Description
Deep Fission is a nuclear energy technology company developing a small modular reactor based on established pressurized water reactor technology, with novel emplacement in deep boreholes approximately one mile below the Earth’s surface.
Our reactor, which we refer to as the Gravity Reactor, will leverage subsurface conditions to support key containment and operating functions, including the use of hydrostatic pressure from a water column within the borehole to support reactor operating pressure and cooling, and the surrounding geological formation to provide structural confinement and shielding.
This approach is intended to reduce reliance on large surface containment structures and other safety-related infrastructure associated with conventional nuclear power plants, support faster deployment timelines, improve security, enhance safety, and enable lower capital and operating costs relative to conventional nuclear facilities, while reducing exposure to environmental and other surface-level hazards.
Each 3x3 Gravity Reactor is targeted to produce up to 15 megawatts of electric power output. Our commercialization strategy is based on a phased deployment plan designed to move toward commercialization in the next three years.
| Country | United States |
| Founded | 2023 |
| Industry | Uranium |
| Sector | Energy |
| Employees | 60 |
| CEO | Elizabeth Muller |
Contact Details
Address: 2001 Addison Street, Suite 300 Berkeley, CA 94704 United States | |
| Phone | (707) 400-0778 |
| Website | deepfission.com |
Stock Details
| Ticker Symbol | FISN |
| Exchange | NASDAQ |
| Fiscal Year | January - December |
| Reporting Currency | USD |
| CIK Code | 1918102 |
Key Executives
| Name | Position |
|---|---|
| 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) |
Latest SEC Filings
| Date | Type | Title |
|---|---|---|
| May 20, 2026 | S-1 | General form for registration of securities under the Securities Act of 1933 |
| May 15, 2026 | SCHEDULE 13G/A | Filing |
| May 8, 2026 | 10-Q | Quarterly Report |
| May 1, 2026 | EFFECT | Notice of Effectiveness |
| May 1, 2026 | EFFECT | Notice of Effectiveness |
| May 1, 2026 | 424B3 | Prospectus |
| May 1, 2026 | 424B3 | Prospectus |
| Apr 22, 2026 | 8-K | Current Report |
| Apr 22, 2026 | DRS | [Cover] Draft Registration Statement |
| Apr 21, 2026 | S-1/A | [Amend] General form for registration of securities under the Securities Act of 1933 |