DEEP FISSION, INC.
Close on Oct 19, 2026
- Market cap
- $201.66M
- P/E (TTM)
- –
- Dividend yield
- –
About Deep Fission
Electric Services, SIC 4911
Deep Fission is a nuclear energy technology company that develops small modular reactors known as Gravity Reactors. The system integrates established pressurized water reactor technology into deep boreholes roughly one mile underground, relying on hydrostatic pressure from water columns for cooling and operational pressure. The company plans to deploy standalone units or borehole clusters producing electrical power for high-demand users, with a primary commercial focus on hyperscale data centers, as well as utilities, industrial operators, and defense facilities. Its planned business model spans project equity participation from electricity sales, deployment services, technology licensing, and maintenance operations.
The development-stage company operates an initial field development site on approximately 100 leased acres in Parsons, Kansas, where it conducts geological surveys and has drilled a deep data acquisition well. In addition to candidate commercial sites under preliminary evaluation across Kansas, Texas, Utah, and internationally, the enterprise maintains its corporate presence in the United States, though the text does not identify a specific headquarters location.
Summary of the business section of Deep Fission's latest annual report, written by StockData.
Company profile
Company
- Legal name
- DEEP FISSION, INC.
- Founded
- 2023
- Headquarters
- Berkeley, CA
- Address
- 2831 Garber Street 94705
- Phone
- (707) 400-0778
- Employees
- 51, Dec 31, 2025
- Industry
- Electric Services
- Incorporated in
- Delaware
- Fiscal year ends
- December 31
- Auditor
- GRANT THORNTON LLP, Dallas, Texas
Stock & identifiers
- Ticker
- FISN
- Exchange
- Nasdaq
- IPO date
- Jun 18, 2026
- Shares outstanding
- 59M, Jul 27, 2026
- Filer category
- <br>Emerging growth company
- Stock splits
- 1-for-1.5 reverse, Apr 15, 2026
- SEC CIK
- 1918102
- CUSIP
- 243927100
- ISIN
- US2439271006
- EIN
- 87-4265302
Executives and directors
Officers and directors who filed ownership reports (Forms 3, 4, 5) in the last two years
| Name | Position | Shares owned |
|---|---|---|
| Ian Seth Jacobs | President, CEO, CFO, Secretary, Director | 275,000 |
| Richard Muller | Chief Technology Officer | 5,196,426 |
| Jonathan H. Gordon | General Counsel | – |
| Elizabeth Muller | Chief Executive Officer | 5,607,306 |
| William Mark Schmitz | Chief Financial Officer | 103,928 |
| Mark Wayne Peres | Chief Nuclear Officer | 86,607 |
| Michael Allen Brasel | Chief Operating Officer | – |
| Thomas S. Glanville | Director | – |
| Jonathon Angell | Director | 324,517 |
| Tepper Leslie Goldman | Director | 133,996 |
| Blake Janover | Director | – |
Employees
Headcount reported in annual reports
“As of the date of this Annual Report, we had 51 employees and 9 consultants.”
Corporate history
Events identified from SEC filings
| Date | Event | Details |
|---|---|---|
| Jun 18, 2026 | IPO | Initial public offering priced (424B4 prospectus) |
| May 28, 2026 | Listing | Registration of securities on an exchange (Form 8-A) |
| Mar 31, 2026 | Late filing | Notification of late filing |
| Mar 5, 2026 | Auditor change | Change in certifying accountant (8-K Item 4.01) |
| Sep 11, 2025 | Acquisition / sale | Completion of acquisition or disposition of assets (8-K Item 2.01) |
| Sep 11, 2025 | Auditor change | Change in certifying accountant (8-K Item 4.01) |
| Sep 8, 2025 | Name change | Name changed from Surfside Acquisition Inc. to DEEP FISSION, INC. |
| Jul 28, 2022 | Auditor change | Change in certifying accountant (8-K Item 4.01) |
| Jul 19, 2022 | Auditor change | Change in certifying accountant (8-K Item 4.01) |