Company Description
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.
The company also provides advisory and partnership services for deployment and operation of its reactor technology, using artificial intelligence to streamline operations.
Deep Fission serves utilities, data centers, heavy industry, the military, government, and large cities.
The company was founded in 2023 and is based in Berkeley, California.
| Country | United States |
| Founded | 2023 |
| IPO Date | Jun 18, 2026 |
| Industry | Uranium |
| Sector | Energy |
| Employees | 51 |
| CEO | Elizabeth Muller |
Contact Details
Address: 2001 Addison Street, Suite 300 Berkeley, California 94704 United States | |
| Phone | (707) 400-0778 |
| Website | deepfission.com |
Stock Details
| Ticker Symbol | FISN |
| Exchange | NASDAQ |
| Fiscal Year | January - December |
| Reporting Currency | USD |
| IPO Price | $16.00 |
| CIK Code | 1918102 |
| CUSIP Number | 243927100 |
| ISIN Number | US2439271006 |
| Employer ID | 87-4265302 |
| SIC Code | 4911 |
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 |
|---|---|---|
| Jun 22, 2026 | 8-K | Current Report |
| Jun 18, 2026 | 424B4 | Prospectus |
| Jun 17, 2026 | EFFECT | Notice of Effectiveness |
| Jun 17, 2026 | DEF 14A | Other definitive proxy statements |
| Jun 17, 2026 | CERT | Certification by an exchange approving securities for listing |
| Jun 10, 2026 | S-1/A | [Amend] General form for registration of securities under the Securities Act of 1933 |
| May 28, 2026 | 8-A12B | Registration of securities |
| 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 |