Deep Fission Inc.
Last updated September 27, 2026
Organization details
- Legal name
- Deep Fission Inc.
- Former names
- Surfside Acquisition Inc.
- Ownership
- Public
- Status
- Active
- SIC code
- 4911 — Electric Services
- Jurisdiction of incorporation
- Delaware
- Headquarters city
- Berkeley
- Headquarters state / province
- California
- Headquarters country
- United States
- Fiscal year end
- December
- Ticker symbol
- FISN
- Primary stock exchange
- Nasdaq
Identifiers
- SEC CIK
- 0001918102
- EIN
- 87-4265302
Board of directors
-
Blake Janover · DirectorSince 2025
-
Elizabeth Muller · Director · President and Chief ExecutiveSince 2025
-
Ian Seth Jacobs · Director · President, CEO, CFO, SecretarySince 2025
-
Jonathon Angell · DirectorSince 2025
-
Mark N. Tompkins · DirectorSince 2025
-
Richard Muller · Director · Chief Technology OfficerSince 2025
-
Tepper Leslie Goldman · DirectorSince 2025
-
Thomas S. Glanville · DirectorSince 2025
Chief executives
Ian Seth Jacobs
· President, CEO, CFO, Secretary
Dates unknown
Elizabeth Muller
· President and Chief Executive
Since September 2025
Director election results
Annual meeting of July 17, 2026. Support is votes for as a share of votes for and against (or withheld). Below 80% is a clear protest.
-
98.9%
Board connections
3 of this board's directors also sit on 4 other boards.
- via Blake Janover
- via Thomas S. Glanville
- via Blake Janover
- via Tepper Leslie Goldman
Insider trades
All notable trades →From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.
- Bought, last 12 months
- $0
- 0 purchases by 0 insiders
- Sold, last 12 months
- $0
- 0 sales by 0 insiders
| Date | Insider | Transaction | Shares | Price | Value |
|---|---|---|---|---|---|
| Dec 9, 2025 | Elizabeth Muller Officer (Chief Executive Officer) | Grant or award | +549,451 | — | — |
| Sep 5, 2025 | Richard Muller Director, Officer (Chief Technology Officer) | Grant or award | +5,196,426 | — | — |
| Sep 5, 2025 | Elizabeth Muller Director, Officer (President and Chief Executive) | Grant or award | +5,196,426 | — | — |
| Sep 5, 2025 | Schmitz William Mark Officer (Chief Financial Officer) | Grant or award | +103,928 | — | — |
| Sep 5, 2025 | Mark N. Tompkins See Remarks | Other | −2,833,333 | — | — |
| Sep 5, 2025 | Elizabeth Muller Director, Officer (President and Chief Executive) | Grant or award | +5,057,855 | — | — |
| Aug 26, 2025 | Mark N. Tompkins Director, 10% owner | Open-market sale | −25,000 | — | — |
| Aug 26, 2025 | Ian Seth Jacobs Director, Officer (President, CEO, CFO, Secretary) | Open-market purchase | +25,000 | — | — |
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