DEEP FISSION, INC. (FISN)
$8.01+$0.91 (+12.82%) Latest session
Thomas S. Glanville - Director
Blake Janover - Director
Tepper Leslie Goldman - DirectorDeep Fission Inc 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. Its reactor, which is referred 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. The group's focus is within the United States, where electricity demand growth, expanding digital infrastructure, and evolving energy policy.
| Form 4 transaction type | Transactions | Shares | Total value |
|---|---|---|---|
| Grant or award | 4 | 74,295 |
Dollar totals are shown for open-market purchases and sales only. Grants, option exercises, gifts and tax withholding are reported by share count because they are not trades at a market price.
26 Form 4 filings on record, the earliest from Aug 26, 2025, newest first.
| Date | Insider | Transaction | Security | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Thomas S. Glanville - Director | Grant or award | Restricted Stock Unit | 19,156 | $0.00 | - | |
| Blake Janover - Director | Grant or award | Restricted Stock Unit | 18,962 | $0.00 | - | |
| Tepper Leslie Goldman - Director | Grant or award | Restricted Stock Unit | 19,204 | $0.00 | - | |
| Jonathon Angell - Director | Grant or award | Restricted Stock Unit | 16,973 | $0.00 | - | |
| William Mark Schmitz - Officer | Grant or award | Employee Stock Option (right to buy) | 223,000 | $0.00 | - | |
| Jonathon Angell - Director | Grant or award | Restricted Stock Unit | 3,334 | $0.00 | - | |
| Tepper Leslie Goldman - Director | Grant or award | Restricted Stock Unit | 3,334 | $0.00 | - | |
| Thomas S. Glanville - Director | Grant or award | Restricted Stock Unit | 3,334 | $0.00 | - | |
| Blake Janover - Director | Grant or award | Restricted Stock Unit | 3,334 | $0.00 | - | |
| Elizabeth Muller - Officer | Grant or award | Employee Stock Option (right to buy) | 2,600,000 | $0.00 | - | |
| Richard Muller - Officer | Grant or award | Employee Stock Option (right to buy) | 223,000 | $0.00 | - | |
| Michael Allen Brasel - Officer | Grant or award | Employee Stock Option (right to buy) | 445,000 | $0.00 | - | |
| Mark Wayne Peres - Officer | Grant or award | Employee Stock Option (right to buy) | 223,000 | $0.00 | - | |
| Jonathan H. Gordon - Officer | Grant or award | Employee Stock Option (right to buy) | 223,000 | $0.00 | - | |
| Michael Allen Brasel - Officer | Grant or award | Employee Stock Option (right to buy) | 15,000 | $0.00 | - | |
| William Mark Schmitz - Officer | Grant or award | Employee Stock Option (right to buy) | 15,000 | $0.00 | - | |
| Jonathan H. Gordon - Officer | Grant or award | Employee Stock Option (right to buy) | 20,000 | $0.00 | - | |
| Mark Wayne Peres - Officer | Grant or award | Restricted Stock Unit | 25,000 | $0.00 | - | |
| Mark Wayne Peres - Officer | Grant or award | Employee Stock Option (right to buy) | 15,000 | $0.00 | - | |
| Jonathon Angell - Director | Grant or award | Restricted Stock Unit | 100,000 | $0.00 | - | |
| Tepper Leslie Goldman - Director | Grant or award | Restricted Stock Units | 100,000 | $0.00 | - | |
| Mark N. Tompkins | Other | Common Stock | 2,833,333 | $0.00 | - | |
| William Mark Schmitz - Officer | Grant or award | Common Stock | 103,928 | - | - | |
| Elizabeth Muller - Officer | Grant or award | Common Stock | 5,196,426 | - | - | |
| Elizabeth Muller - Officer | Grant or award | Common Stock | 5,057,855 | - | - | |
| Richard Muller - Officer | Grant or award | Common Stock | 5,196,426 | - | - | |
| Ian Seth Jacobs - Officer | Open-market purchase | Common Stock | 25,000 | $0.00 | $3 | |
| Mark N. Tompkins - Director | Open-market sale | Common Stock | 25,000 | $0.00 | $3 |
DEEP FISSION, INC. (FISN) had 4 insider filings in the last 90 days, with the most recent on 2026-07-27. The full record for FISN runs to 26 Form 4 filings, the earliest from 2025-08-26. InsiderAlpha tracks every Form 4, Form 144, and 8-K filing in real time.
No insider purchases of FISN were filed in the last 90 days. 1 purchase is on record for this company.
No insider sales of FISN were filed in the last 90 days. 1 sale is on record for this company.
This page tracks FISN Form 4 insider transactions, Form 144 sale notices, and 8-K material event disclosures in one timeline. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
Create a free InsiderAlpha account and press Watch on this page to add FISN to your watchlist. A free account also opens the full scored daily plan with every past day and 3 months of price history. No card is required. Sign up at https://insideralpha.ai/register.
Every Form 4 below links to the original document on SEC EDGAR, so the numbers on this page can be checked against the filing they came from.
Real-time Form 4 alerts, AI-scored daily trade ideas and 10b5-1 plan flags.
