DEEP FISSION, INC. (FISN)
Data as of , from SEC Form 4 filings.
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About DEEP FISSION, INC. (FISN)
The SEC lists DEEP FISSION, INC. under CIK 0001918102, in electric services. We track it alongside the rest of the Utilities sector. A registration statement was filed on 1 December 2025. No offering has priced.
FISN Form 4 activity by transaction type, last 90 days
No Form 4 activity for FISN in the last 90 days.
FISN insider transactions (Form 4)
2826 Form 4 filings on record, the earliest from Aug 26, 2025, newest first.
| Traded | 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 | - | |
| Richard Muller - Officer | Grant or award | Common Stock | 5,196,426 | - | - | |
| Elizabeth Muller - Officer | Grant or award | Common Stock | 5,196,426 | - | - | |
| Elizabeth Muller - Officer | Grant or award | Common Stock | 5,057,855 | - | - | |
| Mark N. Tompkins | Other | Common Stock | 2,833,333 | $0.00 | - | |
| William Mark Schmitz - Officer | Grant or award | Common Stock | 103,928 | - | - | |
| 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 |
FISN insider trading FAQ
What is the latest insider trade for FISN?
DEEP FISSION, INC. (FISN) has filed no insider reports in the last 90 days. The most recent on record is dated 27 July 2026. The full record for FISN runs to 26 Form 4 filings, the earliest from 26 August 2025. InsiderAlpha adds new Form 4, Form 144 and 8-K filings as they arrive from SEC EDGAR.
How many insiders are buying FISN stock?
No insider purchases of FISN were filed in the last 90 days. 1 purchase is on record for this company.
How many insiders are selling FISN stock?
No insider sales of FISN were filed in the last 90 days. 1 sale is on record for this company.
Where can I see FISN SEC filings (Form 4, 10-K, 10-Q, 8-K)?
This page collects FISN Form 4 insider transactions, Form 144 sale notices and 8-K filings in one place. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
More Utilities companies with insider activity
Recent insider filings
10The EDGAR links open each original Form 4, so you can check any number on this page against the filing it came from.
- - Thomas S. Glanville view on EDGAR
- - Blake Janover view on EDGAR
- - Tepper Leslie Goldman view on EDGAR
- - Jonathon Angell view on EDGAR
- - William Mark Schmitz view on EDGAR
- - Jonathon Angell view on EDGAR
- - Tepper Leslie Goldman view on EDGAR
- - Thomas S. Glanville view on EDGAR
- - Blake Janover view on EDGAR
Related companies with recent insider activity
Learn more
- What the Form 4 transaction codes mean
- Grants, option exercises, gifts and tax withholding are not trades on the market. The codes say which is which.
- Insider activity in Utilities
- Where FISN's peers are being bought and sold.
- Every recent Form 4
- The market-wide feed, updated as filings arrive from SEC EDGAR.
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- FISN on your watchlist
- Every FISN Form 4 filing on record
- Up to 3 months of FISN price history
- The daily trading plan of ranked insider buys, on a delay, with the plan archive
