Nasdaq · CIK 0001918102
FISN DEEP FISSION, INC.
Insider trading from SEC Form 4. Last filing Dec 23, 2025.
Last 90 days
Net insider value
$0
no open-market trades
Buys
0
$0 by 0 insiders
Sells
0
$0 by 0 insiders
Insiders on file
10
with a Form 4 at this company
Signals
Open-market buys and sells at DEEP FISSION, INC., scored.
| Score | Insider | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 28Weak | Ian Seth Jacobs President, CEO, CFO, Secretary buy | $3 25,000 shares | +10% | - | |
| 15Weak | Mark N. Tompkins director, owner sell | $3 25,000 shares | -1% | - |
Transactions
The last 14 rows filed, every code.
| Date | Insider | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Dec 19, 2025 | Blake Janover director | AGrant or award Restricted Stock Unitderivative | +100,000 | $0.00 | $0 | 100,000 | Dec 23, 2025 |
| Nov 12, 2025 | Thomas S Glanville director | AGrant or award Restricted Stock Unitderivative | +100,000 | $0.00 | $0 | 100,000 | Dec 22, 2025 |
| Dec 9, 2025 | Elizabeth Muller Chief Executive Officer | AGrant or award Restricted Stock Units | +549,451 | $0.00 | $0 | 549,451 | Dec 12, 2025 |
| Dec 9, 2025 | Elizabeth Muller Chief Executive Officer | AGrant or award Stock Option (right to buy)derivative | +183,150 | $0.00 | $0 | 994,849 | Dec 12, 2025 |
| Nov 7, 2025 | Jonathan H Gordon See Remarks | AGrant or award Employee Stock Option (right to buy)derivative | +85,000 | $0.00 | $0 | 85,000 | Dec 4, 2025 |
| Nov 12, 2025 | Jonathon Angell director | AGrant or award Restricted Stock Unitderivative | +100,000 | $0.00 | $0 | 100,000 | Nov 17, 2025 |
| Nov 12, 2025 | Tepper Leslie Goldman director | AGrant or award Restricted Stock Unitsderivative | +100,000 | $0.00 | $0 | 100,000 | Nov 14, 2025 |
| Sep 5, 2025 | William Mark Schmitz Chief Financial Officer | AGrant or award Common Stock | +103,928 | - | - | 103,928 | Sep 9, 2025 |
| Sep 5, 2025 | Elizabeth Muller President and Chief Executive | AGrant or award Common Stock | +5,196,426 | - | - | 5,196,426 | Sep 9, 2025 |
| Sep 5, 2025 | Richard Muller Chief Technology Officer | AGrant or award Common Stock | +5,196,426 | - | - | 5,196,426 | Sep 9, 2025 |
| Sep 5, 2025 | Elizabeth Muller President and Chief Executive | AGrant or award Common Stockindirect: By Muller Family Trust | +5,057,855 | - | - | 5,057,855 | Sep 9, 2025 |
| Sep 5, 2025 | Mark N. Tompkins other | JOther Common Stock | -2,833,333 | $0.00 | $0 | 1,891,667 | Sep 8, 2025 |
| Aug 26, 2025 | Ian Seth Jacobs President, CEO, CFO, Secretary | POpen-market purchase Common Stock | +25,000 | $0.00 | $3 | 275,000 | Aug 28, 2025 |
| Aug 26, 2025 | Mark N. Tompkins director, owner | SOpen-market sale Common Stock | -25,000 | $0.00 | $3 | 4,725,000 | Aug 28, 2025 |
Insiders
Everyone who has filed a Form 4 here.
- Jonathon Angelldirector
- Thomas S Glanvilledirector
- Tepper Leslie Goldmandirector
- Jonathan H GordonSee Remarks
- Blake Janoverofficer, director
- Ian Seth JacobsPresident, CEO, CFO, Secretary
- Elizabeth MullerChief Executive Officer
- Richard MullerChief Technology Officer
- William Mark SchmitzChief Financial Officer
- Mark N. Tompkinsother, owner, director
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.