🕵️ DEEP Fission, Inc. ($FISN)
SEC insider & ownership activity, last 12 months · CIK 1918102 · every row links its SEC filing
Over the last 12 months insiders sold $2 against $2 of open-market buying. Jacobs Ian Seth bought $2 in discretionary trades (Aug). Mark N.tompkins trimmed 5.8% → 5.6%. One red-flag 8-K in the window: Restatement (4.02), Apr 9, 2026.
Insider flow
1 buyer, $2 (1 lots) · 1 seller, $2 (1 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Jacobs Ian Seth | 1 | $2 | 0 | – | Aug 26, 2025 |
| Mark N. Tompkins | 0 | – | 1 | $2 | Aug 26, 2025 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| Muller Elizabeth | 20.6% | 13D | Sep 5, 2025 | filing ↗ | |
| Muller Richard | 10.6% | 13D | Sep 5, 2025 | filing ↗ | |
| Mark N.tompkins | 5.6% | 13G | May 15, 2026 | filing ↗ | |
| EE Holdings Limited | 5.5% | 13G | Nov 3, 2025 | filing ↗ | |
| Edward Eisler | 5.5% | 13G | Nov 3, 2025 | filing ↗ |
Planned insider sales (Form 144)
No sale notices filed in the last 12 months.
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Other events (8.01) | Jul 29, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jul 29, 2026 | filing ↗ |
| Officer/director changes (5.02) | Jul 17, 2026 | filing ↗ |
| Shareholder vote (5.07) | Jul 17, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jul 17, 2026 | filing ↗ |
| Other events (8.01) | Jun 22, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Apr 22, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Apr 22, 2026 | filing ↗ |
| Restatement (4.02) | Apr 9, 2026 | filing ↗ |
| Auditor change (4.01) | Feb 27, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 27, 2026 | filing ↗ |
| Officer/director changes (5.02) | Feb 18, 2026 | filing ↗ |
| Material agreement (1.01) | Feb 5, 2026 | filing ↗ |
| Unregistered equity sale (3.02) | Feb 5, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Feb 5, 2026 | filing ↗ |
| Other events (8.01) | Feb 5, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 5, 2026 | filing ↗ |
| Officer/director changes (5.02) | Dec 19, 2025 | filing ↗ |
| Other events (8.01) | Dec 19, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Dec 19, 2025 | filing ↗ |
| Officer/director changes (5.02) | Dec 9, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Dec 9, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Dec 4, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Dec 4, 2025 | filing ↗ |
| Material agreement (1.01) | Nov 17, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 17, 2025 | filing ↗ |
| Officer/director changes (5.02) | Nov 7, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 7, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Nov 6, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 6, 2025 | filing ↗ |