As of September 29, 2026, the three largest insider holders of FISN are Elizabeth Muller (President And Chief Executive, 10.25Mn shares), Richard Muller (Chief Technology Officer, 5.20Mn shares), Mark N. Tompkins (Other, 1.89Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Elizabeth Muller | Chief Executive Officer | 5,745,877 | 5,057,855 | 10,803,732 | 59.1% | 12 Dec, 2025 |
| 2 | Richard Muller | Chief Technology Officer | 5,196,426 | 0 | 5,196,426 | 28.4% | 09 Sep, 2025 |
| 3 | Mark N. Tompkins | Other | 1,891,667 | 0 | 1,891,667 | 10.4% | 08 Sep, 2025 |
| 4 | Ian Seth Jacobs | President, Ceo, Cfo, Secretary | 275,000 | 0 | 275,000 | 1.5% | 28 Aug, 2025 |
| 5 | William Mark Schmitz | Chief Financial Officer | 103,928 | 0 | 103,928 | 0.6% | 09 Sep, 2025 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 23 Jul, 2026 | Jonathon Angell | Director | Acquired A | 16,973 | $0.00 | $0 | 16,973 | Direct |
| 23 Jul, 2026 | Blake Janover | Director | Acquired A | 18,962 | $0.00 | $0 | 18,962 | Direct |
| 23 Jul, 2026 | Tepper Leslie Goldman | Director | Acquired A | 19,204 | $0.00 | $0 | 19,204 | Direct |
| 23 Jul, 2026 | Thomas S Glanville | Director | Acquired A | 19,156 | $0.00 | $0 | 19,156 | Direct |
| 09 Mar, 2026 | Tepper Leslie Goldman | Director | Acquired A | 3,334 | $0.00 | $0 | 103,334 | Direct |
| 09 Mar, 2026 | William Mark Schmitz | Chief Financial Officer | Acquired A | 223,000 | $0.00 | $0 | 223,980 | Direct |
| 09 Mar, 2026 | Mark Wayne Peres | Chief Nuclear Officer | Acquired A | 223,000 | $0.00 | $0 | 263,000 | Direct |
| 09 Mar, 2026 | Richard Muller | Chief Technology Officer | Acquired A | 223,000 | $0.00 | $0 | 872,363 | Direct |
| 09 Mar, 2026 | Jonathon Angell | Director | Acquired A | 3,334 | $0.00 | $0 | 103,334 | Direct |
| 09 Mar, 2026 | Michael Allen Brasel | Chief Operating Officer | Acquired A | 445,000 | $0.00 | $0 | 530,000 | Direct |
| 09 Mar, 2026 | Elizabeth Muller | Chief Executive Officer | Acquired A | 2,600,000 | $0.00 | $0 | 4,150,300 | Direct |
| 09 Mar, 2026 | Blake Janover | Director | Acquired A | 3,334 | $0.00 | $0 | 103,334 | Direct |
| 09 Mar, 2026 | Jonathan H Gordon | General Counsel | Acquired A | 223,000 | $0.00 | $0 | 328,000 | Direct |
| 09 Mar, 2026 | Thomas S Glanville | Director | Acquired A | 3,334 | $0.00 | $0 | 103,334 | Direct |
| 18 Feb, 2026 | Michael Allen Brasel | Officer | Acquired A | 15,000 | $0.00 | $0 | 15,000 | Direct |
| 18 Feb, 2026 | Jonathan H Gordon | Officer | Acquired A | 20,000 | $0.00 | $0 | 20,000 | Direct |
| 18 Feb, 2026 | William Mark Schmitz | Chief Financial Officer | Acquired A | 15,000 | $0.00 | $0 | 15,000 | Direct |
| 19 Feb, 2026 | Mark Wayne Peres | Chief Nuclear Officer | Acquired A | 25,000 | $0.00 | $0 | 25,000 | Direct |
| 19 Feb, 2026 | Mark Wayne Peres | Chief Nuclear Officer | Acquired A | 15,000 | $0.00 | $0 | 15,000 | Direct |
| 07 Nov, 2025 | Michael Allen Brasel | Officer | Acquired A | 70,000 | $0.00 | $0 | 70,000 | Direct |