Cel Sci's top three insider shareholders as of March 23, 2026 are Geert R Kersten (Chief Executive Officer, 1.15Mn shares), Geert R Kersten (Chief Executive Officer, 120.81K shares), Daniel H Zimmerman (Senior Vice President, 120.23K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Geert R Kersten | Chief Executive Officer | 0 | 1,146,298 | 07 Jul, 2021 |
| Geert R Kersten | Chief Executive Officer | 120,815 | 0 | 26 Jan, 2026 |
| Daniel H Zimmerman | Senior Vice President | 120,226 | 0 | 03 Oct, 2022 |
| John Cipriano | Senior Vice President | 63,108 | 0 | 23 Apr, 2021 |
| Peter R Young | 28,914 | 0 | 29 Jun, 2021 | |
| Patricia B Prichep | Chief Financial Officer | 12,028 | 0 | 05 Jan, 2026 |
| Eyal Talor | Chief Scientific Officer | 6,264 | 0 | 05 Jan, 2026 |
| Bruno Jean-Marie Baillavoine | 5,973 | 0 | 07 Jul, 2021 | |
| Robert Eugene Watson | 3,733 | 0 | 29 Jul, 2025 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 22 Jan, 2026 | Geert R Kersten | Common Stock | A | 38,023 | $5.26 | 120,815 | D | P |
| 31 Dec, 2025 | Patricia B Prichep | Common Stock | A | 815 | $5.26 | 12,028 | D | A |
| 31 Dec, 2025 | Geert R Kersten | Common Stock | A | 998 | $5.26 | 82,792 | D | A |
| 31 Dec, 2025 | Eyal Talor | Common Stock | A | 456 | $5.26 | 6,264 | D | A |
| 04 Dec, 2025 | Geert R Kersten | Common Stock | A | 8,389 | $5.96 | 81,794 | D | P |
| 30 Sep, 2025 | Patricia B Prichep | Common Stock | A | 466 | $9.20 | 11,213 | D | A |
| 30 Sep, 2025 | Geert R Kersten | Common Stock | A | 570 | $9.20 | 73,405 | D | A |
| 30 Sep, 2025 | Eyal Talor | Common Stock | A | 260 | $9.20 | 5,808 | D | A |
| 28 Jul, 2025 | Eyal Talor | Options | A | 15,000 | $0.01 | 81,622 | D | A |
| 28 Jul, 2025 | Geert R Kersten | Options | A | 25,000 | $0.01 | 175,157 | D | A |
| 25 Jul, 2025 | Robert Eugene Watson | Common Stock | A | 2,919 | $6.85 | 3,733 | D | P |
| 28 Jul, 2025 | Patricia B Prichep | Options | A | 12,000 | $0.01 | 75,127 | D | A |
| 28 Jul, 2025 | Bruno Jean-Marie Baillavoine | Options | A | 4,000 | $0.01 | 28,017 | D | A |
| 28 Jul, 2025 | John Cipriano | Options | A | 7,500 | $0.01 | 38,008 | D | A |
| 28 Jul, 2025 | Robert Eugene Watson | Options | A | 4,000 | $0.01 | 27,266 | D | A |
| 25 Jul, 2025 | Geert R Kersten | Common Stock | A | 29,197 | $6.85 | 72,835 | D | P |
| 30 Jun, 2025 | Patricia B Prichep | Common Stock | A | 1,873 | $2.29 | 10,747 | D | A |
| 30 Jun, 2025 | Eyal Talor | Common Stock | A | 1,048 | $2.29 | 5,548 | D | A |
| 30 Jun, 2025 | Geert R Kersten | Common Stock | A | 2,292 | $2.29 | 43,638 | D | A |
| 31 Mar, 2025 | Geert R Kersten | Common Stock | A | 22,786 | $0.23 | 1,240,378 | D | A |