Geron's three largest insider shareholders as of June 09, 2026 are Robert J. Spiegel (Director, 199.71K shares), Karin Eastham (Director, 109.05K shares), James Ziegler (Evp, Chief Commercial Officer, 100.00K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Karin Eastham | - | 109,047 | 0 | 17 Jan, 2023 |
| Robert J. Spiegel | - | 199,707 | 0 | 01 Apr, 2026 |
| Olivia Kyusuk Bloom | Evp, Chief Financial Officer | 74,588 | 0 | 10 Feb, 2023 |
| Gaurav Aggarwal | - | 1,970 | 0 | 03 Jan, 2024 |
| Elizabeth G. O'Farrell | - | 7,407 | 26,220 | 24 Aug, 2023 |
| Michelle Robertson | Evp, Chief Financial Officer | 17,645 | 0 | 19 Feb, 2026 |
| Scott Alan Samuels | Evp, Chief Legal Officer | 26,682 | 0 | 03 Mar, 2025 |
| James Ziegler | Evp, Chief Commercial Officer | 100,000 | 0 | 03 Mar, 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 |
|---|---|---|---|---|---|---|---|---|
| 13 Apr, 2026 | Timothy Williams | Stock Option (Right to Buy) | A | 2,500,000 | $0.00 | 2,500,000 | D | A |
| 13 Apr, 2026 | Timothy Williams | Stock Option (Right to Buy) | A | 2,500,000 | $0.00 | 2,500,000 | D | A |
| 31 Mar, 2026 | Robert J. Spiegel | Common Stock | A | 5,243 | $1.49 | 199,707 | D | A |
| 25 Mar, 2026 | Constantine Chinoporos | Stock Option (Right to Buy) | A | 270,000 | $0.00 | 270,000 | D | A |
| 25 Mar, 2026 | Patricia S Andrews | Stock Option (Right to Buy) | A | 270,000 | $0.00 | 270,000 | D | A |
| 18 Feb, 2026 | Michelle Robertson | Common Stock | A | 27,500 | $0.00 | 27,500 | D | M |
| 17 Feb, 2026 | Joseph Eid | Stock Option (Right to Buy) | A | 2,220,000 | $0.00 | 2,220,000 | D | A |
| 18 Feb, 2026 | Michelle Robertson | Common Stock | D | 9,855 | $1.94 | 17,645 | D | S |
| 17 Feb, 2026 | Michelle Robertson | Stock Option (Right to Buy) | A | 1,660,000 | $0.00 | 1,660,000 | D | A |
| 18 Feb, 2026 | Michelle Robertson | Restricted Stock Units | D | 27,500 | $0.00 | 82,500 | D | M |
| 31 Dec, 2025 | Robert J. Spiegel | Common Stock | A | 5,918 | $1.32 | 194,464 | D | A |
| 20 Oct, 2025 | Ahmed Elnawawi | Stock Option (right to buy) | A | 3,000,000 | $0.00 | 3,000,000 | D | A |
| 30 Sep, 2025 | Robert J. Spiegel | Common Stock | A | 5,702 | $1.37 | 188,546 | D | A |
| 07 Aug, 2025 | Harout Semerjian | Stock Option (right to buy) | A | 7,000,000 | $0.00 | 7,000,000 | D | A |
| 07 Aug, 2025 | Harout Semerjian | Stock Option (right to buy) | A | 7,000,000 | $0.00 | 7,000,000 | D | A |
| 07 Aug, 2025 | Harout Semerjian | Stock Option (right to buy) | A | 7,000,000 | $0.00 | 7,000,000 | D | A |
| 07 Aug, 2025 | Harout Semerjian | Stock Option (right to buy) | A | 4,000,000 | $0.00 | 4,000,000 | D | A |
| 07 Aug, 2025 | Harout Semerjian | Stock Option (right to buy) | A | 4,000,000 | $0.00 | 4,000,000 | D | A |
| 07 Aug, 2025 | Harout Semerjian | Stock Option (right to buy) | A | 4,000,000 | $0.00 | 4,000,000 | D | A |
| 30 Jun, 2025 | Robert J. Spiegel | Common Stock | A | 5,540 | $1.41 | 182,844 | D | A |