As of April 17, 2026, Geron's top three insider holders are Robert J. Spiegel (Director, 199.71K shares), Robert J. Spiegel (Director, 199.71K shares), Susan Molineaux (Director, 130.53K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Robert J. Spiegel | - | 199,707 | 0 | 01 Apr, 2026 |
| Robert J. Spiegel | - | 199,707 | 0 | 01 Apr, 2026 |
| Susan Molineaux | - | 0 | 130,527 | 03 Jan, 2024 |
| Susan Molineaux | - | 0 | 124,307 | 02 Oct, 2023 |
| Karin Eastham | - | 109,047 | 0 | 17 Jan, 2023 |
| James Ziegler | Evp, Chief Commercial Officer | 100,000 | 0 | 03 Mar, 2025 |
| James Ziegler | Evp, Chief Commercial Officer | 100,000 | 0 | 03 Mar, 2025 |
| Olivia Kyusuk Bloom | Evp, Chief Financial Officer | 74,588 | 0 | 10 Feb, 2023 |
| Elizabeth G. O'Farrell | - | 7,407 | 26,220 | 24 Aug, 2023 |
| Elizabeth G. O'Farrell | - | 7,407 | 26,220 | 24 Aug, 2023 |
| Scott Alan Samuels | Evp, Chief Legal Officer | 26,682 | 0 | 03 Mar, 2025 |
| Scott Alan Samuels | Evp, Chief Legal Officer | 26,682 | 0 | 03 Mar, 2025 |
| Michelle Robertson | Evp, Chief Financial Officer | 17,645 | 0 | 19 Feb, 2026 |
| Michelle Robertson | Evp, Chief Financial Officer | 17,645 | 0 | 19 Feb, 2026 |
| V Bryan Lawlis | - | 13,300 | 0 | 13 May, 2025 |
| John A Scarlett | Chairman, President And Ceo | 12,500 | 0 | 03 Mar, 2025 |
| Gaurav Aggarwal | - | 1,970 | 0 | 03 Jan, 2024 |
* 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 |
| 31 Mar, 2026 | Robert J. Spiegel | Common Stock | A | 5,243 | $1.49 | 199,707 | D | A |
| 25 Mar, 2026 | Patricia S Andrews | Stock Option (Right to Buy) | A | 270,000 | $0.00 | 270,000 | D | A |
| 25 Mar, 2026 | Constantine Chinoporos | 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 | 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 |
| 21 May, 2025 | John F Mcdonald | Stock Option (right to buy) | A | 180,000 | $0.00 | 180,000 | D | A |
| 21 May, 2025 | Robert J. Spiegel | Stock Option (right to buy) | A | 180,000 | $0.00 | 180,000 | D | A |
| 21 May, 2025 | Elizabeth G. O'Farrell | Stock Option (right to buy) | A | 180,000 | $0.00 | 180,000 | D | A |
| 21 May, 2025 | Dawn Carter Bir | Stock Option (right to buy) | A | 180,000 | $0.00 | 180,000 | D | A |
| 21 May, 2025 | Gaurav Aggarwal | Stock Option (right to buy) | A | 180,000 | $0.00 | 180,000 | D | A |