According to recent filings covering the 90 days ending January 10, 2026, the three most significant insider holders at Geron are Director Robert J. Spiegel (194.46K shares), Director Susan Molineaux (130.53K shares), Director Karin Eastham (109.05K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Robert J. Spiegel | 194,464 | 05 Jan, 2026 | |
| Susan Molineaux | 130,527 | 01 May, 2023 | |
| Karin Eastham | 109,047 | 17 Jan, 2023 | |
| James Ziegler | Evp And Chief Commercial Officer | 100,000 | 03 Mar, 2025 |
| Olivia Kyusuk Bloom | Evp And Chief Financial Officer | 74,588 | 10 Feb, 2023 |
| Elizabeth G. O'Farrell | 33,627 | 24 Aug, 2023 | |
| Scott Alan Samuels | Evp And Chief Legal Officer | 26,682 | 03 Mar, 2025 |
| V Bryan Lawlis | 13,300 | 13 May, 2025 | |
| John A Scarlett | Chairman And President And Ceo | 12,500 | 03 Mar, 2025 |
| Gaurav Aggarwal | 1,970 | 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 |
|---|---|---|---|---|---|---|---|---|
| 31 Dec, 2025 | Robert J. Spiegel | Common Stock | A | 5,918 | $1.32 | 194,464 | D | A |
| 30 Sep, 2025 | Robert J. Spiegel | Common Stock | A | 5,702 | $1.37 | 188,546 | D | A |
| 30 Jun, 2025 | Robert J. Spiegel | Common Stock | A | 5,540 | $1.41 | 182,844 | D | A |
| 09 May, 2025 | V Bryan Lawlis | - | - | 13,300 | D | |||
| 09 May, 2025 | V Bryan Lawlis | Common Stock | A | 13,300 | $1.18 | 13,300 | D | P |
| 31 Mar, 2025 | Robert J. Spiegel | Common Stock | A | 4,913 | $1.59 | 177,304 | D | A |
| 27 Feb, 2025 | John A Scarlett | Common Stock | A | 12,500 | $1.76 | 12,500 | D | P |
| 27 Feb, 2025 | Scott Alan Samuels | - | - | 26,682 | D | |||
| 27 Feb, 2025 | Scott Alan Samuels | Common Stock | A | 15,000 | $1.61 | 26,682 | D | P |
| 27 Feb, 2025 | James Ziegler | Common Stock | A | 100,000 | $1.60 | 100,000 | D | P |
| 31 Dec, 2024 | Robert J. Spiegel | Common Stock | D | 2,206 | $0.00 | 172,391 | D | A |
| 30 Sep, 2024 | Robert J. Spiegel | Common Stock | D | 1,767 | $0.00 | 170,185 | D | A |
| 08 Jul, 2024 | Andrew J Grethlein | - | - | 0 | D | |||
| 08 Jul, 2024 | Andrew J Grethlein | Common Stock | D | 674,348 | $4.56 | 0 | D | S |
| 08 Jul, 2024 | Andrew J Grethlein | Common Stock | A | 674,348 | $1.72 | 674,348 | D | M |
| 08 Jul, 2024 | Andrew J Grethlein | - | - | 674,348 | D | |||
| 10 Jun, 2024 | Anil Kapur | Common Stock | A | 421,875 | $1.06 | 421,875 | D | M |
| 10 Jun, 2024 | Anil Kapur | Common Stock | D | 421,875 | $4.64 | 0 | D | S |
| 10 Jun, 2024 | Anil Kapur | - | - | 0 | D | |||
| 10 Jun, 2024 | Anil Kapur | - | - | 421,875 | D |