Over the past 12 months, Geron insiders sold $19,119 of stock on the open market (9.86K shares) and made no open-market purchases.
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Robert J. Spiegel | Director | 212,161 | 0 | 212,161 | 29.0% | 01 Oct, 2026 |
| 2 | Susan Molineaux | Director | 0 | 130,527 | 130,527 | 17.8% | 03 Jan, 2024 |
| 3 | Karin Eastham | Director | 109,047 | 0 | 109,047 | 14.9% | 17 Jan, 2023 |
| 4 | James Ziegler | Evp, Chief Commercial Officer | 100,000 | 0 | 100,000 | 13.7% | 03 Mar, 2025 |
| 5 | Olivia Kyusuk Bloom | Evp, Chief Financial Officer | 74,588 | 0 | 74,588 | 10.2% | 10 Feb, 2023 |
| 6 | Elizabeth G. O'Farrell | Director | 7,407 | 26,220 | 33,627 | 4.6% | 24 Aug, 2023 |
| 7 | Scott Alan Samuels | Evp, Chief Legal Officer | 26,682 | 0 | 26,682 | 3.6% | 03 Mar, 2025 |
| 8 | Michelle Robertson | Evp, Chief Financial Officer | 17,645 | 0 | 17,645 | 2.4% | 19 Feb, 2026 |
| 9 | V Bryan Lawlis | Director | 13,300 | 0 | 13,300 | 1.8% | 13 May, 2025 |
| 10 | John A Scarlett | Chairman, President And Ceo | 12,500 | 0 | 12,500 | 1.7% | 03 Mar, 2025 |
| 11 | Gaurav Aggarwal | Director | 1,970 | 0 | 1,970 | 0.3% | 03 Jan, 2024 |
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 |
|---|---|---|---|---|---|---|---|---|
| 30 Sep, 2026 | Robert J. Spiegel | Director | Acquired A | 6,351 | $1.23 | $7.81K | 212,161 | Direct |
| 30 Jun, 2026 | Robert J. Spiegel | Director | Acquired A | 6,103 | $1.28 | $7.81K | 205,810 | Direct |
| 20 May, 2026 | Robert J. Spiegel | Director | Acquired A | 220,000 | $0.00 | $0 | 220,000 | Direct |
| 20 May, 2026 | Susan Molineaux | Director | Acquired A | 220,000 | $0.00 | $0 | 220,000 | Direct |
| 20 May, 2026 | John F Mcdonald | Director | Acquired A | 220,000 | $0.00 | $0 | 220,000 | Direct |
| 20 May, 2026 | Dawn Carter Bir | Director | Acquired A | 220,000 | $0.00 | $0 | 220,000 | Direct |
| 20 May, 2026 | Elizabeth G. O'Farrell | Director | Acquired A | 220,000 | $0.00 | $0 | 220,000 | Direct |
| 13 Apr, 2026 | Timothy Williams | Evp And Chief Legal Officer | Acquired A | 2,500,000 | $0.00 | $0 | 2,500,000 | Direct |
| 31 Mar, 2026 | Robert J. Spiegel | Director | Acquired A | 5,243 | $1.49 | $7.81K | 199,707 | Direct |
| 25 Mar, 2026 | Patricia S Andrews | Director | Acquired A | 270,000 | $0.00 | $0 | 270,000 | Direct |
| 25 Mar, 2026 | Constantine Chinoporos | Director | Acquired A | 270,000 | $0.00 | $0 | 270,000 | Direct |
| 17 Feb, 2026 | Joseph Eid | Evp, Rd; Chief Medical Office | Acquired A | 2,220,000 | $0.00 | $0 | 2,220,000 | Direct |
| 18 Feb, 2026 | Michelle Robertson | Evp, Chief Financial Officer | Acquired M | 27,500 | $0.00 | $0 | 27,500 | Direct |
| 18 Feb, 2026 | Michelle Robertson | Evp, Chief Financial Officer | Disposed S | 9,855 | $1.94 | $19.12K | 17,645 | Direct |
| 17 Feb, 2026 | Michelle Robertson | Evp, Chief Financial Officer | Acquired A | 1,660,000 | $0.00 | $0 | 1,660,000 | Direct |
| 18 Feb, 2026 | Michelle Robertson | Evp, Chief Financial Officer | Disposed M | 27,500 | $0.00 | $0 | 82,500 | Direct |
| 31 Dec, 2025 | Robert J. Spiegel | Director | Acquired A | 5,918 | $1.32 | $7.81K | 194,464 | Direct |
| 20 Oct, 2025 | Ahmed Elnawawi | Evp, Chief Commercial Officer | Acquired A | 3,000,000 | $0.00 | $0 | 3,000,000 | Direct |
| 30 Sep, 2025 | Robert J. Spiegel | Director | Acquired A | 5,702 | $1.37 | $7.81K | 188,546 | Direct |
| 07 Aug, 2025 | Harout Semerjian | President And Ceo | Acquired A | 7,000,000 | $0.00 | $0 | 7,000,000 | Direct |