There have been 50 recent insider transactions recorded for Geron Corporation (GERN), including 35 buys and 9 sells. Total insider buying was valued at $22.27M and total insider selling at $20.31M.
Notable insiders with recent activity include Spiegel Robert J., Andrews Patricia S, Chinoporos Constantine. Insider transactions can provide insights into how company leadership views the stock's valuation and future prospects.
Insider Transactions — GERN
| Date |
Name |
Role |
Transaction |
Shares |
Avg. Price |
Value |
Shares Owned |
| 2026-03-31 |
Spiegel Robert J. |
Director |
RSU Award |
5,243 |
$1.49 |
$7.81K |
199,707 |
| 2026-03-25 |
Andrews Patricia S |
Officer |
Unknown |
- |
- |
- |
- |
| 2026-03-25 |
Andrews Patricia S |
Director |
RSU Award |
270,000 |
$1.57 |
$423.9K |
270,000 |
| 2026-03-25 |
Chinoporos Constantine |
Officer |
Unknown |
- |
- |
- |
- |
| 2026-03-25 |
Chinoporos Constantine |
Director |
RSU Award |
270,000 |
$1.57 |
$423.9K |
270,000 |
| 2026-02-18 |
Robertson Michelle |
EVP, Chief Financial Officer |
Informative Sell |
9,855 |
$1.94 |
$19.12K |
17,645 |
| 2026-02-17 |
Robertson Michelle |
EVP, Chief Financial Officer |
RSU Award |
1,660,000 |
$1.80 |
$2.99M |
1,660,000 |
| 2026-02-17 |
Eid Joseph |
EVP, R&d; Chief Medical Office |
RSU Award |
2,220,000 |
$1.80 |
$4M |
2,220,000 |
| 2025-12-31 |
Spiegel Robert J. |
Director |
RSU Award |
5,918 |
$1.32 |
$7.81K |
194,464 |
| 2025-10-20 |
Elnawawi Ahmed |
EVP, Chief Commercial Officer |
Unknown |
- |
- |
- |
10,000 |
| 2025-10-20 |
Elnawawi Ahmed |
EVP, Chief Commercial Officer |
RSU Award |
3,000,000 |
$1.27 |
$3.81M |
3,000,000 |
| 2025-09-30 |
Spiegel Robert J. |
Director |
RSU Award |
5,702 |
$1.37 |
$7.81K |
188,546 |
| 2025-08-07 |
Semerjian Harout |
President and CEO |
Unknown |
- |
- |
- |
- |
| 2025-08-07 |
Semerjian Harout |
President and CEO |
RSU Award |
4,000,000 |
$1.30 |
$5.2M |
4,000,000 |
| 2025-06-30 |
Spiegel Robert J. |
Director |
RSU Award |
5,540 |
$1.41 |
$7.81K |
182,844 |
| 2025-05-21 |
Lawlis V Bryan |
Director |
RSU Award |
180,000 |
$1.34 |
$241.2K |
180,000 |
| 2025-05-21 |
Spiegel Robert J. |
Director |
RSU Award |
180,000 |
$1.34 |
$241.2K |
180,000 |
| 2025-05-21 |
Aggarwal Gaurav |
Director |
RSU Award |
180,000 |
$1.34 |
$241.2K |
180,000 |
| 2025-05-21 |
Molineaux Susan |
Director |
RSU Award |
180,000 |
$1.34 |
$241.2K |
180,000 |
| 2025-05-21 |
Bir Dawn Carter |
Interim President and CEO |
RSU Award |
180,000 |
$1.34 |
$241.2K |
180,000 |
| 2025-05-21 |
O'farrell Elizabeth G. |
Director |
RSU Award |
180,000 |
$1.34 |
$241.2K |
180,000 |
| 2025-05-21 |
Mcdonald John F |
Director |
RSU Award |
180,000 |
$1.34 |
$241.2K |
180,000 |
| 2025-05-09 |
Lawlis V Bryan |
Director |
Informative Buy |
13,300 |
$1.18 |
$15.67K |
13,300 |
| 2025-03-31 |
Spiegel Robert J. |
Director |
RSU Award |
4,913 |
$1.59 |
$7.81K |
177,304 |
| 2025-02-27 |
Scarlett John A |
Chairman, President and CEO |
Informative Buy |
12,500 |
$1.77 |
$22.06K |
12,500 |
| 2025-02-27 |
Samuels Scott Alan |
EVP, Chief Legal Officer |
Informative Buy |
15,000 |
$1.61 |
$24.15K |
26,682 |
| 2025-02-27 |
Ziegler James |
EVP, Chief Commercial Officer |
Informative Buy |
100,000 |
$1.60 |
$160K |
100,000 |
| 2025-02-18 |
Grethlein Andrew J |
EVP, Chief Operating Officer |
RSU Award |
140,000 |
- |
- |
140,000 |
| 2025-02-18 |
Scarlett John A |
Chairman, President and CEO |
RSU Award |
410,000 |
- |
- |
410,000 |
| 2025-02-18 |
Robertson Michelle |
EVP, Chief Financial Officer |
RSU Award |
110,000 |
- |
- |
110,000 |
| 2025-02-18 |
Samuels Scott Alan |
EVP, Chief Legal Officer |
RSU Award |
104,000 |
- |
- |
104,000 |
| 2025-02-18 |
Ziegler James |
EVP, Chief Commercial Officer |
RSU Award |
89,000 |
- |
- |
89,000 |
| 2024-12-31 |
Spiegel Robert J. |
Director |
RSU Award (Return) |
2,206 |
- |
- |
172,391 |
| 2024-12-31 |
Spiegel Robert J. |
Director |
RSU Award |
2,206 |
$3.54 |
$7.81K |
172,391 |
| 2024-11-11 |
Eid Joseph |
Officer |
Unknown |
- |
- |
- |
- |
| 2024-11-11 |
Eid Joseph |
EVP, Research and Development |
RSU Award (Return) |
2,500,000 |
$4.12 |
$10.3M |
2,500,000 |
| 2024-09-30 |
Spiegel Robert J. |
Director |
RSU Award (Return) |
1,767 |
- |
- |
170,185 |
| 2024-09-30 |
Spiegel Robert J. |
Director |
RSU Award |
1,767 |
$4.54 |
$8.02K |
170,185 |
| 2024-09-09 |
Ziegler James |
Officer |
Unknown |
- |
- |
- |
- |
| 2024-09-09 |
Ziegler James |
EVP, Chief Commercial Officer |
RSU Award (Return) |
1,600,000 |
$4.41 |
$7.06M |
1,600,000 |
| 2024-07-08 |
Grethlein Andrew J |
EVP, Chief Operating Officer |
Option Exercise (Sell) |
452,804 |
$1.72 |
$778.82K |
- |
| 2024-06-28 |
Spiegel Robert J. |
Director |
RSU Award |
1,916 |
$4.24 |
$8.12K |
168,418 |
| 2024-06-28 |
Spiegel Robert J. |
Director |
RSU Award (Return) |
1,916 |
- |
- |
168,418 |
| 2024-06-10 |
Kapur Anil |
EVP, Corp Strategy & Cco |
Informative Sell |
421,875 |
$4.65 |
$1.96M |
- |
| 2024-06-10 |
Feller Faye |
EVP, Chief Medical Officer |
Option Exercise (Sell) |
155,400 |
$1.30 |
$201.24K |
- |
| 2024-06-06 |
Grethlein Andrew J |
EVP, Chief Operating Officer |
RSU Award |
452,804 |
$1.72 |
$778.82K |
452,804 |
| 2024-06-06 |
Scarlett John A |
Chairman, President and CEO |
RSU Award |
1,000,000 |
$1.72 |
$1.72M |
1,000,000 |
| 2024-06-06 |
Kapur Anil |
EVP, Corp Strategy & Cco |
RSU Award |
250,000 |
$1.43 |
$357.5K |
250,000 |
| 2024-06-06 |
Robertson Michelle |
EVP, Chief Financial Officer |
RSU Award |
250,000 |
$2.17 |
$542.5K |
250,000 |
| 2024-06-06 |
Feller Faye |
EVP, Chief Medical Officer |
RSU Award |
50,000 |
$1.06 |
$53K |
50,000 |
■ Informative Buy/Sell — open market transaction (most significant)
■ Uninformative Buy — award, option exercise, conversion
■ Uninformative Sell — tax withholding, award vest sale
■ Neutral — gift, trust, expiry
