Geron Corporation (GERN) has 20 known insider and institutional holders on record. The largest holder is Semerjian Harout with 4,000,000 shares. Other notable holders include Eid Joseph and ROBERTSON MICHELLE.
Over the last 12 months, insiders have made 23 transactions in GERN stock — 18 buys (valued at $18.58M) and 1 sells (valued at $19.12K). Insider buying has outpaced selling during this period, which may signal confidence in the company's prospects.
GERN Insider Ownership
Top Holder
Semerjian Harout
4,000,000 shares
Buys (12 mo)
18
$18.58M value
Sells (12 mo)
1
$19.12K value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Semerjian Harout |
President and CEO |
4,000,000 |
2025-08-08 |
|
| 2 |
Eid Joseph |
EVP, R&d; Chief Medical Office |
2,220,000 |
2026-02-19 |
|
| 3 |
Robertson Michelle |
EVP, Chief Financial Officer |
1,660,000 |
2026-02-19 |
|
| 4 |
Rizo Aleksandra |
EVP, Chief Medical Officer |
750,000 |
2022-02-18 |
|
| 5 |
Rosenfield Stephen |
EVP, Chief Legal Off & Sec |
750,000 |
2022-02-18 |
|
| 6 |
Okarma Thomas |
President and CEO |
504,560 |
2010-07-13 |
|
| 7 |
Earp David |
SVP, Corp Transactions |
467,406 |
2012-06-01 |
|
| 8 |
Parker Craig C |
EVP, Corp Dev & Sci Affairs |
400,000 |
2014-02-12 |
|
| 9 |
Barkas Alexander E |
Director |
348,122 |
2011-05-24 |
|
| 10 |
Behrs Melissa Kelly |
EVP, Chief Business Officer |
300,000 |
2021-02-04 |
|
| 11 |
Andrews Patricia S |
Director |
270,000 |
2026-03-26 |
|
| 12 |
Chinoporos Constantine |
Director |
270,000 |
2026-03-26 |
|
| 13 |
Kapur Anil |
EVP, Corp Strategy & Cco |
250,000 |
2024-06-07 |
|
| 14 |
Bloom Olivia Kyusuk |
EVP, Chief Financial Officer |
250,000 |
2023-09-21 |
|
| 15 |
Kelly Melissa |
VP, Oncology |
246,096 |
2005-08-01 |
|
| 16 |
Cooper Graham K |
EVP, Bus Dev & CFO |
200,000 |
2012-05-18 |
|
| 17 |
Spiegel Robert J. |
Director |
199,707 |
2026-04-01 |
|
| 18 |
Fritzky Edward V |
Director |
186,511 |
2013-05-24 |
|
| 19 |
Molineaux Susan |
Director |
180,000 |
2025-05-22 |
|
| 20 |
Lawlis V Bryan |
Director |
180,000 |
2025-05-22 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2026-03-31 |
Spiegel Robert J. |
Director |
RSU Award |
5,243 |
$1.49 |
$7.81K |
| 2026-03-25 |
Chinoporos Constantine |
Director |
RSU Award |
270,000 |
$1.57 |
$423.9K |
| 2026-03-25 |
Chinoporos Constantine |
Officer |
Unknown |
- |
- |
- |
| 2026-03-25 |
Andrews Patricia S |
Director |
RSU Award |
270,000 |
$1.57 |
$423.9K |
| 2026-03-25 |
Andrews Patricia S |
Officer |
Unknown |
- |
- |
- |
| 2026-02-17 |
Eid Joseph |
EVP, R&d; Chief Medical Office |
RSU Award |
2,220,000 |
$1.80 |
$4M |
| 2026-02-18 |
Robertson Michelle |
EVP, Chief Financial Officer |
Informative Sell |
9,855 |
$1.94 |
$19.12K |
| 2026-02-17 |
Robertson Michelle |
EVP, Chief Financial Officer |
RSU Award |
1,660,000 |
$1.80 |
$2.99M |
| 2025-12-31 |
Spiegel Robert J. |
Director |
RSU Award |
5,918 |
$1.32 |
$7.81K |
| 2025-10-20 |
Elnawawi Ahmed |
EVP, Chief Commercial Officer |
RSU Award |
3,000,000 |
$1.27 |
$3.81M |
| 2025-10-20 |
Elnawawi Ahmed |
EVP, Chief Commercial Officer |
Unknown |
- |
- |
- |
| 2025-09-30 |
Spiegel Robert J. |
Director |
RSU Award |
5,702 |
$1.37 |
$7.81K |
| 2025-08-07 |
Semerjian Harout |
President and CEO |
RSU Award |
4,000,000 |
$1.30 |
$5.2M |
| 2025-08-07 |
Semerjian Harout |
President and CEO |
Unknown |
- |
- |
- |
| 2025-06-30 |
Spiegel Robert J. |
Director |
RSU Award |
5,540 |
$1.41 |
$7.81K |
| 2025-05-21 |
Mcdonald John F |
Director |
RSU Award |
180,000 |
$1.34 |
$241.2K |
| 2025-05-21 |
O'farrell Elizabeth G. |
Director |
RSU Award |
180,000 |
$1.34 |
$241.2K |
| 2025-05-21 |
Bir Dawn Carter |
Interim President and CEO |
RSU Award |
180,000 |
$1.34 |
$241.2K |
| 2025-05-21 |
Molineaux Susan |
Director |
RSU Award |
180,000 |
$1.34 |
$241.2K |
| 2025-05-21 |
Aggarwal Gaurav |
Director |
RSU Award |
180,000 |
$1.34 |
$241.2K |
| 2025-05-21 |
Spiegel Robert J. |
Director |
RSU Award |
180,000 |
$1.34 |
$241.2K |
| 2025-05-21 |
Lawlis V Bryan |
Director |
RSU Award |
180,000 |
$1.34 |
$241.2K |
| 2025-05-09 |
Lawlis V Bryan |
Director |
Informative Buy |
13,300 |
$1.18 |
$15.67K |
