GERN
Geron Corporation
NASDAQ: GERN · HEALTHCARE · BIOTECHNOLOGY
$0.97
-15.78% today
Updated 2026-10-28
Market cap
$745.27M
P/E ratio
—
P/S ratio
3.64x
EPS (TTM)
$-0.10
Dividend yield
—
52W range
$1 – $2
Volume
10.6M
Geron Corporation (GERN) Insider transactions
Net insider activity
Net buying (38,883,099 shares)
Buy transactions
84
Sell transactions
16
All transactions
| Date | Insider | Title | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-09-30 | SPIEGEL, ROBERT J. | Director | Buy | 6,351 | $1.23 | $7811.73 |
| 2026-06-30 | SPIEGEL, ROBERT J. | Director | Buy | 6,103 | $1.28 | $7811.84 |
| 2026-05-20 | SPIEGEL, ROBERT J. | Director | Buy | 220,000 | — | — |
| 2026-05-20 | O'FARRELL, ELIZABETH G. | Director | Buy | 220,000 | — | — |
| 2026-05-20 | MOLINEAUX, SUSAN | Director | Buy | 220,000 | — | — |
| 2026-05-20 | MCDONALD, JOHN F | Director | Buy | 220,000 | — | — |
| 2026-05-20 | BIR, DAWN CARTER | Director | Buy | 220,000 | — | — |
| 2026-04-13 | WILLIAMS, TIMOTHY | EVP and Chief Legal Officer | Buy | 2,500,000 | — | — |
| 2026-03-31 | SPIEGEL, ROBERT J. | Director | Buy | 5,243 | $1.49 | $7812.07 |
| 2026-03-25 | CHINOPOROS, CONSTANTINE | Director | Buy | 270,000 | — | — |
| 2026-03-25 | ANDREWS, PATRICIA S | Director | Buy | 270,000 | — | — |
| 2026-02-18 | ROBERTSON, MICHELLE | EVP, CHIEF FINANCIAL OFFICER | Sale | 27,500 | — | — |
| 2026-02-18 | ROBERTSON, MICHELLE | EVP, CHIEF FINANCIAL OFFICER | Buy | 27,500 | — | — |
| 2026-02-18 | ROBERTSON, MICHELLE | EVP, CHIEF FINANCIAL OFFICER | Sale | 9,855 | $1.94 | $19118.70 |
| 2026-02-17 | ROBERTSON, MICHELLE | EVP, CHIEF FINANCIAL OFFICER | Buy | 1,660,000 | — | — |
| 2026-02-17 | EID, JOSEPH | EVP, R&D; Chief Medical Office | Buy | 2,220,000 | — | — |
| 2025-12-31 | SPIEGEL, ROBERT J. | Director | Buy | 5,918 | $1.32 | $7811.76 |
| 2025-10-20 | ELNAWAWI, AHMED | EVP, Chief Commercial Officer | Buy | 3,000,000 | — | — |
| 2025-09-30 | SPIEGEL, ROBERT J. | Director | Buy | 5,702 | $1.37 | $7811.74 |
| 2025-08-07 | SEMERJIAN, HAROUT | Director, President and CEO | Buy | 7,000,000 | — | — |
| 2025-08-07 | SEMERJIAN, HAROUT | Director, President and CEO | Buy | 4,000,000 | — | — |
| 2025-06-30 | SPIEGEL, ROBERT J. | Director | Buy | 5,540 | $1.41 | $7811.40 |
| 2025-05-21 | SPIEGEL, ROBERT J. | Director | Buy | 180,000 | — | — |
| 2025-05-21 | O'FARRELL, ELIZABETH G. | Director | Buy | 180,000 | — | — |
| 2025-05-21 | MOLINEAUX, SUSAN | Director | Buy | 180,000 | — | — |
| 2025-05-21 | MCDONALD, JOHN F | Director | Buy | 180,000 | — | — |
| 2025-05-21 | LAWLIS, V BRYAN | Director | Buy | 180,000 | — | — |
| 2025-05-21 | BIR, DAWN CARTER | Director, Interim President and CEO | Buy | 180,000 | — | — |
| 2025-05-21 | AGGARWAL, GAURAV | Director | Buy | 180,000 | — | — |
| 2025-05-09 | LAWLIS, V BRYAN | Director | Buy | 13,300 | $1.18 | $15667.40 |
| 2025-03-31 | SPIEGEL, ROBERT J. | Director | Buy | 4,913 | $1.59 | $7811.67 |
| 2025-02-27 | ZIEGLER, JAMES | EVP, Chief Commercial Officer | Buy | 100,000 | $1.60 | $160000.00 |
| 2025-02-27 | SCARLETT, JOHN A | Director, Chairman, President and CEO | Buy | 12,500 | $1.77 | $22062.50 |
| 2025-02-27 | SAMUELS, SCOTT ALAN | EVP, Chief Legal Officer | Buy | 15,000 | $1.61 | $24150.00 |
| 2025-02-18 | ZIEGLER, JAMES | EVP, Chief Commercial Officer | Buy | 529,000 | — | — |
| 2025-02-18 | ZIEGLER, JAMES | EVP, Chief Commercial Officer | Buy | 89,000 | — | — |
| 2025-02-18 | SCARLETT, JOHN A | Director, Chairman, President and CEO | Buy | 2,457,000 | — | — |
| 2025-02-18 | SCARLETT, JOHN A | Director, Chairman, President and CEO | Buy | 410,000 | — | — |
| 2025-02-18 | SAMUELS, SCOTT ALAN | EVP, Chief Legal Officer | Buy | 621,000 | — | — |
| 2025-02-18 | SAMUELS, SCOTT ALAN | EVP, Chief Legal Officer | Buy | 104,000 | — | — |
| 2025-02-18 | ROBERTSON, MICHELLE | EVP, Chief Financial Officer | Buy | 656,000 | — | — |
| 2025-02-18 | ROBERTSON, MICHELLE | EVP, Chief Financial Officer | Buy | 110,000 | — | — |
| 2025-02-18 | GRETHLEIN, ANDREW J | EVP, Chief Operating Officer | Buy | 839,000 | — | — |
| 2025-02-18 | GRETHLEIN, ANDREW J | EVP, Chief Operating Officer | Buy | 140,000 | — | — |
| 2024-12-31 | SPIEGEL, ROBERT J. | Director | Sale | 2,206 | — | — |
| 2024-11-11 | EID, JOSEPH | EVP, Research and Development | Sale | 2,500,000 | — | — |
| 2024-09-30 | SPIEGEL, ROBERT J. | Director | Sale | 1,767 | — | — |
| 2024-09-09 | ZIEGLER, JAMES | EVP, Chief Commercial Officer | Sale | 1,600,000 | — | — |
| 2024-07-08 | GRETHLEIN, ANDREW J | EVP, Chief Operating Officer | Sale | 452,804 | — | — |
| 2024-07-08 | GRETHLEIN, ANDREW J | EVP, Chief Operating Officer | Sale | 221,544 | — | — |
| 2024-07-08 | GRETHLEIN, ANDREW J | EVP, Chief Operating Officer | Buy | 674,348 | $1.72 | $1.16M |
| 2024-06-28 | SPIEGEL, ROBERT J. | Director | Sale | 1,916 | — | — |
| 2024-06-10 | KAPUR, ANIL | EVP, Corp Strategy & CCO | Sale | 421,875 | — | — |
| 2024-06-10 | KAPUR, ANIL | EVP, Corp Strategy & CCO | Buy | 421,875 | $1.06 | $447187.50 |
| 2024-06-10 | FELLER, FAYE | EVP, Chief Medical Officer | Sale | 155,400 | — | — |
| 2024-06-10 | FELLER, FAYE | EVP, Chief Medical Officer | Sale | 112,500 | — | — |
| 2024-06-10 | FELLER, FAYE | EVP, Chief Medical Officer | Sale | 20,000 | — | — |
| 2024-06-10 | FELLER, FAYE | EVP, Chief Medical Officer | Sale | 287,900 | $4.63 | $1.33M |
| 2024-06-10 | FELLER, FAYE | EVP, Chief Medical Officer | Buy | 155,400 | $1.30 | $201243.00 |
| 2024-06-10 | FELLER, FAYE | EVP, Chief Medical Officer | Buy | 112,500 | $1.06 | $119250.00 |
| 2024-06-10 | FELLER, FAYE | EVP, Chief Medical Officer | Buy | 20,000 | $1.06 | $21200.00 |
| 2024-06-06 | SCARLETT, JOHN A | Director, Chairman, President and CEO | Buy | 1,000,000 | — | — |
| 2024-06-06 | SAMUELS, SCOTT ALAN | EVP, Chief Legal Officer | Buy | 250,000 | — | — |
| 2024-06-06 | ROBERTSON, MICHELLE | EVP, Chief Financial Officer | Buy | 250,000 | — | — |
| 2024-06-06 | KAPUR, ANIL | EVP, Corp Strategy & CCO | Buy | 250,000 | — | — |
| 2024-06-06 | GRETHLEIN, ANDREW J | EVP, Chief Operating Officer | Buy | 452,804 | — | — |
| 2024-06-06 | FELLER, FAYE | EVP, Chief Medical Officer | Buy | 200,000 | — | — |
| 2024-06-06 | FELLER, FAYE | EVP, Chief Medical Officer | Buy | 50,000 | — | — |
| 2024-06-04 | SCARLETT, JOHN A | Director, Chairman, President and CEO | Sale | 600,000 | — | — |
| 2024-06-04 | SCARLETT, JOHN A | Director, Chairman, President and CEO | Buy | 600,000 | $2.54 | $1.52M |
| 2024-05-15 | LAWLIS, V BRYAN | Director | Sale | 35,000 | — | — |
| 2024-05-15 | LAWLIS, V BRYAN | Director | Buy | 35,000 | $1.94 | $67900.00 |
| 2024-05-09 | SPIEGEL, ROBERT J. | Director | Buy | 180,000 | — | — |
| 2024-05-09 | O'FARRELL, ELIZABETH G. | Director | Buy | 180,000 | — | — |
| 2024-05-09 | MOLINEAUX, SUSAN | Director | Buy | 180,000 | — | — |
| 2024-05-09 | MCDONALD, JOHN F | Director | Buy | 180,000 | — | — |
| 2024-05-09 | LAWLIS, V BRYAN | Director | Buy | 180,000 | — | — |
| 2024-05-09 | BIR, DAWN CARTER | Director | Buy | 180,000 | — | — |
| 2024-05-09 | AGGARWAL, GAURAV | Director | Buy | 180,000 | — | — |
| 2024-03-29 | SPIEGEL, ROBERT J. | Director | Buy | 2,462 | $3.30 | $8124.60 |
| 2024-02-14 | SCARLETT, JOHN A | Director, CHAIRMAN, PRESIDENT AND CEO | Buy | 3,000,000 | — | — |
| 2024-02-14 | SAMUELS, SCOTT ALAN | EVP & CHIEF LEGAL OFFICER | Buy | 850,000 | — | — |
| 2024-02-14 | ROBERTSON, MICHELLE | EVP, CHIEF FINANCIAL OFFICER | Buy | 850,000 | — | — |
| 2024-02-14 | KAPUR, ANIL | EVP, CORP STRATEGY & CCO | Buy | 750,000 | — | — |
| 2024-02-14 | GRETHLEIN, ANDREW J | EVP, CHIEF OPERATING OFFICER | Buy | 1,200,000 | — | — |
| 2024-02-14 | FELLER, FAYE | EVP, CHIEF MEDICAL OFFICER | Buy | 750,000 | — | — |
| 2023-12-29 | SPIEGEL, ROBERT J. | Director | Buy | 3,406 | — | — |
| 2023-12-29 | MOLINEAUX, SUSAN | Director | Buy | 6,220 | — | — |
| 2023-12-29 | AGGARWAL, GAURAV | Director | Buy | 1,970 | — | — |
| 2023-11-26 | AGGARWAL, GAURAV | Director | Buy | 200,000 | — | — |
| 2023-09-29 | SPIEGEL, ROBERT J. | Director | Buy | 3,390 | — | — |
| 2023-09-29 | MOLINEAUX, SUSAN | Director | Buy | 6,191 | — | — |
| 2023-09-25 | ROBERTSON, MICHELLE | EVP, Chief Financial Officer | Buy | 1,350,000 | — | — |
| 2023-08-24 | O'FARRELL, ELIZABETH G. | Director | Buy | 6,607 | $2.28 | $15063.96 |
| 2023-08-24 | O'FARRELL, ELIZABETH G. | Director | Buy | 6,579 | $2.28 | $15000.12 |
| 2023-08-15 | SCARLETT, JOHN A | Director, Chairman, President and CEO | Buy | 500,000 | — | — |
| 2023-08-15 | GRETHLEIN, ANDREW J | EVP, Chief Operating Officer | Buy | 221,544 | — | — |
| 2023-08-15 | FELLER, FAYE | EVP, Chief Medical Officer | Buy | 180,000 | — | — |
| 2023-08-15 | FELLER, FAYE | EVP, Chief Medical Officer | Buy | 20,000 | — | — |
| 2023-08-15 | BLOOM, OLIVIA KYUSUK | EVP, Chief Financial Officer | Buy | 250,000 | — | — |
Frequently asked questions
Are GERN insiders buying or selling?
Over the transactions on record, GERN insiders have been net buyers, with about $1.35M in stock sold across 16 sales, against 21 open-market purchases.
Does insider selling at GERN mean the stock will fall?
Not by itself. Most executive selling is pre-scheduled through 10b5-1 plans filed months in advance, and insiders sell for diversification, taxes, and liquidity far more often than out of any view on the price. Insider buying is the stronger signal, especially when several insiders buy around the same time, because there is usually only one reason to put personal cash into the stock.
Which GERN insiders are selling the most?
Recent selling is concentrated in a few names. FELLER, FAYE accounts for the largest share on record, with about $1.33M sold. Selling by one or two individuals matters less than broad selling across the whole leadership team, which is the pattern worth watching.