Geron Corp
A biopharmaceutical company making treatments for blood cancers and bone marrow disorders, Geron's approved drug RYTELO is given to adults with myelodysplastic syndromes who need blood transfusions. Founded in 1990 by biogerontologist Michael West, the name comes from the Greek word "geron," meaning "elder," reflecting an original focus on the biology of aging. Its work builds on Nobel Prize-winning research into telomeres, chromosome caps often called a "molecular clock."
Granted 897.6K · Sold 117.4K
Granted 1.06M · Sold 1.06M
Granted 656.6K · Sold 86.0K
Granted 915.7K · Sold 114.0K
Granted 584.7K · Sold 115.2K
Granted 318.8K
Granted 350.0K · Sold 34.8K
Granted 165.5K · Sold 35.0K
Granted 424.7K · Sold 175.0K
Granted 243.6K · Sold 99.7K
Granted 229.4K
Granted 164.1K · Bought 114.3K
Granted 219.3K
Granted 1.94M · Bought 137.5K · Sold 1.94M
Granted 462.8K · Sold 32.0K
Granted 1.36M · Sold 1.36M
Granted 159.0K
Bought 100.0K
Granted 12.7K
Granted 106.2K · Sold 48.6K
Granted 501.0K · Sold 432.4K
Granted 82.1K
Granted 120.3K
Granted 51.3K · Bought 142.8K
Granted 67.5K · Sold 7.5K
Bought 33.6K
Granted 27.5K · Sold 9.9K
Bought 15.0K
Granted 146.6K · Sold 70.0K
Granted 180.0K
Granted 287.9K · Sold 287.9K
Granted 70.0K · Bought 13.3K · Sold 70.0K
Granted 2.0K
Granted 448.5K · Sold 421.9K
Granted 531.1K · Sold 302.5K
| Insider | Stake change | Holds now | Granted / vested | Bought | Sold |
|---|---|---|---|---|---|
| Greenwood DavidPresident, Interim CEO, CFO, Director · 38 transactions | — | 782.6Kas of Feb 2012 | 897.6K | — | 117.4K |
| Grethlein Andrew JEVP, Chief Operating Officer · 7 transactions | — | 674.3Kas of Jul 2024 | 1.06M | — | 1.06M |
| Lebkowski JaneSVP, Chief Scientific Officer · 31 transactions | — | 606.9Kas of Feb 2012 | 656.6K | — | 86.0K |
| Okarma ThomasPresident and CEO · 20 transactions | — | 572.1Kas of Jul 2010 | 915.7K | — | 114.0K |
| Earp DavidSVP, Corp Transactions · 32 transactions | — | 498.0Kas of May 2012 | 584.7K | — | 115.2K |
| Barkas Alexander EDirector · 23 transactions | — | 348.1Kas of May 2011 | 318.8K | — | — |
| Spink Katharine E.SVP Alliance Mgmt & Operations · 17 transactions | — | 344.4Kas of Feb 2012 | 350.0K | — | 34.8K |
| Molineaux SusanDirector · 27 transactions | — | 289.8Kas of Dec 2023 | 165.5K | — | 35.0K |
| Spiegel Robert J.Director · 70 transactions | — | 199.7K | 424.7K | — | 175.0K |
| Harley CalvinVP, CSO Telomerase Tech · 25 transactions | — | 198.7Kas of May 2009 | 243.6K | — | 99.7K |
| Fritzky Edward VDirector · 28 transactions | — | 186.5Kas of May 2013 | 229.4K | — | — |
| Kiley ThomasDirector · 25 transactions | — | 171.9Kas of May 2013 | 164.1K | 114.3K | — |
| Huh HoyoungDirector · 20 transactions | — | 154.3Kas of Dec 2017 | 219.3K | — | — |
| Scarlett John AChairman, President and CEO, Director · 11 transactions | — | 137.5Kas of Mar 2025 | 1.94M | 137.5K | 1.94M |
| Kelsey Stephen MichaelEVP, R&D, Chief Med Officer · 17 transactions | — | 125.9Kas of May 2013 | 462.8K | — | 32.0K |
| Rosenfield StephenEVP, Genl Counsel & Secretary · 14 transactions | — | 112.5Kas of Aug 2018 | 1.36M | — | 1.36M |
| Eastham KarinDirector · 17 transactions | — | 109.0Kas of Jan 2023 | 159.0K | — | — |
| Ziegler JamesEVP, Chief Commercial Officer · 1 transaction | — | 100.0Kas of Feb 2025 | — | 100.0K | — |
| Colowick AlanPresident, Oncology · 4 transactions | — | 92.8Kas of Jan 2008 | 12.7K | — | — |
| Walker John PeterDirector · 11 transactions | — | 87.7Kas of Jan 2009 | 106.2K | — | 48.6K |
| Bloom Olivia KyusukEVP, Chief Financial Officer · 19 transactions | — | 74.6Kas of Feb 2023 | 501.0K | — | 432.4K |
| Zenner Patrick JDirector · 9 transactions | — | 73.7Kas of May 2010 | 82.1K | — | — |
| Homcy Charles JDirector · 15 transactions | — | 62.8Kas of May 2011 | 120.3K | — | — |
| Bradbury DanielDirector · 8 transactions | — | 51.3Kas of Mar 2019 | 51.3K | 142.8K | — |
| Benedetti Fabio MSVP, Chief Med Off, Oncology · 7 transactions | — | 41.0Kas of May 2009 | 67.5K | — | 7.5K |
| O'Farrell Elizabeth G.Director · 5 transactions | — | 33.6Kas of Aug 2023 | — | 33.6K | — |
| Robertson MichelleEVP, CHIEF FINANCIAL OFFICER · 2 transactions | — | 27.5K | 27.5K | — | 9.9K |
| Samuels Scott AlanEVP, Chief Legal Officer · 1 transaction | — | 26.7Kas of Feb 2025 | — | 15.0K | — |
| Hofstaetter ThomasDirector · 17 transactions | — | 26.6Kas of Mar 2015 | 146.6K | — | 70.0K |
| Nallicheri Melanie ISVP Corp Dev · 6 transactions | — | 25.0Kas of Feb 2012 | 180.0K | — | — |
| Feller FayeEVP, Chief Medical Officer · 4 transactions | — | 20.0Kas of Jun 2024 | 287.9K | — | 287.9K |
| Lawlis V BryanDirector · 5 transactions | — | 13.3Kas of May 2025 | 70.0K | 13.3K | 70.0K |
| Aggarwal GauravDirector · 1 transaction | — | 2.0Kas of Dec 2023 | 2.0K | — | — |
| Kapur AnilEVP, Corp Strategy & CCO · 5 transactions | — | 0as of Jun 2024 | 448.5K | — | 421.9K |
| Behrs Melissa KellyEVP, Chief Business Officer · 42 transactions | — | 0as of Apr 2019 | 531.1K | — | 302.5K |
Select a row to see that insider’s individual transactions. Sum of the holdings confirmed in the 12 months before this insider's last filing. A Form 4 reports a holding per line — held directly, or through a named trust, partnership or foundation, and in each share class separately — never a person’s total. Lines not restated in that time are left out and shown apart: an active filer restates what they still hold, so a line they did not restate is more often an entity since renamed, whose shares a successor line reports too. An amber marker means some were left out.
Net open-market activity over all recorded history: -6.26M shares. Grants, option exercises and tax withholding are excluded — they are compensation mechanics, not decisions to buy or sell.