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Insider Trading Arrangements
 3 Months Ended
Mar. 31, 2025
shares
Trading Arrangements, by Individual  
Material Terms of Trading Arrangement
During the quarterly period covered by this report, the following directors and officers (as defined in Rule 16a-1(f) under the Exchange Act) adopted or terminated a "Rule 10b5-1 trading arrangement" or a "non-Rule 10b5-1 trading arrangement" (as such terms are defined in Item 408 of Regulation S-K) as set forth in the table below.
Character of Trading Arrangement
Name and TitleAction TakenDate of ActionRule 10b5-1*Non-Rule 10b5-1**Nature of Trading Arrangement Aggregate Number of SecuritiesDuration of Trading Arrangement
John A. Scarlett, M.D.,
Former Chairman of the Board, President and Chief Executive Officer
(until March 10, 2025)
TerminatedFebruary 27, 2025XSale
1,374,298 1
July 12, 2024−
July 11, 2025, or such earlier date on which all shares under the plan are sold.
Susan Molineaux, Ph.D.
Director
AdoptedMarch 14, 2025XSale
656,000 2
March 14, 2025 −
March 13, 2026, or such earlier date on which all shares under the plan are sold.
*Contract, instruction or written plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act.
**"Non-Rule 10b5-1 trading arrangement" as defined in Item 408(c) of Regulation S-K under the Exchange Act.
1Consists of 1,374,298 shares subject to stock options previously granted by Geron to Dr. Scarlett.
2Consists of 656,000 shares subject to stock options previously granted by Geron to Dr. Molineaux.
Non-Rule 10b5-1 Arrangement Adopted false
Non-Rule 10b5-1 Arrangement Terminated false
Susan Molineaux [Member]  
Trading Arrangements, by Individual  
Rule 10b5-1 Arrangement Adopted true
Adoption Date March 14, 2025
Expiration Date March 13, 2026
Arrangement Duration 364 days
Aggregate Available 656,000
John A. Scarlett [Member]  
Trading Arrangements, by Individual  
Rule 10b5-1 Arrangement Terminated true
Termination Date February 27, 2025
Aggregate Available 1,374,298