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Name and Title Action Taken Date of Action R ule 10b5-1* Non-Rule 10b5-1** Nature of Trading Arrangement Aggregate Number of Securities Duration of Trading Arrangement
−Removed: Scarlett, M.D.,
−Removed: Former Chairman of the Board, President and Chief Executive Officer
−Removed: (until March 10, 2025)
−Removed: Terminated February 27, 2025 X Sale 1,374,298 1
−Removed: July 12, 2024−
−Removed: July 11, 2025, or such earlier date on which all shares under the plan are sold.
−Removed: Susan Molineaux, Ph.D.
−Removed: Adopted March 14, 2025 X Sale 656,000 2
−Removed: March 14, 2025 −
−Removed: March 13, 2026 , or such earlier date on which all shares under the plan are sold.
+Added: Bryan Lawlis, Ph.D.
+Added: Adopted May 15, 2025 X Sale 406,000 1
+Added: May 15, 2025−
+Added: May 15, 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.
1 unchanged sentence
1 Consists of 406,000 shares subject to stock options previously granted by Geron to Dr.
−Removed: 2 Consists of 656,000 shares subject to stock options previously granted by Geron to Dr.
Incorporation by Reference
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Number Filing Filing Date File No.
−Removed: Non-Employee Director Compensation Policy, as amended *
−Removed: Offer Letter by and between the Registrant and Dawn C.
−Removed: Bir, effective March 17 , 2025 *
−Removed: Certification of Chief Executive Officer pursuant to Form of Rule 13a‑14(a), as adopted pursuant to Section 302(a) of the Sarbanes‑Oxley Act of 2002, dated May 7, 202 5 .
−Removed: 31.2+ Certification of Chief Financial Officer pursuant to Form of Rule 13a‑14(a), as adopted pursuant to Section 302(a) of the Sarbanes‑Oxley Act of 2002, dated May 7, 202 5 .
+Added: Geron Corporation 2018 Equity Incentive Plan, as amended.
+Added: Geron Corporation 2014 Employee Stock Purchase Plan, as amended.
+Added: Certification of Chief Executive Officer pursuant to Form of Rule 13a‑14(a), as adopted pursuant to Section 302(a) of the Sarbanes‑Oxley Act of 2002, dated August 6, 2025.
+Added: 31.2+ Certification of Chief Financial Officer pursuant to Form of Rule 13a‑14(a), as adopted pursuant to Section 302(a) of the Sarbanes‑Oxley Act of 2002, dated August 6, 2025.
32.1+ Certification of Chief Executive Officer pursuant to 18 U.S.C.
−Removed: Section 1350, as adopted pursuant to Section 906 of the Sarbanes‑Oxley Act of 2002, dated May 7 , 202 5 .**
+Added: Section 1350, as adopted pursuant to Section 906 of the Sarbanes‑Oxley Act of 2002, dated August 6, 2025.**
32.2+ Certification of Chief Financial Officer pursuant to 18 U.S.C.
−Removed: Section 1350, as adopted pursuant to Section 906 of the Sarbanes‑Oxley Act of 2002, dated May 7, 202 5 .**
−Removed: 101 The following materials from the Registrant’s March 31, 2025 Quarterly Report on Form 10-Q for the quarter ended March 31, 2025 formatted in Inline Extensible Business Reporting Language (iXBRL) include:
−Removed: (i) Condensed Consolidated Balance Sheets as of March 31, 2025 and December 31, 2024, (ii) Condensed Consolidated Statements of Operations and Comprehensive Loss for the three months ended March 31, 2025 and 2024, (iii) Condensed Consolidated Statements of Stockholders’ Equity for the three months ended March 31, 2025 and 2024, (iv) Condensed Consolidated Statements of Cash Flows for the three months ended March 31, 2025 and 2024 and (v) Notes to Condensed Consolidated Financial Statements.
+Added: Section 1350, as adopted pursuant to Section 906 of the Sarbanes‑Oxley Act of 2002, dated August 6, 2025.**
+Added: 101 The following materials from the Registrant’s June 30, 2025 Quarterly Report on Form 10-Q for the quarter ended June 30, 2025 formatted in Inline Extensible Business Reporting Language (iXBRL) include:
+Added: (i) Condensed Consolidated Balance Sheets as of June 30, 2025 and December 31, 2024, (ii) Condensed Consolidated Statements of Operations and Comprehensive Loss for the three and six months ended June 30, 2025 and 2024, (iii) Condensed Consolidated Statements of Stockholders’ Equity for the three and six months ended June 30, 2025 and 2024, (iv) Condensed Consolidated Statements of Cash Flows for the three and six months ended June 30, 2025 and 2024 and (v) Notes to Condensed Consolidated Financial Statements.
104 Cover Page Interactive Data File (embedded within the Inline XBRL document)
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GERON CORPORATION
+Added: August 6, 2025
/s/ MICHELLE ROBERTSON
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Compared sentence by sentence after normalising whitespace, quotation marks, case and digits, so re-formatting and restated figures do not read as changed language. Wording changes appear as one removal and one addition. The current filing and the prior one are authoritative.