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(Mark One) xQUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period endedSeptember 30, 2025OR oTRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period fromto.Commission File Number:000-20859_________________________________________________________ GERON CORPORATION (Exact name of registrant as specified in its charter) Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filingrequirements for the past 90 days.YesxNoo Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit suchYesxNoo files). Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or anemerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule12b-2 of the Exchange Act. If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with anynew or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.oIndicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).Yeso No x Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date. TABLE OF CONTENTS PART I. FINANCIAL INFORMATION Item 1:Financial Statements (Unaudited)Condensed Consolidated Balance SheetsCondensed Consolidated Statements of OperationsCondensed Consolidated Statements of Comprehensive LossCondensed Consolidated Statements of Stockholders’ EquityCondensed Consolidated Statements of Cash FlowsNotes to Condensed Consolidated Financial StatementsItem 2:Management’s Discussion and Analysis of Financial Condition and Results of OperationsItem 3:Quantitative and Qualitative Disclosures About Market RiskItem 4:Controls and Procedures PART II. OTHER INFORMATION Item 1:Legal Proceedings39Item 1A:Risk Factors39Item 2:Unregistered Sales of Equity Securities, Use of Proceeds, and Issuer Purchases of Equity Securities92Item 3:Defaults Upon Senior Securities92Item 4:Mine Safety Disclosures92Item 5:Other Information92Item 6:Exhibits93SIGNATURES94 RYTELOand other trademarks or service marks of Geron Corporation appearing in this Quarterly Report on Form 10-Q (this "Report") are theproperty of Geron Corporation. This Report contains additional trade names, trademarks and service marks of others, which are the property of theirrespective owners. We do not intend our use or display of other companies’ trade names, trademarks or service marks to imply a relationship with, orendorsement or sponsorship of us by, these other companies.® GERON CORPORATIONCONDENSED CONSOLIDATED BALANCE SHEETS(IN THOUSANDS) GERON CORPORATIONCONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS(IN THOUSANDS)(UNAUDITED) GERON CORPORATIONCONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY(IN THOUSANDS, EXCEPT SHARE DATA)(UNAUDITED) GERON CORPORATIONCONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS(IN THOUSANDS)(UNAUDITED) GERON CORPORATIONNOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTSSEPTEMBER30, 2025(UNAUDITED) 1.BASIS OF PRESENTATION, PRINCIPLES OF CONSOLIDATION, USE OF ESTIMATES AND RECENT ACCOUNTINGPRONOUNCEMENTS Basis of Presentation The terms “Geron”, the “Company”, “we” and “us” as used in this Report refer to Geron Corporation and its wholly-ownedsubsidiaries, Geron UK Limited, or Geron UK, a United Kingdom company, and Geron Netherlands B.V., or Geron Netherlands, a Netherlandscompany. Geron UK was incorporated in September 2021, and its operations commenced in January 2022. Geron Netherlands was incorporated inFebruary 2023, and its operations commenced in June 2023. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally acceptedaccounting principles for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they donot include all of the information and footnotes required by United States, or U.S., generally accepted accounting principles, or GAAP, for completefinancial statements. In the opinion of management, all adjustments considered necessary for a fair presentation have been included. Operating resultsfor the three and nine months en