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( Mark One ) ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Fiscal Year Ended December 31 , 2020 or TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 0 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K Delaware ( State or other jurisdiction of incorporation or organization ) Title of each class : Common Stock , $ 0.001 par value For the transition period from 919 East Hillsdale Blvd. , Suite 250 , Foster City , CA ( Address of principal executive offices ) Large accelerated filer Non - accelerated filer to Commission File Number : 0-20859 GERON CORPORATION ( Exact name of registrant as specified in its charter ) 0 X Registrant's telephone number , including area code : ( 650 ) 473-7700 Securities registered pursuant to Section 12 ( b ) of the Act : Trading symbol ( s ) : GERN 75-2287752 ( I.R.S. Employer Identification No. ) 94404 ( Zip Code ) Securities registered pursuant to Section 12 ( g ) of the Act : None Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes No Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . Yes No > 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 of 1934 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 filing requirements for the past 90 days . Yes No Name of each exchange on which registered : The Nasdaq Stock Market LLC Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of 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 such files ) . Yes No Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company , or emerging growth company . See the definitions of “ large accelerated filer , ” “ accelerated filer , ” “ smaller reporting company , ” and “ emerging growth company ” in Rule 12b - 2 of the Exchange Act . Accelerated filer Smaller reporting company Emerging growth company If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) . Yes o No x DOCUMENTS INCORPORATED BY REFERENCE : The aggregate market value of voting and non - voting common equity held by non - affiliates of the registrant was approximately $ 516,434,000 based upon the closing price of the registrant's common stock on June 30 , 2020 on the Nasdaq Global Select Market . The calculation of the aggregate market value of voting and non - voting common equity held by non - affiliates of the registrant excludes shares of common stock held by each officer , director and stockholder that the registrant concluded were affiliates on that date . This determination of affiliate status is not necessarily a conclusive determination for other purposes . As of March 1 , 2021 , there were 318,527,540 shares of common stock outstanding . 0 冈 Document Portions of the Registrant's definitive proxy statement for the 2021 annual meeting of stockholders to be filed pursuant to Regulation 14A within 120 days of the Registrant's fiscal year ended December 31 , 2020 Form 10 - K Parts III