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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 Form 10 - K ( 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 For the transition period from Commission file number : 001-36740 Delaware ( State or other jurisdiction of incorporation or organization ) 409 Illinois Street San Francisco , CA ( Address of principal executive offices ) FIBROGEN , INC . ( Exact name of registrant as specified in its charter ) DOO to Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class Common Stock , $ 0.01 par value Registrant's telephone number , including area code : ( 415 ) 978-1200 ( I.R.S. Employer Identification No. ) 77-0357827 Trading Symbol FGEN Securities registered pursuant to Section 12 ( g ) of the Act : None 94158 ( zip code ) Name of each exchange on which registered The NASDAQ Global Select Market No No ✔ Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes 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 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 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 an 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 : Large accelerated filer ■ Non - accelerated filer ■ 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 No The aggregate market value of the voting and non - voting common equity held by non - affiliates of the registrant , computed by reference to the closing price as of the last business day of the registrant's most recently completed second fiscal quarter , June 30 , 2020 , was approximately $ 2,127.6 million . Shares of Common Stock held by each executive officer and director and stockholders known by the registrant to own 10 % or more of the outstanding stock based on public filings and other information known to the registrant have been excluded since such persons may be deemed affiliates . This determination of affiliate status is not necessarily a conclusive determination for other purposes . The number of shares of common stock outstanding as of January 31 , 2021 was 91,560,468 . DOCUMENTS INCORPORATED BY REFERENCE Items 10 , 11 , 12 , 13 and 14 of Part III of this Annual Report on Form 10 - K incorporate information by reference from the definitive proxy statement for the registrant's 2021 Annual Meeting of Stockholders to be filed with the Securities and Exchange Commission pursuant to Regulation 14A not later than after 120 days after the end of the fiscal year covered by this Annual Report on Form 10 - K .