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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 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number : 001-34207 Dynavax Technologies Corporation ( Exact name of registrant as specified in its charter ) Delaware ( State or other jurisdiction of incorporation or organization ) 2100 Powell Street , Suite 900 Emeryville , CA 94608 ( 510 ) 848-5100 ( Address , including Zip Code , and telephone number , including area code , of the registrant's principal executive offices ) Securities registered pursuant to Section 12 ( b ) of the Act : Trading symbol ( s ) : DVAX Securities Registered Pursuant to Section 12 ( g ) of the Act : None Title of each class : Common Stock , $ 0.001 par value 33-0728374 ( IRS Employer Identification No. ) Name of each exchange on which registered : The Nasdaq Stock Market LLC 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 Accelerated filer No 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 registration 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 . Smaller reporting company Large accelerated filer > Emerging growth company Non - accelerated filer 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 . Î 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 stock held by non - affiliates of the registrant , based upon the closing sale price of the common stock on June 30 , 2020 as reported on the Nasdaq Capital Market , was approximately $ 884.4 million . Shares of common stock held by each officer and director and by each person known to the Company who owns 5 % or more of the outstanding common stock have been excluded in that such persons may be deemed to be affiliates . This determination of affiliate status is not necessarily a conclusive determination for other purposes . As of February 22 , 2021 , the registrant had outstanding 113,256,101 shares of common stock . DOCUMENTS INCORPORATED BY REFERENCE Portions of the Definitive Proxy Statement for the registrant's 2021 Annual Meeting of Stockholders are incorporated by reference into Part III , Items 10-14 of this Form 10 - K . The Definitive Proxy Statement will be filed no later than 120 days after the close of the registrant's fiscal year ended December 31 , 2020 .