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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 De mber 31 , 2020 . OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 ☐ Delaware ( State or other jurisdiction of incorporation or organization ) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K Title of each class Common Stock For the transition period from to Commission File Number : 001-38847 SILK ROAD MEDICAL , INC . ( Exact name of registrant as specified in its charter ) 3841 ( Primary Standard Industrial Classification Code Number ) 1213 Innsbruck Dr. Sunnyvale , CA 94089 , ( 408 ) 720-9002 ( Address , including zip code , and telephone number , including area code , of registrant's principal executive offices ) 20-8777622 ( I.R.S. Employer Identification Number ) Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) SILK Name of each exchange on which registered Nasdaq Global Select Market 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 > 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 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 No Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , 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 . ( Check one ) : 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 7 ( a ) ( 2 ) ( B ) of the Securities Act . ☐ Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of 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 As of February 26 , 2021 , the number of outstanding shares of the registrant's common stock , par value $ 0.001 per share , was 34,365,398 . The aggregate market value of the registrant's common stock held by non - affiliates of the registrant was approximately $ 1.4 billion as of June 30 , 2020 based on the closing sale price of the registrant's common stock on the NASDAQ Global Select Market on such date . Shares held by persons who may be deemed affiliates have been excluded . This determination of affiliate status is not necessarily a conclusive determination for other purposes .