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Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K ANNUAL REPORT UNDER 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 Commission File Number 000-51470 AtriCure AtriCure , Inc. ( Exact name of registrant as specified in its charter ) Delaware State or other jurisdiction of incorporation or organization 7555 Innovation Way , Mason , OH ( Address of principal executive offices ) Title of each class Common Stock , $ .001 par value 34-1940305 ( I.R.S. Employer Identification Number ) Registrant's telephone number including area code : ( 513 ) 755-4100 Securities Registered Pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) 45040 ( Zip Code ) Name of each exchange on which registered NASDAQ ATRC 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 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 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 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 Accelerated Filer Non - 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 : ` Class Common Stock , $ .001 par value 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 Exchange Act ) . Yes No The aggregate market value of the voting Common Stock held by non - affiliates of the registrant , based upon the closing sale price of the Common Stock on June 30 , 2020 , the last business day of the registrant's most recently completed second fiscal quarter as reported on the NASDAQ Global Market , was $ 1,960.6 million . Outstanding February 24 , 2021 45,573,003 DOCUMENTS INCORPORATED BY REFERENCE Items 10 , 11 , 12 , 13 and 14 of Part III of this Form 10 - K incorporate information by reference from the registrant's definitive proxy statement to be filed with the Securities and Exchange Commission within 120 days after the end of the fiscal year covered by this Form 10 - K .