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Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 Form 10 - K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 27 , 2020 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number : 001-38580 AA . IAA , Inc. ( Exact name of Registrant as specified in its charter ) Delaware ( State or other jurisdiction of incorporation or organization ) Securities registered pursuant to Section 12 ( b ) of the Act : Two Westbrook Corporate Center , Suite 500 , Westchester , Illinois , 60154 ( Address of principal executive offices , including zip code ) Registrant's telephone number , including area code : ( 708 ) 492-7000 Title of each class Common Stock , par value $ 0.01 per share Securities registered pursuant to Section 12 ( g ) of the Act : None Trading Symbol ( s ) IAA 83-1030538 ( I.R.S. Employer Identification No. ) Name of each exchange on which registered New York Stock Exchange No x Nox 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 x 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 x No Non - accelerated filer " 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 . Large accelerated filer X 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 registrant's common stock held by non - affiliates ( as defined by regulations of the Securities and Exchange Commission ) of the registrant was $ 5,039,941,174 at June 26 , 2020 , the last business day of the registrant's most recently completed second fiscal quarter . As of February 12 , 2021 , 134,552,449 shares of the registrant's common stock , par value $ 0.01 per share , were outstanding . Documents Incorporated by Reference Certain information required by Part III of this Annual Report on Form 10 - K is incorporated by reference herein from the registrant's Definitive Proxy Statement for its 2021 Annual Meeting of Stockholders to be filed with the SEC within 120 days after the end of the registrant's fiscal year ended December 27 , 2020 .