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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 December 31 , 2020 OR UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from DELAWARE ( State or other jurisdiction of incorporation or organization ) Title of each class Common Stock , $ 0.01 Par Value Large accelerated filer Non - accelerated filer Emerging growth to company Commission File No. 001-10362 MGM RESORTS INTERNATIONAL ( Exact name of Registrant as specified in its charter ) □ □ □ 88-0215232 ( I.R.S. Employer Identification Number ) 3600 Las Vegas Boulevard South - Las Vegas , Nevada 89109 ( Address of principal executive office ) ( Zip Code ) ( 702 ) 693-7120 ( Registrant's telephone number , including area code ) Securities registered pursuant to Section 12 ( b ) of the Act : 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 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 Trading Symbol ( s ) MGM Securities registered pursuant to Section 12 ( g ) of the Act : None Name of each exchange on which registered New York Stock Exchange ( NYSE ) 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 . Accelerated filer Smaller reporting company 0 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 . No | Indicate by check mark whether the Registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) : Yes The aggregate market value of the Registrant's Common Stock held by non - affiliates of the Registrant as of June 30 , 2020 ( based on the closing price on the New York Stock Exchange Composite Tape on June 30 , 2020 ) was $ 7.9 billion . As of February 23 , 2021 , 494,853,355 shares of Registrant's Common Stock , $ 0.01 par value , were outstanding . DOCUMENTS INCORPORATED BY REFERENCE Portions of the Registrant's definitive Proxy Statement for its 2021 Annual Meeting of Stockholders are incorporated by reference into Part III of this Form 10 - K .