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Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 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 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 001-32319 FORM 10 - K Maryland ( State or Other Jurisdiction of Incorporation or Organization ) Sunstone Hotel Investors , Inc. ( Exact Name of Registrant as Specified in Its Charter ) st 200 Spectrum Center Drive , 21 Floor Irvine , California ( Address of Principal Executive Offices ) Registrant's telephone number , including area code : ( 949 ) 330-4000 Securities registered pursuant to Section 12 ( b ) of the Act : Title of Each Class Common Stock , $ 0.01 par value Series E Cumulative Redeemable Preferred Stock , $ 0.01 par value Series F Cumulative Redeemable Preferred Stock , $ 0.01 par value Securities registered pursuant to Section 12 ( g ) of the Act : None 20-1296886 ( I.R.S. Employer Identification Number ) Trading Symbol ( s ) SHO SHO.PRE SHO.PRF Large accelerated filer Non - accelerated filer 92618 ( Zip Code ) Name of Each Exchange on Which Registered New York Stock Exchange New York Stock Exchange New York Stock Exchange 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 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 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 Exchange Act ) . Yes No The aggregate market value of the voting stock held by non - affiliates of the registrant based upon the closing sale price of the registrant's common stock on June 30 , 2020 as reported on the New York Stock Exchange was approximately $ 1.7 billion . The number of shares of the registrant's common stock outstanding as of February 5 , 2021 was 215,593,401 . Documents Incorporated by Reference Part III of this Report incorporates by reference information from the definitive Proxy Statement for the registrant's 2021 Annual Meeting of Stockholders .