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REALTY INCOME The Monthly Dividend Company® UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , DC 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 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 1-13374 REALTY INCOME CORPORATION ( Exact name of registrant as specified in its charter ) Maryland ( State or Other Jurisdiction of Incorporation or Organization ) 33-0580106 Title of each Class Common Stock , $ 0.01 Par Value 1.625 % Notes due 2030 ( IRS Employer Identification No. ) 11995 El Camino Real , San Diego , California , 92130 ( Address of Principal Executive Offices ) Registrant's telephone number , including area code : ( 858 ) 284-5000 Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol Name of each exchange on which registered New York Stock Exchange New York Stock Exchange O 030 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 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 . X Accelerated filer Large 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 . 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 > At June 30 , 2020 , the aggregate market value of the Registrant's shares of common stock , $ 0.01 par value , held by non - affiliates of the Registrant was $ 20.5 billion based upon the last reported sale price of $ 59.50 per share on the New York Stock Exchange on June 30 , 2020 , the last business day of the Registrant's most recently completed second fiscal quarter . The determination of affiliate status for purposes of this calculation is not necessarily a conclusive determination for other purposes . At February 15 , 2021 , the number of shares of common stock outstanding was 373,390,661 .