O: 8-K company filing

o-20260521 United States Securities and Exchange Commission Washington, D.C. 20549 Form 8-K Current Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report: May 21, 2026 (Date of Earliest Event Reported) REALTY INCOME CORPORATION (Exact name of registrant as specified in its charter) Maryland 1-13374 33-0580106 (State or Other Jurisdiction of Incorporation or Organization) (Commission File Number) (IRS Employer Identification No.) 11995 El Camino Real , San Diego , California 92130 (Address of principal executive offices) ( 858 ) 284-5000 (Registrant’s telephone number, including area code) N/A (former name or former address, if changed since last report) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act: Title of Each Class Trading Symbol(s) Name of Each Exchange On Which Registered Common Stock, $0.01 Par Value O New York Stock Exchange 1.125% Notes due 2027 O27A New York Stock Exchange 1.875% Notes due 2027 O27B New York Stock Exchange 5.000% Notes due 2029 O29B New York Stock Exchange 1.625% Notes due 2030 O30 New York Stock Exchange 4.875% Notes due 2030 O30B New York Stock Exchange 5.750% Notes due 2031 O31A New York Stock Exchange 3.375% Notes due 2031 O31B New York Sto