SPG: 10-Q financial filing

SIMON PROPERTY GROUP, INC._September 30, 2026 Table of Contents ​ ​ ​ UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ​ ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2026 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 SIMON PROPERTY GROUP, INC. SIMON PROPERTY GROUP, L.P. (Exact name of registrant as specified in its charter) Indiana (Simon Property Group, Inc.) Indiana (Simon Property Group, L.P.) (State or other jurisdiction of incorporation or organization) 001-14469 (Simon Property Group, Inc.) 001-36110 (Simon Property Group, L.P.) (Commission File No.) 04-6268599 (Simon Property Group, Inc.) 34-1755769 (Simon Property Group, L.P.) (I.R.S. Employer Identification No.) 225 West Washington Street Indianapolis , Indiana 46204 (Address of principal executive offices) ( 317 ) 636-1600 (Registrant’s telephone number, including area code) ​ Securities registered pursuant to Section 12(b) of the Act: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Title of each class ​ ​ ​ Trading Symbols ​ ​ ​ Name of each exchange on which registered Simon Property Group, Inc. ​ Common stock, $0.0001 par value ​ SPG ​ New York Stock Exchange Simon Property Group, Inc. ​ 8 3 / 8 % Series J Cumulative Redeemable Preferred Stock, $0.0001 par value ​ SPGJ ​ New York Stock Exchange 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. ​ ​ Simon Property Grou