AEE: 10-Q financial filing

aee-20260930 Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ 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 for the transition period from to Commission File Number Exact name of registrant as specified in its charter; State of Incorporation; Address and Telephone Number IRS Employer Identification No. 1-14756 Ameren Corporation 43-1723446 ( Missouri Corporation) 1901 Chouteau Avenue St. Louis , Missouri 63103 (314) 621-3222 1-2967 Union Electric Company 43-0559760 ( Missouri Corporation) 1901 Chouteau Avenue St. Louis , Missouri 63103 (314) 621-3222 1-3672 Ameren Illinois Company 37-0211380 ( Illinois Corporation) 10 Richard Mark Way Collinsville , Illinois 62234 (618) 343-8150 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 per share AEE New York Stock Exchange Table of Contents Indicate by check mark whether each 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. Ameren Corporation Yes ☒ No ☐ Union Electric Company Yes ☒ No ☐ Ameren Illinois Company Yes ☒ No ☐ Indicate by check mark whether each 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) durin