Latest EDGAR 4 filed on 2026-07-06, report date 2026-07-01: Smith Patrick E / AMEREN CORP reports ownership changes; on 07/01/2026; in Common Stock, $.01 Par Value; including 3,113 shares at 968 per share; 1. Represents the estimated number of share equivalents held by the reporting person in the unitized stock fund included in the Ameren Corporation Savings Investment Plan as of June 30, 2026. 2. These restricted stock units were granted under the issuer's 2022 Omnibus Incentive Compensation Plan (the "Plan") and are scheduled to vest upon the payment date in 2029, which shall be no later than March 15, 2029, subject to the terms of the Plan and the applicable award agreement issued thereunder. 3. Amount includes 84 accrued dividend equivalents acquired during the first and second quarters of 2026 pursuant to a dividend reinvestment feature of restricted stock units granted under the issuer's 2022 Omnibus Incentive Compensation Plan. Remarks: Jonathan T. Shade, Deputy Corp. Secy. for Ameren Corporation, attorney-in-fact for Patrick E. Smith 07/06/2026 ** Signature of Reporting Person Date Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. * If the form is filed by more than one reporting person, see Instruction (b)(v). ** Intentional misstatements or omissions of facts constitute Federal Criminal Violations 18 U.S.C. 1001 and 15 U.S.C. 78ff(a). Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, Instruction 6 for procedure. Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number. * Form 4: SEC 1474 (03-26)