X0508 4 2026-02-05 0 0001002910 AMEREN CORP AEE 0002094778 Smith Patrick E 1901 CHOUTEAU AVENUE SAINT LOUIS MO 63103 0 1 0 0 Chairman & President of Sub 0 Common Stock, $.01 Par Value 3045 I By 401(k) Common Stock, $.01 Par Value 1090 I By spouse Common Stock, $.01 Par Value 2026-02-05 4 A 0 3663 0 A 18620 D Common Stock, $.01 Par Value 2026-02-05 4 A 0 2178 0 A 20822 D 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 January 31, 2026. 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. Shares acquired upon vesting of previously-granted performance share units. Amount includes 24 accrued dividend equivalents acquired during the fourth quarter of 2025 pursuant to a dividend reinvestment feature of restricted stock units granted under the Plan. Jonathan T. Shade, Deputy Corp. Secy. for Ameren Corporation, attorney-in-fact for Patrick E. Smith 2026-02-09