X0508 4/A 2025-11-17 2025-11-18 0 0001002910 AMEREN CORP AEE 0001656999 Flores Rafael 1901 CHOUTEAU AVE, MC 1310 P.O. BOX 66149 ST. LOUIS MO 63166-6149 1 0 0 0 0 Common Stock, $.01 Par Value 2025-11-17 4 S 0 626 105.32 D 13772 D This price is a weighted average price. These shares were sold in multiple transactions at prices ranging from $105.21 to $105.38. The reporting person undertakes to provide Ameren Corporation (Ameren), any security holder of Ameren, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within such range. Amount includes a total of 291 shares acquired during the first through third quarters of 2025 through reinvested dividends. This amended Form 4 is being filed to correct the number of shares sold, sale price, and amount of shares beneficially owned following the reported transaction as reflected in the original filing made on November 18, 2025. Jonathan T. Shade, Deputy Corp. Secy. of Ameren Corporation, attorney-in-fact for Rafael Flores 2026-01-07