Form 4 Filing for Theresa A. Shaw

Theresa A. Shaw, SVP and CATO of AMEREN CORP, reported a transaction on August 14, 2026. She disposed of 325 shares of Common Stock, $.01 Par Value, at a price of $108.93 per share. Following this transaction, her post-transaction shares amount to 32,340. Additionally, Ms. Shaw holds 928 shares in her 401(k) account, which includes accrued dividend equivalents from restricted stock units. The filing was signed by Jonathan T. Shade, Deputy Corp. Secy., as attorney-in-fact for Ms. Shaw.