AMEREN CORP (AEE) · Insider Trading (Form 4) SEC Filing

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-02-27 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: AMEREN CORP (AEE) CIK: 0001002910 --- Reporting Owner --- Name: Martin Ryan J CIK: 0002093849 Role: Officer (SVP Finance) --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock, $.01 Par Value Date: 2026-02-27 | Code: F (Payment of exercise/tax) Shares: -726 | Price: $113.28 Total Value: $82,241.28 Shares Owned After: 27,779 | Ownership: D (Direct) Footnotes: [F2] Shares withheld by the issuer to satisfy tax withholding obligations arising in connection with the vesting of performance share units and restricted stock units. --- Holdings --- [Holding #1] Security: Common Stock, $.01 Par Value Ownership: I (Indirect) Footnotes: [F1] 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 February 28, 2026. --- Footnotes (Complete Index) --- F1: 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 February 28, 2026. F2: Shares withheld by the issuer to satisfy tax withholding obligations arising in connection with the vesting of performance share units and restricted stock units. --- Signature --- /s/ Jonathan T. Shade, Deputy Corp. Secy. for Ameren Corporation, attorney-in-fact for Ryan J. Martin (2026-03-03)