Ameren (AEE)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-08-18 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: 2026-08-18 | Code: S (Open market sale) Shares: -471 | Price: $109.87 Total Value: $51,748.77 Shares Owned After: 26,008 | Ownership: D (Direct) [Transaction #2] Security: Common Stock, $.01 Par Value Date: 2026-08-20 | Code: S (Open market sale) Shares: -500 | Price: $109.88 Total Value: $54,940.00 Shares Owned After: 25,595 | Ownership: D (Direct) Footnotes: [F2] Amount includes 87 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. --- 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 July 31, 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 July 31, 2026. F2: Amount includes 87 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. --- Signature --- /s/ Jonathan T. Shade, Deputy Corp. Secy. for Ameren Corporation, attorney-in-fact for Ryan J. Martin (2026-08-20)