Management Change/Compensation (Form 8-K)

ITEM 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On and effective October 2, 2025 (the "Effective Date"), Mark C. Birk informed Ameren Corporation (the "Company") of his decision to retire from his position as Chairman and President of Union Electric Company, doing business as Ameren Missouri ("Ameren Missouri"), and from each other position he holds with subsidiaries of the Company.

As of the Effective Date, Michael L. Moehn, who currently serves as the Company's Senior Executive Vice President and Chief Financial Officer, has been elected to the additional position of Interim Chairman and President of Ameren Missouri. Mr. Moehn has served as the Company's Chief Financial Officer since 2019 and previously served as Chairman and President of Ameren Missouri from 2014 to 2019.