Summary
Ameren Corporation (AEE) announced a significant leadership change in its key subsidiary, Ameren Missouri, through an 8-K filing dated October 3, 2025. Mark C. Birk has retired from his roles as Chairman and President of Ameren Missouri, effective October 2, 2025. This marks the end of Mr. Birk's tenure in these critical positions within the company's largest operating utility. In response to Mr. Birk's retirement, Michael L. Moehn, currently Ameren Corporation's Senior Executive Vice President and Chief Financial Officer, has been appointed as the Interim Chairman and President of Ameren Missouri. Mr. Moehn brings a wealth of experience, having previously held the top leadership position at Ameren Missouri from 2014 to 2019 and serving as CFO since 2019. This interim appointment suggests a strategic move to maintain stability and leverage experienced leadership during the transition.
Key Highlights
- 1Mark C. Birk has retired as Chairman and President of Ameren Missouri, effective October 2, 2025.
- 2Michael L. Moehn has been appointed as Interim Chairman and President of Ameren Missouri.
- 3Mr. Moehn currently serves as Ameren Corporation's Senior Executive Vice President and Chief Financial Officer.
- 4Mr. Moehn has prior experience as Chairman and President of Ameren Missouri from 2014 to 2019.
- 5The retirement and interim appointment are effective as of October 2, 2025.
- 6The filing indicates a smooth transition of leadership within Ameren Missouri.