Ameren Corporation, together with its subsidiaries, operates as a public utility holding company in the United States. It operates through four segments: Ameren Missouri, Ameren Illinois Electric Distribution, Ameren Illinois Natural Gas, and Ameren Transmission. The company engages in the rate-regulated electric generation, transmission, and distribution activities; and rate-regulated natural gas distribution and transmission businesses. It primarily generates electricity through coal, nuclear, and natural gas, as well as renewable sources, such as hydroelectric, wind, methane gas, and solar. The company serves residential, commercial, and industrial customers. Ameren Corporation was founded in 1881 and is headquartered in St. Louis, Missouri.

Ameren Corporation

Initial Statement of Beneficial Ownership

Insider	Title	Transaction Type	Shares Traded	% of Shares Traded	% Chg. in Shares	End of Filing Shares	Price	Transaction Value	Filing Date	Transaction Date
Steven H. Lipstein	Independent Director Show All	Other Disposition (Other Disposition)	-2.3K	-0.00085%	-6.0%	36.2K	—	—	01 Dec 2025	26 Nov 2025 - 26 Nov 2025
Rafael Flores	Independent Director Show All	Open Market Disposition (Open Market Disposition)	-225.0	-0.000083%	-15.4%	1.2K	105.2 - 105.2	-23.7K	18 Nov 2025	17 Nov 2025 - 17 Nov 2025
Patrick E. Smith	Senior Vice President of Operations & Technical Services Show All	Other Disposition (Other Disposition)	-120.0	-0.000044%	-0.8%	15.3K	—	—	18 Nov 2025	14 Nov 2025 - 14 Nov 2025
Patrick E. Smith	Senior Vice President of Operations & Technical Services Show All	Open Market Disposition (Open Market Disposition)	-2.4K	-0.000888%	-13.6%	15.3K	104.8 - 104.8	-251.9K	18 Nov 2025	14 Nov 2025 - 14 Nov 2025
Theresa A. Shaw	Senior VP of Finance & Chief Accounting Officer Show All	Other Disposition (Other Disposition)	-1.4K	-0.000529%	-5.0%	27.1K	—	—	18 Nov 2025	14 Nov 2025 - 14 Nov 2025
Theresa A. Shaw
Richard J. Harshman
David M. Feinberg
Rafael Flores
Richard J. Harshman
Michael L. Moehn
Eric V. Seidler	—
Patrick E. Smith
Eric V. Seidler	—
Patrick E. Smith
Ryan J. Martin	—
Ryan J. Martin	—
Ajay K. Arora
Ajay K. Arora
Michael L. Moehn
Theresa A. Shaw
Mark C. Lindgren
Gwendolyn Goosby Mizell
Gwendolyn Goosby Mizell
Shawn E. Schukar
Michael L. Moehn
Michael L. Moehn
Michael L. Moehn
Michael L. Moehn
Gwendolyn Goosby Mizell