Ameren (AEE) Proxy Filing summary

Executive summary

• The supplement updates shareholders on a change to the Board nominee slate for the 2025 Annual Meeting scheduled for May 8, 2025.

• Kimberly J. Harris resigned from the Board for personal reasons, effective immediately, and her nomination for re-election is withdrawn.

• The Board will reduce its size to 13 directors, with no replacement nominee for Ms. Harris.

Voting matters and shareholder proposals

• Proxy voting forms already submitted remain valid; votes will not be cast for Ms. Harris.

• No action is required from shareholders unless they wish to change their vote.

• All other agenda items and voting instructions remain unchanged for the Annual Meeting.

Board of directors and corporate governance

• The Board expects to decrease its size to 13 members following Ms. Harris's resignation.

• Ms. Harris's resignation was not due to any disagreement with the company.