Ameren (AEE) Proxy Filing summary

Executive summary

• Supplement provides updated information for the 2025 Annual Meeting scheduled for May 8, 2025.

• Notice and Proxy Statement were distributed to shareholders on March 25, 2025.

Voting matters and shareholder proposals

• Noelle K. Eder, previously nominated for re-election, has withdrawn due to a change in primary employment requiring relocation outside the U.S.

• The Board will reduce its size to 11 directors, with no replacement nominee for Ms. Eder.

• Proxy votes already submitted remain valid; votes will not be cast for Ms. Eder.

• All other agenda items and voting instructions remain unchanged.

Board of directors and corporate governance

• Ms. Eder's resignation is effective May 6, 2025, and is not due to any disagreement with the company.

• The Board will adjust its composition in accordance with the Bylaws following her departure.