AEE Ameren Corp

Your Vote Counts! *Please check the meeting materials for any special requirements for meeting attendance. Smartphone users Point your camera here and vote without entering a control number For complete information and to vote, visit www.ProxyVote.com Control # V65815-Z89391-P26088 AMEREN CORPORATION 1901 CHOUTEAU AVENUE, MC-1310 ST. LOUIS, MO 63103 AMEREN CORPORATION 2025 Annual Meeting Vote by May 7, 2025 11:59 PM ET You invested in AMEREN CORPORATION and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy materials for the shareholder meeting to be held on May 8, 2025. Vote Virtually at the Meeting* May 8, 2025 10:00 A.M. CDT Virtually at: www.virtualshareholdermeeting.com/AEE2025 Get informed before you vote View the Notice and Proxy Statement and Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to April 24, 2025. If you would like to request a copy of the material(s) for this and/or future shareholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy.

Vote at www.ProxyVote.com Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Delivery Settings”. Voting Items Board Recommends V65816-Z89391-P26088 THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming shareholder meeting. Please follow the instructions on the reverse side to vote these important matters. ITEM 1 COMPANY PROPOSAL - ELECTION OF DIRECTORS—NOMINEES FOR DIRECTOR Nominees: 1a. CYNTHIA J. BRINKLEY For 1b. CATHERINE S. BRUNE For 1c. WARD H. DICKSON For 1d. NOELLE K. EDER For 1e. ELLEN M. FITZSIMMONS For 1f. RAFAEL FLORES For 1g. KIMBERLY J. HARRIS For 1h. RICHARD J. HARSHMAN For 1i. CRAIG S. IVEY For 1j. STEVEN H. LIPSTEIN For 1k. MARTIN J. LYONS, JR. For 1l. LEO S. MACKAY, JR. For 1m. STEVEN O. VONDRAN For ITEM 2 - COMPANY PROPOSAL - ADVISORY APPROVAL OF COMPENSATION OF THE NAMED EXECUTIVE OFFICERS DISCLOSED IN THE PROXY STATEMENT. For ITEM 3 - COMPANY PROPOSAL - RATIFICATION OF THE APPOINTMENT OF PRICEWATERHOUSECOOPERS LLP AS INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM FOR THE FISCAL YEAR ENDING DECEMBER 31, 2025. For ITEM 4 - SHAREHOLDER PROPOSAL - EVALUATION BY A THIRD-PARTY OF SHORT- AND MEDIUM-TERM GREENHOUSE GAS EMISSIONS REDUCTION TARGETS. Against NOTE: In their discretion, the proxies are authorized to vote on such other business as may properly come before the meeting or any adjournment thereof.