# EDGAR Filing Document

**Accession Number:** 0001002910
**File Stem:** 0001104659-23-037753
**Filing Date:** 2023-3
**Character Count:** 5261
**Document Hash:** c11d0e032f855347f32067729ad574a6
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-23-037753.hdr.sgml**: 20230328

**ACCESSION NUMBER**: 0001104659-23-037753

**CONFORMED SUBMISSION TYPE**: DEFA14A

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20230328

**DATE AS OF CHANGE**: 20230328

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** AMEREN CORP
- **CENTRAL INDEX KEY:** 0001002910
- **STANDARD INDUSTRIAL CLASSIFICATION:** ELECTRIC & OTHER SERVICES COMBINED [4931]
- **IRS NUMBER:** 431723446
- **STATE OF INCORPORATION:** MO
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-14756
- **FILM NUMBER:** 23770149

**BUSINESS ADDRESS:**
- **STREET 1:** 1901 CHOUTEAU AVE
- **STREET 2:** MC 1310
- **CITY:** ST LOUIS
- **STATE:** MO
- **ZIP:** 63166-6149
- **BUSINESS PHONE:** 314-621-3222

**MAIL ADDRESS:**
- **STREET 1:** 1901 CHOUTEAU AVE
- **STREET 2:** MC 1310
- **CITY:** ST LOUIS
- **STATE:** MO
- **ZIP:** 63103

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

**SCHEDULE 14A**

**Proxy Statement Pursuant to Section 14(a) of the**

**Securities Exchange Act of 1934**

**(Amendment No.)**

Filed by the Registrant ⌧

Filed by a party other than the Registrant ◻

Check the appropriate box:

---

| | |
|:---|:---|
| ¨ | Preliminary Proxy Statement |
| ¨ | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) |
| ¨ | Definitive Proxy Statement |
| x | Definitive Additional Materials |
| ¨ | Soliciting Material under §240.14a-12 |

---

**Ameren Corporation**

**(Name of Registrant as Specified In Its Charter)**

**(Name of Person(s) Filing Proxy Statement, if other than the Registrant)**

Payment of Filing Fee (Check all boxes that apply):

x No fee required <br> ¨ Fee paid previously with preliminary materials <br> ¨ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11

---

| | |
|:---|:---|
| &nbsp;&nbsp;![GRAPHIC](tm231804d3_defa14aimg001.jpg) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Your Vote Counts! AMEREN CORPORATION 1901 CHOUTEAU AVENUE, MC-1310 ST. LOUIS, MO 63103 AMEREN CORPORATION 2023 Annual Meeting Vote by May 10, 2023 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 material for the shareholder meeting to be held on May 11, 2023. Vote Virtually at the Meeting\* May 11, 2023 10:00 A.M. CDT Virtually at: www.virtualshareholdermeeting.com/AEE2023 \*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 V1.1 For complete information and to vote, visit www.ProxyVote.com Control # V05938-P86858-Z84369 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 27, 2023. 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. |

---

---

| | |
|:---|:---|
| &nbsp;&nbsp;![GRAPHIC](tm231804d3_defa14aimg002.jpg) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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. Vote at www.ProxyVote.com Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click "Sign up for E-delivery". Voting Items Board Recommends V05939-P86858-Z84369 ITEM 1 COMPANY PROPOSAL - ELECTION OF DIRECTORS - NOMINEES FOR DIRECTOR Nominees: 1 Year 1b. CYNTHIA J. BRINKLEY 1c. CATHERINE S. BRUNE 1a. WARNER L. BAXTER 1d. J. EDWARD COLEMAN 1e. WARD H. DICKSON 1f. NOELLE K. EDER 1g. ELLEN M. FITZSIMMONS 1h. RAFAEL FLORES 1i. RICHARD J. HARSHMAN 1j. CRAIG S. IVEY 1k. JAMES C. JOHNSON 1m. STEVEN H. LIPSTEIN 1l. MARTIN J. LYONS, JR. 1n. LEO S. MACKAY, JR 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. For For For For For For For For For For For For For For For For ITEM 2 – COMPANY PROPOSAL - ADVISORY APPROVAL OF COMPENSATION OF THE NAMED EXECUTIVE OFFICERS DISCLOSED IN THE PROXY STATEMENT. ITEM 3 – COMPANY PROPOSAL - ADVISORY APPROVAL OF THE FREQUENCY OF EXECUTIVE COMPENSATION SHAREHOLDER ADVISORY VOTE. ITEM 4 – COMPANY PROPOSAL - RATIFICATION OF THE APPOINTMENT OF PRICEWATERHOUSECOOPERS LLP AS INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM FOR THE FISCAL YEAR ENDING DECEMBER 31, 2023. ITEM 5 – SHAREHOLDER PROPOSAL REGARDING THE ADOPTION OF SCOPES 1 AND 2 EMISSIONS TARGETS. Against |

---