# EDGAR Filing Document

**Accession Number:** 0001002910
**File Stem:** 0001104659-25-121146
**Filing Date:** 2025-12
**Character Count:** 9288
**Document Hash:** 9cb7185029197bdf169a3d768da0842b
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-25-121146.hdr.sgml**: 20251215

**ACCESSION NUMBER**: 0001104659-25-121146

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 16

**CONFORMED PERIOD OF REPORT**: 20251212

**ITEM INFORMATION**: Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

**ITEM INFORMATION**: Regulation FD Disclosure

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20251215

**DATE AS OF CHANGE**: 20251215

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** AMEREN CORP
- **CENTRAL INDEX KEY:** 0001002910
- **STANDARD INDUSTRIAL CLASSIFICATION:** ELECTRIC & OTHER SERVICES COMBINED [4931]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 431723446
- **STATE OF INCORPORATION:** MO
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-14756
- **FILM NUMBER:** 251571791

**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

?xml version='1.0' encoding='ASCII'?

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

**FORM 8-K**

**CURRENT REPORT**

**Pursuant to Section 13 or 15(d) of the**

**Securities Exchange Act of 1934**

**Date of report (Date of earliest event reported): December 12, 2025**

**AMEREN CORPORATION**

**(Exact Name of Registrant as Specified in Charter)**

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| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Missouri** | &nbsp;&nbsp;**1-14756** | &nbsp;&nbsp;**43-1723446** |
| &nbsp;&nbsp;**(State or other jurisdiction of <br> incorporation)** | &nbsp;&nbsp;**(Commission File Number)** | &nbsp;&nbsp; **(IRS Employer Identification<br> Number)** |

---

**1901 Chouteau Avenue, St. Louis, Missouri 63103**

**(Address of principal executive offices and Zip Code)**

**Registrant's telephone number, including area code: (314) 621-3222**

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

◻ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

◻ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

◻ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

◻ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

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| | |
|:---|:---|
| &nbsp;&nbsp;**Title of each class** | &nbsp;&nbsp;**Name of each exchange on which registered** |
| &nbsp;&nbsp; **Common Stock, $0.01 par value per share**<br> &nbsp;&nbsp; **AEE** | &nbsp;&nbsp; **New York Stock Exchange** |

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Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). ◻

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ◻

**ITEM 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.**

(d) On December 12, 2025, the Board of Directors (the "Board") of Ameren Corporation ("Ameren") elected Jamie L. Engstrom to the Board, with a term beginning on January 1, 2026, and expiring at Ameren's Annual Meeting of Shareholders in 2026. Also effective January 1, 2026, the Board appointed Ms. Engstrom to the Audit and Risk Committee and the Cybersecurity and Digital Technology Committee of the Board. No arrangement or understanding exists between Ms. Engstrom and Ameren or, to Ameren's knowledge, any other person or persons pursuant to which Ms. Engstrom was selected as a director. Ms. Engstrom will participate in the Company's standard non-employee director compensation program as more fully described in the Company's proxy statement filed with the Securities and Exchange Commission on March 25, 2025.

Ms. Engstrom is the Global Chief Information Officer and Senior Vice President, Global Information Systems of Caterpillar, Inc. ("Caterpillar"), a leading manufacturer of construction and mining equipment, off-highway diesel and natural gas engines, industrial gas turbines and diesel-electric locomotives. Ms. Engstrom previously served as Chief Information Officer for Caterpillar Financial Services Corporation from 2018-2020, following numerous leadership positions in information technology since joining Caterpillar in 1999.

Ms. Engstrom had no business relationships with Ameren or its subsidiaries in 2024 or to the date hereof in 2025 which are required to be reported under Item 404(a) of the Securities and Exchange Commission Regulation S-K.

**ITEM 7.01 Regulation FD Disclosure.**

On December 15, 2025, Ameren issued a press release announcing Ms. Engstrom's election to the Board. A copy of that press release is furnished as Exhibit 99.1 to this Report.

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| | |
|:---|:---|
| **ITEM 9.01** | **Financial Statements and Exhibits.** |

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(d) Exhibits

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| | |
|:---|:---|
| Exhibit<br> Number<br>| Title |
| [99.1](tm2533374d1_ex99-1.htm) | [Press release issued on December 15, 2025, by Ameren.](tm2533374d1_ex99-1.htm) |
| 104 | Cover Page Interactive Data File (formatted as Inline XBRL). |

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**SIGNATURES**

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

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| | |
|:---|:---|
| AMEREN CORPORATION | AMEREN CORPORATION |
| (Registrant) | (Registrant) |
| By: | /s/ David M. Feinberg |
| Name: | David M. Feinberg |
| Title: | Executive Vice President, General Counsel and Secretary |

---

Date: December 15, 2025

## Exhibit 99.1

**Exhibit 99.1**

![](tm2533374d1_ex99-1img001.jpg)

1901 Chouteau Avenue : St. Louis, MO 63103 : Ameren.com

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| | | |
|:---|:---|:---|
| **Contacts:** | **Media**<br> Ameren Communications<br> 314.554.2182<br> communications@ameren.com | &nbsp;&nbsp;&nbsp;&nbsp;**Financial Analysts and Institutional Investors**<br> Andrew Kirk<br> &nbsp;&nbsp;&nbsp;&nbsp;314.554.3942<br> akirk@ameren.com |

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**FOR IMMEDIATE RELEASE**

**Jamie Engstrom joins Ameren board of directors**

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| | |
|:---|:---|
| ST. LOUIS (Dec. 15, 2025) – Ameren Corporation (NYSE: AEE) announced today that **Jamie L. Engstrom** has been elected to the Ameren board of directors, effective Jan. 1, 2026. | ![](tm2533374d1_ex99-1img002.jpg) |
|  | ![](tm2533374d1_ex99-1img002.jpg) |
| Engstrom has served as the senior vice president and global chief information officer of Caterpillar Inc. since 2020. Caterpillar is a leading manufacturer of construction and mining equipment, off-highway diesel and natural gas engines, industrial gas turbines and diesel-electric locomotives. Engstrom previously served as chief information officer of Caterpillar Financial Services Corporation from 2018 to 2020, following numerous other leadership roles in information technology since joining Caterpillar in 1999.<br>"We are extremely pleased to have Jamie join Ameren's board of directors," said **Martin J. Lyons**, chairman, president and chief executive officer of Ameren. "As we continue to transform our business and leverage technology to provide reliable, resilient and affordable energy, Jamie's extensive expertise in information systems, risk management, cybersecurity and digital transformations will bring immediate value to our customers, shareholders and the board of directors." <br>Engstrom earned a Master of Business Administration from Bradley University and a Bachelor of Science in business management and business information systems from Illinois State University.<br>| ![](tm2533374d1_ex99-1img002.jpg) |

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**About Ameren Corporation**

St. Louis-based Ameren Corporation powers the quality of life for 2.5 million electric customers and more than 900,000 natural gas customers in a 64,000-square-mile area through its Ameren Missouri and Ameren Illinois rate-regulated utility subsidiaries. Ameren Illinois provides electric transmission and distribution service and natural gas distribution service. Ameren Missouri provides electric generation, transmission and distribution service, as well as natural gas distribution service. Ameren Transmission Company of Illinois develops, owns and operates rate-regulated regional electric transmission projects in the Midcontinent Independent System Operator, Inc. For more information, visit <u>Ameren.com</u>, or follow us at <u>@AmerenCorp</u>, <u>Facebook.com/AmerenCorp</u>, or <u>LinkedIn.com/company/Ameren</u>.

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![](tm2533374d1_ex99-1img003.jpg)