# EDGAR Filing Document

**Accession Number:** 0000100826
**File Stem:** 0001104659-26-078317
**Filing Date:** 2026-6
**Character Count:** 7474
**Document Hash:** f05621311a65f8e77a9cfdd19ca3e872
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-26-078317.hdr.sgml**: 20260626

**ACCESSION NUMBER**: 0001104659-26-078317

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 12

**CONFORMED PERIOD OF REPORT**: 20260626

**ITEM INFORMATION**: Other Events

**FILED AS OF DATE**: 20260626

**DATE AS OF CHANGE**: 20260626

**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:** 261130242

**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
**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** UNION ELECTRIC CO
- **CENTRAL INDEX KEY:** 0000100826
- **STANDARD INDUSTRIAL CLASSIFICATION:** ELECTRIC SERVICES [4911]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 430559760
- **STATE OF INCORPORATION:** MO
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-02967
- **FILM NUMBER:** 261130243

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

**MAIL ADDRESS:**
- **STREET 1:** 1901 CHOUTEAU AVENUE
- **STREET 2:** MC 1310
- **CITY:** ST LOUIS
- **STATE:** MO
- **ZIP:** 63166

?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): June 26, 2026**

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;<br>**<u>Commission File Number</u>** | &nbsp;&nbsp;**Exact Name of Registrant as <br> Specified in Charter;**<br> **State of Incorporation;**<br> **<u>Address and Telephone Number</u>** | &nbsp;&nbsp;<br> **IRS Employer**<br> **<u>Identification Number</u>** |
| &nbsp;&nbsp;<br>**1-14756** | &nbsp;&nbsp; <br>**Ameren Corporation**<br> **(Missouri Corporation)**<br> **1901 Chouteau Avenue**<br> **St. Louis** **, Missouri 63103**<br> **(314) 621-3222**<br>| &nbsp;&nbsp;<br>**43-1723446** |
| &nbsp;&nbsp;**1-2967** | &nbsp;&nbsp;**Union Electric Company**<br> **(Missouri Corporation)**<br> **1901 Chouteau Avenue**<br> **St. Louis** **, Missouri 63103** <br> **(314) 621-3222** | &nbsp;&nbsp;**43-0559760** |

---

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrants 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:

---

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

---

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).

Emerging growth company <br> Ameren Corporation ◻ <br> Union Electric Company ◻

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.

Ameren Corporation ◻ <br> Union Electric Company ◻

---

| | |
|:---|:---|
| **ITEM 8.01** | **Other Events.** |

---

On June 26, 2026, Union Electric Company, doing business as Ameren Missouri ("Ameren Missouri"), filed a request with the Missouri Public Service Commission ("MoPSC") seeking approval to increase its annual revenues for electric service by $343 million. The electric rate request is based on a 10.25% return on common equity, a capital structure composed of 52% common equity, a rate base of $16.7 billion, and a test year ended March 31, 2026, with certain pro-forma adjustments expected through an anticipated true-up date of December 31, 2026. Ameren Missouri also requested continued use of the fuel adjustment clause and trackers, including trackers for pension and postretirement benefits, certain excess deferred income taxes, and the utilization of production and investment tax credits or proceeds from the sale of tax credits, which the MoPSC previously authorized in earlier electric rate orders. The electric rate request reflects the following:

&nbsp;&nbsp;&nbsp;&nbsp;· increased transmission and distribution infrastructure investments to ensure system reliability and resiliency;

&nbsp;&nbsp;&nbsp;&nbsp;· investments in existing generation resources and 400 megawatts of new generation resources; and

&nbsp;&nbsp;&nbsp;&nbsp;· decreased costs related to accelerating the return to customers of investment tax credits.

The MoPSC proceeding relating to the proposed electric service rate changes will take place over a period of up to 11 months, with a decision by the MoPSC expected by May 2027 and new rates effective by June 2027. Ameren Missouri cannot predict the level of any electric service rate change the MoPSC may approve, whether the requested regulatory recovery mechanisms will be continued, or whether any rate change that may eventually be approved will be sufficient for Ameren Missouri to recover its costs and earn a reasonable return on its investments when any rate change goes into effect.

This combined Form 8-K is being filed separately by Ameren Corporation and Union Electric Company (each a "registrant"). Information contained herein relating to any individual registrant has been filed by such registrant on its own behalf. No registrant makes any representation as to information relating to any other registrant.

**SIGNATURES**

Pursuant to the requirements of the Securities Exchange Act of 1934, each registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. The signature for each undersigned company shall be deemed to relate only to matters having reference to such company or its subsidiaries.

---

| | |
|:---|:---|
| AMEREN CORPORATION | AMEREN CORPORATION |
| (Registrant) | (Registrant) |
| By: | /s/ Leonard P. Singh |
| Name: | Leonard P. Singh |
| Title: | Executive Vice President and Chief Financial Officer |
| UNION ELECTRIC COMPANY | UNION ELECTRIC COMPANY |
| (Registrant) | (Registrant) |
| By: | /s/ Aaron P. Melda |
| Name: | Aaron P. Melda |
| Title: | Chairman and President |

---

Date: June 26, 2026