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): April 7, 2023

Commission File Number

Exact Name of Registrant as
Specified in Charter;

State of Incorporation;

Address and Telephone Number

IRS Employer

Identification Number

1-14756

Ameren Corporation

(Missouri Corporation)

1901 Chouteau Avenue

St. Louis, Missouri 63103

(314) 621-3222

43-1723446

1-2967

Union Electric Company

(Missouri Corporation)

1901 Chouteau Avenue

St. Louis, Missouri 63103

(314) 621-3222

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:

Title of each class		Trading Symbol(s)		Name of each exchange on which registered
Common Stock, $0.01 par value per share		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
Ameren Corporation	¨
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	¨
Union Electric Company	¨

ITEM 8.01

Other Events.

Reference is made to Note 2 – Rate and Regulatory Matters to the financial statements under Part II, Item 8. Financial Statements and to Overview and Outlook under Part II, Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations, each in the Annual Report on Form 10-K for the year ended December 31, 2022 (“Form 10-K”), of registrants Ameren Corporation and Union Electric Company, doing business as Ameren Missouri (“Ameren Missouri”), for a discussion of Ameren Missouri’s electric service regulatory rate review filed with the Missouri Public Service Commission (“MoPSC”) in August 2022.

On April 7, 2023, Ameren Missouri, the staff of the MoPSC, the Missouri Office of Public Counsel, and certain other intervenors filed a nonunanimous stipulation and agreement with the MoPSC. The stipulation and agreement, which is subject to MoPSC approval, would result in a $140 million increase to Ameren Missouri’s annual revenue requirement for electric service compared to its prior revenue requirement established in the MoPSC's December 2021 electric rate order. The stipulation and agreement did not specify an allowed return on equity or common equity ratio. The stipulation and agreement also did not specify a rate base amount or any rate base disallowances.

The stipulation and agreement includes the continued use of the fuel adjustment clause and the regulatory tracking mechanisms for pension and postretirement benefits, uncertain income tax positions, certain excess deferred income taxes, and renewable energy standard costs that the MoPSC previously authorized in earlier electric rate orders. These regulatory tracking mechanisms provide for a base level of expense to be reflected in Ameren Missouri’s base electric rates with differences in the actual expenses incurred recorded as a regulatory asset or liability.

New rates reflecting the stipulation and agreement are expected to become effective on July 1, 2023. Ameren Missouri cannot predict whether the MoPSC will approve the stipulation and agreement or, if approved, whether any application for rehearing or appeal will be filed or the outcome if so filed.

This combined Form 8-K is being filed separately by Ameren Corporation and Union Electric Company. 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
	(Registrant)

	By:	/s/ Michael L. Moehn
	Name:	Michael L. Moehn
	Title:	Senior Executive Vice President and Chief Financial Officer


	UNION ELECTRIC COMPANY
	(Registrant)

	By:	/s/ Mark C. Birk
	Name:	Mark C. Birk
	Title:	Chairman and President

Date: April 7, 2023

Co-Registrant CIK	0000100826
Co-Registrant Amendment Flag	false
Co-Registrant Form Type	8-K
Co-Registrant DocumentperiodEndDate	2023-04-07
Co-Registrant Written Commuunications	false
Co-Registrant Solicitating Materials	false
Co-Registrant PreCommencement Tender Offer	false
Co-Registrant Entity PreCommencement Issuer Tender Offer	false

Ameren Corporation filed SEC Form 8-K: Other Events