UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

~~of the~~ Securities Exchange Act of 1934

Date of report (Date of earliest event reported): June ~~December 12~~27, ~~2014~~ 2024

Commission File Number	Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number	~~Exact~~IRS ~~Name~~Employer ofIdentification ~~Registrant as Specified in Charter; State of Incorporation; Address and Telephone~~ Number	~~IRS Employer Identification Number~~
1-2967		Union Electric Company (Missouri Corporation) 1901 Chouteau Avenue St. Louis, Missouri 63103 (314) 621-3222	43-0559760
1-14756	Ameren Corporation (Missouri Corporation) 1901 Chouteau Avenue St. Louis, Missouri 63103 (314) 621-3222	43-1723446
1-3672	Ameren Illinois Company (Illinois Corporation) 10 Richard Mark Way Collinsville, Illinois 62234 (618) 343-8150	~~Ameren Illinois Company (Illinois Corporation) 6 Executive Drive Collinsville, Illinois 62234 (618) 343~~37-~~8150~~0211380	~~37-0211380~~

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the ~~registrant~~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))

~~Item~~Securities ~~5.03~~registered pursuant ~~Amendments~~ to ~~Articles~~ Section 12(b) of ~~Incorporation~~the ~~or Bylaws; Change in Fiscal Year.~~Act:

On December 12, 2014, the Bylaws of Union Electric Company, doing business as Ameren Missouri (“Ameren Missouri”), a subsidiary of Ameren Corporation (“Ameren”), were amended by action by unanimous written consent of Ameren Missouri’s Board of Directors. The amendments eliminate the separate title of Chief Executive Officer at Ameren Missouri. Michael L. Moehn will continue to serve as President of Ameren Missouri and will have the same duties and responsibilities as before the elimination of the title of Chief Executive Officer.

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

AIndicate ~~complete~~by ~~copy~~check ofmark whether the ~~Ameren~~registrant ~~Missouri~~is ~~Bylaws,~~an emerging growth company as ~~amended,~~defined isin ~~included~~Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities asExchange ~~Exhibit~~Act 3of 1934 (§240.1.12b-2 of this chapter).

OnEmerging ~~December 12,~~growth ~~2014,~~company ~~the~~Ameren ~~Bylaws~~Corporation of¨ Ameren Illinois Company (“Ameren Illinois”), a subsidiary of Ameren, were amended by action by unanimous written consent of Ameren Illinois’ Board of Directors. The amendments eliminate the separate title of Chief Executive Officer at Ameren Illinois. Richard J. Mark will continue to serve as President of Ameren Illinois and will have the same duties and responsibilities as before the elimination of the title of Chief Executive Officer. ¨

AIf ~~complete~~an emerging growth ~~copy~~company, ofindicate by check mark if the ~~Ameren~~registrant ~~Illinois~~has ~~Bylaws,~~elected asnot ~~amended,~~to isuse ~~included~~the asextended ~~Exhibit~~transition ~~3.2.~~period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.

~~Item~~Ameren ~~9.01~~Corporation ~~Financial~~¨ ~~Statements~~Ameren ~~and~~Illinois ~~Exhibits.~~Company ¨

ITEM 8.01

Other Events.

On June 27, 2024, Ameren Illinois Company (“Ameren Illinois”), a subsidiary of Ameren Corporation, sold $625 million principal amount of its 5.55% First Mortgage Bonds due 2054 (the “Bonds”). The Bonds were offered pursuant to a Registration Statement on Form S-3 (File No. 333-274977-01), which became effective on October 13, 2023, and a Prospectus Supplement dated June 17, 2024, to a Prospectus dated October 13, 2023. Ameren Illinois received net offering proceeds of approximately $618.3 million, before expenses, upon closing of the transaction.

This Current Report on Form 8-K is being filed to report as exhibits certain documents in connection with the offering of the Bonds.

ITEM 9.01

Financial Statements and Exhibits.

(d)

Exhibits

Exhibit Number		Title
3.1		Bylaws of Union Electric Company, as amended December 12, 2014
3.2		Bylaws of Ameren Illinois Company, as amended December 12, 2014

Exhibit Number

Title

~~This~~1.1 ~~combined~~Underwriting ~~Form~~Agreement ~~8-K~~relating isto ~~being~~the ~~filed~~Bonds, ~~separately~~dated byJune ~~Union~~17, ~~Electric~~2024, ~~Company~~between ~~and~~ Ameren Illinois ~~Company.~~and ~~Information~~the ~~contained~~several ~~herein~~underwriters ~~relating to~~named ~~any~~therein, ~~individual~~for ~~registrant~~whom ~~has~~Barclays ~~been~~Capital ~~filed~~Inc., byMUFG ~~such~~Securities ~~registrant~~Americas onInc., ~~its~~Scotia ~~own~~Capital ~~behalf~~(USA) Inc., NoTD ~~registrant~~Securities ~~makes~~(USA) ~~any~~LLC ~~representation~~and asWells toFargo ~~information~~Securities, ~~relating~~LLC toare ~~any~~acting ~~other~~as ~~registrant~~representatives.

4.1*	General Mortgage Indenture and Deed of Trust, dated as of November 1, 1992, from Ameren Illinois to The Bank of New York Mellon Trust Company, N.A., as successor trustee (1992 Form 10-K, Exhibit 4(cc), File No. 1-3004).

4.2	Supplemental Indenture, dated as of June 1, 2024, by and between Ameren Illinois and The Bank of New York Mellon Trust Company, N.A., as successor trustee, relating to the Bonds.

5.1	Opinion of Stephen C. Lee, Esq., Vice President and Deputy General Counsel of Ameren Illinois, regarding the legality of the Bonds (including consent).

5.2	Opinion of Morgan, Lewis & Bockius LLP regarding the legality of the Bonds (including consent).

104	Cover Page Interactive Data File (formatted as Inline XBRL).

* Incorporated by reference as indicated.

This combined Form 8-K is being filed separately by Ameren Corporation and Ameren Illinois 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.

~~UNION~~AMEREN ~~ELECTRIC~~CORPORATION ~~COMPANY~~ (Registrant) By: /s/ ~~Martin~~Michael JL. ~~Lyons,~~Moehn ~~Jr.~~ Name: ~~Martin~~Michael JL. ~~Lyons,~~Moehn ~~Jr.~~ Title: Senior Executive Vice President and Chief Financial Officer AMEREN ILLINOIS COMPANY (Registrant) By: /s/ ~~Martin~~Leonard JP. ~~Lyons,~~Singh ~~Jr.~~ Name: ~~Martin~~Leonard JP. ~~Lyons,~~Singh ~~Jr.~~ Title: ~~Executive~~Chairman ~~Vice President~~ and ~~Chief Financial Officer~~President

Date: ~~December~~June 1827, ~~2014~~ 2024

Exhibit Index

Exhibit Number		Title
3.1		Bylaws of Union Electric Company, as amended December 12, 2014
3.2		Bylaws of Ameren Illinois Company, as amended December 12, 2014

Co-Registrant CIK	0000018654
Co-Registrant Amendment Flag	false
Co-Registrant Form Type	8-K
Co-Registrant DocumentperiodEndDate	2024-06-27
Co-Registrant Written Commuunications	false
Co-Registrant Solicitating Materials	false
Co-Registrant PreCommencement Tender Offer	false
Co-Registrant Entity PreCommencement Issuer Tender Offer	false

Filing Compare · Ameren Illinois Co