Ameren Corp. Files 8-K with Subsidiary Details

TL;DR

Ameren filed an 8-K on 9/26/25, updating corporate info for itself and Ameren Illinois.

AI Summary

Ameren Corp. filed an 8-K on September 26, 2025, reporting other events and financial statements. The filing includes information for Ameren Illinois Co., a subsidiary incorporated in Illinois, which was formerly known as Central Illinois Public Service Co. before a name change on July 3, 1992.

Why It Matters

This filing provides updated corporate information and financial reporting for Ameren Corp. and its subsidiary, Ameren Illinois Co., which is important for investors tracking the company's structure and regulatory compliance.

Risk Assessment

Risk Level: low — The filing is a routine corporate disclosure and does not appear to contain any material adverse information.

Key Players & Entities

• AMEREN CORP (company) — Filer
• Ameren Illinois Co (company) — Subsidiary Filer
• CENTRAL ILLINOIS PUBLIC SERVICE CO (company) — Former Name of Ameren Illinois Co
• 19920703 (date) — Date of Name Change
• 20250926 (date) — Filing Date

FAQ

Key Financial Figures

• $0.01 — ange on which registered Common Stock, $0.01 par value per share AEE New York St
• $350 million — subsidiary of Ameren Corporation, sold $350 million principal amount of its 5.625% First Mo
• $358.1 m — net offering proceeds of approximately $358.1 million, before expenses, upon closing of

Filing Documents

• tm2526883d1_8k.htm (8-K) — 48KB
• tm2526883d1_ex1-1.htm (EX-1.1) — 193KB
• tm2526883d1_ex5-1.htm (EX-5.1) — 9KB
• tm2526883d1_ex5-2.htm (EX-5.2) — 9KB
• tm2526883d1_ex5-1img001.jpg (GRAPHIC) — 3KB
• tm2526883d1_ex5-2img001.jpg (GRAPHIC) — 3KB
• tm2526883d1_ex5-2img002.jpg (GRAPHIC) — 1KB
• tm2526883d1_ex5-2img003.jpg (GRAPHIC) — 1KB
• tm2526883d1_ex5-1img003.jpg (GRAPHIC) — 12KB
• 0001104659-25-093779.txt ( ) — 546KB
• aee-20250926.xsd (EX-101.SCH) — 3KB
• aee-20250926_def.xml (EX-101.DEF) — 26KB
• aee-20250926_lab.xml (EX-101.LAB) — 35KB
• aee-20250926_pre.xml (EX-101.PRE) — 24KB
• tm2526883d1_8k_htm.xml (XML) — 7KB

01 Other Events

ITEM 8.01 Other Events. On September 26, 2025, Ameren Illinois Company ("Ameren Illinois"), a subsidiary of Ameren Corporation, sold $350 million principal amount of its 5.625% First Mortgage Bonds due 2055 (the "Bonds"). These Bonds are a further issuance of the 5.625% First Mortgage Bonds due 2055 previously issued on March 3, 2025, in the principal amount of $350 million. 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 September 15, 2025, to a Prospectus dated October 13, 2023. Ameren Illinois received net offering proceeds of approximately $358.1 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.

01 Financial Statements and Exhibits

ITEM 9.01 Financial Statements and Exhibits. (d) Exhibits Exhibit Number Title 1.1 Underwriting Agreement relating to the Bonds, dated September 15, 2025, between Ameren Illinois and the several underwriters named therein, for whom KeyBanc Capital Markets Inc., TD Securities (USA) LLC and U.S. Bancorp Investments, Inc. are acting as 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 February 1, 2025, by and between Ameren Illinois and The Bank of New York Mellon Trust Company, N.A., as successor trustee, relating to the Bonds (March 3, 2025 Form 8-K, Exhibit 4.2, File No. 1-3672). 5.1 Opinion of Stephen C. Lee, Esq., Vice President, Interim General Counsel and Secretary 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

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 AMEREN ILLINOIS COMPANY (Registrant) By: /s/ Leonard P. Singh Name: Leonard P. Singh Title: Chairman and President Date: September 26, 2025

View Full Filing

View this 8-K filing on SEC EDGAR