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Ameren Illinois sells $400M 5.50% bonds due 2036

Ameren Illinois Co (symbol AILIH), a subsidiary of Ameren Corporation, issued $400 million principal amount of its 5.50% First Mortgage Bonds due 2036 on August 24, 2026.

Filing Impact
(High)
Filing Sentiment
(Neutral)
Form Type
8-K

Rhea-AI Filing Summary

Ameren Illinois Co (symbol AILIH), a subsidiary of Ameren Corporation, issued $400 million principal amount of its 5.50% First Mortgage Bonds due 2036 on August 24, 2026. The bonds were sold under an effective Registration Statement on Form S-3 and related prospectus and prospectus supplement.

Ameren Illinois received approximately $397.4 million in net offering proceeds, before expenses. The company also listed as exhibits the underwriting agreement, the general mortgage indenture and deed of trust, a supplemental indenture for these bonds, and legal opinions confirming the bonds’ validity.

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Item 8.01 Other Events Other
Voluntary disclosure of events the company deems important to shareholders but not covered by other items.
Item 9.01 Financial Statements and Exhibits Exhibits
Financial statements, pro forma financial information, or exhibit attachments filed with this report.
Principal amount of First Mortgage Bonds $400 million 5.50% First Mortgage Bonds due 2036 issued by Ameren Illinois on August 24, 2026
Coupon rate 5.50% Interest rate on Ameren Illinois First Mortgage Bonds due 2036
Net offering proceeds $397.4 million Net proceeds to Ameren Illinois from the bond issuance, before expenses
Form S-3 effectiveness date August 4, 2026 Date the Registration Statement on Form S-3 became effective
Prospectus Supplement date August 17, 2026 Date of the prospectus supplement used for the bond offering
General Mortgage Indenture date November 1, 1992 Original date of the general mortgage indenture and deed of trust referenced for the bonds
First Mortgage Bonds financial
"sold $400 million principal amount of its 5.50% First Mortgage Bonds due 2036"
First mortgage bonds are debt securities backed by a company’s property, granting bondholders the primary legal claim to that real estate if the issuer cannot pay. Think of them as being first in line for repayment, like a homeowner’s mortgage lender who gets paid before other creditors. For investors, this priority and the tangible collateral typically make these bonds less risky than unsecured debt, which can mean lower yields but greater protection in bankruptcy.
Registration Statement on Form S-3 regulatory
"The Bonds were offered pursuant to a Registration Statement on Form S-3"
A registration statement on Form S‑3 is a short, standardized filing a qualified public company uses to register new securities with regulators so they can be sold to investors; think of it as a pre-approved, reusable permission slip that speeds up future offerings. It matters to investors because it lets the company raise money more quickly and cheaply — which can fund growth or pay debt — but may also lead to share dilution or change in ownership, so it affects value and liquidity.
Prospectus Supplement regulatory
"and a Prospectus Supplement dated August 17, 2026, to a Prospectus"
A prospectus supplement is an additional document provided alongside a company's main offering details, offering updated or extra information about a specific financial product being sold. It helps investors understand the latest terms, risks, and details of the investment, similar to how an update or revision clarifies or expands on original instructions, ensuring they have current and complete information before making a decision.
Supplemental Indenture financial
"Supplemental Indenture, dated as of August 1, 2026, by and between Ameren Illinois"
A supplemental indenture is a written amendment to the original bond agreement that changes specific terms of a debt contract, such as payment schedules, interest rates, collateral or covenant protections. Investors care because it alters the legal rights and risks tied to a security — like renegotiating a mortgage where the lender and borrower agree to new rules — and can affect a bond’s credit quality, yield and market value.
Inline XBRL technical
"Cover Page Interactive Data File (formatted as Inline XBRL)"
Inline XBRL is a file format for financial filings that embeds machine-readable data tags directly inside the human-readable report, so the same document can be read by people and parsed by software. For investors it makes extracting, comparing and verifying financial numbers faster and more reliable—like a grocery list where each item also has a barcode—reducing manual errors and speeding up analysis.
Offering Type shelf

FAQ

What financing transaction did Ameren Illinois Co (AILIH) report in this Form 8-K?
Ameren Illinois Co reported issuing $400 million principal amount of 5.50% First Mortgage Bonds due 2036 on August 24, 2026, under an effective Form S-3 shelf registration and related prospectus documents.

What interest rate and maturity apply to the new Ameren Illinois (AILIH) bonds?
The new Ameren Illinois bonds carry a fixed coupon of 5.50% and mature in 2036, as First Mortgage Bonds due 2036 issued on August 24, 2026.

How much in net proceeds did Ameren Illinois (AILIH) receive from the bond sale?
Ameren Illinois received approximately $397.4 million in net offering proceeds, before expenses, from the sale of $400 million principal amount of its 5.50% First Mortgage Bonds due 2036.

Under what registration statement were the Ameren Illinois (AILIH) bonds offered?
The bonds were offered pursuant to a Registration Statement on Form S-3 (File No. 333-297949-01), which became effective on August 4, 2026, along with a prospectus dated August 4, 2026 and a prospectus supplement dated August 17, 2026.

Which key transaction documents did Ameren Illinois (AILIH) file as exhibits?
Ameren Illinois filed the underwriting agreement, the general mortgage indenture and deed of trust, a supplemental indenture relating to the bonds, and legal opinions from its general counsel and from Morgan, Lewis & Bockius LLP regarding the legality of the bonds.

Who served as representatives of the underwriters for the Ameren Illinois (AILIH) bond offering?
Goldman Sachs & Co. LLC, KeyBanc Capital Markets Inc., SMBC Nikko Securities America, Inc. and TD Securities (USA) LLC acted as representatives of the underwriters under the August 17, 2026 underwriting agreement.

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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): August 24, 2026

   

 

 

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

1-3672  

Ameren Illinois Company

(Illinois Corporation)

10 Richard Mark Way

Collinsville, Illinois 62234

(618) 343-8150

   37-0211380

 

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 ¨  
Ameren Illinois 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 ¨  
Ameren Illinois Company ¨  

 

 

Co-Registrant CIK 0000100826
Co-Registrant Amendment Flag false
Co-Registrant Form Type 8-K
Co-Registrant DocumentperiodEndDate 2026-08-24
Co-Registrant Written Commuunications false
Co-Registrant Solicitating Materials false
Co-Registrant PreCommencement Tender Offer false
Co-Registrant PreCommencement Tender Offer false
Co-Registrant Entity PreCommencement Issuer Tender Offer false

 

 

 

 

ITEM 8.01Other Events.

 

On August 24, 2026, Ameren Illinois Company (“Ameren Illinois”), a subsidiary of Ameren Corporation, sold $400 million principal amount of its 5.50% First Mortgage Bonds due 2036 (the “Bonds”). The Bonds were offered pursuant to a Registration Statement on Form S-3 (File No. 333-297949-01), which became effective on August 4, 2026, and a Prospectus Supplement dated August 17, 2026, to a Prospectus dated August 4, 2026. Ameren Illinois received net offering proceeds of approximately $397.4 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 9.01Financial Statements and Exhibits.

 

(d)Exhibits

 

Exhibit Number Title
1.1Underwriting Agreement relating to the Bonds, dated August 17, 2026, between Ameren Illinois and the several underwriters named therein, for whom Goldman Sachs & Co. LLC, KeyBanc Capital Markets Inc., SMBC Nikko Securities America, Inc. and TD Securities (USA) LLC 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).
  
4.2Supplemental Indenture, dated as of August 1, 2026, by and between Ameren Illinois and The Bank of New York Mellon Trust Company, N.A., as successor trustee, relating to the Bonds.
  
5.1Opinion of David M. Feinberg, Esq., Executive Vice President, General Counsel and Secretary of Ameren Illinois, regarding the legality of the Bonds (including consent).
  
5.2Opinion of Morgan, Lewis & Bockius LLP regarding the legality of the Bonds (including consent).
  
104Cover 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 hereunto 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/ Leonard P. Singh
  Name: Leonard P. Singh
  Title: Executive Vice President and Chief Financial Officer
   
  AMEREN ILLINOIS COMPANY
  (Registrant)
   
  By: /s/ Patrick E. Smith Sr.
  Name: Patrick E. Smith Sr.
  Title: Chairman and President

  

Date: August 24, 2026

 

 

 

Source: View Original Filing on SEC EDGAR

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