Ameren Missouri sells $500M 5.75% bonds due 2056

Q: What did Ameren Missouri (AEE) announce in this Form 8-K?

Ameren Missouri disclosed it sold $500 million of 5.75% First Mortgage Bonds due 2056. The filing mainly provides the underwriting agreement and related documents connected with this long-term bond issuance.

Q: What are the key terms of Ameren Missouri’s new bonds?

The new Ameren Missouri bonds have a $500 million principal amount, a fixed 5.75% coupon, and mature in 2056. They are issued as First Mortgage Bonds, which are typically secured by utility assets.

Q: Under what registration did Ameren Missouri issue the 2056 bonds?

The bonds were issued under a Form S-3 shelf registration statement, File No. 333-274977-02. A Prospectus Supplement dated June 15, 2026 and a base Prospectus dated October 13, 2023 govern the offering terms.

Ameren Missouri, a subsidiary of Ameren Corporation, has issued $500 million principal amount of 5.75% First Mortgage Bonds due 2056.

Filing Impact

(High)

Filing Sentiment

(Neutral)

Form Type

8-K

Rhea-AI Filing Summary

Ameren Missouri, a subsidiary of Ameren Corporation, has issued $500 million principal amount of 5.75% First Mortgage Bonds due 2056. The bonds were sold under an existing shelf registration on Form S-3 and a June 15, 2026 prospectus supplement.

Ameren Missouri received approximately $492.2 million in net proceeds from the transaction, before expenses. The report primarily provides the underwriting agreement and related documents as exhibits connected to this long-term financing.

Insights

Ameren Missouri adds long-dated fixed-rate debt to support capital needs.

The issuance of $500 million of 5.75% First Mortgage Bonds due 2056 extends Ameren Missouri’s debt maturity profile at a fixed coupon. Net proceeds of about $492.2 million before expenses increase balance-sheet leverage but also provide fresh long-term capital.

Because the bonds are first mortgage obligations, they are secured by utility assets, consistent with typical regulated utility financing. Actual impact on credit metrics and future rate-setting will depend on how the proceeds are ultimately applied, which is not detailed in this excerpt.

8-K Event Classification

2 items: 8.01, 9.01

2 items

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.

Key Figures

Bond principal: $500 million Coupon rate: 5.75% Net proceeds: $492.2 million +2 more

5 metrics

Bond principal $500 million First Mortgage Bonds due 2056 issued by Ameren Missouri

Coupon rate 5.75% Interest rate on Ameren Missouri First Mortgage Bonds due 2056

Net proceeds $492.2 million Net offering proceeds to Ameren Missouri before expenses

Shelf registration form Form S-3, File No. 333-274977-02 Registration statement under which the bonds were offered

Prospectus supplement date June 15, 2026 Date of prospectus supplement governing bond offering terms

Key Terms

First Mortgage Bonds, Registration Statement on Form S-3, Prospectus Supplement, underwriting agreement

4 terms

First Mortgage Bonds financial

"sold $500 million principal amount of its 5.75% First Mortgage Bonds due 2056"

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 (File No. 333-274977-02)"

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 June 15, 2026, to a Prospectus dated October 13, 2023"

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.

underwriting agreement financial

"Underwriting Agreement relating to the Bonds, dated June 15, 2026"

An underwriting agreement is a contract where a company selling new stocks or bonds hires financial firms to buy those securities and resell them to investors. It matters because the agreement sets the offering price, number of securities, fees and which party bears the risk if sales fall short—think of it as a promise that the sale will happen and a roadmap investors can use to understand how the new securities reach the market.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Ameren Missouri (AEE) announce in this Form 8-K?

Ameren Missouri disclosed it sold $500 million of 5.75% First Mortgage Bonds due 2056. The filing mainly provides the underwriting agreement and related documents connected with this long-term bond issuance.

What are the key terms of Ameren Missouri’s new bonds?

The new Ameren Missouri bonds have a $500 million principal amount, a fixed 5.75% coupon, and mature in 2056. They are issued as First Mortgage Bonds, which are typically secured by utility assets.

How much cash did Ameren Missouri receive from the bond sale?

Ameren Missouri received net offering proceeds of approximately $492.2 million from the bond sale, before expenses. The difference from the $500 million principal reflects underwriting discounts and related issuance costs.

Under what registration did Ameren Missouri issue the 2056 bonds?

The bonds were issued under a Form S-3 shelf registration statement, File No. 333-274977-02. A Prospectus Supplement dated June 15, 2026 and a base Prospectus dated October 13, 2023 govern the offering terms.

Which banks underwrote Ameren Missouri’s 5.75% First Mortgage Bonds?

The underwriting agreement lists several underwriters, with Fifth Third Securities, Mizuho Securities USA, TD Securities (USA), Truist Securities, and U.S. Bancorp Investments acting as representatives for the group.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 06/29/2026 - 02:35 PM

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 29, 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

1-2967

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.

On June 29, 2026, Union Electric Company, doing business as Ameren Missouri (“Ameren Missouri”), a subsidiary of Ameren Corporation, sold $500 million principal amount of its 5.75% First Mortgage Bonds due 2056 (the “Bonds”). The Bonds were offered pursuant to a Registration Statement on Form S-3 (File No. 333-274977-02), which became effective on October 13, 2023, and a Prospectus Supplement dated June 15, 2026, to a Prospectus dated October 13, 2023. Ameren Missouri received net offering proceeds of approximately $492.2 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

	1	Underwriting Agreement relating to the Bonds, dated June 15, 2026, between Ameren Missouri and the several underwriters named therein, for whom Fifth Third Securities, Inc., Mizuho Securities USA LLC, TD Securities (USA) LLC, Truist Securities, Inc. and U.S. Bancorp Investments, Inc. are acting as representatives.

4.1*

Indenture of Mortgage and Deed of Trust, dated June 15, 1937, from Ameren Missouri to The Bank of New York Mellon, as successor trustee, as amended May 1, 1941, and Second Supplemental Indenture dated May 1, 1941 (Exhibit B-1, File No. 2-4940).

4.2

Supplemental Indenture, dated June 1, 2026, by and between Ameren Missouri and The Bank of New York Mellon, as successor trustee, relating to the 5.75% First Mortgage Bonds due 2056.

5.1

Opinion of David M. Feinberg, Esq., Executive Vice President, General Counsel and Secretary of Ameren Missouri, 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 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.

- 2 -

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

	UNION ELECTRIC COMPANY
	(Registrant)

	By:	/s/ Aaron P. Melda
	Name:	Aaron P. Melda
	Title:	Chairman and President

Date: June 29, 2026

- 3 -

Source: View Original Filing on SEC EDGAR

Filing Exhibits & Attachments

8 documents

Co-Registrant CIK	0000100826
Co-Registrant Amendment Flag	false
Co-Registrant Form Type	8-K
Co-Registrant DocumentperiodEndDate	2026-02-27
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

Ameren Missouri sells $500M 5.75% bonds due 2056

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