AEE · Ameren Corp · Debt

On March 4, 2026, Ameren Corporation (“Ameren”) sold $400 million principal amount of its 5.00% Senior Notes due 2036 (the “Notes”). The Notes were offered pursuant to a Registration Statement on Form S-3 (File No. 333-274977), which became effective on October 13, 2023, and a Prospectus Supplement dated February 26, 2026, to a Prospectus dated October 13, 2023. Ameren received net offering proceeds of approximately $396.6 million, before expenses, upon closing of the transaction.

Issuer evidence: On March 4, 2026, Ameren Corporation (“Ameren”) sold $400 million principal amount of its 5.00% Senior Notes due 2036 (the “Notes”). The Notes were offered pursuant to a Registration Statement on Form S-3 (File No. 333-274977), which became effective on October 13, 2023, and a Prospectus Supplement dated February 26, 2026, to a Prospectus dated October 13, 2023. Ameren received net offering proceeds of approximately $396.6 million, before expenses, upon closing of the transaction.

Supporting evidence: On March 4, 2026, Ameren Corporation (“Ameren”) sold $400 million principal amount of its 5.00% Senior Notes due 2036 (the “Notes”).

On September 18, 2026, Ameren Corporation (“Ameren”) sold $900 million principal amount of its Junior Subordinated Notes due 2057 (the “Notes”). The Notes were offered pursuant to a Registration Statement on Form S-3 (File No. 333-297949), which became effective on August 4, 2026, and a Prospectus Supplement dated September 8, 2026, to a Prospectus dated August 4, 2026. Ameren received net offering proceeds of $891.0 million, before expenses, upon closing of the transaction.

Issuer evidence: On September 18, 2026, Ameren Corporation (“Ameren”) sold $900 million principal amount of its Junior Subordinated Notes due 2057 (the “Notes”).

Supporting evidence: On September 18, 2026, Ameren Corporation (“Ameren”) sold $900 million principal amount of its Junior Subordinated Notes due 2057 (the “Notes”).

Supporting evidence: On September 18, 2026, Ameren Corporation (“Ameren”) sold $900 million principal amount of its Junior Subordinated Notes due 2057 (the “Notes”).

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.

Issuer evidence: 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”).

Supporting evidence: 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”).

Section 1. There is hereby created a new series of Bonds to be executed, authenticated and delivered under and secured by the Original Indenture which shall, subject to the provisions of Section 1 of Article II of the Original Indenture, be designated as “5.75% First Mortgage Bonds due 2056” (the “New Bonds”) of the Company. The New Bonds shall be executed, authenticated and delivered in accordance with the provisions of, and shall in all respects be subject to all of the terms, conditions and covenants of, the Original Indenture.

Issuer evidence: **SUPPLEMENTAL INDENTURE**, dated the 1st day of June, Two thousand and twenty-six (2026) made by and between UNION ELECTRIC COMPANY, a corporation organized and existing under the laws of the State of Missouri (hereinafter called the “Company”), party of the first part, and The Bank of New York Mellon, formerly The Bank of New York (successor trustee to Bank of America, National Association, formerly Boatmen’s Trust Company), a bank existing under the laws of the State of New York (hereinafter called the “Trustee”), as Trustee under the Indenture of Mortgage and Deed of Trust dated June 15, 1937, hereinafter mentioned, party of the second part:

Supporting evidence: Section 1. There is hereby created a new series of Bonds to be executed, authenticated and delivered under and secured by the Original Indenture which shall, subject to the provisions of Section 1 of Article II of the Original Indenture, be designated as “5.75% First Mortgage Bonds due 2056” (the “New Bonds”) of the Company. The New Bonds shall be executed, authenticated and delivered in accordance with the provisions of, and shall in all respects be subject to all of the terms, conditions and covenants of, the Original Indenture.

Supporting evidence: Section 1. There is hereby created a new series of Bonds to be executed, authenticated and delivered under and secured by the Original Indenture which shall, subject to the provisions of Section 1 of Article II of the Original Indenture, be designated as “5.75% First Mortgage Bonds due 2056” (the “New Bonds”) of the Company. The New Bonds shall be executed, authenticated and delivered in accordance with the provisions of, and shall in all respects be subject to all of the terms, conditions and covenants of, the Original Indenture.

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”).

Issuer evidence: 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”).

Supporting evidence: 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”).