Ameren Corporation filed a Form 8-K with the SEC on September 18, 2026, reporting the sale of $900 million principal amount of Junior Subordinated Notes due 2057 and attaching related transaction documents as exhibits.

Key Highlights

  • Offering size: Ameren sold $900 million principal amount of Junior Subordinated Notes due 2057.
  • Net proceeds: Ameren received net offering proceeds of $891.0 million, before expenses, upon closing.
  • Closing date: The transaction closed on September 18, 2026.
  • Registration: The Notes were offered under a Registration Statement on Form S-3 (File No. 333-297949), which became effective on August 4, 2026.
  • Prospectus Supplement: A Prospectus Supplement dated September 8, 2026 was used, together with a Prospectus dated August 4, 2026.
  • Underwriter representatives: Barclays Capital Inc., BofA Securities, Inc., J.P. Morgan Securities LLC, Morgan Stanley & Co. LLC, MUFG Securities Americas Inc., and Truist Securities, Inc. acted as representatives for the underwriters.
  • Trustee: The Bank of New York Mellon Trust Company, N.A. serves as trustee under the Ameren Indenture dated September 1, 2026.

Ameren's $900 Million Junior Subordinated Notes Offering: Key Details

According to the filing, Ameren Corporation (NYSE:AEE) completed the sale of $900 million in principal amount of Junior Subordinated Notes due 2057 on September 18, 2026. The company disclosed that net offering proceeds totaled $891.0 million, before expenses. The Notes were issued pursuant to a Registration Statement on Form S-3 carrying File No. 333-297949, which the filing states became effective on August 4, 2026.

The offering was conducted under a Prospectus dated August 4, 2026, supplemented by a Prospectus Supplement dated September 8, 2026. An Underwriting Agreement, also dated September 8, 2026, was entered into between Ameren and the several underwriters named therein. The filing identifies Barclays Capital Inc., BofA Securities, Inc., J.P. Morgan Securities LLC, Morgan Stanley & Co. LLC, MUFG Securities Americas Inc., and Truist Securities, Inc. as acting representatives for the underwriting group.

The filing further discloses that an Indenture was entered into as of September 1, 2026, between Ameren and The Bank of New York Mellon Trust Company, N.A., as trustee. A Company Order establishing the Notes was dated September 18, 2026. The 8-K was signed by Leonard P. Singh, Executive Vice President and Chief Financial Officer of Ameren, and was filed to report as exhibits certain documents in connection with the offering.

What Was Disclosed

Ameren Corporation disclosed the completion of a $900 million Junior Subordinated Notes offering due 2057, reporting $891.0 million in net proceeds before expenses, along with the filing of related transaction documents including the indenture, underwriting agreement, and legal opinions.