Ameren Corp Sells $900M Junior Subordinated Notes Due 2057

What Happened
Ameren Corporation announced on September 18, 2026 that it sold $900 million principal amount of junior subordinated notes due 2057. The offering closed under a Registration Statement on Form S-3 (effective August 4, 2026) and a Prospectus Supplement dated September 8, 2026. Ameren received net offering proceeds of $891.0 million, before expenses. The company filed this Form 8‑K to report the transaction and related offering documents.

Key Details

• Sale date: September 18, 2026; Principal amount: $900,000,000.
• Maturity: notes due in 2057 (long-term, junior subordinated status).
• Net proceeds: $891.0 million (before expenses).
• Offering conducted under Form S-3 (effective Aug 4, 2026) with a Prospectus Supplement dated Sept 8, 2026; related indenture and offering documents were filed as exhibits.

Why It Matters
This transaction raises long-term capital for Ameren by adding junior subordinated debt with a far‑future maturity, which affects the company’s capital structure and future interest obligations. Because the notes are subordinated, they rank below the company’s senior indebtedness. Retail investors should note the size of the issuance ($900M) and net proceeds ($891M) when evaluating Ameren’s leverage and credit profile; the filed exhibits (indenture and legal opinions) provide the formal terms and documentation.