AMEREN CORP 8-K

What Happened
Ameren Corporation reported that its subsidiary Union Electric Company (doing business as Ameren Missouri) completed a debt offering on February 27, 2026, selling $450 million of 4.80% First Mortgage Bonds due 2036 and $450 million of 5.55% First Mortgage Bonds due 2056 (total $900 million). The bonds were offered under a Form S-3 registration statement (effective October 13, 2023) and a prospectus supplement dated February 23, 2026. Ameren Missouri received approximately $891.1 million in aggregate net offering proceeds, before expenses. The 8‑K was filed to report related offering documents and opinions.

Key Details

• Amounts issued: $450M of 4.80% bonds due 2036 and $450M of 5.55% bonds due 2056 (total $900M).
• Net proceeds: approximately $891.1 million (before expenses) upon closing on February 27, 2026.
• Offering documents: Registered on Form S‑3 (File No. 333-274977-02); prospectus supplement dated February 23, 2026.
• Underwriters: syndicate led by Barclays, BofA Securities, Mizuho Securities USA, MUFG Securities Americas, and Wells Fargo Securities (as representatives).

Why It Matters
This transaction raises significant long-term capital for Ameren Missouri and affects Ameren’s consolidated debt profile and future interest obligations (fixed coupons of 4.80% and 5.55%). For investors, the filing confirms the debt financing is completed and funded, and the company has documented legal opinions and indenture supplements as part of the offering.