Union Electric Company (Ameren Missouri) issued $900 million in First Mortgage Bonds. This includes $450 million of 4.80% First Mortgage Bonds due March 15, 2036. This also includes $450 million of 5.55% First Mortgage Bonds due March 15, 2056. The bonds were offered pursuant to a Registration Statement on Form S-3, which became effective on October 13, 2023, and a Prospectus Supplement dated February 23, 2026. Aggregate net offering proceeds received by Ameren Missouri were approximately $891.1 million before expenses. The bonds are secured by the company's permanent, fixed properties, including power houses, plants, transmission, and distribution systems across various counties in Missouri, Illinois, and Iowa.