Company: AILIM
Filing Date: 2025-09-16
Form Type: 424B2
Source: 0001104659-25-090464
Chunk: 0

Company: Ameren Illinois Co
Filing Date: 2025-09-16
Form: 424B2
Chunk 0
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TABLE OF CONTENTS

Filed Pursuant to Rule 424(b)(2) Registration Statement No. 333-274977-01 PROSPECTUS SUPPLEMENT
(To Prospectus dated October 13, 2023) $350,000,000 5.625% First Mortgage Bonds due 2055 Ameren Illinois Company, doing business as Ameren Illinois, is offering $350,000,000 principal amount of its 5.625% First Mortgage Bonds due 2055, referred to in this prospectus supplement as the “bonds.” The bonds will be a further issuance of, will be fungible with, will have the same CUSIP number as and will be consolidated and form a single series with, our 5.625% First Mortgage Bonds due 2055 issued on March 3, 2025, in the principal amount of $350 million, which we refer to as the “original bonds.” The bonds will mature on March 1, 2055. We will pay interest on the bonds semi-annually in arrears on March 1 and September 1 of each year. The first such payment will be made on March 1, 2026. Interest will accrue on the bonds offered by this prospectus supplement from September 1, 2025, the most recent date on which interest has been paid on the original bonds. Upon the issuance of the bonds, the aggregate principal amount of outstanding 5.625% First Mortgage Bonds due 2055 will be $700,000,000. The bonds will be issued only in minimum denominations of $2,000 and integral multiples of $1,000 in excess thereof. We may at any time and from time to time redeem at our option all or a portion of the bonds at the applicable redemption price set forth in this prospectus supplement under “Description of Bonds — Redemption.” As described in the accompanying prospectus and this prospectus supplement, the bonds are a series of first mortgage bonds issued under our mortgage indenture, which will be secured by the lien of our mortgage indenture, which, subject to certain exceptions, is a first lien on substantially all of our properties, equally with all other outstanding and future first mortgage bonds. See “Description of First Mortgage Bonds and Mortgage Indenture — Priority and Security” in the accompanying prospectus. We do not intend to apply for listing of the bonds on any securities exchange. Investing in the bonds involves risks. See “Risk Factors” on page S