Company: AILIM
Filing Date: 2025-09-16
Form Type: 424B2
Source: 0001104659-25-090464
Chunk: 105

Company: Ameren Illinois Co
Filing Date: 2025-09-16
Form: 424B2
Chunk 105
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 of the State of New York, Mr. Lee will rely on the opinion of Morgan, Lewis & Bockius LLP.

### EXPERTS
The financial statements incorporated in this prospectus by reference to the Annual Report on Form 10-K for the year ended December 31, 2022 have been so incorporated in reliance on the report of PricewaterhouseCoopers LLP, an independent registered public accounting firm, given on the authority of said firm as experts in auditing and accounting.

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TABLE OF CONTENTS

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<div align='center'>**$350,000,000**</div>

#### 5.625% First Mortgage Bonds due 2055
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#### Prospectus Supplement

#### September 15, 2025​
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#### Joint Book-Running Managers

#### KeyBanc Capital Markets

#### TD Securities

#### US Bancorp

#### Fifth Third Securities

#### Co-Managers

#### Academy Securities

#### Cabrera Capital Markets LLC

#### Ramirez & Co., Inc.
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