Company: AILIM
Filing Date: 2025-09-16
Form Type: 424B2
Source: 0001104659-25-090464
Chunk: 26

Company: Ameren Illinois Co
Filing Date: 2025-09-16
Form: 424B2
Chunk 26
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writers has severally and not jointly agreed to purchase from us, the principal amount of bonds set forth opposite its name below.

| Underwriter                       | ​ | ​ | PrincipalAmount |   |             |   | ​ |
|:----------------------------------|:--|:--|:----------------|:--|------------:|:--|:--|
| KeyBanc Capital Markets Inc.      | ​ | ​ | ​               | $ |  98,000,000 | ​ | ​ |
| TD Securities (USA) LLC           | ​ | ​ | ​               | ​ |  98,000,000 | ​ | ​ |
| U.S. Bancorp Investments, Inc.    | ​ | ​ | ​               | ​ |  98,000,000 | ​ | ​ |
| Fifth Third Securities, Inc.      | ​ | ​ | ​               | ​ |  35,000,000 | ​ | ​ |
| Academy Securities, Inc.          | ​ | ​ | ​               | ​ |   7,000,000 | ​ | ​ |
| Cabrera Capital Markets LLC       | ​ | ​ | ​               | ​ |   7,000,000 | ​ | ​ |
| Samuel A. Ramirez & Company, Inc. | ​ | ​ | ​               | ​ |   7,000,000 | ​ | ​ |
| Total                             | ​ | ​ | ​               | $ | 350,000,000 | ​ | ​ |

The obligations of the underwriters, including their agreement to purchase bonds from us, are several and not joint. The underwriting agreement provides that the obligations of the underwriters are subject to certain conditions and that the underwriters will be obligated to purchase all of the bonds if any are purchased. The underwriting agreement also provides that if an underwriter defaults, the purchase commitments of the non-defaulting underwriters may be increased or the offering of bonds may be terminated. The underwriters have advised us that they propose to initially offer the bonds to the public at the offering price set forth on the cover page of this prospectus supplement and may also offer the bonds to dealers at a price that represents a concession not in excess of 0.525% of the principal amount of the bonds. Any underwriter may allow, and any of these dealers may re-allow, a concession not in excess of 0.350% of the principal amount of the bonds. After the initial offering of the bonds, the underwriters