Company: AILIM
Filing Date: 2025-09-16
Form Type: 424B2
Source: 0001104659-25-090464
Chunk: 83

Company: Ameren Illinois Co
Filing Date: 2025-09-16
Form: 424B2
Chunk 83
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 by the trustee as such.

Issuance of Additional Senior Unsecured Debt Securities

The senior unsecured indenture will provide that senior unsecured debt securities may be issued thereunder without limitation as to aggregate principal amount.

#### Provisions of a Particular Series
The prospectus supplement applicable to a series of senior unsecured debt securities will specify:

•

the title and any limitation on the aggregate principal amount of the senior unsecured debt securities;

•

the original issue date for the senior unsecured debt securities and the date on which the senior unsecured debt securities will mature;

•

the interest rate or rates, or method of calculation thereof, for the senior unsecured debt securities, and the date from which interest shall accrue;

•

the dates on which interest will be payable;

•

the record dates for payments of interest if other than the fifteenth day next preceding each interest payment date;

•

the terms, if any, regarding the optional or mandatory redemption of the senior unsecured debt securities, including redemption date or dates of the senior unsecured debt securities, if any, and the price or prices applicable to such redemption;

•

any period or periods within which, the price or prices at which and the terms and conditions upon which the senior unsecured debt securities may be repaid, in whole or in part, at the option of the holder thereof; and

•

any other terms of the senior unsecured debt securities not inconsistent with the senior unsecured indenture.

Unless otherwise indicated in the applicable prospectus supplement, the senior unsecured debt securities will be denominated in United States currency in minimum denominations of $1,000 and integral multiples thereof.

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There will be no requirement under the senior unsecured indenture that our future issuances of debt securities be issued exclusively under the senior unsecured indenture, and we will be free to employ other indentures or documentation containing provisions different from those included in the senior unsecured indenture or applicable to one or more issuances of senior unsecured debt securities, in connection with future issuances of other debt securities.

The senior unsecured indenture will provide that the senior unsecured debt securities will be issued in one or more series, may be issued at various times, may have differing maturity dates, may have differing redemption provisions and may bear interest at differing rates. We need not issue all senior unsecured debt securities of one series at the same time, and, unless otherwise indicated in the applicable prospectus supplement, we may from time