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The following table presents the principal credit ratings of the Ameren companies by S&P and Moody’s, reaffirmed as of Apr. 2026 and May 2026, respectively.

Issuer Moody's
Standard and Poor's

Rating
Rating
Ameren Corporation (Stable Outlook)
Issuer/Corp. Credit Rating Baa1
BBB+
Senior Unsecured Baa1
BBB
Commercial Paper P-2
A-2
Ameren Missouri (Stable Outlook):
FMB/Senior Secured A2
A
Issuer/Corp. Credit Rating Baa1
BBB+
Senior Unsecured Baa1
Not Rated
Preferred Stock Baa3
BBB-
Commercial Paper P-2
A-2
Ameren Illinois Company (Positive Outlook):


FMB/Senior Secured A1
A
Issuer/Corp. Credit Rating A3
BBB+
Senior Unsecured A3
BBB+
Preferred Stock Baa2
BBB-
Commercial Paper P-2
A-2
Ameren Transmission Company of Illinois (Stable Outlook):
Senior Unsecured A2
Not Rated
Issuer
Ameren Corporation (Stable Outlook)
Issuer/Corp. Credit Rating
Moody's
Rating
Baa1
Standard & Poor's
Rating
BBB+
Senior Unsecured
Moody's
Rating
Baa1
Standard & Poor's
Rating
BBB
Commercial Paper
Moody's
Rating
P-2
Standard & Poor's
Rating
A-2
Ameren Missouri (Stable Outlook):
FMB/Senior Secured
Moody's
Rating
A2
Standard & Poor's
Rating
A
Issuer/Corp. Credit Rating
Moody's
Rating
Baa1
Standard & Poor's
Rating
BBB+
Senior Unsecured
Moody's
Rating
Baa1
Standard & Poor's
Rating
BBB+
Preferred Stock
Moody's
Rating
Baa3
Standard & Poor's
Rating
BBB-
Commercial Paper
Moody's
Rating
P-2
Standard & Poor's
Rating
A-2
Insured Tax Exempts - 92&89 A,B,C
Moody's
Rating
A2
Standard & Poor's
Rating
A
Ameren Illinois Company (Positive Outlook):
FMB/Senior Secured
Moody's
Rating
A1
Standard & Poor's
Rating
A
Issuer/Corp. Credit Rating
Moody's
Rating
A3
Standard & Poor's
Rating
BBB+
Senior Unsecured
Moody's
Rating
A3
Standard & Poor's
Rating
BBB+
Preferred Stock
Moody's
Rating
Baa2
Standard & Poor's
Rating
BBB-
Commercial Paper
Moody's
Rating
P-2
Standard & Poor's
Rating
A-2
Ameren Transmission Company of Illinois (Stable Outlook)
Senior Unsecured
Moody's
Rating
A2
Standard & Poor's
Rating
Not Rated

A credit rating is not a recommendation to buy, sell, or hold securities. It should be evaluated independently of any other rating. Ratings are subject to revision or withdrawal at any time by the rating organization.

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