September 30, 2021, and September 30, 2021, compared with Ameren Missouri customer level

The following are the components of Ameren's income statement by sector for the three and nine months ending September 30, 2021 and 2020:

The following is Ameren Illinois's income statement component table by sector for the three and nine months ending September 30, 2021 and 2020:

Net profit attributable to ordinary shareholders $34 $

Net profit attributable to ordinary shareholders $123 $

Net profit attributable to ordinary shareholders $107 $

[[Picture deletion: aee-20210930_g7.jpg]][[Picture deletion: aee-20210930_g8.jpg]][[Picture deletion: aee-20210930_g9.jpg]]

(a) Including Ameren Missouri natural gas profits of US$12 million and US$12 million for the three months ended September 30, 2021 and September 30, 2020, respectively.

Electricity and gas margin

Changes to natural gas purchased for resale:

Ameren Missouri Ameren Illinois Natural Gas Other/interdepartmental elimination

Due to the changes discussed below, in the three and nine months ending September 30, 2021, other operating and maintenance expenses increased by US$39 million and US$49 million compared to the same period last year.

Ameren Missouri Ameren Illinois Natural Gas Other/interdepartmental elimination

Ameren Missouri Ameren Illinois Natural Gas Other/interdepartmental elimination

[[Image deletion: aee-20210930_g19.jpg]][[Image deletion: aee-20210930_g20.jpg]][[Image deletion: aee-20210930_g21.jpg]] (a) Including US$5 million and US$4 million from Ameren Transmission Three months ending September 30, 2021 and 2020 respectively.

Ameren Missouri Ameren Illinois Natural Gas Other/interdepartmental elimination

[[Picture deletion: aee-20210930_g22.jpg]][[Picture deletion: aee-20210930_g23.jpg]][[Picture deletion: aee-20210930_g24.jpg]]

Ameren Missouri Ameren Illinois Natural Gas Other/interdepartmental elimination

The following table lists the main credit ratings of Moody's and Standard & Poor's (if applicable), effective from the date of this report:

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