Transforming For Our Future

Financing Debt Financing . On Apr. 1, 2022, Ameren Missouri issued $525 million of 3.90% green first mortgage bonds due 2052 Proceeds to fund capital expenditures and refinance short-term debt; intend to allocate an amount equal to proceeds to sustainable projects meeting certain eligibility criteria Equity Financing On May 12, 2021, established a $750 million at-the-market (ATM) equity program to support expected equity needs through 2023 - Expected equity issuances in 2022 totaling $300 million¹ As of Apr. 1, entered into forward sale agreements expected to fulfill 2022 equity needs; expect to issue 3.4 million common shares by year-end 2022 upon settlement Pension and Postretirement Benefit Obligations • As of Dec 31, 2021, Ameren's pension and postretirement benefit obligations were 105% and 138% funded, respectively Ameren Credit Ratings and External Debt Balances² As of Mar. 31, 2022 Ameren $ in millions Moody's S&P Ameren Corporation (Issuer: Baa1/BBB+) Commercial paper $466 P-2 A-2 • Senior unsecured long-term debt Ameren Missouri (Issuer: Baa1/BBB+) Commercial paper $2,550 Baa1 BBB $528 P-2 A-2 • Senior secured long-term debt³ Ameren Illinois (Issuer: A3/BBB+) $5,421 A2 A Commercial paper $107 P-2 A-2 • Senior secured long-term debt ATXI (Issuer: A2/--) $4,438 A1 A Senior unsecured long-term debt $525 A2 2 Debt balances exclude unamortized debt expense, unamortized discount / premium, and financing obligations related to certain energy centers. A credit rating is not a recommendation to buy, sell, or hold any security and may be suspended, revised, or withdrawn at any time. 3 Does not include Ameren Missouri's green first mortgage bonds of $525 million issued on April 1, 2022. Issued and effective as of Feb. 18, 2022 Earnings Conference Call. First Quarter 2022 Earnings | May 6, 2022 17

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