AMEREN CORPORATION 19,000,000 SHARES COMMON STOCK Underwriting AgreementUnderwriting Agreement • September 15th, 2009 • Ameren Corp • Electric & other services combined
Ameren Corporation, a Missouri corporation (the Company), hereby confirms its agreement with you, as the underwriters named in Schedule I attached hereto (the Underwriters), for whom Barclays Capital Inc., J.P. Morgan Securities Inc., Merrill Lynch, Pierce, Fenner & Smith Incorporated, Morgan Stanley & Co. Incorporated and UBS Securities LLC are acting as representatives (in such capacity, the Representatives), with respect to the
