X0306 4 2016-02-11 0001002910 AMEREN CORP AEE 0001190100 MARK RICHARD J P.O. BOX 66149 ST. LOUIS MO 63166-6149 0 0 0 1 Chmn & President of Subsidiary Common Stock, $.01 Par Value 8928 I By 401(K) Common Stock, $.01 Par Value 2016-02-11 4 A 0 46416 0 A 72379 D Amount includes a total of 1,002 shares acquired monthly from January through December 2015 at prices ranging from $37.81 to $46.02 per share. Shares acquired upon vesting of previously granted performance share units. Amount includes a total of 1,167 shares acquired through monthly payroll deductions and reinvested dividends during the first through fourth quarters of 2015 at prices ranging from $37.81 to $46.02 per share. G. L. Waters, Asst. Secy. of Ameren Corporation, attorney-in-fact for Richard J. Mark 2016-02-16