X0306 4 2020-02-24 0000004904 AMERICAN ELECTRIC POWER CO INC AEP 0001423515 TIERNEY BRIAN X 1 RIVERSIDE PLAZA COLUMBUS OH 43215 0 1 0 0 Executive VP, CFO Common Stock 2020-02-24 4 S 0 18573 101.55 D 45162 D This transaction was executed in multiple trades at prices ranging from $101.51 to $101.63. The price reported above reflects the weighted average sale. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder full information regarding the number of shares and prices at which the transaction was effected. /s/ Thomas G. Berkemeyer, Attorney-in-Fact for Brian X. Tierney 2020-02-26