X0306 4 2016-01-01 0 0001410636 American Water Works Company, Inc. AWK 0001233549 STORY SUSAN N 1025 LAUREL OAK ROAD VOORHEES NJ 08043 1 0 0 0 Common Stock 2016-01-01 4 F 0 1757 59.75 D 37780 D Includes an aggregate of 1,580 shares purchased under the American Water Works Company, Inc. Employee Stock Purchase Plan (including 1,003 of such shares that were purchased since the reporting person's last Form 4 and 316 of such shares that were inadvertently omitted from certain of the reporting person's prior Form 4s). /s/ Jeffrey M. Taylor, as attorney-in-fact for Susan N. Story 2016-01-05