X0306 4 2017-01-25 0 0001410636 American Water Works Company, Inc. AWK 0001629296 Degillio Deborah A 1025 LAUREL OAK ROAD VOORHEES NJ 08043 0 1 0 0 President, AWE Common Stock 2017-01-25 4 M 0 741 0.00 A 1861 D Common Stock 2017-01-25 4 A 0 576 0.00 A 2437 D Common Stock 2017-01-25 4 F 0 527 71.72 D 1910 D Performance Stock Units 2017-01-25 4 A 0 318 0.00 A 2016-12-31 Common Stock 318 741 D Performance Stock Units 2017-01-25 4 M 0 741 0.00 D 2016-12-31 Common Stock 741 0 D Each performance stock unit represented a contingent right to receive one share of common stock of American Water Works Company, Inc. (the "Company"), based on the Company's annual relative total stockholder return over a three-year performance period, beginning on January 1, 2014 and ending December 31, 2016. Represents the above-target earned portion of the TSR performance stock unit. In 2014, the Company granted 423 performance stock units, equal to the number of shares to be received if target performance was achieved. Represents the end of the performance period to which the performance stock units relate. Represents the earned portion of the TSR performance stock units, including target units granted in 2014 and above-target units earned based on TSR performance. The number of TSR performance stock units earned was 175 percent of the target. /s/ Jeffrey M. Taylor, as attorney-in-fact for Deborah A. Degillio 2017-01-27