X0609 4 2026-05-13 0 0001410636 American Water Works Company, Inc. AWK 0001337315 KAMPLING PATRICIA L false 1 WATER STREET CAMDEN NJ 08102-1658 1 0 0 0 0 Common Stock 2026-05-13 4 A 0 1374 0 A 9028 D The shares indicated constitute units that settle solely in the common stock of American Water Works Company, Inc. (the "Company") on a one-share-per-unit basis. The stock units vested on the date of grant and will be converted immediately into shares of Company common stock. /s/ Jeffrey M. Taylor, as attorney-in-fact for Patricia L. Kampling 2026-05-13