X0508 4 2025-06-06 0001035201 CALIFORNIA WATER SERVICE GROUP CWT 0001668263 Ouyang Elissa Y 1720 NORTH FIRST STREET SAN JOSE CA 95112 1 Chief Procurement & Lead CI 0 Common Stock 2025-06-06 4 F 0 64 45.85 D 13422.04 D Represents the number of shares withheld by and surrendered to the Issuer to satisfy the tax withholding obligations that arose in connection with the vesting of the Restricted Stock Award (RSA) Award #798. /s/ Michelle R. Mortensen on behalf of Elissa Y Ouyang 2025-06-09