X0306 4 2023-03-01 0001035201 CALIFORNIA WATER SERVICE GROUP CWT 0001639869 Kuta Robert J 1720 NORTH FIRST STREET SAN JOSE CA 95112 1 VP, Engineering Common Stock 2023-03-01 4 F 0 242 55.90 D 11625.47 D Common Stock 2023-03-02 4 F 0 62 56.76 D 11563.47 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 (RSA) Award #640. 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 #596. /s/ Michelle R. Mortensen on behalf of Robert J Kuta 2023-03-03