X0508 4 2023-09-01 0001035201 CALIFORNIA WATER SERVICE GROUP CWT 0001555093 Healey David B C/O CALIFORNIA WATER SERVICE COMPANY SAN JOSE CA 95112 1 VP, CEO and Treasurer 0 Common Stock 2023-09-01 4 D 0 38 50.10 D 1242 D Common Stock 2023-09-03 4 D 0 39 50.10 D 1205 D Represents the number of shares withheld by and surrendered to the Issuer to satisfy the tax obligations that arose in connection with the vesting of Restricted Stock Award (RSA) 636 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 Restricted Stock Award (RSA) 594 Includes shares received through dividend reinvestment /s/ Michelle R. Mortensen on behalf of David B. Healey 2023-09-06