X0508 4 2025-12-05 0 0001035201 CALIFORNIA WATER SERVICE GROUP CWT 0001222882 KROPELNICKI MARTIN A 1720 NORTH FIRST STREET SAN JOSE CA 95112 0 1 0 0 Chairman President & CEO 0 Common Stock 2025-12-05 4 F 0 492 44.88 D 139638.75 D Common Stock 2025-12-05 4 G 0 3000 0.0 D 136638.75 D Common Stock 2025-12-07 4 F 0 385 44.88 D 136253.75 D Represents the number of shares withheld and surrendered to the issuer to satisfy the tax withholding obligations that arose in connection with the vesting of Restricted Stock (RSA) Award granted on June 5, 2024. The transaction represents gift to donor-advised fund. This is not a market transaction, thus no price has been reported. Represents the number of shares withheld and surrendered to the issuer to satisfy the tax withholding obligations that arose in connection with the vesting of Restricted Stock (RSA) Award granted on March 7, 2023. By: /s/ Michelle R. Mortensen For: Martin A. Kropelnicki 2025-12-09