X0508 4 2026-03-05 0 0001035201 CALIFORNIA WATER SERVICE GROUP CWT 0001998622 James Sophie Marwieh 1720 NORTH FIRST STREET SAN JOSE CA 95112 0 1 0 0 VP Water Qual & Envir Affairs 0 Common Stock 2026-03-05 4 F 0 57 45.78 D 8037.706 D Common Stock 2026-03-07 4 A 0 548 0.0 A 8585.706 D Common Stock 2026-03-07 4 F 0 232 45.59 D 8353.706 D Common Stock 2026-03-07 4 F 0 27 45.59 D 8326.706 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) The reporting person was granted a Performance Stock Unit (PSU) award on 3/7/2023. The PSU vested in full based on the satisfaction of certain performance criteria approved by the Board of Directors. The performance criteria was met resulting in 46% payout of the original goal 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 a Performance Stock Unit (PSU) Award. By: /s/ Michelle R. Mortensen For: Sophie M James 2026-03-09