X0609 4 2026-06-04 0 0001035201 CALIFORNIA WATER SERVICE GROUP CWT 0002058905 HAMNER KRISTAN A false 1720 NORTH FIRST STREET SAN JOSE CA 95112 0 1 0 0 VP, Chief Human Resource Offcr 0 Common Stock 2026-06-04 4 F 0 41 45.24 D 3003.819 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 March 4,2025 Includes shares acquired through the Employee Stock Purchase Program (ESPP). By: /s/ Michelle R. Mortensen For: Kristan Hamner 2026-06-08