X0508 4 2025-12-22 0001035201 CALIFORNIA WATER SERVICE GROUP CWT 0001629473 Mortensen Michelle R 1720 NORTH FIRST STREET SAN JOSE CA 95112 false true false false VP, Corp Sec &Chief of Staff 0 Common Stock 2025-12-23 4 S false 924 43.34 D 11511.80 D The sale of 924 shares was executed in a single transaction with the share price of $43.34. The reporting person hereby undertakes to provide upon request to the SEC staff the issuer or security holder of the full issuer information regarding the number shares and price at which the transaction was effected. Michelle R. Mortensen 2025-12-23