Form 4 Filing for Michelle R. Mortensen

This filing details two transactions by Michelle R. Mortensen, VP Corp Sect, Gov & Assurance at CALIFORNIA WATER SERVICE GROUP. On June 4, 2026, 74 shares of Common Stock were disposed of at a price of $45.24 per share, resulting in 13026.8 shares remaining. This disposal was to satisfy tax withholding obligations related to a Restricted Stock Award granted on March 4, 2025. On June 5, 2026, an additional 73 shares of Common Stock were disposed of at $45.82 per share, leaving 12953.8 shares. This transaction also served to cover tax withholding obligations from a Restricted Stock Award, this time granted on June 5, 2024. Both transactions were marked as direct ownership and involved the surrender of shares to the issuer.