Form 4 Filing for Michelle R. Mortensen

This filing details Form 4 transactions for Michelle R. Mortensen, VP Corp Sect, Gov & Assurance at CALIFORNIA WATER SERVICE GROUP. On September 4, 2026, 75 shares of Common Stock were disposed of at a price of $50.03 per share, totaling 75 shares. This action was taken to satisfy tax withholding obligations related to a Restricted Stock Award granted on March 4, 2025. Following this transaction, the post-transaction shares owned are 12879.564. On September 5, 2026, an additional 73 shares of Common Stock were disposed of under similar circumstances, also at $50.03 per share, to cover tax withholding for a Restricted Stock Award granted on June 5, 2024. This resulted in 12806.564 shares owned post-transaction. Both transactions were marked with code "F" and "D" for acquired/disposed, indicating a disposition of shares.