Form 4 Filing for Michael B Luu

This filing details two transactions by Michael B. Luu, SVP Corp Svce & Chief Risk Of at CALIFORNIA WATER SERVICE GROUP, on September 4, 2026, and September 5, 2026. On September 4, 70 shares of Common Stock were disposed of with a price per share of $50.03, resulting in 23811.547 shares remaining. This disposal was to satisfy tax withholding obligations from a Restricted Stock Award granted on March 4, 2025. On September 5, 68 shares of Common Stock were disposed of, also at $50.03 per share, leaving 23743.547 shares. This transaction was to cover tax withholding obligations from a Restricted Stock Award granted on June 5, 2024. Both transactions were direct holdings and marked as disposals.