BBSI EVP James Potts RSU Vesting and Stock Transactions on July 1, 2026

This Form 4 filing reports equity compensation transactions for James R. Potts, EVP General Counsel & Secretary of Barrett Business Services Inc. (BBSI). On July 1, 2026, Potts received settlement of multiple Restricted Stock Unit (RSU) awards totaling 12,508 shares through the vesting of various tranches. These RSUs had different vesting schedules, including one-time vesting on July 1, 2026, and multi-year installment vesting programs beginning in 2023-2027. Concurrently, Potts sold 4,531 shares of common stock at $37.73 per share through open market transactions, resulting in net share acquisition of 7,977 shares. Following these transactions, Potts' direct ownership increased to 40,814 shares of BBSI common stock. The filing also shows Potts received new RSU awards of 9,496 shares with vesting dates extending to 2031.