BBSI · Barrett Business Services Inc

The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 15, 2025.

The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 15, 2025.

This transaction was executed in multiple trades at prices ranging from $36.96 to $37.83. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 15, 2025.

This transaction was executed in multiple trades at prices ranging from $37.69 to $37.9183. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

Each Restricted Stock Unit represents a contingent right to receive one share of the Issuer's common stock.

The Restricted Stock Units vest in one installment on July 1, 2027, and will be settled by delivery of unrestricted shares of common stock on the vesting date.

Each Restricted Stock Unit represents a contingent right to receive one share of the Issuer's common stock.

The Restricted Stock Units vest in four annual installments beginning July 1, 2025, and will be settled by delivery of unrestricted shares of common stock on the vesting date.

Each Restricted Stock Unit represents a contingent right to receive one share of the Issuer's common stock.

The Restricted Stock Units vest in four annual installments beginning July 1, 2024, and will be settled by delivery of unrestricted shares of common stock on the vesting date.

Each Restricted Stock Unit represents a contingent right to receive one share of the Issuer's common stock.

The Restricted Stock Units vest in one installment on July 1, 2031, and will be settled by delivery of unrestricted shares of common stock on the vesting date

Each Restricted Stock Unit represents a contingent right to receive one share of the Issuer's common stock.

The Restricted Stock Units vest in one installment on July 1, 2027, and will be settled by delivery of unrestricted shares of common stock on the vesting date.

Each Restricted Stock Unit represents a contingent right to receive one share of the Issuer's common stock.

The Restricted Stock Units vest in four annual installments beginning July 1, 2026, and will be settled by delivery of unrestricted shares of common stock on the vesting date.

Each Restricted Stock Unit represents a contingent right to receive one share of the Issuer's common stock.

The Restricted Stock Units vest in one installment on July 1, 2026, and will be settled by delivery of unrestricted shares of common stock on the vesting date.

Each Restricted Stock Unit represents a contingent right to receive one share of the Issuer's common stock.

The Restricted Stock Units vest in one installment on July 1, 2026, and will be settled by delivery of unrestricted shares of common stock on the vesting date.

Each Restricted Stock Unit represents a contingent right to receive one share of the Issuer's common stock.

The Restricted Stock Units vest in four annual installments beginning July 1, 2023, and will be settled by delivery of unrestricted shares of common stock on the vesting date.

Each Restricted Stock Unit represents a contingent right to receive one share of the Issuer's common stock.

The Restricted Stock Units vest in one installment on July 1, 2027, and will be settled by delivery of unrestricted shares of common stock on the vesting date.

Each Restricted Stock Unit represents a contingent right to receive one share of the Issuer's common stock.

The Restricted Stock Units vest in one installment on July 1, 2026, and will be settled by delivery of unrestricted shares of common stock on the vesting date.

Each Restricted Stock Unit represents a contingent right to receive one share of the Issuer's common stock.

The Restricted Stock Units vest in four annual installments beginning July 1, 2024, and will be settled by delivery of unrestricted shares of common stock on the vesting date.

Each Restricted Stock Unit represents a contingent right to receive one share of the Issuer's common stock.

The Restricted Stock Units vest in one installment on July 1, 2026, and will be settled by delivery of unrestricted shares of common stock on the vesting date.

Each Restricted Stock Unit represents a contingent right to receive one share of the Issuer's common stock.

The Restricted Stock Units vest in four annual installments beginning July 1, 2027, and will be settled by delivery of unrestricted shares of common stock on the vesting date.

Each Restricted Stock Unit represents a contingent right to receive one share of the Issuer's common stock.

The Restricted Stock Units vest in four annual installments beginning July 1, 2025, and will be settled by delivery of unrestricted shares of common stock on the vesting date.

Each Restricted Stock Unit represents a contingent right to receive one share of the Issuer's common stock.

The Restricted Stock Units vest in one installment on July 1, 2026, and will be settled by delivery of unrestricted shares of common stock on the vesting date.

Each Restricted Stock Unit represents a contingent right to receive one share of the Issuer's common stock.

The Restricted Stock Units vest in one installment on July 1, 2026, and will be settled by delivery of unrestricted shares of common stock on the vesting date.

Each Restricted Stock Unit represents a contingent right to receive one share of the Issuer's common stock.

The Restricted Stock Units vest in one installment on July 1, 2027, and will be settled by delivery of unrestricted shares of common stock on the vesting date.

Each Restricted Stock Unit represents a contingent right to receive one share of the Issuer's common stock.

The Restricted Stock Units vest in four annual installments beginning July 1, 2023, and will be settled by delivery of unrestricted shares of common stock on the vesting date.

Each Restricted Stock Unit represents a contingent right to receive one share of the Issuer's common stock.

The Restricted Stock Units vest in four annual installments beginning July 1, 2024, and will be settled by delivery of unrestricted shares of common stock on the vesting date.

Each Restricted Stock Unit represents a contingent right to receive one share of the Issuer's common stock.

The Restricted Stock Units vest in one installment on July 1, 2026, and will be settled by delivery of unrestricted shares of common stock on the vesting date.