X0306 4 2020-06-10 0 0001370450 Willdan Group, Inc. WLDN 0001733678 CHEN MICAH 2401 E. KATELLA AVE SUITE 300 ANAHEIM CA 92806 0 1 0 0 General Counsel Common Stock 2020-06-10 4 A 0 9816 0 A 19076 D Represents performance-based restricted stock units previously granted to the Reporting Person by the Issuer on June 13, 2019. The performance conditions applicable to the award were determined to have been satisfied by the Issuer's Compensation Committee on June 10, 2020, resulting in the immediate vesting of the restricted stock units as to 9,816 shares of Common Stock. /s/ Stacy McLaughlin, Attorney-in-fact for Micah Chen 2020-06-12