X0306 4 2020-06-10 0 0001370450 Willdan Group, Inc. WLDN 0001452377 Chow Daniel 2401 EAST KATELLA AVE SUITE 300 ANAHEIM CA 92806 0 1 0 0 Chief Operating Officer Common Stock 2020-06-10 4 A 0 12618 0 A 60362 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 12,618 shares of Common Stock. Includes 889 shares of restricted stock that vest on October 31, 2020. /s/ Stacy McLaughlin, Attorney-in-fact for Daniel Chow 2020-06-12