X0306 4 2020-06-10 0 0001370450 Willdan Group, Inc. WLDN 0001601038 McLaughlin Stacy B. 2401 EAST KATELLA AVENUE SUITE 300 ANAHEIM CA 92806 0 1 0 0 Chief Financial Officer Common Stock 2020-06-10 4 A 0 9816 0 A 19772 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 B. McLaughlin 2020-06-12