    <SEC-DOCUMENT>0001104659-26-048632-index.html : 20260424
    <SEC-HEADER>0001104659-26-048632.hdr.sgml : 20260424
    <ACCEPTANCE-DATETIME>20260424163059
    ACCESSION NUMBER:		0001104659-26-048632
    CONFORMED SUBMISSION TYPE:	ARS
    PUBLIC DOCUMENT COUNT:		1
    CONFORMED PERIOD OF REPORT:	20251231
    FILED AS OF DATE:		20260424
    DATE AS OF CHANGE:		20260424
    EFFECTIVENESS DATE:		20260424

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			Willdan Group, Inc.
    		CENTRAL INDEX KEY:			0001370450
    		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-ENGINEERING SERVICES [8711]
    		ORGANIZATION NAME:           	07 Trade & Services
    		EIN:				141951112
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			0101

    	FILING VALUES:
    		FORM TYPE:		ARS
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-33076
    		FILM NUMBER:		26894789

    	BUSINESS ADDRESS:
    		STREET 1:		2401 EAST KATELLA AVENUE, SUITE 300
    		CITY:			ANAHEIM
    		STATE:			CA
    		ZIP:			92806
    		BUSINESS PHONE:		800-424-9144

    	MAIL ADDRESS:
    		STREET 1:		2401 EAST KATELLA AVENUE, SUITE 300
    		CITY:			ANAHEIM
    		STATE:			CA
    		ZIP:			92806
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>ARS
    <SEQUENCE>1
    <FILENAME>wldn-20251231xars.pdf
    <DESCRIPTION>ARS
    <TEXT>
    Document 1 - file: wldn-20251231xars.pdf

    </DOCUMENT>
    </SEC-DOCUMENT>