MICHAEL A. BIEBER - 09 Mar 2026 Form 4 Insider Report for Willdan Group, Inc. (WLDN)

Role: PRESIDENT AND CEO, Director
Signature: /s/ Creighton K. Early, Attorney-in-fact for Michael A. Bieber
Issuer symbol: WLDN
Transactions as of: 09 Mar 2026
Net transactions value: $0
Form type: 4
Filing time: 11 Mar 2026, 19:11:57 UTC
Previous filing: 05 Mar 2026
Next filing: 12 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
BIEBER MICHAEL A	PRESIDENT AND CEO, Director	2401 EAST KATELLA AVENUE, SUITE 300, ANAHEIM	/s/ Creighton K. Early, Attorney-in-fact for Michael A. Bieber	11 Mar 2026	0001270606

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	WLDN	Common Stock	Tax liability		-1,814	-0.8%	$82.98^*	223,882	09 Mar 2026	Direct	F1, F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Represents shares of the Issuer's Common Stock withheld to satisfy tax withholding obligations in connection with the vesting of restricted stock on March 7, 2026, which restricted stock was granted on March 7, 2023.
F2	Includes (i) 18,000 shares of restricted stock units that vest in three substantially equal installments on each of March 3, 2027, March 3, 2028 and March 3, 2029, (ii) 19,250 shares of restricted stock units that vest in three substantially equal installments on each of March 17, 2026, March 17, 2027 and March 17, 2028, and (iii) 11,667 shares of restricted stock units that vest in two substantially equal installments on each of March 20, 2026 and March 20, 2027, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

Content

Represents shares of the Issuer's Common Stock withheld to satisfy tax withholding obligations in connection with the vesting of restricted stock on March 7, 2026, which restricted stock was granted on March 7, 2023.

Includes (i) 18,000 shares of restricted stock units that vest in three substantially equal installments on each of March 3, 2027, March 3, 2028 and March 3, 2029, (ii) 19,250 shares of restricted stock units that vest in three substantially equal installments on each of March 17, 2026, March 17, 2027 and March 17, 2028, and (iii) 11,667 shares of restricted stock units that vest in two substantially equal installments on each of March 20, 2026 and March 20, 2027, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.