[Form 4] Willdan Group, Inc. Insider Trading Activity

Willdan Group, Inc. president and CEO Michael A. Bieber reported equity compensation changes.

Rhea-AI Filing Summary

Willdan Group, Inc. president and CEO Michael A. Bieber reported equity compensation changes. Performance-based restricted stock units granted on March 7, 2023 vested into 18,810 shares of Common Stock after the compensation committee determined the performance conditions were satisfied on March 11, 2026.

To cover related tax obligations, 7,697 shares of Common Stock were withheld, a non-market disposition that does not represent an open-market sale. After these transactions, Bieber directly holds 234,995 shares of Common Stock.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider BIEBER MICHAEL A

Role PRESIDENT AND CEO

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	18,810	$0.00	$0.00
Exercise Price or Tax Liability	Common Stock	7,697	$83.98	$646K

Holdings After Transaction: Common Stock — 234,995 shares (Direct)

Footnotes (3)

1. F1. Represents performance-based restricted stock units previously granted to the Reporting Person by the Issuer on March 7, 2023. The performance conditions applicable to the award were determined to have been satisfied by the Issuer's Compensation Committee effective on March 11, 2026, resulting in the immediate vesting of the restricted stock units as to 18,810 shares of Common Stock.
2. 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.
3. F3. Represents shares of the Issuer's Common Stock withheld to satisfy tax withholding obligations in connection with the vesting of the performance-based restricted stock units referenced in footnote (1).

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did Willdan Group (WLDN) report for its CEO?

Willdan Group reported equity awards vesting for its CEO. Michael A. Bieber had 18,810 performance-based restricted stock units vest into common shares after performance goals were met, with part of the shares withheld to satisfy tax obligations.

How many Willdan Group (WLDN) shares vested for CEO Michael Bieber?

18,810 shares of Common Stock vested for the CEO. These shares came from performance-based restricted stock units granted on March 7, 2023, which vested on March 11, 2026 after the compensation committee confirmed the performance conditions were satisfied.

Were any Willdan Group (WLDN) shares sold by the CEO in this filing?

No open-market sales were reported in this filing. Instead, 7,697 shares of Common Stock were withheld by the company to satisfy tax withholding obligations associated with the vesting of performance-based restricted stock units.

How many Willdan Group (WLDN) shares does the CEO hold after these transactions?

After the reported transactions, the CEO holds 234,995 shares. This figure reflects direct ownership of Common Stock following the vesting of 18,810 shares and the withholding of 7,697 shares for tax obligations.

What future restricted stock units remain outstanding for the Willdan Group (WLDN) CEO?

The CEO retains several unvested restricted stock unit grants. These include 18,000 units vesting in three installments from March 3, 2027 to March 3, 2029 and additional units vesting on March 17 and March 20 across 2026–2028, subject to continued service.

What does the F code mean in the Willdan Group (WLDN) Form 4 filing?

The F transaction code indicates tax withholding in shares. For this filing, 7,697 shares of Common Stock were withheld to cover tax liabilities triggered by the vesting of performance-based restricted stock units, rather than being sold on the open market.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 03/12/2026 - 05:33 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

BIEBER MICHAEL A

(Last) (First) (Middle)

2401 EAST KATELLA AVENUE

SUITE 300

(Street)

ANAHEIM CA 92806

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Willdan Group, Inc. [ WLDN ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	PRESIDENT AND CEO

3. Date of Earliest Transaction (Month/Day/Year)
03/11/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/11/2026		A		18,810(1)	A	$0	242,692(2)	D
Common Stock	03/11/2026		F		7,697(3)	D	$83.98	234,995(2)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents performance-based restricted stock units previously granted to the Reporting Person by the Issuer on March 7, 2023. The performance conditions applicable to the award were determined to have been satisfied by the Issuer's Compensation Committee effective on March 11, 2026, resulting in the immediate vesting of the restricted stock units as to 18,810 shares of Common Stock.

2. 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.

3. Represents shares of the Issuer's Common Stock withheld to satisfy tax withholding obligations in connection with the vesting of the performance-based restricted stock units referenced in footnote (1).

	/s/ Creighton K. Early, Attorney-in-fact for Michael A. Bieber	03/12/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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