Willdan CEO sells 56,676 shares after option exercise

Willdan Group, Inc. president and CEO Michael A. Bieber reported a combination of option exercises and open-market sales of common stock.

Rhea-AI Filing Summary

Willdan Group, Inc. president and CEO Michael A. Bieber reported a combination of option exercises and open-market sales of common stock. He exercised stock options covering 56,676 shares at strike prices of $16.27 and $28.19 per share, then sold 56,676 shares in multiple transactions at weighted-average prices between $90.50 and $93.99. The filing also notes restricted stock units that are scheduled to vest between March 2027 and March 2029, subject to his continued service.

Insights

Equity compensation and insider-trading analyst

CEO executes routine option exercises paired with same-day share sales.

Willdan Group’s president and CEO Michael A. Bieber exercised stock options for 56,676 shares of common stock at strike prices of $16.27 and $28.19 per share. These options were granted under the Amended and Restated 2008 Performance Incentive Plan and had fully vested prior to exercise.

On the same date, he sold 56,676 shares in open-market transactions at weighted-average prices ranging from $90.50 to $93.99, indicating an exercise-and-sell pattern that is common for monetizing vested options. The filing also lists unvested restricted stock units scheduled to vest between 2027 and 2029, which continue to tie a portion of his compensation to future company performance.

Insider Trade Summary

Exercise and Sale: 56,676 shares ($4.07M approx. pre-tax spread)

Exercise and Sale 8 txns

Insider BIEBER MICHAEL A

Role PRESIDENT AND CEO

Sold 56,676 shs ($5.19M)

Approx. gross sale proceeds $5.19M

Approx. exercise cost $1.12M

Approx. pre-tax spread $4.07M

Type	Security	Shares	Price	Value
Exercise	Stock Options (Right to Buy)	40,009	$0.00	$0.00
Exercise	Stock Options (Right to Buy)	16,667	$0.00	$0.00
Exercise	Common Stock	40,009	$16.27	$651K
Exercise	Common Stock	16,667	$28.19	$470K
Sale	Common Stock	25,429	$90.88	$2.31M
Sale	Common Stock	23,015	$91.95	$2.12M
Sale	Common Stock	7,956	$92.65	$737K
Sale	Common Stock	276	$93.74	$26K

Holdings After Transaction: Stock Options (Right to Buy) — 0 contracts (Direct); Common Stock — 249,525 shares (Direct)

Footnotes (7)

1. F1. 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) 12,834 shares of restricted stock units that vest in two substantially equal installments on each of March 17, 2027 and March 17, 2028, and (iii) 5,834 shares of restricted stock units that vest on March 20, 2027, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.
2. F2. The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $90.50 to $91.46, inclusive. The Reporting Person undertakes to provide to Willdan Group, Inc., any security holder of Willdan Group, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (2), footnote (3), footnote (4), and footnote (5).
3. F3. The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $91.50 to $92.49, inclusive.
4. F4. The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $92.50 to $93.41, inclusive.
5. F5. The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $93.62 to $93.99, inclusive.
6. F6. Stock options granted under the Willdan Group, Inc. Amended and Restated 2008 Performance Incentive Plan, which vested in three equal installments on each of November 3, 2017, November 3, 2018, and November 3, 2019.
7. F7. Stock options granted under the Willdan Group, Inc. Amended and Restated 2008 Performance Incentive Plan, which vested in three equal installments on each of March 8, 2018, March 8, 2019, and March 8, 2020.

Key Figures

Shares sold: 56,676 shares Shares from options exercised: 56,676 shares Sale price range: $90.50–$93.99 per share +5 more

8 metrics

Shares sold 56,676 shares Open-market sales on May 14, 2026

Shares from options exercised 56,676 shares Options exercised by CEO on May 14, 2026

Sale price range $90.50–$93.99 per share Weighted-average price bands across multiple trades

Option strike price 1 $16.27 per share Stock options exercised for 40,009 shares

Option strike price 2 $28.19 per share Stock options exercised for 16,667 shares

Unvested RSUs tranche 1 18,000 shares RSUs vesting in three installments in 2027–2029

Unvested RSUs tranche 2 12,834 shares RSUs vesting in two installments in 2027–2028

Unvested RSUs tranche 3 5,834 shares RSUs vesting on March 20, 2027

Key Terms

restricted stock units, weighted average price, Stock options (Right to Buy), Amended and Restated 2008 Performance Incentive Plan, +1 more

5 terms

restricted stock units financial

"Includes (i) 18,000 shares of restricted stock units that vest in three substantially equal installments..."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

weighted average price financial

"The price reported in Column 4 is the weighted average price."

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

Stock options (Right to Buy) financial

"security_title": "Stock Options (Right to Buy)""

Amended and Restated 2008 Performance Incentive Plan financial

"Stock options granted under the Willdan Group, Inc. Amended and Restated 2008 Performance Incentive Plan..."

derivative exercise/conversion financial

"transaction_action": "derivative exercise/conversion""

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 that CEO Michael A. Bieber exercised stock options for 56,676 shares and sold 56,676 common shares in open-market transactions. These trades occurred on May 14, 2026, and were disclosed in a Form 4 insider filing with detailed pricing ranges.

How many Willdan Group (WLDN) shares did the CEO sell and at what prices?

Michael A. Bieber sold 56,676 Willdan Group common shares in multiple open-market trades. The weighted-average sale prices ranged from $90.50 to $93.99 per share, with specific price bands disclosed across several footnotes detailing the transaction ranges on that date.

What stock options did the Willdan (WLDN) CEO exercise in this Form 4?

The CEO exercised stock options covering 56,676 Willdan common shares. These included 40,009 options with a $16.27 strike price and 16,667 options with a $28.19 strike price, all granted under the Amended and Restated 2008 Performance Incentive Plan and previously fully vested.

Does the Willdan Group (WLDN) CEO still have equity incentives after these transactions?

Yes. The filing notes restricted stock units totaling 36,668 shares that remain unvested. These RSUs are scheduled to vest in installments between March 2027 and March 2029, contingent on Michael A. Bieber’s continued service with Willdan Group through the applicable vesting dates.

Were the Willdan (WLDN) CEO’s share sales single trades or multiple transactions?

The CEO’s reported share sales were executed as multiple transactions, not a single block trade. Form 4 footnotes explain that the reported prices are weighted averages, with underlying trades occurring within specified price ranges between $90.50 and $93.99 per share.

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

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Accepted by SEC EDGAR 05/15/2026 - 06:08 PM EDT 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 CALIFORNIA 92806

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/14/2026

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

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

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

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	05/14/2026		M		40,009	A	$16.27	289,534(1)	D
Common Stock	05/14/2026		M		16,667	A	$28.19	306,201(1)	D
Common Stock	05/14/2026		S		25,429	D	$90.88(2)	280,772(1)	D
Common Stock	05/14/2026		S		23,015	D	$91.95(3)	257,757(1)	D
Common Stock	05/14/2026		S		7,956	D	$92.65(4)	249,801(1)	D
Common Stock	05/14/2026		S		276	D	$93.74(5)	249,525(1)	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
Stock Options (Right to Buy)	$16.27	05/14/2026		M			40,009	11/03/2017(6)	11/03/2026	Common Stock	40,009	$0	0	D
Stock Options (Right to Buy)	$28.19	05/14/2026		M			16,667	03/08/2018(7)	03/08/2027	Common Stock	16,667	$0	0	D

Explanation of Responses:

1. 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) 12,834 shares of restricted stock units that vest in two substantially equal installments on each of March 17, 2027 and March 17, 2028, and (iii) 5,834 shares of restricted stock units that vest on March 20, 2027, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

2. The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $90.50 to $91.46, inclusive. The Reporting Person undertakes to provide to Willdan Group, Inc., any security holder of Willdan Group, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (2), footnote (3), footnote (4), and footnote (5).

3. The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $91.50 to $92.49, inclusive.

4. The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $92.50 to $93.41, inclusive.

5. The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $93.62 to $93.99, inclusive.

6. Stock options granted under the Willdan Group, Inc. Amended and Restated 2008 Performance Incentive Plan, which vested in three equal installments on each of November 3, 2017, November 3, 2018, and November 3, 2019.

7. Stock options granted under the Willdan Group, Inc. Amended and Restated 2008 Performance Incentive Plan, which vested in three equal installments on each of March 8, 2018, March 8, 2019, and March 8, 2020.

	/s/ Creighton K. Early, Attorney-in-fact for Michael A. Bieber	05/15/2026
	** 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.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)