BIEBER MICHAEL A 4

What Happened

• Michael A. Bieber, President & CEO and Director of Willdan Group, exercised 9,991 stock options on May 13, 2026 at a strike price of $16.27 (cost = $162,554) and immediately sold the 9,991 underlying shares in the open market for a weighted average price of $92.65, generating gross proceeds of approximately $925,666. The Form 4 also records the disposition of the derivative instrument (the exercised options) associated with those shares.

Key Details

• Transaction date: May 13, 2026; Form 4 filed May 14, 2026 (filed the next day).
• Exercise: 9,991 shares acquired at $16.27 each; total exercise cost reported $162,554.
• Sale: 9,991 shares sold at a weighted average price of $92.65; total proceeds reported $925,666. Sales occurred at prices ranging from $92.50 to $92.85 (per footnote).
• Derivative disposition: 9,991 option units reported disposed at $0.00 (reflects the exercised option being converted/cancelled).
• Shares owned after transaction: not specified in this filing.
• Footnotes: Options were granted under the Willdan Amended and Restated 2008 Performance Incentive Plan and vested in past years (vested in installments through 2019). The filer offers to provide a breakdown of the exact number of shares sold at each price within the reported range upon request.

Context

• This was an exercise of vested stock options followed by an immediate open-market sale of the resulting shares (i.e., a cashless or simultaneous exercise-and-sell pattern). Such transactions are commonly used to realize gains from vested options; the filing is informational and does not itself indicate insider sentiment about the company’s prospects.