<div><div></div><div><span><p><span>Michael A. Bieber, a Director and President And CEO, reported sales of common stock on May 14, 2026. The transactions were sales at weighted average prices of $90.88, $91.95, $92.65 and $93.74 per share for the respective lots. The total gross proceeds from the sales were $5,190,212. After the reported transactions, the Reporting Person directly owned 249,525 shares of common stock. The report notes restricted stock units included in that total and provides price ranges for the multiple trades comprising each weighted-average price.</span></p><div><table><tbody><tr><td><span>Reporter Name</span></td><td><span>Bieber Michael A</span></td></tr><tr><td><span>Relationship</span></td><td><span>PRESIDENT AND CEO</span></td></tr><tr><td><span>Type</span></td><td><span>Sell</span></td></tr><tr><td><span>Amount</span></td><td><span>$5,190,212</span></td></tr><tr><td><span>SEC Filing</span></td><td>Form 4</td></tr></tbody></table></div><section><b><span class="heading-JaE7wgR2">Disclaimer</span></b><div><span>This is an AI-powered summary. It may contain inaccuracies. Consider verifying important information with the source. Please note this summary is solely based on documents filed with the SEC.</span></div></section></span></div></div>

WLDN

<p>Michael A. Bieber, President and CEO of Willdan Group, sold shares worth $5.1 million on May 14, 2026, at average prices ranging from $90.88 to $93.74 per share. Post-sale, he retains 249,525 shares of common stock, including restricted stock units.</p>

Willdan Group President And CEO Sold Shares Worth Over $5.1M