Willdan Group, Inc.

We maintain disclosure controls and procedures, as defined in Rule 13a-15(e) and Rule 15-d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), as controls and other procedures that are designed to ensure that information required to be disclosed by the issuer in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed in the reports that we file or submit under the Securities Exchange Act is accumulated and communicated to our management, including our President and Chief Executive Officer, Michael A. Bieber, and our Chief Financial Officer and Executive Vice President, Creighton K. Early, as appropriate to allow timely decisions regarding required disclosure.

In connection with the preparation of this Quarterly Report, an evaluation was performed under the supervision and with the participation of our management, including our principal executive officer and principal financial officer, of the effectiveness of our disclosure controls and procedures as of April 3, 2026. Based on that evaluation, our principal executive officer and principal financial officer concluded that our disclosure controls and procedures were effective, at a reasonable assurance level, as of April 3, 2026.

On January 2, 2026, we completed the acquisition of Compass Municipal Advisors, LLC. (“Compass”). Prior to the acquisition, Compass was a privately-held company and was not subject to the Sarbanes-Oxley Act of 2002, the rules and regulations of the SEC, or other corporate governance requirements applicable to public reporting companies. As part of our ongoing integration activities, we are continuing to incorporate our controls and procedures into Compass, and, if needed, to augment our company-wide controls to reflect the risks that may be inherent in the acquisition of this privately-held company.

Other than our integration of Compass, there have been no changes in our internal control over financial reporting during the quarter ended April 3, 2026, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.