WILLDAN GROUP,INC. (NASDAQ:WLDN) Files An 8-K Changes in Registrant’s Certifying Accountant
Item 4.01. Changes in Registrant’s Certifying Accountant

(a)Dismissal of Independent Registered Public Accountant

Willdan Group,Inc. (“Willdan”) has dismissed KPMG LLP (“KPMG”), an independent registered public accounting firm, as its principal accountant. The decision to dismiss KPMG was effective on July11, 2018, after being approved by Willdan’s audit committee (the “Audit Committee”).

The reports of KPMG on Willdan’s consolidated financial statements for the fiscal years ended December29, 2017 and December30, 2016 did not contain an adverse opinion or disclaimer of opinion, and such reports were not qualified or modified as to uncertainty, audit scope, or accounting principle.

During Willdan’s fiscal years ended December30, 2016 and December29, 2017, and the interim period from December30, 2017 through and including July11, 2018, the date of KPMG’s dismissal, (i)there were no “disagreements” (as that term is defined in Item 304(a)(1)(iv)of Regulation S-K and the related instructions) between Willdan and KPMG on any matter of accounting principles or practices, financial statement disclosure, or auditing scope or procedure, which, if not resolved to the satisfaction of KPMG, would have caused KPMG to make reference to the subject matter of the disagreement in connection with its reports on Willdan’s consolidated financial statements for such years or any subsequent interim period through the date of dismissal, and (ii)there were no “reportable events” (as defined in Item 304(a)(1)(v)of Regulation S-K).

In accordance with Item 304(a)(3)of Regulation S-K, Willdan provided KPMG with a copy of this Current Report on Form8-K and requested that, as promptly as possible, KPMG provide Willdan with a letter addressed to the Securities and Exchange Commission (the “SEC”) stating whether it agrees with the above statements and, if not, stating the respects in which it does not agree. Attached as Exhibit16.1 is a copy of KPMG’s letter dated July17, 2018.

(b)Newly Appointed Independent Registered Public Accountant

On July11, 2018, the Audit Committee approved the engagement of Crowe LLP (“Crowe”), an independent registered public accounting firm, as its principal accountant to perform independent audit services beginning with the fiscal year ending December28, 2018. During Willdan’s fiscal years ended December30, 2016 and December29, 2017, and the interim period from December30, 2017 through and including July11, 2018, the date of Crowe’s engagement, neither Willdan, nor anyone acting on its behalf, consulted Crowe regarding either (i)the application of accounting principles to a specified transaction, either completed or proposed, or the type of audit opinion that might be rendered with respect to the consolidated financial statements of Willdan, in any case where a written report or oral advice was provided to Willdan by Crowe that Crowe concluded was an important factor considered by Willdan in reaching a decision as to any accounting, auditing or financial reporting issue; or (ii)any matter that was the subject of a disagreement (as that term is defined in Item 304(a)(1)(iv)of Regulation S-K and the related instructions to Item 304 of Regulation S-K) or a “reportable event” (as that term is described in Item 304(a)(1)(v)of Regulation S-K).

Item 9.01Financial Statements and Exhibits

(d)Exhibits.

i