UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of
the Securities Exchange Act of 1934 (Amendment No.     )

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Preliminary Proxy Statement

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Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

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Definitive Proxy Statement

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Definitive Additional Materials

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Soliciting Material under §240.14a-12

Willdan Group, Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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MMMMMMMMMMMM + C 1234567890 000004 ENDORSEMENT_LINE______________ SACKPACK_____________ MR A SAMPLE DESIGNATION (IF ANY) ADD 1 ADD 2 ADD 3 ADD 4 ADD 5 ADD 6 Online Go to www.investorvote.com/WLDN or scan the QR code — login details are located in the shaded bar below. Important Notice Regarding the Availability of Proxy Materials for the Willdan Group, Inc. Annual Meeting of Stockholders to be Held on June 11, 2020 Under Securities and Exchange Commission rules, you are receiving this notice that the proxy materials for the annual stockholders’ meeting are available on the Internet. Follow the instructions below to view the materials and vote online or request a copy. The items to be voted on and location of the annual meeting are on the reverse side. Your vote is important! This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We encourage you to access and review all of the important information contained in the proxy materials before voting. The 2020 proxy statement and 2019 Annual Report to shareholders are available at http://ir.willdangroup.com/financial-information/annual-reports. www.investorvote.com/WLDN Easy Online Access — View your proxy materials and vote. Step 1: Step 2: Step 3: Step 4: Step 5: Go to www.investorvote.com/WLDN. Click on the icon on the right to view meeting materials. Return to the investorvote.com window and follow the instructions on the screen to log in. Make your selections as instructed on each screen for your delivery preferences. Vote your shares. When you go online, you can also help the environment by consenting to receive electronic delivery of future materials. Obtaining a Copy of the Proxy Materials – If you want to receive a copy of the proxy materials, you must request one. There is no charge to you for requesting a copy. Please make your request as instructed on the reverse side on or before May, 29, 2020 to facilitate timely delivery. + 2 N O T C O Y 038XEB MMMMMMMMM Annual Meeting Notice1234 5678 9012 345

The Willdan Group, Inc.’s Annual Meeting of Stockholders will be held on June 11, 2020 at 10:00am Pacific Daylight Time, virtually via the internet at www.meetingcenter.io/255118843. To access and vote during the virtual meeting, you must have the information that is printed in the shaded bar located on the reverse side of this form. The password for this meeting is — WLDN2020. Proposals to be voted on at the meeting are listed below along with the Board of Directors’ recommendations. The Board of Directors recommends a vote FOR the election of each of the nominees for director, FOR Proposal 2 and FOR Proposal 3. 1. Election of Directors 01 – Thomas D. Brisbin, 02 – Steven A. Cohen, 03 – Debra Coy, 04 – Raymond W. Holdsworth, 05 – Douglas J. McEachern 06 – Dennis V. McGinn, 07 – Keith W. Renken, 08 – Mohammad Shahidehpour 2. Ratification of the appointment of Crowe LLP as the independent registered public accounting firm for the year ending January 1, 2021. 3. Approval, on a non-binding advisory basis, of named executive officer compensation. NOTE: At their discretion, the proxies are authorized to vote and otherwise represent the undersigned on any other matter that may properly be brought before the Annual Meeting and at any adjournment or postponement thereof. PLEASE NOTE – YOU CANNOT VOTE BY RETURNING THIS NOTICE. To vote your shares you must go online or request a paper copy of the proxy materials to receive a proxy card. Here’s how to order a copy of the proxy materials and select delivery preferences: Current and future delivery requests can be submitted using the options below. If you request an email copy, you will receive an email with a link to the current meeting materials. PLEASE NOTE: You must use the number in the shaded bar on the reverse side when requesting a copy of the proxy materials. Internet – Go to www.investorvote.com/WLDN. Phone – Call us free of charge at 1-866-641-4276. Email – Send an email to investorvote@computershare.com with “Proxy Materials Willdan Group, Inc.” in the subject line. Include your full name and address, plus the number located in the shaded bar on the reverse side, and state that you want a paper copy of the meeting materials. To facilitate timely delivery, requests for a paper copy of proxy materials must be received by May, 29, 2020. — — — Annual Meeting Notice