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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. )

Filed by the Registrant ☒

Filed by a Party other than the Registrant ☐

Check the appropriate box:

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☐ | Preliminary Proxy Statement
☐ | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
☒ | Definitive Proxy Statement
☐ | Definitive Additional Materials
☐ | Soliciting Material under §240.14a-12

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WILLDAN GROUP, INC.

(Name of Registrant as Specified In Its Charter)

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

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Payment of Filing Fee (Check the appropriate box):

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☒ | No fee required.
☐ | Fee paid previously with preliminary materials.
☐ | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.
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​ | April 21, 2023 | ​
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​ | Notice of 2023 Annual Meeting and Proxy Statement ​
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COMPREHENSIVE. INNOVATIVE. TRUSTED.
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April 21, 2023

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Dear Willdan Stockholder:

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You are cordially invited to attend our 2023 Annual Meeting of Stockholders (the “Annual Meeting”) to be held on Thursday, June 8, 2023 at 10:00 a.m. Pacific Time. We will be hosting this year’s Annual Meeting via live audiocast on the Internet. To participate, vote or submit questions during the Annual Meeting via live audiocast, please visit: https://edge.media-server.com/mmc/p/tydzawp6. You will need the 15-digit control number included on your Notice of Internet Availability or your proxy card or voting instruction form (if you received a printed copy of the proxy materials) or included in the email to you (if you received the proxy materials by email) in order to be able to vote your shares or submit questions during the Annual Meeting. You will not be able to attend the Annual Meeting in person.

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| “Today, Willdan’s technical services are in high demand. We believe we are ideally positioned to provide the energy efficiency and engineering solutions that are needed in a changing energy world.” ​ Thomas Brisbin Chairman & CEO |  |  | ​
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We utilize the Internet as our primary means of furnishing proxy materials to our stockholders. We will mail a Notice of Internet Availability of Proxy Materials to our stockholders of record that did not request to receive a printed copy of our proxy materials on or about April 26, 2023 with instructions for accessing the proxy materials and voting via the Internet. The Notice of Internet Availability of Proxy Materials also provides information on how stockholders can obtain paper or email copies of the proxy materials if they so choose. Internet transmission and voting are designed to be efficient, cost-effective and preserve resources.

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Thank you for your continued support of Willdan. We look forward to your participation in the Annual Meeting.

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​ | /s/ Thomas D. Brisbin
​ | Thomas D. Brisbin
​ | Chairman of the Board and Chief Executive Officer

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Notice of 2023 Annual
Meeting of Stockholders

Annual Meeting of Stockholders
Date | Thursday, June 8, 2023
Time | 10:00 a.m. Pacific Time
Place | Virtual audiocast only at https://edge.media-server.com/mmc/p/tydzawp6.
Record Date | Close of business on April 18, 2023. A list of all stockholders entitled to vote at the Annual Meeting will be available for examination at our principal executive offices at 2401 East Katella Avenue, Suite 300, Anaheim, California 92806, for 10 days before the Annual Meeting, and during the Annual Meeting, such list will be available to registered stockholders as a link on the virtual meeting platform at https://edge.media-server.com/mmc/p/tydzawp6.

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Items of Business
Proposal |  | Board Recommendation
Item 1 | To elect the seven directors nominated by our Board of Directors to serve a one-year term or until their successors are duly elected and qualified or until their earlier resignation or removal | FOR
Item 2 | To ratify the appointment of Crowe LLP as our independent registered public accounting firm for fiscal year 2023 | FOR
Item 3 | To approve, on a non-binding advisory basis, our named executive officer compensation | FOR
Item 4 | To approve an amendment to the Company’s 2008 Performance Incentive Plan (the “2008 Plan”), including an increase in the number of shares available for grant under the 2008 Plan | FOR
Item 5 | To approve an amendment to the Company’s 2006 Employee Stock Purchase Plan (the “ESPP”), including an increase in the number of shares available for issuance under the ESPP | FOR
Item 6 | Consider and act on any other matter that may properly be brought before the Annual Meeting or any postponements or adjournment thereof | N/A

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HOW TO VOTE: YOUR VOTE IS VERY IMPORTANT

Dear Willdan Stockholders:

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Your vote is very important. We recommend you vote by proxy ahead of the Annual Meeting even if you plan to participate in, and vote at, the virtual Annual Meeting.

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If your shares are held in your name, you can vote by proxy in one of three convenient ways:

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Telephone | Internet | Mail
1-800-652-VOTE (8683) | www.investorvote.com/WLDN | Mark, sign, date and promptly mail the proxy card when received.
Follow the instructions provided in the separate proxy card or voting instruction form you received. | Follow the instructions provided in the Notice, separate proxy card or voting instruction form you received. | Send your completed and signed proxy card or voting instruction form to the address on your proxy card or voting instruction form.

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Refer to "Other Information—How do I vote?" in the Meeting and Voting Information section on page 75 of the accompanying proxy statement for a description of each voting method. Any proxy may be revoked by delivery of a later dated proxy or a written notice of revocation or by attending the Annual Meeting via live audiocast and voting your shares at that time. If you hold shares through someone else, such as an account with a brokerage firm, bank or other nominee, you will receive materials from your brokerage firm, bank or other nominee instructing you how to vote.

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​ | By Order of the Board of Directors
​ | /s/ Kate M. Nguyen
​ | Kate M. Nguyen
​ | Secretary

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Important Notice about the Availability of Proxy Materials. The Notice of the 2023 Annual Meeting, proxy statement, and our 2022 Annual Report on Form 10-K are available at www.proxyvote.com. You are encouraged to access and review all the important information contained in our proxy materials before voting.

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Virtual Annual Meeting

The Annual Meeting will be a completely virtual meeting of stockholders conducted through a live audio webcast at https://edge.media-server.com/mmc/p/tydzawp6, which will provide stockholders with the ability to participate in the Annual Meeting, vote their shares and ask questions.

Benefits of a Virtual Annual Meeting

■ | We believe a virtual-only meeting format facilitates stockholder attendance and participation by enabling all stockholders to participate fully, equally and without cost, using an Internet-connected device from any location around the world. In addition, the virtual-only meeting format increases our ability to engage with all stockholders, regardless of size, resources or physical location.
■ | Stockholders of record and beneficial owners as of April 18, 2023 (“Record Date”) will have the ability to submit questions directly to our management and Board and vote electronically at the Annual Meeting via the virtual-only meeting platform, with procedures designed to ensure the authenticity and correctness of your voting instructions.
■ | We believe that the virtual-only meeting format will give stockholders the opportunity to exercise the same rights as if they had attended an in-person meeting and believe that these measures will enhance stockholder access and encourage participation and communication with our Board of Directors and management.

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Attendance at the Virtual Annual Meeting

■ | All stockholders of our common stock as of the Record Date may attend the Annual Meeting at https://edge.media-server.com/mmc/p/tydzawp6 and vote their shares or ask questions during the Annual Meeting. Members of the public will also be permitted to attend the meeting, but will not be permitted to ask questions during the meeting.
■ | To attend and participate in the Annual Meeting by voting or asking questions, you will need the 15-digit control number included on your Notice of Internet Availability or your proxy card or voting instruction form (if you received a printed copy of the proxy materials) or included in the email to you (if you received the proxy materials by email).
■ | If you were a stockholder as of the Record Date, you may vote shares held in your name as the stockholder of record or shares for which you are the beneficial owner but not the stockholder of record electronically during the Annual Meeting through the online virtual annual meeting platform by following the instructions provided when you log in to the online virtual Annual Meeting platform.
■ | On the day of the Annual Meeting, stockholders may begin to log in to the virtual-only Annual Meeting beginning at 9:30 a.m., Pacific Time. The Annual Meeting will begin promptly at 10:00 a.m., Pacific Time. Please allow ample time for online login.
■ | We will have technicians ready to assist with any technical difficulties you may have accessing the Annual Meeting. If you encounter any difficulties accessing the virtual-only Annual Meeting platform, including any difficulties with your 15-digit control number or submitting questions, you may call the technical support number that will be posted on the Annual Meeting log-in page.
■ | Please be aware that you must bear any costs associated with your Internet access, such as usage charges from Internet access providers and telephone companies.

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Questions at the Virtual Annual Meeting

■ | Stockholders will have the opportunity to submit questions on the date of the Annual Meeting by following the instructions on the virtual-only Annual Meeting platform.
■ | Following the presentation of all proposals at the Annual Meeting, we will spend up to 30 minutes answering as many stockholder-submitted questions that comply with the meeting rules of conduct, which will be posted on the online virtual Annual Meeting platform. We will publish appropriate questions submitted in accordance with the Annual Meeting rules of conduct with answers, including those questions which were not addressed directly during the Annual Meeting due to time constraints, on our investor relations website at https://ir.willdangroup.com soon after the Annual Meeting. If we receive substantially similar questions, we will group such questions together and provide a single response to avoid repetition.

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YOU WILL NOT BE ABLE TO ATTEND THE ANNUAL MEETING IN PERSON

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Cautionary Statement Regarding Forward-Looking Information

This Proxy Statement contains statements that constitute forward-looking statements as that term is defined by the Private Securities Litigation Reform Act of 1995, as amended. These statements concern our business, operations and financial performance and condition as well as our plans, objectives and expectations for our business operations and financial performance and condition, which are subject to risks and uncertainties. All statements other than statements of historical fact included in this Proxy Statement are forward-looking statements. These statements may include words such as “aim,” “anticipate,” “assume,” “believe,” “can have,” “could,” “due,” “estimate,” “expect,” “goal,” “intend,” “likely,” “may,” “objective,” “plan,” “potential,” “positioned,” “predict,” “should,” “target,” “will,” “would” and other words and terms of similar meaning in connection with any discussion of the timing or nature of future operating or financial performance or other events or trends. For example, all statements we make relating to our plans and objectives for future operations, growth or initiatives and strategies are forward-looking statements.

These forward-looking statements are based on current expectations, estimates, forecasts and projections about our business and the industry in which we operate and our management’s beliefs and assumptions. We derive many of our forward-looking statements from our own operating budgets and forecasts, which are based upon many detailed assumptions. While we believe that our assumptions are reasonable, we caution that predicting the impact of known factors is very difficult, and we cannot anticipate all factors that could affect our actual results.

All of our forward-looking statements are subject to risks and uncertainties that may cause our actual results to differ materially from our expectations. Important factors that could cause actual results to differ materially from our expectations include, but are not limited to:

| ■ | our ability to adequately complete projects in a timely manner;

| ■ | our ability to compete successfully in the highly competitive energy services market;

| ■ | our reliance on work from our top ten clients;

| ■ | changes in state, local and regional economies and government budgets;

| ■ | our ability to win new contracts, to renew existing contracts and to compete effectively for contracts awarded through bidding processes;

| ■ | our ability to make principal and interest payments on our outstanding debt as they come due and to comply with the financial covenants contained in our debt agreements;

| ■ | our ability to manage supply chain constraints, labor shortages, rising interest rates, and rising inflation;

| ■ | our ability to obtain financing and to refinance our outstanding debt as it matures;

| ■ | our ability to successfully integrate our acquisitions and execute on our growth strategy;

| ■ | our ability to attract and retain managerial, technical, and administrative talent; and

| ■ | the extent to which the coronavirus (“Covid-19”) pandemic and measures taken to contain its spread ultimately impact our business, results of operation and financial condition.

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The above is not a complete list of factors or events that could cause actual results to differ from our expectations, and we cannot predict all of them. All written and oral forward-looking statements attributable to us, or persons acting on our behalf, are expressly qualified in their entirety by the cautionary statements disclosed under “Risk Factors,” “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and elsewhere in our Annual Report on Form 10-K for the fiscal year ended December 30, 2022, as such disclosures may be amended, supplemented or superseded from time to time by other reports we file with the Securities and Exchange Commission, including subsequent Annual Reports on Form 10-K and Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, and public communications. You should evaluate all forward-looking statements made in this Proxy Statement and otherwise in the context of these risks and uncertainties.

Potential investors and other readers are urged to consider these factors carefully in evaluating the forward-looking statements and are cautioned not to place undue reliance on any forward-looking statements we make. These forward-looking statements speak only as of the date of this Proxy Statement and are not guarantees of future performance or developments and involve known and unknown risks, uncertainties and other factors that are in many cases beyond our control. Except as required by law, we undertake no obligation to update or revise any forward-looking statements publicly, whether as a result of new information, future developments or otherwise.

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Table of Contents

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Proxy Summary | 7
Proposal 1: Election of Directors | 24
Recommendation of Board of Directors | 24
2023 Director Nominees | 24
Director Compensation | 29
Director Compensation Table | 29
Annual Retainer and Meeting Fees | 30
Restricted Stock Awards | 30
Proposal 2: Ratification of the Appointment of Crowe LLP as the Company’s Independent Registered Public Accounting Firm | 31
Audit and Other Fees | 31
Audit Committee Pre-Approval Policy | 31
Proposal 3: Approval, on a Non-Binding Advisory Basis, of Named Executive Officer Compensation | 33
Proposal 4: Amendment to 2008 Performance Incentive Plan | 34
Proposal 5: Amendment to 2006 Employee Stock Purchase Plan | 44
Executive Compensation | 49
Compensation Discussion and Analysis | 49
2022 Named Executive Officers | 50
2022 Say-on-Pay Vote and Executive Compensation Program | 50
Executive Compensation Program Objectives and Philosophy | 54
Role of the Compensation Committee | 55
Compensation Peer Group | 56
Role of Shareholder Say-on-Pay Votes | 56
Executive Compensation Program Elements | 56
Compensation of Executive Officers | 62
Grants of Plan-Based Awards in Fiscal 2022 | 64
Outstanding Equity Awards at Fiscal 2022 Year-End | 65
Option Exercises and Stock Vested in Fiscal 2022 | 66
Potential Payments Upon Termination or Change in Control | 66
Pay Ratio Disclosure | 67
Equity Compensation Plan Information | 72
Report of the Audit Committee | 73
Security Ownership Information | 74
Certain Relationships and Related Person Transactions | 76
Related Person Transactions | 76
Related Person Transaction Policy | 76
Other Information | 77
Solicitation of Proxies | 80
Householding of Stockholder Materials | 81
Annual Report on Form 10-K | 81
Stockholder Proposals | 81
Other Matters | 82
Appendix A | A-1
Appendix B | B-1
Appendix C | C-1

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Proxy Summary

This section contains summary information explained in greater detail in other parts of this proxy statement and does not contain all the information you should consider before voting. Stockholders are urged to read the entire proxy statement before voting. We will mail a Notice of Internet Availability of Proxy Materials to our stockholders of record that did not request to receive printed copy of our proxy materials on or about April 26, 2023 with instructions for accessing the proxy materials and voting via the Internet.

About Willdan

Willdan Group, Inc. (“we,” “our,” “us,” “Willdan” or the “Company”) is a provider of professional, technical and consulting services to utilities, private industry, and public agencies at all levels of government. As resource and infrastructure needs undergo continuous change, we help organizations and their communities evolve and thrive by providing a wide range of technical services for energy solutions, greenhouse gas reduction, and government infrastructure. Through engineering, program management, policy advisory, and software and data management, we plan, design and deliver trusted, comprehensive, innovative, and proven solutions to improve efficiency, resiliency, and sustainability in energy and infrastructure to our clients.

We believe our ability to provide innovation is enhanced by partnerships with our forward-thinking clients. We aim to create an environment that is diverse and inclusive, embracing the breadth of experience across our talent force with a culture of innovation and entrepreneurship. We are disciplined in our business delivering value to our clients. In supporting our clients, we seek to add value and provide long-term sustainable energy solutions, program management, engineering, and consultation.

Items Being Voted on and Board Recommendations

Proposal | Description | Board Vote Recommendation | Page Number With More Information
Item 1 | To elect the seven directors nominated by our Board of Directors (“Board”) to serve a one-year term or until their successors are duly elected and qualified or until their earlier resignation or removal | FOR | 24
Item 2 | To ratify the appointment of Crowe LLP (“Crowe”) as our independent registered public accounting firm for fiscal year 2023 | FOR | 31
Item 3 | To approve, on a non-binding advisory basis, our named executive officer compensation | FOR | 33
Item 4 | To approve an amendment to the Company’s 2008 Performance Incentive Plan (the “2008 Plan”), including an increase in the number of shares available for grant under the 2008 Plan | FOR | 34
Item 5 | To approve an amendment to the Company’s 2006 Employee Stock Purchase Plan (the “ESPP”), including an increase in the number of shares available for issuance under the ESPP | FOR | 44
Item 6 | Consider and act on any other matter that may properly be brought before the meeting or any postponements or adjournment thereof | N/A | N/A

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Proactive Stockholder Engagement

Stockholder feedback is integral to the Board’s decision making process and informs the Company’s policies, practices and disclosures. Throughout 2022, our Chief Executive Officer (“CEO”), President, Chief Financial Officer (“CFO”), and VP of Investor Relations, proactively contacted our institutional investors to discuss and solicit their feedback on various matters including on our corporate governance and executive compensation programs.

Outcomes of Stockholder Engagement

During 2022 meetings, stockholders expressed concerns related to certain areas of executive compensation, Board Governance, and Environmental, Social, and Governance (“ESG”) reporting. These concerns and our Board’s response to the feedback of our stockholders and proxy advisors are as follows:

● | Optimized the size of our Board of Directors in 2022;

● | Partnered with Circa, a national leader in diversity recruitment, to draw from a wider pool of candidates for open positions to find and hire the most qualified employees to serve our clients;

● | Reached 500 graduates and achieved over 40% participant job placement for Willdan’s Clean Energy Academy, which offers free training in energy efficiency skills to disadvantaged workers in New York City and the Los Angeles City area;

● | Conducted our second annual company-wide employee engagement survey. We expect to implement feedback received during 2023;

● | Re-instated the three-year performance period for the performance-based restricted stock units (“PBRSUs”) in our compensation program and eliminated the “one-year” performance period used in 2021 due to the Covid-19 pandemic;

● | Implemented a new metric in our performance-based restricted stock unit awards, a three-year Relative Total Shareholder Return;

● | Introduced time-based equity awards as part of the overall long-term equity compensation based on the recommendation of Pearl Meyer, the third party compensation consulting group hired by the Compensation Committee;

● | Updated our 2022 compensation peer group based on the recommendation of Pearl Meyer; and

● | Published our Sustainability Report in 2023.

2022 Performance Highlights

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Revenue | $429.1 Million
Net Income (Loss) | $(8.4) Million
Adjusted EBITDA(1) | $23.3 Million
Cash from Operations | $9.4 Million

| (1) | See Appendix C for the Company’s reconciliation of Net Income to Adjusted EBITDA.

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During 2022, we continued to take actions to strengthen our position as a leading energy consulting and municipal services provider. We delivered organic year over year revenue growth of 21%, reflecting increased demand for our services and benefitting from increased collaboration across our complementary technical disciplines.

We serve one of the most dynamic market segments in the world at one of the most exciting times. Demand for a cleaner, low carbon energy cycle is transforming the electric grid, building design and management, industrial production, and transportation networks. We help our clients evaluate new technical advances and implement sustainable cost effective solutions to advance and transform the delivery and consumption of energy and other government infrastructure.

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2023 Director Nominees

All of the director nominees are currently serving as directors of the Company and were previously elected to serve on the Board by our stockholders.

Our Board has recommended that all incumbent directors be re-elected at the Annual Meeting. The following table reflects information on the seven director nominees, including our board committee composition.

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Name |  |  | Age |  |  | Director Since |  |  | Positions Held with Willdan or Principal Occupation (Other Than Director) |  |  | Independent |  |  | AC |  |  | CC |  |  | NCG |  |  | SMAC
Thomas D. Brisbin | ​ | ​ | 70 | ​ | ​ | 2007 | ​ | ​ | Chairman and Chief Executive Officer | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Steven A. Cohen | ​ | ​ | 69 | ​ | ​ | 2015 | ​ | ​ | Lead Independent Director, Senior Vice Dean & COO - School of Professional Studies at Columbia University | ​ | ​ | X | ​ | ​ | M | ​ | ​ | ​ | ​ | ​ | M | ​ | ​ | C
Cynthia A. Downes | ​ | ​ | 62 | ​ | ​ | 2021 | ​ | ​ | President and CEO at Fide Professional Services | ​ | ​ | X | ​ | ​ | C | ​ | ​ | M | ​ | ​ | ​ | ​ | ​ | ​
Vice Admiral Dennis V. McGinn | ​ | ​ | 77 | ​ | ​ | 2017 | ​ | ​ | Retired, Assistant Secretary of the Navy for Energy, Installations, & Environment | ​ | ​ | X | ​ | ​ | ​ | ​ | ​ | C | ​ | ​ | M | ​ | ​ | M
Wanda K. Reder | ​ | ​ | 58 | ​ | ​ | 2021 | ​ | ​ | President and CEO at Grid-X Partners, LLC | ​ | ​ | X | ​ | ​ | ​ | ​ | ​ | M | ​ | ​ | M | ​ | ​ | ​
Keith W. Renken | ​ | ​ | 88 | ​ | ​ | 2006 | ​ | ​ | Managing Partner Renken Enterprises | ​ | ​ | X | ​ | ​ | M | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Mohammad Shahidehpour | ​ | ​ | 67 | ​ | ​ | 2015 | ​ | ​ | Bodine Chair Professor in the Electrical & Computer Engineering Department at the Illinois Institute of Technology | ​ | ​ | X | ​ | ​ | ​ | ​ | ​ | M | ​ | ​ | C | ​ | ​ | M
Each of the incumbent directors attended or participated in at least 83% of the total number of meetings of the Board and of the committees of the Board on which such director served, during the period for which such director served. During 2022, there were five board meetings held and all of our incumbent directors attended our 2022 annual meeting of stockholders. | ​ | ​ | Meetings Held in Fiscal 2022 | ​ | ​ | 5 | ​ | ​ | 7 | ​ | ​ | 5 | ​ | ​ | 4

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AC = Audit Committee | NCGC = Nominating and Corporate Governance Committee | C = Chairperson
CC = Compensation Committee | SMAC = Strategy, Mergers and Acquisitions Committee | M = Member

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The Board composition, including last year’s refreshment and leadership changes of the AC, CC, and NCGC, evidences our Board’s commitment to representing the long-term interest of shareholders through continuous effort to obtain representation of individuals from diverse backgrounds and with a range of skills, qualifications, experiences, and perspectives.

| (1) | One of our directors nominees self-identifies as Asian.

| (2) | Dr. Brisbin is our only non-independent director as he serves as our CEO.

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Executive Officer Compensation

Our Board's CC designs our executive compensation program to motivate our executives to execute our business strategies and deliver long-term stockholder value. We pay for performance with compensation dependent on our achieving financial and business performance objectives while aligning executives with the interests of our stockholders. A schematic of our compensation approach is shown below.

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Executive Officer Group Compensation Components(1)

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| (1) | See the Compensation Discussion and Analysis section below for a description of the manner in which these amounts are determined.

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Compensation Highlights

Underlying our compensation program is an emphasis on sound governance practices. These practices are summarized below and described in further detail in the Compensation Discussion and Analysis (“CD&A”) section below.

​ | ​ | ​ | ​
We Do
| Structure a significant portion of compensation to be at risk and tied to Company performance |  | Include clawback provisions for cash bonuses, PBRSUs, and time-based restricted stock awards.
| Perform annual say-on-pay advisory role for stockholders |  | Minimum vesting requirements
| Review officer compensation against our peer group |  | Deliver pay that is aligned with performance (below target for weak years and above target for strong years)
| Maintain stock ownership goals for management and all officers and non-employee directors | ​ | ​
| Utilize an independent external compensation consultant every two years whose independence is reviewed by CC |  |

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We Do Not
| Provide excise tax gross-up payments in connection with change in control severance benefits |  | Re-price or exchange outstanding options and PBRSUs
| Provide gross-ups to cover tax liabilities associated with executive perquisites |  | Grant stock options with an exercise price less than fair market value on the date of grant
| Allow directors, officers or employees to hedge or pledge company stock |  | Promise multiyear guarantees for bonus payouts or salary increases
| Pay out dividends or dividend equivalents on unvested equity awards |  |

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Sustainability, Human Capital, Community Responsibility and Corporate Governance

We are dedicated to environmental sustainability and the integration of the environmental, social and governance ("ESG") framework into our business practices and decision-making. We are committed to operating responsibly and ethically and to the protection of our planet as we grow our business in the communities where we live and work. Willdan’s goal is to reduce our ecological footprint and our environmental impact, as we help our clients reduce carbon intensity to become cleaner, more sustainable organizations, and to achieve their own sustainability goals. Our ESG framework spans the following six categories:

Our technical consulting services have a low carbon intensity, as we do not manufacture or distribute products, making our environmental impact relatively small. As a professional services firm, we believe our main contributors to environmental impact are leased office space, business travel, technology, and waste, primarily paper use.

Human Capital Management

Willdan brings together a purpose-driven team of engineers, scientists, consultants, program managers, technical specialists, and policy analysts from a wide variety of backgrounds to solve our clients’ challenges. At the end of FY 2022, we employed a total of 1,491 employees, excluding contractors. Our employees include, among others, licensed electrical, mechanical, structural, geotechnical and civil engineers; land surveyors; certified building officials; certified inspectors and plans examiners; licensed architects and landscape architects; certified planners; energy sales and audit specialists; installation technicians; program managers; policy advisors and information technology specialists.

Our goal is to maintain a culture of acceptance and individuality, where all employees feel respected, included, and encouraged to bring their unique perspectives, ideas, and skills to work each day. Our culture is focused on hiring, empowering, and retaining highly talented employees and professionals with the diverse background and expertise required to solve complex challenges, as energy and infrastructure transforms.

We regularly look for ways to grow our business and better support and invest in our people. We are committed to continued implementation of the feedback received from the company-wide employee engagement surveys. In 2022, led by our action committees, we implemented the top three employee initiatives from our inaugural survey. We

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launched our 2022 employee survey in late fiscal year 2022 and are in the process of analyzing the results with the goal to implement applicable feedback in 2023. We are committed to conducting future employee engagement surveys to listen to our people and take action to improve their lives and our business.

In 2022, we formed a partnership with Circa, a national leader in diversity recruitment, to foster an even broader diversity of our candidates to find for open positions and to hire the most qualified employees to best serve our clients.

Community Responsibility

To encourage more diversity and to encourage talented people to join our team, we partner with professional organizations that represent and support a diverse pool of applicants. We actively seek out and hire minority-owned subcontractors on our projects and, in conjunction with our clients, we regularly propose and achieve specific percentage content goals for the use of minority-owned and disadvantaged businesses in our projects. These partnerships offer economic opportunity to local, minority-owned, and disadvantaged business enterprises. At Willdan, we believe that we can better serve all communities by utilizing qualified employees, suppliers, and subcontractors that mirror the culture and demographics of the communities where we live and work.

To support workplace development and the communities we serve, training is offered to our employees and for those who wish to join the growing clean energy sector. In 2022, the Willdan Clean Energy Academy celebrated 500 graduates and 200 job placements in the green workforce , with 70% of those students coming from disadvantaged communities and/or priority populations.

Corporate Governance

Under the direction of the Board, we have designed our corporate governance program to promote compliance with applicable laws and regulations, the rules of the Securities and Exchange Commission (“SEC”) and the listing standards of the Nasdaq Stock Market (the “Nasdaq Rules”) and to reflect best practices of other public companies.

We are committed to operating with honesty and integrity and maintaining the highest level of ethical conduct. We encourage stockholders to visit the Corporate Governance section on our website at ir.willdangroup.com/corporate-governance, which includes the following corporate governance documents:

| ■ | Code of Ethical Conduct

| ■ | Charters for our Board’s Audit Committee (“AC”), Compensation Committee (“CC”), Nominating and Corporate Governance Committee (“NCGC”), and Strategy, Mergers and Acquisitions Committee (“SMAC”)

| ■ | Insider Trading Policy

| ■ | Management Stock Ownership Guidelines for Executives and Non-Employee Directors

Information on our website is not and should not be considered part of, nor is it incorporated by reference in this proxy statement. You can receive copies of these documents, without charge, by written request mailed to our Corporate Secretary at Willdan Group, Inc., 2401 E. Katella Avenue, Suite 300 Anaheim, California 92806.

Our 24-hour hotline (“Whistleblower Policy”) is managed by an outside party that is available to all employees for the anonymous submission of complaints by telephone and internet. All complaints received from our 24-hour hotline go directly to our AC chair and to our Lead Independent Director. During fiscal 2022, we did not receive any complaints relating to accounting, internal controls, or auditing matters.

Willdan conducts its business on the basis of the quality of its services and the integrity of its association with its clients and others. Our Code of Ethical Conduct demonstrates our commitment to ascribing to the highest standards of ethical conduct in the pursuit of our business and applies to all of our directors, officers, and employees. Our employees are trained on and affirm their commitment to complying with the policies when they first join our Company and regularly thereafter. Our Company has a written “related person transaction” policy. Under the policy, the AC reviews and approves transactions between Willdan and “related persons” (as defined in the policy). See the section “Certain Relationships and Related Person Transactions - Related Persons Transaction Policy” for more information.

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Willdan Board of Directors

Overview

Our Board of Directors is responsible for overseeing, counseling, and directing management in serving the long-term interests of our Company and stockholders, with the goal of building long-term stockholder value and ensuring the strength of our Company for our clients, associates, employees, and other stakeholders. In this capacity, the Board’s primary responsibilities include establishing an effective corporate governance program with a board and committee structure that ensures independent oversight; overseeing our business practices, strategies, and risks; maintaining the integrity of our financial statements; evaluating the performance of our senior executives and determining their compensation; undertaking succession planning for our CEO, other senior executives and directors; and reviewing our 2008 Amended and Restated Performance Incentive Plan (“2008 Plan”) and significant strategic and operational objectives and actions.

Director Independence

The Board has determined that each of Messrs. Cohen, McGinn, Renken and Shahidehpour and Mss. Downes and Reder, and each of our former directors who did not seek re-election at the 2022 annual meeting of stockholders, Messrs. Holdsworth and McEachern and Ms. Coy, are independent pursuant to the applicable independence requirements set forth in the rules of the listing standards for the Nasdaq Stock Market (the “Nasdaq Rules”) and by the SEC because they either have no relationship with the Company (other than as a director and stockholder) or because any relationship they have with the Company is immaterial. Under these standards of independence, for a director to be considered independent, the director must, among other things, not be an executive officer or employee of the Company or its subsidiaries and the director must not have a relationship which, in the opinion of the Board, would interfere with the exercise of independent judgment in carrying out the responsibilities of a director. Dr. Brisbin, due to his employment as our CEO, does not qualify as independent.

Board Leadership Structure

Our Board does not have a policy with respect to whether the roles of CEO and Chairman should be separated or combined. We currently have a combined Chairman/CEO role as well as a Lead Independent Director. We believe that the combined Chairman/CEO role is appropriate at this time because it fosters clear accountability, effective decision-making, and alignment on corporate strategy. We believe combined leadership at the top also provides the necessary flexibility for us to rapidly address the changing needs of our business.

In November 2016, the Board elected Thomas D. Brisbin, Willdan’s CEO, as Chairman of the Board. From March 2017 to March 2021, Keith W. Renken served as Lead Independent Director of the Board. In March 2021, the Board appointed Steven A. Cohen as Lead Independent Director. Although we have in the past separated the roles of CEO and Chairman of the Board, the Board believes that having Dr. Brisbin serve in both these roles, coupled with strong independent oversight by the Board and Lead Independent Director, is the most appropriate and effective board leadership structure for us at this time.

Board Committees

The Board has four standing committees: the AC, the CC, the NCGC and the SMAC. Each of our Board committees has a separate written charter that describes its purposes, membership, meeting structure, authority, and responsibilities. These charters, which may be found in the Corporate Governance section of our website at ir.willdangroup.com/corporate-governance, are reviewed annually by the respective committee, with any recommended changes adopted upon approval by our Board.

Each of these committees regularly reports to the Board as a whole. The following summaries identify the members of each committee as of the date of this Proxy Statement. The composition of each committee may change from time to time. In 2022, the composition of all four standing committees were updated and approved by the Board.

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Board Skills, Experience, and Diversity Matrix

Our amended and restated bylaws provide that the authorized number of directors of the Board shall be set by a resolution of the Board. The Board has fixed the number of directors at seven. We believe a limited number of directors helps maintain personal and group accountability. All of our current directors have been nominated for election by the Board upon recommendation by the NCGC. Although the Company does not have a formal policy regarding attendance by members of the Board at the Company's annual meeting of stockholders, the Company encourages directors to attend. The following matrix provides information regarding the members of our Board as of April 21, 2023:

​ ​ ​ ​ ​ ​ ​ ​ ​ |  |  |  |  |  |  |
| Thomas D. Brisbin | Steven A. Cohen | Cynthia A. Downes | Dennis V. McGinn | Wanda K. Reder | Keith W. Renken | Mohammad Shahidehpour
SKILLS AND EXPERIENCE | ​ | ​ | ​ | ​ | ​ | ​ | ​
Senior Leadership | ● | ● | ● | ● | ● |  | ●
Industry & Technical Expertise | ● | ● | ● | ● | ● |  | ●
Client Regulatory |  | ● |  | ● | ● |  |
Business Development and M&A | ● | ● | ● | ● | ● |  | ●
Financial Sophistication | ● | ● | ● |  | ● | ● |
Talent Management & Compensation | ● |  |  | ● | ● | ● | ●
Governance & Risk Oversight | ● | ● | ● | ● |  | ● | ●
Public Board |  |  |  |  |  | ● |
Innovation & Technology |  |  |  | ● | ● |  | ●
TENURE AND INDEPENDENCE | ​ | ​ | ​ | ​ | ​ | ​ | ​
Tenure (years) | 15 | 8 | 1 | 6 | 1 | 17 | 8
Independence | ​ | ● | ● | ● | ● | ● | ●
DEMOGRAPHICS |  |  |  |  |  |  |
Age | 70 | 69 | 62 | 77 | 58 | 88 | 67
Gender Identity | M | M | F | M | F | M | M
African American or Black | ​ | ​ | ​ | ​ | ​ | ​ | ​
Alaskan Native or Native American | ​ | ​ | ​ | ​ | ​ | ​ | ​
Asian | ​ | ​ | ​ | ​ | ​ | ​ | ●
Hispanic or Latinx | ​ | ​ | ​ | ​ | ​ | ​ | ​
Native Hawaiin or Pacific Islander | ​ | ​ | ​ | ​ | ​ | ​ | ​
White/Caucasian | ● | ● | ● | ● | ● | ● |
LGBTQ+ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Military Veteran | ​ | ​ | ​ | ● | ​ | ​ | ​

*The matrix is intended to be a high-level summary and not an exhaustive list of each director’s skills or contributions to the Board.

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Corporate Governance Policies

Our corporate governance policies are reviewed at least annually and amended from time to time to reflect the beliefs of our Board, changes in regulatory requirements, evolving best practices, and recommendations from our stockholders.

Matter |  | Description of Policy
​ | ​ | ​
Board Composition | ​ | § Fixed Number. Our Board is currently fixed at seven directors until changed by the Board.
Director Independence | ​ | § Majority Independent. Eighty-six percent of our directors satisfy applicable Nasdaq and SEC independence standards.
​ | ​ | § Regular Executive Sessions. Our independent directors meet in executive session following each meeting of the Board, each meeting of the AC, and as needed following other committee meetings.
Board Leadership Structure | ​ | § Lead Independent Director. Since our CEO is also Chairman of the Board, our directors have collectively appointed one of our independent directors to serve as Lead Independent Director with established roles and responsibilities. See the Board Leadership Structure section above for further details.
​ | ​ | § Annual Review. The Board annually reviews its leadership structure and appoints the Chairman of the Board and determines whether the positions of Chairman of the Board and CEO will be held by one individual or separated.
Board Committees | ​ | § Independence. Board Committees are comprised only of independent directors.
​ | ​ | § Governance. Board Committees act under charters evaluated annually that set forth their purposes and responsibilities. The charters allow for engagement, at our expense, of independent legal, financial, or other advisors the committee members deem necessary or appropriate.
​ | ​ | § Attendance. Directors are expected to attend all meetings of the Board and the committees on which they serve, and are strongly encouraged to attend our annual stockholder meetings.
Director Qualifications |  | § Diverse and Relevant Experience. The NCGC works with the Board to determine the appropriate characteristics, skills, and experiences for the directors. We are committed to selecting qualified candidates regardless of gender, ethnicity, and national origin.
Board Duties |  | § Succession Planning. The NCGC works on a periodic basis with the CEO to review, maintain, and revise, as necessary, the Company's succession plan. The CEO reports annually to the Board on succession planning for CEO and senior management positions, including a discussion of assessments, leadership development plans and other relevant factors.
|  | § Financial Reporting, Legal Compliance, and Ethical Conduct. Our Board maintains governance and oversight functions, but our executive management maintains primary responsibility.
Continuous Board Improvement |  | § New Director Orientation. All new directors participate in an orientation program to familiarize them with our Company.
|  | § Continuing Education. Directors continue their education through meetings with executive management and other managers to enhance the flow of meaningful financial and business information. They also receive presentations to assist with their continuing education. Directors also attend outside director education programs to stay informed about relevant issues.
|  | § Annual Evaluations. The NCGC oversees an annual board performance evaluation policy that includes individual director self-assessments and an assessment of each of the Board’s four standing committees.

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Audit Committee
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Meetings in FY 2022: | 5 | Average Attendance in FY 2022: | 100%

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Chair: | ​ | ​
Cynthia A. Downes | ​ | § Oversee the integrity of the Company’s financial statements and financial reporting
​ | ​ | ​
Members: | ​ | § Oversee compliance with legal and regulatory requirements
Steven A. Cohen Keith W. Renken | ​ | ​
| ​ | § Discuss policies with respect to risk assessment, monitoring and mitigation with management and independent auditor
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All members satisfy the audit committee experience and independence standards required by the Nasdaq Rules and the Exchange Act and have been determined to be financially literate in accordance with the Nasdaq Rules. | ​ | § Review qualifications and independence of the Company’s independent registered public accounting firm
| ​ | ​
| ​ | § Review performance of the Company’s internal reporting and audit functions
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Under applicable SEC regulations, Ms. Downes has been determined to be an "audit committee financial expert". | ​ | § Oversee the Company’s disclosures controls and procedures and system of internal controls regarding finance, accounting, legal compliance and ethics
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| ​ | § Retain and oversee the independent auditor and review and approve the scope of the audit conducted by the independent auditor

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Compensation Committee
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Meetings in FY 2022: | 7 | Average Attendance in FY 2022: | 86%

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Chair: | ​ | ​
Vice Admiral Dennis V. McGinn | ​ | § Produce an annual report on executive compensation for inclusion in the Company’s proxy statement, if and as required by applicable rules and regulations § Review, evaluate and make recommendations to the full Board with respect to management’s proposals regarding the Company’s overall compensation policies, and recommend performance-based incentives that support and reinforce the Company’s long-term strategic goals, organization objectives and stockholder interests. § Annually review and approve objectives relevant to the Chief Executive Officer’s compensation, evaluate the Chief Executive Officer’s performance in light of those objectives and set the Chief Executive Officer’s compensation level based on this evaluation.
​ | ​ | ​
Members: Cynthia A. Downes Wanda K. Reder Mohammad Shahidehpour ​ | ​ | § Consider and approve the selection, retention and remuneration arrangements for senior executive officers and establish, review and approve compensation plans in which any executive officer is eligible to participate.
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All members satisfy the independence standards required by the Nasdaq Rules and Exchange Act. | ​ | § Make recommendations to the Board with respect to the Company’s incentive-compensation plans and equity-based compensation plans and approve for submission to stockholders all new stock option and equity compensation plans, including amendments or supplements thereto
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​ | ​ | § Administer the Company’s 2008 Plan, 2006 Stock Incentive Plan (the “2006 Plan”) and the ESPP
All members qualify as "nonemployee directors" under Rule 16b-3 of the Securities Exchange Act of 1934, as amended. | ​ | ​
| ​ | § Authorized to retain and terminate any compensation consultant engaged to assist in the evaluation of the compensation of our senior executive officers including all NEOs (as defined below)
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Nominating & Corporate Governance Committee
Meetings in FY 2022: | 5 | Average Attendance in FY 2022: | 95%

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Evaluate the size and composition of the Board, review and develop critieria for Board membership, and evaluate the independence of existing and prospective directors | ​ | ​
Chair: | ​ | ​
Mohammad Shahidehpour | ​ | § Evaluate the size and composition of the Board, review and develop criteria for Board membership, and evaluate the independence of existing and prospective directors
​ | ​ | ​
Members: Steven A. Cohen Vice Admiral Dennis V. McGinn Wanda K. Reder | ​ | § Actively seek and evaluate qualified individuals to become new directors as needed , establish procedures to solicit, review and recommend to the Board potential director nominees proposed by stockholders and recommend to the Board the director nominees for the annual meeting of stockholders and any special meeting at which directors are elected § Review the suitability of each Board member for continued service when his or her term expires and when he or she has a significant change in status § Take diversity considerations into account when identifing director candidates
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All members satisfy the independence standards required by the Nasdaq Rules and Exchange Act | ​ | § Evaluate the nature, structure and operations (including authority to delegate to subcommittees) of other Board committees
​ | ​ | § Periodically review and, in the NCGC’s discretion, recommend to the Board changes to, the Company’s certificate of incorporation, bylaws, corporate governance policies and practices, and other present or future policies of the Company as they relate to corporate governance matters
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Strategy, Mergers and Acquisitions Committee
Meetings in FY 2022: | 4 | Average Attendance in FY 2022: | 100%

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Chair: | ​ |
Steven A. Cohen | ​ | § Review with management, on a timely basis, significant financial matters of the Company and its subsidiaries, including matters relating to the Company’s capitalization, dividend policy and practices, credit ratings, cash flows, borrowing activities, and investments including mergers and acquisitions
​ | ​ |
​ | ​ | § Review and recommend to the Board or take actions on behalf of the Board relating to the Company’s financial and strategic plans
Members: | ​ | ​
Vice Admiral Dennis V. McGinn Mohammad Shahidehpour | ​ | § Review and recommend to the Board actions relating to offerings of the Company’s debt or equity securities, purchases or disposals of treasury shares, except the repurchase of shares pursuant to approved employee benefit plans, stock splits or reclassification of shares any dividend declaration, guarantees of unconsolidated third party indebtedness and certain other financial transactions and strategies
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​ | ​ | § In consultation with the AC, as appropriate, review periodically the Company’s risk management strategies
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​ | ​ | § Be available to management as needed regarding various matters such as reviewing the relationships with the Company’s principal lending institutions and investment and strategic advisors

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Executive Sessions

Our Board believes it is important to have executive sessions without our CEO or other management being present. Executive sessions are led by our Lead Independent Director. Our independent directors have robust and candid discussions at these executive sessions during which they can critically evaluate the performance of our company, CEO, and management. An executive session is held in conjunction with each regularly scheduled quarterly Board meeting and other sessions may be called by the Lead Independent Director in his own discretion or at the request of the Board.

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Oversight of Risk Management

The Board is involved in risk oversight through direct decision-making authority with respect to fundamental financial and business strategies and major corporate activities, including material acquisitions and financings, as well as through its oversight of management and the committees of the Board. Management is responsible for identifying the material risks facing the Company, implementing appropriate risk management strategies, and ensuring that information with respect to material risks is shared with the Board or the appropriate Board committee. In connection with this responsibility, members of management provide regular reports to the Board, with reporting in the areas of enterprise risks, cybersecurity and information security, sustainability, human capital management, other ESG matters, and succession planning.

Cybersecurity is a critical part of risk management at Willdan. The Board as a whole regularly reviews risks related to cybersecurity and the Company’s information system controls. The Company uses third-party vendors to independently tests information security risks. In 2020, the Company completed an ISO/IEC 27001:2013 certification process for some of its information security systems and, in 2022, the Company completed a Systems and Organization Controls 2 (“SOC 2”) certification process for some of its information security systems. These certifications are audited and verified by third-parties on an annual basis. We take cyber threats very seriously and regularly audit our cyber security capabilities. These audits are a useful tool for ensuring that we maintain a robust cyber security program to protect our investors, customers, employees, and intellectual property. The Company has information security training and compliance programs which regularly tests employees and executives on items such as phishing attacks. We also maintain a cyber security insurance program which is reviewed on an annual basis. The oversight responsibility of the Board and its committees is supported by Company management and the risk management processes that are currently in place.

Policy on Hedging and Pledging

The Company recognizes that hedging against losses in Company stock is not appropriate or acceptable trading activity for individuals employed by or serving the Company. The Company has incorporated prohibitions on various hedging activities (such as prepaid variable forward sale contracts, collars, equity swaps, or exchange funds) that are designed to hedge or offset any decrease in the market value of Company securities without the full risks and rewards of ownership within its insider trading policy, which policy applies to directors, officers and employees of the Company and their family members. The policy prohibits trading in any interest or position relating to the future price of Company securities, such as put, call or short sale. This policy also applies regardless of whether such Company securities (i) were granted to the director, officer or employee as part of their compensation or (ii) are held directly or indirectly by the director, officer or employee.

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Executive Development and Succession Planning

Our Board is involved in the identification and cultivation of our future leaders. The NCGC works on an annual basis with the CEO to review, maintain and revise, as necessary, the Company’s succession plan upon the CEO's retirement and in the event of an unexpected occurrence. The CEO reports annually to the Board on succession planning for the CEO and senior management positions, including a discussion of assessments, leadership development plans and other relevant factors. The CEO also makes available to the NCGC on a continuing basis, the CEO's recommendations regarding his successor should he become unexpectedly disabled.

Stockholder Submission of Director Nominees

The NCGC will consider director candidates recommended by stockholders. Properly communicated stockholder recommendations will be considered in the same manner and using the same criteria as used for any other director candidate. To be properly communicated, stockholders desiring to recommend candidates for consideration by the NCGC and the Board should submit their recommendations in writing to the NCGC Chair, c/o Corporate Secretary, Willdan Group, Inc. 2401 East Katella Avenue, Suite 300, Anaheim, CA 92806, together with all information about the stockholder and the candidate that would be required pursuant to Section 3.04(a)(ii) of our Bylaws if the stockholder was nominating the candidate for election to the Board. The NCGC may request additional information concerning such director candidate as it deems reasonably required to determine the eligibility and qualification of the director candidate to serve as a member of the Board. For a discussion of the factors and other criteria the NCGC and Board will consider when evaluating a director candidate, see “Proposal 1: Election of Directors.”

Please note that stockholders who wish to nominate a person for election as a director in connection with an annual meeting of stockholders (as opposed to making a recommendation to the NCGC as described above) must deliver written notice to our Secretary in the manner described in Section 3.04(a)(ii) of our Bylaws and otherwise in accordance with SEC regulations, and as further described in the Meeting and Voting Information section of this proxy statement under "Requirements for Proposals to be Considered for Inclusion in Proxy Materials and for Nomination of Director Candidates.”

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Director Qualifications

Qualifications that are particularly desirable for our directors to possess in order to provide oversight and stewardship of our company include the following:

Qualifications | ​ | ​ | Descriptions | ​ | ​ | Value to Our Board and Stockholders
Senior Leadership Experience | ​ | ​ | Service in a senior executive position | ​ | ​ | Provide us with valuable external perspectives with which to assess our operations, execute our strategies, mitigate related risks, and improve our policies and procedures.
Industry and Technical Experience | ​ | ​ | Experience in consulting and engineering services that focus on energy efficiency, the environment, sustainable infrastructure, renewable energy and energy transition | ​ | ​ | Allow us to better understand the needs of our clients in developing our business strategies, as well as evaluate acquisition and divestiture opportunities.
Client Regulatory Experience | ​ | ​ | Service in a position that requires interaction with utilities, municipalities, and commercial clients | ​ | ​ | Provides us with experience and insight into working constructively with utility commissions, state and local agencies and administrators and addressing significant public policy and regulatory compliance issues in areas related to our business and operations.
Business Development and M&A Experience | ​ | ​ | Background in business development and in the analysis of proposed M&A transactions | ​ | ​ | Provides us with insight into developing and implementing strategies for growing our business through combinations with other organizations, including analysis of the "fit" of a proposed acquisition with our company's strategy, the valuation of the transaction, and the management plan for integration with existing operations.
Financial Sophistication | ​ | ​ | Understanding of accounting, auditing, tax, banking, insurance, or investments | ​ | ​ | Help us to oversee our accounting, financial reporting, and internal control processes; manage our capital structure; optimize capital allocation; and undertake significant transactions.
Talent Management / Compensation Experience | ​ | ​ | Practical experience developing, managing, motivating, and compensating employees | ​ | ​ | Provide us with insight into cultivating an inclusive culture consistent with our values and purpose, providing an engaging work environment, attracting top talent, investing in our employees, supporting their career development, and remaining competitive in the marketplace.
Governance and Risk Oversight Experience | ​ | ​ | Practical experience in risk governance, enterprise risk management framework, and knowledge, understanding of risk monitoring and mitigation | ​ | ​ | Help us understand enterprise risk management program structures as well as practices and policies designed to identify and manage risks and properly align risk-taking with overall governance and operations.
Public Board Experience | ​ | ​ | Prior or concurrent service on other SEC reporting company boards | ​ | ​ | Demonstrates understanding of the extensive and complex oversight responsibilities of directors and helps reinforce management accountability for maximizing long-term stockholder value. Also provides insights into a variety of strategic planning, compensation, finance, and governance practices.
Innovation / Technology Experience | ​ | ​ | Practical experience with technology transformation and disruption | ​ | ​ | Allow us to better understand and anticipate technical trends, generate disruptive innovation, and extend and create new business models.

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The grid below summarizes the qualifications of our director nominees:

​ ​ ​ |  |  |  |  |  |  |  |
Number of Nominees |  |  |  |  | Qualifications of Director Nominees
6 |  |  |  |  |  |  | Senior Leadership Experience |
6 |  |  |  |  |  |  | Industry and Technical Expertise |
3 |  |  |  |  |  |  | Client Regulatory Experience |
6 |  |  |  |  |  |  | Business Development and M&A Experience
5 |  |  |  |  |  |  | Financial Sophistication |
5 |  |  |  |  |  |  | Talent Management/Compensation Experience
6 |  |  |  |  |  |  | Governance and Risk Oversight Experience
1 |  |  |  |  |  |  | Public Board Experience |
3 |  |  |  |  |  |  | Innovation/Technology Experience

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Board Refreshment

Our governance policies reflect our belief that directors should not be subject to term limits. While term limits could facilitate fresh ideas and viewpoints being consistently brought to the Board, we believe they are counterbalanced by the disadvantage of causing the loss of a director who over a period of time has developed insight into our strategies, operations, and risks and continues to provide valuable contributions to Board deliberations. This practice balances the institutional knowledge of our longer-tenured directors with the fresh perspectives brought by our newer directors.

Our Board has shown an ongoing commitment to board refreshment and to having highly qualified and independent perspectives. Of our seven director nominees, two were added in 2021.

Director Diversity

Our Company recognizes the value of diversity and we endeavor to a have a diverse Board with experiences in business, technology, finance, business development, government, energy, risk management, and public board experience. Our NCGC continues to seek diverse candidates as board positions become available. Board gender and ethnic diversity has become a significant selection factor in our Board selection process. In addition to gender and ethnic diversity, the NCGC focuses on skills, expertise, and background of director nominees to complement the existing Board in light of the diverse and national nature of our businesses and operations. We enhanced our gender diversity on the Board in 2021, appointing two women independent directors. As of April 21, 2023, three of our seven directors self-identify as “diverse” as such term is defined in Rule 5605(f) of The Nasdaq Stock Market LLC (“Nasdaq”).

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Active Stockholder Engagement and Communications

Stockholder Engagement

We believe that engaging with investors is fundamental to our commitment to good governance. Our CEO, President, CFO, and VP of Investor Relations regularly seek opportunities to engage with our investors to gain and share valuable insights into current and emerging business and governance trends that our shareholders tell us matter most to them. In addition, we seek opportunities to connect with our investors to increase their understanding of our business, our long-term growth strategy, our executive compensation philosophy and program, risk management and our commitment to corporate governance, environmental and social issues. In addition to senior management, members of our Compensation Committee are available for consultation with our major shareholders when requested.

The Company continues to receive constructive feedback from ESG investors, many of whom are European-based. These European-based funds have a particular focus on measuring our performance and related disclosure of ESG metrics. The Company issued its 2022 sustainability report in early April 2023.

In 2022, we met with over 85 investors, representing over 58% of our shares of common stock outstanding as of year-end

Topics discussed include our energy efficiency contracts with independent owned utilities, performance period length and metrics for our equity compensation program, balance sheet capitalization, growth strategy, risk management practices, and our focus on sustainability and governance practices. These meetings were conducted in person, via teleconference, via videoconference, or one-on-one at industry conferences. Our engagement activities take place throughout the year and we also conduct quarterly earnings calls where we try to answer many of the new questions that we receive during our investor outreach.

Communications With the Board

Stockholders and other interested parties who wish to communicate with the Board or non-management directors of the Company can send an email to nonmanagementdirectors@willdan.com or send their correspondence to Board of Directors (or a particular subgroup or individual director), c/o Corporate Secretary, Willdan Group, Inc., 2401 E. Katella, Suite 300 Anaheim, California 92806.

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Proposal 1:

Election of Directors

Our Board is currently fixed at seven directors, each to be elected on an annual basis, until changed by the Board. All of the director nominees are currently serving as directors. Each of the director nominees, if elected at the Annual Meeting, will hold office until the 2024 annual meeting of stockholders and until his or her successor has been elected and qualified, or until his or her earlier resignation or removal.

Each director nominee has consented to be nominated and to serve if elected. We have no reason to believe that any of the director nominees will be unavailable for election or unable to serve if elected. However, if any director nominee is unavailable for election or unable to serve, the proxy holders may vote for another person nominated by the Board or the Board may adopt resolutions to reduce the number of directors to be elected at the Annual Meeting.

Recommendation of Board of Directors

Our Board of Directors recommends that you vote “FOR” each of the director nominees.

2023 Director Nominees

The following pages provide information on each nominee for election at the Annual Meeting, including his or her age, Board leadership roles held, and business experience during at least the past five years. We also indicate the name of any other public company for which each nominee currently serves as a director or served as a director during the past five years.

The information relating to each director nominee led our Board to the conclusion that he or she should be elected as a director in light of the Company's business and structure. We believe that each of these director nominees has integrity and adheres to our high ethical standards. In addition, each nominee has demonstrated the ability to exercise sound judgment as well as a commitment to servicing the long-term interests of our stockholders.

The Company believes that the members of the Board should have a range of skills, experience, diversity and expertise that enables the Board to provide sound guidance with respect to the Company’s operations and interests. When considering a director candidate, the Board looks at the current composition of the Board and the evolving needs of the Company, in addition to such candidate’s background and accomplishments. The NCGC identifies new candidates for election to the Board, reviews their qualifications, skills, experience and other characteristics and recommends nominees for director to the Board for approval.

The Board seeks directors with strong reputations and experience in areas relevant to the strategy and operations of the Company’s businesses, particularly in energy efficiency, engineering, consulting and finance. All of the director nominees hold or have held senior executive positions in large, complex organizations and have operating experience that meets these objectives, as described below. In these positions, they have gained experience in core management skills, strategic and financial planning, public company financial reporting, corporate governance, risk management and leadership development. Additionally, a number of our directors have experience serving on the boards of directors of other public companies, which the Company believes increases their knowledge of effective corporate governance.

The Board also believes that each of the director nominees and current directors has other key attributes that are important to an effective board, including integrity and demonstrated high ethical standards, sound judgment, analytical skills, the ability to engage management and each other in a constructive and collaborative fashion, diversity of background, experience and thought and the commitment to devote significant time and energy to serve on the Board and its Committees. The following biographies provide further qualifications, attributes and other information with respect to the director nominees.

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Dr. Thomas D. Brisbin | Chairman and Chief Executive Officer | Director Since 2007
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​ | Experiences § CEO and Director since 2007. Chairman since November 2016. President from April 2007 to November 2016 § Vice President and Consultant of AECOM Technology Corporation from 2004-2007 § Chief Operating Officer and Executive VP at Tetra Tech, Inc. from 1999-2004 § Co-founder and President of PRC Environmental Management, Inc. from 1978-1995 § Research Associate at Argonne National Laboratory and Adjunct Professor - Illinois Institute of Technology (IIT) prior to PRC
Age: 70 Board Committees: None. | Skills and Qualifications Senior leadership; industry & technical experience; business development and M&A; financial sophistication; talent management & compensation; governance & risk oversight § B.S. Northern Illinois University. Ph.D. Environmental Engineering Illinois State Technology § Completed Harvard Business School's Advanced Management Program

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Steven A. Cohen | Independent | Director Since 2015
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​ | Experiences § Senior Vice Dean and Chief Operating Officer of the School of Professional Studies at Columbia University (CU). Directs CU's Master of Sustainability Management Program. Professor in the Practice of Public Affairs at CU's School of International and Public Affairs. Director of CU's Master of Public Administration Program in Environmental Science and Policy § Consultant to U.S. Environmental Protection Agency for past three decades, most recently from 2005-2010 § Served on the U.S. Environmental Protection Agency’s Advisory Council on environmental Policy and Technology from 2001-2004 § Director of Columbia's Graduate Program in Public Policy and Administration from 1985 to 1998 § Former policy analyst for U.S. Environmental Protection Agency before joining CU in 1981
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Age: 69 | ​ | Skills and Qualifications | ​
​ | Senior leadership; industry & technical expertise; client regulatory; business development and M&A; financial sophistication; governance & risk oversight § BA Political Science from Franklin College; M.A. Political Science from University of New York at Buffalo (SUNY-Buffalo) § Ph.D. Political Science from SUNY-Buffalo
Board Committees: Lead Independent Director; Chairperson, Strategy, Mergers and Acquisitions Committee; Member, Audit Committee; Member, Nominating & Corporate Governance Committee |
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Cynthia A. Downes | Independent | Director Since 2021
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​ | Experiences § President and CEO of Fide Professional Services, which she founded in 2017 § Chief Financial Officer of Constant and Associates, Inc. from 2020 to 2022 § Accounting & Finance leadership consulting services for Guidehouse, a $1B+ consulting firm, from 2018 to 2019 § Executive Vice President, Chief Financial Officer and Treasurer at Versar, Inc. (NYSE:VSR) from 2011 to 2017 § Vice President and Chief Financial Officer of Environmental Design International Inc. from 2009 to 2011 and Vice President of Finance of GDI Advanced Protection Solutions from 2008 to 2009 § Previously spent 15 years at Tetra Tech, Inc. (Nasdaq:TTEK), ultimately serving as Vice President and Chief Financial Officer of its subsidiary, Tetra Tech, EM Inc. § Current member of the Board of Trustees and Chair of the Audit Committee of Riverside Research
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Age: 62 | ​ | Skills and Qualifications | ​
​ | Senior leadership; industry & technical expertise; business development and M&A; financial sophistication; governance & risk oversight § Active CPA and member of the American Institute of Certified Public Accountants § B.S. Accounting and Business Management Purdue University § M.B.A. Northwestern University
Board Committees: Chairperson, Audit Committee; Member, Compensation Committee |
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Vice Admiral Dennis V. McGinn | Independent | Director Since 2017
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​ | Experiences § Retired as Vice Admiral of United States Navy after 35 years. Deputy Chief of Naval Operations for Warfare Requirements and Programs. Previously commanded United States Third Fleet § Assistant Secretary of the Navy for Energy, Installations, and Environment from September 2013 – January 2017 § Former President of the American Council on Renewable Energy § Past member of the Steering Committee of the Energy Future Coalition, past member of the U.S. Energy Security Council; and past member of the Bipartisan Center Energy Board § Past Co-Chairman of the CAN Military Advisory Board § Prior International Senior Fellow at the Rocky Mountain Institute § Member of the Board of Directors at Electric Power Research Institute § Member of the Board of Directors at Customer First Renewables
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Age: 77 | ​ | Skills and Qualifications | ​
​ | Senior leadership; industry & technical expertise; client regulatory; business development and M&A; talent management & compensation; governance & risk oversight; innovation & technology § B.S. Naval Engineering from the U.S. Naval Academy § Participant, National Security Program at Harvard University's Kennedy School
Board Committees: Chairperson, Compensation Committee; Member, Nominating & Corporate Governance Committee; Member, Strategy, Mergers and Acquisitions Committee |
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Wanda K. Reder | Independent | Director Since 2021
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​ | Experiences § President and Chief Executive Officer of Grid-X Partners, LLC since 2018 § Chair of the Electricity Advisory Committee of the U.S. Department of Energy, member of the Finance Committee of the National Academy of Engineering and member of the board of directors and the Strategy Committee of TechPro Power Group Inc. § Previously spent 14 years, from 2004 to 2018, at S&C Electric Company, ultimately serving as Chief Strategy Officer § Vice President of Asset Management from 2003 to 2004 and Vice President of Engineering & System Planning from 2001 to 2003 of Exelon Energy Delivery § Prior Vice President, Energy Sector of Davies Consulting, Inc.
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Age: 58 | ​ | Skills and Qualifications | ​
​ | Senior leadership; industry & technical expertise; client regulatory; business development and M&A; financial sophistication; talent management & compensation; innovation & technology § Member of the National Academy of Engineering and Fellow of the Institute of Electrical and Electronics Engineers (IEEE) § B.S. Engineering South Dakota State University § M.B.A. University of St. Thomas
Board Committees: Member, Compensation Committee; Member, Nominating & Corporate Governance Committee |
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Keith W. Renken | Independent | Director Since 2006
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​ | Experiences § Managing Partner, Renken Enterprises § Retired Senior Partner and Chairman, Executive Committee of Southern California for Deloitte and Touche in 1992 § Adjunct Professor (executive in residence) Marshall School of Business at the University of Southern California from 1992 to 2006 § Served on Board of Directors, Audit Committee and Compensation Committee of East West Bancorp, Inc. from 2000-2018 § Served on Board of Directors and Audit Committee of Limoneira Company from 2009-2015 § Served on Board of Directors and Audit Committee of Whittier Trust Company from 2006-2020
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Age: 88 | ​ | Skills and Qualifications | ​
​ | Financial sophistication; talent management & compensation; governance & risk oversight; public board § B.S. Business Administration from the University of Arizona; M.S. Business Administration from the University of Arizona
Board Committees: Member, Audit Committee |
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Mohammad Shahidehpour | Independent | Director Since 2015
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​ | Experiences § Bodine Chair Professor in the Electrical and Computer Engineering Department at IIT. Director of Robert W. Galvin Center for Electricity Innovation. University professor for over 40 years, including faculty member at IIT since 1983 and recipient of IIT's Excellence in Teaching Award § Former IIT Research Vice-President overseeing $80M in annual budget and over 200 technical projects § Principal investigator of over $60 million in grants and contracts related to electricity and modernization technological advances, mostly funded by government agencies such as the U.S. Department of Energy and U.S. Department of Defense § Founding chair of the IEEE Great Lakes Symposium on Smart Grid and the New Energy Economy § Editor-in-Chief of IEEE Transactions on Smart Grid Journal since 2009 § Elected Member of National Academy of Engineering in the U.S. § Keynote speaker in 20 International Conferences since 2007 and counseled governments on electricity and grid modernization bills globally
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Age: 67 | ​ | Skills and Qualifications | ​
​ | Senior leadership; industry & technical expertise; business development and M&A; talent management & compensation; governance & risk oversight, innovation & technology § IEEE Distinguished Lecturer; Delivered over 100 invited lectures on electricity restructuring and smart grid issues § Author of six books and 400 technical papers on electric power systems § B.S. Electrical Engineering from Iran's Sharif University of Technology; M.S. in Electrical in Engineering; Ph.D. from the University of Missouri
Board Committees: Chairperson, Nominating and Governance Committee; Member, Compensation Committee; Member, Strategy, Mergers and Acquisitions Committee |

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T HE BOARD UNANIMOUSLY RECOMMENDS A VOTE “FOR” EACH OF THE DIRECTOR NOMINEES.

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Director Compensation

The following table provides information concerning the compensation for services of our nonemployee directors during FY 2022. Dr. Brisbin is a Named Executive Officer and his compensation is presented below under “Executive Compensation” in the Summary Compensation Table and related explanatory tables. Dr. Brisbin is not entitled to additional compensation for his services as a director.

The majority of the compensation provided to nonemployee directors is delivered in equity to align director interests with those of our stockholders.

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​ | ​ | Fees Earned or | ​ | Stock | ​ | Option | ​ | All Other | ​ | ​
Name |  | Paid in Cash ($) |  | Awards (1), (2) ($) |  | Awards ($) |  | Compensation ($) |  | Totals ($)
Steven A. Cohen |  | 75,875 |  | 70,007 |  | — |  | — |  | 145,882
Cynthia A. Downes |  | 61,000 |  | 70,007 |  | — |  | — |  | 131,007
Dennis V. McGinn | ​ | 60,250 |  | 70,007 |  | — |  | — | ​ | 130,257
Wanda K. Reder |  | 52,000 |  | 70,007 |  | — |  | — | ​ | 122,007
Keith W. Renken |  | 47,750 |  | 70,007 |  | — |  | — | ​ | 117,757
Mohammad Shahidehpour |  | 61,750 |  | 70,007 |  | — |  | — | ​ | 131,757

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(1) | The amounts reported under “Stock Awards” above represent the aggregate grant date fair value of restricted stock awards granted to Non-Employee Directors during fiscal 2022 (disregarding any estimate of forfeitures related to service-based vesting conditions). For a discussion of the assumptions and methodologies used to calculate the amounts reported in this column, please see the discussion of restricted stock awards contained in Note 10 (Stockholders’ Equity) to our consolidated financial statements, included as part of our 2022 Annual Report filed on Form 10-K.

(2) | As of December 30, 2022, the following Non-Employee Directors held the following number of outstanding restricted stock awards: Messrs. Cohen, McGinn, Renken and Shahidehpour each held 3,481 shares of restricted stock, of which (i) 892 shares of restricted stock vest on June 9, 2023 and (ii) 2,589 shares of restricted stock vest in two substantially equal installments on each of June 9, 2023 and June 9, 2024. Ms. Downes held 3,324 shares of restricted stock, of which (i) 735 shares of restricted stock vest on August 4, 2023 and (ii) 2,589 shares of restricted stock vest in two substantially equal installments on each of June 9, 2023 and June 9, 2024. Ms. Reder held 3,251 shares of restricted stock, of which (i) 662 shares of restricted stock vest on December 6, 2023, and (ii) 2,589 shares of restricted stock vest in two substantially equal installments on each of June 9, 2023 and June 9, 2024.

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Annual Retainer and Meeting Fees

The following table sets forth the schedule of annual retainers and meeting fees for each Non-Employee Director in effect during FY 2022.

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Type of Fee |  | Through October 31, 2022 |  | Effective November 1, 2022 |
Annual Board Retainer | ​ | $ | 36,000 | ​ | $ | 46,000 | ​
Additional Annual Retainer to Lead Independent Director | ​ | $ | 15,000 | ​ | $ | 15,000 | ​
Additional Annual Retainer to Chair of Audit Committee | ​ | $ | 16,500 | ​ | $ | 16,500 | ​
Additional Annual Retainer to Chair of Compensation Committee | ​ | $ | 11,000 | ​ | $ | 12,000 | ​
Additional Annual Retainer to Chair of Strategy, Mergers and Acquisitions Committee | ​ | $ | 7,500 | ​ | $ | 12,000 | ​
Additional Annual Retainer to Chair of Nominating and Governance Committee | ​ | $ | 7,500 | ​ | $ | 12,000 | ​
Additional Annual Retainer to Member of Audit Committee | ​ | $ | 7,500 | ​ | $ | 6,000 | ​
Additional Annual Retainer to Member of Compensation Committee | ​ | $ | 5,500 | ​ | $ | 6,000 | ​
Additional Annual Retainer to Member of Strategy, Mergers and Acquisitions Committee | ​ | $ | 4,500 | ​ | $ | 6,000 | ​
Additional Annual Retainer to Member of Nominating and Governance Committee | ​ | $ | 4,500 | ​ | $ | 6,000 | ​
Additional Daily Fee for Attendance at Board Meetings (1) | ​ | $ | 1,500 | ​ | ​ | Discontinued | ​
Additional Daily Fee for Attendance at Committee Meetings (1) | ​ | $ | 1,000 | ​ | ​ | Discontinued | ​

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(1) | Directors only received one fee for meetings per day after a minimum of: (i) 4 Board meetings, (ii) 6 AC meetings or (iii) 5 CC, NCGC or SMAC meetings.

Compensation for Non-Employee Directors during FY 2022 generally consisted of an annual retainer, fees for attending meetings, fees for work related to board committees and a restricted stock grant award. All Non-Employee Directors are also reimbursed for out-of-pocket expenses they incur serving as directors. In addition, in conjuction with the 2022 compensation study conducted by Pearl Meyer, the Company’s independent compensation consultant, the Board increased annual retainers for non-employee directors and eliminated meeting fees, each effective November 1, 2022.

Restricted Stock Awards

In June 2022, Messrs. Cohen, McGinn, Renken, and Shahidehpour and Mss. Downes and Reder were granted a restricted stock award of 2,589 shares under the 2008 Plan. Each restricted stock award granted to our Non-Employee Directors in fiscal 2022 is subject to a two year vesting schedule, with 50% of the award vesting on each of the first and second anniversaries of the grant date, subject in each case to the Non-Employee Director’s continued service through the applicable vesting date.

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Proposal 2:

Ratification of the Appointment of Crowe as the Company’s

Independent Registered Public Accounting Firm

Crowe served as the Company’s independent registered public accountants during the fiscal year ended December 30, 2022 and, in that capacity, audited the Company’s consolidated financial statements for the fiscal year ended December 30, 2022. Although ratification by stockholders is not required by law, the Board has determined that it is desirable to request approval by the affirmative vote of a majority of the shares present or represented by proxy and entitled to vote on the proposal at the Annual Meeting of the appointment of Crowe as the Company’s independent registered public accountants for the fiscal year ending December 29, 2023. If stockholders do not ratify this appointment, the AC will reconsider whether or not to retain Crowe, and may decide to retain them notwithstanding the vote. Even if the appointment is ratified, the AC, in its discretion, may appoint a different independent registered public accounting firm at any time during the year if it determines that such a change would be in the best interests of the Company and its stockholders. A representative of Crowe will be present at the Annual Meeting, will be given the opportunity to make a statement if he or she so desires and will be available to respond to appropriate questions from stockholders.

Audit and Other Fees

Crowe

The following is a summary of the Crowe fees for professional services for the fiscal years ended December 30, 2022 and December 31, 2021.

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Fee Category |  | Crowe 2022 |  | Crowe 2021
Audit Fees | ​ | $ | 915,000 | ​ | $ | 855,000
Audit-Related Fees | ​ |  | — | ​ |  | —
Tax Fees | ​ |  | — | ​ |  | —
All Other Fees | ​ |  | — | ​ |  | —
Total Fees | ​ | $ | 915,000 | ​ | $ | 855,000

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Audit Fees. Fees for audit services provided by Crowe for fiscal 2022 and 2021 consisted of professional services for the annual audit of our consolidated financial statements and for the review of our interim condensed consolidated financial statements including quarterly reports.

The Company has been advised by Crowe that neither Crowe nor any member of Crowe has any financial interest, direct or indirect, in any capacity in the Company or its subsidiaries.

Audit Committee Pre-Approval Policy

Consistent with SEC policies regarding independence, the AC has responsibility for appointing, setting compensation and overseeing the work of the Company’s independent registered public accounting firm. In recognition of this responsibility, the AC has established a policy to pre-approve all audit and permissible non-audit services provided by the independent registered public accounting firm, including audit services, audit-related services, tax services and other services. In some cases, the full AC provides pre-approval for up to a year, related to a particular defined task or scope of work and subject to a specific budget. During the year, circumstances may arise when it becomes necessary to engage the independent registered public accounting firm for additional services not contemplated in the original pre-approval categories. In those instances, the AC requires specific pre-approval before engaging the Company’s independent registered public accounting firm. The AC may delegate pre-approval authority to one or more of its members. The member to whom such authority is delegated must report, for informational purposes only, any pre-approval decisions to the AC at its next regularly scheduled meeting.

The AC has considered whether the provision of the services described above is compatible with maintaining the Company’s independent public accounting firm’s independence and has determined that such services have not

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adversely affected Crowe’s independence. Crowe did not provide any services for fiscal 2022 and fiscal 2021 that required pre-approval by the AC.

Vote Required for Ratification of the Appointment of Crowe as the Company’s Independent Registered Public Accounting Firm

Ratification of the appointment of Crowe as the Company’s independent registered public accounting firm for the year ending December 29, 2023, requires the affirmative vote of a majority of shares present in person or represented by proxy at the Annual meeting and entitled to vote on the subject matter.

THE BOARD UNANIMOUSLY RECOMMENDS A VOTE “FOR” THE RATIFICATION OF THE APPOINTMENT OF CROWE AS THE COMPANY’S INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM FOR THE FISCAL YEAR ENDING DECEMBER 29, 2023.

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Proposal 3:

Approval, on a Non-Binding Advisory Basis, of Named

Executive Officer Compensation

In accordance with Section 14A of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), which was amended pursuant to the Dodd-Frank Wall Street Reform and Consumer Protection Act (“Dodd-Frank”), we are asking stockholders to approve a non-binding advisory resolution approving our executive compensation as reported in this Proxy Statement.

Our executive compensation decisions are made in the context of our executive compensation plan statement.

Under our executive compensation plan statement, our executive compensation philosophy is to:

| ■ | Align the interests of our executives with those of the stockholders;

| ■ | Attract, motivate, reward, and retain the top contributors upon whom, in large part, our success depends;

| ■ | Be competitive with compensation programs for companies of similar size and complexity with whom we compete for talent, including direct competitors;

| ■ | Provide compensation based upon the short-term and long-term performance of both the individual executive and the Company; and

| ■ | Strengthen the relationship between pay and performance by emphasizing variable, at-risk compensation that is dependent upon the successful achievement of specified corporate and individual goals.

We urge stockholders to read the “Executive Compensation” section beginning on page 49 of this Proxy Statement, including the “Compensation Discussion and Analysis” section, which describes in more detail our executive compensation plan statement and the key elements of our executive compensation program. The CC and the Board believe that our executive compensation program is appropriately designed to achieve the objectives of our executive compensation philosophy.

We are asking stockholders to approve the following advisory resolution at the Annual Meeting:

RESOLVED, that the stockholders of the Company approve, on a non-binding advisory basis, the compensation of the Company’s Named Executive Officers (“NEOs”) set forth under “Executive Compensation,” including the Compensation Discussion and Analysis, Summary Compensation Table and the related compensation tables and narratives in the Proxy Statement for the Annual Meeting.

This vote is an advisory vote only and will not be binding on us, our Board or the CC and will not be construed as overruling a decision by, or creating or implying any additional fiduciary duty for, the Board or the CC. However, the CC, which is responsible for designing and administering our executive compensation program, values the opinions expressed by stockholders in their vote on this proposal and will consider the outcome of the vote when making future compensation decisions for NEOs.

The Company’s current policy is to provide stockholders with an opportunity to approve, on an advisory basis, the compensation of the NEOs each year at the annual meeting of stockholders. It is expected that the next such vote will occur at the 2024 annual meeting of stockholders.

Vote Required for Approval of the Non-Binding Advisory Resolution Approving Executive Compensation

Approval of the non-binding advisory resolution approving our executive compensation requires the affirmative vote of a majority of shares present in person or represented by proxy at the Annual Meeting and entitled to vote on the subject matter.

THE BOARD UNANIMOUSLY RECOMMENDS A VOTE “FOR” THE APPROVAL, ON A NON-BINDING ADVISORY BASIS, OF THE COMPANY’S NAMED EXECUTIVE OFFICER COMPENSATION.

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Proposal 4:

Amendment to 2008 Performance Incentive Plan

General

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The Company’s long-term incentive compensation program is implemented under the Willdan Group, Inc. 2008 Performance Incentive Plan (the “2008 Plan”). The 2008 Plan emphasizes achievement of long-term performance and stockholder value creation.

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On April 17, 2023, the Company’s Board of Directors approved amending and restating the 2008 Plan, subject to approval by our stockholders. At the Annual Meeting, our stockholders will be asked to approve the following amendments set forth in the amended and restated 2008 Plan:

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| ● | Increase in Aggregate Share Limits. The 2008 Plan currently limits the aggregate number of shares of common stock that may be delivered pursuant to all awards granted under the 2008 Plan to 4,144,167 shares (plus shares subject to options granted under the Willdan Group, Inc. 2006 Stock Incentive Plan (the “2006 Plan”) which expire or are cancelled or terminated). The proposed amendments would increase this limit by an additional 750,000 shares so that the new aggregate share limit for the 2008 Plan would be 4,894,167 shares (plus shares subject to options granted under the 2006 Plan which expire or are cancelled or terminated). The proposed amendments would also increase the limit on the number of shares that may be delivered pursuant to “incentive stock options” granted under the 2008 Plan by 750,000 shares for a new limit of 5,125,000 incentive stock options. For purposes of clarity, any shares that are delivered pursuant to incentive stock options also count against (and are not in addition to) the aggregate 2008 Plan share limit described above.

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| ● | Extension of Plan Term. The 2008 Plan is currently scheduled to expire on April 17, 2032. The proposed amendments provide for the term of the 2008 Plan to be extended until April 16, 2033, the day before the tenth anniversary from the date the plan was approved by the Board.

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As of March 31, 2023, a total of 1,338,190 shares of the Company’s common stock were then subject to outstanding awards granted under the 2008 Plan, and there were then 73,074 available shares for new award grants under the 2008 Plan. The proposed amendments would increase the reserved shares under the plan by 750,000 shares. Based solely on the closing price of the Company’s common stock as reported by the Nasdaq Stock Market on March 31, 2023, the maximum aggregate market value of the additional 750,000 new shares that could be issued under the 2008 Plan is $11,715,000.

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The Company believes that incentives and stock-based awards focus employees on the objective of creating stockholder value and promoting the success of the Company, and that incentive compensation plans like the 2008 Plan are an important attraction, retention and motivation tool for participants in the plan. The Board believes that the number of shares currently available under the 2008 Plan does not give the Company sufficient authority and flexibility to adequately provide for future incentives. The Board believes that the additional shares give the Company greater flexibility to structure future incentives and better attract, retain, and award key employees.

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If stockholders do not approve this 2008 Plan proposal, the current share limits under the 2008 Plan will continue in effect and the 2008 Plan term will not be extended.

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Summary Description of the 2008 Performance Incentive Plan

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The principal terms of the 2008 Plan are summarized below. The following summary is qualified in its entirety by the full text of the 2008 Plan, which appears as Appendix A to this Proxy Statement.

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Purpose. The purpose of the 2008 Plan is to promote the success of the Company and to increase stockholder value by providing an additional means for us to attract, motivate, retain and reward selected employees and other eligible persons through the grant of awards. Equity-based awards are also intended to further align the interests of award recipients and our stockholders.

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Administration. Our Board or one or more committees appointed by our Board will administer the 2008 Plan. Our Board of Directors has delegated general administrative authority for the 2008 Plan to the Compensation Committee. A committee may delegate some or all of its authority with respect to the 2008 Plan to another committee of directors, and certain limited authority to grant awards to employees may be delegated to one or more officers of the Company. (The appropriate acting body, be it the Board of Directors, a committee within its delegated authority, or an officer within his or her delegated authority, is referred to in this proposal as the “Administrator”).

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The Administrator has broad authority under the 2008 Plan, including, without limitation, the authority:

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| ● | to select eligible participants and determine the type(s) of award(s) that they are to receive;

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| ● | to grant awards and determine the terms and conditions of awards, including the price (if any) to be paid for the shares or the award and, in the case of share-based awards, the number of shares to be offered or awarded;

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| ● | to determine any applicable vesting and exercise conditions for awards (including any applicable performance-based targets) and the extent to which such conditions have been satisfied, or determine that no delayed vesting or exercise is required (subject to the minimum vesting requirement described below), and to accelerate or extend the vesting or exercisability or extend the term of any or all outstanding awards;

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| ● | to cancel, modify, or waive the Company’s rights with respect to, or modify, discontinue, suspend, or terminate any or all outstanding awards, subject to any required consents;

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| ● | subject to the other provisions of the 2008 Plan, to make certain adjustments to an outstanding award and to authorize the conversion, succession or substitution of an award;

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| ● | to determine the method of payment of any purchase price for an award or shares of the Company’s common stock delivered under the 2008 Plan, as well as any tax-related items with respect to an award, which may be in the form of cash, check, or electronic funds transfer, by the delivery of already-owned shares of the Company’s common stock or by a reduction of the number of shares deliverable pursuant to the award, by services rendered by the recipient of the award, by notice and third party payment or cashless exercise on such terms as the Administrator may authorize, or any other form permitted by law;

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| ● | to modify the terms and conditions of any award, establish sub-plans and agreements and determine different terms and conditions that the Administrator deems necessary or advisable to comply with laws in the countries where the Company or one of its subsidiaries operates or where one or more eligible participants reside or provide services;

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| ● | to approve the form of any award agreements used under the 2008 Plan; and

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| ● | to construe and interpret the 2008 Plan, make rules for the administration of the 2008 Plan, and make all other determinations necessary or advisable for the administration of the 2008 Plan.

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No Repricing. In no case (except due to an adjustment to reflect a stock split or other event referred to under “Adjustments” below, or any repricing that may be approved by stockholders) will the Administrator (1) amend an outstanding stock option or stock appreciation right to reduce the exercise price or base price of the award, (2) cancel, exchange, or surrender an outstanding stock option or stock appreciation right in exchange for cash or other awards for

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the purpose of repricing the award, or (3) cancel, exchange, or surrender an outstanding stock option or stock appreciation right in exchange for an option or stock appreciation right with an exercise or base price that is less than the exercise or base price of the original award.

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Eligibility. Persons eligible to receive awards under the 2008 Plan include officers or employees of the Company or any of its subsidiaries, directors of the Company, and certain consultants and advisors to the Company or any of its subsidiaries. As of March 31, 2023, approximately 1,498 officers and employees of the Company and its subsidiaries (including all of the Company’s NEOs), and each of the Company’s six non-employee directors, were considered eligible under the 2008 Plan.

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Minimum Vesting Requirement. All awards granted under the 2008 Plan will be subject to a minimum vesting requirement of one year, and no portion of any award may vest earlier than the first anniversary of the grant date of the award. This minimum vesting requirement will not apply to 5% of the total number of shares available under the 2008 Plan.

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Authorized Shares; Limits on Awards. The maximum number of shares of the Company’s common stock that may be issued or transferred pursuant to awards under the 2008 Plan equals the sum of (1) 4,144,167 shares, plus (2) the number of any shares subject to stock options granted under the 2006 Plan and outstanding as of June 9, 2008 which expire, or for any reason are cancelled or terminated, after June 9, 2008 without being exercised. If stockholders approve this 2008 Plan proposal, the maximum number of shares of the Company’s common stock that may be issued or transferred pursuant to awards under the 2008 Plan will equal the sum of (1) 4,894,167 shares, plus (2) the number of any shares subject to stock options granted under the 2006 Plan and outstanding as of June 9, 2008 which expire, or for any reason are cancelled or terminated, after June 9, 2008 without being exercised.

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The following other limits are also contained in the 2008 Plan:

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| ● | The maximum number of shares that may be delivered pursuant to options qualified as incentive stock options granted under the plan is 4,375,000 shares, however if stockholders approve this 2008 Plan proposal, the maximum number of shares that may be delivered pursuant to options qualified as incentive stock options granted under the plan will be 5,125,000 shares.

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| ● | The maximum number of shares subject to those options and stock appreciation rights that are granted under the plan during any one calendar year to any one individual is 300,000 shares.

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| ● | The maximum grant date fair value for awards granted to a non-employee director under the 2008 Plan during any one calendar year is $200,000 except that this limit will be $400,000 as to (1) a non-employee director who is serving as the Independent Chair of the Board or the Lead Independent Director at the time the applicable grant is made or (2) any new non-employee director for the calendar year in which the non-employee director is first elected or appointed to the Board. For purposes of this limit, the "grant date fair value" of an award means the value of the award on the date of grant of the award determined using the equity award valuation principles applied in the Company’s financial reporting. This limit does not apply to, and will be determined without taking into account, any award granted to an individual who, on the grant date of the award, is an officer or employee of the Company or one of its subsidiaries. This limit applies on an individual basis and not on an aggregate basis to all non-employee directors as a group.

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Shares that are subject to or underlie awards which expire or for any reason are cancelled or terminated, are forfeited, fail to vest, or for any other reason are not paid or delivered under the 2008 Plan will not be counted against the share limit and will again be available for subsequent awards under the 2008 Plan. To the extent that shares are delivered pursuant to the exercise of an option or stock appreciation right granted under the 2008 Plan, the number of underlying shares as to which the exercise related will be counted against the share limit. (For purposes of clarity, if a stock appreciation right relates to 100,000 shares and is exercised at a time when the payment due to the participant is 15,000 shares, 100,000 shares shall be charged against the share limit with respect to such exercise.) Shares that are exchanged by a participant or withheld by the Company as full or partial payment in connection with any award granted

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under the 2008 Plan, as well as any shares exchanged or withheld to satisfy the tax withholding obligations related to any award, will be counted against the share limit and will not be available for subsequent awards under the 2008 Plan. To the extent that an award is settled in cash or a form other than shares, the shares that would have been delivered had there been no such cash or other settlement will not be counted against the share limit and will again be available for subsequent awards under the 2008 Plan. In the event that shares are delivered in respect of a dividend equivalent right, the actual number of shares delivered with respect to the award shall be counted against the share limit. (For purposes of clarity, if 1,000 dividend equivalent rights are granted and outstanding when the Company pays a dividend, and 50 shares are delivered in payment of those rights with respect to that dividend, 50 shares shall be counted against the share limit.) In addition, the 2008 Plan generally provides that shares issued in connection with awards that are granted by or become obligations of the Company through the assumption of awards (or in substitution for awards) in connection with an acquisition of another company will not count against the shares available for issuance under the 2008 Plan. The Company may not increase the applicable share limits of the 2008 Plan by repurchasing shares of common stock on the market (by using cash received through the exercise of stock options or otherwise).

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Types of Awards. The 2008 Plan authorizes stock options, stock appreciation rights, and other forms of awards granted or denominated in the Company’s common stock or units of the Company’s common stock, as well as cash bonus awards. The 2008 Plan retains flexibility to offer competitive incentives and to tailor benefits to specific needs and circumstances. Any award may be structured to be paid or settled in cash.

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A stock option is the right to purchase shares of the Company’s common stock at a future date at a specified price per share (the “exercise price”). The per share exercise price of an option generally may not be less than the fair market value of a share of the Company’s common stock on the date of grant. The maximum term of an option is ten years from the date of grant. An option may either be an incentive stock option or a nonqualified stock option. Incentive stock option benefits are taxed differently from nonqualified stock options, as described under “Federal Income Tax Consequences of Awards Under the 2008 Plan” below. Incentive stock options are also subject to more restrictive terms and are limited in amount by the U.S. Internal Revenue Code and the 2008 Plan. Incentive stock options may only be granted to employees of the Company or a subsidiary.

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A stock appreciation right is the right to receive payment of an amount equal to the excess of the fair market value of a share of the Company’s common stock on the date of exercise of the stock appreciation right over the base price of the stock appreciation right. The base price will be established by the Administrator at the time of grant of the stock appreciation right and generally may not be less than the fair market value of a share of the Company’s common stock on the date of grant. Stock appreciation rights may be granted in connection with other awards or independently. The maximum term of a stock appreciation right is ten years from the date of grant.

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The other types of awards that may be granted under the 2008 Plan include, without limitation, stock bonuses, restricted stock, performance stock, stock units or phantom stock (which are contractual rights to receive shares of stock, or cash based on the fair market value of a share of stock), dividend equivalents which represent the right to receive a payment based on the dividends paid on a share of stock over a stated period of time, or similar rights to purchase or acquire shares, and cash awards.

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Subject to the minimum vesting requirement described above, any awards under the 2008 Plan (including awards of stock options and stock appreciation rights) may be fully-vested at grant or may be subject to time- and/or performance-based vesting requirements.

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Dividend Equivalents; Deferrals. The Administrator may provide for the deferred payment of awards, and may determine the other terms applicable to deferrals. Subject to the following provisions, the Administrator may provide that awards under the 2008 Plan (other than options or stock appreciation rights), and/or deferrals, earn dividends or dividend equivalents based on the amount of dividends paid on outstanding shares of common stock.

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Dividends on Unvested Equity Awards. If the Company pays an ordinary cash dividend, the cash dividend will not be paid on a current basis with respect to any awards granted under the 2008 Plan that are not vested as of the record date for the ordinary cash dividend. This restriction on paying ordinary cash dividends with respect to unvested equity awards

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does not limit or restrict the administrator’s ability (1) for restricted stock or performance stock awards, to pay the ordinary cash dividend upon (and subject to) the vesting of such shares subject to these awards, (2) for stock unit awards, to credit dividend equivalents in the form of additional units that are subject to the same vesting terms as the underlying units to which the dividend equivalents relate, and (3) to make equitable adjustments to preserve the intrinsic value of awards in the event of a transaction as described below.

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Assumption and Termination of Awards. If an event occurs in which the Company does not survive (or does not survive as a public company in respect of its common stock), including, without limitation, a dissolution, merger, combination, consolidation, exchange of securities, or other reorganization, or a sale of all or substantially all of the business, stock or assets of the Company, awards then-outstanding under the 2008 Plan will not automatically become fully vested pursuant to the provisions of the 2008 Plan so long as such awards are assumed, substituted for or otherwise continued. However, if awards then-outstanding under the 2008 Plan are to be terminated in such circumstances (without being assumed or substituted for), such awards would generally become fully vested (with any performance goals applicable to the award in each case being deemed met at the “target” performance level, unless otherwise provided in the award agreement), subject to any exceptions that the Administrator may provide for in an applicable award agreement. The Administrator also has the discretion to establish other change in control provisions with respect to awards granted under the 2008 Plan. For example, the Administrator could provide for the acceleration of vesting or payment of an award in connection with a corporate event or in connection with a termination of the award holder’s employment. For the treatment of outstanding equity awards held by the NEOs in connection with a termination of employment and/or a change in control of the Company, please see the “Potential Payments Upon Change in Control and Termination” below in this Proxy Statement.

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Transfer Restrictions. Subject to certain exceptions contained in Section 5.7 of the 2008 Plan, awards under the 2008 Plan generally are not transferable by the recipient other than by will or the laws of descent and distribution and are generally exercisable, during the recipient’s lifetime, only by the recipient. Any amounts payable or shares issuable pursuant to an award generally will be paid only to the recipient or the recipient’s beneficiary or representative. The Administrator has discretion, however, to establish written conditions and procedures for the transfer of awards to other persons or entities, provided that such transfers comply with applicable federal and state securities laws and are not made for value (other than nominal consideration, settlement of marital property rights, or for interests in an entity in which more than 50% of the voting securities are held by the award recipient or by the recipient’s family members).

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Adjustments. As is customary in incentive plans of this nature, each share limit and the number and kind of shares available under the 2008 Plan and any outstanding awards, as well as the exercise or purchase prices of awards, and performance targets under certain types of performance-based awards, are subject to adjustment in the event of certain reorganizations, mergers, combinations, recapitalizations, stock splits, stock dividends, or other similar events that change the number or kind of shares outstanding, and extraordinary dividends or distributions of property to the stockholders.

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No Limit on Other Authority. The 2008 Plan does not limit the authority of the Board or any committee to grant awards or authorize any other compensation, with or without reference to the Company’s common stock, under any other plan or authority.

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Discretion to Accelerate. The minimum vesting requirement under the 2008 Plan, as described above, does not limit or restrict the Administrator’s discretion to accelerate the vesting of any award in any circumstances it determines to be appropriate.

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Limitation on Golden Parachute Payments. To the extent any award or payment under the 2008 Plan would trigger the golden parachute payment excise taxes provided for under Sections 280G and 4999 of the Code, the 2008 Plan provides that such award or payment will automatically be “cut back” to avoid triggering these excise taxes.

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Clawback Policy. Awards granted under the 2008 Plan are generally subject to the terms of any Company clawback policy in effect from time to time.

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Termination of or Changes to the 2008 Plan. The Board may amend or terminate the 2008 Plan at any time and in any manner. Stockholder approval for an amendment will be required only to the extent then required by applicable law or deemed necessary or advisable by the Board. Unless terminated earlier by the Board and subject to any extension that may be approved by stockholders, the authority to grant new awards under the 2008 Plan will terminate on April 17, 2032. If stockholders approve this 2008 Plan proposal, the term of the 2008 Plan will be extended to April 16, 2033. Outstanding awards, as well as the Administrator’s authority with respect thereto, generally will continue following the expiration or termination of the plan. Generally speaking, outstanding awards may be amended by the Administrator (except for a repricing), but the consent of the award holder is required if the amendment (or any plan amendment) materially and adversely affects the holder.

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U.S. Federal Income Tax Consequences of Awards under the 2008 Plan

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The U.S. federal income tax consequences of the 2008 Plan under current federal law, which is subject to change, are summarized in the following discussion of the general tax principles applicable to the 2008 Plan. This summary is not intended to be exhaustive and, among other considerations, does not describe the deferred compensation provisions of Section 409A of the U.S. Internal Revenue Code to the extent an award is subject to and does not satisfy those rules, nor does it describe state, local, or international tax consequences.

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With respect to nonqualified stock options, the Company is generally entitled to deduct and the participant recognizes taxable income in an amount equal to the difference between the option exercise price and the fair market value of the shares at the time of exercise, subject to any limitations under the U.S. Internal Revenue Code 162(m). With respect to incentive stock options, the company is generally not entitled to a deduction nor does the participant recognize income at the time of exercise, although the participant may be subject to the U.S. federal alternative minimum tax.

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The current federal income tax consequences of other awards authorized under the 2008 Plan generally follow certain basic patterns: nontransferable restricted stock subject to a substantial risk of forfeiture results in income recognition equal to the excess of the fair market value over the price paid (if any) only at the time the restrictions lapse (unless the recipient elects to accelerate recognition as of the date of grant); bonuses, stock appreciation rights, cash and stock-based performance awards, dividend equivalents, stock units, and other types of awards are generally subject to tax at the time of payment; and compensation otherwise effectively deferred is taxed when paid. In each of the foregoing cases, the Company will generally have a corresponding deduction at the time the participant recognizes income.

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If an award is accelerated under the 2008 Plan in connection with a “change in control” (as this term is used under the U.S. Internal Revenue Code), the Company may not be permitted to deduct the portion of the compensation attributable to the acceleration (“parachute payments”) if it exceeds certain threshold limits under the U.S. Internal Revenue Code (and certain related excise taxes may be triggered). Furthermore, the aggregate compensation in excess of $1,000,000 in any calendar year may not be permitted to be deducted by the company in certain circumstances pursuant to Section 162(m) of the U.S. Internal Revenue Code.

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Specific Benefits under the 2008 Performance Incentive Plan

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The Company has not approved any awards that are conditioned upon stockholder approval of the 2008 Plan. The Company is not currently considering any other specific award grants under the 2008 Plan. If the proposed amendments to the 2008 Plan had been in existence in fiscal 2022, the Company expects that its award grants for fiscal 2022 would not have been substantially different from those actually made in that year under the 2008 Plan. For information regarding stock-based awards granted to the Company’s NEOs during fiscal 2022, see the material under the heading “Executive Compensation” below.

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Overhang as of March 31, 2023

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The following paragraphs include additional information to help stockholders assess the potential dilutive impact of the Company’s equity awards and the 2008 Plan. As of the date hereof, the Company has outstanding awards under the 2008 Plan, the 2006 Plan, and the Company’s ESPP. There are no remaining shares available for grant under the 2006 Plan. The ESPP is intended as a qualified employee share purchase plan under Section 423 of the Code. The ESPP generally provides for broad-based participation by employees of the Company (and certain of its subsidiaries) and affords employees who elect to participate an opportunity to purchase shares of the Company’s common stock at a discount. Certain information regarding the number of shares of Company common stock available for issuance under the ESPP is included under the headings “Equity Compensation Plan Information” and “Proposal 5: Amendment to 2006 Employee Stock Purchase Plan” below. The discussion that follows in this “Potential Dilution” section does not include any shares that have been purchased under, may be purchased in the current purchase period under, or that remain available for issuance or delivery under the ESPP.

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“Overhang” refers to the number of shares of the Company’s common stock that are subject to outstanding awards or remain available for new award grants. The following table shows the total number of shares of the Company’s common stock that (i) were subject to outstanding restricted stock or unit awards granted under the 2008 Plan, (ii) were subject to outstanding stock options granted under the 2006 Plan and the 2008 Plan, including the weighted-average exercise price and remaining life of such outstanding stock options, and (iii) were then available for new award grants under the 2008 Plan as of December 30, 2022 and as of March 31, 2023. The number of shares subject to outstanding performance-based restricted stock units and the shares available for new award grants assume that all performance-based awards will pay out at the maximum performance level.

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​ ​ ​ | ​ | ​ | ​ | ​
​ |  | As of December 30, 2022 |  | As of March 31, 2023
Shares subject to outstanding restricted stock and unit awards |  | 299,155 |  | 532,419
​ | ​ | ​ | ​ | ​
Shares subject to outstanding stock options |  | 815,771 |  | 805,771
Weighted-average exercise price | ​ | $20.38 | ​ | $20.39
Weighted-average remaining life | ​ | 3.68 | ​ | 3.39
​ | ​ | ​ | ​ | ​
Shares available for new award grants |  | 391,902 |  | 73,074

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The weighted-average number of shares of the Company’s common stock issued and outstanding in each of the last three fiscal years was 11,793,000 shares issued and outstanding in 2020; 12,458,000 shares issued and outstanding in 2021; and 13,013,000 shares issued and outstanding in 2022. The number of shares of the Company’s common stock issued and outstanding as of December 30, 2022 and March 31, 2023 was 13,296,000 and 13,489,000 shares, respectively.

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As of December 30, 2022, the Company’s 815,771 outstanding stock options had a weighted-average exercise price of $20.38 and weighted-average remaining life of 3.68 years. As of March 31, 2023, the Company’s 805,771 outstanding stock options had a weighted-average exercise price of $20.39 and a weighted-average remaining life of 3.39 years.

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“Burn rate” refers to the number of shares that are subject to awards that we grant over a particular period of time. The total number of shares of the Company’s common stock subject to awards that the Company granted under the 2008 Plan in each of the last three fiscal years, and to date (as of March 31, 2023) for 2023, are as follows:

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| ● | 512,000 shares in fiscal 2020 (which was 4.3% of the weighted-average number of shares of the Company’s common stock issued and outstanding in fiscal 2020), of which 512,000 shares were subject to restricted stock;

| ● | 345,000 shares in fiscal 2021 (which was 2.8% of the weighted-average number of shares of the Company’s common stock issued and outstanding in fiscal 2021), of which 345,000 shares were subject to restricted stock;

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| ● | 290,000 shares in fiscal 2022 (which was 2.2% of the weighted-average number of shares of the Company’s common stock issued and outstanding in fiscal 2022), of which 290,000 shares were subject to restricted stock; and

| ● | 330,000 shares in fiscal 2023 through March 31, 2023 (which was 2.4% of the weighted-average number of shares of the Company’s common stock issued and outstanding on March 31, 2023), of which 330,000 shares were subject to restricted stock.

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Thus, the total number of shares of the Company’s common stock subject to awards granted under the 2008 Plan per year over the last three fiscal years (2020, 2021 and 2022) has been, on average, 3.1% of the weighted-average number of shares of the Company’s common stock issued and outstanding for the corresponding year.

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The total number of shares of our common stock that were subject to awards granted under the 2008 Plan or the 2006 Plan that terminated or expired, and thus became available for new award grants under the 2008 Plan, in each of the last three fiscal years, and to date (as of March 31, 2023) in 2023, are as follows: 18,000 in 2020, 32,000 in 2021, 71,000 in 2022, and 16,000 for 2023 (as of March 31, 2023).

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The CC anticipates that the 750,000 additional shares requested for the 2008 Plan (together with the shares available for new award grants under the 2008 Plan on the Annual Meeting date and assuming usual levels of shares becoming available for new awards as a result of forfeitures of outstanding awards) will provide the Company with flexibility to continue to grant equity awards under the 2008 Plan through approximately the end of fiscal 2025. However, this is only an estimate, in the Company’s judgment, based on current circumstances. The total number of shares that are subject to the Company’s award grants in any one year or from year-to-year may change based on a number of variables, including, without limitation, the value of the Company’s common stock (since higher stock prices generally require that fewer shares be issued to produce awards of the same grant date fair value), changes in competitors’ compensation practices or changes in compensation practices in the market generally, changes in the number of employees, changes in the number of directors and officers, whether and the extent to which vesting conditions applicable to equity-based awards are satisfied, acquisition activity and the need to grant awards to new employees in connection with acquisitions, the need to attract, retain and incentivize key talent, the type of awards the Company grants, and how the Company chooses to balance total compensation between cash and equity-based awards.

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The closing market price for a share of the Company’s common stock as of March 31, 2023 was $15.62 per share.

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Aggregate Past Grants Under the 2008 Plan

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As of March 31, 2023, awards covering 4,857,816 shares of the Company’s common stock have been granted under the 2008 Plan. (This number of shares includes shares subject to awards that expired or terminated without having been exercised and paid and became available for new award grants under the 2006 Plan and the 2008 Plan.) The following table shows information regarding the distribution of all awards among the persons and groups identified below, option exercises and restricted stock and unit vesting prior to that date, and option and unvested restricted stock holdings as of that date. The number of shares subject to past option grants includes all options that were awarded, including those that may have expired prior to exercise. The number of shares subject to outstanding performance-based restricted stock units assumes that all performance-based awards will pay out at the maximum performance level.

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​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Options and Stock Appreciation Rights | ​ | Restricted Stock / Units
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Number | ​ | ​ | ​ | Number of
​ | ​ | Number of | ​ | Number | ​ | ​ | ​ | ​ | ​ | of | ​ | ​ | ​ | Shares/Units
​ | ​ | Shares | ​ | of | ​ | Number of Shares | ​ | Shares/ | ​ | Number of | ​ | Outstanding
​ | ​ | Subject to | ​ | Shares | ​ | Underlying | ​ | Units | ​ | Shares/Units | ​ | and
​ | ​ | Past | ​ | Acquired | ​ | Options/SARs as of | ​ | Subject | ​ | Vested as of | ​ | Unvested as
​ | ​ | Option/SAR | ​ | On | ​ | March 31, 2023 | ​ | to Past | ​ | March 31, | ​ | of March 31,
Named Executive Officers: |  | Grants |  | Exercise |  | Exercisable |  | Unexercisable |  | Awards |  | 2023 | ​ | 2023
Thomas D. Brisbin, Chairman of the Board and Chief Executive Officer |  | 565,000 |  | 225,000 |  | 325,000 |  | — |  | 559,497 |  | 424,497 |  | 135,000
Michael A. Bieber, President |  | 241,667 |  | 47,236 |  | 194,431 |  | — |  | 367,669 |  | 282,169 |  | 85,500
Creighton K. Early Vice President and Chief Financial Officer | ​ | 63,333 | ​ | 22,653 | ​ | 40,680 | ​ | — | ​ | 96,505 | ​ | 58,505 | ​ | 38,000
Micah H. Chen General Counsel | ​ | 70,000 |  | — |  | 70,000 |  | — |  | 77,361 | ​ | 56,861 |  | 20,500
Paul M. Whitelaw Former Senior Vice President, Business Development | ​ | 71,587 |  | 38,500 |  | 22,337 |  | — |  | 64,082 |  | 64,082 |  | —
Total for All Current Executive Officers as a Group (5 persons): |  | 1,011,587 |  | 333,389 |  | 652,448 |  | — |  | 1,165,114 |  | 886,114 |  | 279,000
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Steven A. Cohen |  | — |  | — |  | — |  | — |  | 21,735 |  | 18,254 |  | 3,481
Cynthia A. Downes | ​ | — | ​ | — | ​ | — | ​ | — | ​ | 4,058 | ​ | 734 | ​ | 3,324
Dennis V. McGinn | ​ | — |  | — |  | — |  | — |  | 14,014 |  | 10,533 |  | 3,481
Wanda K. Reder | ​ | — | ​ | — | ​ | — | ​ | — | ​ | 3,912 | ​ | 661 | ​ | 3,251
Keith W. Renken |  | 26,000 |  | 26,000 |  | — |  | — |  | 31,735 |  | 28,254 |  | 3,481
Mohammad Shahidehpour |  | — |  | — |  | — |  | — |  | 21,735 |  | 18,254 |  | 3,481
Total for all Current Non-Executive Directors and Board Members as a Group (6 persons): |  | 26,000 |  | 26,000 |  | — |  | — |  | 97,189 |  | 76,690 |  | 20,499
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Each other person who has received 5% or more of the options, warrants or rights under the 2008 Plan |  | — |  | — |  | — |  | — |  | — |  | — |  | —
All employees, including all current officers who are not executive officers or directors, as a group |  | 1,500,200 |  | 818,899 |  | 153,323 |  | — |  | 1,057,726 |  | 803,828 |  | 253,898
Total |  | 2,537,787 |  | 1,178,288 |  | 805,771 |  | — |  | 2,320,029 |  | 1,766,632 |  | 553,397

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The non-executive directors and Dr. Brisbin are each nominees for re-election as a director at the Annual Meeting.

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Vote Required for Approval of the Amendments to the Company’s 2008 Performance Incentive Plan

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The Board believes that the adoption of the amendments to the 2008 Plan will promote the interests of the Company and its stockholders and will help the Company and its subsidiaries continue to be able to attract, retain and reward persons important to our success.

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All members of the Board and all of the Company’s executive officers are eligible for awards under the 2008 Plan and thus have a personal interest in the approval of the 2008 Plan.

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Approval of the amendments to the 2008 Plan requires the affirmative vote of a majority of shares present in person or represented by proxy at the Annual Meeting and entitled to vote on the subject matter.

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THE BOARD UNANIMOUSLY RECOMMENDS A VOTE “FOR” APPROVAL OF THE AMENDMENTS TO THE COMPANY’S 2008 PERFORMANCE INCENTIVE PLAN AS DESCRIBED ABOVE AND SET FORTH IN APPENDIX A HERETO. PROXIES RECEIVED WILL BE VOTED “FOR” APPROVAL OF AMENDMENT TO THE COMPANY’S 2008 PERFORMANCE INCENTIVE PLAN UNLESS STOCKHOLDERS SPECIFY OTHERWISE IN THEIR PROXY.

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Proposal 5:

Amendment To 2006 Employee Stock Purchase Plan

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General

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The Company maintains the Willdan Group, Inc. Amended and Restated 2006 Employee Stock Purchase Plan (the “ESPP”) to provide eligible employees with the opportunity to purchase shares of common stock at a discount. The Company utilizes the ESPP to attract employees and to incentivize employees to increase shareholder value.

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On April 17, 2023, the Company’s Board approved amending and restating the ESPP, subject to approval by our stockholders. At the Annual Meeting, our stockholders will be asked to approve the amendment to the ESPP to increase the maximum number of shares authorized for issuance under the ESPP by 800,000 shares (so that the new share limit under the ESPP would be 1,925,000 shares).

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The Board has determined that it is advisable to increase the maximum number of shares available for issuance under the ESPP in order to help retain and motivate eligible employees and further align their interests with those of our shareholders. As of March 31, 2023, there were 272,378 shares remaining available for issuance under the ESPP, and the Company had a total of 13,489,000 shares of common stock issued and outstanding. The 800,000 additional shares that may be issued under the proposed increase in the ESPP share limit, plus the 272,378 shares that remained available for issuance under the ESPP as of March 31, 2023, equal approximately 8.0% of the Company’s total issued and outstanding shares of common stock as of that date.

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In the event the shareholders fail to approve the amendment to the ESPP, the ESPP will continue in operation pursuant to its terms with no change to the number of shares authorized for issuance under the plan. In the event the shareholders fail to approve the amendment to the ESPP, the Company believes it will have to discontinue and cease all new offering periods under the ESPP as early as the offering period beginning on July 1, 2024.

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The Company believes the proposed amendment would facilitate its ability to continue to utilize the ESPP. The Company believes the ESPP is an important component of its employee compensation package and assists it in attracting and retaining skilled personnel. Of the Company’s employees eligible to participate in the ESPP, 47.7% elected to participate in the ESPP during the offering period ending December 30, 2022. The essential features of the ESPP are summarized below. The ESPP is intended to be an employee stock purchase plan within the meaning of Section 423 of the Internal Revenue Code.

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Summary Description of the 2006 Employee Stock Purchase Plan

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The principal terms of the ESPP and its operation are summarized below. The following summary is qualified in its entirety by the full text of the ESPP, which appears as Appendix B to this Proxy Statement.

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Background and Purpose. The ESPP provides eligible employees with the opportunity to purchase shares of the Company’s common stock at a discount through payroll deductions. The purposes of the ESPP are to encourage ownership of the Company’s common stock by the Company’s employees and to provide additional incentives to the Company’s employees to promote the success of the Company’s business.

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Administration. The ESPP is administered by the Board or by a committee appointed by the Board. The Compensation Committee (the “Administrator”) has authority in its discretion to interpret the ESPP, to prescribe, amend and rescind rules and regulations relating to the ESPP, and to make all other determinations necessary or advisable for the administration of the ESPP.

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Shares Available for Issuance. The aggregate number of shares of the Company’s common stock that currently may be issued pursuant to the ESPP is 1,125,000, of which 272,378 remained available for issuance as of March 31,

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2023. If shareholders approve the proposed amendment, this limit would be increased from 1,125,000 shares to 1,925,000 shares.

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Eligibility and Participation. Employees who are employed by the Company (or one of its subsidiaries designated as a “participating employer” in the ESPP) on the first day of any offering period and remain an eligible employee through the end of the offering period and who customarily work more than twenty hours per week (or such lesser number of hours as the Administrator may provide) and more than five months (or such lesser number of months as the Administrator may provide) per calendar year may participate in the ESPP. Participation in the ESPP is voluntary. No participant may purchase shares if immediately after such purchase, the participant would own stock and/or outstanding options to purchase stock comprising 5% or more of the total combined voting power of the Company’s stock or of any of the Company’s affiliates. In addition, a participant’s right to purchase stock under the ESPP may not accrue at a rate that exceeds $25,000 (determined with respect to the fair market value of the stock at the time such option to purchase shares is granted) in any calendar year in which such right is outstanding at any time.

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Currently, 1,059 employees of the Company and its subsidiaries (including all of our Named Executive Officers) were eligible to participate in the ESPP.

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Offering Periods. Shares of stock are offered for purchase on the first business day of each offering period designated by the Administrator. Currently, offering periods under the ESPP are approximately six months long and commence at the beginning of each January and July. The Administrator has the authority to change the timing and duration of the offering periods (provided that each offering period is not less than three months and is not more than 27 months in duration), and provided further that the change is announced prior to the start of the relevant offering period.

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Purchase Price. Currently, the purchase price per share of common stock covered by an option granted under the ESPP is the lesser of (i) 85% of the fair market value per share of the Company’s common stock on the first day of the applicable offering period, and (ii) 85% of the fair market value per share of the Company’s common stock on the last day of the applicable offering period. For purposes of the ESPP, the fair market value of the Company’s common stock is generally the closing price of the Company’s common stock on Nasdaq on the determination date. The Administrator may change the formula for determining the purchase price for a particular offering period prior to the start of that offering period, except that in no event may the purchase price for an offering period be lower than the lesser of (i) 85% of the fair market value per share of the Company’s common stock on the first day of the applicable offering period, and (ii) 85% of the fair market value per share of the Company’s common stock on the last day of the applicable offering period.

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Payroll Deductions. Employees participating in the ESPP for an offering period may authorize payroll deductions to the ESPP in that offering period in 1% multiples of eligible earnings for each payroll period, up to a maximum of 10% of their eligible earnings (or such different maximum as the Administrator may establish for the particular offering period). An employee generally may not change the percentage of eligible earnings withheld during an offering period, however an employee may elect to discontinue payroll deductions during an offering period effective as of the next payroll date. An employee may also withdraw from the ESPP during the offering period as described below.

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Purchase of Stock. By enrolling in the ESPP for an offering period, an employee is entitled to purchase shares of the Company’s common stock on the last day of the offering period. The maximum number of shares that may be purchased by a participating employee during an offering period is determined by dividing the amount collected from the participant through payroll deductions during the offering period by the per share purchase price in effect for that offering termination date, subject to a maximum of 10,000 shares purchasable by any one participant for any one offering period (or such different individual limit as the Administrator may establish in advance of the relevant offering period). Unless the employee’s participation is discontinued prior to such purchase date (for example, because of a termination of the employee’s employment with the Company or an election by the employee to withdraw from the ESPP), his or her purchase of the shares will occur automatically on the last day of the offering period at the applicable price.

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Withdrawal. Generally, a participant may withdraw from an offering period at any time prior to the last business day before the offering termination date by giving a withdrawal notice to the Company prior to the last payroll date in the offering period. Any such withdrawal will not affect his or her eligibility to participate in future offering periods. However, once a participant withdraws from a particular offering period, that participant may not participate again in the same offering period. Upon a participant’s withdrawal from an offering period, all of the participant’s accumulated payroll deductions held by the Company will be paid to the participant in cash without interest.

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Termination of Employment. Termination of a participant’s employment for any reason, including death, retirement, or any other voluntary or involuntary termination, cancels his or her option to purchase shares and participation in the ESPP immediately as to the offering period in which the termination of employment occurs. In such event, the payroll deductions credited to the participant’s account will be returned to him or her or, in the case of an employee’s death, to the person or persons entitled thereto as provided in the ESPP, in cash without interest.

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Restrictions on Transfer. Options under the ESPP may not be assigned, transferred, pledged, or otherwise disposed of, except by will, or under the laws of descent and distribution. An option under the ESPP may not be exercised by anyone other than the participant during the life of the participant.

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Changes in Capitalization. As is customary in incentive plans of this nature, the number of shares reserved under the ESPP, any maximum number of shares a participant may purchase in the offering period in which such event occurs, and the number of shares and the price per share in effect under each outstanding option under the ESPP shall be appropriately adjusted for the payment of a stock dividend or any increase or decrease in the number of outstanding shares of the Company’s common stock resulting from a split-up or contraction of shares without receipt of any consideration by the Company, in order to prevent the dilution or enlargement of benefits under the ESPP.

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Change of Control. In the event of a dissolution or liquidation of the Company or any other corporate transaction in which the Company does not survive or does not survive as a public company, the Administrator shall, in its sole discretion, either (a) provide for the in-progress offering period to end prior to the transaction and for shares of common stock to be purchased on the last day of the shortened offering period, or (b) arrange with the surviving, continuing, successor or purchasing corporation, as the case may be, that such corporation shall assume the Company’s rights and obligations under the ESPP.

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Amendment and Termination of the ESPP. The Board may suspend, terminate or amend the ESPP at any time and from time to time (subject to shareholder consent as may be required by applicable law). No suspension or termination of or amendment to the ESPP may materially adversely affect the rights of a participant with respect to an outstanding option held by the participant for a completed offering period as of the date of such termination or amendment without the participant’s consent.

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No Limit on Other Plans. The ESPP does not limit the ability of the Board or any committee of the Board to grant awards or authorize any other compensation, with or without reference to the Company’s common stock, under any other plan or authority.

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U.S. Federal Income Tax Consequences Under the ESPP

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The following is a brief summary of the federal income tax consequences to U.S. taxpayers and the Company with respect to the shares purchased under the ESPP. The summary is not intended to be exhaustive and, among other considerations, does not describe the deferred compensation provisions of Section 409A of the U.S. Internal Revenue Code to the extent an award is subject to and does not satisfy those rules, nor does it describe state, local, or international tax consequences.

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The ESPP, and the right of participants to make purchases thereunder, is intended to qualify under the provisions of Section 423 of the Internal Revenue Code. Under these provisions, no income will be taxable to a participant until the shares purchased under the ESPP are sold or otherwise disposed of. Upon sale or other disposition of the shares, the participant will generally be subject to tax in an amount that depends upon the holding period

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applicable to such shares. If the shares are sold or otherwise disposed of (including by gift) more than two years after the first day of the particular offering period in which such shares were acquired and more than one year after the actual purchase date of the shares, the participant will recognize ordinary income measured as the lesser of (a) the excess of the fair market value of the shares at the time of such sale or disposition over the purchase price, or (b) the excess of the fair market value of the shares as of the first day of the applicable offering period over the purchase price. Any additional gain or loss will be treated as long-term capital gain or loss. If the shares are sold or otherwise disposed of (including by gift) before the expiration of either of the aforementioned holding periods, the participant will recognize ordinary income generally measured as the excess of (a) the fair market value of the shares on the date the shares are purchased over (b) the purchase price. Any additional gain or loss on such sale or disposition will be capital gain or loss, which will be long-term if the shares are held for more than one year. The Company generally is not entitled to a deduction for amounts taxed as ordinary income or capital gain to a participant with respect to shares purchased under the ESPP except to the extent of ordinary income recognized by participants upon a sale or disposition of shares prior to the expiration of the holding periods described above.

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Participation in the ESPP

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Participation in the ESPP is voluntary and therefore the number of shares an individual employee will purchase cannot be determined in advance. If the proposed amendment to the ESPP had been in effect in 2022, the number of shares delivered under the ESPP for offering periods in 2022 would not have been different. For the six-month offering periods ending in June 2022 and December 2022, the number of shares of the Company’s common stock purchased under the ESPP were 62,937 and 91,765, respectively. However, because benefits under the ESPP may change based on any number of variables, including, without limitation, the fair market value of the Company’s common stock at various future dates, the number of our employees who elect to participate in the ESPP and the amount of payroll deductions elected by the employees who participate, it is not possible to determine the benefits that will be received by employees if the proposed ESPP amendment is approved by the shareholders.

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The closing market price for a share of the Company’s common stock as of March 31, 2023 was $15.62 per share.

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Aggregate Past Purchases Under the 2006 Employee Stock Purchase Plan

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As of March 31, 2023, a total of 852,622 shares of the Company’s common stock had been purchased by employees under the ESPP. The number of shares of common stock purchased under the ESPP by each of our Named Executive Officers and our executive officers as a group is as follows:

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​ | ​ | ​
​ |  | Number of
​ | ​ | Shares
​ | ​ | Purchase
​ | ​ | Under
Named Executive Officers: |  | ESPP
Thomas D. Brisbin |  | 6,188
Chairman of the Board and Chief Executive Officer |  | ​
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Michael A. Bieber |  | 6,203
President |  | ​
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Creighton K. Early | ​ | 6,178
Vice President and Chief Financial Officer | ​ | ​
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Micah H. Chen | ​ | 3,893
General Counsel | ​ | ​
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Paul Whitelaw | ​ | 3,631
Former Senior Vice President, Business Development | ​ | ​

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The Company’s non-employee directors are not eligible to participate in the ESPP. No person has received 5% or more of the options or rights granted under the ESPP.

Vote Required for Approval of the Amendment to ESPP

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The Board believes that the amendment to the ESPP will promote the interests of the Company and its stockholders and will assist the Company in attracting and retaining skilled personnel.

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All of the Company’s executive officers are eligible for awards under the ESPP and thus have a personal interest in the approval of the ESPP.

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Approval of the amendment to the ESPP to increase the number of shares authorized for issuance under the plan requires the affirmative vote of the majority of shares present in person or represented by proxy at the Annual Meeting and entitled to vote on the subject matter.

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THE BOARD UNANIMOUSLY RECOMMENDS A VOTE “FOR” APPROVAL OF THE AMENDMENT TO THE 2006 EMPLOYEE STOCK PURCHASE PLAN AS DESCRIBED ABOVE AND SET FORTH IN APPENDIX B HERETO. PROXIES RECEIVED WILL BE VOTED “FOR” APPROVAL OF THE AMENDMENT TO THE COMPANY’S 2006 EMPLOYEE STOCK PURCHASE PLAN UNLESS STOCKHOLDERS SPECIFY OTHERWISE IN THEIR PROXY.

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Executive Compensation

Compensation Discussion and Analysis

This CD&A and compensation tables and disclosures that follow focus primarily on compensation awarded to, earned by, or paid to our Named Executive Officers identified in the “Summary Compensation Table,” whom we refer to in this section as our “NEOs.” This section also describes the role and involvement of various parties in our executive compensation analysis and decisions, and provides a discussion of the process and rationale for the decisions of our CC to compensate our NEOs with specific types and amounts of compensation.

Chief Executive Officer Compensation Components

The following comparisons, derived from Pearl Meyer’s 2022 analysis of compensation of similarly situated executives at our peer group companies (described in the Compensation Peer Group section below), show the various elements of compensation our CEO compensation mix achieved for our CEO during fiscal 2022 compared to the average balances achieved by the peer group:

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2022 Named Executive Officers

Our NEOs include our principal executive officer during fiscal 2022, our principal financial officer during fiscal 2022, and our three other most highly compensated executive officers at the end of fiscal 2022:

​ | ​ | ​ | ​ | ​
Name |  | Age |  | Title
Thomas D. Brisbin |  | 70 |  | Chairman of the Board and Chief Executive Officer
Michael A. Bieber |  | 54 |  | President
Creighton K. Early |  | 70 |  | Vice President and Chief Financial Officer
Micah H. Chen | ​ | 51 | ​ | General Counsel
Paul M. Whitelaw(1) | ​ | 51 | ​ | Former Senior Vice President, Business Development

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| (1) | Mr. Whitelaw resigned from his position as Senior Vice President, Business Development, effective February 1, 2023.

Performance

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​ | Gross Revenue - $429.1 Million Net Income (Loss) - $(8.4) Million Adjusted EBITDA $23.3 Million Cash from Operations - $9.4 Million | ​
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Willdan continued to take actions to strengthen its position as a leading energy consulting and municipal services provider. In fiscal 2022, we delivered organic year over year revenue growth of 21%, reflecting increased demand for Willdan’s services and benefitting from increased collaboration across its complementary technical disciplines.

Willdan serves one of the most dynamic market segments in the world at one of the most exciting times. Demand for a cleaner, low carbon energy cycle is transforming the electric grid, building design and management, industrial production and transportation networks. Willdan helps its clients evaluate new technical advances and implement sustainable cost effective solutions to advance and transform the delivery and consumption of energy and other government infrastructure.

2022 Say-on-Pay Vote and Executive Compensation Program

At the 2022 Annual Meeting, approximately 57% of the votes cast approved our fiscal year end 2021 executive compensation. We value our stockholders’ opinions about our governance policies and practices and actively solicit input through our stockholder engagement program. Throughout 2022, our CEO, President, CFO, and VP of Investor Relations, proactively contacted our institutional investors to discuss and solicit their feedback on various matters including on our corporate governance and executive compensation programs. As discussed above under “Outcomes of Stockholder Engagement,” as a result of stockholder feedback received in 2022, among other things, we updated our 2022 compensation peer group and implemented a new metric for our PBRSU awards (adding Relative Total Shareholder Return). In addition to senior management, members of our Compensation Committee are available for consultation with our major shareholders. Overall, we contacted 85 investors, representing over 58% of our shares of common stock outstanding as of the end of fiscal year 2022, in addition to potential holders of our equity.

The table below provides a recap of the actions taken as well as enhancements and additional disclosures implemented in direct response to stockholder concerns over the past several years.

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equi |  |  |
--- | --- | --- | ---
Issue | Proxy Advisor and /or Stockholder Concerns | Stockholder Feedback | Actions Implemented
Clawback Policies | No clawback policy disclosed; clawback was not applicable to both cash and equity bonus compensation | Governance best practices include disclosure of policy and clawback policy that gives company ability to claw back both cash and equity | In 2020, disclosed rigorous equity clawback policy and adopted cash bonus clawback policy due to shareholder feedback
Annual Incentive Plan | Company is silent on metrics, goals and payout formula related to incentive plan and reasoning for changes to payout levels | Provide additional disclosure on the short-term compensation metrics to explain inconsistent payouts and reasoning for changes in annual payout levels | Disclosed metrics, goals, bonus pool payout formula in 2020 to provide rigor linking pay with performance
Annual Incentive Plan | No stock-holding policy for CEO | Implement a stock-holding policy for CEO | Adopted a Stock Holding Policy in 2021 that requires our CEO to hold 100% of net shares (i.e. shares remaining after payment of taxes) of our common stock acquired pursuant to the exercise of stock options or vesting of restricted stock until the earlier of twelve months following the exercise of stock options or vesting of restricted shares or the CEO’s termination of employment
Change in Control | No rigorous change in control policy disclosed | Improve change in control disclosures | Disclosed our change in control policies and practices in 2020
Stock Ownership Guidelines | No stock ownership requirements, including executive and non-employee directors | Encourage the Company to require stock ownership guidelines for executive management and non-employee directors of the Company | In 2020, the CC adopted management and non-employee director stock ownership guidelines with compliance to be within three years. Guideline includes 5x of base salary CEO; 3x base salary President; 1x base salary remaining Section 16 Officers ; and $115,000 minimum value in stock holdings for non-employee directors

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equi |  |  |
--- | --- | --- | ---
Issue | Proxy Advisor and /or Stockholder Concerns | Stockholder Feedback | Actions Implemented
Peer Group Disclosure | No compensation peer group disclosed | Enhance disclosure around compensation peer group selected for compensation and the factors considered in their selection | In 2020, disclosed our compensation peer group which has been provided every two years by a third-party consultant hired by the CC
Sustainability and Impact Reporting | No annual sustainability or impact report provided by the Company despite its core focus on providing energy savings and carbon mitigating measures | Provide sustainability metrics focused on environmental, social, and governance (“ESG”) factors | Published 2022 Sustainability Report in early 2023. See www.willdan.com under “Investors—Sustainability Report”
PBRSU Metrics | No performance metric in PBRSU program related to benchmarking peer companies | Introduce an additional metric related to Company performance in relation to peer group | In 2022, introduced a new performance metric to the PBRSU program - Relative Total Shareholder Return which benchmarks peer group performance

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Clawback Policy

The Company has a comprehensive clawback policy applicable to both short-term cash-based performance bonuses and long-term equity-based compensation. If our Company is required to prepare an accounting restatement due to our material noncompliance with any financial reporting requirements under the securities laws, then each executive officer must return to us, or forfeit if not yet paid, a specified amount. The amount is any payment received with respect to any short-term cash-based performance bonuses and any award under our 2008 Plan during the three-year period preceding the date on which our Company is required to prepare the accounting restatement based on the erroneous data less what would have been paid to the executive officer under the accounting restatement as determined by the Compensation Committee.

Stock Ownership Guidelines and Holding Policy

In 2020, the CC adopted stock ownership guidelines for executives and non-employee directors to further align the interests of executives and directors with those of stockholders. All officers and non-employee directors have three years from taking their positions to comply with these guidelines. All executive officers and directors are currently in compliance with these guidelines as of the date of this Proxy Statement.

|  |  | ​ |
Position | Unit Measure | Factor | Years to Achieve Compliance | In Compliance as of 3/10/2023
CEO | Base Salary | 5x | 3 | Yes
President | Base Salary | 3x | 3 | Yes
Section 16 Officers | Base Salary | 1x | 3 | Yes
Non-employee Directors | Minimum holding $115,000 in stock value | Not Applicable | By end of 3 years of service | Yes(1)

| (1) | Excludes Ms. Downes and Ms. Reder, who have not yet reached three years of Board service

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Our Stock Holding Policy requires our CEO to hold 100% of net shares (i.e. shares remaining after payment of taxes) of our common stock acquired pursuant to the exercise of stock options or vesting of restricted stock until the earlier of twelve months following the exercise of stock options or vesting of restricted shares or the CEO’s termination of employment.

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Management

The following table sets forth the names, ages and positions of our current executive officers, as of the date of this Proxy Statement:

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ |  | Years in |  | Years at
Name | ​ | Age | ​ | Title | ​ | Position @ | ​ | Willdan @
​ | ​ | ​ | ​ | ​ | ​ | FYE 2022 | ​ | FYE 2022
Thomas D. Brisbin |  | 70 |  | Chairman of the Board and Chief Executive Officer |  | 15 (a) |  | 15
Michael A. Bieber |  | 54 |  | President |  | 6 |  | 8
Creighton K. Early |  | 70 |  | Vice President and Chief Financial Officer |  | 2 |  | 7
Micah H. Chen |  | 51 |  | General Counsel |  | 5 |  | 6

(a) | Dr. Brisbin became CEO on 2007 and became Chairman of the Board in November 2016.

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Biographical information concerning Dr. Brisbin is set forth above under the caption “Directors”.

Michael A. Bieber was appointed as our President in November 2016. Previously, Mr. Bieber was our Senior Vice President, Corporate Development from December 2014 to November 2016. Prior to that, he served as Senior Vice President at Tetra Tech, where he served in a number of leadership roles for over 18 years. From March 2007 to December 2014, Mr. Bieber managed Tetra Tech’s mergers and acquisitions and investor relations functions, overseeing over fifty acquisitions. From 2005 to 2007, Mr. Bieber managed Tetra Tech’s corporate business development group, where he was responsible for overseeing internal business development, marketing and communications. From January 2000 to December 2014, Mr. Bieber also worked in Tetra Tech’s investor relations group. From 1996 to 2000, he was a proposal manager in Tetra Tech’s corporate marketing group. From 1994 to 1996, he served at CRC, Inc., and its successor, as a strategic business development consultant to large defense, infrastructure and environmental firms. Prior to 1994, Mr. Bieber worked for IT Corporation (now CB&I) where he served as project manager and engineer on government nuclear and commercial environmental projects. Mr. Bieber holds a B.S. degree in Civil Engineering from the Tennessee Technological University.

Creighton K. Early was appointed our Vice President and Chief Financial Officer, in April 2021. Mr. Early previously served as Executive Vice President of Willdan Energy Solutions and as Chief Financial Officer of various subsidiaries of the Company from December 2015 until his appointment to Vice President and Chief Financial Officer. Mr. Early also served as a member of the Board of Directors of H.W. Lochner, Inc., a private company, from April 2016 until H.W. Lochner, Inc. was sold in July 2021, and served as the Chairman of its audit committee from February 2021 to July 2021. Prior to joining us, Mr. Early served as Chief Financial Officer of both public and privately held companies, including three years with Infrastructure & Energy Alternatives LLC, a renewable energy construction company. He also previously spent 14 years at Earth Tech, Inc., a multinational infrastructure company, including serving as its Chief Financial Officer and as the President of its Global Water Management Division. Mr. Early holds a B.S. in Business Administration from Ohio State University and an M.B.A. from the University of Michigan.

Micah H. Chen was appointed our General Counsel in March 2018. Previously, Mr. Chen was our Legal Counsel from July 2017 to March 2018. Prior to joining us, Mr. Chen held various management positions at Aon Corporation’s Construction Services Group for nearly 10 years. From January 2016 to July 2017, Mr. Chen served as Managing Director and Senior Vice President of Aon Corporation. In this role, Mr. Chen was responsible for the group’s Account Executive practice for the West Region. From November 2008 to January 2016, Mr. Chen served as Senior Vice President of Aon Corporation. In this role, he provided risk management consultation and assisted in the evaluation and development of comprehensive risk management programs to many Top 100 Engineering-News Record clients, general contractors and multibillion-dollar commercial construction projects. Mr. Chen received his B.A. in International Economics from the University of California, Los Angeles and his J.D. from Western State University, School of Law.

Material Litigation

There are currently no ongoing material proceedings in which any director or executive officer is a party adverse to the Company or any of its subsidiaries, or in which any director or executive officer has a material interest adverse to the Company or any of its subsidiaries.

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Code of Ethics

The Company expects that all of its directors, officers and employees will maintain a high level of integrity in their dealings with and on behalf of the Company and will act in the best interests of the Company. The Company has adopted a Code of Ethical Conduct, which provides principles of conduct and ethics for the Company’s directors, officers and employees, including employees of the Company’s subsidiaries. This Code complies with the requirements of the Sarbanes-Oxley Act of 2002 and the Nasdaq Rules. This Code of Ethical Conduct is available on the Company’s website at www.willdan.com under “Investors—Corporate Governance—Governance Documents” and is also available in print, without charge, to any stockholder who requests a copy by writing to our Secretary at 2401 East Katella Avenue, Suite 300, Anaheim, California 92806. To the extent required by rules adopted by the SEC and the Nasdaq Stock Market, we intend to promptly disclose future amendments to certain provisions of the code, or waivers of such provisions granted to executive officers and directors on our website at www.willdan.com under “Investors—Corporate Governance.” In 2021, we updated our Code of Ethical Conduct whereby all employees must review and sign on an annual basis.

Executive Compensation Program Objectives and Philosophy

​ | ​ | ​
​ | ​ | ​
​ | Executive pay leveraged more to performance and long-term incentives versus peer group median Align executive’s pay with long term interests of stockholders | ​
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Our executive compensation program’s primary objective is aligning our executives’ pay with the long-term interests of our stockholders. Cash bonuses and long-term equity incentives are the elements of our executive compensation program that are “at risk”, are designed to reward performance and align with stockholders in creating long-term value. Overall, we target to reward short and long-term financial, strategic and operational performance, while facilitating the Company’s need to attract, motivate, develop and retain highly-qualified executives who are critical to our long-term success.

Our executive compensation philosophy is to:

| ■ | Align the long-term interests of our executives with those of the stockholders;

| ■ | Attract, motivate, reward, and retain the top contributors upon whom, in large part, our success depends;

| ■ | Be competitive with compensation programs for companies of similar size and complexity with whom we compete for talent, including direct competitors;

| ■ | Provide compensation based upon the short-term and long-term performance of both the individual executive and the Company; and

| ■ | Strengthen the relationship between pay and performance by emphasizing variable, at-risk compensation that is dependent upon the successful achievement of specified corporate and individual goals.

In structuring our executive compensation arrangements, our CC considers how each compensation element fits within our overall philosophy of long-term shareholder value. Our compensation program is comprised of three elements:

| ■ | Base Salary – primarily intended to attract and retain top contributors. We believe that in order to attract and retain top executives, we need to provide our executive officers with compensation levels that reward their continued service and are competitive;

| ■ | Annual Cash Bonus – the performance cash bonuses are primarily intended to motivate the NEOs to achieve our short-term performance objectives. The cash bonus pool is formula driven based on organic growth, earnings and cash flow metrics; and

| ■ | Long-Term Equity-Based Incentive Compensation – primarily intended to align our NEOs’ long-term interests with stockholders’ long-term interests.

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Our Company’s Annual Cash Bonus pool is formula driven and has historically been funded based on the product of earnings, an organic growth factor, and a days sales outstanding factor:

Bonus Pool = (25% of earnings > 6% of revenue) x (Organic Growth Factor) x (DSO Factor)

| ■ | Earnings – expressed as the Company’s operating earnings before interest, taxes, depreciation and amortization, other non-cash or non-operating expenses, and bonus.

| ■ | Organic Growth Factor –expressed as organic revenue growth year-over-year. The organic growth factor is defined as one plus/minus 2x the organic growth rate.

| o | For example, if organic revenue growth is 20%, the organic growth factor would be 1+(2 x 0.2) = 1.40. If organic revenue growth rate was negative 20%, the organic growth rate factor would be 1+(2 x -0.2) = 0.60

| ■ | Days Sales Outstanding (DSO) Factor – is calculated based on a mid-point of 70 days and is expressed as one minus the percentage lower or higher than 70 days.

| o | For example, if the DSO was 65 days, the DSO would be 1-((65-70)/70) = 1.07. If the DSO was 85 days, the DSO factor would be 1-((85-70)/70) = 0.79.

Our long-term equity-based incentive plan permits us to award various types of incentive awards, including incentive or nonqualified options, stock appreciation rights, stock bonuses, restricted stock, stock units, performance stock, phantom stock, dividend equivalents and other forms of awards. Our CC determined to move away from its historical practice of granting only time-based equity awards and introduced the performance-based restricted stock units (“PBRSUs”) in 2018 in order to further align the interests of our executives with those of stockholders by strengthening the relationship between executive pay and our performance against critical performance metrics that we believe will drive value creation for our stockholders.

Starting with fiscal 2019, nearly all of the long-term equity incentive awards granted to our NEOs were granted in the form of PBRSUs, other than to Dr. Brisbin and Mr. Chen, who were also granted time-based long-term incentive awards in fiscal 2021. In fiscal 2022, in conjuction with Pearl Meyer’s 2022 study, we adopted Pearl Meyer’s recommendation that long-term equity awards should be comprised of a combination of performance-based and time-based equity awards in order to motivate and retain our key executives.

Consistent with prior years, the performance goals, which are established for purposes of measuring performance and dictate the vesting thresholds for performance-based equity awards, were pre-established and approved by the Board prior to the beginning of the performance period – that is, the goals for the performance-based equity awards granted in fiscal 2022 were based on a previously approved business plan. These goals are fixed and are not changed over the performance period of the award.

While they are employed with us, we provide our NEOs with retirement benefits under our 401(k) Plan, participation in our medical, dental and insurance programs and vacation and other holiday pay, all in accordance with the terms of such plans and programs in effect from time to time and substantially on the same terms as those generally offered to our other employees.

We also provide, in some cases, severance benefits and automobile allowances to our executive officers, including the NEOs.

Role of the Compensation Committee

Pursuant to its charter, the CC of our Board has the authority to determine the amount of compensation given to each of the NEOs. The CC implements our executive compensation philosophy, and is responsible for administering our equity compensation plans, including approving grants of awards under the plans. In performing its duties, the CC is authorized to consider the recommendations of our CEO when determining the compensation of the other NEOs. All of the members of the CC are independent directors.

The elements of our executive compensation program were each approved by the CC. None of the NEOs is a member of the CC or, except for recommendations made by our CEO with respect to the compensation of the other NEOs, had any role in determining the compensation of the Named Executive Officers.

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The CC is authorized to retain and terminate any compensation consultant engaged to assist in the evaluation of the compensation of our senior executive officers (including all of the NEOs). In 2022, the CC hired Pearl Meyer to evaluate and compare the compensation practices for executive management and the Board. The CC was directly responsible for the appointment, compensation and oversight of Pearl Meyer and, at the time of their appointment, assessed the independence of Pearl Meyer pursuant to applicable SEC and Nasdaq Rules and concluded that no conflict of interest existed with respect to such consultant’s services to the CC. Pearl Meyer reported only to the CC and did not perform any other services for us.

Compensation Peer Group

In conjunction with their 2022 study, Pearl Meyer advised the CC regarding the construction of our customized compensation peer group provided in the table below.

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COMPENSATION PEER GROUP
§ American Superconductor Corporation § Atlas Technical Consultants, Inc. § Bowman Consulting Group Ltd. § C3.ai, Inc. § Charah Solutions, Inc. § Exponent, Inc. § FTC Solar, Inc. § ICF International, Inc. ​ | § Limbach Holdings, Inc. § Montrose Environmental Group, Inc. § NV5 Global, Inc. § Orion Energy Systems, Inc. § RCM Technologies, Inc. § Resources Connection, Inc. § Stem, Inc. ​

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The CC then compared the compensation of Willdan’s executive management with similarly situated executives of those companies and used this comparative compensation information as a reference point when setting compensation levels for 2022. In setting compensation levels for 2022, our CC also considered each executive’s level of responsibility and performance for the overall operations of the Company, historical Company practices, long-term market trends, internal pay equity, expectations regarding the individual’s future contributions, our own performance and budget considerations.

Role of Shareholder Say-on-Pay Votes

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​ | Responsive to Stockholder Concerns and Feedback | ​
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The Company annually offers stockholders the opportunity to cast an advisory vote on our executive compensation program. This annual vote is known as the “say-on-pay” proposal. At our annual general meeting in 2022, approximately 57% of votes cast were in favor of our executive compensation program in 2021. We value our stockholders' opinions about our governance policies and practices, and we actively solicit input through our stockholder engagement program that is described in detail above. As a direct result of stockholder feedback, we continued in effect several enhancements to our corporate governance and executive compensation program made in response to stockholder feedback. We welcome feedback on our corporate governance program that this active and ongoing engagement with stockholders provides.

In 2019, our stockholders included their approval of the Board and management recommendation that we solicit a say-on-pay vote on an annual basis. Our Board has adopted a policy that is consistent with that preference and, accordingly, we are holding a say-on-pay vote at this annual general meeting. A “say-on-frequency” vote is required every six years, and as such, our next say-on-frequency vote will be in 2025.

Executive Compensation Program Elements

Base Salaries

We pay each NEO a base salary to provide each executive with a minimum, fixed level of cash compensation. Decisions regarding increases to base salaries are made at the discretion of our CC. In reviewing base salary levels for our NEOs, our Compensation Committee primarily considers and assesses the following factors: the base salaries paid by our peer group companies to their similarly situated executives, each NEOs’ current base salary, their job responsibilities,

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leadership and experience, value to our Company and the recommendations of our CEO (other than with respect to his own compensation) and our President.

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Named Executive Officer |  | Base Salary at end of 2022 |  |  | Base Salary at end of 2021 | ​
Thomas D. Brisbin | ​ | $ | 505,003 | ​ | ​ | $ | 505,003 | ​
Michael A. Bieber | ​ | $ | 440,003 | ​ | ​ | $ | 440,003 | ​
Creighton K. Early | ​ | $ | 325,000 | ​ | ​ | $ | 325,000 | ​
Micah H. Chen | ​ | $ | 315,016 | ​ | ​ | $ | 315,016 | ​
Paul Whitelaw(1) | ​ | $ | 248,778 | ​ | ​ | $ | 280,010 | ​

| (1) | Mr. Whitelaw resigned from his position as Senior Vice President, Business Development, effective February 1, 2023.

2022 Annual Bonuses

We awarded performance-based cash bonuses to all of our NEO’s in 2022. The compensation bonus pool is funded based 100% on Company performance related to business metrics and the formula outlined above. The CC determined the amount of each executive’s bonus at its discretion, based on peer group comparable data, past practices and individual performance.

In determining the amount of each executive’s 2022 bonus, the CC used third-party benchmarking studies and primarily considered bonus pool size limitations, each executive’s level of responsibility and performance, contribution to the success of the business, strategic impact, retention risk, internal pay equity, and the recommendations of our CEO (other than with respect to his own compensation) in allocating the bonus pool. The CC also evaluated each executive’s individual performance during 2022 (with input from our CEO for the other NEOs).

2022 Long-Term Equity Awards

In determining the level of awards granted to each of the NEOs, our CC primarily took into account the executive’s level of responsibility and performance for the overall operations of the Company, internal pay equity, historical Company practices, each executive’s performance, and budget considerations. Furthermore, in conjuction with Pearl Meyer’s 2022 study, the Company adopted Pearl Meyer’s recommendation that long-term equity awards should be comprised of a combination of performance-based and time-based equity awards. The CC also considered the compensation paid by our peer group companies described above to similarly situated executives.

Our 2022 long-term equity design is comprised of 55% performance-based equity awards and 45% time-based equity awards. Our 2022 PBRSU design is a three-year plan where (i) 50% of each award will be earned based upon our Adjusted EBITDA performance with respect to three one-year performance periods (“Adjusted EBITDA Units”), and (ii) the remaining 50% of each award will be earned based upon our Adjusted Diluted Earnings per Share performance with respect to three one-year performance periods (“Adjusted Diluted EPS Units”), generally subject to the executive’s continued employment through the end of the three-year period (each such one-year period, a “Performance Period”, and collectively, the “Performance Periods”). The number of PBRSUs that become earned for any Performance Period under these two metrics may range from 0% to 210% of the target number of PBRSUs eligible to vest during the Performance Period, based on actual performance during the applicable Performance Periods in relation to the pre-established targets for the same Performance Period for each of the two metrics. We believe the Adjusted EBITDA and Adjusted Diluted EPS metrics are critical to measuring the performance of our business, and we believe that successful management of Adjusted EBITDA and Adjusted Diluted EPS growth will lead to the creation of long-term value for our stockholders.

At the end of the full three-year vesting period for the grant the number of PBRSUs that are earned based on the achievement of Adjusted EBITDA and Adjusted Diluted EPS in relation to the pre-established targets described below is then multiplied by a percentage ranging from 100% to 120% based on the Company’s Relative Total Shareholder Return for the three year period, which comprises the three Performance Periods, (the “Relative TSR Modifier”) to determine the number of PBRSUs that will vest. The final number of PBRSUs that become vested under this award may range from 0% to a maximum of 250% of the Adjusted EBITDA Units and the Adjusted Diluted EPS Units eligible to vest during the three Performance Periods.

As noted above, the performance goals, which are established for purposes of measuring performance and dictate the vesting thresholds for performance-based equity awards, were pre-established and approved by the Board prior to the

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beginning of the Performance Periods – that is, the goals for the performance-based equity awards granted in fiscal 2022 were based on historical performance and future growth goals. These goals are fixed and are not changed over the Performance Period of the award.

The chart below shows the Adjusted EBITDA growth rate goals that we must achieve in order to satisfy the threshold, target and maximum performance levels in the Performance Periods and the corresponding percentage of the target number of Adjusted EBITDA Units related to the Performance Periods eligible to vest. Results between the performance levels in the chart will be interpolated on a linear basis. If the threshold performance level is not achieved for the performance period, all of the Adjusted EBITDA Units will be forfeited.

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​ | ​ | Growth | Growth | Growth
​ | % of Target EBITDA | Performance | Performance | Performance
Performance | Units Earned | Period 1 | Period 2 | Period 3
Threshold | 0% | 45% | 10% | 10%
Target | 100% | 50% | 15% | 15%
Maximum | 210% | 55% | 20% | 20%

Growth rate achieved between performance levels is interpolated on a linear basis for Adjusted EBITDA Unit vesting.

For purposes of the Adjusted EBITDA Units, Adjusted EBITDA means the Company’s net income (loss) for the applicable Performance Period as determined in accordance with GAAP, plus (1) interest expense, (2) income tax expense (benefit), (3) stock-based compensation, (4) interest accretion, (5) depreciation and amortization, (6) transaction costs, (7) (gain) loss on sale of equipment, and (8) plus or minus the effect of any extraordinary item or extraordinary transaction.

The chart below shows the Adjusted Diluted EPS growth rate goals that we must achieve in order to satisfy the threshold, target and maximum performance levels for the Performance Periods, and the corresponding percentage of the target number of Adjusted Diluted EPS Units related to the Performance Periods eligible to vest. Results between the performance levels in the chart will be interpolated on a linear basis. If the threshold performance level is not achieved, all of the Adjusted Diluted EPS Units related to the Performance Period will be forfeited.

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​ | % of Target Adjusted | Growth | Growth | Growth
​ | Diluted EPS | Performance | Performance | Performance
Performance | Units Earned | Period 1 | Period 2 | Period 3
Threshold | 0% | 15% | 10% | 10%
Target | 100% | 20% | 15% | 15%
Maximum | 210% | 25% | 20% | 20%

Growth rate achieved between performance levels is interpolated on a linear basis for Adjusted Diluted EPS Unit vesting

For purposes of the Adjusted Diluted EPS Units, Adjusted Diluted EPS means the Company’s diluted earnings per share for the applicable Performance Period as determined in accordance with GAAP, before stock compensation expense, intangible amortization and interest accretion, all net of tax, plus or minus the effect of any extraordinary item or extraordinary transaction.

In 2022, the Company adopted the recommendation of its compensation consultant, Pearl Meyer, and introduced a time-based equity award into the long-term equity compensation program. In light of the dynamic business environment and related financial performance that resulted from the Covid-19 pandemic, the CC opted to implement, for 2022 only, this time-based equity award as a one-year time-based award. The CC has indicated that starting in 2023, it will not issue another one-year time-based equity award and will be implementing three-year time-based equity awards to align with the PBRSU three-year performance periods.

During the first quarter of fiscal 2023, the CC awarded the 2023 long-term equity awards, and the PBRSUs and time-based equity awards are both scheduled to vest over three-year periods.

Rigorous Change in Control Definition

For purposes of long-term equity incentive and PBRSUs, a “Change in Control” of the Company shall be deemed to have occurred if a consummation of any of the following events occurs:

(i) | Any “person” or “group” (within the meaning of Sections 13(d) and 14(d)(2) of the Exchange Act), other than a trustee or other fiduciary holding securities under an employee benefit plan of the Company (an “Acquiring

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| Person”), is or becomes the “beneficial owner” (as defined in Rule 13d-3 under the Exchange Act), directly or indirectly, of more than 33 1/3% of the then outstanding voting stock of the Company;

(ii) | Consummation of a merger or consolidation of the Company with any other corporation, other than a merger or consolidation which would result in the voting securities of the Company outstanding immediately prior thereto continuing to represent (either by remaining outstanding or by being converted into voting securities of the surviving entity) at least 51% of the combined voting power of the voting securities of the Company or surviving entity outstanding immediately after such merger or consolidation;

(iii) | Consummation of a sale or other disposition by the Company of all or substantially all of the Company’s assets;

(iv) | During any period of two consecutive years (beginning on or after the date of grant), individuals who at the beginning of such period constitute the Board and any new director (other than a director who is a representative or nominee of an Acquiring Person) whose election by the Board or nomination for election by the Company’s stockholders was approved by a vote of at least a majority of the directors then still in office who either were directors at the beginning of the period or whose election or nomination was previously so approved, no longer constitute a majority of the Board; provided, however, in no event shall any acquisition of securities, a change in the composition of the Board or a merger or other consolidation pursuant to a plan of reorganization under chapter 11 of the Bankruptcy Code with respect to the Company, or a liquidation under the Bankruptcy Code, constitute a Change in Control. In addition, a Change in Control shall not be deemed to have occurred in the event of a sale or conveyance in which the Company continues as a holding company of an entity or entities that conduct the business or businesses formerly conducted by the Company, or any transaction undertaken for the purpose of reincorporating the Company under the laws of another jurisdiction, if such transaction does not materially affect the beneficial ownership of the Company’s capital stock.

Potential Vesting Upon Change in Control

If a Change in Control occurs after the date of grant and prior to the end of any Performance Period, on the date of the consummation of such Change in Control, the number of PBRSUs that shall be eligible to vest (the “Contingently Vested Units”) shall be calculated as follows: (i) with respect to the pending Performance Period in-progress at the time of the Change in Control, the greater of (with the Adjusted Diluted EPS Units, and Adjusted EBITDA Units being evaluated separately and not in the aggregate) (A) the target number of Adjusted Diluted EPS Units or Adjusted EBITDA Units associated with such Performance Period and (B) the number of Adjusted Diluted EPS Units or Adjusted EBITDA Units that become earned based on actual performance (assuming the last day of such performance period is the date of the consummation of such Change in Control, with the CC to make such appropriate pro-rating adjustments to the performance metrics as shall be necessary to reflect the shortened Performance Period), plus (ii) with respect to any Performance Period(s) remaining that have not commenced, the greater of (with the Adjusted Diluted EPS Units and Adjusted EBITDA Units being evaluated separately and not in the aggregate) (X) the target number of Adjusted Diluted EPS Units or Adjusted EBITDA Units associated with such Performance Period(s) and (Y) the average number (measured as a percentage of target) of Adjusted Diluted EPS Units, or Adjusted EBITDA Units that have become earned based on actual performance for all Performance Periods that have been completed (and are not in-progress) as of the date of the Change in Control. Any PBRSUs that are not Contingently Vested Units as of the date of the consummation of such Change in Control shall automatically terminate without consideration as of such date.

The Contingently Vested Units shall become earned and vested on the first anniversary date of the consummation of such Change in Control, subject to the employee’s continued employment or service with us (or any successor) through such date; provided, however, that if the employee’s employment or service is terminated (i) by us (or any successor) without “cause”, (ii) by the employee for “good reason”, or (iii) due to the employee’s death or “disability”, in each case, prior to such first anniversary of the Change in Control, the Contingently Vested Units shall become earned and vested on such termination date. Any Contingently Vested Units that do not vest pursuant to the preceding sentence shall automatically terminate without consideration on such termination date.

Severance

Dr. Brisbin is employed pursuant to an employment agreement that provides specified levels of severance benefits if his employment is terminated by us without “cause” or by Dr. Brisbin for a “good reason.” The level of Dr. Brisbin’s severance benefit was negotiated and established in connection with Dr. Brisbin’s entry into his employment agreement

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and has been determined to be appropriate by the CC based on Dr. Brisbin’s level of responsibility and performance for the overall operations of the Company, long-term market trends, and budget considerations. Severance benefits for Dr. Brisbin are based on a multiple of “2x” his base salary. Severance benefits for Dr. Brisbin also include payment of Dr. Brisbin’s target bonus for the year of termination of employment.

The Company has not entered into an employment agreement or offer letter that provides for the payment of severance benefits for any type of termination of employment with Mr. Bieber, Mr. Early, or Mr. Chen.

We entered into a separation agreement with Mr. Whitelaw in connection with his resignation, effective February 1, 2023 (the “Separation Agreement”). Pursuant to the Separation Agreement, in consideration of Mr. Whitelaw’s release of claims in favor of the Company, the Company will provide Mr. Whitelaw the following benefits: (i) $233,342 (subject to tax withholding and other authorized deductions), payable over ten (10) months in equal installments in accordance with the Company’s standard payroll processes; (ii) acceleration of the vesting of Mr. Whitelaw’s outstanding restricted stock and outstanding performance-based restricted stock units at target levels, such that all of Mr. Whitelaw’s outstanding and unvested restricted stock and performance-based restricted stock units will be fully vested as of February 1, 2023; and (iii) extension of the exercise period for Mr. Whitelaw’s vested options through December 31, 2023. We believe it appropriate to have entered into the above separation agreement in connection Mr. Whitelaw’s voluntary resignation given his years of service to the Company and the release of claims in favor of the Company.

None of our NEOs are entitled to receive any automatic “single trigger” equity acceleration, as our equity awards will only vest in connection with a change in control of the Company if they are not substituted or assumed in connection with the transaction. Please see the introductory section above for the definition of a change in control that applies to our equity awards, which we believe is a rigorous change in control definition. The treatment of PBRSUs in a change in control is also described above.

No Named Executive Officer is entitled to receive a “gross-up” or similar payment for any excise taxes that may become payable in connection with a change in control pursuant to Sections 280G and 4999 of the Code. Instead, our 2008 Plan generally provides that awards or payments under the 2008 Plan are automatically “cut back” in such circumstances in order to avoid triggering these excise taxes.

Policy with Respect to Section 162(m)

Section 162(m) of the Code generally prohibits a publicly-held company from deducting compensation paid to a current or former Named Executive Officer that exceeds $1.0 million during the tax year. Certain awards granted before November 2, 2017 that were based upon attaining pre-established performance measures that were set by the CC under a plan approved by our stockholders, as well as amounts payable to former executives pursuant to a written binding contract that was in effect on November 2, 2017, may qualify for an exception to the $1.0 million deductibility limit.

As one of the factors in its consideration of compensation matters, our CC notes this deductibility limitation. However, our CC has the flexibility to take any compensation-related actions that it determines are in the best interests of the Company and our stockholders, including awarding compensation that may not be deductible for tax purposes. There can be no assurance that any compensation will in fact be deductible as a result of the limitations under Section 162(m).

Compensation Committee Interlocks and Insider Participation

The Board’s CC consists of Mss. Downes and Reder, and Messrs. McGinn and Shahidehpour. None of the members of our CC has at any time been one of our officers or employees, nor has any member of our CC had any relationship requiring disclosure under Item 404 of Regulation S-K. None of our executive officers serves, or in the past year has served, as a member of the board of directors or the CC of any entity that has one or more executive officers who serve on our Board or CC.

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Compensation Committee Report

The CC of the Board has reviewed and discussed with management the disclosures contained in the CD&A section of this Proxy Statement. Based upon this review and discussion, the CC recommended to the Board that the CD&A section be included in this Proxy Statement.

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​ | Compensation Committee of the Board
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​ | Dennis V. McGinn (Chair)
​ | Cynthia A. Downes Wanda K. Reder Mohammad Shahidehpour ​

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The foregoing Report of the Compensation Committee does not constitute soliciting material and shall not be deemed filed, incorporated by reference into or a part of any other filing by the Company (including any future filings) under the Securities Act of 1933, as amended, or the Exchange Act, except to the extent the Company specifically incorporates such report by reference therein.

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Compensation of Named Executive Officers

Summary Compensation Table – Fiscal 2022, Fiscal 2021, and Fiscal 2020

The following table presents information regarding compensation during FY 2022, 2021, and FY 2020 of our NEOs.

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​ |  | ​ |  | ​ |  | ​ |  | Stock |  | Option |  | All Other |  | ​
Name and | ​ | ​ | ​ | Salary | ​ | Bonus | ​ | Awards | ​ | Awards | ​ | Compensation | ​ | Total
Principal Position |  | Year |  | ($) |  | ($)(1) |  | ($)(2) |  | ($)(3) |  | ($)(4) |  | ($)
Thomas D. Brisbin(5) |  | 2022 | ​ | 505,003 | ​ | 575,000 | ​ | 992,230 | ​ | — | ​ | 13,800 | ​ | 2,086,033
Chairman of the Board |  | 2021 | ​ | 505,003 | ​ | 230,000 | ​ | 2,242,045 | ​ | — | ​ | 13,800 | ​ | 2,990,848
and Chief Executive Officer |  | 2020 | ​ | 418,933 | ​ | 575,000 | ​ | 1,183,022 | ​ | — | ​ | 14,008 | ​ | 2,190,963
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Michael A. Bieber |  | 2022 | ​ | 440,003 | ​ | 475,000 | ​ | 916,575 | ​ | — | ​ | 3,750 | ​ | 1,835,328
President |  | 2021 | ​ | 440,003 | ​ | 190,000 | ​ | 852,005 | ​ | — | ​ | 3,750 | ​ | 1,485,758
​ |  | 2020 | ​ | 364,913 | ​ | 475,000 | ​ | 899,093 | ​ | — | ​ | 3,750 | ​ | 1,742,756
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Creighton K. Early | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Vice President and | ​ | 2022 | ​ | 325,000 | ​ | 100,000 | ​ | 192,956 | ​ | — | ​ | 4,250 | ​ | 622,206
Chief Financial Officer | ​ | 2021 | ​ | 325,000 | ​ | 28,000 | ​ | 269,040 | ​ | — | ​ | 4,250 | ​ | 626,290
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Micah H. Chen | ​ | 2022 | ​ | 315,016 | ​ | 90,000 | ​ | 192,956 | ​ | — | ​ | 4,750 | ​ | 602,722
General Counsel | ​ | 2021 | ​ | 315,016 | ​ | 30,000 | ​ | 346,340 | ​ | — | ​ | 4,750 | ​ | 696,106
​ | ​ | 2020 | ​ | 282,738 | ​ | 75,000 | ​ | 165,633 | ​ | — | ​ | 11,196 | ​ | 534,567
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Paul Whitelaw(6) | ​ | 2022 | ​ | 248,778 | ​ | 75,000 | ​ | 192,656 | ​ | — | ​ | 4,615 | ​ | 521,049
Former Senior Vice President, | ​ | 2021 | ​ | 280,010 | ​ | 170,000 | ​ | 246,620 | ​ | — | ​ | 4,750 | ​ | 701,380
Business Development | ​ | 2020 | ​ | 252,433 | ​ | 75,000 | ​ | 165,633 | ​ | — | ​ | 4,750 | ​ | 497,816

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(1) | The amounts reported under “Bonus” for fiscal 2022, 2021, and 2020 represent bonuses paid for performance related to fiscal 2021, 2020, and 2019, respectively.

(2) | The amounts reported under “Stock Awards” for fiscal 2022, 2021, and 2020 represent the aggregate grant date fair value of time based and performance based restricted stock units granted to NEOs during fiscal 2022, 2021, and 2020 (disregarding any estimate of forfeitures related to service-based vesting conditions). For a discussion of the assumptions and methodologies used to calculate the amounts reported in this column, please see the discussion of restricted stock awards and performance-based restricted stock units contained in Note 10 (Stockholders’ Equity) to our consolidated financial statements, included as part of our 2022 Annual Report filed on Form 10-K. For 2022, the Adjusted Diluted EPS Units, Adjusted EBITDA Units and Relative TSR are valued based on the probable outcome of the applicable performance conditions as determined on the grant date. If we achieved the highest level of performance under the Adjusted Diluted EPS Units, Adjusted EBITDA Units and Relative TSR, the total grant date fair value for the Adjusted Diluted EPS Units, Adjusted EBITDA Units and Relative TSR would increase the PBRSUs to the following amounts: Dr. Brisbin $1,361,615; Mr. Bieber $822,566; Mr. Early $173,166, Mr. Chen $173,166, and Mr. Whitelaw $173,166.

(3) | The amounts reported under “Option Awards” represent the aggregate grant date fair value of option awards granted to our NEOs (disregarding any estimate of forfeitures related to service-based vesting conditions). For a discussion of the assumptions and methodologies used to calculate the amounts reported in this column, please see the discussion of stock option awards contained in Note 10 (Stockholders’ Equity) to our consolidated financial statements, included as part of our 2022 Annual Report filed on Form 10-K.

(4) | The amounts reported under “All Other Compensation” for each of fiscal 2022, 2021 and 2020 include $3,000 in 401(k) matching contributions made by us for each of our NEOs and, only for Dr. Brisbin, automobile allowances paid to him or use of a company vehicle. The remaining balance of the amounts under “All Other Compensation” for Mr. Bieber, Mr. Early, Mr. Chen, and Mr. Whitelaw for 2021 represents Health Saving Account contributions. The remaining balance of the amounts under “All Other Compensation” for Mr. Chen for 2020 represents cashing out of accumulated paid-time-off.

(5) | Dr. Brisbin served on the Board during each of fiscal 2022, 2021, and 2020. As an employee-director, Dr. Brisbin did not receive additional compensation for his services as a director.

(6) | Mr. Whitelaw resigned from his position as Senior Vice President, Business development, effective February 1, 2023.

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Compensation of Named Executive Officers

The Summary Compensation Table above quantifies the value of the different forms of compensation earned by or awarded to our NEOs in each applicable fiscal year. As described in the “Compensation Discussion and Analysis” section above, the primary elements of each Named Executive Officer’s total compensation reported in the table for 2022 are base salary, performance bonus and a long-term equity incentive awards. NEOs also received the other benefits listed in the “All Other Compensation” column of the Summary Compensation Table, as further described in the footnotes above.

The Summary Compensation Table should be read in conjunction with the “Compensation Discussion and Analysis” section above and the tables and narrative descriptions that follow. A description of the material terms of each Named Executive Officer’s employment agreement, if any, is provided immediately following this paragraph.

Description of Employment Agreements, Salary and Bonus Amounts

On May 3, 2011, we entered into an amended and restated employment agreement with Dr. Brisbin. This employment agreement provides for “at-will” employment and does not include a specified term. This agreement provides for Dr. Brisbin to receive a base salary and an annual incentive bonus as determined by the CC. The annual target bonus for Dr. Brisbin under this agreement is 100% of his annual base salary. Dr. Brisbin is also entitled to participate in benefit plans made available to our employees generally.

On December 17, 2014, we entered into an offer letter with Mr. Bieber. The letter provides that Mr. Bieber’s employment is on an “at-will” basis and for his initial base salary to be $270,000 per year (which has been subsequently increased to approximately $440,003 per year).

The Company has not entered into an employment agreement or offer letter with Mr. Early, Mr. Chen, or Mr. Whitelaw. The Company entered into a separation agreement with Mr. Whitelaw upon his resignation, as described above under “Severance”.

The provisions of these agreements relating to severance benefits following a termination of the Named Executive Officer’s employment are described below under “Potential Payments Upon Termination or Change in Control

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Grants of Plan-Based Awards in Fiscal 202 2

The following table provides additional information regarding the equity incentive awards granted to NEOs during fiscal 2022 under the 2008 Plan. See the “Compensation Discussion and Analysis” section above for a description of the material terms of the awards.

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Estimated Future Payouts Under Equity | ​ | All Other Stock | ​ | ​
​ | ​ | ​ | ​ | Incentive Plan Awards | ​ | Awards | ​ | Grant Date Fair Value
​ | ​ | ​ | ​ | ​ | ​ | Number of Shares | ​ | of Options Awards
​ | ​ | Grant | ​ | Threshold | ​ | Target | ​ | Maximum | ​ | of Stock or Units | ​ | and Stock Awards
Name |  | Date |  | (#) | ​ | (#) |  | (#) |  | (#) |  | ($)
Thomas D. Brisbin | ​ | 3/8/2022 | ​ | ​ | ​ | — | ​ | — | ​ | 13,751 | (1)​ | 447,595
​ | ​ | 8/2/2022 | ​ | 1 | ​ | 19,500 | (2)​ | 48,751 | ​ | — | ​ | 544,635
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Michael A. Bieber | ​ | 3/8/2022 | ​ | ​ | ​ | — | ​ | — | ​ | 18,051 | (1)​ | 587,560
​ | ​ | 8/2/2022 | ​ | 1 | ​ | 11,780 | (2)​ | 29,450 | ​ | — | ​ | 329,015
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Creighton K. Early | ​ | 3/8/2022 | ​ | ​ | ​ | — | ​ | — | ​ | 3,800 | (1)​ | 123,690
​ | ​ | 8/2/2022 | ​ | 1 | ​ | 2,480 | (2)​ | 6,200 | ​ | — | ​ | 69,266
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Micah H. Chen | ​ | 3/8/2022 | ​ | ​ | ​ | — | ​ | — | ​ | 3,800 | (1)​ | 123,690
​ | ​ | 8/2/2022 | ​ | 1 | ​ | 2,480 | (2)​ | 6,200 | ​ | — | ​ | 69,266
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Paul M. Whitelaw(3) | ​ | 3/8/2022 | ​ | ​ | ​ | — | ​ | — | ​ | 3,800 | (1)​ | 123,690
​ | ​ | 8/2/2022 | ​ | 1 | ​ | 2,480 | (2)​ | 6,200 | ​ | — | ​ | 69,266

(1) | Represents shares of restricted stock awarded on March 8, 2022, which vested in one installment on March 8, 2023, and have a mandatory one-year post-vesting holding period.

(2) | These stock awards vest in annual installments over three years from their grant date based on performance metrics. Performance metrics consist of 50% of the target number of Adjusted Diluted EPS Units and 50% of the target number of Adjusted EBITDA Units. These two metrics may range from 0% to 210% of the target number of PBRSUs eligible to vest. At the end of the three year vesting period, the PBRSUs that are earned and vested based on the achievement of Adjusted Diluted EPS Units and Adjusted EBITDA Units are then multiplied by a percentage ranging from 100% to 120% based on the Company’s Relative TSR to the Company’s customized peer group. Total combined maximum vesting may not exceed 250% of target award.

(3) | Mr. Whitelaw resigned from his position as Senior Vice President, Business Development, effective February 1, 2023.

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Outstanding Equity Awards at Fiscal 2022 Year-End

The following table provides information regarding the outstanding option and restricted stock or unit awards held by each NEO as of December 30, 2022.

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Options Awards | ​ | Stock Awards
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Equity | ​ | Equity
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Incentive | ​ | Incentive
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Plan Awards: | ​ | Plan Awards:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Market or
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Number of | ​ | Payout Value
​ | ​ | Numbers of | ​ | Number of | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Unearned | ​ | of Unearned
​ | ​ | Securities | ​ | Securities | ​ | ​ | ​ | ​ | ​ | Number of | ​ | Market Value | ​ | Shares, Units | ​ | Shares, Units
​ | ​ | Underlying | ​ | Underlying | ​ | ​ | ​ | ​ | ​ | Shares or Units | ​ | of Shares or | ​ | or Other | ​ | or Other
​ | ​ | Unexercised | ​ | Unexercised | ​ | Option | ​ | ​ | ​ | of Stock that | ​ | Units of Stock | ​ | Rights That | ​ | Rights That
​ | ​ | Options | ​ | Options | ​ | Exercise | ​ | Option | ​ | Have Not | ​ | That Have Not | ​ | Have Not | ​ | Have Not
​ | ​ | Exercisable | ​ | Unexercisable | ​ | Price | ​ | Expiration | ​ | Vested | ​ | Vested | ​ | Vested | ​ | Vested
Name |  | (#) |  | (#) |  | ($) |  | Date |  | (#) | ​ | ($) |  | (#) | ​ | ($)
Thomas D. Brisbin |  | 50,000 | ​ | — | ​ | 7.13 | ​ | 6/6/2024 | ​ | — | ​ | — | ​ | 48,751 | (2)​ | 1,361,615
​ |  | 50,000 | ​ | — | ​ | 13.91 | ​ | 6/5/2025 | ​ | — | ​ | — | ​ | — | ​ | —
​ |  | 100,000 | ​ | — | ​ | 16.27 | ​ | 11/3/2026 | ​ | 18,750 | (1)​ | 840,750 | ​ | — | ​ | —
​ |  | 125,000 | ​ | — | ​ | 31.73 | ​ | 9/4/2028 | ​ | 13,751 | (3)​ | 447,595 | ​ | — | ​ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Michael A. Bieber | ​ | 77,764 | ​ | — | ​ | 13.49 | ​ | 12/31/2024 | ​ | — | ​ | — | ​ | 29,451 | (2)​ | 822,566
​ |  | 25,000 | ​ | — | ​ | 13.91 | ​ | 6/5/2025 | ​ | — | ​ | — | ​ | — | ​ | —
​ | ​ | 50,000 | ​ | — | ​ | 16.27 | ​ | 11/3/2026 | ​ | — | ​ | — | ​ | — | ​ | —
​ | ​ | 16,667 | ​ | — | ​ | 28.19 | ​ | 3/8/2027 | ​ | — | ​ | — | ​ | — | ​ | —
​ | ​ | 25,000 | ​ | — | ​ | 31.73 | ​ | 9/4/2028 | ​ | 18,051 | (3)​ | 587,560 | ​ | — | ​ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Creighton K. Early | ​ | 27,347 | ​ | — | ​ | 9.08 | ​ | 12/7/2025 | ​ | — | ​ | — | ​ | 6,200 | (2)​ | 173,166
​ | ​ | 13,333 | ​ | — | ​ | 30.06 | ​ | 10/31/2027 | ​ | — | ​ | — | ​ | — | ​ | —
​ | ​ | — | ​ | — | ​ | — | ​ | — | ​ | 3,800 | (3)​ | 123,690 | ​ | — | ​ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Micah H. Chen | ​ | 70,000 | ​ | — | ​ | 32.79 | ​ | 7/17/2027 | ​ | — | ​ | — | ​ | 6,200 | (2)​ | 173,166
​ | ​ | — | ​ | — | ​ | — | ​ | — | ​ | 2,500 | (4)​ | 94,700 | ​ | — | ​ | —
​ | ​ | — | ​ | — | ​ | — | ​ | — | ​ | 3,800 | (3)​ | 123,690 | ​ | — | ​ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Paul M. Whitelaw(5) | ​ | 9,000 | ​ | — | ​ | 16.09 | ​ | 11/2/2026 | ​ | — | ​ | — | ​ | 6,200 | (2)​ | 173,166
​ | ​ | 6,670 | ​ | — | ​ | 28.19 | ​ | 3/8/2027 | ​ | — | ​ | — | ​ | — | ​ | —
​ | ​ | 6,667 | ​ | — | ​ | 30.06 | ​ | 10/31/2027 | ​ | 3,800 | (3)​ | 123,690 | ​ | — | ​ | —

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(1) | These restricted stock awards were granted on March 9, 2021 and vest in substantially equal annual installments over four years from their grant date.

(2) | These performance based restricted stock units were granted on August 2, 2022 and vest in substantially equal installments over three years from their grant date.

(3) | These restricted stock awards were granted on March 8, 2022 and vest in one year from their grant date with a one-year post-vest mandatory holding period.

(4) | These restricted stock awards were granted on May 4, 2021 and vest in substantially equal annual installments over two years from their grant date.

(5) | Mr. Whitelaw’s then-outstanding equity awards were vested upon his resignation from his position as Senior Vice President, Business Development, effective February 1, 2023.

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Option Exercises and Stock Vested in Fiscal 202 2

The following table provides information regarding the options exercised by each NEO and stock awards vested during fiscal 2022.

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Option Awards | ​ | Stock Awards
​ | ​ | Numbers of | ​ | ​ | ​ | Numbers of | ​ | ​
​ | ​ | Shares Acquired | ​ | Value Realized | ​ | Shares Acquired | ​ | Value Realized
Name | ​ | on Exercise | ​ | on Exercise | ​ | on Vesting | ​ | on Vesting
​ |  | (#) |  | ($) (1) |  | (#) |  | ($) (2)
Thomas D. Brisbin | ​ | — | ​ | — | ​ | 81,599 | ​ | 2,541,192
Michael A. Bieber | ​ | 25,000 | ​ | 468,870 | ​ | 56,517 | ​ | 1,751,243
Creighton K. Early | ​ | — | ​ | — | ​ | 17,787 | ​ | 518,999
Micah H. Chen | ​ | — | ​ | — | ​ | 13,077 | ​ | 401,666
Paul M. Whitelaw(3) | ​ | — | ​ | — | ​ | 15,152 | ​ | 469,678

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(1) | The amounts reported as the “Value Realized on Exercise” (if any) are determined by multiplying (i) the number of shares of common stock to which the exercise of the option related by (ii) the difference between the per-share price of the common stock on the exercise date and exercise price of the options.

(2) | The amounts reported as the “Value Realized on Vesting” (if any) are determined by multiplying (i) the number of shares of common stock that vested by (ii) the per-share price of the common stock on the vesting date.

(3) | Mr. Whitelaw resigned from his position as Senior Vice President, Business Development, effective February 1, 2023.

Potential Payments Upon Termination or Change in Control

Outstanding options and restricted stock and unit awards issued under our 2008 Plan will vest immediately and become fully exercisable upon a change in control of us to the extent such outstanding awards are not substituted or assumed in connection with the transaction.

In addition, the terms of the Adjusted EBITDA Units and Adjusted Diluted EPS Units provide that in the event a change in control occurs before the end of any Performance Period, the greater of the target number of each type of units subject to the award or the number of each type of units earned based on actual performance through the date of the change in control will become eligible to vest (with the number of units earned based on actual performance for Performance Period yet to begin measured on an average basis based on actual performance in all completed Performance Period). Any Adjusted EBITDA Units and Adjusted Diluted EPS Units that become eligible to vest will vest on the first anniversary of the date of the change in control, or earlier upon a Named Executive Officer’s termination of employment by the Company without cause, by the executive for a “good reason,” or due to an executive’s death or disability. Upon a Named Executive Officer’s death or disability at any time (whether or not in connection with a change in control), the executive will become vested in the greater of the target number of each type of units subject to the award or the number of each type of units earned based on actual performance for the then in-progress Performance Period, and in the target number of each type of units for all Performance Period that have yet to begin.

The employment agreement entered into with Dr. Brisbin provides for severance benefits upon certain terminations of his employment with us. If such Named Executive Officer’s employment is terminated by us without cause or by the Named Executive Officer for good reason (as such terms are defined in his employment agreement), the Named Executive Officer will be entitled to a severance benefit equal to two times his base salary at the annualized rate then in effect, paid in 24 equal installments. In addition, the Named Executive Officer would be entitled to payment of his target bonus for the year in which such a termination of employment occurs. The Named Executive Officer’s right to receive the severance benefits described above is contingent on the executive providing a general release of claims in favor of the Company and complying with certain non-solicitation and other restrictive covenants set forth in his employment agreement.

Mr. Bieber’s offer letter does not provide for any additional severance benefits. As noted above, we have not entered into an employment agreement or offer letter that provides for the payment of severance benefits for any type of termination of employment with Mr. Bieber, Mr. Early, Mr. Chen, or Mr. Whitelaw. The Company did enter into a separation agreement with Mr. Whitelaw upon his resignation.

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The following table sets forth the estimated payments and benefits that would be provided to each NEO employed at the end of fiscal 2022 in the event the Named Executive Officer’s employment is terminated as described above. In accordance with applicable SEC disclosure rules, these estimates assume a termination date of December 30, 2022.

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Continued Health | ​ | Equity | ​ | ​
​ |  | Severance |  | Coverage |  | Acceleration(1) |  | Total
Name | ​ | ($) | ​ | ($) | ​ | ($) | ​ | ($)
Thomas D. Brisbin | ​ | 1,010,000 | ​ | — | ​ | 928,218 | ​ | 1,938,218
Michael A. Bieber | ​ | — | ​ | — | ​ | 532,483 | ​ | 532,483
Creighton K. Early | ​ | — | ​ | — | ​ | 112,098 | ​ | 112,098
Micah H. Chen | ​ | — | ​ | — | ​ | 156,723 | ​ | 156,723
Paul M. Whitelaw(2) | ​ | — | ​ | — | ​ | 112,098 | ​ | 112,098

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| (1) | Based on the $17.85 closing price of our common stock on December 30, 2022. |

| (2) | Mr. Whitelaw resigned from his position as Senior Vice President, Business Development, effective February 1, 2023. |

Pay Ratio Disclosure

The 2022 annual total compensation of the Company’s CEO was $2,086,033. The 2022 annual total compensation of our median employee (excluding our CEO) was $68,391. The ratio between the two amounts is 30.5. The Company believes that the ratio of pay included above is a reasonable estimate calculated in a manner consistent with applicable SEC rules.

To determine the pay ratio, we took the following steps:

| ■ | We identified the median employee using our employee population consisting of 1,490 employees on December 30, 2022 (excluding our CEO). We identified the median employee based on gross wages paid in 2022 as reported on Form W-2. We did not make any assumptions, adjustments or estimates with respect to gross wages paid in 2022 despite the fact that more than 29% of our employee population works less than full time.

| ■ | As required under the SEC rules, after identifying our median employee, we calculated annual total compensation for both our median employee and our CEO using the same methodology that we used to determine our NEOs’ annual compensation for the Summary Compensation Table above.

This information is being provided for compliance purposes. Neither the CC nor management of the Company used the pay ratio measure in making compensation decisions. Given the different methodologies that companies use to determine an estimate of their pay ratio, the estimated ratio reported above should not be used as a basis for comparison between companies.

Pay vs. Performance

The disclosures below provide information about the relationship between executive compensation actually paid and certain performance metrics of the Company. The following table provides information regarding compensation for our Principal Executive Officer (“PEO”) and average compensation related to our other NEOs versus Company performance.

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Value of Initial Fixed $100 Investment Based on | ​ | ​ | ​ | ​ | ​ | ​
Year |  | Summary Compensation Table Total for PEO(1) |  | Compensation Actually Paid to PEO(2) |  | Average Summary Compensation Table Total for non-PEO NEOs(3) |  | Average Compensation Actually Paid to Non-PEO NEOs(2) |  | Total Shareholder Return(4) |  | Peer Group Total Shareholder Return(4) |  | Net Income |  | Company Selected Measure - Adjusted EBITDA(5)
2022 | ​ | $ | 2,086,033 | ​ | $ | (1,401,302) | ​ | $ | 895,360 | ​ | $ | (85,083) | ​ | $ | 50.70 | ​ | ​ | 70.39 | ​ | $ | (8,448,000) | ​ | $ | 23,276,000
2021 | ​ | $ | 2,990,848 | ​ | $ | 959,656 | ​ | $ | 757,809 | ​ | $ | 270,012 | ​ | $ | 84.40 | ​ | ​ | 143.34 | ​ | $ | (8,417,000) | ​ | $ | 27,526,000
2020 | ​ | $ | 2,190,963 | ​ | $ | 6,791,079 | ​ | $ | 893,569 | ​ | $ | 2,130,191 | ​ | $ | 133.59 | ​ | ​ | 141.30 | ​ | $ | (14,496,000) | ​ | $ | 28,126,000

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| (1) | Dr. Brisbin is our principal executive officer for the years ended 2022, 2021 and 2020.

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| (2) | Amounts presented under “Compensation Actually Paid” do not reflect actual amounts of compensation paid to the PEO and other Non-PEO NEOs; rather, “Compensation Actually Paid” amounts are calculated in accordance with Item 402(v) of Regulation S-K. The following table presents the detail of amounts deducted and added to the Summary Compensation Table total to calculate “Compensation Actually Paid”:

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​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2022 | ​ | 2021 | ​ | 2020
​ |  | PEO |  | Average of Non-PEO NEOs |  | PEO |  | Average of Non-PEO NEOs |  | PEO |  | Average of Non-PEO NEOs
Total Compensation as reported on Summary Compensation Table | ​ | $ | 2,086,033 | ​ | $ | 895,360 | ​ | $ | 2,990,848 | ​ | $ | 757,809 | ​ | $ | 2,190,963 | ​ | $ | 893,569
Subtract pension values reported in Summary Compensation Table | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Subtract the fair value of stock awards reported in Summary Compensation Table | ​ | $ | (992,230) | ​ | $ | (373,786) | ​ | $ | (2,242,045) | ​ | $ | (342,801) | ​ | $ | (1,183,022) | ​ | $ | (434,664)
Add pension value attributable to current year’s service and any change in pension value attributable to plan amendments made in the current year | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Add fair value as of end of covered year of equity awards granted in covered year that are unvested and outstanding at end of covered year | ​ | $ | 1,115,655 | ​ | $ | 345,849 | ​ | $ | 3,080,088 | ​ | $ | 633,618 | ​ | $ | 3,978,389 | ​ | $ | 1,290,198
Add dividends paid on unvested shares/share units | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Add change in fair value from end of prior year to end of covered year for equity awards granted in prior years that were outstanding and unvested at end of covered year | ​ | $ | (325,313) | ​ | $ | (10,844) | ​ | $ | (629,051) | ​ | $ | (142,890) | ​ | $ | 2,180,415 | ​ | $ | 487,756
Add equity awards that are granted and vest in the covered year, the fair value as of the vesting date | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Add change in fair value from end of prior year to vesting date for equity awards granted in prior years that vested during covered year | ​ | $ | (3,285,447) | ​ | $ | (941,662) | ​ | $ | (2,240,184) | ​ | $ | (635,724) | ​ | $ | (375,666) | ​ | $ | (106,668)
Subtract equity awards granted in prior years that are forfeited in covered year, the fair value of such equity awards as of the end of the prior year | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Compensation Actually Paid | ​ | $ | (1,401,302) | ​ | $ | (85,083) | ​ | $ | 959,656 | ​ | $ | 270,012 | ​ | $ | 6,791,079 | ​ | $ | 2,130,191

| (a) | There are no adjustments for pension or dividend payments as the Company does not have supplemental executive retirement plans and does not pay dividends.

| (3) | In 2022, our other NEOs consisted of Michael A. Bieber, President, Creighton K. Early, Chief Financial Officer, Micah H. Chen, General Counsel, and Paul Whitelaw, former Senior Vice President Business Development. In 2021, our other NEOs consisted of Michael A. Bieber, President, Creighton K. Early, Chief Financial Officer, Stacy B. McLaughlin, former Chief Financial Officer, Micah H. Chen, General Counsel, and Paul Whitelaw, former Senior Vice President Business Development. In 2020, our other NEOs consisted of Michael A. Bieber, President, Stacy B. McLaughlin, former Chief Financial Officer, Daniel Chow, former Chief Operating Officer, and Adam C. Procell, former Chief Strategy Officer.

| (4) | Total shareholder return assumes that $100 was invested on the measurement date in Willdan Group, Inc. common stock and the peer group as set forth below. This shareholder return assumes reinvestment of all dividends. The customized peer group for 2022 consists of: American Superconductor Corporation, Atlas Technical Consultants, Inc., Bowman Consulting Group Ltd., C3.ai, Inc., Charah Solutions, Inc., Exponent, Inc., FTC Solar, Inc., ICF International, Inc., Limbach Holdings, Inc., Montrose Environmental Group, Inc., NV5 Global, Inc., Orion Energy Systems, Inc., RCM Technologies, Inc., Resources Connection, Inc., and Stem, Inc. The customized peer group for 2021 and 2020 consists of: Ameresco, Inc., Charah Solutions, Inc., Cypress Environmental Partners, L.P., Exponent, Inc., Hill International, Inc., Limbach Holdings, Inc., NV5 Global, Inc., RCM Technologies, Inc., and Resources Connection, Inc.

| (5) | The Company has determined that adjusted EBITDA from operations is the financial performance measure that, in the Company’s assessment, represents the most important performance measure (that is not otherwise required to be disclosed in the table) used by the Company to link compensation actually paid to the Company’s NEOs for the most recently completed fiscal year. Adjusted EBITDA is a non-GAAP measure and it means the Company’s net income (loss) as determined in accordance with GAAP, plus (1) interest expense, (2) income tax expense (benefit), (3) stock-based compensation, (4) interest accretion, (5) depreciation and amortization, (6) transaction costs, (7) (gain) loss on sale of equipment, and (8) plus or minus the effect of any extraordinary item or extraordinary transaction. See Appendix C for the Company’s reconciliation of Net Income to Adjusted EBITDA.

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Pay vs. Performance Financial Measures

As described in detail in the CD&A, the Company’s executive compensation program consists of several compensation elements reflecting the Company’s pay-for-performance philosophy. The most important financial performance measures used to link compensation actually paid to the Company’s NEOs with the Company’s performance for 2022 are as follows:

§ Adjusted EBITDA

§ Adjusted Diluted Earnings per Share

§ Net Revenue

§ Relative Total Shareholder Return

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Analysis of the Information Presented in Pay vs. Performance

Compensation Actually Paid and Cumulative Total Shareholder Return

The amount of compensation actually paid to Dr. Brisbin and the average amount of compensation actually paid to the Company’s other NEOs (as a group) is generally aligned with the Company’s cumulative total shareholder return (“TSR”). The alignment of compensation actually paid with the Company’s cumulative TSR is a direct result of the significant portion of the compensation actually paid to the Company’s NEOs that is derived from equity awards.

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Compensation Actually Paid and Net Income

The amount of compensation actually paid to Dr. Brisbin and the average amount of compensation actually paid to the Company’s other NEOs (as a group) is inversely aligned with the Company’s net income. As the performance of the Company, as measured by net income, has improved over the past three years, compensation actually paid to the NEOs has decreased. This is due to the calculation of compensation actually paid, which does not incorporate net income metrics in its calculation but rather is primarily driven by changes in the fair market value of equity awards.

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Compensation Actually Paid and Adjusted EBITDA

The amount of compensation actually paid to Dr. Brisbin and the average amount of compensation actually paid to the Company’s other NEOs (as a group) is generally aligned with the Company’s Adjusted EBITDA. As previously discussed, the Company utilizes Adjusted EBITDA as one of the performance goals for its PBRSUs that are awarded to the NEOs.

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All information provided above under the “Pay vs. Performance” heading will not be deemed to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended, whether made before or after the date hereof and irrespective of any general incorporation language in any such filing, except to the extent the Company specifically incorporates such information by reference therein.

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Equity Compensation Plan Information

The following table sets forth, for each of our equity compensation plans, the number of shares of common stock subject to outstanding awards, the weighted-average exercise price of outstanding options, and the number of shares remaining available for future award grants as of December 30, 2022. Our equity compensation plans consist of our 2006 Plan, our 2008 Plan and our ESPP.

​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | Number of
​ | ​ | ​ | ​ | ​ | ​ | ​ | securities
​ | ​ | ​ | ​ | ​ | ​ | ​ | remaining available
​ | ​ | Number of securities | ​ | ​ | ​ | ​ | for future issuance
​ | ​ | to be issued upon | ​ | ​ | ​ | ​ | under equity
​ | ​ | exercise of | ​ | ​ | ​ | ​ | compensation
​ | ​ | outstanding options, | ​ | Weighted-average | ​ | plans
​ | ​ | restricted stock | ​ | exercise price of | ​ | (excluding
​ | ​ | units, warrants | ​ | outstanding options, | ​ | securities reflected
​ | ​ | and rights | ​ | warrants and rights | ​ | in column (a))
Plan Category |  | (a)(1)(2) |  | (b)(3) |  | (c)(4)
Equity compensation plans approved by security holders |  | 979,996 | ​ | $ | 20.38 |  | 756,045
Equity compensation plans not approved by security holders |  | — | ​ |  | — |  | —
Totals |  | 979,996 | ​ | $ | 20.38 |  | 756,045

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(1) | Represents 815,771 underlying of shares of common stock related to outstanding options and 164,225 shares of common stock related to outstanding PBRSUs.

(2) | Excludes 134,930 shares subject to outstanding restricted stock awards.

(3) | Excludes PBRSUs from the weighted-average price calculation.

(4) | Represents 391,902 shares available for future issuance under our 2008 Plan, and 364,143 shares available for future issuance under our ESPP. Shares available under our 2008 Plan may be used for any type of award authorized in that plan (subject to certain limitations of the plan), including stock options, stock appreciation rights, stock units, restricted stock, performance-based awards, stock bonuses and other awards payable in shares of Company common stock. This column does not reflect the shares that will become available under our 2008 Plan and our ESPP if stockholders approve the amendment to our 2008 Plan contained in Proposal 4 and the amendment to our ESPP contained in Proposal 5.

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Report of the Audit Committee

Management is responsible for the Company’s internal controls and financial reporting process, including our internal control over financial reporting, and for preparing our consolidated financial statements. Crowe, an independent registered public accounting firm, is responsible for performing an independent audit of our consolidated financial statements in accordance with the standards of the Public Company Accounting Oversight Board (“PCAOB”) and for expressing an opinion on the conformity of our audited consolidated financial statements to accounting principles generally accepted in the United States of America in all material respects. In this context, the responsibility of the Audit Committee is to oversee our accounting and financial reporting processes and the independent audit of our consolidated financial statements.

In the performance of its oversight function, the Audit Committee reviewed and discussed with management and Crowe our audited consolidated financial statements as of and for the year ended December 30, 2022. The Audit Committee also discussed with Crowe the matters required to be discussed by the applicable requirements of the PCAOB and the SEC.

The Audit Committee received the written communication from Crowe under the applicable requirements of the PCAOB, which requires our independent registered public accounting firm to disclose in writing to the Audit Committee, at least annually, all relationships between them and us that, in their judgment, reasonably may be thought to bear on independence and to discuss their independence with the Audit Committee. The Audit Committee discussed with Crowe its independence and considered in advance whether the provision of any non-audit services by Crowe is compatible with maintaining its independence. The Audit Committee also received and reviewed a report by Crowe outlining communications required by Nasdaq listing standards (1) reviewing the firm’s internal quality control procedures; (2) describing any material issue raised by (a) the most recent internal quality control review of the firm, (b) peer review of the firm, or (c) any inquiry or investigation by governmental or professional authorities, within the preceding five years, with respect to one or more independent audits carried out by the firm, and any steps taken to deal with such issues; and (3) assessing Crowe’s independence, including all relationships between Crowe and the Company.

Based on the reviews and discussions of the Audit Committee described above, and in reliance on the unqualified opinion of Crowe dated March 9, 2023, regarding our audited consolidated financial statements as of and for the year ended December 30, 2022, and subject to the limitations on the responsibilities of the Audit Committee noted above and in the Audit Committee’s charter, the Audit Committee recommended to the Board, and the Board approved, that such audited and consolidated financial statements be included in our annual report on Form 10-K for the year ended December 30, 2022, that was filed with the SEC.

Members of the Audit Committee

Cynthia A. Downes (Chair)

Steve A. Cohen

Keith W. Renken

The preceding Report of the Audit Committee shall not be deemed filed under the Securities Act of 1933, as amended, or the Exchange Act, except to the extent the Company specifically incorporates this Report by reference into a filing under either of such Acts. The Report shall not be deemed soliciting material, or subject to Regulation 14A or 14C or the liabilities of Section 18 of the Securities Exchange Act.

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Security Ownership Information

Except as otherwise noted, the following table sets forth information as of April 18, 2023 with respect to: (i) each person known by us to own beneficially more than 5% of the outstanding shares of our common stock, based upon Schedule 13G and Schedule 13D reports filed with the SEC, (ii) each of our directors and director nominees, (iii) each of our NEOs (as defined in Item 11. Executive Compensation) and (iv) our directors and executive officers as a group.

Unless otherwise noted below, the address of the persons listed in the table is c/o Willdan Group, Inc., 2401 East Katella Avenue, Suite 300, Anaheim, California 92806. The amounts and percentages of common stock beneficially owned are reported on the basis of regulations of the SEC governing the determination of beneficial ownership of securities. Under the rules of the SEC, a person is deemed to be a “beneficial owner” of a security if that person has or shares “voting power,” which includes the power to vote or to direct the voting of such security, or “investment power,” which includes the power to dispose of or to direct the disposition of such security or has the right to acquire such powers within 60 days. Under SEC rules, more than one person may be deemed a beneficial owner of the same securities and a person may be deemed a beneficial owner of securities as to which that person has no economic interest. Except as otherwise noted, we believe, based on the information furnished to us, that the persons named in the table below have sole voting and investment power with respect to all shares of common stock reflected as beneficially owned, subject to applicable community property laws. All percentages in the following table are based on a total of 13,489,111 shares of common stock outstanding on April 18, 2023.

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​ | ​ | ​ | ​ | ​
​ | ​ | Amount of | Percent of |
​ | ​ | Beneficial | Common |
Name and Address of Stockholder |  | Ownership | Stock |
5% Stockholders | ​ | ​ | ​ | ​
Amundi Asset Managerment (1) | ​ | 1,690,216 | 12.5 | %
Forager Fund, LP (2) | ​ | 1,396,305 | 10.4 | %
BlackRock, Inc. (3) | ​ | 760,486 | 5.6 | %
Handelsbanken Fonder AB (4) | ​ | 745,077 | 5.5 | %
Named Executive Officers, Directors and Director Nominees | ​ | ​ | ​ | ​
Thomas D. Brisbin (5) |  | 715,004 | 5.3 | %
Michael A. Bieber (6) |  | 329,450 | 2.4 | %
Micah H. Chen (7) |  | 93,715 | * | ​
Steven A. Cohen (8) | ​ | 21,735 | * | ​
Cynthia A. Downes (9) | ​ | 4,058 | * | ​
Creighton K. Early (10) | ​ | 105,179 | * | ​
Dennis V. McGinn (11) | ​ | 11,014 | * | ​
Wanda K. Reder (12) | ​ | 3,912 | * | ​
Keith W. Renken (13) |  | 138,135 | 1.0 | %
Mohammad Shahidehpour (14) |  | 12,207 | * | ​
Paul M. Whitelaw (15) |  | 48,219 | * | ​
All current Directors, Director Nominees and Executive Officers as a group (10 persons) |  | 1,434,409 | 10.6 | %

* The percentage of shares beneficially owned by this executive officer or director does not exceed one percent of the Company’s outstanding stock.

(1) | Beneficial ownership information is given as of December 31, 2022 and was obtained from a Schedule 13G/A filed with the SEC on February 10, 2023 by Amundi Asset Management. The Schedule 13G/A states that Amundi Asset Management has shared voting power over 1,439,733 shares and shared dispositive power over 1,690,216 shares. The principal office or business address of Amundi Asset Management is 90 Boulevard Pasteur, 75015 Paris, France.

(2) | Beneficial ownership information is given as of December 31, 2022 and was obtained from a Schedule 13G/A filed with the SEC on February 15, 2023 by Forager Fund, LP, a Delaware limited partnership (the “Fund”), Forager Capital Management, LLC, a Delaware limited liability company and the general partner of the Fund (the “Investment Adviser”), Edward Kissel and Robert MacArthur. The Schedule 13G/A states that the Fund owns 944,661 shares of common stock, (ii) the Investment Adviser, as the sole general partner of the Fund and as the investment adviser of a separate account, beneficially owns 1,384,632 shares of common stock, (iii) Mr. Kissel, as the managing partner of the Investment Adviser, beneficially owns 1,396,034 shares of common stock and (iv) Mr. MacArthur, as the managing partner of the Investment Adviser, beneficially owns 1,384,903 shares of common stock. Each of the Fund and the Investment Adviser has the sole power to vote and dispose of the shares of common stock beneficially owned by such entity (as described above). Mr. Kissel has the sole power to vote and dispose of 11,402

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| shares of common stock, and has the shared power to vote and dispose of 1,384,632 shares of common stock. Mr. MacArthur has the sole power to vote and dispose of 271 shares of common stock, and has the shared power to vote and dispose of 1,384,632 shares of common stock. The principal office or business address of Forager Fund, LP is 2024 3rd Ave. N, Suite 201, Birmingham, AL 35203.

(3) | Beneficial ownership information is given as of December 31, 2022 and was obtained from a Schedule 13G/A filed with the SEC on February 1, 2023 by BlackRock, Inc. The Schedule 13G/A states that BlackRock, Inc. has sole voting power over 745,665 shares and sole dispositive power over 760,486 shares. The principal office or business address of BlackRock, Inc. is 55 East 52nd Street, New York, NY 10055.

(4) | Beneficial ownership information is given as of December 31, 2022 and was obtained from a Schedule 13G/A filed with the SEC on January 23, 2023 by Handelsbanken Fonder AB. The Schedule 13G/A states that Handelsbanken Fonder AB has sole voting power over 745,077 shares and sole dispositive power over 745,077 shares. The principal office or business address of Handelsbanken Fonder AB is SE-106 70, Stockholm, Sweden.

(5) | The 715,004 shares of common stock held directly by Dr. Brisbin consist of 390,004 shares of common stock and 325,000 shares of common stock subject to options exercisable on or before June 17, 2023. The 390,004 shares of common stock held directly by Dr. Brisbin, of which (i) 17,500 shares of restricted stock that vest in three substantially equal installments on each of March 7, 2024, March 7, 2025 and March 7, 2026 and (ii) 12,500 shares of restricted stock that vest in two substantially equal installments on each of March 9, 2024 and March 9, 2025.

(6) | The 329,450 shares of common stock held directly by Mr. Bieber consist of 135,019 shares of common stock and 194,431 shares of common stock subject to options exercisable on or before June 17, 2023. The 135,019 shares of common stock held directly by Mr. Bieber, of which 13,300 shares of restricted stock that vest in three substantially equal installments on each of March 7, 2024, March 7, 2025 and March 7, 2026.

(7) | The 93,715 shares of common stock held directly by Mr. Chen consist of 23,715 shares of common stock and 70,000 shares of common stock subject to options exercisable on or before June 17, 2023. The 23,715 shares of common stock held directly by Mr. Chen, of which (i) 2,800 shares of restricted stock that vest in three substantially equal installments on each of March 7, 2024, March 7, 2025 and March 7, 2026 and (ii) 2,500 shares of restricted stock that vest on May 4, 2023.

(8) | The 21,735 shares of common stock held directly by Mr. Cohen include 3,481 shares of restricted stock, of which (i) 892 shares of restricted stock vest on June 9, 2023 and (ii) 2,589 shares of restricted stock vest in two substantially equal installments on each of June 9, 2023 and June 9, 2024.

(9) | The 4,058 shares of common stock held directly by Ms. Downes includes 3,324 shares of restricted stock, of which (i) 735 shares of restricted stock vest on August 4, 2023 and (ii) 2,589 shares of restricted stock vest in two substantially equal installments on each of June 9, 2023 and June 9, 2024.

(10) | The 105,179 shares of common stock held directly by Mr. Early consist of 64,499 shares of common stock and 40,680 shares of common stock subject to options exercisable on or before June 17, 2023. The 64,499 shares of common stock held directly by Mr. Early, of which 22,800 shares of restricted stock that vest in three substantially equal installments on each of March 7, 2024, March 7, 2025 and March 7, 2026.

(11) | The 11,014 shares of common stock held directly by Vice Admiral McGinn include 3,481 shares of restricted stock, of which (i) 892 shares of restricted stock vest on June 9, 2023 and (ii) 2,589 shares of restricted stock vest in two substantially equal installments on each of June 9, 2023 and June 9, 2024.

(12) | The 3,912 shares of common stock held directly by Ms. Reder include 3,251 shares of restricted stock, of which (i) 662 shares of restricted stock vest on December 6, 2023, and (ii) 2,589 shares of restricted stock vest in two substantially equal installments on each of June 9, 2023 and June 9, 2024.

(13) | The 138,135 shares of common stock held by Mr. Renken consist of 57,735 shares of common stock held directly by Mr. Renken and 80,400 shares of common stock held by the LVRJC Partnership. Mr. Renken is the managing partner of the LVRJC Partnership and has sole voting and investment control over our shares of common stock held therein. The 57,735 shares of common stock held directly by Mr. Renken include 3,481 shares of restricted stock, of which (i) 892 shares of restricted stock vest on June 9, 2023 and (ii) 2,589 shares of restricted stock vest in two substantially equal installments on each of June 9, 2023 and June 9, 2024.

(14) | The 12,207 shares of common stock held directly by Dr. Shahidehpour include 3,481 shares of restricted stock, of which (i) 892 shares of restricted stock vest on June 9, 2023 and (ii) 2,589 shares of restricted stock vest in two substantially equal installments on each of June 9, 2023 and June 9, 2024.

(15) | The 48,219 shares of common stock held directly by Mr. Whitelaw consist of 25,882 shares of common stock and 22,337 shares of common stock subject to options exercisable on or before June 17, 2023. Mr. Whitelaw resigned as our Senior Vice President, Business Development, effective February 1, 2023. Beneficial ownership information is based on information contained in the last Form 4 filed by Mr. Whitelaw with the SEC prior to February 1, 2023, adjusted to give effect to subsequent transactions through April 18, 2023 of which we are aware in connection with employment-related equity.

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Section 16(a) of the Exchange Act requires our executive officers and directors, and persons who own more than 10% of a registered class of our equity securities, to file reports of ownership and changes in ownership with the SEC and the Nasdaq Global Market. Officers, directors and greater than 10% stockholders are required by the SEC’s regulations to furnish us with copies of all Section 16(a) forms they file. Based solely on our review of the copies of such reports furnished to us, all Section 16(a) filing requirements applicable to our executive officers, directors and greater than 10% beneficial owners were timely satisfied in fiscal 2022.

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Certain Relationships and Related Person Transactions

Related Person Transactions

The following provides a description of certain relationships and related transactions since the beginning of fiscal 2022 between some of our directors, executive officers and holders of 5% or more of our common stock and us or our subsidiaries and affiliates involving an amount that exceeded or may exceed $120,000 in the aggregate.

Indemnification of Officers and Directors. We have entered into indemnification agreements with all of our current executive officers and directors. These agreements require us to indemnify these individuals to the fullest extent permitted under Delaware law against liabilities that may arise by reason of their service to us and to advance expenses reasonably incurred as a result of any proceeding against them as to which they could be indemnified. Additionally, we may enter into indemnification agreements with any future directors or executive officers. In fiscal 2022, we did not incur any indemnification related expenses as a result of indemnification agreements with our current executive officers and directors.

Related Person Transaction Policy

In March 2007, the Board adopted a policy addressing the Company’s procedures with respect to the review, approval and ratification of “related person transactions” that are required to be disclosed pursuant to Item 404(a) of Regulation S-K. The policy provides that any transaction, arrangement or relationship, or any series of similar transactions, in which the Company was, is or will be a participant, the amount involved exceeds $120,000, and a “related person” (as defined in the policy) has or will have a direct or indirect material interest (each such transaction, a “Related Person Transaction”) shall be subject to review and approval or ratification by the AC. In its review of Related Person Transactions, the AC shall review the material facts and circumstances of the transaction and shall take into account certain factors, where appropriate, based on the particular facts and circumstances, including (i) the nature of the “related person’s” interest in the transaction, (ii) the approximate dollar value of the amount involved in the Related Person Transaction, (iii) whether the transaction was taken in the Company’s ordinary course of business, (iv) whether the transaction with the “related person” is proposed to be, or was, entered into on terms no less favorable to the Company than terms that could have been reached with an unrelated third party and (v) the purpose of, and the potential benefits to the Company of, the Related Person Transaction.

No member of the AC may participate in the review, approval or ratification of a transaction with respect to which he or she is a “related person” provided that such member can be counted for purposes of a quorum and shall provide such information with respect to the transaction as may be reasonably requested by other members of the AC or the Board.

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Other Information

When and where is the Annual Meeting?

The Annual Meeting will be held on June 8, 2023 at 10:00 a.m. Pacific Time, via live audiocast on the Internet. You may register to listen to and participate in the Annual Meeting by going to https://edge.media-server.com/mmc/p/tydzawp6.

What am I being asked to vote on at the Annual Meeting?

At the Annual Meeting, stockholders will act on the following matters:

| 1. | Election of the seven director nominees named in this Proxy Statement to serve until the Company’s 2024 annual meeting of stockholders or until their respective successors are duly elected and qualified or until their earlier resignation or removal; ​

| 2. | Ratification of the appointment of Crowe as the Company’s independent registered public accounting firm for fiscal year 2023; ​

| 3. | Approval, on a non-binding advisory basis, of our named executive officer compensation;

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| 4. | Approval of an amendment to the Company’s 2008 Performance Incentive Plan (the “2008 Plan”), including an increase in the number of shares available for grant under the 2008 Plan; and

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| 5. | Approval of an amendment to the Company’s 2006 Employee Stock Purchase Plan (the “ESPP”), including an increase in the number of shares available for issuance under the ESPP.

Stockholders will also be asked to consider and transact such other business as may properly come before the Annual Meeting or any postponement or adjournment of the Annual Meeting.

How does the Board recommend that I vote?

The Board recommends that you vote your shares of our common stock:

| ■ | “FOR” each of the director nominees named in this Proxy Statement;

| ■ | “FOR” the ratification of the appointment of Crowe for fiscal 2023;

| ■ | “FOR” the approval, on a non-binding advisory basis, of our named executive officer compensation;

| ■ | “FOR” an amendment to the Company’s 2008 Plan, including an increase in the number of shares available for grant under the 2008 Plan; and

| ■ | “FOR” an amendment to the Company’s ESPP, including an increase in the number of shares available for issuance under the ESPP

Who may vote?

Only holders of record of our common stock, at the close of business on the Record Date, are entitled to notice of and to vote at the Annual Meeting. Holders of common stock are entitled to cast one vote for each share held by them on each matter to be voted upon. As of the Record Date, there were 13,489,111 shares of common stock issued and

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outstanding. Our common stock is the only class of securities authorized to vote. Stockholders are not entitled to cumulative voting rights in the election of directors.

What constitutes a quorum at the Annual Meeting?

Representation by presence or by proxy, of holders of at least a majority of shares entitled to vote is necessary to constitute a quorum for the transaction of business at the Annual Meeting. As of the Record Date, 13,489,111 shares of our common stock were outstanding and entitled to vote. Abstentions and “broker non-votes” will count toward the presence of a quorum.

What happens if a quorum is not present at the Annual Meeting?

If a quorum is not present at the scheduled time of the Annual Meeting, the Annual Meeting may be adjourned to another date or time until a quorum is present. The date and time of the adjourned meeting will be announced at the meeting when the adjournment is taken, and no other notice will be given unless the adjournment is for more than 30 days or unless after the adjournment a new record date is fixed for the adjourned meeting. Any adjournment of the Annual Meeting can be accessed at the same website listed above and you may vote at any adjournment using your same 15-digit control number.

How do I vote?

Stockholders of Record. If you are a registered stockholder as of the close of business on the Record Date, you have several ways to vote your shares:

| ■ | Via the Internet. You may submit a proxy over the Internet at www.investorvote.com/WLDN, 24 hours a day, seven days a week. You will need the 15-digit control number included on your Notice of Internet Availability or your proxy card (if you received a printed copy of the proxy materials) or included in the email to you (if you received the proxy materials by email).

| ■ | By Telephone. You may submit a proxy using a touch-tone telephone by calling toll free 1-800-652-8683, 24 hours a day, seven days a week. You will need the 15-digit control number included on your Notice of Internet Availability or your proxy card (if you received a printed copy of the proxy materials) or included in the email to you (if you received the proxy materials by email).

| ■ | By Mail. If you received printed proxy materials, you may direct how your shares are voted at the Annual Meeting by completing, signing, and dating each proxy card received and returning it in the prepaid envelope. Sign your name exactly as it appears on the proxy card. Proxy cards submitted by mail must be received no later than June 7, 2023 to be voted at the Annual Meeting.

| ■ | During the Annual Meeting. Instructions on how to vote while participating in the Annual Meeting live via the Internet are listed on your proxy card.

Beneficial Owners. If your stock is held by a broker, bank or other nominee (in “street name”), you should have received a Notice of Internet Availability or voting instruction form from the broker, bank or other nominee holding your shares. You should follow the instructions in the Notice of Internet Availability or voting instruction form in order to instruct your broker, bank or other nominee on how to vote your shares. The availability of telephone and Internet voting will depend on the voting process of the broker, bank or nominee.

What is the deadline for submitting my proxy?

If you are a stockholder of record, your proxy must be received by telephone or the Internet by the conclusion of the Annual Meeting in order for your shares to be voted. However, if you are a stockholder of record and you received a copy of the proxy materials by mail, you may instead mark, sign, date and return the proxy card you received in the accompanying prepaid and addressed envelope so that it is received by us no later than June 7, 2023 in order for your

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shares to be voted at the Annual Meeting. If you hold your shares in street name, please provide your voting instructions by the deadline specified by the bank, broker or other nominee who holds your shares.

Can I revoke or change my vote after I submit my proxy?

Yes. Even after you have submitted your proxy, you may change your vote at any time before the proxy is exercised as follows:

Stockholders of Record. If you are a stockholder of record, you may change or revoke a previously submitted proxy at any time before it is voted at the Annual Meeting by:

| ■ | delivering a duly executed proxy bearing a later date;

| ■ | submitting a later-dated vote by telephone or via the Internet – only your latest Internet or telephone proxy received by 1:00 a.m. Pacific time on June 8, 2023, will be counted;

| ■ | delivering a written revocation to the Secretary of the Company at the address of the Company set forth above before the Annual Meeting; or

| ■ | attending the Annual Meeting live via audiocast and voting your shares electronically at the Annual Meeting. Any stockholder of record as of the Record Date attending the Annual Meeting may vote, his or her shares electronically at the Annual Meeting, whether or not a proxy has been previously given, but the presence (without further action) of a stockholder at the Annual Meeting will not constitute revocation of a previously given proxy.

Beneficial Owners. If you are a beneficial owner of your shares, you must contact the broker, bank or other nominee holding your shares and follow their instructions for revoking or changing your vote.

If I return my proxy card or voting instruction form without specifying voting instructions on it, how will my shares be voted?

Stockholders of Record. Unless you give other instructions on your proxy, the persons named as proxy holders on the proxy will vote in accordance with the recommendations of our Board. The Board’s recommendations are set forth together with the description of each matter in this Proxy Statement. In summary, the Board unanimously recommends a vote: “FOR” election of each of the seven nominees for director, “FOR” ratification of the appointment of Crowe as the Company’s independent registered public accounting firm for fiscal 2023, “FOR” the approval, on a non-binding advisory basis, of our named executive officer compensation, “FOR” an amendment to the 2008 Plan, including an increase in the number of shares available for grant under the 2008 Plan, and “FOR” an amendment to the Company’s ESPP, including an increase in the number of shares available for issuance under the ESPP.

With respect to any other matter that properly comes before the meeting, the proxy holders will vote as recommended by the Board or, if no recommendation is given, at the discretion of the proxy holders.

Beneficial Owners. If you hold your shares in street name through a brokerage account and you do not submit voting instructions to your broker, your broker may generally vote your shares in its discretion on routine matters. However, a broker cannot vote shares held in street name on non-routine matters unless the broker receives voting instructions from the street name holder. Proposal No. 2 (ratification of the appointment of Crowe as our independent registered public accounting firm for fiscal 2023) is considered routine under applicable rules of the New York Stock Exchange, while each of the other items to be submitted for a vote of stockholders at the Annual Meeting is considered non-routine. Accordingly, if you hold your shares in street name through a brokerage account and you do not submit voting instructions to your broker, your broker may exercise its discretion to vote on Proposal No. 2 at the Annual Meeting, but will not be permitted to vote your shares on any of the other proposals at the Annual Meeting. If your broker exercises this discretion, your shares will be voted on Proposal No. 2 in the manner directed by your broker, but your shares will constitute “broker non-votes” on each of the other items to be submitted for a vote of stockholders at the Annual Meeting.

What vote is required to approve each proposal and what effect do votes withheld, abstentions and broker non-votes have?

Election of Directors (Proposal No. 1). Once a quorum has been established, pursuant to our amended and restated bylaws, the affirmative vote of a plurality of the shares present or represented by proxy and entitled to vote on the

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matter at the Annual Meeting will be required for the election of each director nominee, meaning that the persons receiving the highest number of FOR votes, up to the total number of directors to be elected at the Annual Meeting, will be elected. Stockholders are not permitted to cumulate their shares for the purpose of electing directors. For purposes of Proposal No. 1 (election of directors), you may vote “FOR” any or all of the nominees or “WITHHOLD” your vote from any or all of the nominees. Shares voted WITHHOLD and broker non-votes will not be counted in determining the outcome of the director nominees’ election.

Other Items (Proposal Nos. 2, 3, 4 and 5). Once a quorum has been established, pursuant to our amended and restated bylaws, approval of each of the other items to be submitted for a vote of stockholders at the Annual Meeting requires the affirmative vote of a majority of the shares present or represented by proxy at the Annual Meeting and entitled to vote on such proposal. Notwithstanding this vote standard required by our Bylaws, Proposal No. 2 (ratification of the appointment of Crowe as our independent registered public accounting firm for fiscal 2023) and Proposal No. 3 (approval, on a non-binding advisory basis, of our named executive officer compensation) are advisory only and are not binding on us. Our Board will consider the outcome of the vote on each of these items in considering what action, if any, should be taken in response to the vote by stockholders.

For purposes of Proposal No. 2 (ratification of the appointment of Crowe as our independent registered public accounting firm for fiscal 2023), Proposal No. 3 (approval, on a non-binding advisory basis, of our named executive officer compensation), Proposal No. 4 (approval of an amendment to our 2008 Plan, including an increase in the number of shares available for grant under the 2008 Plan), and Proposal 5 (approval of an amendment to our ESPP, including an increase in the number of shares available for issuance under the ESPP) you may vote “FOR,” “AGAINST” or “ABSTAIN.”

In each of Proposal Nos. 2, 3, 4 and 5, abstentions will have the same effect of a vote “AGAINST” such proposal. If you hold your shares in street name through a brokerage account and you do not instruct your nominee how to vote your shares, your nominee nonetheless will have the authority, but is not required, to vote your shares on Proposal No. 2, but will not be permitted to vote your shares on any of the other proposals at the Annual Meeting. If your nominee exercises this discretion, your shares will be voted on Proposal No. 2 in the manner directed by your nominee, but your shares will constitute broker non-votes on Proposal Nos. 1, 3, 4 and 5, and will not be counted in determining the outcome of those items.

Who tabulates the votes?

Stockholder votes will be tabulated by Computershare Trust Company, N.A., as inspector of election for the Annual Meeting.

Where can I find the voting results of the Annual Meeting?

Our intention is to announce the preliminary voting results at the Annual Meeting and to publish the final results within four business days after the Annual Meeting on a Form 8-K to be filed with the SEC.

What do I do if I receive more than one proxy or set of voting instructions?

​If you received more than one Proxy Statement or more than one proxy card or voting instruction form (if you receive your proxy materials by mail), your shares are likely registered in different names or with different addresses or are in more than one account. You must separately vote the shares shown on each Proxy Statement, proxy card or voting instruction form that you received in order for all of your shares to be voted at the Annual Meeting.

Solicitation of Proxies

The cost of solicitation of proxies will be paid by the Company. Solicitation will include the preparation, assembly, printing and mailing of the Notice of Internet Availability of Proxy Materials, this Proxy Statement, the proxy and any additional solicitation of proxies from stockholders. Directors, officers and regular employees of the Company, without additional remuneration, may solicit proxies by telephone, e-mail, facsimile, personal interviews and other means. The Company anticipates out-of-pocket costs associated with proxy solicitation. The Company will also request persons, firms and corporations holding shares in their names or in the names of their nominees, which are beneficially owned by others, to send proxy materials to and obtain proxies from such beneficial owners. The Company will reimburse such holders for their reasonable expenses.

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Householding of Stockholder Materials

Some banks, brokers and other nominee record holders may be participating in the practice of “householding” proxy statements and annual reports. This means that only one copy of the Notice of Internet Availability of Proxy Materials or, as applicable, the Company’s Proxy Statement or Annual Report may be sent to multiple stockholders in the same household unless the Company has received contrary instructions from one or more of the stockholders. The Company will promptly deliver a separate copy of any document to any stockholder upon request by writing to the Company at the following address: Willdan Group, Inc., 2401 East Katella Avenue, Suite 300, Anaheim, California 92806, Attn: Secretary or upon oral request directed to the Company’s Secretary at (800) 424-9144. Any stockholder who wants to receive separate copies of the Notice of Internet Availability of Proxy Materials, the Annual Report and Proxy Statement in the future, or who is currently receiving multiple copies and would like to receive only one copy for his or her household, should contact the stockholder’s bank, broker or other nominee record holder, or contact the Company by writing to the above address or by oral request at the above telephone number. Please note that if you would like to receive a paper copy of the proxy materials for purposes of this year’s Annual Meeting, you should follow the instructions included in the Notice of Internet Availability of Proxy Materials that was sent to you.

Annual Report on Form 10-K

We will mail you, without charge, a copy of our annual report on Form 10-K for the fiscal year ended December 30, 2022, including the consolidated financial statements, schedules, and list of exhibits, upon written request. Requests should be sent to: Willdan Group, Inc., 2401 East Katella Avenue, Suite 300, Anaheim, California 92806, ATTN: Investor Relations. The annual report on Form 10-K is also available at www.willdan.com.

Stockholder Proposals

Requirements for Proposals to be Considered for Inclusion in Proxy Materials. Stockholders interested in submitting a proposal for inclusion in the proxy materials for our 2024 annual meeting of stockholders (the “2024 Annual Meeting”) may do so by following the procedures prescribed in Rule 14a-8 under the Exchange Act. To be eligible for inclusion in our proxy statement for our 2024 annual meeting, stockholder proposals must be received no later than December 28, 2023 and must comply with our Bylaws and Rule 14a-8 under the Exchange Act regarding the inclusion of stockholder proposals in company-sponsored proxy materials. If we change the date of the 2024 Annual Meeting by more than 30 days from the anniversary of this year’s meeting, stockholder proposals must be received a reasonable time before we begin to print and mail our proxy materials for the 2024 Annual Meeting.

Requirements for Proposals Not Intended for Inclusion in Proxy Materials and for Nomination of Director Candidates. Stockholders who wish to nominate persons for election to the Board at the 2024 Annual Meeting or who wish to present a proposal at the 2024 Annual Meeting, but whose stockholder proposal will not be included in the proxy materials we distribute for such meeting, must deliver written notice of the nomination or proposal to our Secretary no earlier than February 9, 2024 and no later than the close of business on March 10, 2024. If, however, the date of the 2024 Annual Meeting is more than 30 days before or more than 60 days after June 8, 2024, stockholders must submit such nominations or proposals no earlier than the close of business on the 120th day prior to the 2024 Annual Meeting, and no later than the close of business on the later of the 90th day prior to the 2024 Annual Meeting or the 10th day following the date on which public disclosure of the date of the 2024 Annual Meeting is first made by the Company. In addition, with respect to nominations for directors, if the number of directors to be elected at the 2024 Annual Meeting is increased and there is no public announcement by us naming all of the nominees for director or specifying the size of the increased Board by February 29, 2024 (100 days prior to the first anniversary of this year’s Annual Meeting), notice will also be considered timely, but only with respect to nominees for any new positions created by such increase, if it is delivered to our Secretary at our principal executive offices no later than the close of business on the 10th day following the day on which such public announcement is first made by the Company. Any proposal nominating a director candidate must also comply with the requirements under Section 3.04(a) of our Bylaws. If a stockholder’s written notice is not received between the dates specified above and does not satisfy these additional informational requirements, the notice will not be considered properly submitted and will not be acted upon at the 2024 Annual Meeting.

In addition to satisfying the foregoing requirements under our Bylaws, a stockholder who intends to solicit proxies in support of director nominees other than the Company’s nominees at the 2024 annual meeting of stockholders must deliver written notice setting forth the information required by Rule 14a-19 under the Exchange Act

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Our Bylaws also provide that a stockholder who wishes to nominate a director or propose other proper business to be brought before the stockholders at the Annual Meeting must be a stockholder of record of the Company at the time the notice is delivered to the Company’s Secretary and the stockholder must be entitled to vote at the Annual Meeting.

A stockholder notice to nominate a director or bring any other business before the 2024 Annual Meeting must set forth certain information specified in our Bylaws. Any stockholder proposal should be mailed to: Willdan Group, Inc., 2401 East Katella Avenue, Suite 300, Anaheim, California 92806, Attn: Secretary. Copies of the Charter and Bylaws may be obtained without charge by providing a written request to the Secretary of the Company at that address.

Other Matters

The Board does not know of any matter other than those described in this Proxy Statement which will be presented for action at the Annual Meeting. If other matters are presented, proxies will be voted in accordance with the discretion of the proxy holders.

REGARDLESS OF THE NUMBER OF SHARES YOU OWN, YOUR VOTE IS IMPORTANT TO THE COMPANY. PLEASE COMPLETE, SIGN, DATE AND PROMPTLY RETURN YOUR PROXY OR VOTING INSTRUCTIONS TODAY.

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APPENDIX A

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WILLDAN GROUP, INC.

AMENDED AND RESTATED 2008 PERFORMANCE INCENTIVE PLAN

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1. PURPOSE OF PLAN

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The purpose of this Willdan Group, Inc. Amended and Restated 2008 Performance Incentive Plan (this “Plan”) of Willdan Group, Inc., a Delaware corporation (the “Corporation”), is to promote the success of the Corporation and to increase stockholder value by providing an additional means through the grant of awards to attract, motivate, retain and reward selected employees and other eligible persons.

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2. ELIGIBILITY

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The Administrator (as such term is defined in Section 3.1) may grant awards under this Plan only to those persons that the Administrator determines to be Eligible Persons. An “Eligible Person” is any person who is either: (a) an officer (whether or not a director) or employee of the Corporation or one of its Subsidiaries; (b) a director of the Corporation or one of its Subsidiaries; or (c) an individual consultant or advisor who renders or has rendered bona fide services (other than services in connection with the offering or sale of securities of the Corporation or one of its Subsidiaries in a capital-raising transaction or as a market maker or promoter of securities of the Corporation or one of its Subsidiaries) to the Corporation or one of its Subsidiaries and who is selected to participate in this Plan by the Administrator; provided, however, that a person who is otherwise an Eligible Person under clause (c) above may participate in this Plan only if such participation would not adversely affect either the Corporation’s eligibility to use Form S-8 to register under the Securities Act of 1933, as amended (the “Securities Act”), the offering and sale of shares issuable under this Plan by the Corporation or the Corporation’s compliance with any other applicable laws. An Eligible Person who has been granted an award (a “participant”) may, if otherwise eligible, be granted additional awards if the Administrator shall so determine. As used herein, “Subsidiary” means any corporation or other entity a majority of whose outstanding voting stock or voting power is beneficially owned directly or indirectly by the Corporation; and “Board” means the Board of Directors of the Corporation.

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3. PLAN ADMINISTRATION

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3.1 The Administrator. This Plan shall be administered by and all awards under this Plan shall be authorized by the Administrator. The “Administrator” means the Board or one or more committees appointed by the Board or another committee (within its delegated authority) to administer all or certain aspects of this Plan. Any such committee shall be comprised solely of one or more directors or such number of directors as may be required under applicable law. A committee may delegate some or all of its authority to another committee so constituted. The Board or a committee comprised solely of directors may also delegate, to the extent permitted by Section 157(c) of the Delaware General Corporation Law and any other applicable law, to one or more officers of the Corporation, its powers under this Plan (a) to designate the officers and employees of the Corporation and its Subsidiaries who will receive grants of awards under this Plan, and (b) to determine the number of shares subject to, and the other terms and conditions of, such awards. The Board may delegate different levels of authority to different committees with administrative and grant authority under this Plan. Unless otherwise provided in the Bylaws of the Corporation or the applicable charter of any Administrator: (a) a majority of the members of the acting Administrator shall constitute a quorum, and (b) the vote of a majority of the members present assuming the presence of a quorum or the unanimous written consent of the members of the Administrator shall constitute action by the acting Administrator.

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With respect to awards intended to satisfy the requirements for performance-based compensation under Section 162(m) of the Internal Revenue Code of 1986, as amended (the “Code”), this Plan shall be administered by a committee consisting solely of two or more outside directors (as this

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requirement is applied under Section 162(m) of the Code); provided, however, that the failure to satisfy such requirement shall not affect the validity of the action of any committee otherwise duly authorized and acting in the matter. Award grants, and transactions in or involving awards, intended to be exempt under Rule 16b-3 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), must be duly and timely authorized by the Board or a committee consisting solely of two or more non-employee directors (as this requirement is applied under Rule 16b-3 promulgated under the Exchange Act). To the extent required by any applicable listing agency, this Plan shall be administered by a committee composed entirely of independent directors (within the meaning of the applicable listing agency).

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3.2 Powers of the Administrator. Subject to the express provisions of this Plan, including, without limitation, Sections 3.6 and 3.7, the Administrator is authorized and empowered to do all things necessary or desirable in connection with the authorization of awards and the administration of this Plan (in the case of a committee or delegation to one or more officers, within the authority delegated to that committee or person(s)), including, without limitation, the authority to:

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(a) determine eligibility and, from among those persons determined to be eligible, the particular Eligible Persons who will receive an award under this Plan;

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(b) grant awards to Eligible Persons, determine the price (if any) at which securities will be offered or awarded and the number of securities to be offered or awarded to any of such persons (in the case of securities-based awards), determine the other specific terms and conditions awards consistent with the express limits of this Plan, establish the installments (if any) in which such awards shall become exercisable or shall vest (which may include, without limitation, performance and/or time-based schedules), or determine that no delayed exercisability or vesting is required, establish any applicable performance targets, and establish the events of termination or reversion of such awards;

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(c) approve the forms of award agreements (which need not be identical either as to type of award or among participants);

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(d) construe and interpret this Plan and any agreements defining the rights and obligations of the Corporation, its Subsidiaries, and participants under this Plan, further define the terms used in this Plan, and prescribe, amend and rescind rules and regulations relating to the administration of this Plan or the awards granted under this Plan;

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(e) cancel, modify, or waive the Corporation’s rights with respect to, or modify, discontinue, suspend, or terminate any or all outstanding awards, subject to any required consent under Section 8.6.5;

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(f) accelerate or extend the vesting or exercisability or extend the term of any or all such outstanding awards (in the case of options or stock appreciation rights, within the maximum ten-year term of such awards) in such circumstances as the Administrator may deem appropriate (including, without limitation, in connection with a termination of employment or services or other events of a personal nature) subject to any required consent under Section 8.6.5;

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(g) adjust the number of shares of Common Stock subject to any award, adjust the price of any or all outstanding awards or otherwise change previously imposed terms and conditions, in such circumstances as the Administrator may deem appropriate, in each case subject to Sections 4 and 8.6 (and subject to the no repricing provision below);

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(h) determine the date of grant of an award, which may be a designated date after but not before the date of the Administrator’s action (unless otherwise designated by the Administrator, the date of grant of an award shall be the date upon which the Administrator took the action granting an award);

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(i) determine whether, and the extent to which, adjustments are required pursuant to Section 7 hereof and authorize the termination, conversion, substitution or succession of awards upon the occurrence of an event of the type described in Section 7;

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(j) acquire or settle (subject to Sections 7 and 8.6) rights under awards in cash, stock of equivalent value, or other consideration (subject to the no repricing provision below); and

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(k) determine the fair market value of the Common Stock or awards under this Plan from time to time and/or the manner in which such value will be determined.

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Notwithstanding the foregoing and except for an adjustment pursuant to Section 7.1 or a repricing approved by stockholders, in no case may the Administrator (1) amend an outstanding stock option or SAR to reduce the exercise price or base price of the award, (2) cancel, exchange, or surrender an outstanding stock option or SAR in exchange for cash or other awards for the purpose of repricing the award, or (3) cancel, exchange, or surrender an outstanding stock option or SAR in exchange for an option or SAR with an exercise or base price that is less than the exercise or base price of the original award.

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3.3 Binding Determinations. Any action taken by, or inaction of, the Corporation, any Subsidiary, or the Administrator relating or pursuant to this Plan and within its authority hereunder or under applicable law shall be within the absolute discretion of that entity or body and shall be conclusive and binding upon all persons. Neither the Board nor any Board committee, nor any member thereof or person acting at the direction thereof, shall be liable for any act, omission, interpretation, construction or determination made in good faith in connection with this Plan (or any award made under this Plan), and all such persons shall be entitled to indemnification and reimbursement by the Corporation in respect of any claim, loss, damage or expense (including, without limitation, attorneys’ fees) arising or resulting therefrom to the fullest extent permitted by law and/or under any directors and officers liability insurance coverage that may be in effect from time to time.

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3.4 Reliance on Experts. In making any determination or in taking or not taking any action under this Plan, the Administrator may obtain and may rely upon the advice of experts, including employees and professional advisors to the Corporation. No director, officer or agent of the Corporation or any of its Subsidiaries shall be liable for any such action or determination taken or made or omitted in good faith.

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3.5 Delegation. The Administrator may delegate ministerial, non-discretionary functions to individuals who are officers or employees of the Corporation or any of its Subsidiaries or to third parties

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3.6 Minimum Vesting Requirement. Except as provided in the next sentence, all awards granted under this Plan shall be subject to a minimum vesting requirement of one year, and no portion of any such award may vest earlier than the first anniversary of the grant date of the award (the “Minimum Vesting Requirement”). The Minimum Vesting Requirement shall not apply to 5% of the total number of shares available under this Plan.

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3.7 Dividends on Unvested Equity Awards. If the Corporation pays an ordinary cash dividend, the cash dividend shall not be paid on a current basis with respect to any awards that are not vested as of the record date for the ordinary cash dividend. Nothing in this Section 3.7 shall limit or restrict the Administrator’s ability (1) for shares of Common Stock subject to restricted stock or performance stock

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awards, to pay the amount of the ordinary cash dividend upon (and subject to) the vesting of such shares of Common Stock subject to these Awards, or (2) for stock unit awards, to credit dividend equivalents with respect to such awards in the form of additional stock units that will be subject to the same vesting terms and conditions as the underlying stock unit awards to which they relate, or (3) to make any adjustment pursuant to Section 7 of this Plan.

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4. SHARES OF COMMON STOCK SUBJECT TO THE PLAN; SHARE LIMITS

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4.1 Shares Available. Subject to the provisions of Section 7.1, the capital stock that may be delivered under this Plan shall be shares of the Corporation’s authorized but unissued Common Stock and any shares of its Common Stock held as treasury shares. For purposes of this Plan, “Common Stock” shall mean the common stock of the Corporation and such other securities or property as may become the subject of awards under this Plan, or may become subject to such awards, pursuant to an adjustment made under Section 7.1.

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4.2 Share Limits. The maximum number of shares of Common Stock that may be delivered pursuant to awards granted to Eligible Persons under this Plan (the “Share Limit”) is equal to the sum of the following:

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(1) 4,894,167 shares of Common Stock, plus

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(2) the number of shares of Common Stock subject to options granted under the Willdan Group, Inc. 2006 Stock Incentive Plan (the “2006 Plan”) and outstanding on June 9, 2008 which expire, or for any reason are cancelled or terminated, after June 9, 2008 without being exercised.

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The following limits also apply with respect to awards granted under this Plan:

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(a) The maximum number of shares of Common Stock that may be delivered pursuant to options qualified as incentive stock options granted under this Plan is 5,125,000 shares.

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(b) The maximum number of shares of Common Stock subject to those options and stock appreciation rights that are granted during any calendar year to any individual under this Plan is 300,000 shares.

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(c) Awards that are granted under this Plan during any one calendar year to any person who, on the grant date of the award, is a non-employee director are subject to the limits of this Section 4.2(c). The maximum number of shares of Common Stock subject to those awards that are granted under this Plan during any one calendar year to an individual who, on the grant date of the award, is a non-employee director is the number of shares that produce a grant date fair value for the award that, when combined with the grant date fair value of any other awards granted under this Plan during that same calendar year to that individual in his or her capacity as a non-employee director, is $200,000; provided that this limit is $400,000 as to (1) a non-employee director who is serving as the Independent Chair of the Board or the Lead Independent Director at the time the applicable grant is made or (2) any new non-employee director for the calendar year in which the non-employee director is first elected or appointed to the Board. For purposes of this Section 4.2(c), a “non-employee director” is an individual who, on the grant date of the award, is a member of the Board who is not then an officer or employee of the Corporation or one of its Subsidiaries. For purposes of this Section 4.2(c), “grant date fair value” means the value of the award as of the date of grant of the award and as determined using the equity award valuation principles applied in the Corporation’s financial reporting. The limits of this Section 4.2(c) do not apply to, and shall be determined without taking into account, any award granted to an individual who, on the

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grant date of the award, is an officer or employee of the Corporation or one of its Subsidiaries. The limits of this Section 4.2(c) apply on an individual basis and not on an aggregate basis to all non-employee directors as a group.

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Each of the foregoing numerical limits is subject to adjustment as contemplated by Section 4.3, Section 7.1, and Section 8.10.

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4.3 Awards Settled in Cash, Reissue of Awards and Shares. To the extent that an award granted under this Plan is settled in cash or a form other than shares of Common Stock, the shares that would have been delivered had there been no such cash or other settlement shall not be counted against the shares available for issuance under this Plan. In the event that shares of Common Stock are delivered in respect of a dividend equivalent right granted under this Plan, only the actual number of shares delivered with respect to the award shall be counted against the share limits of this Plan. To the extent that shares of Common Stock are delivered pursuant to the exercise of a stock appreciation right or stock option granted under this Plan, the number of underlying shares as to which the exercise related shall be counted against the applicable share limits under Section 4.2, as opposed to only counting the shares actually issued. (For purposes of clarity, if a stock appreciation right relates to 100,000 shares and is exercised at a time when the payment due to the participant is 15,000 shares, 100,000 shares shall be charged against the applicable share limits under Section 4.2 with respect to such exercise.) Except as provided in the next sentence, shares that are subject to or underlie awards granted under this Plan which expire or for any reason are cancelled or terminated, are forfeited, fail to vest, or for any other reason are not paid or delivered under this Plan shall again be available for subsequent awards under this Plan. Shares that are exchanged by a participant or withheld by the Corporation as full or partial payment in connection with any award under this Plan, as well as any shares exchanged by a participant or withheld by the Corporation or one of its Subsidiaries to satisfy the tax withholding obligations related to any award, shall not be available for subsequent awards under this Plan. Refer to Section 8.10 for application of the foregoing share limits with respect to assumed awards. The Corporation may not increase the Share Limit by repurchasing shares of Common Stock on the market (by using cash received through the exercise of stock options or otherwise.)

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4.4 Reservation of Shares; No Fractional Shares; Minimum Issue. The Corporation shall at all times reserve a number of shares of Common Stock sufficient to cover the Corporation’s obligations and contingent obligations to deliver shares with respect to awards then outstanding under this Plan (exclusive of any dividend equivalent obligations to the extent the Corporation has the right to settle such rights in cash). No fractional shares shall be delivered under this Plan. The Administrator may pay cash in lieu of any fractional shares in settlements of awards under this Plan. No fewer than 100 shares may be purchased on exercise of any award (or, in the case of stock appreciation or purchase rights, no fewer than 100 rights may be exercised at any one time) unless the total number purchased or exercised is the total number at the time available for purchase or exercise under the award.

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5. AWARDS

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5.1 Type and Form of Awards. The Administrator shall determine the type or types of award(s) to be made to each selected Eligible Person. Awards may be granted singly, in combination or in tandem. Awards also may be made in combination or in tandem with, in replacement of, as alternatives to, or as the payment form for grants or rights under any other employee or compensation plan of the Corporation or one of its Subsidiaries. The types of awards that may be granted under this Plan are (subject, in each case, to the no repricing provisions of Section 3.2):

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5.1.1 Stock Options. A stock option is the grant of a right to purchase a specified number of shares of Common Stock during a specified period as determined by the Administrator. An option may be intended as an incentive stock option within the meaning of Section 422 of the Code (an “ISO”) or a

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nonqualified stock option (an option not intended to be an ISO). The award agreement for an option will indicate if the option is intended as an ISO; otherwise it will be deemed to be a nonqualified stock option. The maximum term of each option (ISO or nonqualified) shall be ten (10) years. The per share exercise price for each option shall be not less than 100% of the fair market value of a share of Common Stock on the date of grant of the option. When an option is exercised, the exercise price for the shares to be purchased shall be paid in full in cash or such other method permitted by the Administrator consistent with Section 5.5.

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5.1.2 Additional Rules Applicable to ISOs. To the extent that the aggregate fair market value (determined at the time of grant of the applicable option) of stock with respect to which ISOs first become exercisable by a participant in any calendar year exceeds $100,000, taking into account both Common Stock subject to ISOs under this Plan and stock subject to ISOs under all other plans of the Corporation or one of its Subsidiaries (or any parent or predecessor corporation to the extent required by and within the meaning of Section 422 of the Code and the regulations promulgated thereunder), such options shall be treated as nonqualified stock options. In reducing the number of options treated as ISOs to meet the $100,000 limit, the most recently granted options shall be reduced first. To the extent a reduction of simultaneously granted options is necessary to meet the $100,000 limit, the Administrator may, in the manner and to the extent permitted by law, designate which shares of Common Stock are to be treated as shares acquired pursuant to the exercise of an ISO. ISOs may only be granted to employees of the Corporation or one of its subsidiaries (for this purpose, the term “subsidiary” is used as defined in Section 424(f) of the Code, which generally requires an unbroken chain of ownership of at least 50% of the total combined voting power of all classes of stock of each subsidiary in the chain beginning with the Corporation and ending with the subsidiary in question). There shall be imposed in any award agreement relating to ISOs such other terms and conditions as from time to time are required in order that the option be an “incentive stock option” as that term is defined in Section 422 of the Code. No ISO may be granted to any person who, at the time the option is granted, owns (or is deemed to own under Section 424(d) of the Code) shares of outstanding Common Stock possessing more than 10% of the total combined voting power of all classes of stock of the Corporation, unless the exercise price of such option is at least 110% of the fair market value of the stock subject to the option and such option by its terms is not exercisable after the expiration of five years from the date such option is granted. If an otherwise intended ISO fails to meet the applicable requirements of Section 422 of the Code, the option shall be a nonqualified stock option.

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5.1.3 Stock Appreciation Rights. A stock appreciation right or “SAR” is a right to receive a payment, in cash and/or Common Stock, equal to the excess of the fair market value of a specified number of shares of Common Stock on the date the SAR is exercised over the “base price” of the award, which base price shall be set forth in the applicable award agreement and shall be not less than 100% of the fair market value of a share of Common Stock on the date of grant of the SAR. The maximum term of a SAR shall be ten (10) years.

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5.1.4 Other Awards. The other types of awards that may be granted under this Plan include: (a) stock bonuses, restricted stock, performance stock, stock units, phantom stock, dividend equivalents, or similar rights to purchase or acquire shares, whether at a fixed or variable price (or no price) or ratio related to the Common Stock, and any of which may (but need not) be fully vested at grant or vest upon the passage of time, the occurrence of one or more events, or the satisfaction of performance criteria or other conditions, or any combination thereof; or (b) any similar awards with a value derived from the value of or related to the Common Stock and/or returns thereon and other cash awards.

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5.2 Reserved.

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5.3 Award Agreements. Each award shall be evidenced by either (1) a written award agreement in a form approved by the Administrator and executed by the Corporation by an officer duly authorized to act

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on its behalf, or (2) an electronic notice of award grant in a form approved by the Administrator and recorded by the Corporation (or its designee) in an electronic recordkeeping system used for the purpose of tracking award grants under this Plan generally (in each case, an “award agreement”), as the Administrator may provide and, in each case and if required by the Administrator, executed or otherwise electronically accepted by the recipient of the award in such form and manner as the Administrator may require. The Administrator may authorize any officer of the Corporation (other than the particular award recipient) to execute any or all award agreements on behalf of the Corporation.

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5.4 Deferrals and Settlements. Payment of awards may be in the form of cash, Common Stock, other awards or combinations thereof as the Administrator shall determine, and with such restrictions as it may impose. The Administrator may also require or permit participants to elect to defer the issuance of shares or the settlement of awards in cash under such rules and procedures as it may establish under this Plan. The Administrator may also provide that deferred settlements include the payment or crediting of interest or other earnings on the deferral amounts, or the payment or crediting of dividend equivalents where the deferred amounts are denominated in shares.

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5.5 Consideration for Common Stock or Awards. The purchase price for any award granted under this Plan or the Common Stock to be delivered pursuant to an award, as applicable, may be paid by means of any lawful consideration as determined by the Administrator, including, without limitation, one or a combination of the following methods:

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● services rendered by the recipient of such award;

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● cash, check payable to the order of the Corporation, or electronic funds transfer;

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● notice and third party payment in such manner as may be authorized by the Administrator;

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● the delivery of previously owned shares of Common Stock;

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● by a reduction in the number of shares otherwise deliverable pursuant to the award; or

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● subject to such procedures as the Administrator may adopt, pursuant to a “cashless exercise” with a third party who provides financing for the purposes of (or who otherwise facilitates) the purchase or exercise of awards.

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In no event shall any shares newly-issued by the Corporation be issued for less than the minimum lawful consideration for such shares or for consideration other than consideration permitted by applicable state law. Shares of Common Stock used to satisfy the exercise price of an option shall be valued at their fair market value on the date of exercise. The Corporation will not be obligated to deliver any shares unless and until it receives full payment of the exercise or purchase price therefor and any related withholding obligations under Section 8.5 and any other conditions to exercise or purchase have been satisfied. Unless otherwise expressly provided in the applicable award agreement, the Administrator may at any time eliminate or limit a participant’s ability to pay the purchase or exercise price of any award or shares by any method other than cash payment to the Corporation.

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5.6 Definition of Fair Market Value. For purposes of this Plan, “fair market value” shall mean, unless otherwise determined or provided by the Administrator in the circumstances, the last price (in regular trading) for a share of Common Stock as furnished by the National Association of Securities Dealers, Inc. (the “NASD”) through the Nasdaq Global Market Reporting System (the “Global Market”) for the date in question or, if no sales of Common Stock were reported by the NASD on the Global Market on that date, the last price (in regular trading) for a share of Common Stock as furnished by the NASD

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through the Global Market for the next preceding day on which sales of Common Stock were reported by the NASD. The Administrator may, however, provide with respect to one or more awards that the fair market value shall equal the last price (in regular trading) for a share of Common Stock as furnished by the NASD through the Global Market on the last trading day preceding the date in question or the average of the high and low trading prices of a share of Common Stock as furnished by the NASD through the Global Market for the date in question or the most recent trading day. If the Common Stock is no longer listed or is no longer actively traded on the Global Market as of the applicable date, the fair market value of the Common Stock shall be the value as reasonably determined by the Administrator for purposes of the award in the circumstances. The Administrator also may adopt a different methodology for determining fair market value with respect to one or more awards if a different methodology is necessary or advisable to secure any intended favorable tax, legal or other treatment for the particular award(s) (for example, and without limitation, the Administrator may provide that fair market value for purposes of one or more awards will be based on an average of closing prices (or the average of high and low daily trading prices) for a specified period preceding the relevant date).

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5.7 Transfer Restrictions.

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5.7.1 Limitations on Exercise and Transfer. Unless otherwise expressly provided in (or pursuant to) this Section 5.7 or required by applicable law: (a) all awards are non-transferable and shall not be subject in any manner to sale, transfer, anticipation, alienation, assignment, pledge, encumbrance or charge; (b) awards shall be exercised only by the participant; and (c) amounts payable or shares issuable pursuant to any award shall be delivered only to (or for the account of) the participant.

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5.7.2 Exceptions. The Administrator may permit awards to be exercised by and paid to, or otherwise transferred to, other persons or entities pursuant to such conditions and procedures, including limitations on subsequent transfers, as the Administrator may, in its sole discretion, establish in writing. Any permitted transfer shall be subject to compliance with applicable federal and state securities laws and shall not be for value (other than nominal consideration, settlement of marital property rights, or for interests in an entity in which more than 50% of the voting interests are held by the Eligible Person or by the Eligible Person’s family members).

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5.7.3 Further Exceptions to Limits on Transfer. The exercise and transfer restrictions in Section 5.7.1 shall not apply to:

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(a) transfers to the Corporation (for example, in connection with the expiration or termination of the award),

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(b) the designation of a beneficiary to receive benefits in the event of the participant’s death or, if the participant has died, transfers to or exercise by the participant’s beneficiary, or, in the absence of a validly designated beneficiary, transfers by will or the laws of descent and distribution,

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(c) subject to any applicable limitations on ISOs, transfers to a family member (or former family member) pursuant to a domestic relations order if approved or ratified by the Administrator,

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(d) if the participant has suffered a disability, permitted transfers or exercises on behalf of the participant by his or her legal representative, or

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(e) the authorization by the Administrator of “cashless exercise” procedures with third parties who provide financing for the purpose of (or who otherwise facilitate) the exercise of awards consistent with applicable laws and the express authorization of the Administrator.

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5.8 International Awards. One or more awards may be granted to Eligible Persons who provide services to the Corporation or one of its Subsidiaries outside of the United States. Any awards granted to such persons may be granted pursuant to the terms and conditions of any applicable sub-plans, if any, appended to this Plan and approved by the Administrator.

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6. EFFECT OF TERMINATION OF EMPLOYMENT OR SERVICE ON AWARDS

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6.1 General. The Administrator shall establish the effect of a termination of employment or service on the rights and benefits under each award under this Plan and in so doing may make distinctions based upon, inter alia, the cause of termination and type of award. If the participant is not an employee of the Corporation or one of its Subsidiaries and provides other services to the Corporation or one of its Subsidiaries, the Administrator shall be the sole judge for purposes of this Plan (unless a contract or the award otherwise provides) of whether the participant continues to render services to the Corporation or one of its Subsidiaries and the date, if any, upon which such services shall be deemed to have terminated.

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6.2 Events Not Deemed Terminations of Service. Unless the express policy of the Corporation or one of its Subsidiaries, or the Administrator, otherwise provides, the employment relationship shall not be considered terminated in the case of (a) sick leave, (b) military leave, or (c) any other leave of absence authorized by the Corporation or one of its Subsidiaries, or the Administrator; provided that, unless reemployment upon the expiration of such leave is guaranteed by contract or law or the Administrator otherwise provides, such leave is for a period of not more than three months. In the case of any employee of the Corporation or one of its Subsidiaries on an approved leave of absence, continued vesting of the award while on leave from the employ of the Corporation or one of its Subsidiaries may be suspended until the employee returns to service, unless the Administrator otherwise provides or applicable law otherwise requires. In no event shall an award be exercised after the expiration of the term set forth in the applicable award agreement.

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6.3 Effect of Change of Subsidiary Status. For purposes of this Plan and any award, if an entity ceases to be a Subsidiary of the Corporation a termination of employment or service shall be deemed to have occurred with respect to each Eligible Person in respect of such Subsidiary who does not continue as an Eligible Person in respect of the Corporation or another Subsidiary that continues as such after giving effect to the transaction or other event giving rise to the change in status, unless the Subsidiary that is sold, spun-off or otherwise divested (or its successor or a direct or indirect parent of such Subsidiary or successor) assumes the Eligible Person’s award(s) in connection with such transaction.

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7. ADJUSTMENTS; ACCELERATION

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7.1 Adjustments. Subject to Section 7.2, upon (or, as may be necessary to effect the adjustment, immediately prior to): any reclassification, recapitalization, stock split (including a stock split in the form of a stock dividend) or reverse stock split; any merger, combination, consolidation, or other reorganization; any spin-off, split-up, or similar extraordinary dividend distribution in respect of the Common Stock; or any exchange of Common Stock or other securities of the Corporation, or any similar, unusual or extraordinary corporate transaction in respect of the Common Stock; then the Administrator shall equitably and proportionately adjust (1) the number and type of shares of Common Stock (or other securities) that thereafter may be made the subject of awards (including the specific share limits, maximums and numbers of shares set forth elsewhere in this Plan), (2) the number, amount and type of shares of Common Stock (or other securities or property) subject to any outstanding awards, (3) the grant, purchase, or exercise price (which term includes the base price of any SAR or similar right) of any outstanding awards, and/or (4) the securities, cash or other property deliverable upon exercise or payment of any outstanding awards, in each case to the extent necessary to preserve (but not increase) the level of incentives intended by this Plan and the then-outstanding awards.

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Unless otherwise expressly provided in the applicable award agreement, upon (or, as may be necessary to effect the adjustment, immediately prior to) any event or transaction described in the preceding paragraph or a sale of all or substantially all of the business or assets of the Corporation as an entirety, the Administrator shall equitably and proportionately adjust the performance standards and/or period applicable to any then-outstanding performance-based awards to the extent necessary to preserve (but not increase) the level of incentives intended by this Plan and the then-outstanding performance-based awards.

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It is intended that, if possible, any adjustments contemplated by the preceding two paragraphs be made in a manner that satisfies applicable U.S. legal, tax (including, without limitation and as applicable in the circumstances, Section 424 of the Code, Section 409A of the Code and Section 162(m) of the Code) and accounting (so as to not trigger any charge to earnings with respect to such adjustment) requirements.

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Without limiting the generality of Section 3.3, any good faith determination by the Administrator as to whether an adjustment is required in the circumstances pursuant to this Section 7.1, and the extent and nature of any such adjustment, shall be conclusive and binding on all persons.

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7.2 Corporate Transactions - Assumption and Termination of Awards. Upon the occurrence of any of the following: any merger, combination, consolidation, or other reorganization; any exchange of Common Stock or other securities of the Corporation; a sale of all or substantially all the business, stock or assets of the Corporation; a dissolution of the Corporation; or any other event in which the Corporation does not survive (or does not survive as a public company in respect of its Common Stock); then the Administrator may make provision for a cash payment in settlement of, or for the assumption, substitution or exchange of any or all outstanding share-based awards or the cash, securities or property deliverable to the holder of any or all outstanding share-based awards, based upon, to the extent relevant under the circumstances, the distribution or consideration payable to holders of the Common Stock upon or in respect of such event. Upon the occurrence of any event described in the preceding sentence, then, unless the Administrator has made a provision for the substitution, assumption, exchange or other continuation or settlement of the award or the award would otherwise continue in accordance with its terms in the circumstances: (1) subject to Section 7.4 and unless otherwise provided in the applicable award agreement, each then-outstanding option and SAR shall become fully vested, all shares of restricted stock then outstanding shall fully vest free of restrictions, and each other award granted under this Plan that is then outstanding shall become payable to the holder of such award (with any performance goals applicable to the award in each case being deemed met, unless otherwise provided in the award agreement, at the “target” performance level); and (2) each award shall terminate upon the related event; provided that the holder of an option or SAR shall be given reasonable advance notice of the impending termination and a reasonable opportunity to exercise his or her outstanding vested options and SARs (after giving effect to any accelerated vesting required in the circumstances) in accordance with their terms before the termination of such awards (except that in no case shall more than ten days’ notice of the impending termination be required and any acceleration of vesting and any exercise of any portion of an award that is so accelerated may be made contingent upon the actual occurrence of the event).

Without limiting the preceding paragraph, in connection with any event referred to in the preceding paragraph or any change in control event defined in any applicable award agreement, the Administrator may, in its discretion, provide for the accelerated vesting of any award or awards as and to the extent determined by the Administrator in the circumstances.

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The Administrator may adopt such valuation methodologies for outstanding awards as it deems reasonable in the event of a cash or property settlement and, in the case of options, SARs or similar rights, but without limitation on other methodologies, may base such settlement solely upon the excess if any of the per share amount payable upon or in respect of such event over the exercise or base price of the award.

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In any of the events referred to in this Section 7.2, the Administrator may take such action contemplated by this Section 7.2 prior to such event (as opposed to on the occurrence of such event) to the extent that the Administrator deems the action necessary to permit the participant to realize the benefits intended to be conveyed with respect to the underlying shares. Without limiting the generality of the foregoing, the Administrator may deem an acceleration to occur immediately prior to the applicable event and/or reinstate the original terms of the award if an event giving rise to an acceleration does not occur.

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Without limiting the generality of Section 3.3, any good faith determination by the Administrator pursuant to its authority under this Section 7.2 shall be conclusive and binding on all persons.

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7.3 Other Acceleration Rules. The Administrator may override the provisions of Section 7.2 and/or 7.4 by express provision in the award agreement and may accord any Eligible Person a right to refuse any acceleration, whether pursuant to the award agreement or otherwise, in such circumstances as the Administrator may approve. The portion of any ISO accelerated in connection with an event referred to in Section 7.2 (or such other circumstances as may trigger accelerated vesting of the award) shall remain exercisable as an ISO only to the extent the applicable $100,000 limitation on ISOs is not exceeded. To the extent exceeded, the accelerated portion of the option shall be exercisable as a nonqualified stock option under the Code.

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7.4 Golden Parachute Limitation. Notwithstanding anything else contained in this Section 7 to the contrary, in no event shall any award or payment be accelerated under this Plan to an extent or in a manner so that such award or payment, together with any other compensation and benefits provided to, or for the benefit of, the participant under any other plan or agreement of the Corporation or any of its Subsidiaries, would not be fully deductible by the Corporation or one of its Subsidiaries for federal income tax purposes because of Section 280G of the Code. If a participant would be entitled to benefits or payments hereunder and under any other plan or program that would constitute “parachute payments” as defined in Section 280G of the Code, then the participant may by written notice to the Corporation designate the order in which such parachute payments will be reduced or modified so that the Corporation or one of its Subsidiaries is not denied federal income tax deductions for any “parachute payments” because of Section 280G of the Code.

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8. OTHER PROVISIONS

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8.1 Compliance with Laws. This Plan, the granting and vesting of awards under this Plan, the offer, issuance and delivery of shares of Common Stock, and/or the payment of money under this Plan or under awards are subject to compliance with all applicable federal and state laws, rules and regulations (including but not limited to state and federal securities law and federal margin requirements) and to such approvals by any listing, regulatory or governmental authority as may, in the opinion of counsel for the Corporation, be necessary or advisable in connection therewith. The person acquiring any securities under this Plan will, if requested by the Corporation or one of its Subsidiaries, provide such assurances and representations to the Corporation or one of its Subsidiaries as the Administrator may deem necessary or desirable to assure compliance with all applicable legal and accounting requirements.

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8.2 No Rights to Award. No person shall have any claim or rights to be granted an award (or additional awards, as the case may be) under this Plan, subject to any express contractual rights (set forth in a document other than this Plan) to the contrary.

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8.3 No Employment/Service Contract. Nothing contained in this Plan (or in any other documents under this Plan or in any award) shall confer upon any Eligible Person or other participant any right to continue in the employ or other service of the Corporation or one of its Subsidiaries, constitute any contract or agreement of employment or other service or affect an employee’s status as an employee

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at will, nor shall interfere in any way with the right of the Corporation or one of its Subsidiaries to change a person’s compensation or other benefits, or to terminate his or her employment or other service, with or without cause. Nothing in this Section 8.3, however, is intended to adversely affect any express independent right of such person under a separate employment or service contract other than an award agreement.

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8.4 Plan Not Funded. Awards payable under this Plan shall be payable in shares or from the general assets of the Corporation, and no special or separate reserve, fund or deposit shall be made to assure payment of such awards. No participant, beneficiary or other person shall have any right, title or interest in any fund or in any specific asset (including shares of Common Stock, except as expressly otherwise provided) of the Corporation or one of its Subsidiaries by reason of any award hereunder. Neither the provisions of this Plan (or of any related documents), nor the creation or adoption of this Plan, nor any action taken pursuant to the provisions of this Plan shall create, or be construed to create, a trust of any kind or a fiduciary relationship between the Corporation or one of its Subsidiaries and any participant, beneficiary or other person. To the extent that a participant, beneficiary or other person acquires a right to receive payment pursuant to any award hereunder, such right shall be no greater than the right of any unsecured general creditor of the Corporation.

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8.5 Tax Withholding. Upon any exercise, vesting, or payment of any award or upon the disposition of shares of Common Stock acquired pursuant to the exercise of an ISO prior to satisfaction of the holding period requirements of Section 422 of the Code or upon any other tax withholding event, the Corporation or one of its Subsidiaries shall have the right at its option to:

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(a) require the participant (or the participant’s personal representative or beneficiary, as the case may be) to pay or provide for payment of at least the minimum amount of any taxes which the Corporation or one of its Subsidiaries may be required to withhold with respect to such award event or payment; or

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(b) deduct from any amount otherwise payable in cash to the participant (or the participant’s personal representative or beneficiary, as the case may be) the minimum amount of any taxes which the Corporation or one of its Subsidiaries may be required to withhold with respect to such cash payment.

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In any case where a tax is required to be withheld in connection with the delivery of shares of Common Stock under this Plan, the Administrator may in its sole discretion (subject to Section 8.1) require or grant (either at the time of the award or thereafter) to the participant the right to elect, pursuant to such rules and subject to such conditions as the Administrator may establish, that the Corporation reduce the number of shares to be delivered by (or otherwise reacquire) the appropriate number of shares, valued in a consistent manner at their fair market value or at the sales price in accordance with authorized procedures for cashless exercises, necessary to satisfy any applicable withholding obligation on exercise, vesting or payment.

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8.6 Effective Date, Termination and Suspension, Amendments.

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8.6.1 Effective Date. This Plan was originally effective as of June 9, 2008, the Stockholder Approval Date (the “Effective Date”). This amended version of the Plan is effective as of April 17, 2023, the date this amended version of the Plan was approved by the Board (the “Amendment Date”). This Plan shall be submitted for and subject to shareholder approval no later than twelve months after the Amendment Date. Unless earlier terminated by the Board and subject to any extension that may be approved by the shareholders, this Plan shall terminate at the close of business on the day before the tenth anniversary of Amendment Date. After the termination of this Plan either upon such stated expiration date or its earlier termination by the Board, no additional awards may be granted under this Plan, but previously granted awards (and the authority of the Administrator with respect thereto,

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including the authority to amend such awards) shall remain outstanding in accordance with their applicable terms and conditions and the terms and conditions of this Plan.

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8.6.2 Board Authorization. The Board may, at any time, terminate or, from time to time, amend, modify or suspend this Plan, in whole or in part. No awards may be granted during any period that the Board suspends this Plan.

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8.6.3 Stockholder Approval. To the extent then required by applicable law or any applicable listing agency or required under Sections 422 or 424 of the Code to preserve the intended tax consequences of this Plan, or deemed necessary or advisable by the Board, any amendment to this Plan shall be subject to stockholder approval.

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8.6.4 Amendments to Awards. Without limiting any other express authority of the Administrator under (but subject to) the express limits of this Plan, the Administrator by agreement or resolution may waive conditions of or limitations on awards to participants that the Administrator in the prior exercise of its discretion has imposed, without the consent of a participant, and (subject to the requirements of Sections 3.2 and 8.6.5) may make other changes to the terms and conditions of awards. Any amendment or other action that would constitute a repricing of an award is subject to the no repricing provision set forth in Section 3.2(g).

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8.6.5 Limitations on Amendments to Plan and Awards. No amendment, suspension or termination of this Plan or amendment of any outstanding award agreement shall, without written consent of the participant, affect in any manner materially adverse to the participant any rights or benefits of the participant or obligations of the Corporation under any award granted under this Plan prior to the effective date of such change. Changes, settlements and other actions contemplated by Section 7 shall not be deemed to constitute changes or amendments for purposes of this Section 8.6.

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8.7 Privileges of Stock Ownership. Except as otherwise expressly authorized by the Administrator, a participant shall not be entitled to any privilege of stock ownership as to any shares of Common Stock not actually delivered to and held of record by the participant. Except as expressly required by Section 7.1 or otherwise expressly provided by the Administrator, no adjustment will be made for dividends or other rights as a stockholder for which a record date is prior to such date of delivery.

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8.8 Governing Law; Construction; Severability.

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8.8.1 Choice of Law. This Plan, the awards, all documents evidencing awards and all other related documents shall be governed by, and construed in accordance with the laws of the State of Delaware.

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8.8.2 Severability. If a court of competent jurisdiction holds any provision invalid and unenforceable, the remaining provisions of this Plan shall continue in effect.

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8.8.3 Plan Construction.

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It is the intent of the Corporation that the awards and transactions permitted by awards be interpreted in a manner that, in the case of participants who are or may be subject to Section 16 of the Exchange Act, qualify, to the maximum extent compatible with the express terms of the award, for exemption from matching liability under Rule 16b-3 promulgated under the Exchange Act. Notwithstanding the foregoing, the Corporation shall have no liability to any participant for Section 16 consequences of awards or events under awards if an award or event does not so qualify.

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8.9 Captions. Captions and headings are given to the sections and subsections of this Plan solely as a convenience to facilitate reference. Such headings shall not be deemed in any way material or relevant to the construction or interpretation of this Plan or any provision thereof.

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8.10 Stock-Based Awards in Substitution for Stock Options or Awards Granted by Other Corporation. Awards may be granted to Eligible Persons in substitution for or in connection with an assumption of employee stock options, SARs, restricted stock or other stock-based awards granted by other entities to persons who are or who will become Eligible Persons in respect of the Corporation or one of its Subsidiaries, in connection with a distribution, merger or other reorganization by or with the granting entity or an affiliated entity, or the acquisition by the Corporation or one of its Subsidiaries, directly or indirectly, of all or a substantial part of the stock or assets of the employing entity. The awards so granted need not comply with other specific terms of this Plan, provided the awards reflect adjustments giving effect to the assumption or substitution consistent with the conversion applicable to the Common Stock in the transaction and any change in the issuer of the security. Any shares that are delivered and any awards that are granted by, or become obligations of, the Corporation, as a result of the assumption by the Corporation of, or in substitution for, outstanding awards previously granted by an acquired company (or previously granted by a predecessor employer (or direct or indirect parent thereof) in the case of persons that become employed by the Corporation or one of its Subsidiaries in connection with a business or asset acquisition or similar transaction) shall not be counted against the Share Limit or other limits on the number of shares available for issuance under this Plan.

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8.11 Non-Exclusivity of Plan. Nothing in this Plan shall limit or be deemed to limit the authority of the Board or the Administrator to grant awards or authorize any other compensation, with or without reference to the Common Stock, under any other plan or authority.

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8.12 No Corporate Action Restriction. The existence of this Plan, the award agreements and the awards granted hereunder shall not limit, affect or restrict in any way the right or power of the Board or the stockholders of the Corporation to make or authorize: (a) any adjustment, recapitalization, reorganization or other change in the capital structure or business of the Corporation or any Subsidiary, (b) any merger, amalgamation, consolidation or change in the ownership of the Corporation or any Subsidiary, (c) any issue of bonds, debentures, capital, preferred or prior preference stock ahead of or affecting the capital stock (or the rights thereof) of the Corporation or any Subsidiary, (d) any dissolution or liquidation of the Corporation or any Subsidiary, (e) any sale or transfer of all or any part of the assets or business of the Corporation or any Subsidiary, or (f) any other corporate act or proceeding by the Corporation or any Subsidiary. No participant, beneficiary or any other person shall have any claim under any award or award agreement against any member of the Board or the Administrator, or the Corporation or any employees, officers or agents of the Corporation or any Subsidiary, as a result of any such action.

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8.13 Other Company Benefit and Compensation Programs. Payments and other benefits received by a participant under an award made pursuant to this Plan shall not be deemed a part of a participant’s compensation for purposes of the determination of benefits under any other employee welfare or benefit plans or arrangements, if any, provided by the Corporation or any Subsidiary, except where the Administrator expressly otherwise provides or authorizes in writing. Awards under this Plan may be made in addition to, in combination with, as alternatives to or in payment of grants, awards or commitments under any other plans or arrangements of the Corporation or its Subsidiaries.

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8.14 Administrator Discretion. Notwithstanding Section 3.6, the Minimum Vesting Requirement shall not limit or restrict the Administrator’s discretion to accelerate the vesting of any award in circumstances it determines to be appropriate (whether in connection with a transaction, termination of employment or for any other reason).

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8.15 Clawback Policy. The awards granted under this Plan are subject to the terms of the Corporation’s recoupment, clawback or similar policy as it may be in effect from time to time, as well as any similar provisions of applicable law, any of which could in certain circumstances require repayment or forfeiture of awards or any shares of Common Stock or other cash or property received with respect to the awards (including any value received from a disposition of the shares acquired upon payment of the awards).

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APPENDIX B

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WILLDAN GROUP, INC.

AMENDED AND RESTATED

2006 EMPLOYEE STOCK PURCHASE PLAN

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1. PURPOSE. The purpose of this Willdan Group, Inc. Amended and Restated 2006 Employee Stock Purchase Plan (the “Plan”) is to encourage stock ownership by eligible employees of Willdan Group, Inc. (the “Company”) and its Participating Subsidiaries, and to provide them with an incentive to contribute to the profitability and success of the Company. The Plan is intended to qualify as an “employee stock purchase plan” under Section 423 of the Code and will be maintained for the exclusive benefit of eligible employees of the Company and its Participating Subsidiaries.

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2. DEFINITIONS. For purposes of the Plan, in addition to the terms defined in Section 1, the following terms are defined:

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(a) “Board” means the Board of Directors of the Company.

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(b) “Book Account” means the book entry account maintained on behalf of each Participant by the Company (or a recordkeeper designated by the Company) for the purpose of accounting for the cash contributions withheld from payroll pending an investment in Stock.

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(c) “Code” means the Internal Revenue Code of 1986, as amended.

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(d) “Earnings” means a Participant’s salary or wages, including overtime (but excluding bonuses) for services performed for the Company and its Participating Subsidiaries and received by a Participant for services rendered during an Offering Period.

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(e) “Fair Market Value” means the closing price of the Stock on the relevant date as reported on the Nasdaq Global Market (or any national securities exchange or quotation system on which the Stock is then listed), or if there were no sales on that date the closing price on the next preceding date for which a closing price was reported.

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(f) “Offering Period” means the six-month period beginning on each January 1 and ending each June 30 and the six-month period beginning on each July 1 and ending on each December 31; provided, however, that the Board may declare, as it deems appropriate and in advance of the applicable Offering Period, a shorter (not to be less than three months) Offering Period or a longer (not to exceed 27 months) Offering Period.

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(g) “Parent” means any parent corporation as defined in Code Section 424(e).

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(h) “Participant” means an employee of the Company or a Participating Subsidiary who is participating in the Plan.

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(i) “Participating Subsidiary” means any Subsidiary whose employees are designated as being eligible to participate in the Plan.

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(j) “Purchase Right” means a Participant’s option to purchase Stock that is deemed to be outstanding during a Offering Period. A Purchase Right represents an “option” under Section 423 of the Code.

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(k) “Stock” means the common stock of the Company.

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(l) “Subsidiary” means any subsidiary corporation as defined in Code Section 424(f).

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3. ADMINISTRATION.

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(a) BOARD ADMINISTRATION. The Plan will be administered by the Board. The Board may delegate its administrative duties and authority (other than its authority to amend or terminate the Plan) to any Board committee or to any officers or employees or committee thereof as the Board may designate (in which case references to the Board will be deemed to refer to the administrator to which such duties and authority have been delegated). The Board will have full authority to adopt, amend, suspend, waive, and rescind rules and regulations and appoint agents as it deems necessary or advisable to administer the Plan, to correct any defect or supply any omission or reconcile any inconsistency in the Plan and to construe and interpret the Plan and rules and regulations thereunder, and to make all other decisions and determinations under the Plan (including determinations relating to eligibility). No person acting in connection with the administration of the Plan will, in that capacity, participate in deciding any matter relating to his or her participation in the Plan.

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(b) WAIVERS. Subject to the requirements of Section 423 of the Code, the Board may waive or modify any requirement that a notice or election be made or filed under the Plan a specified period in advance by adopting a rule or regulation under the Plan, without amending the Plan.

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(c) OTHER ADMINISTRATIVE PROVISIONS. The Company will furnish information from its records as directed by the Board, and such records, including a Participant’s Earnings, will be conclusive on all persons unless determined by the Board to be incorrect. Each Participant and other person claiming benefits under the Plan must furnish to the Company in writing a current mailing address and any other information as the Board may reasonably request. Any communication, statement, or notice mailed with postage prepaid to any such Participant or other person at the last mailing address filed with the Company will be deemed sufficiently given when mailed and will be binding upon the named recipient. The Plan will be administered on a reasonable and nondiscriminatory basis and uniform rules will be applied. All Participants will have equal rights and privileges (subject to the terms of the Plan) with respect to Purchase Right outstanding during any given Offering Period in accordance with Code Section 423(b)(5).

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4. STOCK SUBJECT TO PLAN. Subject to adjustment as provided in Section 8(a), the total number of shares of Stock reserved and available for issuance or which may be otherwise acquired upon exercise of Purchase Rights under the Plan will be 1,925,000. Any shares of Stock delivered by the Company under the Plan may consist, in whole or in part, of authorized and unissued shares or treasury shares. If, at the end of any Offering Period, the number of shares of Stock with respect to which Purchase Rights are to be exercised exceeds the number of shares of Stock then available under the Plan, the Board shall make a pro rata allocation of the shares of Stock remaining available for purchase in as uniform a manner as shall be practicable and as it shall determine to be equitable. Shares of Stock that are subject to or underlie Purchase Rights, which for any reason are cancelled or terminated, are forfeited, fail to vest, or for any other reason are not paid or delivered under this Plan shall again, except to the extent prohibited by law, be available for subsequent Purchase Rights under this Plan.

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5. ENROLLMENT AND CONTRIBUTIONS.

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(a) ELIGIBILITY. An employee of the Company or any Participating Subsidiary may be enrolled in the Plan for any Offering Period if such employee is employed by the Company or a Participating Subsidiary authorized to participate in the Plan on the first day of the Offering Period, unless one of the following applies to the employee:

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(i) such person is customarily employed by the Company or a Participating Subsidiary for 20 hours or less a week; or

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(ii) such person is customarily employed by the Company or a Participating Subsidiary for not more than five months in any calendar year.

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The Company will notify an employee of the date as of which he or she is eligible to enroll in the Plan, and will make available to each eligible employee the necessary enrollment forms.

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(b) INITIAL ENROLLMENT. An employee who is eligible under Section 5(a) (or who will become eligible on or before a given Offering Period) may, after receiving current information about the Plan, initially enroll in the Plan by executing and filing with the Company a properly completed enrollment form, including the employee’s election as to the rate of payroll contributions for the Offering Period. To be effective for any Offering Period, such properly executed enrollment form must be filed with the Company at such time prior to such Offering Period as may be determined by the Board.

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(c) AUTOMATIC RE-ENROLLMENT FOR SUBSEQUENT OFFERING PERIODS. A Participant whose enrollment in, and payroll contributions under, the Plan continues throughout an Offering Period will automatically be re-enrolled in the Plan for the next Offering Period unless (i) the Participant terminates enrollment before the next Offering Period in accordance with Section 7(a), (ii) the Participant is ineligible to participate under Section 5(a), or (iii) the Board requires that a new enrollment form be executed and filed with the Company. The initial rate of payroll contributions for a Participant who is automatically re-enrolled for an Offering Period will be the same as the rate of payroll contribution in effect at the end of the preceding Offering Period, unless the Participant files a new properly executed enrollment form designating a different rate of payroll contributions and such new enrollment form is filed with the Company at such time prior to the beginning of the next Offering Period as may be determined by the Board.

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(d) PAYROLL CONTRIBUTIONS. A Participant will make contributions under the Plan only by means of payroll deductions from Earnings for each payroll period that is paid during the Offering Period, at the rate elected by the Participant in his or her enrollment form in effect for that Offering Period (except that such rate may be changed during the Offering Period to the extent permitted below). The rate of payroll contributions elected by a Participant may not be less than one percent (1%) nor more than ten percent (10%) of the Participant’s Earnings for each payroll period, and only whole percentages may be elected; provided, however, that the Board may specify a lower minimum rate and higher maximum rate prior to the start of the applicable Offering Period, subject to Section 9(b). Notwithstanding the above, a Participant’s payroll contributions will be adjusted downward by the Company as necessary to ensure that the limit on the amount of Stock purchased for an Offering Period set forth in Section 6(a)(iii) is not exceeded. A Participant may elect to increase, decrease, or discontinue payroll contributions for a future Offering Period by filing a new enrollment form designating a different rate of payroll contributions, which properly executed form must be filed with the Company at such time prior to the beginning of an Offering Period as may be determined by the Board to be effective for that Offering Period. In addition, a Participant may elect to discontinue payroll contributions during an Offering Period by filing a new properly executed enrollment form, such change to be effective for the next payroll after the Participant’s new enrollment form is filed with the Company.

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(e) CREDITING PAYROLL CONTRIBUTIONS TO BOOK ACCOUNTS. All payroll contributions by a Participant under the Plan will be credited to a Book Account maintained by the Company on behalf of such Participant. The Company will credit payroll contributions by a Participant to such Book Account as soon as practicable after the contributions are withheld from such Participant’s Earnings.

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(f) NO INTEREST ON BOOK ACCOUNTS. No interest will be credited or paid on cash balances in the Book Accounts pending investment in Stock.

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6. PURCHASES OF STOCK.

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(a) PURCHASE RIGHTS. Enrollment in the Plan for any Offering Period by a Participant will constitute a grant by the Company of a Purchase Right to such Participant for such Offering Period as long as the participant remains eligible pursuant to Section 5(a) hereof. Each Purchase Right will be subject to the following terms:

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(i) The purchase price of each share of Stock purchased for each Offering Period will equal the lesser of: (i) 85% of the Fair Market Value of a share of Stock on the first day of the Offering Period and (ii) 85% of the Fair Market Value of a share of Stock on the last day of that Offering Period; provided, however, that the Board may provide prior to the start of any Offering Period that the purchase price for each share of Stock for that Offering Period shall be determined by applying a discount

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amount (not to exceed 15%) to either (1) the Fair Market Value of a share of Stock on the first day of the Offering Period, or (2) the Fair Market Value of a share of Stock on the last day of that Offering Period, or (3) the lesser of the Fair Market Value of a share of Stock on the first day of the Offering Period or the Fair Market Value of a share of Stock on the last day of that Offering Period.

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(ii) The number of shares of Stock that may be purchased upon exercise of the Purchase Right for a Offering Period will equal the number of shares that can be purchased at the purchase price specified in Section 6(a)(i) with the aggregate amount credited to the Participant’s Book Account as of the last day of an Offering Period.

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(iii) Notwithstanding the foregoing, the maximum number of shares of Stock that any one individual may acquire upon exercise of his or her Purchase Right with respect to any one Offering Period is 10,000, subject to adjustments pursuant to Section 8(a) (the “Individual Limit”). The Board may amend the Individual Limit, effective no earlier than the first Offering Period commencing after the adoption of such amendment, without stockholder approval.

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(iv) Subject to Section 7, the Purchase Right will be automatically exercised on the last day of the Offering Period.

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(v) Payments by a Participant for Stock purchased under a Purchase Right will be made only through payroll deduction in accordance with Section 5(d) and (e).

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(vi) The Purchase Right will expire on the earlier of the last day of the Offering Period or the date on which the Participant’s enrollment in the Plan terminates.

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(b) LIMITS ON SHARE PURCHASES. Notwithstanding anything else contained herein, any person who is otherwise an eligible to participate in this Plan shall not be granted any Purchase Right (or any Purchase Right granted such person shall be subject to compliance with the following limitations) or other right to purchase shares under this Plan to the extent:

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(i) it would, if exercised, cause the person to own stock (within the meaning of Section 423(b)(3) of the Code) possessing 5% or more of the total combined voting power or value of all classes of stock of the Company, or of any Parent, or of any Subsidiary; or

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(ii) such Purchase Right causes such individual to have rights to purchase stock under this Plan and any other plan of the Company, any Parent, or any Subsidiary which is qualified under Section 423 of the Code which accrue at a rate which exceeds $25,000 of the fair market value of the stock of the Company, of any Parent, or of any Subsidiary (determined at the time the right to purchase such stock is granted, before giving effect to any discounted purchase price under any such plan) for each calendar year in which such right is outstanding at any time.

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For purposes of the foregoing, a right to purchase stock accrues when it first become exercisable during the calendar year. In determining whether the stock ownership of any employee equals or exceeds the 5% limit set forth above, the rules of Section 424(d) of the Code (relating to attribution of stock ownership) shall apply, and stock which the employee may purchase under outstanding purchase rights shall be treated as stock owned by the employee.

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(c) PURCHASE OF STOCK. At or as promptly as practicable after the last day of an Offering Period, amounts credited to each Participant’s Book Account will be applied by the Company to purchase Stock, in accordance with the terms of the Plan. Shares of Stock will be purchased from the Company. The Company will aggregate the amounts in all Book Accounts when purchasing Stock, and shares purchased will be allocated to each Participant in

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proportion to the balance allocated from each Participant’s Book Account. As soon as administratively practicable after the last day of the Offering Period, the Company shall, in its discretion, either deliver to each Participant a certificate representing the shares of Stock purchased upon exercise of his or her Purchase Right, provide for the crediting of such shares in book entry form in the name of the Participant, or provide for an alternative arrangement for the delivery of such shares to a broker or recordkeeping service for the benefit of the Participant.

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(d) EXCESS ACCOUNT BALANCES. If any amounts remain in a Book Account following the date on which the Company purchases Stock for an Offering Period for any reason, such amounts will be returned to the Participant as promptly as practicable.

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7. TERMINATION AND DISTRIBUTIONS.

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(a) TERMINATION OF ENROLLMENT. A Participant’s enrollment in the Plan will terminate upon (i) the beginning of any payroll period or Offering Period that begins after he or she files a written notice of termination of enrollment with the Company, provided that such Participant will continue to be deemed to be enrolled with respect to any completed Offering Period for which purchases have not been completed, (ii) such time as the Participant becomes ineligible to participate under Section 5(a) of the Plan, or (iii) the termination of the Participant’s employment by the Company and its Subsidiaries. An employee whose enrollment in the Plan terminates may again enroll in the Plan as of any subsequent Offering Period if he or she satisfies the eligibility requirements of Section 5(a) as of such Offering Period. A Participant’s election to discontinue payroll contributions will not constitute a termination of enrollment.

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(b) DISTRIBUTION. As soon as practicable after a Participant’s enrollment in the Plan terminates, amounts in the Participant’s Book Account which resulted from payroll contributions will be repaid to the Participant. If a Participant’s termination of enrollment results from his or her death, all amounts payable will be paid to his or her designated beneficiary or beneficiaries and if no such designation is made, to his or her estate.

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8. ADJUSTMENTS; POSSIBLE EARLY TERMINATION OF PURCHASE RIGHTS

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(a) ADJUSTMENTS. Upon or in contemplation of any reclassification, recapitalization, stock split (including a stock split in the form of a stock dividend), or reverse stock split; any merger, combination, consolidation, or other reorganization; split-up, spin-off, or any similar extraordinary dividend distribution in respect of the Stock (whether in the form of securities or property); any exchange of Stock or other securities of the Company, or any similar, unusual or extraordinary corporate transaction in respect of the Stock; or a sale of substantially all the assets of the Company as an entirety occurs; then the Board shall equitably and proportionately adjust (1) the number and type of shares or the number and type of other securities that thereafter may be made the subject of Purchase Rights (including the specific maxima and numbers of shares set forth elsewhere in this Plan), (2) the number, amount and type of shares (or other securities or property) subject to any or all outstanding Purchase Rights, (3) the purchase price of any or all outstanding Purchaser Rights, and/or (4) the securities, cash or other property deliverable upon exercise of any outstanding Purchase Rights, in each case to the extent necessary to preserve (but not increase) the level of incentives intended by this Plan and the then-outstanding Purchase Rights.

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Upon the occurrence of any event described in the preceding paragraph, or any other event in which the Company does not survive (or does not survive as a public company in respect of its Stock); then the Board may make provision for a cash payment or for the substitution or exchange of any or all outstanding Purchase Rights for cash, securities or property to be delivered to the holders of any or all outstanding Purchase Rights based upon the distribution or consideration payable to holders of the Stock upon or in respect of such event.

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The Board may adopt such valuation methodologies for outstanding Purchase Rights as it deems reasonable in the event of a cash or property settlement and, without limitation on other methodologies, may base such settlement solely upon the excess (if any) of the amount payable upon or in respect of such event over the purchase price of the Purchase Right.

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In any of such events, the Board may take such action sufficiently prior to such event to the extent that the Board deems the action necessary to permit the Participant to realize the benefits intended to be conveyed with respect to the underlying shares in the same manner as is or will be available to stockholders generally.

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(b) POSSIBLE EARLY TERMINATION OF PLAN AND PURCHASE RIGHTS. Upon a dissolution or liquidation of the Company, or any other event described in Section 8(a) that the Company does not survive or does not survive as a publicly-traded company in respect of its Stock, as the case may be, and the Board does not make provision for a cash payment or for the substitution or exchange of outstanding Purchase Rights in accordance with Section 8(a), then any Offering Period then in progress shall be shortened and the last day of the Offering Period shall be established by the Board (the “New Purchase Date”), as of which date the Plan and any Offering Period then in progress will terminate. The New Purchase Date shall be on or before the date of the consummation of the transaction and the Board shall notify each Participant in writing at least ten (10) days prior to the New Purchase Date that the last day of the Offering Period for his or her outstanding Purchase Right has been changed to the New Purchase Date and that his or her Purchase Right will be exercised automatically on the New Purchase Date, unless prior to such date he or she has withdrawn from the Offering Period in accordance with Section 7. The purchase price on the New Purchase Date shall be determined as provided in Section 6(a), and, if applicable, the New Purchase Date shall be treated as the last day of the offering period for purposes of determining such purchase price.

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9. GENERAL PROVISIONS.

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(a) COSTS. Costs and expenses incurred in the administration of the Plan and maintenance of Book Accounts will be paid by the Company, to the extent provided in this Section 9(a). Any brokerage fees and commissions for the purchase of Stock under the Plan will be paid by the Company, but any brokerage fees and commissions for the sale of Stock by a Participant will be borne by such Participant.

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(b) COMPLIANCE WITH SECTION 423. It is the intent of the Company that this Plan comply in all respects with applicable requirements of Section 423 of the Code and regulations thereunder. Accordingly, if any provision of this Plan does not comply with such requirements, such provision will be construed or deemed amended to the extent necessary to conform to such requirements.

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(c) COMPLIANCE WITH LEGAL AND OTHER REQUIREMENTS. The Plan, the granting and exercising of Purchase Rights hereunder, and the other obligations of the Company under the Plan will be subject to all applicable federal and state laws, rules, and regulations, and to such approvals by any regulatory or governmental agency as may be required. The Company may, in its discretion, postpone the issuance or delivery of Stock upon exercise of Purchase Rights until completion of such registration or qualification of such Stock or other required action under any federal or state law, rule, or regulation, or the laws of any country in which employees of the Company and a Participating Subsidiary who are nonresident aliens and who are eligible to participate reside, or other required action with respect to any automated quotation system or stock exchange upon which the Stock or other Company securities are designated or listed, or compliance with any other contractual obligation of the Company, as the Company may consider appropriate. In addition, the Company may require any Participant to make such representations and furnish such information as it may consider appropriate in connection with the issuance or delivery of Stock in compliance with applicable laws, rules, and regulations, designation or listing requirements, or other contractual obligations.

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(d) LIMITS ON ENCUMBERING RIGHTS. No right or interest of a Participant under the Plan, including any Purchase Right, may be pledged, encumbered, or hypothecated to or in favor of any party, subject to any lien, obligation, or liability of such Participant, or otherwise assigned, transferred, or disposed of except pursuant to the laws of descent or distribution, and any right of a Participant under the Plan will be exercisable during the Participant’s lifetime only by the Participant.

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(e) NO RIGHT TO CONTINUED EMPLOYMENT. Neither the Plan nor any action taken hereunder, including the grant of a Purchase Right, will be construed as giving any employee the right to be retained in the employ of the Company or any of its Subsidiaries, nor will it interfere in any way with the right of the Company or any of its Subsidiaries to terminate any employee’s employment at any time.

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(f) TAXES. The Company or any Subsidiary is authorized to withhold from any payment to be made to a Participant, including any payroll and other payments not related to the Plan, amounts of withholding and other taxes due in connection with any transaction under the Plan, and a Participant’s enrollment in the Plan will be deemed to constitute his or her consent to such withholding. In addition, Participants may be required to advise the Company of sales and other dispositions of Stock acquired under the plan in order to permit the Company to comply with tax laws and to claim any tax deductions to which the Company may be entitled with respect to the Plan. This provision and other Plan provisions do not set forth an explanation of the tax consequences to Participants under the Plan. A brief summary of the tax consequences will be included in disclosure documents to be separately furnished to Participants.

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(g) CHANGES TO THE PLAN. The Board may amend, alter, suspend, discontinue, or terminate the Plan without the consent of stockholders or Participants, except that any such action will be subject to the approval of the Company’s stockholders within one year after such Board action if such stockholder approval is required by any federal or state law or regulation or the rules of any automated quotation system or stock exchange on which the Stock may then be quoted or listed, or if such stockholder approval is necessary in order for the Plan to continue to meet the requirements of Section 423 of the Code, and the Board may otherwise, in its discretion, determine to submit other such actions to stockholders for approval. However, without the consent of an affected Participant, no amendment, alteration, suspension, discontinuation, or termination of the Plan may materially and adversely affect the rights of such Participant with respect to outstanding Purchase Rights relating to any Offering Period that has been completed prior to such Board action. Changes contemplated by Section 8(a) or 8(b) shall not be deemed to constitute changes or amendments requiring Participant consent. The foregoing notwithstanding, upon termination of the Plan the Board may (i) elect to terminate all outstanding Purchase Rights at such time as the Board may designate, and all amounts contributed to the Plan which are reflected in a Participant’s Book Account will be returned to the Participant (without interest) as promptly as practicable, or (ii) shorten the Offering Period to such period determined by the Board and use amounts credited to a Participant Book Account to purchase Stock.

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(h) NO RIGHTS TO PARTICIPATE; NO STOCKHOLDER RIGHTS. No Participant or employee will have any claim to participate in the Plan with respect to Offering Periods that have not commenced, and the Company will have no obligation to continue the Plan. No Purchase Right will confer on any Participant any of the rights of a stockholder of the Company unless and until Stock is duly issued or transferred and delivered to the Participant.

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(i) NO FRACTIONAL SHARES. Unless otherwise determined by the Board, purchases of Stock under the Plan shall not result in the issuance of fractional shares of Stock to a Participant. Any amounts in a Participant's Book Account after the purchase of whole shares of Stock shall be paid to such Participant as soon as practicable following the end of the Offering Period.

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(j) GOVERNING LAW. The validity, construction, and effect of the Plan and any rules and regulations relating to the Plan will be determined in accordance with the laws of the State of Delaware, without giving effect to principles of conflicts of laws, and applicable federal law.

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(k) EFFECTIVE DATE. The Plan originally became effective on February 10, 2007, subject to the Plan being approved by stockholders of the Company by a vote sufficient to meet the requirements of Section 423(b)(2) of the Code. This Amended and Restated version of the Plan is effective April 17, 2023, subject to the Amended and Restated version of the Plan being approved by stockholders of the Company by a vote sufficient to meet the requirements of Section 423(b)(2) of the Code.

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APPENDIX C

Use of Non-GAAP Financial Measures

“Adjusted EBITDA,” defined as net income plus interest expense, income tax expense, stock-based compensation, interest accretion, depreciation and amortization, transaction costs, gain on sale of equipment, and tax benefit distribution, is a non-GAAP financial measure. Adjusted EBITDA is a supplemental measure used by Willdan’s management to measure Willdan’s operating performance. Willdan believes Adjusted EBITDA is useful because it allows Willdan’s management to evaluate its operating performance and compare the results of its operations from period to period and against its peers without regard to its financing methods, capital structure and non-operating expenses. Willdan uses Adjusted EBITDA to evaluate its performance for, among other things, budgeting, forecasting and incentive compensation purposes.

Certain items excluded from Adjusted EBITDA are significant components in understanding and assessing a company’s financial performance, such as a company’s costs of capital and stock-based compensation, as well as the historical costs of depreciable assets. A reconciliation of net income as reported in accordance with GAAP to Adjusted EBITDA is provided below.

“Adjusted Net Income,” defined as net income plus stock-based compensation, intangible amortization, interest accretion, transaction costs, deferred tax valuation, and tax benefit distribution, each net of tax, is a non-GAAP financial measure.

“Adjusted Diluted EPS,” defined as net income plus stock-based compensation, intangible amortization, interest accretion, transaction costs, deferred tax valuation, and tax benefit distribution, each net of tax, all divided by the diluted weighted-average shares outstanding, is a non-GAAP financial measure. Adjusted Net Income and Adjusted Diluted EPS are supplemental measures used by Willdan’s management to measure its operating performance. Willdan believes Adjusted Net Income and Adjusted Diluted EPS are useful because they allow Willdan’s management to more closely evaluate and explain the operating results of Willdan’s business by removing certain non-operating expenses. Reconciliations of net income as reported in accordance with GAAP to Adjusted Net Income and diluted EPS as reported in accordance with GAAP to Adjusted Diluted EPS are provided below.

Willdan’s definitions of Adjusted EBITDA, Adjusted Net Income and Adjusted Diluted EPS have limitations as analytical tools and may differ from other companies reporting similarly named measures or from similarly named measures Willdan has reported in prior periods. These measures should be considered in addition to, and not as a substitute for, or superior to, other measures of financial performance prepared in accordance with GAAP, such as contract revenue, net income and diluted EPS.

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Willdan Group, Inc. and Subsidiaries

Reconciliation of GAAP Net Income to Adjusted EBITDA

(in thousands)

(Non-GAAP Measure)

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​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended
​ | ​ | December 30, |  | December 31,
​ |  | 2022 | ​ | 2021
Net income (loss) |  | $ | (8,448) | ​ | $ | (8,417)
Interest expense | ​ | ​ | 5,328 | ​ | ​ | 3,869
Income tax expense (benefit) | ​ | ​ | (3,004) | ​ | ​ | (3,987)
Stock-based compensation | ​ | ​ | 8,373 | ​ | ​ | 16,563
Interest accretion (1) | ​ | ​ | 3,168 | ​ | ​ | 2,333
Depreciation and amortization | ​ | ​ | 17,489 | ​ | ​ | 17,146
Transaction costs (2) | ​ | ​ | — | ​ | ​ | 43
(Gain) Loss on sale of equipment | ​ | ​ | (64) | ​ | ​ | (24)
Tax benefit distribution | ​ | ​ | 434 | ​ | ​ | —
Adjusted EBITDA | ​ | $ | 23,276 | ​ | $ | 27,526

(1) Interest accretion represents the imputed interest and fair value adjustments to estimated contingent consideration.

(2) Transaction costs represents acquisition and acquisition related costs.

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Willdan Group, Inc. and Subsidiaries

Reconciliation of GAAP Net Income to Adjusted Net Income and Adjusted Diluted EPS

(in thousands, except per share amounts)

(Non-GAAP Measure)

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​ | ​ | Year Ended
​ | ​ | December 30, |  | December 31,
​ |  | 2022 | ​ | 2021
Net income (loss) |  | $ | (8,448) | ​ | $ | (8,417)
Adjustment for stock-based compensation | ​ | ​ | 8,373 | ​ | ​ | 16,563
Tax effect of stock-based compensation | ​ | ​ | (1,194) | ​ | ​ | (2,079)
Adjustment for intangible amortization | ​ | ​ | 11,228 | ​ | ​ | 11,543
Tax effect of intangible amortization | ​ | ​ | (1,601) | ​ | ​ | (1,449)
Adjustment for interest accretion | ​ | ​ | 3,168 | ​ | ​ | 2,333
Tax effect of interest accretion | ​ | ​ | (452) | ​ | ​ | (293)
Adjustment for transaction costs | ​ | ​ | — | ​ | ​ | 43
Tax effect of transaction costs | ​ | ​ | — | ​ | ​ | (5)
Adjustment for deferred tax valuation | ​ | ​ | — | ​ | ​ | 1,105
Tax effect of deferred tax valuation | ​ | ​ | — | ​ | ​ | —
Adjustment for tax benefit distribution | ​ | ​ | 434 | ​ | ​ | —
Tax effect of tax benefit distribution | ​ | ​ | (62) | ​ | ​ | —
Adjusted Net Income (Loss) | ​ | $ | 11,446 | ​ | $ | 19,344
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Diluted weighted-average shares outstanding | ​ | ​ | 13,013 | ​ | ​ | 12,458
​ | ​ | ​ | ​ | ​ | ​ | ​
Diluted earnings (loss) per share | ​ | $ | (0.65) | ​ | $ | (0.68)
Impact of adjustment: | ​ | ​ | ​ | ​ | ​ | ​
Stock-based compensation per share | ​ | ​ | 0.64 | ​ | ​ | 1.33
Tax effect of stock-based compensation per share | ​ | ​ | (0.09) | ​ | ​ | (0.17)
Intangible amortization per share | ​ | ​ | 0.86 | ​ | ​ | 0.93
Tax effect of intangible amortization per share | ​ | ​ | (0.12) | ​ | ​ | (0.12)
Interest accretion per share | ​ | ​ | 0.24 | ​ | ​ | 0.19
Tax effect of interest accretion per share | ​ | ​ | (0.03) | ​ | ​ | (0.02)
Transaction costs per share | ​ | ​ | — | ​ | ​ | 0.00
Tax effect of transaction costs per share | ​ | ​ | — | ​ | ​ | (0.00)
Deferred tax valuation per share | ​ | ​ | — | ​ | ​ | 0.09
Tax effect of deferred tax valuation per share | ​ | ​ | — | ​ | ​ | —
Tax benefit distribution per share | ​ | ​ | 0.03 | ​ | ​ | —
Tax effect of tax benefit distribution per share | ​ | ​ | (0.00) | ​ | ​ | —
Adjusted Diluted EPS | ​ | $ | 0.88 | ​ | $ | 1.55

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| 01 - Thomas D. Brisbin 04 - Dennis V. McGinn 07 - Mohammad Shahidehpour 02 - Steven A. Cohen 05 - Wanda K. Reder 03 - Cynthia A. Downes 06 - Keith W. Renken For Withhold For Withhold For Withhold 1UPX Using a black ink pen, mark your votes with an X as shown in this example. Please do not write outside the designated areas. 03T4YC + + 2. Ratification of the appointment of Crowe LLP as the independent registered public accounting firm for the year ending December 29, 2023. 3. Approval, on a non-binding advisory basis, of our named executive officer compensation. 1. Election of seven members of the Board of Directors, each to serve a one-year term or until their successors are duly elected and qualified: For Against Abstain Please sign exactly as name appears on this Proxy Card. Joint owners should each sign. When signing as attorney, executor, administrator, trustee, guardian or in another representative capacity, please give full title as such. Corporations and partnerships shall sign in full corporate or partnership name by an authorized person. Date (mm/dd/yyyy) — Please print date below. Signature 1 — Please keep signature within the box. Signature 2 — Please keep signature within the box. B Authorized Signatures — This section must be completed for your vote to be counted. — Date and Sign Below q IF VOTING BY MAIL, SIGN, DETACH AND RETURN THE BOTTOM PORTION IN THE ENCLOSED ENVELOPE. q Annual Meeting Proxy Card For Against Abstain A Proposals — The Board of Directors recommend a vote FOR all the nominees listed and FOR Proposals 2, 3, 4 and 5. 4. Approval of an amendment to the Company’s 2008 Performance Incentive Plan (the “2008 Plan”), including an increase in the number of shares available for grant under the 2008 Plan. 5. Approval of an amendment to the Company's 2006 Employee Stock Purchase Plan (the “ESPP”), including an increase in the number of shares available for issuance under the ESPP. 000004 MR A SAMPLE DESIGNATION (IF ANY) ADD 1 ADD 2 ADD 3 ADD 4 ADD 5 ADD 6 ENDORSEMENT_LINE______________ SACKPACK_____________ 1234 5678 9012 345 MMMMMMMMM MMMMMMMMMMMMMMM 577588 MR A SAMPLE (THIS AREA IS SET UP TO ACCOMMODATE 140 CHARACTERS) MR A SAMPLE AND MR A SAMPLE AND MR A SAMPLE AND MR A SAMPLE AND MR A SAMPLE AND MR A SAMPLE AND MR A SAMPLE AND MR A SAMPLE AND C 1234567890 J N T C123456789 MMMMMMMMMMMM MMMMMMM 000000000.000000 ext 000000000.000000 ext 000000000.000000 ext 000000000.000000 ext 000000000.000000 ext 000000000.000000 ext If no electronic voting, delete QR code and control # Δ ≈ Online Before the Annual Meeting. Go to www.investorvote.com/WLDN or scan the QR code — login details are located in the shaded bar below. Phone Call toll free 1-800-652-VOTE (8683) within the USA, US territories and Canada. During the Annual Meeting. Go to https://edge.media-server.com/mmc/p/tydzawp6. Have the number that is printed in the shaded bar below available and follow the instructions on the reverse side. You may vote online or by phone instead of mailing this card. Your vote matters – here’s how to vote!

| Small steps make an impact. Help the environment by consenting to receive electronic delivery, sign up at www.investorvote.com/WLDN Proxy Solicited on Behalf of the Board of Directors of the Company for the Annual Meeting to be held on June 8, 2023 The undersigned stockholder of Willdan Group, Inc., a Delaware corporation (the “Company”), hereby appoints Michael Bieber and Micah Chen, or either of them acting alone, as proxies for the undersigned, each with full power of substitution, to represent and vote, as designated on the reverse side of this ballot, all of the shares of common stock of the Company that the undersigned is entitled to vote at the Annual Meeting of Stockholders of the Company to be held on June 8, 2023 at 10:00 a.m. Pacific Daylight Time at https://edge.media-server.com/mmc/p/tydzawp6, and at any adjournment or postponement thereof, and otherwise to represent the undersigned at the meeting with all powers possessed by the undersigned as if the undersigned was present at the meeting. The undersigned hereby acknowledges receipt of the Notice of the Annual Meeting of Stockholders and the accompanying Proxy Statement. The Board of Directors has fixed the close of business on April 18, 2023 as the record date for determining the stockholders entitled to notice of and to vote at the Annual Meeting and at any adjournment or postponement thereof. Only stockholders of record of the Company’s common stock, $0.01 par value per share, at the close of business on that date will be entitled to notice of and to vote at the Annual Meeting and at any adjournment or postponement thereof. The votes entitled to be cast by the undersigned will be cast as instructed on the reverse side hereof. If this Proxy is executed but no instruction is given, the votes entitled to be cast by the undersigned will be cast “FOR” each of the nominees for director and “FOR” Proposals 2, 3, 4 and 5. The votes entitled to be cast by the undersigned will be cast in the discretion of the Proxy holder on any other matter that may properly come before the Annual Meeting or any adjournment or postponement thereof. The signer hereby revokes all Proxies heretofore given by the signer with respect to said meeting or any adjournment or postponement thereof. YOUR VOTE IS IMPORTANT! PLEASE VOTE, SIGN, DATE AND RETURN THIS PROXY CARD PROMPTLY USING THE ENCLOSED ENVELOPE OR VOTE BY TELEPHONE OR INTERNET PURSUANT TO THE INSTRUCTIONS ON THE REVERSE SIDE. Proxy — Willdan Group, Inc. q IF VOTING BY MAIL, SIGN, DETACH AND RETURN THE BOTTOM PORTION IN THE ENCLOSED ENVELOPE. q Change of Address — Please print new address below. Comments — Please print your comments below. C Non-Voting Items + + The 2023 Annual Meeting of Stockholders of WILLDAN GROUP, INC. will be held on Thursday, June 8, 2023, 10:00 A.M. Pacific Daylight Time, virtually via the internet at https://edge.media-server.com/mmc/p/tydzawp6. To access the virtual meeting, you must have the information that is printed in the shaded bar located on the reverse side of this form.