Results of Operations and Financial Condition Willdan Group, Inc. (“Willdan”) issued a press release on August 6, 2026. The press release announced Willdan’s financial results for the second quarter ended July 3, 2026. A copy of the press release is attached as Exhibit 99.1 hereto and is hereby incorporated herein by reference in its entirety. The information in this

The filing pertains to compensatory arrangements and amendments to the performance incentive plan, not a management change.

Results of Operations and Financial Condition Willdan Group, Inc. (“Willdan”) issued a press release on May 7, 2026. The press release announced Willdan’s financial results for the first quarter ended April 3, 2026. A copy of the press release is attached as Exhibit 99.1 hereto and is hereby incorporated herein by reference in its entirety. The information in this

Results of Operations and Financial Condition Willdan Group, Inc. (“Willdan”) issued a press release on February 26, 2026. The press release announced Willdan’s financial results for the fourth quarter and fiscal year ended January 2, 2026. A copy of the press release is attached as Exhibit 99.1 hereto and is hereby incorporated herein by reference in its entirety. The information in this

Results of Operations and Financial Condition Willdan Group, Inc. (“Willdan”) issued a press release on November 6, 2025. The press release announced Willdan’s financial results for the third quarter ended October 3, 2025. A copy of the press release is attached as Exhibit 99.1 hereto and is hereby incorporated herein by reference in its entirety. The information in this

Results of Operations and Financial Condition Willdan Group, Inc. (“Willdan”) issued a press release on August 7, 2025. The press release announced Willdan’s financial results for the second quarter ended July 4, 2025. A copy of the press release is attached as Exhibit 99.1 hereto and is hereby incorporated herein by reference in its entirety. The information in this

The filing pertains to compensatory arrangements and amendments to the performance incentive plan, not a management change.

Results of Operations and Financial Condition Willdan Group, Inc. (“Willdan”) issued a press release on May 8, 2025. The press release announced Willdan’s financial results for the first quarter ended April 4, 2025. A copy of the press release is attached as Exhibit 99.1 hereto and is hereby incorporated herein by reference in its entirety. The information in this

Results of Operations and Financial Condition Willdan Group, Inc. (“Willdan”) issued a press release on March 6, 2025. The press release announced Willdan’s financial results for the fourth quarter and fiscal year ended December 27, 2024. A copy of the press release is attached as Exhibit 99.1 hereto and is hereby incorporated herein by reference in its entirety. The information in this

New employment agreements were signed with senior executives, outlining their compensation and severance benefits.

Results of Operations and Financial Condition Willdan Group, Inc. (“Willdan”) issued a press release on October 31, 2024. The press release announced Willdan’s financial results for the third quarter ended September 27, 2024. A copy of the press release is attached as Exhibit 99.1 hereto and is hereby incorporated herein by reference in its entirety. The information in this

Results of Operations and Financial Condition Willdan Group, Inc. (“Willdan”) issued a press release on August 1, 2024. The press release announced Willdan’s financial results for the second quarter ended June 28, 2024. A copy of the press release is attached as Exhibit 99.1 hereto and is hereby incorporated herein by reference in its entirety. The information in this

The filing pertains to compensatory arrangements and amendments to the performance incentive plan, not a management change.

Results of Operations and Financial Condition Willdan Group, Inc. (“Willdan”) issued a press release on May 2, 2024. The press release announced Willdan’s financial results for the first quarter ended March 29, 2024. A copy of the press release is attached as Exhibit 99.1 hereto and is hereby incorporated herein by reference in its entirety. The information in this

Results of Operations and Financial Condition Willdan Group, Inc. (“Willdan”) issued a press release on March 7, 2024. The press release announced Willdan’s financial results for the fourth quarter and fiscal year ended December 29, 2023. A copy of the press release is attached as Exhibit 99.1 hereto and is hereby incorporated herein by reference in its entirety. The information in this

Director — Keith W. Renken: Mr. Renken retired and resigned from the Board of Directors.

Chief Executive Officer — Thomas D. Brisbin: Dr. Brisbin resigned as CEO and entered into a consulting agreement with the company.

CEO — Thomas D. Brisbin: Dr. Brisbin is retiring from the CEO role but will continue as Chairman of the Board, and Michael A. Bieber has been appointed as the new President and CEO.

Results of Operations and Financial Condition Willdan Group, Inc. (“Willdan”) issued a press release on November 2, 2023. The press release announced Willdan’s financial results for the third quarter ended September 29, 2023. A copy of the press release is attached as Exhibit 99.1 hereto and is hereby incorporated herein by reference in its entirety. The information in this

Material Modification to Rights of Security Holders. As noted above under

Entry into a Material Definitive Agreement. On September 29, 2023 (the “Closing Date”), Willdan Group, Inc. (the “Company”) and certain of its subsidiaries entered into a credit agreement (the “Credit Agreement”) with a syndicate of financial institutions as lenders and BMO Bank, N.A. (“BMO”), as administrative agent. The Credit Agreement replaces the Company’s Amended and Restated Credit Agreement, dated as of June 26, 2019, (as amended, the “Prior Credit Agreement”), by and among the Compan…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information set forth above under

Termination of a Material Definitive Agreement. On September 29, 2023, using proceeds from the Term Loan, the Company repaid in full all of its outstanding obligations under the Prior Credit Agreement. Furthermore, on September 29, 2023, in connection with the closing of the Credit Agreement (as described above under

Results of Operations and Financial Condition Willdan Group, Inc. (“Willdan”) issued a press release on August 3, 2023. The press release announced Willdan’s financial results for the second quarter ended June 30, 2023. A copy of the press release is attached as Exhibit 99.1 hereto and is hereby incorporated herein by reference in its entirety. The information in this

The filing pertains to compensatory arrangements and plan amendments, not a management change.