WLDN

SEC source: 0001415889-23-012614 · form4-08242023_090826.xml · nonDerivative · entry 1

CHEN MICAH · CIK 0001733678 · GENERAL COUNSEL

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,728

F1 · shares: Represents shares of Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of the performance-based restricted stock units on August 21, 2023.

F2 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $22.60 to $23.09, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (2), footnote (4) and footnote (5).

F3 · balance_after: Includes 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, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

SEC source: 0001415889-23-012506 · form4-08222023_100811.xml · nonDerivative · entry 1

EARLY CREIGHTON K · CIK 0000904702 · VICE PRESIDENT AND CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 66,950

F1 · shares: Represents performance-based restricted stock units previously granted to the Reporting Person by the Issuer on August 2, 2022. The performance conditions applicable to the award were determined to have been satisfied by the Issuer's Compensation Committee on August 21, 2023, resulting in the immediate vesting of the restricted stock units as to 1,736 shares of Common Stock.

F2 · balance_after: Includes 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, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

F3 · balance_after: Includes 715 shares of Common Stock purchased under the Amended and Restated Willdan Group, Inc. 2006 Employee Stock Purchase Plan on June 30, 2023.

SEC source: 0001415889-23-012518 · form4-08222023_100803.xml · nonDerivative · entry 1

BIEBER MICHAEL A · CIK 0001270606 · PRESIDENT

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 144,088

F1 · shares: Represents performance-based restricted stock units previously granted to the Reporting Person by the Issuer on August 2, 2022. The performance conditions applicable to the award were determined to have been satisfied by the Issuer's Compensation Committee on August 21, 2023, resulting in the immediate vesting of the restricted stock units as to 8,246 shares of Common Stock.

F2 · balance_after: Includes 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, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

F3 · balance_after: Includes 823 shares of Common Stock purchased under the Amended and Restated Willdan Group, Inc. 2006 Employee Stock Purchase Plan on June 30, 2023.

SEC source: 0001415889-23-012513 · form4-08222023_100807.xml · nonDerivative · entry 1

Brisbin Thomas Donald · CIK 0001395188 · Director · CHIEF EXECUTIVE OFFICER · CHAIRMAN OF THE BOARD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 404,475

F1 · shares: Represents performance-based restricted stock units previously granted to the Reporting Person by the Issuer on August 2, 2022. The performance conditions applicable to the award were determined to have been satisfied by the Issuer's Compensation Committee on August 21, 2023, resulting in the immediate vesting of the restricted stock units as to 13,648 shares of Common Stock.

F2 · balance_after: Includes (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, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

F3 · balance_after: Includes 823 shares of Common Stock purchased under the Amended and Restated Willdan Group, Inc. 2006 Employee Stock Purchase Plan on June 30, 2023.

SEC source: 0001415889-23-012509 · form4-08222023_100802.xml · nonDerivative · entry 1

CHEN MICAH · CIK 0001733678 · GENERAL COUNSEL

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,033

F1 · shares: Represents performance-based restricted stock units previously granted to the Reporting Person by the Issuer on August 2, 2022. The performance conditions applicable to the award were determined to have been satisfied by the Issuer's Compensation Committee on August 21, 2023, resulting in the immediate vesting of the restricted stock units as to 1,736 shares of Common Stock.

F2 · balance_after: Includes 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, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

F3 · balance_after: Includes 823 shares of Common Stock purchased under the Amended and Restated Willdan Group, Inc. 2006 Employee Stock Purchase Plan on June 30, 2023.

SEC source: 0001654954-23-010217 · section16.xml · nonDerivative · entry 2

Forager Fund, L.P. · CIK 0001539281 · 10% owner

Kissel Edward Urban · CIK 0001877495 · 10% owner

MacArthur Robert Symmes · CIK 0001877496 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,910,513

SEC source: 0001654954-23-010217 · section16.xml · nonDerivative · entry 1

Forager Fund, L.P. · CIK 0001539281 · 10% owner

Kissel Edward Urban · CIK 0001877495 · 10% owner

MacArthur Robert Symmes · CIK 0001877496 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 0

F1 · ownership.nature: The reported shares were held through a separate account managed by Forager Capital Management, LLC (the "Manager") and sold to Forager Fund, L.P. (the "Fund"). The Manager is the sole general partner of the Fund, and each of Messrs. Kissel and MacArthur is a principal of the Manager. The reported transaction involved a change in the form of beneficial ownership of the reporting persons with respect to the transferred shares, . Each of the Reporting Persons disclaims beneficial ownership of such shares except to the extent of his or its pecuniary interest therein, if any.

SEC source: 0001415889-23-009533 · form4-06092023_100622.xml · nonDerivative · entry 1

REDER WANDA KAY · CIK 0001895686 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,497

F1 · shares: Represents shares of restricted stock awarded to the Reporting Person by the Issuer on June 7, 2023, which vest in two substantially equal installments on each of June 7, 2024 and June 7, 2025.

F2 · balance_after: Includes (i) 1,295 shares of restricted stock that vest on June 9, 2024 and (ii) 662 shares of restricted stock that vest on December 6, 2023.

SEC source: 0001415889-23-009529 · form4-06092023_100641.xml · nonDerivative · entry 1

Cohen Steven A · CIK 0001640413 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,320

F1 · shares: Represents shares of restricted stock awarded to the Reporting Person by the Issuer on June 7, 2023, which vest in two substantially equal installments on each of June 7, 2024 and June 7, 2025.

F2 · balance_after: Includes 1,295 shares of restricted stock that vest on June 9, 2024.

SEC source: 0001415889-23-009534 · form4-06092023_100621.xml · nonDerivative · entry 1

Shahidehpour Mohammad · CIK 0001640436 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,792

F1 · shares: Represents shares of restricted stock awarded to the Reporting Person by the Issuer on June 7, 2023, which vest in two substantially equal installments on each of June 7, 2024 and June 7, 2025.

F2 · balance_after: Includes 1,295 shares of restricted stock that vest on June 9, 2024.

SEC source: 0001415889-23-009535 · form4-06092023_100636.xml · nonDerivative · entry 1

RENKEN KEITH · CIK 0001251079 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 61,320

F1 · shares: Represents shares of restricted stock awarded to the Reporting Person by the Issuer on June 7, 2023, which vest in two substantially equal installments on each of June 7, 2024 and June 7, 2025.

F2 · balance_after: Includes 1,295 shares of restricted stock that vest on June 9, 2024.

SEC source: 0001415889-23-009532 · form4-06092023_100610.xml · nonDerivative · entry 1

McGinn Dennis V · CIK 0001701806 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,599

F1 · shares: Represents shares of restricted stock awarded to the Reporting Person by the Issuer on June 7, 2023, which vest in two substantially equal installments on each of June 7, 2024 and June 7, 2025.

F2 · balance_after: Includes 1,295 shares of restricted stock that vest on June 9, 2024.

SEC source: 0001415889-23-009530 · form4-06092023_100648.xml · nonDerivative · entry 1

Downes Cynthia · CIK 0001518288 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,643

F1 · shares: Represents shares of restricted stock awarded to the Reporting Person by the Issuer on June 7, 2023, which vest in two substantially equal installments on each of June 7, 2024 and June 7, 2025.

F2 · balance_after: Includes (i) 1,295 shares of restricted stock that vest on June 9, 2024 and (ii) 735 shares of restricted stock that vest on August 4, 2023.

SEC source: 0001415889-23-007478 · form4-05052023_100512.xml · nonDerivative · entry 1

CHEN MICAH · CIK 0001733678 · GENERAL COUNSEL

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 22,474

F1 · shares: Represents shares of the Issuer's Common Stock withheld for tax withholding purposes in connection with the vesting of restricted stock on May 4, 2023, which restricted stock was granted on May 4, 2021.

F2 · balance_after: Includes 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, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

SEC source: 0001415889-23-004909 · form4-03152023_120357.xml · nonDerivative · entry 2

EARLY CREIGHTON K · CIK 0000904702 · VICE PRESIDENT AND CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 64,499

F1 · shares: Represents shares of the Issuer's Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on March 8, 2023, which restricted stock was granted on March 8, 2022.

F4 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $16.54 to $17.04, inclusive.

F3 · balance_after: Includes 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, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

SEC source: 0001415889-23-004909 · form4-03152023_120357.xml · nonDerivative · entry 1

EARLY CREIGHTON K · CIK 0000904702 · VICE PRESIDENT AND CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 64,808

F1 · shares: Represents shares of the Issuer's Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on March 8, 2023, which restricted stock was granted on March 8, 2022.

F2 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $15.53 to $16.52, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (2) and footnote (4).

F3 · balance_after: Includes 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, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

SEC source: 0001415889-23-004911 · form4-03152023_120310.xml · nonDerivative · entry 2

BIEBER MICHAEL A · CIK 0001270606 · PRESIDENT

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 135,019

F1 · shares: Represents shares of the Issuer's Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on March 8, 2023, which restricted stock was granted on March 8, 2022.

F4 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $16.54 to $17.04, inclusive.

F3 · balance_after: Includes 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, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

SEC source: 0001415889-23-004911 · form4-03152023_120310.xml · nonDerivative · entry 1

BIEBER MICHAEL A · CIK 0001270606 · PRESIDENT

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 136,113

F1 · shares: Represents shares of the Issuer's Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on March 8, 2023, which restricted stock was granted on March 8, 2022.

F2 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $15.53 to $16.52, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (2) and footnote (4).

F3 · balance_after: Includes 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, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

SEC source: 0001415889-23-004912 · form4-03152023_120322.xml · nonDerivative · entry 2

Brisbin Thomas Donald · CIK 0001395188 · Director · CHIEF EXECUTIVE OFFICER · CHAIRMAN OF THE BOARD

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 390,004

F1 · shares: Represents shares of the Issuer's Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on March 8, 2023, which restricted stock was granted on March 8, 2022.

F4 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $16.54 to $17.04, inclusive.

F3 · balance_after: Includes (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, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

SEC source: 0001415889-23-004912 · form4-03152023_120322.xml · nonDerivative · entry 1

Brisbin Thomas Donald · CIK 0001395188 · Director · CHIEF EXECUTIVE OFFICER · CHAIRMAN OF THE BOARD

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 391,003

F1 · shares: Represents shares of the Issuer's Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on March 8, 2023, which restricted stock was granted on March 8, 2022.

F2 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $15.53 to $16.52, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (2) and footnote (4).

F3 · balance_after: Includes (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, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

SEC source: 0001415889-23-004910 · form4-03152023_120359.xml · nonDerivative · entry 2

CHEN MICAH · CIK 0001733678 · GENERAL COUNSEL

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,715

F1 · shares: Represents shares of the Issuer's Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on March 8, 2023, which restricted stock was granted on March 8, 2022.

F4 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $16.54 to $17.04, inclusive.

F3 · balance_after: Includes (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, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

SEC source: 0001415889-23-004910 · form4-03152023_120359.xml · nonDerivative · entry 1

CHEN MICAH · CIK 0001733678 · GENERAL COUNSEL

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 24,009

F1 · shares: Represents shares of the Issuer's Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on March 8, 2023, which restricted stock was granted on March 8, 2022.

F2 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $15.53 to $16.52, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (2) and footnote (4).

F3 · balance_after: Includes (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, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

SEC source: 0001415889-23-004813 · form4-03132023_100307.xml · nonDerivative · entry 3

EARLY CREIGHTON K · CIK 0000904702 · VICE PRESIDENT AND CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 65,304

F1 · shares: Represents shares of the Issuer's Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on March 8, 2023, which restricted stock was granted on March 8, 2022.

F5 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $16.60 to $17.00, inclusive.

F3 · balance_after: Includes 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, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

SEC source: 0001415889-23-004813 · form4-03132023_100307.xml · nonDerivative · entry 2

EARLY CREIGHTON K · CIK 0000904702 · VICE PRESIDENT AND CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 65,377

F1 · shares: Represents shares of the Issuer's Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on March 8, 2023, which restricted stock was granted on March 8, 2022.

F4 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $15.56 to $16.53, inclusive.

F3 · balance_after: Includes 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, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

SEC source: 0001415889-23-004813 · form4-03132023_100307.xml · nonDerivative · entry 1

EARLY CREIGHTON K · CIK 0000904702 · VICE PRESIDENT AND CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 65,705

F1 · shares: Represents shares of the Issuer's Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on March 8, 2023, which restricted stock was granted on March 8, 2022.

F2 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $14.55 to $15.53, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (2), footnote (4) and footnote (5).

F3 · balance_after: Includes 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, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

SEC source: 0001415889-23-004815 · form4-03132023_100305.xml · nonDerivative · entry 3

BIEBER MICHAEL A · CIK 0001270606 · PRESIDENT

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 137,871

F1 · shares: Represents shares of the Issuer's Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on March 8, 2023, which restricted stock was granted on March 8, 2022.

F5 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $16.60 to $17.00, inclusive.

F3 · balance_after: Includes 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, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

SEC source: 0001415889-23-004815 · form4-03132023_100305.xml · nonDerivative · entry 2

BIEBER MICHAEL A · CIK 0001270606 · PRESIDENT

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 138,128

F1 · shares: Represents shares of the Issuer's Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on March 8, 2023, which restricted stock was granted on March 8, 2022.

F4 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $15.56 to $16.53, inclusive.

F3 · balance_after: Includes 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, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

SEC source: 0001415889-23-004815 · form4-03132023_100305.xml · nonDerivative · entry 1

BIEBER MICHAEL A · CIK 0001270606 · PRESIDENT

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 139,287

F1 · shares: Represents shares of the Issuer's Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on March 8, 2023, which restricted stock was granted on March 8, 2022.

F2 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $14.55 to $15.53, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (2), footnote (4) and footnote (5).

F3 · balance_after: Includes 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, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

SEC source: 0001415889-23-004811 · form4-03132023_100311.xml · nonDerivative · entry 3

Brisbin Thomas Donald · CIK 0001395188 · Director · CHIEF EXECUTIVE OFFICER · CHAIRMAN OF THE BOARD

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 392,610

F1 · shares: Represents shares of the Issuer's Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on March 8, 2023, which restricted stock was granted on March 8, 2022.

F5 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $16.60 to $17.00, inclusive.

F3 · balance_after: Includes (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, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

SEC source: 0001415889-23-004811 · form4-03132023_100311.xml · nonDerivative · entry 2

Brisbin Thomas Donald · CIK 0001395188 · Director · CHIEF EXECUTIVE OFFICER · CHAIRMAN OF THE BOARD

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 392,845

F1 · shares: Represents shares of the Issuer's Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on March 8, 2023, which restricted stock was granted on March 8, 2022.

F4 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $15.56 to $16.53, inclusive.

F3 · balance_after: Includes (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, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

SEC source: 0001415889-23-004811 · form4-03132023_100311.xml · nonDerivative · entry 1

Brisbin Thomas Donald · CIK 0001395188 · Director · CHIEF EXECUTIVE OFFICER · CHAIRMAN OF THE BOARD

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 393,905

F1 · shares: Represents shares of the Issuer's Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on March 8, 2023, which restricted stock was granted on March 8, 2022.

F2 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $14.55 to $15.53, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (2), footnote (4) and footnote (5).

F3 · balance_after: Includes (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, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

SEC source: 0001415889-23-004809 · form4-03132023_100306.xml · nonDerivative · entry 3

CHEN MICAH · CIK 0001733678 · GENERAL COUNSEL

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 24,480

F1 · shares: Represents shares of the Issuer's Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on March 8, 2023, which restricted stock was granted on March 8, 2022.

F5 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $16.60 to $17.00, inclusive.

F3 · balance_after: Includes (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, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

SEC source: 0001415889-23-004809 · form4-03132023_100306.xml · nonDerivative · entry 2

CHEN MICAH · CIK 0001733678 · GENERAL COUNSEL

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 24,549

F1 · shares: Represents shares of the Issuer's Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on March 8, 2023, which restricted stock was granted on March 8, 2022.

F4 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $15.56 to $16.53, inclusive.

F3 · balance_after: Includes (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, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

SEC source: 0001415889-23-004809 · form4-03132023_100306.xml · nonDerivative · entry 1

CHEN MICAH · CIK 0001733678 · GENERAL COUNSEL

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 24,860

F1 · shares: Represents shares of the Issuer's Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on March 8, 2023, which restricted stock was granted on March 8, 2022.

F2 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $14.55 to $15.53, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (2), footnote (4) and footnote (5).

F3 · balance_after: Includes (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, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

SEC source: 0001415889-23-004683 · form4-03102023_110333.xml · nonDerivative · entry 1

EARLY CREIGHTON K · CIK 0000904702 · VICE PRESIDENT AND CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 66,074

F1 · shares: Represents shares of the Issuer's Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on March 8, 2023, which restricted stock was granted on March 8, 2022.

F2 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $16.90 to $17.35, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · balance_after: Includes 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, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

SEC source: 0001415889-23-004688 · form4-03102023_110331.xml · nonDerivative · entry 1

BIEBER MICHAEL A · CIK 0001270606 · PRESIDENT

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 140,593

F1 · shares: Represents shares of the Issuer's Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on March 8, 2023, which restricted stock was granted on March 8, 2022.

F2 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $16.90 to $17.35, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · balance_after: Includes 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, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

SEC source: 0001415889-23-004690 · form4-03102023_110315.xml · nonDerivative · entry 2

Brisbin Thomas Donald · CIK 0001395188 · Director · CHIEF EXECUTIVE OFFICER · CHAIRMAN OF THE BOARD

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 395,099

F4 · shares: Represents shares of the Issuer's Common Stock withheld for tax withholding purposes in connection with the vesting of restricted stock on March 9, 2023, which restricted stock was granted on March 9, 2021.

F3 · balance_after: Includes (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, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

SEC source: 0001415889-23-004690 · form4-03102023_110315.xml · nonDerivative · entry 1

Brisbin Thomas Donald · CIK 0001395188 · Director · CHIEF EXECUTIVE OFFICER · CHAIRMAN OF THE BOARD

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 398,246

F1 · shares: Represents shares of the Issuer's Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on March 8, 2023, which restricted stock was granted on March 8, 2022.

F2 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $16.90 to $17.35 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · balance_after: Includes (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, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

SEC source: 0001415889-23-004686 · form4-03102023_110337.xml · nonDerivative · entry 1

CHEN MICAH · CIK 0001733678 · GENERAL COUNSEL

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,210

F1 · shares: Represents shares of the Issuer's Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on March 8, 2023, which restricted stock was granted on March 8, 2022.

F2 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $16.90 to $17.35, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · balance_after: Includes (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, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

SEC source: 0001415889-23-004545 · form4-03082023_110340.xml · nonDerivative · entry 1

EARLY CREIGHTON K · CIK 0000904702 · VICE PRESIDENT AND CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 66,902

F1 · shares: Represents shares of restricted stock awarded to the Reporting Person by the Issuer on March 7, 2023, which vest in three substantially equal installments on each of March 7, 2024, March 7, 2025 and March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

F2 · balance_after: Includes 440 shares of Common Stock purchased under the Amended and Restated Willdan Group, Inc. 2006 Employee Stock Purchase Plan on December 31, 2022.

SEC source: 0001415889-23-004538 · form4-03082023_110353.xml · nonDerivative · entry 1

BIEBER MICHAEL A · CIK 0001270606 · PRESIDENT

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 143,525

F1 · shares: Represents shares of restricted stock awarded to the Reporting Person by the Issuer on March 7, 2023, which vest in three substantially equal installments on each of March 7, 2024, March 7, 2025 and March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

F2 · balance_after: Includes 238 shares of Common Stock purchased under the Amended and Restated Willdan Group, Inc. 2006 Employee Stock Purchase Plan on December 31, 2022.

SEC source: 0001415889-23-004541 · form4-03082023_110351.xml · nonDerivative · entry 1

CHEN MICAH · CIK 0001733678 · GENERAL COUNSEL

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,996

F1 · shares: Represents shares of restricted stock awarded to the Reporting Person by the Issuer on March 7, 2023, which vest in three substantially equal installments on each of March 7, 2024, March 7, 2025 and March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

F2 · balance_after: Includes 2,500 shares of restricted stock that vest on May 4, 2023, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

F3 · balance_after: Includes an aggregate of 771 shares of Common Stock purchased under the Amended and Restated Willdan Group, Inc. 2006 Employee Stock Purchase Plan, including 533 shares on June 30, 2022 and 238 shares on December 31, 2022.

SEC source: 0001415889-23-004532 · form4-03082023_110347.xml · nonDerivative · entry 1

Brisbin Thomas Donald · CIK 0001395188 · Director · CHIEF EXECUTIVE OFFICER · CHAIRMAN OF THE BOARD

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 400,927

F1 · shares: Represents shares of restricted stock awarded to the Reporting Person by the Issuer on March 7, 2023, which vest in three substantially equal installments on each of March 7, 2024, March 7, 2025 and March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

F2 · balance_after: Includes18,750 shares of restricted stock that vest in three substantially equal installments on each of March 9, 2023, March 9, 2024 and March 9, 2025, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

F3 · balance_after: Includes 238 shares of Common Stock purchased under the Amended and Restated Willdan Group, Inc. 2006 Employee Stock Purchase Plan on December 31, 2022.

SEC source: 0001654954-23-001025 · section16.xml · nonDerivative · entry 1

Forager Fund, L.P. · CIK 0001539281 · 10% owner

Kissel Edward Urban · CIK 0001877495 · 10% owner

MacArthur Robert Symmes · CIK 0001877496 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,524,976

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $17.85 to $18.70, inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within this range.

F2 · ownership.direct: The shares reported are directly held by Forager Fund, L.P. (the "Fund"). Each of Messrs. Kissel and MacArthur is a principal of Forager Capital Management, LLC, the general partner of the Fund (the "GP"), and has shared authority to vote (or direct the vote of), and to dispose (or direct the disposal) of, these shares on behalf of the GP. Each of the Reporting Persons disclaims beneficial ownership of such shares except to the extent of his or its pecuniary interest therein, if any.

SEC source: 0001654954-23-000864 · section16.xml · nonDerivative · entry 4

Forager Fund, L.P. · CIK 0001539281 · 10% owner

Kissel Edward Urban · CIK 0001877495 · 10% owner

MacArthur Robert Symmes · CIK 0001877496 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,513,584

F5 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $17.48 to $17.90, inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within this range.

F2 · ownership.direct: The shares reported are directly held by Forager Fund, L.P. (the "Fund"). Each of Messrs. Kissel and MacArthur is a principal of Forager Capital Management, LLC, the general partner of the Fund (the "GP"), and has shared authority to vote (or direct the vote of), and to dispose (or direct the disposal) of, these shares on behalf of the GP. Each of the Reporting Persons disclaims beneficial ownership of such shares except to the extent of his or its pecuniary interest therein, if any.

SEC source: 0001654954-23-000864 · section16.xml · nonDerivative · entry 3

Forager Fund, L.P. · CIK 0001539281 · 10% owner

Kissel Edward Urban · CIK 0001877495 · 10% owner

MacArthur Robert Symmes · CIK 0001877496 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,507,793

F4 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $17.91 to $18.905, inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within this range.

F2 · ownership.direct: The shares reported are directly held by Forager Fund, L.P. (the "Fund"). Each of Messrs. Kissel and MacArthur is a principal of Forager Capital Management, LLC, the general partner of the Fund (the "GP"), and has shared authority to vote (or direct the vote of), and to dispose (or direct the disposal) of, these shares on behalf of the GP. Each of the Reporting Persons disclaims beneficial ownership of such shares except to the extent of his or its pecuniary interest therein, if any.

SEC source: 0001654954-23-000864 · section16.xml · nonDerivative · entry 2

Forager Fund, L.P. · CIK 0001539281 · 10% owner

Kissel Edward Urban · CIK 0001877495 · 10% owner

MacArthur Robert Symmes · CIK 0001877496 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,486,807

F3 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $17.37 to $17.685, inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within this range.

F2 · ownership.direct: The shares reported are directly held by Forager Fund, L.P. (the "Fund"). Each of Messrs. Kissel and MacArthur is a principal of Forager Capital Management, LLC, the general partner of the Fund (the "GP"), and has shared authority to vote (or direct the vote of), and to dispose (or direct the disposal) of, these shares on behalf of the GP. Each of the Reporting Persons disclaims beneficial ownership of such shares except to the extent of his or its pecuniary interest therein, if any.

SEC source: 0001654954-23-000864 · section16.xml · nonDerivative · entry 1

Forager Fund, L.P. · CIK 0001539281 · 10% owner

Kissel Edward Urban · CIK 0001877495 · 10% owner

MacArthur Robert Symmes · CIK 0001877496 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,471,032

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $17.695 to $18.69, inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within this range.

F2 · ownership.direct: The shares reported are directly held by Forager Fund, L.P. (the "Fund"). Each of Messrs. Kissel and MacArthur is a principal of Forager Capital Management, LLC, the general partner of the Fund (the "GP"), and has shared authority to vote (or direct the vote of), and to dispose (or direct the disposal) of, these shares on behalf of the GP. Each of the Reporting Persons disclaims beneficial ownership of such shares except to the extent of his or its pecuniary interest therein, if any.

SEC source: 0001415889-22-012645 · form4-12162022_111229.xml · nonDerivative · entry 2

EARLY CREIGHTON K · CIK 0000904702 · VICE PRESIDENT AND CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 43,662

F1 · shares: Represents shares of Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on December 11, 2022.

F4 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $16.60 to $16.85, inclusive.

F3 · balance_after: Include 3,800 shares of restricted stock that vest on March 8, 2023, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.

SEC source: 0001415889-22-012645 · form4-12162022_111229.xml · nonDerivative · entry 1

EARLY CREIGHTON K · CIK 0000904702 · VICE PRESIDENT AND CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 43,961

F1 · shares: Represents shares of Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on December 11, 2022.

F2 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $16.31 to $16.84, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (2) and footnote (4).

F3 · balance_after: Include 3,800 shares of restricted stock that vest on March 8, 2023, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date.