WLDN

SEC source: 0001654954-24-007924 · 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: No plan indicated

Ownership: Direct

Disclosed balance after: 1,444,455

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $29.56 to $30.10, 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: 0001654954-24-007924 · 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: 1,449,455

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $29.00 to $29.73 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: 0001654954-24-007924 · 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: Direct

Disclosed balance after: 1,456,097

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $29.93 to $30.15 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: 0001654954-24-007732 · 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: No plan indicated

Ownership: Direct

Disclosed balance after: 1,456,796

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $30.51 to $30.75, 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: 0001415889-24-016978 · form4-06142024_090653.xml · derivative · entry 3

BIEBER MICHAEL A · CIK 0001270606 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 55,250

Underlying: Common Stock · 6,000 shares

Expires 2024-12-31

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_date: Stock options granted under the Willdan Group, Inc. Amended and Restated 2008 Performance Incentive Plan, which vested in three equal installments on each of December 31, 2015, December 31, 2016 and December 31, 2017.

SEC source: 0001415889-24-016978 · form4-06142024_090653.xml · nonDerivative · entry 2

BIEBER MICHAEL A · CIK 0001270606 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 169,043

F2 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $30.30 to $30.44, inclusive. The Reporting Person undertakes to provide to Willdan Group, Inc., any security holder of Willdan Group, Inc., 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.

F1 · balance_after: Includes (i) 17,500 shares of restricted stock units that vest in three substantially equal installments on each of March 20, 2025, March 20, 2026 and March 20, 2027 and (ii) 8,867 shares of restricted stock that vest in two substantially equal installments on each of 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: 0001415889-24-016978 · form4-06142024_090653.xml · nonDerivative · entry 1

BIEBER MICHAEL A · CIK 0001270606 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 173,503

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: Includes (i) 17,500 shares of restricted stock units that vest in three substantially equal installments on each of March 20, 2025, March 20, 2026 and March 20, 2027 and (ii) 8,867 shares of restricted stock that vest in two substantially equal installments on each of 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: 0001654954-24-007732 · 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: 1,457,896

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $31.10 to $31.59 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: 0001415889-24-016741 · form4-06132024_100650.xml · nonDerivative · entry 1

REDER WANDA KAY · CIK 0001895686 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,745

F1 · shares: Represents shares of restricted stock awarded to the Reporting Person by the Issuer on June 12, 2024, which vest in two substantially equal installments on each of June 12, 2025 and June 12, 2026.

F2 · balance_after: Includes 1,793 shares of restricted stock that vest on June 7, 2025.

SEC source: 0001415889-24-016729 · form4-06132024_100633.xml · nonDerivative · entry 1

Cohen Steven A · CIK 0001640413 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 27,568

F1 · shares: Represents shares of restricted stock awarded to the Reporting Person by the Issuer on June 12, 2024, which vest in two substantially equal installments on each of June 12, 2025 and June 12, 2026.

F2 · balance_after: Includes 1,793 shares of restricted stock that vest on June 7, 2025.

SEC source: 0001415889-24-016727 · form4-06132024_100649.xml · nonDerivative · entry 1

Shahidehpour Mohammad · CIK 0001640436 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,040

F1 · shares: Represents shares of restricted stock awarded to the Reporting Person by the Issuer on June 12, 2024, which vest in two substantially equal installments on each of June 12, 2025 and June 12, 2026.

F2 · balance_after: Includes 1,793 shares of restricted stock that vest on June 7, 2025.

SEC source: 0001415889-24-016725 · form4-06132024_100603.xml · derivative · entry 6

BIEBER MICHAEL A · CIK 0001270606 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 61,250

Underlying: Common Stock · 6,000 shares

Expires 2024-12-31

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_date: Stock options granted under the Willdan Group, Inc. Amended and Restated 2008 Performance Incentive Plan, which vested in three equal installments on each of December 31, 2015, December 31, 2016 and December 31, 2017.

SEC source: 0001415889-24-016725 · form4-06132024_100603.xml · nonDerivative · entry 4

BIEBER MICHAEL A · CIK 0001270606 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 167,503

F3 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $30.64 to $31.28, inclusive. The Reporting Person undertakes to provide to Willdan Group, Inc., any security holder of Willdan Group, Inc., 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.

F1 · balance_after: Includes (i) 17,500 shares of restricted stock units that vest in three substantially equal installments on each of March 20, 2025, March 20, 2026 and March 20, 2027 and (ii) 8,867 shares of restricted stock that vest in two substantially equal installments on each of 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: 0001415889-24-016725 · form4-06132024_100603.xml · nonDerivative · entry 3

BIEBER MICHAEL A · CIK 0001270606 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 171,897

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: Includes (i) 17,500 shares of restricted stock units that vest in three substantially equal installments on each of March 20, 2025, March 20, 2026 and March 20, 2027 and (ii) 8,867 shares of restricted stock that vest in two substantially equal installments on each of 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: 0001415889-24-016736 · form4-06132024_100613.xml · nonDerivative · entry 1

McGinn Dennis V · CIK 0001701806 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,847

F1 · shares: Represents shares of restricted stock awarded to the Reporting Person by the Issuer on June 12, 2024, which vest in two substantially equal installments on each of June 12, 2025 and June 12, 2026.

F2 · balance_after: Includes 1,793 shares of restricted stock that vest on June 7, 2025.

SEC source: 0001415889-24-016732 · form4-06132024_100630.xml · nonDerivative · entry 1

Downes Cynthia · CIK 0001518288 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,891

F1 · shares: Represents shares of restricted stock awarded to the Reporting Person by the Issuer on June 12, 2024, which vest in two substantially equal installments on each of June 12, 2025 and June 12, 2026.

F2 · balance_after: Includes 1,793 shares of restricted stock that vest on June 7, 2025.

SEC source: 0001415889-24-016734 · form4-06132024_100603.xml · nonDerivative · entry 1

Brisbin Thomas Donald · CIK 0001395188 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 416,156

F1 · shares: Represents shares of restricted stock awarded to the Reporting Person by the Issuer on June 12, 2024, which vest in two substantially equal installments on each of June 12, 2025 and June 12, 2026.

F2 · balance_after: Includes (i) 11,667 shares of restricted stock that vest in two substantially equal installments on each of March 7, 2025 and March 7, 2026 and (ii) 6,250 shares of restricted stock that vest on March 9, 2025.

SEC source: 0001654954-24-007732 · 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: Direct

Disclosed balance after: 1,465,837

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $30.10 to $30.41 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: 0001415889-24-016725 · form4-06132024_100603.xml · derivative · entry 5

BIEBER MICHAEL A · CIK 0001270606 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 67,250

Underlying: Common Stock · 6,000 shares

Expires 2024-12-31

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_date: Stock options granted under the Willdan Group, Inc. Amended and Restated 2008 Performance Incentive Plan, which vested in three equal installments on each of December 31, 2015, December 31, 2016 and December 31, 2017.

SEC source: 0001415889-24-016725 · form4-06132024_100603.xml · nonDerivative · entry 2

BIEBER MICHAEL A · CIK 0001270606 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 165,897

F2 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $30.20 to $30.41, inclusive. The Reporting Person undertakes to provide to Willdan Group, Inc., any security holder of Willdan Group, Inc., 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.

F1 · balance_after: Includes (i) 17,500 shares of restricted stock units that vest in three substantially equal installments on each of March 20, 2025, March 20, 2026 and March 20, 2027 and (ii) 8,867 shares of restricted stock that vest in two substantially equal installments on each of 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: 0001415889-24-016725 · form4-06132024_100603.xml · nonDerivative · entry 1

BIEBER MICHAEL A · CIK 0001270606 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 170,361

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: Includes (i) 17,500 shares of restricted stock units that vest in three substantially equal installments on each of March 20, 2025, March 20, 2026 and March 20, 2027 and (ii) 8,867 shares of restricted stock that vest in two substantially equal installments on each of 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: 0001654954-24-007567 · 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: No plan indicated

Ownership: Direct

Disclosed balance after: 1,475,837

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $30.86 to $31.24, 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: 0001415889-24-016537 · form4-06122024_090659.xml · nonDerivative · entry 1

Shahidehpour Mohammad · CIK 0001640436 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,792

F1 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $30.60 to $31.05 inclusive. The Reporting Person undertakes to provide to Willdan Group, Inc., any security holder of Willdan Group, Inc., 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.

F2 · balance_after: Includes 1,793 shares of restricted stock that vest on June 7, 2025.

SEC source: 0001415889-24-016535 · form4-06122024_090613.xml · derivative · entry 3

BIEBER MICHAEL A · CIK 0001270606 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 73,250

Underlying: Common Stock · 4,514 shares

Expires 2024-12-31

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_date: Stock options granted under the Willdan Group, Inc. Amended and Restated 2008 Performance Incentive Plan, which vested in three equal installments on each of December 31, 2015, December 31, 2016 and December 31, 2017.

SEC source: 0001415889-24-016535 · form4-06122024_090613.xml · nonDerivative · entry 2

BIEBER MICHAEL A · CIK 0001270606 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 164,361

F2 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $31.00 to $31.12, inclusive. The Reporting Person undertakes to provide to Willdan Group, Inc., any security holder of Willdan Group, Inc., 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.

F1 · balance_after: Includes (i) 17,500 shares of restricted stock units that vest in three substantially equal installments on each of March 20, 2025, March 20, 2026 and March 20, 2027 and (ii) 8,867 shares of restricted stock that vest in two substantially equal installments on each of 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: 0001415889-24-016535 · form4-06122024_090613.xml · nonDerivative · entry 1

BIEBER MICHAEL A · CIK 0001270606 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 167,694

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: Includes (i) 17,500 shares of restricted stock units that vest in three substantially equal installments on each of March 20, 2025, March 20, 2026 and March 20, 2027 and (ii) 8,867 shares of restricted stock that vest in two substantially equal installments on each of 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: 0001654954-24-007567 · 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: 1,486,837

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $31.31 to $31.61 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: 0001654954-24-007567 · 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: Direct

Disclosed balance after: 1,497,590

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $31.71 to $32.58 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: 0001415889-24-014904 · form4-05302024_090500.xml · derivative · entry 6

Brisbin Thomas Donald · CIK 0001395188 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,576 shares

Expires 2024-06-06

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_date: Stock options granted under the Willdan Group, Inc. Amended and Restated 2008 Performance Incentive Plan, which vested in three equal installments on each of June 6, 2015, June 6, 2016 and June 6, 2017.

SEC source: 0001415889-24-014904 · form4-05302024_090500.xml · nonDerivative · entry 4

Brisbin Thomas Donald · CIK 0001395188 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 413,908

F3 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $31.19 to $31.51, inclusive. The reporting person undertakes to provide to Willdan Group, Inc., any security holder of Willdan Group, Inc., 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.

F1 · balance_after: Includes (i) 11,667 shares of restricted stock that vest in two substantially equal installments on each of March 7, 2025 and March 7, 2026, and (ii) 6,250 shares of restricted stock that vest on March 9, 2025.

SEC source: 0001415889-24-014904 · form4-05302024_090500.xml · nonDerivative · entry 3

Brisbin Thomas Donald · CIK 0001395188 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 415,484

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: Includes (i) 11,667 shares of restricted stock that vest in two substantially equal installments on each of March 7, 2025 and March 7, 2026, and (ii) 6,250 shares of restricted stock that vest on March 9, 2025.

SEC source: 0001415889-24-014904 · form4-05302024_090500.xml · derivative · entry 5

Brisbin Thomas Donald · CIK 0001395188 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,576

Underlying: Common Stock · 18,245 shares

Expires 2024-06-06

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_date: Stock options granted under the Willdan Group, Inc. Amended and Restated 2008 Performance Incentive Plan, which vested in three equal installments on each of June 6, 2015, June 6, 2016 and June 6, 2017.

SEC source: 0001415889-24-014904 · form4-05302024_090500.xml · nonDerivative · entry 2

Brisbin Thomas Donald · CIK 0001395188 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 413,908

F2 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $32.02 to $32.19, inclusive. The reporting person undertakes to provide to Willdan Group, Inc., any security holder of Willdan Group, Inc., 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.

F1 · balance_after: Includes (i) 11,667 shares of restricted stock that vest in two substantially equal installments on each of March 7, 2025 and March 7, 2026, and (ii) 6,250 shares of restricted stock that vest on March 9, 2025.

SEC source: 0001415889-24-014904 · form4-05302024_090500.xml · nonDerivative · entry 1

Brisbin Thomas Donald · CIK 0001395188 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 432,153

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: Includes (i) 11,667 shares of restricted stock that vest in two substantially equal installments on each of March 7, 2025 and March 7, 2026, and (ii) 6,250 shares of restricted stock that vest on March 9, 2025.

SEC source: 0001415889-24-014697 · form4-05282024_090517.xml · derivative · entry 3

Brisbin Thomas Donald · CIK 0001395188 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,821

Underlying: Common Stock · 397 shares

Expires 2024-06-06

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: Stock options granted under the Willdan Group, Inc. Amended and Restated 2008 Performance Incentive Plan, which vested in three equal installments on each of June 6, 2015, June 6, 2016 and June 6, 2017.

SEC source: 0001415889-24-014697 · form4-05282024_090517.xml · nonDerivative · entry 2

Brisbin Thomas Donald · CIK 0001395188 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 413,908

F1 · balance_after: Includes (i) 11,667 shares of restricted stock that vest in two substantially equal installments on each of March 7, 2025 and March 7, 2026, and (ii) 6,250 shares of restricted stock that vest on March 9, 2025.

SEC source: 0001415889-24-014697 · form4-05282024_090517.xml · nonDerivative · entry 1

Brisbin Thomas Donald · CIK 0001395188 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 414,305

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: Includes (i) 11,667 shares of restricted stock that vest in two substantially equal installments on each of March 7, 2025 and March 7, 2026, and (ii) 6,250 shares of restricted stock that vest on March 9, 2025.

SEC source: 0001415889-24-014326 · form4-05232024_090535.xml · derivative · entry 6

Brisbin Thomas Donald · CIK 0001395188 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,218

Underlying: Common Stock · 5,267 shares

Expires 2024-06-06

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_date: Stock options granted under the Willdan Group, Inc. Amended and Restated 2008 Performance Incentive Plan, which vested in three equal installments on each of June 6, 2015, June 6, 2016 and June 6, 2017.

SEC source: 0001415889-24-014326 · form4-05232024_090535.xml · nonDerivative · entry 4

Brisbin Thomas Donald · CIK 0001395188 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 413,908

F3 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $32.16 to $32.20, inclusive. The reporting person undertakes to provide to Willdan Group, Inc., any security holder of Willdan Group, Inc., 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.

F1 · balance_after: Includes (i) 11,667 shares of restricted stock that vest in two substantially equal installments on each of March 7, 2025 and March 7, 2026, and (ii) 6,250 shares of restricted stock that vest on March 9, 2025.

SEC source: 0001415889-24-014326 · form4-05232024_090535.xml · nonDerivative · entry 3

Brisbin Thomas Donald · CIK 0001395188 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 419,175

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: Includes (i) 11,667 shares of restricted stock that vest in two substantially equal installments on each of March 7, 2025 and March 7, 2026, and (ii) 6,250 shares of restricted stock that vest on March 9, 2025.

SEC source: 0001415889-24-014326 · form4-05232024_090535.xml · derivative · entry 5

Brisbin Thomas Donald · CIK 0001395188 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,485

Underlying: Common Stock · 2,742 shares

Expires 2024-06-06

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_date: Stock options granted under the Willdan Group, Inc. Amended and Restated 2008 Performance Incentive Plan, which vested in three equal installments on each of June 6, 2015, June 6, 2016 and June 6, 2017.

SEC source: 0001415889-24-014326 · form4-05232024_090535.xml · nonDerivative · entry 2

Brisbin Thomas Donald · CIK 0001395188 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 413,908

F2 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $32.12 to $32.15, inclusive. The reporting person undertakes to provide to Willdan Group, Inc., any security holder of Willdan Group, Inc., 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.

F1 · balance_after: Includes (i) 11,667 shares of restricted stock that vest in two substantially equal installments on each of March 7, 2025 and March 7, 2026, and (ii) 6,250 shares of restricted stock that vest on March 9, 2025.

SEC source: 0001415889-24-014326 · form4-05232024_090535.xml · nonDerivative · entry 1

Brisbin Thomas Donald · CIK 0001395188 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 416,650

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: Includes (i) 11,667 shares of restricted stock that vest in two substantially equal installments on each of March 7, 2025 and March 7, 2026, and (ii) 6,250 shares of restricted stock that vest on March 9, 2025.

SEC source: 0001415889-24-014011 · form4-05212024_100518.xml · derivative · entry 3

Brisbin Thomas Donald · CIK 0001395188 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 28,227

Underlying: Common Stock · 14,426 shares

Expires 2024-06-06

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_date: Stock options granted under the Willdan Group, Inc. Amended and Restated 2008 Performance Incentive Plan, which vested in three equal installments on each of June 6, 2015, June 6, 2016 and June 6, 2017.

SEC source: 0001415889-24-014011 · form4-05212024_100518.xml · nonDerivative · entry 2

Brisbin Thomas Donald · CIK 0001395188 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 413,908

F2 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $32.05 to $32.22, inclusive. The reporting person undertakes to provide to Willdan Group, Inc., any security holder of Willdan Group, Inc., 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.

F1 · balance_after: Includes (i) 11,667 shares of restricted stock that vest in two substantially equal installments on each of March 7, 2025 and March 7, 2026, and (ii) 6,250 shares of restricted stock that vest on March 9, 2025.

SEC source: 0001415889-24-014011 · form4-05212024_100518.xml · nonDerivative · entry 1

Brisbin Thomas Donald · CIK 0001395188 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 428,334

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: Includes (i) 11,667 shares of restricted stock that vest in two substantially equal installments on each of March 7, 2025 and March 7, 2026, and (ii) 6,250 shares of restricted stock that vest on March 9, 2025.

SEC source: 0001654954-24-006531 · section16.xml · nonDerivative · entry 3

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,510,430

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $32.00 to $32.07, 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: 0001415889-24-013794 · form4-05202024_090524.xml · derivative · entry 3

Brisbin Thomas Donald · CIK 0001395188 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 42,653

Underlying: Common Stock · 7,347 shares

Expires 2024-06-06

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_date: Stock options granted under the Willdan Group, Inc. Amended and Restated 2008 Performance Incentive Plan, which vested in three equal installments on each of June 6, 2015, June 6, 2016 and June 6, 2017.

SEC source: 0001415889-24-013794 · form4-05202024_090524.xml · nonDerivative · entry 2

Brisbin Thomas Donald · CIK 0001395188 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 413,908

F2 · price: The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $32.00 to $32.08, inclusive. The reporting person undertakes to provide to Willdan Group, Inc., any security holder of Willdan Group, Inc., 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.

F1 · balance_after: Includes (i) 11,667 shares of restricted stock that vest in two substantially equal installments on each of March 7, 2025 and March 7, 2026, and (ii) 6,250 shares of restricted stock that vest on March 9, 2025.

SEC source: 0001415889-24-013794 · form4-05202024_090524.xml · nonDerivative · entry 1

Brisbin Thomas Donald · CIK 0001395188 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 421,255

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: Includes (i) 11,667 shares of restricted stock that vest in two substantially equal installments on each of March 7, 2025 and March 7, 2026, and (ii) 6,250 shares of restricted stock that vest on March 9, 2025.