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These shares were sold in multiple transactions at prices ranging from $108.16 to $109.15, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 1,781 shares of restricted stock that vest on June 11, 2026, (ii) 1,124 shares of restricted stock that vest on June 12, 2026, and (iii) 5,834 shares of restricted stock that vest on March 7,2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":131284,"source":{"system":"sec-edgar","filing":"0001415889-25-023043","document":"form4-08262025_090801.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588925023043/form4-08262025_090801.xml","form_type":"4"}},{"id":1055481,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-08-26T21:39:04.000Z","date":"2025-08-22","kind":"sale","planned":false,"acquired":false,"shares":8974,"price":107.65,"value":966051.1,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $107.16 to $108.13, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 1,781 shares of restricted stock that vest on June 11, 2026, (ii) 1,124 shares of restricted stock that vest on June 12, 2026, and (iii) 5,834 shares of restricted stock that vest on March 7,2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":156272,"source":{"system":"sec-edgar","filing":"0001415889-25-023043","document":"form4-08262025_090801.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588925023043/form4-08262025_090801.xml","form_type":"4"}},{"id":1055480,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-08-26T21:39:04.000Z","date":"2025-08-22","kind":"sale","planned":false,"acquired":false,"shares":7520,"price":106.68,"value":802233.6,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $106.12 to $107.04, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 1,781 shares of restricted stock that vest on June 11, 2026, (ii) 1,124 shares of restricted stock that vest on June 12, 2026, and (iii) 5,834 shares of restricted stock that vest on March 7,2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":165246,"source":{"system":"sec-edgar","filing":"0001415889-25-023043","document":"form4-08262025_090801.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588925023043/form4-08262025_090801.xml","form_type":"4"}},{"id":1055479,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-08-26T21:39:04.000Z","date":"2025-08-22","kind":"sale","planned":false,"acquired":false,"shares":4910,"price":105.36,"value":517317.6,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $105.1 to $106.01, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 1,781 shares of restricted stock that vest on June 11, 2026, (ii) 1,124 shares of restricted stock that vest on June 12, 2026, and (iii) 5,834 shares of restricted stock that vest on March 7,2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":172766,"source":{"system":"sec-edgar","filing":"0001415889-25-023043","document":"form4-08262025_090801.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588925023043/form4-08262025_090801.xml","form_type":"4"}},{"id":1055478,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-08-26T21:39:04.000Z","date":"2025-08-22","kind":"sale","planned":false,"acquired":false,"shares":10615,"price":104.58,"value":1110116.7,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $104.06 to $105.01, 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 (1), footnote (3), footnote (4), footnote (5), footnote (6), footnote (7) and footnote (8)."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 1,781 shares of restricted stock that vest on June 11, 2026, (ii) 1,124 shares of restricted stock that vest on June 12, 2026, and (iii) 5,834 shares of restricted stock that vest on March 7,2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":177676,"source":{"system":"sec-edgar","filing":"0001415889-25-023043","document":"form4-08262025_090801.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588925023043/form4-08262025_090801.xml","form_type":"4"}},{"id":1056632,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-08-25T21:38:54.000Z","date":"2025-08-21","kind":"sale","planned":false,"acquired":false,"shares":100,"price":106.34,"value":10634.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F7","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at $106.34."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 1,781 shares of restricted stock that vest on June 11, 2026, (ii) 1,124 shares of restricted stock that vest on June 12, 2026, and (iii) 5,834 shares of restricted stock that vest on March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":188291,"source":{"system":"sec-edgar","filing":"0001415889-25-022939","document":"form4-08252025_090850.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588925022939/form4-08252025_090850.xml","form_type":"4"}},{"id":1056631,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-08-25T21:38:54.000Z","date":"2025-08-21","kind":"sale","planned":false,"acquired":false,"shares":33380,"price":105.91,"value":3535275.8,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $105.34 to $106.28, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 1,781 shares of restricted stock that vest on June 11, 2026, (ii) 1,124 shares of restricted stock that vest on June 12, 2026, and (iii) 5,834 shares of restricted stock that vest on March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":188391,"source":{"system":"sec-edgar","filing":"0001415889-25-022939","document":"form4-08252025_090850.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588925022939/form4-08252025_090850.xml","form_type":"4"}},{"id":1056630,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-08-25T21:38:54.000Z","date":"2025-08-21","kind":"sale","planned":false,"acquired":false,"shares":33950,"price":104.66,"value":3553207.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $104.29 to $105.28, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 1,781 shares of restricted stock that vest on June 11, 2026, (ii) 1,124 shares of restricted stock that vest on June 12, 2026, and (iii) 5,834 shares of restricted stock that vest on March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":221771,"source":{"system":"sec-edgar","filing":"0001415889-25-022939","document":"form4-08252025_090850.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588925022939/form4-08252025_090850.xml","form_type":"4"}},{"id":1056629,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-08-25T21:38:54.000Z","date":"2025-08-21","kind":"sale","planned":false,"acquired":false,"shares":33464,"price":103.95,"value":3478582.8,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $103.29 to $104.28, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 1,781 shares of restricted stock that vest on June 11, 2026, (ii) 1,124 shares of restricted stock that vest on June 12, 2026, and (iii) 5,834 shares of restricted stock that vest on March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":255721,"source":{"system":"sec-edgar","filing":"0001415889-25-022939","document":"form4-08252025_090850.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588925022939/form4-08252025_090850.xml","form_type":"4"}},{"id":1056628,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-08-25T21:38:54.000Z","date":"2025-08-21","kind":"sale","planned":false,"acquired":false,"shares":17106,"price":103.01,"value":1762089.06,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $102.29 to $103.28, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 1,781 shares of restricted stock that vest on June 11, 2026, (ii) 1,124 shares of restricted stock that vest on June 12, 2026, and (iii) 5,834 shares of restricted stock that vest on March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":289185,"source":{"system":"sec-edgar","filing":"0001415889-25-022939","document":"form4-08252025_090850.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588925022939/form4-08252025_090850.xml","form_type":"4"}},{"id":1056627,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-08-25T21:38:54.000Z","date":"2025-08-21","kind":"sale","planned":false,"acquired":false,"shares":7000,"price":101.87,"value":713090.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $101.24 to $102.22, 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 (1), footnote (3), footnote (4), footnote (5), footnote (6), and footnote (7)."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 1,781 shares of restricted stock that vest on June 11, 2026, (ii) 1,124 shares of restricted stock that vest on June 12, 2026, and (iii) 5,834 shares of restricted stock that vest on March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":306291,"source":{"system":"sec-edgar","filing":"0001415889-25-022939","document":"form4-08252025_090850.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588925022939/form4-08252025_090850.xml","form_type":"4"}},{"id":1059088,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-08-21T21:30:21.000Z","date":"2025-08-20","kind":"sale","planned":false,"acquired":false,"shares":7405,"price":104.19,"value":771526.95,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $104.00 to $104.51, 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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 1,781 shares of restricted stock that vest on June 11, 2026, (ii) 1,124 shares of restricted stock that vest on June 12, 2026, and (iii) 5,834 shares of restricted stock that vest on March 7,2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":313291,"source":{"system":"sec-edgar","filing":"0001415889-25-022636","document":"form4-08212025_090817.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588925022636/form4-08212025_090817.xml","form_type":"4"}},{"id":1060057,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Options (Right to Buy)","published_at":"2025-08-20T21:39:09.000Z","date":"2025-08-18","kind":"exercise","planned":false,"acquired":false,"shares":5082,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F9","text":"Stock options granted under the Willdan Group, Inc. Amended and Restated 2008 Performance Incentive Plan, which vested in three equal installments on each of November 3, 2017, November 3, 2018 and November 3, 2019."}],"balance_after":94918,"derivative":{"exercise_price":16.27,"exercise_date":"2017-11-03","expiration_date":"2026-11-03","underlying":"Common Stock","underlying_shares":5082},"source":{"system":"sec-edgar","filing":"0001415889-25-022512","document":"form4-08202025_090805.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588925022512/form4-08202025_090805.xml","form_type":"4"}},{"id":1060056,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-08-20T21:39:09.000Z","date":"2025-08-18","kind":"sale","planned":false,"acquired":false,"shares":7206,"price":111.21,"value":801379.26,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F8","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $111.00 to $111.44, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 1,781 shares of restricted stock that vest on June 11, 2026, (ii) 1,124 shares of restricted stock that vest on June 12, 2026, and (iii)  5,834 shares of restricted stock that vest on March 7,2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":320696,"source":{"system":"sec-edgar","filing":"0001415889-25-022512","document":"form4-08202025_090805.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588925022512/form4-08202025_090805.xml","form_type":"4"}},{"id":1060055,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-08-20T21:39:09.000Z","date":"2025-08-18","kind":"sale","planned":false,"acquired":false,"shares":26258,"price":110.51,"value":2901771.58,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F7","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $110.00 to $110.99, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 1,781 shares of restricted stock that vest on June 11, 2026, (ii) 1,124 shares of restricted stock that vest on June 12, 2026, and (iii)  5,834 shares of restricted stock that vest on March 7,2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":327902,"source":{"system":"sec-edgar","filing":"0001415889-25-022512","document":"form4-08202025_090805.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588925022512/form4-08202025_090805.xml","form_type":"4"}},{"id":1060054,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-08-20T21:39:09.000Z","date":"2025-08-18","kind":"sale","planned":false,"acquired":false,"shares":58303,"price":109.51,"value":6384761.53,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price reported in Column 4 is the weighted average price. 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These shares were sold in multiple transactions at prices ranging from $108.00 to $108.99, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 1,781 shares of restricted stock that vest on June 11, 2026, (ii) 1,124 shares of restricted stock that vest on June 12, 2026, and (iii)  5,834 shares of restricted stock that vest on March 7,2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":412463,"source":{"system":"sec-edgar","filing":"0001415889-25-022512","document":"form4-08202025_090805.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588925022512/form4-08202025_090805.xml","form_type":"4"}},{"id":1060052,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-08-20T21:39:09.000Z","date":"2025-08-18","kind":"sale","planned":false,"acquired":false,"shares":300,"price":113.01,"value":33903.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at $113.01."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 1,781 shares of restricted stock that vest on June 11, 2026, (ii) 1,124 shares of restricted stock that vest on June 12, 2026, and (iii)  5,834 shares of restricted stock that vest on March 7,2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":445696,"source":{"system":"sec-edgar","filing":"0001415889-25-022512","document":"form4-08202025_090805.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588925022512/form4-08202025_090805.xml","form_type":"4"}},{"id":1060051,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-08-20T21:39:09.000Z","date":"2025-08-18","kind":"sale","planned":false,"acquired":false,"shares":4782,"price":112.3,"value":537018.6,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $112.00 to $112.73, 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 (3), footnote (4), footnote (5), footnote (6), footnote (7) and footnote (8)."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 1,781 shares of restricted stock that vest on June 11, 2026, (ii) 1,124 shares of restricted stock that vest on June 12, 2026, and (iii)  5,834 shares of restricted stock that vest on March 7,2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":445996,"source":{"system":"sec-edgar","filing":"0001415889-25-022512","document":"form4-08202025_090805.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588925022512/form4-08202025_090805.xml","form_type":"4"}},{"id":1060050,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-08-20T21:39:09.000Z","date":"2025-08-18","kind":"exercise","planned":false,"acquired":true,"shares":5082,"price":16.27,"value":82684.14,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 1,781 shares of restricted stock that vest on June 11, 2026, (ii) 1,124 shares of restricted stock that vest on June 12, 2026, and (iii)  5,834 shares of restricted stock that vest on March 7,2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":450778,"source":{"system":"sec-edgar","filing":"0001415889-25-022512","document":"form4-08202025_090805.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588925022512/form4-08202025_090805.xml","form_type":"4"}},{"id":1060049,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-08-20T21:39:09.000Z","date":"2025-08-18","kind":"grant","planned":false,"acquired":true,"shares":21461,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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 effective on August 18, 2025, resulting in the immediate vesting of the restricted stock units as to 21,461 shares of Common Stock."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 1,781 shares of restricted stock that vest on June 11, 2026, (ii) 1,124 shares of restricted stock that vest on June 12, 2026, and (iii)  5,834 shares of restricted stock that vest on March 7,2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":445696,"source":{"system":"sec-edgar","filing":"0001415889-25-022512","document":"form4-08202025_090805.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588925022512/form4-08202025_090805.xml","form_type":"4"}},{"id":1112990,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-06-12T21:56:16.000Z","date":"2025-06-11","kind":"grant","planned":false,"acquired":true,"shares":1781,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares of restricted stock awarded to the Reporting Person by the Issuer on June 11, 2025, which vest on June 11, 2026."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 2,248 shares of restricted stock that vest in two substantially equal installments on each of June 12, 2025 and June 12, 2026 and (ii) 5,834 shares of restricted stock that vest on March 7, 2026."}],"balance_after":424235,"source":{"system":"sec-edgar","filing":"0001415889-25-017036","document":"form4-06122025_090613.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588925017036/form4-06122025_090613.xml","form_type":"4"}},{"id":1130342,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Options (Right to Buy)","published_at":"2025-05-29T21:31:08.000Z","date":"2025-05-27","kind":"exercise","planned":false,"acquired":false,"shares":22459,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Stock options granted under the Willdan Group, Inc. 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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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes (i) 2,248 shares of restricted stock that vest in two substantially equal installments on each of June 12, 2025 and June 12, 2026 and (ii) 5,834 shares of restricted stock that vest on March 7, 2026."}],"balance_after":422454,"source":{"system":"sec-edgar","filing":"0001415889-25-014748","document":"form4-05282025_090550.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588925014748/form4-05282025_090550.xml","form_type":"4"}},{"id":1131640,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-05-28T21:45:53.000Z","date":"2025-05-23","kind":"exercise","planned":false,"acquired":true,"shares":1626,"price":13.91,"value":22617.66,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes (i) 2,248 shares of restricted stock that vest in two substantially equal installments on each of June 12, 2025 and June 12, 2026 and (ii) 5,834 shares of restricted stock that vest on March 7, 2026."}],"balance_after":424080,"source":{"system":"sec-edgar","filing":"0001415889-25-014748","document":"form4-05282025_090550.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588925014748/form4-05282025_090550.xml","form_type":"4"}},{"id":1133091,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Options (Right to Buy)","published_at":"2025-05-27T21:39:17.000Z","date":"2025-05-22","kind":"exercise","planned":false,"acquired":false,"shares":5915,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Stock options granted under the Willdan Group, Inc. 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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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"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."}],"balance_after":413908,"source":{"system":"sec-edgar","filing":"0001415889-24-014326","document":"form4-05232024_090535.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588924014326/form4-05232024_090535.xml","form_type":"4"}},{"id":1503353,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2024-05-23T21:31:46.000Z","date":"2024-05-22","kind":"exercise","planned":false,"acquired":true,"shares":5267,"price":7.13,"value":37553.71,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"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."}],"balance_after":419175,"source":{"system":"sec-edgar","filing":"0001415889-24-014326","document":"form4-05232024_090535.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588924014326/form4-05232024_090535.xml","form_type":"4"}},{"id":1503352,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2024-05-23T21:31:46.000Z","date":"2024-05-21","kind":"sale","planned":false,"acquired":false,"shares":2742,"price":32.12,"value":88073.04,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is the weighted average price. 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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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"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."}],"balance_after":413908,"source":{"system":"sec-edgar","filing":"0001415889-24-014326","document":"form4-05232024_090535.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588924014326/form4-05232024_090535.xml","form_type":"4"}},{"id":1503351,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2024-05-23T21:31:46.000Z","date":"2024-05-21","kind":"exercise","planned":false,"acquired":true,"shares":2742,"price":7.13,"value":19550.46,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"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."}],"balance_after":416650,"source":{"system":"sec-edgar","filing":"0001415889-24-014326","document":"form4-05232024_090535.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588924014326/form4-05232024_090535.xml","form_type":"4"}},{"id":1506825,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Options (Right to Buy)","published_at":"2024-05-21T22:30:27.000Z","date":"2024-05-20","kind":"exercise","planned":false,"acquired":false,"shares":14426,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"Stock options granted under the Willdan Group, Inc. 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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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"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."}],"balance_after":413908,"source":{"system":"sec-edgar","filing":"0001415889-24-013794","document":"form4-05202024_090524.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588924013794/form4-05202024_090524.xml","form_type":"4"}},{"id":1508651,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2024-05-20T21:35:33.000Z","date":"2024-05-16","kind":"exercise","planned":false,"acquired":true,"shares":7347,"price":7.13,"value":52384.11,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"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."}],"balance_after":421255,"source":{"system":"sec-edgar","filing":"0001415889-24-013794","document":"form4-05202024_090524.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588924013794/form4-05202024_090524.xml","form_type":"4"}},{"id":1543617,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2024-04-10T21:32:07.000Z","date":"2024-03-20","kind":"grant","planned":false,"acquired":true,"shares":15750,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents performance-based restricted stock units previously granted to the Reporting Person by the Issuer on March 7, 2023. The performance conditions applicable to the award were determined to have been satisfied by the Issuer's Compensation Committee on March 20, 2024, resulting in the immediate vesting of the restricted stock units as to 15,750 shares of Common Stock."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"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, (ii) 6,250 shares of restricted stock that vest on March 9, 2025, and (iii) 538 shares of Common Stock purchased under the Amended and Restated Willdan Group, Inc. 2006 Employee Stock Purchase Plan on December 31, 2023."}],"balance_after":413908,"source":{"system":"sec-edgar","filing":"0001415889-24-010658","document":"form4-04102024_090400.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588924010658/form4-04102024_090400.xml","form_type":"4"}},{"id":1795073,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"CHIEF EXECUTIVE OFFICER","other_text":"CHAIRMAN OF THE BOARD"}}],"security":"Common Stock","published_at":"2023-08-28T22:14:50.000Z","date":"2023-08-24","kind":"sale","planned":false,"acquired":false,"shares":126,"price":24.7,"value":3112.2,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $24.68 to $24.75, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"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."}],"balance_after":397620,"source":{"system":"sec-edgar","filing":"0001415889-23-012720","document":"form4-08282023_100841.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588923012720/form4-08282023_100841.xml","form_type":"4"}},{"id":1795072,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"CHIEF EXECUTIVE OFFICER","other_text":"CHAIRMAN OF THE BOARD"}}],"security":"Common Stock","published_at":"2023-08-28T22:14:50.000Z","date":"2023-08-24","kind":"sale","planned":false,"acquired":false,"shares":1937,"price":24.34,"value":47146.58,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $23.67 to $24.65, 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)."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"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."}],"balance_after":397746,"source":{"system":"sec-edgar","filing":"0001415889-23-012720","document":"form4-08282023_100841.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588923012720/form4-08282023_100841.xml","form_type":"4"}},{"id":1797485,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"CHIEF EXECUTIVE OFFICER","other_text":"CHAIRMAN OF THE BOARD"}}],"security":"Common Stock","published_at":"2023-08-24T21:40:22.000Z","date":"2023-08-23","kind":"sale","planned":false,"acquired":false,"shares":1003,"price":23.81,"value":23881.43,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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\nof the performance-based restricted stock units on August 21, 2023."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $23.65 to $24.15, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"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\n(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."}],"balance_after":399683,"source":{"system":"sec-edgar","filing":"0001415889-23-012616","document":"form4-08242023_090816.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588923012616/form4-08242023_090816.xml","form_type":"4"}},{"id":1797484,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"CHIEF EXECUTIVE OFFICER","other_text":"CHAIRMAN OF THE BOARD"}}],"security":"Common Stock","published_at":"2023-08-24T21:40:22.000Z","date":"2023-08-23","kind":"sale","planned":false,"acquired":false,"shares":1347,"price":23.29,"value":31371.63,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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\nof the performance-based restricted stock units on August 21, 2023."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $22.65 to $23.64, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"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\n(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."}],"balance_after":400686,"source":{"system":"sec-edgar","filing":"0001415889-23-012616","document":"form4-08242023_090816.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588923012616/form4-08242023_090816.xml","form_type":"4"}},{"id":1797483,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"CHIEF EXECUTIVE OFFICER","other_text":"CHAIRMAN OF THE BOARD"}}],"security":"Common Stock","published_at":"2023-08-24T21:40:22.000Z","date":"2023-08-22","kind":"sale","planned":false,"acquired":false,"shares":2442,"price":22.82,"value":55726.44,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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\nof the performance-based restricted stock units on August 21, 2023."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"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)."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"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\n(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."}],"balance_after":402033,"source":{"system":"sec-edgar","filing":"0001415889-23-012616","document":"form4-08242023_090816.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588923012616/form4-08242023_090816.xml","form_type":"4"}},{"id":1799494,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"CHIEF EXECUTIVE OFFICER","other_text":"CHAIRMAN OF THE BOARD"}}],"security":"Common Stock","published_at":"2023-08-22T22:12:14.000Z","date":"2023-08-21","kind":"grant","planned":false,"acquired":true,"shares":13648,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents performance-based restricted stock units previously granted to the Reporting Person by the Issuer on August 2, 2022. The performance conditions\napplicable 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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 823 shares of Common Stock purchased under the Amended and Restated Willdan Group, Inc. 2006 Employee Stock Purchase Plan on June 30, 2023."}],"balance_after":404475,"source":{"system":"sec-edgar","filing":"0001415889-23-012513","document":"form4-08222023_100807.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588923012513/form4-08222023_100807.xml","form_type":"4"}},{"id":1953787,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"CHIEF EXECUTIVE OFFICER","other_text":"CHAIRMAN OF THE BOARD"}}],"security":"Common Stock","published_at":"2023-03-15T00:15:31.000Z","date":"2023-03-13","kind":"sale","acquired":false,"shares":999,"price":16.77,"value":16753.23,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"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."}],"balance_after":390004,"source":{"system":"sec-edgar","filing":"0001415889-23-004912","document":"form4-03152023_120322.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588923004912/form4-03152023_120322.xml","form_type":"4"}},{"id":1953786,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"CHIEF EXECUTIVE OFFICER","other_text":"CHAIRMAN OF THE BOARD"}}],"security":"Common Stock","published_at":"2023-03-15T00:15:31.000Z","date":"2023-03-13","kind":"sale","acquired":false,"shares":1607,"price":16.15,"value":25953.05,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"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)."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"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."}],"balance_after":391003,"source":{"system":"sec-edgar","filing":"0001415889-23-004912","document":"form4-03152023_120322.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588923004912/form4-03152023_120322.xml","form_type":"4"}},{"id":1956472,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"CHIEF EXECUTIVE OFFICER","other_text":"CHAIRMAN OF THE BOARD"}}],"security":"Common Stock","published_at":"2023-03-13T22:48:17.000Z","date":"2023-03-10","kind":"sale","acquired":false,"shares":235,"price":16.96,"value":3985.6,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"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."}],"balance_after":392610,"source":{"system":"sec-edgar","filing":"0001415889-23-004811","document":"form4-03132023_100311.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588923004811/form4-03132023_100311.xml","form_type":"4"}},{"id":1956471,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"CHIEF EXECUTIVE OFFICER","other_text":"CHAIRMAN OF THE BOARD"}}],"security":"Common Stock","published_at":"2023-03-13T22:48:17.000Z","date":"2023-03-10","kind":"sale","acquired":false,"shares":1060,"price":15.78,"value":16726.8,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"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."}],"balance_after":392845,"source":{"system":"sec-edgar","filing":"0001415889-23-004811","document":"form4-03132023_100311.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588923004811/form4-03132023_100311.xml","form_type":"4"}},{"id":1956470,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"CHIEF EXECUTIVE OFFICER","other_text":"CHAIRMAN OF THE BOARD"}}],"security":"Common Stock","published_at":"2023-03-13T22:48:17.000Z","date":"2023-03-10","kind":"sale","acquired":false,"shares":1194,"price":15.21,"value":18160.74,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"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)."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"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."}],"balance_after":393905,"source":{"system":"sec-edgar","filing":"0001415889-23-004811","document":"form4-03132023_100311.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588923004811/form4-03132023_100311.xml","form_type":"4"}},{"id":1958486,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"CHIEF EXECUTIVE OFFICER","other_text":"CHAIRMAN OF THE BOARD"}}],"security":"Common Stock","published_at":"2023-03-10T23:09:22.000Z","date":"2023-03-09","kind":"tax_withholding","acquired":false,"shares":3147,"price":17.05,"value":53656.35,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"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."}],"balance_after":395099,"source":{"system":"sec-edgar","filing":"0001415889-23-004690","document":"form4-03102023_110315.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588923004690/form4-03102023_110315.xml","form_type":"4"}},{"id":1958485,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"CHIEF EXECUTIVE OFFICER","other_text":"CHAIRMAN OF THE BOARD"}}],"security":"Common Stock","published_at":"2023-03-10T23:09:22.000Z","date":"2023-03-09","kind":"sale","acquired":false,"shares":2681,"price":17.03,"value":45657.43,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"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."}],"balance_after":398246,"source":{"system":"sec-edgar","filing":"0001415889-23-004690","document":"form4-03102023_110315.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588923004690/form4-03102023_110315.xml","form_type":"4"}},{"id":1962754,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"CHIEF EXECUTIVE OFFICER","other_text":"CHAIRMAN OF THE BOARD"}}],"security":"Common Stock","published_at":"2023-03-08T23:36:55.000Z","date":"2023-03-07","kind":"grant","acquired":true,"shares":17500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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,\nMarch 7, 2025 and March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 238 shares of Common Stock purchased under the Amended and Restated Willdan Group, Inc. 2006 Employee Stock Purchase Plan on December 31, 2022."}],"balance_after":400927,"source":{"system":"sec-edgar","filing":"0001415889-23-004532","document":"form4-03082023_110347.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588923004532/form4-03082023_110347.xml","form_type":"4"}},{"id":2158218,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"CHIEF EXECUTIVE OFFICER","other_text":"CHAIRMAN OF THE BOARD"}}],"security":"Common Stock","published_at":"2022-09-15T21:49:15.000Z","date":"2022-09-14","kind":"disposition_to_issuer","acquired":false,"shares":10000,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"On September 14, 2022, the Reporting Person and the Issuer mutually agreed to cancel 10,000 shares of restricted stock, which were previously awarded to the Reporting Person by the Issuer on March 8, 2022, and which were scheduled to vest in one installment on March 8, 2023, subject to the Reporting Person's continued service to the Issuer through such date. The Reporting Person received a new grant of 4,000 performance-based restricted stock units as consideration for such cancellation. The cancellation of shares of restricted stock and subsequent new grant of performance-based restricted stock units were approved by the Compensation Committee of the Issuer's Board of Directors on September 14, 2022."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 18,750 shares of restricted stock that vest in three substantially equal installments on each of March 9, 2023, March 9, 2024 and March 9, 2025 and (ii) 13,751 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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 533 shares of Common Stock purchased under the Amended and Restated Willdan Group, Inc. 2006 Employee Stock Purchase Plan on June 30, 2022."}],"balance_after":383189,"source":{"system":"sec-edgar","filing":"0001415889-22-009687","document":"form4-09152022_020905.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588922009687/form4-09152022_020905.xml","form_type":"4"}},{"id":2314035,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"CHIEF EXECUTIVE OFFICER","other_text":"CHAIRMAN OF THE BOARD"}}],"security":"Common Stock","published_at":"2022-03-30T21:36:36.000Z","date":"2022-03-28","kind":"tax_withholding","acquired":false,"shares":4507,"price":30.84,"value":138995.88,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F5","text":"Represents shares of the Issuer's Common Stock withheld for tax withholding purposes in connection with the vesting of the performance-based restricted stock units referenced in footnote (3)."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 18,750 shares of restricted stock that vest in three substantially equal installments on each of March 9, 2023, March 9, 2024 and March 9, 2025 and (ii) 23,751 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."}],"balance_after":392656,"source":{"system":"sec-edgar","filing":"0001415889-22-003483","document":"form4-03302022_020312.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588922003483/form4-03302022_020312.xml","form_type":"4"}},{"id":2314034,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"CHIEF EXECUTIVE OFFICER","other_text":"CHAIRMAN OF THE BOARD"}}],"security":"Common Stock","published_at":"2022-03-30T21:36:36.000Z","date":"2022-03-28","kind":"tax_withholding","acquired":false,"shares":4638,"price":30.84,"value":143035.92,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Represents shares of the Issuer's Common Stock withheld for tax withholding purposes in connection with the vesting of the performance-based restricted stock units referenced in footnote (1)."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 18,750 shares of restricted stock that vest in three substantially equal installments on each of March 9, 2023, March 9, 2024 and March 9, 2025 and (ii) 23,751 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."}],"balance_after":397163,"source":{"system":"sec-edgar","filing":"0001415889-22-003483","document":"form4-03302022_020312.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588922003483/form4-03302022_020312.xml","form_type":"4"}},{"id":2314033,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"CHIEF EXECUTIVE OFFICER","other_text":"CHAIRMAN OF THE BOARD"}}],"security":"Common Stock","published_at":"2022-03-30T21:36:36.000Z","date":"2022-03-28","kind":"grant","acquired":true,"shares":8950,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F3","text":"Represents performance-based restricted stock units previously granted to the Reporting Person by the Issuer on March 2, 2020. The performance conditions applicable to the award were determined to have been satisfied by the Issuer's Compensation Committee on March 28, 2022, resulting in the immediate vesting of the restricted stock units as to 8,950 shares of Common Stock."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 18,750 shares of restricted stock that vest in three substantially equal installments on each of March 9, 2023, March 9, 2024 and March 9, 2025 and (ii) 23,751 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."}],"balance_after":401801,"source":{"system":"sec-edgar","filing":"0001415889-22-003483","document":"form4-03302022_020312.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588922003483/form4-03302022_020312.xml","form_type":"4"}},{"id":2314032,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":10208,"kind":"person","name":"Brisbin Thomas Donald","position":1,"cik":"0001395188","reported_name":"Brisbin Thomas Donald","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"CHIEF EXECUTIVE OFFICER","other_text":"CHAIRMAN OF THE BOARD"}}],"security":"Common Stock","published_at":"2022-03-30T21:36:36.000Z","date":"2022-03-28","kind":"grant","acquired":true,"shares":9208,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents performance-based restricted stock units previously granted to the Reporting Person by the Issuer on March 6, 2018. The performance conditions applicable to the award were determined to have been satisfied by the Issuer's Compensation Committee on March 28, 2022, resulting in the immediate vesting of the restricted stock units as to 9,208 shares of Common Stock."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 18,750 shares of restricted stock that vest in three substantially equal installments on each of March 9, 2023, March 9, 2024 and March 9, 2025 and (ii) 23,751 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."}],"balance_after":392851,"source":{"system":"sec-edgar","filing":"0001415889-22-003483","document":"form4-03302022_020312.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588922003483/form4-03302022_020312.xml","form_type":"4"}}],"next_cursor":"2022-03-30T21:36:36.000000Z,2314032"}