{"transactions":[{"id":732068,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":36809,"kind":"person","name":"Shahidehpour Mohammad","position":1,"cik":"0001640436","reported_name":"Shahidehpour Mohammad","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-06-18T21:11:31.000Z","date":"2026-06-17","kind":"grant","planned":false,"acquired":true,"shares":1241,"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 17, 2026, which vest on June 17, 2027."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 1,241 shares of restricted stock that vest on June 17, 2027."}],"balance_after":15789,"source":{"system":"sec-edgar","filing":"0001640436-26-000002","document":"form4-06182026_090627.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1640436/000164043626000002/form4-06182026_090627.xml","form_type":"4"}},{"id":1113315,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":36809,"kind":"person","name":"Shahidehpour Mohammad","position":1,"cik":"0001640436","reported_name":"Shahidehpour Mohammad","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-06-12T21:48:12.000Z","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 2,248 shares of restricted stock that vest in two substantially equal installments on each of June 12, 2025 and June 12, 2026."}],"balance_after":14548,"source":{"system":"sec-edgar","filing":"0001415889-25-017020","document":"form4-06122025_090608.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1640436/000141588925017020/form4-06122025_090608.xml","form_type":"4"}},{"id":1207743,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":36809,"kind":"person","name":"Shahidehpour Mohammad","position":1,"cik":"0001640436","reported_name":"Shahidehpour Mohammad","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common 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2025."}],"balance_after":15040,"source":{"system":"sec-edgar","filing":"0001415889-24-016727","document":"form4-06132024_100649.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1640436/000141588924016727/form4-06132024_100649.xml","form_type":"4"}},{"id":1482051,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":36809,"kind":"person","name":"Shahidehpour Mohammad","position":1,"cik":"0001640436","reported_name":"Shahidehpour Mohammad","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2024-06-12T21:52:02.000Z","date":"2024-06-10","kind":"sale","planned":false,"acquired":false,"shares":3000,"price":30.83,"value":92490.0,"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 $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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 1,793 shares of restricted stock that vest on June 7, 2025."}],"balance_after":12792,"source":{"system":"sec-edgar","filing":"0001415889-24-016537","document":"form4-06122024_090659.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1640436/000141588924016537/form4-06122024_090659.xml","form_type":"4"}},{"id":1860469,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":36809,"kind":"person","name":"Shahidehpour Mohammad","position":1,"cik":"0001640436","reported_name":"Shahidehpour Mohammad","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2023-06-09T22:07:28.000Z","date":"2023-06-07","kind":"grant","planned":false,"acquired":true,"shares":3585,"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 7, 2023, which vest in two substantially equal installments on each of June 7, 2024 and June 7, 2025."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 1,295 shares of restricted stock that vest on June 9, 2024."}],"balance_after":15792,"source":{"system":"sec-edgar","filing":"0001415889-23-009534","document":"form4-06092023_100621.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1640436/000141588923009534/form4-06092023_100621.xml","form_type":"4"}},{"id":2160138,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":36809,"kind":"person","name":"Shahidehpour Mohammad","position":1,"cik":"0001640436","reported_name":"Shahidehpour Mohammad","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2022-09-13T22:02:34.000Z","date":"2022-09-09","kind":"sale","acquired":false,"shares":2418,"price":20.48,"value":49520.64,"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 $20.23 to $20.62, 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) 892 shares of restricted stock that vest on June 9, 2023 and (ii) 2,589 shares of restricted stock that vest in two substantially equal installments on each of June 9, 2023 and June 9, 2024."}],"balance_after":12207,"source":{"system":"sec-edgar","filing":"0001415889-22-009594","document":"form4-09132022_030922.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1640436/000141588922009594/form4-09132022_030922.xml","form_type":"4"}},{"id":2235879,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, 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installments on each of June 9, 2022 and June 9, 2023."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 829 shares of restricted stock that vest on June 13, 2021, (ii) 1,084 shares of restricted stock that vest on June 13, 2021, (iii) 1,526 shares of restricted stock that vest on June 11, 2021 and (iv) 1,527 shares of restricted stock that vest on June 11, 2022."}],"balance_after":12036,"source":{"system":"sec-edgar","filing":"0001179110-21-006618","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1640436/000117911021006618/edgar.xml","form_type":"4"}},{"id":3110563,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":36809,"kind":"person","name":"Shahidehpour Mohammad","position":1,"cik":"0001640436","reported_name":"Shahidehpour 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These shares were sold in multiple transactions at prices ranging from $22.49 to $22.57, 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 range set forth above."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 491 shares of restricted stock that vest on June 8, 2020, (ii) 1,657  shares of restricted stock that vest in two substantially equal installments on each of June 13, 2020 and June 13, 2021 and (iii) 2,168  shares of restricted stock that vest in two substantially equal installments on each of June 13, 2020 and June 13, 2021."}],"balance_after":7200,"source":{"system":"sec-edgar","filing":"0001179110-20-006320","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1640436/000117911020006320/edgar.xml","form_type":"4"}},{"id":3487766,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":36809,"kind":"person","name":"Shahidehpour Mohammad","position":1,"cik":"0001640436","reported_name":"Shahidehpour Mohammad","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2019-06-17T20:52:37.000Z","date":"2019-06-13","kind":"grant","acquired":true,"shares":2168,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The shares of restricted stock vest in two equal installments on each of June 13, 2020 and June 13, 2021."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 1,657 shares of restricted stock that vest in two substantially equal installments on each of June 13, 2020 and June 13, 2021."}],"balance_after":14310,"source":{"system":"sec-edgar","filing":"0001179110-19-007766","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1640436/000117911019007766/edgar.xml","form_type":"4"}},{"id":3892617,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":36809,"kind":"person","name":"Shahidehpour Mohammad","position":1,"cik":"0001640436","reported_name":"Shahidehpour Mohammad","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2018-06-15T21:08:05.000Z","date":"2018-06-13","kind":"grant","acquired":true,"shares":2485,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The shares vest in three substantially equal installments on each of June 13, 2019, June 13, 2020 and June 13, 2021."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 1,528 shares of restricted stock that vest on June 9, 2019."}],"balance_after":12142,"source":{"system":"sec-edgar","filing":"0001179110-18-008641","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1640436/000117911018008641/edgar.xml","form_type":"4"}},{"id":4285680,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":36809,"kind":"person","name":"Shahidehpour Mohammad","position":1,"cik":"0001640436","reported_name":"Shahidehpour Mohammad","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2017-06-12T17:30:50.000Z","date":"2017-06-08","kind":"grant","acquired":true,"shares":1474,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The shares vest in three substantially equal installments on each of June 8, 2018, June 8, 2019 and June 8, 2020."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 1,200 shares of restricted stock that vest on June 5, 2018 and 4,583 shares of restricted stock that vest in three substantially equal installments on each of June 9, 2017, June 9, 2018 and June 9, 2019."}],"balance_after":9657,"source":{"system":"sec-edgar","filing":"0001179110-17-008871","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1640436/000117911017008871/edgar.xml","form_type":"4"}}]}