{"transactions":[{"id":2111055,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2022-11-19T01:31:54.000Z","date":"2022-11-16","kind":"grant","acquired":true,"shares":1014,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents an award of restricted stock units (RSUs), each unit of which represents a contingent right to receive one share of Tetra Tech common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The RSUs become vested as to 25% of the shares on November 18, 2023, and 25% of the shares on each anniversary date thereafter until fully vested."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The RSUs are exercisable at the time of vesting and do not have a set expiration date."}],"balance_after":1014,"derivative":{"exercise_price":0,"exercise_date":"2023-11-18","underlying":"COMMON STOCK","underlying_shares":1014},"source":{"system":"sec-edgar","filing":"0000831641-22-000084","document":"wf-form4_166882149858230.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164122000084/wf-form4_166882149858230.xml","form_type":"4"}},{"id":2421691,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"COMMON STOCK","published_at":"2022-01-31T23:31:38.000Z","date":"2022-01-29","kind":"tax_withholding","acquired":false,"shares":124,"price":132.61,"value":16443.64,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the number of shares withheld to pay the related tax liability on a total of 250 restricted stock units (RSUs) which vested on 01/29/2022."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The closing trading price of the underlying common stock on 01/28/2022, the day preceding the vest day."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Amount of securities beneficially owned was updated to reflect that 43 shares of common stock were acquired by the Reporting Person on December 15, 2021, pursuant to the Tetra Tech, Inc. Employee Stock Purchase Plan (ESPP)."}],"balance_after":1344,"source":{"system":"sec-edgar","filing":"0000831641-22-000005","document":"wf-form4_164367188336362.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164122000005/wf-form4_164367188336362.xml","form_type":"4"}},{"id":2478125,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"COMMON STOCK","published_at":"2021-12-10T22:15:14.000Z","date":"2021-12-08","kind":"sale","acquired":false,"shares":3633,"price":190,"value":690270.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"All shares sold at an exact price."}],"balance_after":1175,"source":{"system":"sec-edgar","filing":"0000831641-21-000164","document":"wf-form4_163917450054681.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164121000164/wf-form4_163917450054681.xml","form_type":"4"}},{"id":2496762,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2021-11-25T01:01:43.000Z","date":"2021-11-23","kind":"grant","acquired":true,"shares":796,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs become vested as to 25% of the shares on November 18, 2022, and the anniversary of that date going forward until fully vested."}],"balance_after":796,"derivative":{"exercise_price":0,"exercise_date":"2022-11-18","expiration_date":"2025-11-18","underlying":"COMMON STOCK","underlying_shares":796},"source":{"system":"sec-edgar","filing":"0000831641-21-000143","document":"wf-form4_163780208339432.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164121000143/wf-form4_163780208339432.xml","form_type":"4"}},{"id":2496761,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"COMMON STOCK","published_at":"2021-11-25T01:01:43.000Z","date":"2021-11-23","kind":"tax_withholding","acquired":false,"shares":2833,"price":190.38,"value":539346.54,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Represents the combined number of shares withheld to pay the related tax liability on a total of 6,466 performance stock units (PSUs) which vested on November 23, 2021."}],"balance_after":4808,"source":{"system":"sec-edgar","filing":"0000831641-21-000143","document":"wf-form4_163780208339432.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164121000143/wf-form4_163780208339432.xml","form_type":"4"}},{"id":2496760,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"COMMON STOCK","published_at":"2021-11-25T01:01:43.000Z","date":"2021-11-23","kind":"grant","acquired":true,"shares":6466,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Shares acquired pursuant to vesting of performance stock units (PSUs) earned under 2018 Equity Incentive Plan."}],"balance_after":7641,"source":{"system":"sec-edgar","filing":"0000831641-21-000143","document":"wf-form4_163780208339432.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164121000143/wf-form4_163780208339432.xml","form_type":"4"}},{"id":2501710,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2021-11-23T00:43:24.000Z","date":"2021-11-18","kind":"exercise","acquired":false,"shares":308,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"The RSUs become vested as to 25% of the shares on November 18, 2021, and the anniversary of that date going forward until fully vested."}],"balance_after":922,"derivative":{"exercise_price":0,"exercise_date":"2021-11-18","expiration_date":"2024-11-19","underlying":"COMMON STOCK","underlying_shares":308},"source":{"system":"sec-edgar","filing":"0000831641-21-000102","document":"wf-form4_163762819014002.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164121000102/wf-form4_163762819014002.xml","form_type":"4"}},{"id":2501709,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2021-11-23T00:43:24.000Z","date":"2021-11-18","kind":"exercise","acquired":false,"shares":407,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The RSUs become vested as to 25% of the shares on November 18, 2020, and the anniversary of that date going forward until fully vested."}],"balance_after":814,"derivative":{"exercise_price":0,"exercise_date":"2020-11-18","expiration_date":"2023-11-21","underlying":"COMMON STOCK","underlying_shares":407},"source":{"system":"sec-edgar","filing":"0000831641-21-000102","document":"wf-form4_163762819014002.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164121000102/wf-form4_163762819014002.xml","form_type":"4"}},{"id":2501708,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2021-11-23T00:43:24.000Z","date":"2021-11-18","kind":"exercise","acquired":false,"shares":539,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs become vested as to 25% of the shares on November 18, 2019, and the anniversary of that date going forward until fully vested."}],"balance_after":539,"derivative":{"exercise_price":0,"exercise_date":"2019-11-18","expiration_date":"2022-11-18","underlying":"COMMON STOCK","underlying_shares":539},"source":{"system":"sec-edgar","filing":"0000831641-21-000102","document":"wf-form4_163762819014002.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164121000102/wf-form4_163762819014002.xml","form_type":"4"}},{"id":2501707,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"COMMON STOCK","published_at":"2021-11-23T00:43:24.000Z","date":"2021-11-18","kind":"tax_withholding","acquired":false,"shares":551,"price":187.88,"value":103521.88,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents the combined number of shares withheld to pay the related tax liability on a total of 1,254 restricted stock units (RSUs) which vested on 11/18/2021."}],"balance_after":1175,"source":{"system":"sec-edgar","filing":"0000831641-21-000102","document":"wf-form4_163762819014002.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164121000102/wf-form4_163762819014002.xml","form_type":"4"}},{"id":2501706,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"COMMON STOCK","published_at":"2021-11-23T00:43:24.000Z","date":"2021-11-18","kind":"exercise","acquired":true,"shares":308,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The award becomes vested as to 25% of the RSUs on the anniversary of the grant date."}],"balance_after":1726,"source":{"system":"sec-edgar","filing":"0000831641-21-000102","document":"wf-form4_163762819014002.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164121000102/wf-form4_163762819014002.xml","form_type":"4"}},{"id":2501705,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"COMMON STOCK","published_at":"2021-11-23T00:43:24.000Z","date":"2021-11-18","kind":"exercise","acquired":true,"shares":407,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The award becomes vested as to 25% of the RSUs on the anniversary of the grant date."}],"balance_after":1418,"source":{"system":"sec-edgar","filing":"0000831641-21-000102","document":"wf-form4_163762819014002.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164121000102/wf-form4_163762819014002.xml","form_type":"4"}},{"id":2501704,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"COMMON STOCK","published_at":"2021-11-23T00:43:24.000Z","date":"2021-11-18","kind":"exercise","acquired":true,"shares":539,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The award becomes vested as to 25% of the RSUs on the anniversary of the grant date."}],"balance_after":1011,"source":{"system":"sec-edgar","filing":"0000831641-21-000102","document":"wf-form4_163762819014002.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164121000102/wf-form4_163762819014002.xml","form_type":"4"}},{"id":2867727,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"COMMON STOCK","published_at":"2021-02-11T23:26:10.000Z","date":"2021-02-09","kind":"sale","acquired":false,"shares":1200,"price":135.2862,"value":162343.44,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"$135.2862 is an average price. Shares were sold at prices ranging from $135.260 to $135.425 per share."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Amount of securities beneficially owned was updated to reflect that 58 shares of common stock were acquired by the Reporting Person on December 15, 2020, pursuant to the Tetra Tech, Inc. Employee Stock Purchase Plan (ESPP)."}],"balance_after":472,"source":{"system":"sec-edgar","filing":"0000831641-21-000026","document":"wf-form4_161308594742897.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164121000026/wf-form4_161308594742897.xml","form_type":"4"}},{"id":2889332,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2021-02-01T23:37:28.000Z","date":"2021-01-29","kind":"exercise","acquired":false,"shares":250,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"The RSUs became vested as to 25% of the shares on January 29, 2019, and the anniversary of that date going forward until fully vested."}],"balance_after":250,"derivative":{"exercise_price":0,"exercise_date":"2019-01-29","expiration_date":"2022-01-29","underlying":"COMMON STOCK","underlying_shares":250},"source":{"system":"sec-edgar","filing":"0000831641-21-000012","document":"wf-form4_161222262826946.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164121000012/wf-form4_161222262826946.xml","form_type":"4"}},{"id":2889331,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"COMMON STOCK","published_at":"2021-02-01T23:37:28.000Z","date":"2021-01-29","kind":"tax_withholding","acquired":false,"shares":94,"price":121.57,"value":11427.58,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F3","text":"Represents the number of shares withheld to pay the related tax liability on the restricted stock units (RSUs) which vested on 01/29/2021."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The closing trading price of the underlying common stock on 01/29/2021 when the RSUs vested."}],"balance_after":1614,"source":{"system":"sec-edgar","filing":"0000831641-21-000012","document":"wf-form4_161222262826946.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164121000012/wf-form4_161222262826946.xml","form_type":"4"}},{"id":2889330,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"COMMON STOCK","published_at":"2021-02-01T23:37:28.000Z","date":"2021-01-29","kind":"exercise","acquired":true,"shares":250,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Shares were automatically acquired upon the vesting of restricted stock units (RSUs)."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Amount of securities beneficially owned was updated to reflect that 58 shares of common stock were acquired by the Reporting Person on December 15, 2020, pursuant to the Tetra Tech, Inc. Employee Stock Purchase Plan (ESPP)."}],"balance_after":1708,"source":{"system":"sec-edgar","filing":"0000831641-21-000012","document":"wf-form4_161222262826946.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164121000012/wf-form4_161222262826946.xml","form_type":"4"}},{"id":2971990,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2020-11-20T23:08:47.000Z","date":"2020-11-19","kind":"grant","acquired":true,"shares":1230,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The RSUs become vested as to 25% of the shares on November 18, 2021, and the anniversary of that date going forward until fully vested."}],"balance_after":1230,"derivative":{"exercise_price":0,"exercise_date":"2021-11-18","expiration_date":"2024-11-19","underlying":"COMMON STOCK","underlying_shares":1230},"source":{"system":"sec-edgar","filing":"0000831641-20-000137","document":"wf-form4_160591371167335.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164120000137/wf-form4_160591371167335.xml","form_type":"4"}},{"id":2971989,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2020-11-20T23:08:47.000Z","date":"2020-11-18","kind":"exercise","acquired":false,"shares":408,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs become vested as to 25% of the shares on November 18, 2020, and the anniversary of that date going forward until fully vested."}],"balance_after":1221,"derivative":{"exercise_price":0,"exercise_date":"2020-11-18","expiration_date":"2023-11-21","underlying":"COMMON STOCK","underlying_shares":408},"source":{"system":"sec-edgar","filing":"0000831641-20-000137","document":"wf-form4_160591371167335.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164120000137/wf-form4_160591371167335.xml","form_type":"4"}},{"id":2971988,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2020-11-20T23:08:47.000Z","date":"2020-11-18","kind":"exercise","acquired":false,"shares":539,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The RSUs become vested as to 25% of the shares on November 18, 2019, and the anniversary of that date going forward until fully vested."}],"balance_after":1078,"derivative":{"exercise_price":0,"exercise_date":"2019-11-18","expiration_date":"2022-11-18","underlying":"COMMON STOCK","underlying_shares":539},"source":{"system":"sec-edgar","filing":"0000831641-20-000137","document":"wf-form4_160591371167335.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164120000137/wf-form4_160591371167335.xml","form_type":"4"}},{"id":2971987,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"COMMON STOCK","published_at":"2020-11-20T23:08:47.000Z","date":"2020-11-18","kind":"tax_withholding","acquired":false,"shares":310,"price":122,"value":37820.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Represents the number of shares withheld to pay the related tax liability on 947 restricted stock units (RSUs) which vested on 11/18/2020."}],"balance_after":1400,"source":{"system":"sec-edgar","filing":"0000831641-20-000137","document":"wf-form4_160591371167335.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164120000137/wf-form4_160591371167335.xml","form_type":"4"}},{"id":2971986,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"COMMON STOCK","published_at":"2020-11-20T23:08:47.000Z","date":"2020-11-18","kind":"exercise","acquired":true,"shares":408,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":1710,"source":{"system":"sec-edgar","filing":"0000831641-20-000137","document":"wf-form4_160591371167335.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164120000137/wf-form4_160591371167335.xml","form_type":"4"}},{"id":2971985,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"COMMON STOCK","published_at":"2020-11-20T23:08:47.000Z","date":"2020-11-18","kind":"exercise","acquired":true,"shares":539,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":1302,"source":{"system":"sec-edgar","filing":"0000831641-20-000137","document":"wf-form4_160591371167335.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164120000137/wf-form4_160591371167335.xml","form_type":"4"}},{"id":3297274,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2020-01-31T22:35:52.000Z","date":"2020-01-29","kind":"exercise","acquired":false,"shares":250,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The award becomes vested as to 25% of the RSUs on the anniversary of the grant date."}],"balance_after":500,"derivative":{"exercise_price":0,"exercise_date":"2019-01-29","expiration_date":"2022-01-29","underlying":"COMMON STOCK","underlying_shares":250},"source":{"system":"sec-edgar","filing":"0000831641-20-000014","document":"wf-form4_158051013456035.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164120000014/wf-form4_158051013456035.xml","form_type":"4"}},{"id":3297273,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"COMMON STOCK","published_at":"2020-01-31T22:35:52.000Z","date":"2020-01-29","kind":"tax_withholding","acquired":false,"shares":96,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents the shares underlying RSUs which vested on 01/29/2020 and were withheld to pay the related tax liability."}],"balance_after":763,"source":{"system":"sec-edgar","filing":"0000831641-20-000014","document":"wf-form4_158051013456035.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164120000014/wf-form4_158051013456035.xml","form_type":"4"}},{"id":3297272,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"COMMON STOCK","published_at":"2020-01-31T22:35:52.000Z","date":"2020-01-29","kind":"exercise","acquired":true,"shares":250,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Amount of securities beneficially owned was updated to reflect that 96 shares of common stock were acquired by the Reporting Person on December 13, 2019, pursuant to the Tetra Tech, Inc. Employee Stock Purchase Plan (ESPP)."}],"balance_after":859,"source":{"system":"sec-edgar","filing":"0000831641-20-000014","document":"wf-form4_158051013456035.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164120000014/wf-form4_158051013456035.xml","form_type":"4"}},{"id":3361948,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"COMMON STOCK","published_at":"2019-11-22T21:37:37.000Z","date":"2019-11-21","kind":"grant","acquired":true,"shares":1629,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Represents an award of restricted stock units (RSUs), each unit of which represents a contingent right to receive one share of Tetra Tech common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The restricted stock units (RSUs) vest in four equal annual installments beginning on November 18, 2020."}],"balance_after":1629,"derivative":{"exercise_price":0,"exercise_date":"2020-11-18","expiration_date":"2023-11-18","underlying":"COMMON STOCK","underlying_shares":1629},"source":{"system":"sec-edgar","filing":"0000831641-19-000180","document":"wf-form4_157445864207772.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164119000180/wf-form4_157445864207772.xml","form_type":"4"}},{"id":3364854,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2019-11-21T01:24:05.000Z","date":"2019-11-18","kind":"exercise","acquired":true,"shares":539,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Represents an award of restricted stock units (RSUs), each unit of which represents a contingent right to receive one share of Tetra Tech common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The restricted stock units (RSUs) vest in four equal annual installments beginning on November 18, 2019."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The restricted stock units (RSUs) vest in four equal annual installments beginning on November 18, 2019."}],"balance_after":1617,"derivative":{"exercise_price":0,"exercise_date":"2019-11-18","expiration_date":"2022-11-18","underlying":"COMMON STOCK","underlying_shares":539},"source":{"system":"sec-edgar","filing":"0000831641-19-000116","document":"wf-form4_157429942765587.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164119000116/wf-form4_157429942765587.xml","form_type":"4"}},{"id":3364853,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"COMMON STOCK","published_at":"2019-11-21T01:24:05.000Z","date":"2019-11-18","kind":"tax_withholding","acquired":false,"shares":173,"price":87.15,"value":15076.95,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents the number of shares withheld to pay the related tax liability on a total of 539 restricted stock units (RSUs) which vested on 11/18/2019."}],"balance_after":513,"source":{"system":"sec-edgar","filing":"0000831641-19-000116","document":"wf-form4_157429942765587.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164119000116/wf-form4_157429942765587.xml","form_type":"4"}},{"id":3364852,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"COMMON STOCK","published_at":"2019-11-21T01:24:05.000Z","date":"2019-11-18","kind":"exercise","acquired":true,"shares":539,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Represents an award of restricted stock units (RSUs), each unit of which represents a contingent right to receive one share of Tetra Tech common stock."}],"balance_after":686,"source":{"system":"sec-edgar","filing":"0000831641-19-000116","document":"wf-form4_157429942765587.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164119000116/wf-form4_157429942765587.xml","form_type":"4"}},{"id":3681830,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2019-01-31T23:51:23.000Z","date":"2019-01-29","kind":"exercise","acquired":false,"shares":250,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The restricted stock units (RSUs) became vested as to 25% of the shares on January 29, 2019, and on each anniversary of that date until the RSUs are fully vested."}],"balance_after":750,"derivative":{"exercise_price":0,"exercise_date":"2019-01-29","expiration_date":"2022-01-29","underlying":"COMMON STOCK","underlying_shares":250},"source":{"system":"sec-edgar","filing":"0000831641-19-000013","document":"wf-form4_154897866707664.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164119000013/wf-form4_154897866707664.xml","form_type":"4"}},{"id":3681829,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"COMMON STOCK","published_at":"2019-01-31T23:51:23.000Z","date":"2019-01-29","kind":"tax_withholding","acquired":false,"shares":103,"price":48.61,"value":5006.83,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"103 of the shares underlying the RSUs which vested on 01/29/2019 were withheld to pay the related tax liability."}],"balance_after":147,"source":{"system":"sec-edgar","filing":"0000831641-19-000013","document":"wf-form4_154897866707664.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164119000013/wf-form4_154897866707664.xml","form_type":"4"}},{"id":3681828,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"COMMON STOCK","published_at":"2019-01-31T23:51:23.000Z","date":"2019-01-29","kind":"exercise","acquired":true,"shares":250,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":250,"source":{"system":"sec-edgar","filing":"0000831641-19-000013","document":"wf-form4_154897866707664.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164119000013/wf-form4_154897866707664.xml","form_type":"4"}},{"id":3762345,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122284,"kind":"person","name":"O'Rourke Brendan M.","position":1,"cik":"0001758350","reported_name":"O'Rourke Brendan M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Enterprise Risk Mgmt."}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2018-11-16T22:15:59.000Z","date":"2018-11-15","kind":"grant","acquired":true,"shares":2156,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Represents an award of restricted stock units (RSUs), each unit of which represents a contingent right to receive one share of Tetra Tech common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The restricted stock units (RSUs) become vested as to 25% of the shares underlying the RSUs on November 18, 2019, and on each anniversary of that date until the RSUs are fully vested."}],"balance_after":2156,"derivative":{"exercise_price":0,"exercise_date":"2019-11-18","expiration_date":"2022-11-18","underlying":"COMMON STOCK","underlying_shares":2156},"source":{"system":"sec-edgar","filing":"0000831641-18-000115","document":"wf-form4_154240654287598.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164118000115/wf-form4_154240654287598.xml","form_type":"4"}}]}