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The reporting person hereby undertakes to provide to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transaction was effected."}],"balance_after":23805,"source":{"system":"sec-edgar","filing":"0001214659-26-006649","document":"marketforms-73238.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1035201/000121465926006649/marketforms-73238.xml","form_type":"4"}},{"id":859210,"issuer":{"id":4212,"kind":"organization","name":"CALIFORNIA WATER SERVICE GROUP","symbol":"CWT"},"owners":[{"id":23475,"kind":"person","name":"Krummel Thomas M","position":1,"cik":"0001495768","reported_name":"Krummel Thomas M","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-03-05T23:58:49.000Z","date":"2026-03-03","kind":"grant","planned":false,"acquired":true,"shares":2816,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Restricted stock granted on 3/3/2026 pursuant to the California Water Service Group equity incentive plan in a transaction exempt under Rule 16-b-3 vests with a one-year cliff vesting term, vesting 100% on the first anniversary of the grant date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes shares acquired through Dividend Reinvestment."}],"balance_after":27504.8,"source":{"system":"sec-edgar","filing":"0001495768-26-000002","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1035201/000149576826000002/edgardoc.xml","form_type":"4"}},{"id":1220220,"issuer":{"id":4212,"kind":"organization","name":"CALIFORNIA WATER SERVICE GROUP","symbol":"CWT"},"owners":[{"id":23475,"kind":"person","name":"Krummel Thomas M","position":1,"cik":"0001495768","reported_name":"Krummel Thomas M","relationship":{"director":true}}],"security":"Common Stock","published_at":"2025-03-06T23:36:15.000Z","date":"2025-03-04","kind":"grant","planned":false,"acquired":true,"shares":2645,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Restricted stock granted on 3/4/2025 pursuant to the California Water Service Group equity incentive plan in a transaction exempt under Rule 16-b-3.  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This transaction was executed in multiple trades at prices ranging from $54.29 to $54.41. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."}],"balance_after":22505.8,"source":{"system":"sec-edgar","filing":"0001127602-24-022761","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1035201/000112760224022761/form4.xml","form_type":"4"}},{"id":1438030,"issuer":{"id":4212,"kind":"organization","name":"CALIFORNIA WATER SERVICE GROUP","symbol":"CWT"},"owners":[{"id":23475,"kind":"person","name":"Krummel Thomas M","position":1,"cik":"0001495768","reported_name":"Krummel Thomas M","relationship":{"director":true}}],"security":"Common Stock","published_at":"2024-08-08T16:29:43.000Z","date":"2024-08-07","kind":"sale","planned":true,"acquired":false,"shares":555,"price":52.9082,"value":29364.051,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The price reported represents the weighted average sale price per share.  The shares were sold in multiple transactions at prices from $52.83 to $53.0050.  Upon request by the staff of the U.S. Securities and Exchange Commission, the issuer, or a security holder of the issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price."}],"balance_after":23060.8,"source":{"system":"sec-edgar","filing":"0001127602-24-021846","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1035201/000112760224021846/form4.xml","form_type":"4"}},{"id":1452932,"issuer":{"id":4212,"kind":"organization","name":"CALIFORNIA WATER SERVICE GROUP","symbol":"CWT"},"owners":[{"id":23475,"kind":"person","name":"Krummel Thomas M","position":1,"cik":"0001495768","reported_name":"Krummel Thomas M","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2024-07-17T21:46:36.000Z","date":"2024-07-17","kind":"sale","planned":true,"acquired":false,"shares":555,"price":52.9886,"value":29408.673,"ownership":{"direct":true},"balance_after":23616,"source":{"system":"sec-edgar","filing":"0001214659-24-012587","document":"marketforms-66580.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1035201/000121465924012587/marketforms-66580.xml","form_type":"4"}},{"id":1456398,"issuer":{"id":4212,"kind":"organization","name":"CALIFORNIA WATER SERVICE GROUP","symbol":"CWT"},"owners":[{"id":23475,"kind":"person","name":"Krummel Thomas M","position":1,"cik":"0001495768","reported_name":"Krummel Thomas M","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2024-07-11T22:28:12.000Z","date":"2024-07-11","kind":"sale","planned":true,"acquired":false,"shares":1654,"price":50.07,"value":82815.78,"ownership":{"direct":true},"balance_after":24171,"source":{"system":"sec-edgar","filing":"0001214659-24-012281","document":"marketforms-66548.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1035201/000121465924012281/marketforms-66548.xml","form_type":"4"}},{"id":1488737,"issuer":{"id":4212,"kind":"organization","name":"CALIFORNIA WATER SERVICE GROUP","symbol":"CWT"},"owners":[{"id":23475,"kind":"person","name":"Krummel Thomas M","position":1,"cik":"0001495768","reported_name":"Krummel Thomas M","relationship":{"director":true}}],"security":"Common Stock","published_at":"2024-06-07T01:21:03.000Z","date":"2024-06-05","kind":"grant","planned":false,"acquired":true,"shares":2488,"price":49.62,"value":123454.56,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Restricted stock granted 6/5/2024 pursuant to the California Water Service Group equity incentive plan exempt under Rule 16-b-3.  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These shares were sold in multiple transactions at prices ranging from $48.82 to $49.23, inclusive. 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Upon requste by the staff of the U.S. Securities and Exchange Commission, the issuer, or a security holder of the issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price."}],"balance_after":26066,"source":{"system":"sec-edgar","filing":"0001127602-24-000828","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1035201/000112760224000828/form4.xml","form_type":"4"}},{"id":1703531,"issuer":{"id":4212,"kind":"organization","name":"CALIFORNIA WATER SERVICE GROUP","symbol":"CWT"},"owners":[{"id":23475,"kind":"person","name":"Krummel Thomas M","position":1,"cik":"0001495768","reported_name":"Krummel Thomas M","relationship":{"director":true}}],"security":"Common Stock","published_at":"2023-12-20T22:42:35.000Z","date":"2023-12-20","kind":"sale","planned":true,"acquired":false,"shares":555,"price":53.45,"value":29664.75,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"1. 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The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."}],"balance_after":26621,"source":{"system":"sec-edgar","filing":"0001127602-23-030203","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1035201/000112760223030203/form4.xml","form_type":"4"}},{"id":1719297,"issuer":{"id":4212,"kind":"organization","name":"CALIFORNIA WATER SERVICE GROUP","symbol":"CWT"},"owners":[{"id":23475,"kind":"person","name":"Krummel Thomas M","position":1,"cik":"0001495768","reported_name":"Krummel Thomas M","relationship":{"director":true}}],"security":"Common Stock","published_at":"2023-12-07T20:50:10.000Z","date":"2023-12-06","kind":"disposition_to_issuer","planned":true,"acquired":false,"shares":555,"price":53.06,"value":29448.3,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The price reported represents the weighted average sale price per share.  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Upon requste by the staff of the U.S. Securities and Exchange Commission, the issuer, or a security holder of the issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"Thomas M Krummel, M.D., appointed to California Water Service Group Board of Directors effective July 1, 2010."}],"balance_after":27176,"source":{"system":"sec-edgar","filing":"0001127602-23-029043","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1035201/000112760223029043/form4.xml","form_type":"4"}},{"id":1741090,"issuer":{"id":4212,"kind":"organization","name":"CALIFORNIA WATER SERVICE GROUP","symbol":"CWT"},"owners":[{"id":23475,"kind":"person","name":"Krummel Thomas M","position":1,"cik":"0001495768","reported_name":"Krummel Thomas M","relationship":{"director":true}}],"security":"Common Stock","published_at":"2023-11-15T22:35:46.000Z","date":"2023-11-15","kind":"sale","planned":true,"acquired":false,"shares":555,"price":51.7669,"value":28730.6295,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported represents the weighted average sale price per share.  The shares were sold in multiple transactions at prices from $51.75 to $51.82.  Upon request by the staff of the U.S. Securities and Exchange Commission, the issuer, or a security holder of the issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price."}],"balance_after":27731,"source":{"system":"sec-edgar","filing":"0001127602-23-027449","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1035201/000112760223027449/form4.xml","form_type":"4"}},{"id":1750173,"issuer":{"id":4212,"kind":"organization","name":"CALIFORNIA WATER SERVICE GROUP","symbol":"CWT"},"owners":[{"id":23475,"kind":"person","name":"Krummel Thomas M","position":1,"cik":"0001495768","reported_name":"Krummel Thomas M","relationship":{"director":true}}],"security":"Common Stock","published_at":"2023-11-04T00:04:18.000Z","date":"2023-11-02","kind":"sale","planned":true,"acquired":false,"shares":2220,"price":50,"value":111000.0,"ownership":{"direct":true},"balance_after":28286,"source":{"system":"sec-edgar","filing":"0001127602-23-026807","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1035201/000112760223026807/form4.xml","form_type":"4"}},{"id":1852158,"issuer":{"id":4831,"kind":"organization","name":"PROCEPT BioRobotics Corp","symbol":"PRCT"},"owners":[{"id":23475,"kind":"person","name":"Krummel Thomas M","position":1,"cik":"0001495768","reported_name":"Krummel Thomas M","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (Right to Buy)","published_at":"2023-06-16T20:50:01.000Z","date":"2023-06-15","kind":"grant","planned":false,"acquired":true,"shares":4865,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Stock Option was granted on June 15, 2023 and vests in full on the earlier to occur of (i) the one-year anniversary of the grant date, or (ii) the date of the next annual meeting following the grant date, subject to continued service through the applicable vesting date."}],"balance_after":4865,"derivative":{"exercise_price":35.09,"expiration_date":"2033-06-14","underlying":"Common Stock","underlying_shares":4865},"source":{"system":"sec-edgar","filing":"0001628280-23-022498","document":"wk-form4_1686948588.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1495768/000162828023022498/wk-form4_1686948588.xml","form_type":"4"}},{"id":1852157,"issuer":{"id":4831,"kind":"organization","name":"PROCEPT BioRobotics Corp","symbol":"PRCT"},"owners":[{"id":23475,"kind":"person","name":"Krummel Thomas M","position":1,"cik":"0001495768","reported_name":"Krummel Thomas M","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2023-06-16T20:50:01.000Z","date":"2023-06-15","kind":"grant","planned":false,"acquired":true,"shares":2711,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These securities are restricted stock units (RSUs). 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This transaction was executed in a single transaction at a price of $64.89 per share. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."}],"balance_after":28636,"source":{"system":"sec-edgar","filing":"0001214659-22-015113","document":"marketforms-57898.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1035201/000121465922015113/marketforms-57898.xml","form_type":"4"}},{"id":2101721,"issuer":{"id":4212,"kind":"organization","name":"CALIFORNIA WATER SERVICE GROUP","symbol":"CWT"},"owners":[{"id":23475,"kind":"person","name":"Krummel Thomas M","position":1,"cik":"0001495768","reported_name":"Krummel Thomas M","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2022-11-30T23:31:31.000Z","date":"2022-11-30","kind":"sale","acquired":false,"shares":1529,"price":62.92,"value":96204.68,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"1. This transaction was executed in multiple trades at prices ranging from $62.84 to $62.985 The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."}],"balance_after":29105,"source":{"system":"sec-edgar","filing":"0001214659-22-014340","document":"marketforms-57726.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1035201/000121465922014340/marketforms-57726.xml","form_type":"4"}},{"id":2224090,"issuer":{"id":4831,"kind":"organization","name":"PROCEPT BioRobotics Corp","symbol":"PRCT"},"owners":[{"id":23475,"kind":"person","name":"Krummel Thomas M","position":1,"cik":"0001495768","reported_name":"Krummel Thomas M","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (Right to 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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 footnotes (2) through (4) to this Form 4."}],"balance_after":92443,"source":{"system":"sec-edgar","filing":"0001628280-22-017818","document":"wf-form4_165593947799902.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1495768/000162828022017818/wf-form4_165593947799902.xml","form_type":"4"}},{"id":2224084,"issuer":{"id":4831,"kind":"organization","name":"PROCEPT BioRobotics Corp","symbol":"PRCT"},"owners":[{"id":23475,"kind":"person","name":"Krummel Thomas M","position":1,"cik":"0001495768","reported_name":"Krummel Thomas M","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common 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