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The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a stockholder of the Issuer, information regarding the number of shares and prices at which the transaction was effected."}],"balance_after":131419,"source":{"system":"sec-edgar","filing":"0001628280-19-005841","document":"wf-form4_155692094161070.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1721003/000162828019005841/wf-form4_155692094161070.xml","form_type":"4"}},{"id":3539152,"issuer":{"id":3238,"kind":"organization","name":"Guardant Health, Inc.","symbol":"GH"},"owners":[{"id":138335,"kind":"person","name":"Lanman Richard B.","position":1,"cik":"0001721003","reported_name":"Lanman Richard B.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"COMMON STOCK","published_at":"2019-05-03T18:02:36.000Z","date":"2019-05-01","kind":"sale","acquired":false,"shares":2642,"price":64.49,"value":170382.58,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"These shares were sold under a pre-arranged sales plan pursuant to Rule 10b5-1 under the Securities Exchange Act of 1934, as amended. The shares sold were acquired contemporaneously upon the cashless exercise of one or more stock options at an exercise price of $4.18 or $8.80 per share."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $63.95 to $64.75, inclusive. 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The shares sold were acquired contemporaneously upon the cashless exercise of one or more stock options at an exercise price of $1.43, $4.18 or $8.80 per share."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price reported in Column 4 is a weighted average price. The transaction was executed in multiple trades ranging from $72.92 to $73.86.  The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a stockholder of the Issuer, information regarding the number of shares and prices at which the transaction was effected."}],"balance_after":130631,"source":{"system":"sec-edgar","filing":"0001628280-19-004409","document":"wf-form4_155554862858146.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/1721003/000162828019004409/wf-form4_155554862858146.xml","form_type":"4"}},{"id":3553223,"issuer":{"id":3238,"kind":"organization","name":"Guardant Health, Inc.","symbol":"GH"},"owners":[{"id":138335,"kind":"person","name":"Lanman Richard B.","position":1,"cik":"0001721003","reported_name":"Lanman Richard B.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"COMMON STOCK","published_at":"2019-04-17T20:50:44.000Z","date":"2019-04-17","kind":"sale","acquired":false,"shares":27396,"price":71.66,"value":1963197.36,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These shares were sold under a pre-arranged sales plan pursuant to Rule 10b5-1 under the Securities Exchange Act of 1934, as amended. The shares sold were acquired contemporaneously upon the cashless exercise of one or more stock options at an exercise price of $1.43, $4.18 or $8.80 per share."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price reported in Column 4 is a weighted average price. The transaction was executed in multiple trades ranging from $71.50 to $71.76.  The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a stockholder of the Issuer, information regarding the number of shares and prices at which the transaction was effected."}],"balance_after":149479,"source":{"system":"sec-edgar","filing":"0001628280-19-004409","document":"wf-form4_155554862858146.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1721003/000162828019004409/wf-form4_155554862858146.xml","form_type":"4"}},{"id":3553222,"issuer":{"id":3238,"kind":"organization","name":"Guardant Health, Inc.","symbol":"GH"},"owners":[{"id":138335,"kind":"person","name":"Lanman Richard B.","position":1,"cik":"0001721003","reported_name":"Lanman Richard B.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"COMMON STOCK","published_at":"2019-04-17T20:50:44.000Z","date":"2019-04-17","kind":"exercise","acquired":true,"shares":6916,"price":8.8,"value":60860.8,"ownership":{"direct":true},"balance_after":176875,"source":{"system":"sec-edgar","filing":"0001628280-19-004409","document":"wf-form4_155554862858146.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1721003/000162828019004409/wf-form4_155554862858146.xml","form_type":"4"}},{"id":3553221,"issuer":{"id":3238,"kind":"organization","name":"Guardant Health, Inc.","symbol":"GH"},"owners":[{"id":138335,"kind":"person","name":"Lanman Richard B.","position":1,"cik":"0001721003","reported_name":"Lanman Richard B.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"COMMON STOCK","published_at":"2019-04-17T20:50:44.000Z","date":"2019-04-17","kind":"exercise","acquired":true,"shares":17676,"price":4.18,"value":73885.68,"ownership":{"direct":true},"balance_after":169959,"source":{"system":"sec-edgar","filing":"0001628280-19-004409","document":"wf-form4_155554862858146.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1721003/000162828019004409/wf-form4_155554862858146.xml","form_type":"4"}},{"id":3553220,"issuer":{"id":3238,"kind":"organization","name":"Guardant Health, Inc.","symbol":"GH"},"owners":[{"id":138335,"kind":"person","name":"Lanman Richard B.","position":1,"cik":"0001721003","reported_name":"Lanman Richard B.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"COMMON STOCK","published_at":"2019-04-17T20:50:44.000Z","date":"2019-04-17","kind":"exercise","acquired":true,"shares":21652,"price":1.43,"value":30962.36,"ownership":{"direct":true},"balance_after":152283,"source":{"system":"sec-edgar","filing":"0001628280-19-004409","document":"wf-form4_155554862858146.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1721003/000162828019004409/wf-form4_155554862858146.xml","form_type":"4"}},{"id":3553219,"issuer":{"id":3238,"kind":"organization","name":"Guardant Health, Inc.","symbol":"GH"},"owners":[{"id":138335,"kind":"person","name":"Lanman Richard B.","position":1,"cik":"0001721003","reported_name":"Lanman Richard B.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"COMMON STOCK","published_at":"2019-04-17T20:50:44.000Z","date":"2019-04-16","kind":"sale","acquired":false,"shares":45000,"price":76.56,"value":3445200.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These shares were sold under a pre-arranged sales plan pursuant to Rule 10b5-1 under the Securities Exchange Act of 1934, as amended. The shares sold were acquired contemporaneously upon the cashless exercise of one or more stock options at an exercise price of $1.43, $4.18 or $8.80 per share."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. The transaction was executed in multiple trades ranging from $76.44 to $76.64.  The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a stockholder of the Issuer, information regarding the number of shares and prices at which the transaction was effected."}],"balance_after":130631,"source":{"system":"sec-edgar","filing":"0001628280-19-004409","document":"wf-form4_155554862858146.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1721003/000162828019004409/wf-form4_155554862858146.xml","form_type":"4"}},{"id":3553218,"issuer":{"id":3238,"kind":"organization","name":"Guardant Health, Inc.","symbol":"GH"},"owners":[{"id":138335,"kind":"person","name":"Lanman Richard B.","position":1,"cik":"0001721003","reported_name":"Lanman Richard B.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"COMMON STOCK","published_at":"2019-04-17T20:50:44.000Z","date":"2019-04-16","kind":"exercise","acquired":true,"shares":45000,"price":1.43,"value":64350.0,"ownership":{"direct":true},"balance_after":175631,"source":{"system":"sec-edgar","filing":"0001628280-19-004409","document":"wf-form4_155554862858146.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1721003/000162828019004409/wf-form4_155554862858146.xml","form_type":"4"}},{"id":3553217,"issuer":{"id":3238,"kind":"organization","name":"Guardant Health, Inc.","symbol":"GH"},"owners":[{"id":138335,"kind":"person","name":"Lanman Richard B.","position":1,"cik":"0001721003","reported_name":"Lanman Richard B.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"COMMON STOCK","published_at":"2019-04-17T20:50:44.000Z","date":"2019-04-15","kind":"sale","acquired":false,"shares":13500,"price":76.05,"value":1026675.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These shares were sold under a pre-arranged sales plan pursuant to Rule 10b5-1 under the Securities Exchange Act of 1934, as amended. The shares sold were acquired contemporaneously upon the cashless exercise of one or more stock options at an exercise price of $1.43, $4.18 or $8.80 per share."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. The transaction was executed in multiple trades ranging from $75.92 to $76.29.  The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a stockholder of the Issuer, information regarding the number of shares and prices at which the transaction was effected."}],"balance_after":130631,"source":{"system":"sec-edgar","filing":"0001628280-19-004409","document":"wf-form4_155554862858146.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1721003/000162828019004409/wf-form4_155554862858146.xml","form_type":"4"}},{"id":3553216,"issuer":{"id":3238,"kind":"organization","name":"Guardant Health, Inc.","symbol":"GH"},"owners":[{"id":138335,"kind":"person","name":"Lanman Richard B.","position":1,"cik":"0001721003","reported_name":"Lanman Richard B.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"COMMON STOCK","published_at":"2019-04-17T20:50:44.000Z","date":"2019-04-15","kind":"sale","acquired":false,"shares":31500,"price":73.98,"value":2330370.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These shares were sold under a pre-arranged sales plan pursuant to Rule 10b5-1 under the Securities Exchange Act of 1934, as amended. The shares sold were acquired contemporaneously upon the cashless exercise of one or more stock options at an exercise price of $1.43, $4.18 or $8.80 per share."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. The transaction was executed in multiple trades ranging from $73.86 to $74.19.  The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a stockholder of the Issuer, information regarding the number of shares and prices at which the transaction was effected."}],"balance_after":144131,"source":{"system":"sec-edgar","filing":"0001628280-19-004409","document":"wf-form4_155554862858146.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1721003/000162828019004409/wf-form4_155554862858146.xml","form_type":"4"}},{"id":3553215,"issuer":{"id":3238,"kind":"organization","name":"Guardant Health, Inc.","symbol":"GH"},"owners":[{"id":138335,"kind":"person","name":"Lanman Richard B.","position":1,"cik":"0001721003","reported_name":"Lanman Richard B.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"COMMON 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