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These shares were sold in multiple transactions at prices ranging from $30.84 to $31.78 per share, inclusive. 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The RSUs are subject to a liquidity-based vesting requirement, which was satisfied in connection with the Issuer's initial public offering, and a service-based vesting requirement.  Subject to the Reporting Person's continued employment, 25% of the RSUs vested on February 22, 2017 and 6.25% of the RSUs vest (or have vested, as applicable) on the last day of each three-month period thereafter until February 22, 2020.  Any vested RSUs will settle within 60 days of the date of vesting."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"On October 11, 2017, the Reporting Person was granted 176,000 RSUs convertible into shares of Class B common stock.  The RSUs are subject to a liquidity-based vesting requirement, which was satisfied in connection with the Issuer's initial public offering, and a service-based vesting requirement.  Subject to the Reporting Person's continued employment, 25% of the RSUs vested on February 22, 2017 and 6.25% of the RSUs vest (or have vested, as applicable) on the last day of each three-month period thereafter until February 22, 2020.  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These shares were sold in multiple transactions at prices ranging from 39.57 to 40.44 per share, inclusive. Information regarding the number of shares sold at each separate price will be made available from the Reporting Person upon request by the staff of the Securities and Exchange Commission, the Issuer or any security holder of the Issuer."}],"balance_after":163819,"source":{"system":"sec-edgar","filing":"0001127602-19-015465","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1718638/000112760219015465/form4.xml","form_type":"4"}},{"id":3565215,"issuer":{"id":4203,"kind":"organization","name":"CarGurus, Inc.","symbol":"CARG"},"owners":[{"id":134928,"kind":"person","name":"Welch Sarah Amory","position":1,"cik":"0001718638","reported_name":"Welch Sarah Amory","relationship":{"officer":true,"officer_title":"Chief Marketing Officer"}}],"security":"Class A Common Stock","published_at":"2019-04-03T16:44:42.000Z","date":"2019-04-01","kind":"tax_withholding","acquired":false,"shares":1400,"price":39.9,"value":55860.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares withheld for payment of tax liability upon vesting of restricted stock units."}],"balance_after":166319,"source":{"system":"sec-edgar","filing":"0001127602-19-014640","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1718638/000112760219014640/form4.xml","form_type":"4"}},{"id":3632463,"issuer":{"id":4203,"kind":"organization","name":"CarGurus, Inc.","symbol":"CARG"},"owners":[{"id":134928,"kind":"person","name":"Welch Sarah Amory","position":1,"cik":"0001718638","reported_name":"Welch Sarah Amory","relationship":{"officer":true,"officer_title":"Chief Marketing Officer"}}],"security":"Restricted Stock Units","published_at":"2019-02-26T17:37:07.000Z","date":"2019-02-22","kind":"exercise","acquired":false,"shares":11000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"Such RSUs convert into shares of Class B common stock on a one-for-one basis."},{"field":"shares","element":"transactionShares","label":"F2","text":"Each share of Class B common stock is convertible into one share of Class A common stock at the option of the holder and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"On October 11, 2017, the Reporting Person was granted 176,000 RSUs convertible into shares of Class B common stock.  The RSUs are subject to a liquidity-based vesting requirement, which was satisfied in connection with the Issuer's initial public offering, and a service-based vesting requirement.  Subject to the Reporting Person's continued employment, 25% of the RSUs vested on February 22, 2017 and 6.25% of the RSUs vest (or have vested, as applicable) on the last day of each three-month period thereafter until February 22, 2020.  Any vested RSUs will settle within 60 days of the date of vesting."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"On October 11, 2017, the Reporting Person was granted 176,000 RSUs convertible into shares of Class B common stock.  The RSUs are subject to a liquidity-based vesting requirement, which was satisfied in connection with the Issuer's initial public offering, and a service-based vesting requirement.  Subject to the Reporting Person's continued employment, 25% of the RSUs vested on February 22, 2017 and 6.25% of the RSUs vest (or have vested, as applicable) on the last day of each three-month period thereafter until February 22, 2020.  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Each RSU represents a contingent right to receive one share of?the?Issuer's Class A Common Stock. Subject to the?Reporting?Person's continuous service as an employee of the Issuer, 50% of the RSUs will vest on January 1, 2021 and the remaining 50% of the RSUs will vest on January 1, 2023. Such vesting may be accelerated in connection with a Change of Control (as defined in the Issuer's Omnibus Incentive Compensation Plan)."}],"balance_after":164144,"source":{"system":"sec-edgar","filing":"0001127602-19-004619","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1718638/000112760219004619/form4.xml","form_type":"4"}},{"id":3670490,"issuer":{"id":4203,"kind":"organization","name":"CarGurus, Inc.","symbol":"CARG"},"owners":[{"id":134928,"kind":"person","name":"Welch Sarah Amory","position":1,"cik":"0001718638","reported_name":"Welch Sarah Amory","relationship":{"officer":true,"officer_title":"Sr. VP, Consumer Marketing"}}],"security":"Class A Common Stock","published_at":"2019-02-07T17:23:03.000Z","date":"2019-02-06","kind":"grant","acquired":true,"shares":43725,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares issuable upon settlement of restricted stock units (\"RSUs\") granted to the Reporting Person. Each RSU represents a contingent right to receive one share of the Issuer's Class A Common Stock. Subject to the Reporting Person's continuous service as an employee of the Issuer, 6.25% of the RSUs will vest on April 1, 2019 and 6.25% of the RSUs will vest on the last day of each three-month period thereafter until January 1, 2023. Such vesting may be accelerated in connection with a Change of Control (as defined in the Issuer's Omnibus Incentive Compensation Plan)."}],"balance_after":117687,"source":{"system":"sec-edgar","filing":"0001127602-19-004619","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1718638/000112760219004619/form4.xml","form_type":"4"}},{"id":3697474,"issuer":{"id":4203,"kind":"organization","name":"CarGurus, Inc.","symbol":"CARG"},"owners":[{"id":134928,"kind":"person","name":"Welch Sarah Amory","position":1,"cik":"0001718638","reported_name":"Welch Sarah Amory","relationship":{"officer":true,"officer_title":"Sr. VP, Consumer Marketing"}}],"security":"Restricted Stock Units","published_at":"2019-01-11T16:14:11.000Z","date":"2018-11-21","kind":"exercise","acquired":false,"shares":11000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F4","text":"Such RSUs convert into shares of Class B common stock on a one-for-one basis."},{"field":"kind","element":"transactionCoding","label":"F2","text":"The original Form 4, filed on November 26, 2018, is being amended by this Form 4 amendment solely to correct an administrative error in which this transaction was inadvertently omitted."},{"field":"shares","element":"transactionShares","label":"F3","text":"Each share of Class B common stock is convertible into one share of Class A common stock at the option of the holder and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"On October 11, 2017, the Reporting Person was granted 176,000 RSUs convertible into shares of Class B common stock.  The RSUs are subject to a liquidity-based vesting requirement, which was satisfied in connection with the Issuer's initial public offering (the \"IPO\"), and a service-based vesting requirement.  Subject to the Reporting Person's continued employment, 25% of the RSUs vested on February 22, 2017 and 6.25% of the RSUs vest (or have vested, as applicable) on the last day of each three-month period thereafter until February 22, 2020.  Any vested RSUs will settle within 60 days of the date of vesting."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"On October 11, 2017, the Reporting Person was granted 176,000 RSUs convertible into shares of Class B common stock.  The RSUs are subject to a liquidity-based vesting requirement, which was satisfied in connection with the Issuer's initial public offering (the \"IPO\"), and a service-based vesting requirement.  Subject to the Reporting Person's continued employment, 25% of the RSUs vested on February 22, 2017 and 6.25% of the RSUs vest (or have vested, as applicable) on the last day of each three-month period thereafter until February 22, 2020.  Any vested RSUs will settle within 60 days of the date of vesting."}],"balance_after":55000,"derivative":{"underlying":"Class B Common Stock","underlying_shares":11000},"source":{"system":"sec-edgar","filing":"0001127602-19-001872","document":"form4a.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1718638/000112760219001872/form4a.xml","form_type":"4/A","original_submission_date":"2018-11-26"}},{"id":3697473,"issuer":{"id":4203,"kind":"organization","name":"CarGurus, Inc.","symbol":"CARG"},"owners":[{"id":134928,"kind":"person","name":"Welch Sarah Amory","position":1,"cik":"0001718638","reported_name":"Welch Sarah Amory","relationship":{"officer":true,"officer_title":"Sr. VP, Consumer Marketing"}}],"security":"Class A Common Stock","published_at":"2019-01-11T16:14:11.000Z","date":"2018-11-21","kind":"exercise","acquired":true,"shares":11000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The original Form 4, filed on November 26, 2018, is being amended by this Form 4 amendment solely to correct an administrative error in which this transaction was inadvertently omitted."},{"field":"shares","element":"transactionShares","label":"F3","text":"Each share of Class B common stock is convertible into one share of Class A common stock at the option of the holder and has no expiration date."}],"balance_after":74397,"source":{"system":"sec-edgar","filing":"0001127602-19-001872","document":"form4a.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1718638/000112760219001872/form4a.xml","form_type":"4/A","original_submission_date":"2018-11-26"}},{"id":3697472,"issuer":{"id":4203,"kind":"organization","name":"CarGurus, Inc.","symbol":"CARG"},"owners":[{"id":134928,"kind":"person","name":"Welch Sarah Amory","position":1,"cik":"0001718638","reported_name":"Welch Sarah Amory","relationship":{"officer":true,"officer_title":"Sr. VP, Consumer Marketing"}}],"security":"Class A Common Stock","published_at":"2019-01-11T16:14:11.000Z","date":"2018-11-21","kind":"tax_withholding","acquired":false,"shares":7335,"price":38.29,"value":280857.15,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares withheld for payment of tax liability upon vesting of restricted stock units (\"RSUs\")."}],"balance_after":63397,"source":{"system":"sec-edgar","filing":"0001127602-19-001872","document":"form4a.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1718638/000112760219001872/form4a.xml","form_type":"4/A","original_submission_date":"2018-11-26"}},{"id":3697471,"issuer":{"id":4203,"kind":"organization","name":"CarGurus, Inc.","symbol":"CARG"},"owners":[{"id":134928,"kind":"person","name":"Welch Sarah Amory","position":1,"cik":"0001718638","reported_name":"Welch Sarah Amory","relationship":{"officer":true,"officer_title":"Sr. VP, Consumer Marketing"}}],"security":"Restricted Stock Units","published_at":"2019-01-11T16:12:48.000Z","date":"2018-05-22","kind":"exercise","acquired":false,"shares":11000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F4","text":"Such RSUs convert into shares of Class B common stock on a one-for-one basis."},{"field":"kind","element":"transactionCoding","label":"F1","text":"The original Form 4, filed on May 23, 2018, is being amended by this Form 4 amendment solely to correct an administrative error in which this transaction was inadvertently omitted."},{"field":"shares","element":"transactionShares","label":"F2","text":"Each share of Class B common stock is convertible into one share of Class A common stock at the option of the holder and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"On October 11, 2017, the Reporting Person was granted 176,000 RSUs convertible into shares of Class B common stock.  The RSUs are subject to a liquidity-based vesting requirement, which was satisfied in connection with the Issuer's initial public offering (the \"IPO\"), and a service-based vesting requirement.  Subject to the Reporting Person's continued employment, 25% of the RSUs vested on February 22, 2017 and 6.25% of the RSUs vest (or have vested, as applicable) on the last day of each three-month period thereafter until February 22, 2020.  Any vested RSUs will settle within 60 days of the date of vesting."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"On October 11, 2017, the Reporting Person was granted 176,000 RSUs convertible into shares of Class B common stock.  The RSUs are subject to a liquidity-based vesting requirement, which was satisfied in connection with the Issuer's initial public offering (the \"IPO\"), and a service-based vesting requirement.  Subject to the Reporting Person's continued employment, 25% of the RSUs vested on February 22, 2017 and 6.25% of the RSUs vest (or have vested, as applicable) on the last day of each three-month period thereafter until February 22, 2020.  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These shares were sold in multiple transactions at prices ranging from $42.42 to $43.08 per share, inclusive. 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These shares were sold in multiple transactions at prices ranging from $41.41 to $42.34 per share, inclusive. Information regarding the number of shares sold at each separate price will be made available from the Reporting Person upon request by the staff of the Securities and Exchange Commission, the Issuer or any security holder of the Issuer."}],"balance_after":75132,"source":{"system":"sec-edgar","filing":"0001127602-18-030595","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1718638/000112760218030595/form4.xml","form_type":"4"}},{"id":3798930,"issuer":{"id":4203,"kind":"organization","name":"CarGurus, Inc.","symbol":"CARG"},"owners":[{"id":134928,"kind":"person","name":"Welch Sarah Amory","position":1,"cik":"0001718638","reported_name":"Welch Sarah Amory","relationship":{"officer":true,"officer_title":"Sr. VP, Consumer Marketing"}}],"security":"Class A Common Stock","published_at":"2018-10-03T17:52:42.000Z","date":"2018-10-01","kind":"tax_withholding","acquired":false,"shares":556,"price":54.7,"value":30413.2,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares withheld for payment of tax liability upon vesting of restricted stock units."}],"balance_after":78232,"source":{"system":"sec-edgar","filing":"0001127602-18-029457","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1718638/000112760218029457/form4.xml","form_type":"4"}},{"id":3834863,"issuer":{"id":4203,"kind":"organization","name":"CarGurus, Inc.","symbol":"CARG"},"owners":[{"id":134928,"kind":"person","name":"Welch Sarah Amory","position":1,"cik":"0001718638","reported_name":"Welch Sarah Amory","relationship":{"officer":true,"officer_title":"Sr. VP, Consumer Marketing"}}],"security":"Restricted Stock Units","published_at":"2018-08-23T17:41:55.000Z","date":"2018-08-22","kind":"exercise","acquired":false,"shares":11000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"Such RSUs convert into shares of Class B common stock on a one-for-one basis."},{"field":"shares","element":"transactionShares","label":"F4","text":"Each share of Class B common stock is convertible into one share of Class A common stock at the option of the holder and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"On October 11, 2017, the Reporting Person was granted 176,000 RSUs convertible into shares of Class B common stock.  The RSUs are subject to a liquidity-based vesting requirement, which was satisfied in connection with the Issuer's initial public offering (the \"IPO\"), and a service-based vesting requirement.  Subject to the Reporting Person's continued employment, 25% of the RSUs vested on February 22, 2017 and 6.25% of the RSUs vest (or have vested, as applicable) on the last day of each three-month period thereafter until February 22, 2020.  Any vested RSUs will settle within 60 days of the date of vesting."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"On October 11, 2017, the Reporting Person was granted 176,000 RSUs convertible into shares of Class B common stock.  The RSUs are subject to a liquidity-based vesting requirement, which was satisfied in connection with the Issuer's initial public offering (the \"IPO\"), and a service-based vesting requirement.  Subject to the Reporting Person's continued employment, 25% of the RSUs vested on February 22, 2017 and 6.25% of the RSUs vest (or have vested, as applicable) on the last day of each three-month period thereafter until February 22, 2020.  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These shares were sold in multiple transactions at prices ranging from $51.72 to $53.02 per share, inclusive. Information regarding the number of shares sold at each separate price will be made available from the Reporting Person upon request by the staff of the Securities and Exchange Commission, the Issuer or any security holder of the Issuer."}],"balance_after":75123,"source":{"system":"sec-edgar","filing":"0001127602-18-025304","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1718638/000112760218025304/form4.xml","form_type":"4"}},{"id":3865404,"issuer":{"id":4203,"kind":"organization","name":"CarGurus, Inc.","symbol":"CARG"},"owners":[{"id":134928,"kind":"person","name":"Welch Sarah Amory","position":1,"cik":"0001718638","reported_name":"Welch Sarah Amory","relationship":{"officer":true,"officer_title":"Sr. VP, Consumer Marketing"}}],"security":"Class A Common Stock","published_at":"2018-07-18T17:23:15.000Z","date":"2018-07-16","kind":"sale","acquired":false,"shares":7500,"price":37.07,"value":278025.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $36.46 to $37.47 per share, inclusive. Information regarding the number of shares sold at each separate price will be made available from the Reporting Person upon request by the staff of the Securities and Exchange Commission, the Issuer or any security holder of the Issuer."}],"balance_after":105123,"source":{"system":"sec-edgar","filing":"0001127602-18-023522","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1718638/000112760218023522/form4.xml","form_type":"4"}},{"id":3875646,"issuer":{"id":4203,"kind":"organization","name":"CarGurus, Inc.","symbol":"CARG"},"owners":[{"id":134928,"kind":"person","name":"Welch Sarah Amory","position":1,"cik":"0001718638","reported_name":"Welch Sarah Amory","relationship":{"officer":true,"officer_title":"Sr. VP, Consumer Marketing"}}],"security":"Class A Common Stock","published_at":"2018-07-03T17:03:44.000Z","date":"2018-06-29","kind":"tax_withholding","acquired":false,"shares":556,"price":34.74,"value":19315.44,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares withheld for payment of tax liability upon vesting of restricted stock units."}],"balance_after":112623,"source":{"system":"sec-edgar","filing":"0001127602-18-022680","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1718638/000112760218022680/form4.xml","form_type":"4"}},{"id":3920730,"issuer":{"id":4203,"kind":"organization","name":"CarGurus, Inc.","symbol":"CARG"},"owners":[{"id":134928,"kind":"person","name":"Welch Sarah Amory","position":1,"cik":"0001718638","reported_name":"Welch Sarah Amory","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. VP, Consumer Marketing"}}],"security":"Class A Common Stock","published_at":"2018-05-23T16:30:25.000Z","date":"2018-05-22","kind":"tax_withholding","acquired":false,"shares":7335,"price":31.08,"value":227971.8,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld for payment of tax liability upon vesting of restricted stock units."}],"balance_after":113179,"source":{"system":"sec-edgar","filing":"0000899243-18-013820","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1718638/000089924318013820/doc4.xml","form_type":"4"}},{"id":3963285,"issuer":{"id":4203,"kind":"organization","name":"CarGurus, Inc.","symbol":"CARG"},"owners":[{"id":134928,"kind":"person","name":"Welch Sarah Amory","position":1,"cik":"0001718638","reported_name":"Welch Sarah Amory","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. VP, Consumer Marketing"}}],"security":"Class A Common Stock","published_at":"2018-04-16T17:12:39.000Z","date":"2018-04-13","kind":"sale","acquired":false,"shares":20000,"price":32.94,"value":658800.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $32.53 to $33.75 per share, inclusive. Information regarding the number of shares sold at each separate price will be made available from the Reporting Person upon request by the staff of the Securities and Exchange Commission, the Issuer or any security holder of the Issuer."}],"balance_after":120514,"source":{"system":"sec-edgar","filing":"0000899243-18-010212","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1718638/000089924318010212/doc4.xml","form_type":"4"}},{"id":3964062,"issuer":{"id":4203,"kind":"organization","name":"CarGurus, Inc.","symbol":"CARG"},"owners":[{"id":134928,"kind":"person","name":"Welch Sarah Amory","position":1,"cik":"0001718638","reported_name":"Welch Sarah Amory","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. VP, Consumer Marketing"}}],"security":"Restricted Stock Units","published_at":"2018-04-13T18:28:22.000Z","date":"2018-04-11","kind":"exercise","acquired":false,"shares":44000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"Such RSUs convert into shares of Class A common stock on a one-for-one basis."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F8","text":"On October 11, 2017, the Reporting Person was granted 88,000 RSUs convertible into shares of Class A common stock.  The RSUs are subject to a liquidity-based vesting requirement, which was satisfied in connection with the IPO, and a service-based vesting requirement.  Subject to the Reporting Person's continued employment, 25% of the RSUs vested on February 22, 2017 and 6.25% of the RSUs vest (or have vested, as applicable) on the last day of each three-month period thereafter until February 22, 2020.  Currently vested RSUs settled 180 days after the date the liquidity-based vesting requirement was satisfied (April 11, 2018).  Thereafter, any vested RSUs will settle within 60 days of the date of vesting.  The Reporting Person has elected to report the remaining unvested 44,000 shares of Class A common stock underlying this RSU on Table I on subsequent reports (see footnote 2)."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F8","text":"On October 11, 2017, the Reporting Person was granted 88,000 RSUs convertible into shares of Class A common stock.  The RSUs are subject to a liquidity-based vesting requirement, which was satisfied in connection with the IPO, and a service-based vesting requirement.  Subject to the Reporting Person's continued employment, 25% of the RSUs vested on February 22, 2017 and 6.25% of the RSUs vest (or have vested, as applicable) on the last day of each three-month period thereafter until February 22, 2020.  Currently vested RSUs settled 180 days after the date the liquidity-based vesting requirement was satisfied (April 11, 2018).  Thereafter, any vested RSUs will settle within 60 days of the date of vesting.  The Reporting Person has elected to report the remaining unvested 44,000 shares of Class A common stock underlying this RSU on Table I on subsequent reports (see footnote 2)."}],"balance_after":0,"derivative":{"underlying":"Class A Common Stock","underlying_shares":44000},"source":{"system":"sec-edgar","filing":"0000899243-18-010143","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1718638/000089924318010143/doc4.xml","form_type":"4"}},{"id":3964061,"issuer":{"id":4203,"kind":"organization","name":"CarGurus, Inc.","symbol":"CARG"},"owners":[{"id":134928,"kind":"person","name":"Welch Sarah Amory","position":1,"cik":"0001718638","reported_name":"Welch Sarah Amory","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. VP, Consumer Marketing"}}],"security":"Class B Common Stock","published_at":"2018-04-13T18:28:22.000Z","date":"2018-04-11","kind":"exercise","acquired":false,"shares":88000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the conversion of Class B common stock into Class A common stock at the Reporting Person's election."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F7","text":"Each share of Class B common stock is convertible into one share of Class A common stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F7","text":"Each share of Class B common stock is convertible into one share of Class A common stock at the option of the holder and has no expiration date."}],"balance_after":0,"derivative":{"exercise_price":0,"underlying":"Class A Common Stock","underlying_shares":88000},"source":{"system":"sec-edgar","filing":"0000899243-18-010143","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1718638/000089924318010143/doc4.xml","form_type":"4"}},{"id":3964060,"issuer":{"id":4203,"kind":"organization","name":"CarGurus, Inc.","symbol":"CARG"},"owners":[{"id":134928,"kind":"person","name":"Welch Sarah Amory","position":1,"cik":"0001718638","reported_name":"Welch Sarah Amory","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. VP, Consumer Marketing"}}],"security":"Class B Common Stock","published_at":"2018-04-13T18:28:22.000Z","date":"2018-04-11","kind":"exercise","acquired":true,"shares":88000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F7","text":"Each share of Class B common stock is convertible into one share of Class A common stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F7","text":"Each share of Class B common stock is convertible into one share of Class A common stock at the option of the holder and has no expiration date."}],"balance_after":88000,"derivative":{"exercise_price":0,"underlying":"Class A Common Stock","underlying_shares":88000},"source":{"system":"sec-edgar","filing":"0000899243-18-010143","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1718638/000089924318010143/doc4.xml","form_type":"4"}},{"id":3964059,"issuer":{"id":4203,"kind":"organization","name":"CarGurus, Inc.","symbol":"CARG"},"owners":[{"id":134928,"kind":"person","name":"Welch Sarah Amory","position":1,"cik":"0001718638","reported_name":"Welch Sarah Amory","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. VP, Consumer Marketing"}}],"security":"Restricted Stock Units","published_at":"2018-04-13T18:28:22.000Z","date":"2018-04-11","kind":"exercise","acquired":false,"shares":88000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F5","text":"Such RSUs convert into shares of Class B common stock on a one-for-one basis."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"On October 11, 2017, the Reporting Person was granted 176,000 RSUs convertible into shares of Class B common stock.  The RSUs are subject to a liquidity-based vesting requirement, which was satisfied in connection with the Issuer's initial public offering (the \"IPO\"), and a service-based vesting requirement.  Subject to the Reporting Person's continued employment, 25% of the RSUs vested on February 22, 2017 and 6.25% of the RSUs vest (or have vested, as applicable) on the last day of each three-month period thereafter until February 22, 2020.  Currently vested RSUs settled 180 days after the date the liquidity-based vesting requirement was satisfied (April 11, 2018).  Thereafter, any vested RSUs will settle within 60 days of the date of vesting."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F6","text":"On October 11, 2017, the Reporting Person was granted 176,000 RSUs convertible into shares of Class B common stock.  The RSUs are subject to a liquidity-based vesting requirement, which was satisfied in connection with the Issuer's initial public offering (the \"IPO\"), and a service-based vesting requirement.  Subject to the Reporting Person's continued employment, 25% of the RSUs vested on February 22, 2017 and 6.25% of the RSUs vest (or have vested, as applicable) on the last day of each three-month period thereafter until February 22, 2020.  Currently vested RSUs settled 180 days after the date the liquidity-based vesting requirement was satisfied (April 11, 2018).  Thereafter, any vested RSUs will settle within 60 days of the date of vesting."}],"balance_after":88000,"derivative":{"underlying":"Class B Common Stock","underlying_shares":88000},"source":{"system":"sec-edgar","filing":"0000899243-18-010143","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1718638/000089924318010143/doc4.xml","form_type":"4"}},{"id":3964058,"issuer":{"id":4203,"kind":"organization","name":"CarGurus, Inc.","symbol":"CARG"},"owners":[{"id":134928,"kind":"person","name":"Welch Sarah Amory","position":1,"cik":"0001718638","reported_name":"Welch Sarah Amory","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. VP, Consumer Marketing"}}],"security":"Class A Common Stock","published_at":"2018-04-13T18:28:22.000Z","date":"2018-04-11","kind":"tax_withholding","acquired":false,"shares":55486,"price":38.06,"value":2111797.16,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Shares withheld for payment of tax liability upon vesting of RSUs."}],"balance_after":140514,"source":{"system":"sec-edgar","filing":"0000899243-18-010143","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1718638/000089924318010143/doc4.xml","form_type":"4"}},{"id":3964057,"issuer":{"id":4203,"kind":"organization","name":"CarGurus, Inc.","symbol":"CARG"},"owners":[{"id":134928,"kind":"person","name":"Welch Sarah Amory","position":1,"cik":"0001718638","reported_name":"Welch Sarah Amory","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. VP, Consumer Marketing"}}],"security":"Class A Common Stock","published_at":"2018-04-13T18:28:22.000Z","date":"2018-04-11","kind":"exercise","acquired":true,"shares":44000,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"The reported transaction represents the conversion of restricted stock units (\"RSUs\") into shares of Class A common stock.  The Reporting Person has previously reported the October 11, 2017 award of RSUs convertible into shares of Class A common stock in Table II of Form 4.  The total reported in Column 5 includes the 62,750 previously reported unvested RSUs convertible into shares of Class A common stock and 133,250 shares of Class A common stock."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Such RSUs convert into shares of Class A common stock on a one-for-one basis."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The reported transaction represents the conversion of restricted stock units (\"RSUs\") into shares of Class A common stock.  The Reporting Person has previously reported the October 11, 2017 award of RSUs convertible into shares of Class A common stock in Table II of Form 4.  The total reported in Column 5 includes the 62,750 previously reported unvested RSUs convertible into shares of Class A common stock and 133,250 shares of Class A common stock."}],"balance_after":196000,"source":{"system":"sec-edgar","filing":"0000899243-18-010143","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1718638/000089924318010143/doc4.xml","form_type":"4"}},{"id":3964056,"issuer":{"id":4203,"kind":"organization","name":"CarGurus, Inc.","symbol":"CARG"},"owners":[{"id":134928,"kind":"person","name":"Welch Sarah Amory","position":1,"cik":"0001718638","reported_name":"Welch Sarah Amory","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. VP, Consumer Marketing"}}],"security":"Class A Common Stock","published_at":"2018-04-13T18:28:22.000Z","date":"2018-04-11","kind":"exercise","acquired":true,"shares":88000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the conversion of Class B common stock into Class A common stock at the Reporting Person's election."}],"balance_after":108000,"source":{"system":"sec-edgar","filing":"0000899243-18-010143","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1718638/000089924318010143/doc4.xml","form_type":"4"}},{"id":4020360,"issuer":{"id":4203,"kind":"organization","name":"CarGurus, Inc.","symbol":"CARG"},"owners":[{"id":134928,"kind":"person","name":"Welch Sarah Amory","position":1,"cik":"0001718638","reported_name":"Welch Sarah Amory","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. VP, Consumer Marketing"}}],"security":"Class A Common Stock","published_at":"2018-03-02T18:20:49.000Z","date":"2018-02-28","kind":"grant","acquired":true,"shares":20000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares issuable upon settlement of restricted stock units (\"RSUs\") granted to the reporting person. Each RSU represents a contingent right to receive one share of Issuer's Class A Common Stock. Subject to the reporting person's continuous service as an employee of the Issuer, 6.25% of the RSUs will vest on April 1, 2018 and 6.25% of the RSUs will vest on the last day of each three-month period thereafter until January 1, 2022. Such vesting may be accelerated in connection with a Change of Control (as defined in the Issuer's Omnibus Incentive Compensation Plan)."}],"balance_after":20000,"source":{"system":"sec-edgar","filing":"0000899243-18-006212","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1718638/000089924318006212/doc4.xml","form_type":"4"}},{"id":4184065,"issuer":{"id":4203,"kind":"organization","name":"CarGurus, Inc.","symbol":"CARG"},"owners":[{"id":134928,"kind":"person","name":"Welch Sarah Amory","position":1,"cik":"0001718638","reported_name":"Welch Sarah Amory","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Consumer Marketing"}}],"security":"Restricted Stock Units","published_at":"2017-10-18T14:13:48.000Z","date":"2017-10-11","kind":"grant","acquired":true,"shares":176000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The RSUs granted to the reporting person are subject to a liquidity-based vesting requirement, which was satisfied upon effectiveness of the Registration Statement for the registration of its Class A Common Stock in its IPO, and a service-based vesting requirement. Each RSU represents a contingent right to receive one share of Issuer's Class B Common Stock. Subject to the reporting person's continued employment, 25% of the RSUs vested on February 22, 2017 and 6.25% of the RSUs have vested or will vest on the last day of each three month period thereafter until February 22, 2020. The RSUs are also subject to certain acceleration of vesting provisions in connection with the occurrence of a transaction (as defined in the 2015 Plan). Currently vested RSUs will settle 180 days after the date the liquidity-based vesting requirement was satisfied. Thereafter, any vested RSUs will settle within 60 days of the date of vesting."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs granted to the reporting person are subject to a liquidity-based vesting requirement, which was satisfied upon effectiveness of the Registration Statement for the registration of its Class A Common Stock in its IPO, and a service-based vesting requirement. Each RSU represents a contingent right to receive one share of Issuer's Class B Common Stock. Subject to the reporting person's continued employment, 25% of the RSUs vested on February 22, 2017 and 6.25% of the RSUs have vested or will vest on the last day of each three month period thereafter until February 22, 2020. The RSUs are also subject to certain acceleration of vesting provisions in connection with the occurrence of a transaction (as defined in the 2015 Plan). Currently vested RSUs will settle 180 days after the date the liquidity-based vesting requirement was satisfied. Thereafter, any vested RSUs will settle within 60 days of the date of vesting."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The RSUs granted to the reporting person are subject to a liquidity-based vesting requirement, which was satisfied upon effectiveness of the Registration Statement for the registration of its Class A Common Stock in its IPO, and a service-based vesting requirement. Each RSU represents a contingent right to receive one share of Issuer's Class B Common Stock. Subject to the reporting person's continued employment, 25% of the RSUs vested on February 22, 2017 and 6.25% of the RSUs have vested or will vest on the last day of each three month period thereafter until February 22, 2020. The RSUs are also subject to certain acceleration of vesting provisions in connection with the occurrence of a transaction (as defined in the 2015 Plan). Currently vested RSUs will settle 180 days after the date the liquidity-based vesting requirement was satisfied. Thereafter, any vested RSUs will settle within 60 days of the date of vesting."},{"field":"derivative.underlying","element":"underlyingSecurityTitle","label":"F4","text":"Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the reporting person or automatically either upon the transfer of such share of Class B Common Stock, except for certain events described in the Issuer's amended and restated certificate of incorporation (the \"Certificate\"), or upon the date falling after the first to occur of the death of Langley Steinert, Langley Steinert's voluntary termination of all employment with the Issuer and service on the Issuer's board of directors or the sum of the number of shares of the Issuer's capital stock held by Langley Steinert, by any Family Member of Langley Steinert, and by any Permitted Entity of Langley Steinert"},{"field":"derivative.underlying","element":"underlyingSecurityTitle","label":"F5","text":"(as such terms are defined in the Certificate), assuming the exercise and settlement in full of all outstanding options and convertible securities and calculated on an as-converted to Class A Common Stock basis, being less than 9,091,484 shares."}],"balance_after":176000,"derivative":{"underlying":"Class B Common Stock","underlying_shares":176000},"source":{"system":"sec-edgar","filing":"0001104659-17-062741","document":"a4a.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1718638/000110465917062741/a4a.xml","form_type":"4/A","original_submission_date":"2017-10-13"}},{"id":4184064,"issuer":{"id":4203,"kind":"organization","name":"CarGurus, Inc.","symbol":"CARG"},"owners":[{"id":134928,"kind":"person","name":"Welch Sarah Amory","position":1,"cik":"0001718638","reported_name":"Welch Sarah Amory","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Consumer Marketing"}}],"security":"Restricted Stock Units","published_at":"2017-10-18T14:13:48.000Z","date":"2017-10-11","kind":"grant","acquired":true,"shares":88000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"The restricted stock units (\"RSUs\") granted to the reporting person are subject to a liquidity-based vesting requirement, which was satisfied upon effectiveness of the Issuer's Registration Statement on Form S-1 (Form 333-220495) (the \"Registration Statement\") for the registration of its Class A Common Stock in its initial public offering (the \"IPO\"), and a service-based vesting requirement. Each RSU represents a contingent right to receive one share of Issuer's Class A Common Stock. Subject to the reporting person's continued employment, 25% of the RSUs vested on February 22, 2017 and 6.25% of the RSUs have vested or will vest on the last day of each three month period thereafter until February 22, 2020. The RSUs are also subject to certain acceleration of vesting provisions in connection with the occurrence of a transaction (as defined in the Issuer's Amended and Restated 2015 Equity Incentive Plan (the \"2015 Plan\"))."},{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Currently vested RSUs will settle 180 days after the date the liquidity-based vesting requirement was satisfied. Thereafter, any vested RSUs will settle within 60 days of the date of vesting."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The restricted stock units (\"RSUs\") granted to the reporting person are subject to a liquidity-based vesting requirement, which was satisfied upon effectiveness of the Issuer's Registration Statement on Form S-1 (Form 333-220495) (the \"Registration Statement\") for the registration of its Class A Common Stock in its initial public offering (the \"IPO\"), and a service-based vesting requirement. Each RSU represents a contingent right to receive one share of Issuer's Class A Common Stock. Subject to the reporting person's continued employment, 25% of the RSUs vested on February 22, 2017 and 6.25% of the RSUs have vested or will vest on the last day of each three month period thereafter until February 22, 2020. The RSUs are also subject to certain acceleration of vesting provisions in connection with the occurrence of a transaction (as defined in the Issuer's Amended and Restated 2015 Equity Incentive Plan (the \"2015 Plan\"))."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Currently vested RSUs will settle 180 days after the date the liquidity-based vesting requirement was satisfied. Thereafter, any vested RSUs will settle within 60 days of the date of vesting."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"The restricted stock units (\"RSUs\") granted to the reporting person are subject to a liquidity-based vesting requirement, which was satisfied upon effectiveness of the Issuer's Registration Statement on Form S-1 (Form 333-220495) (the \"Registration Statement\") for the registration of its Class A Common Stock in its initial public offering (the \"IPO\"), and a service-based vesting requirement. Each RSU represents a contingent right to receive one share of Issuer's Class A Common Stock. Subject to the reporting person's continued employment, 25% of the RSUs vested on February 22, 2017 and 6.25% of the RSUs have vested or will vest on the last day of each three month period thereafter until February 22, 2020. The RSUs are also subject to certain acceleration of vesting provisions in connection with the occurrence of a transaction (as defined in the Issuer's Amended and Restated 2015 Equity Incentive Plan (the \"2015 Plan\"))."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Currently vested RSUs will settle 180 days after the date the liquidity-based vesting requirement was satisfied. Thereafter, any vested RSUs will settle within 60 days of the date of vesting."}],"balance_after":88000,"derivative":{"underlying":"Class A Common Stock","underlying_shares":88000},"source":{"system":"sec-edgar","filing":"0001104659-17-062741","document":"a4a.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1718638/000110465917062741/a4a.xml","form_type":"4/A","original_submission_date":"2017-10-13"}},{"id":4186837,"issuer":{"id":4203,"kind":"organization","name":"CarGurus, Inc.","symbol":"CARG"},"owners":[{"id":134928,"kind":"person","name":"Welch Sarah Amory","position":1,"cik":"0001718638","reported_name":"Welch Sarah Amory","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Consumer Marketing"}}],"security":"Restricted Stock Units","published_at":"2017-10-13T19:36:58.000Z","date":"2017-10-11","kind":"grant","acquired":true,"shares":176000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The RSUs granted to the reporting person are subject to a liquidity-based vesting requirement, which was satisfied upon effectiveness of the Registration Statement for the registration of its Class A Common Stock in its IPO, and a service-based vesting requirement. Each RSU represents a contingent right to receive one share of Issuer's Class B Common Stock. Subject to the reporting person's continued employment, 25% of the RSUs vested on February 22, 2017 and 6.25% of the RSUs have vested or will vest on the last day of each three month period thereafter until February 22, 2020. The RSUs are also subject to certain acceleration of vesting provisions in connection with the occurrence of a transaction (as defined in the 2015 Plan). Currently vested RSUs will settle 180 days after the date the liquidity-based vesting requirement was satisfied. Thereafter, any vested RSUs will settle within 60 days of the date of vesting."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs granted to the reporting person are subject to a liquidity-based vesting requirement, which was satisfied upon effectiveness of the Registration Statement for the registration of its Class A Common Stock in its IPO, and a service-based vesting requirement. Each RSU represents a contingent right to receive one share of Issuer's Class B Common Stock. Subject to the reporting person's continued employment, 25% of the RSUs vested on February 22, 2017 and 6.25% of the RSUs have vested or will vest on the last day of each three month period thereafter until February 22, 2020. The RSUs are also subject to certain acceleration of vesting provisions in connection with the occurrence of a transaction (as defined in the 2015 Plan). Currently vested RSUs will settle 180 days after the date the liquidity-based vesting requirement was satisfied. Thereafter, any vested RSUs will settle within 60 days of the date of vesting."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The RSUs granted to the reporting person are subject to a liquidity-based vesting requirement, which was satisfied upon effectiveness of the Registration Statement for the registration of its Class A Common Stock in its IPO, and a service-based vesting requirement. Each RSU represents a contingent right to receive one share of Issuer's Class B Common Stock. Subject to the reporting person's continued employment, 25% of the RSUs vested on February 22, 2017 and 6.25% of the RSUs have vested or will vest on the last day of each three month period thereafter until February 22, 2020. The RSUs are also subject to certain acceleration of vesting provisions in connection with the occurrence of a transaction (as defined in the 2015 Plan). Currently vested RSUs will settle 180 days after the date the liquidity-based vesting requirement was satisfied. Thereafter, any vested RSUs will settle within 60 days of the date of vesting."},{"field":"derivative.underlying","element":"underlyingSecurityTitle","label":"F4","text":"Upon the closing of the IPO, each share of Class B Common Stock will be convertible into one share of Class A Common Stock at the option of the reporting person or automatically upon the transfer of such share of Class B Common Stock, except for certain events described in the Issuer's amended and restated certificate of incorporation then in effect (the \"Certificate\"), and upon the date falling after the first to occur of the death of the reporting person's voluntary termination of all employment with the Issuer and service on the Issuer's board of directors or the sum of the number of shares of the Issuer's capital stock held by Langley Steinert, by any Family Member of Langley Steinert, and by any Permitted Entity of Langley Steinert"},{"field":"derivative.underlying","element":"underlyingSecurityTitle","label":"F5","text":"(as such terms are defined in the Certificate), assuming the exercise and settlement in full of all outstanding options and convertible securities and calculated on an as-converted to Class A Common Stock basis, being less than 9,091,484."}],"balance_after":176000,"derivative":{"underlying":"Class B Common Stock","underlying_shares":176000},"source":{"system":"sec-edgar","filing":"0001104659-17-062194","document":"a4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1718638/000110465917062194/a4.xml","form_type":"4"}},{"id":4186836,"issuer":{"id":4203,"kind":"organization","name":"CarGurus, Inc.","symbol":"CARG"},"owners":[{"id":134928,"kind":"person","name":"Welch Sarah Amory","position":1,"cik":"0001718638","reported_name":"Welch Sarah Amory","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Consumer Marketing"}}],"security":"Restricted Stock Units","published_at":"2017-10-13T19:36:58.000Z","date":"2017-10-11","kind":"grant","acquired":true,"shares":88000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"The restricted stock units (\"RSUs\") granted to the reporting person are subject to a liquidity-based vesting requirement, which was satisfied upon effectiveness of the Issuer's Registration Statement on Form S-1 (Form 333-220495) (the \"Registration Statement\") for the registration of its Class A Common Stock in its initial public offering (the \"IPO\"), and a service-based vesting requirement. Each RSU represents a contingent right to receive one share of Issuer's Class A Common Stock. Subject to the reporting person's continued employment, 25% of the RSUs vested on February 22, 2017 and 6.25% of the RSUs have vested or will vest on the last day of each three month period thereafter until February 22, 2020. The RSUs are also subject to certain acceleration of vesting provisions in connection with the occurrence of a transaction (as defined in the Issuer's Amended and Restated 2015 Equity Incentive Plan (the \"2015 Plan\"))."},{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Currently vested RSUs will settle 180 days after the date the liquidity-based vesting requirement was satisfied. Thereafter, any vested RSUs will settle within 60 days of the date of vesting."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The restricted stock units (\"RSUs\") granted to the reporting person are subject to a liquidity-based vesting requirement, which was satisfied upon effectiveness of the Issuer's Registration Statement on Form S-1 (Form 333-220495) (the \"Registration Statement\") for the registration of its Class A Common Stock in its initial public offering (the \"IPO\"), and a service-based vesting requirement. Each RSU represents a contingent right to receive one share of Issuer's Class A Common Stock. Subject to the reporting person's continued employment, 25% of the RSUs vested on February 22, 2017 and 6.25% of the RSUs have vested or will vest on the last day of each three month period thereafter until February 22, 2020. The RSUs are also subject to certain acceleration of vesting provisions in connection with the occurrence of a transaction (as defined in the Issuer's Amended and Restated 2015 Equity Incentive Plan (the \"2015 Plan\"))."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Currently vested RSUs will settle 180 days after the date the liquidity-based vesting requirement was satisfied. Thereafter, any vested RSUs will settle within 60 days of the date of vesting."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"The restricted stock units (\"RSUs\") granted to the reporting person are subject to a liquidity-based vesting requirement, which was satisfied upon effectiveness of the Issuer's Registration Statement on Form S-1 (Form 333-220495) (the \"Registration Statement\") for the registration of its Class A Common Stock in its initial public offering (the \"IPO\"), and a service-based vesting requirement. Each RSU represents a contingent right to receive one share of Issuer's Class A Common Stock. Subject to the reporting person's continued employment, 25% of the RSUs vested on February 22, 2017 and 6.25% of the RSUs have vested or will vest on the last day of each three month period thereafter until February 22, 2020. The RSUs are also subject to certain acceleration of vesting provisions in connection with the occurrence of a transaction (as defined in the Issuer's Amended and Restated 2015 Equity Incentive Plan (the \"2015 Plan\"))."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Currently vested RSUs will settle 180 days after the date the liquidity-based vesting requirement was satisfied. Thereafter, any vested RSUs will settle within 60 days of the date of vesting."}],"balance_after":88000,"derivative":{"underlying":"Class A Common Stock","underlying_shares":88000},"source":{"system":"sec-edgar","filing":"0001104659-17-062194","document":"a4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1718638/000110465917062194/a4.xml","form_type":"4"}}]}