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The reporting person hereby undertakes to provide full information regarding the number of shares and prices at which the transactions were effected upon request by the SEC staff, the issuer, or a security holder of the issuer."}],"balance_after":329479,"source":{"system":"sec-edgar","filing":"0001209191-17-019454","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1316835/000120919117019454/doc4.xml","form_type":"4"}},{"id":4394486,"issuer":{"id":3725,"kind":"organization","name":"Builders FirstSource, Inc.","symbol":"BLDR"},"owners":[{"id":19661,"kind":"person","name":"CROW M CHAD","position":1,"cik":"0001326953","reported_name":"CROW M CHAD","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and COO"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2017-03-09T00:36:39.000Z","date":"2017-03-06","kind":"sale","acquired":false,"shares":37500,"price":15.06,"value":564750.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"This transaction was executed in multiple trades at prices ranging from $15.00 to $15.15 per share.  The price reported above reflects the weighted average sale price.  The reporting person hereby undertakes to provide full information regarding the number of shares and prices at which the transactions were effected upon request by the SEC staff, the issuer, or a security holder of the issuer."}],"balance_after":385708,"source":{"system":"sec-edgar","filing":"0001209191-17-019454","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1316835/000120919117019454/doc4.xml","form_type":"4"}},{"id":4394485,"issuer":{"id":3725,"kind":"organization","name":"Builders FirstSource, Inc.","symbol":"BLDR"},"owners":[{"id":19661,"kind":"person","name":"CROW M CHAD","position":1,"cik":"0001326953","reported_name":"CROW M CHAD","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and COO"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2017-03-09T00:36:39.000Z","date":"2017-03-06","kind":"exercise","acquired":true,"shares":37500,"price":6.35,"value":238125.0,"ownership":{"direct":true},"balance_after":423208,"source":{"system":"sec-edgar","filing":"0001209191-17-019454","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1316835/000120919117019454/doc4.xml","form_type":"4"}},{"id":4394484,"issuer":{"id":3725,"kind":"organization","name":"Builders FirstSource, Inc.","symbol":"BLDR"},"owners":[{"id":19661,"kind":"person","name":"CROW M CHAD","position":1,"cik":"0001326953","reported_name":"CROW M CHAD","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and COO"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2017-03-09T00:36:39.000Z","date":"2017-03-06","kind":"sale","acquired":false,"shares":12750,"price":15.06,"value":192015.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"This transaction was executed in multiple trades at prices ranging from $15.00 to $15.15 per share.  The price reported above reflects the weighted average sale price.  The reporting person hereby undertakes to provide full information regarding the number of shares and prices at which the transactions were effected upon request by the SEC staff, the issuer, or a security holder of the issuer."}],"balance_after":385708,"source":{"system":"sec-edgar","filing":"0001209191-17-019454","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1316835/000120919117019454/doc4.xml","form_type":"4"}},{"id":4394483,"issuer":{"id":3725,"kind":"organization","name":"Builders FirstSource, Inc.","symbol":"BLDR"},"owners":[{"id":19661,"kind":"person","name":"CROW M CHAD","position":1,"cik":"0001326953","reported_name":"CROW M CHAD","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and COO"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2017-03-09T00:36:39.000Z","date":"2017-03-06","kind":"exercise","acquired":true,"shares":12750,"price":3.19,"value":40672.5,"ownership":{"direct":true},"balance_after":398458,"source":{"system":"sec-edgar","filing":"0001209191-17-019454","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1316835/000120919117019454/doc4.xml","form_type":"4"}},{"id":4402914,"issuer":{"id":3725,"kind":"organization","name":"Builders FirstSource, Inc.","symbol":"BLDR"},"owners":[{"id":19661,"kind":"person","name":"CROW M CHAD","position":1,"cik":"0001326953","reported_name":"CROW M CHAD","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and COO"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2017-03-04T00:41:22.000Z","date":"2017-03-01","kind":"grant","acquired":true,"shares":43742,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Reflects the acquisition of restricted stock units pursuant to the Corporation's 2014 Incentive Plan. 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