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The restricted stock units vest in 33.33% increments on each of March 15, 2022-2024 and entitle the reporting person to one share of common stock for each restricted stock unit that vests."}],"balance_after":23877,"source":{"system":"sec-edgar","filing":"0001209191-21-021402","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1316835/000120919121021402/doc4.xml","form_type":"4"}},{"id":2805522,"issuer":{"id":3725,"kind":"organization","name":"Builders FirstSource, Inc.","symbol":"BLDR"},"owners":[{"id":40418,"kind":"person","name":"Hiller Michael","position":1,"cik":"0001837949","reported_name":"Hiller Michael","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President - Central Division"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2021-03-05T21:05:21.000Z","date":"2021-03-04","kind":"sale","acquired":false,"shares":8330,"price":41.96,"value":349526.8,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"This transaction was executed in multiple trades at prices ranging from $41.96 to $41.97 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":16965,"source":{"system":"sec-edgar","filing":"0001209191-21-018174","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1316835/000120919121018174/doc4.xml","form_type":"4"}},{"id":2919545,"issuer":{"id":3725,"kind":"organization","name":"Builders FirstSource, Inc.","symbol":"BLDR"},"owners":[{"id":40418,"kind":"person","name":"Hiller Michael","position":1,"cik":"0001837949","reported_name":"Hiller Michael","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President - Central Division"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2021-01-05T22:45:21.000Z","date":"2021-01-01","kind":"grant","acquired":true,"shares":25295,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Received in exchange for 6,763 shares of BMC Stock Holdings, Inc. 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