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(\"BMC\") common stock, par value $0.01 per share, and 24,253 restricted stock units of BMC in connection with the completion of the merger (the \"Merger\"), on January 1, 2021 (the \"Effective Date\"), of Boston Merger Sub I Inc., a subsidiary of the Issuer, with and into BMC, pursuant to the Agreement and Plan of Merger, dated as of August 26, 2020 (the \"Merger Agreement\"). 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At the Effective Time, each outstanding BMC restricted stock unit vested and settled into 1.3125 shares of BFS common stock in accordance with the Merger Agreement and each share of BMC common stock was converted into the right to receive 1.3125 shares of BFS common stock in accordance with the Merger Agreement."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Represents a disposition pursuant to the Merger Agreement. At the Effective Time, each outstanding BMC restricted stock unit vested and settled into 1.3125 shares of BFS common stock in accordance with the Merger Agreement and each share of BMC common stock was converted into the right to receive 1.3125 shares of BFS common stock in accordance with the Merger Agreement."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001574815-21-000019","document":"wf-form4_160988279164703.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1574815/000157481521000019/wf-form4_160988279164703.xml","form_type":"4"}},{"id":2918882,"issuer":{"id":144119,"kind":"organization","name":"BMC STOCK HOLDINGS, INC.","symbol":"BMCH"},"owners":[{"id":90594,"kind":"person","name":"FARMER MICHAEL ALAN","position":1,"cik":"0001612899","reported_name":"FARMER MICHAEL ALAN","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Common Stock","published_at":"2021-01-05T16:40:06.000Z","date":"2021-01-01","kind":"tax_withholding","acquired":false,"shares":10973,"price":53.68,"value":589030.64,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Reflects shares withheld to pay tax withholding requirements on vesting of restricted stock units at the Effective Time."}],"balance_after":25717,"source":{"system":"sec-edgar","filing":"0001574815-21-000019","document":"wf-form4_160988279164703.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1574815/000157481521000019/wf-form4_160988279164703.xml","form_type":"4"}},{"id":2918881,"issuer":{"id":144119,"kind":"organization","name":"BMC STOCK HOLDINGS, INC.","symbol":"BMCH"},"owners":[{"id":90594,"kind":"person","name":"FARMER MICHAEL ALAN","position":1,"cik":"0001612899","reported_name":"FARMER MICHAEL ALAN","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Common Stock","published_at":"2021-01-05T16:40:06.000Z","date":"2021-01-01","kind":"grant","acquired":true,"shares":16770,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents performance-vested restricted stock units earned in connection with the Agreement and Plan of Merger, dated as of August 26, 2020 (the \"Merger Agreement\"), by and among Builders FirstSource, Inc. 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Effective March 15, 2017 (the \"Grant Date\"), the reporting person was granted 3,134 restricted stock units of the Issuer, vesting over a three-year period in three substantially equivalent installments on each successive anniversary of the Grant Date, subject to the reporting person's continued employment with the Issuer."}],"balance_after":15379,"source":{"system":"sec-edgar","filing":"0001574815-20-000025","document":"wf-form4_158447722525843.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1574815/000157481520000025/wf-form4_158447722525843.xml","form_type":"4"}},{"id":3237302,"issuer":{"id":144119,"kind":"organization","name":"BMC STOCK HOLDINGS, INC.","symbol":"BMCH"},"owners":[{"id":90594,"kind":"person","name":"FARMER MICHAEL ALAN","position":1,"cik":"0001612899","reported_name":"FARMER MICHAEL ALAN","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Common Stock","published_at":"2020-03-02T17:19:09.000Z","date":"2020-03-01","kind":"tax_withholding","acquired":false,"shares":607,"price":24.53,"value":14889.71,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Reflects shares withheld to pay tax withholding requirements on vesting of previously granted restricted stock units. 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