<SEC-DOCUMENT>0001209191-21-001348.txt : 20210105
<SEC-HEADER>0001209191-21-001348.hdr.sgml : 20210105
<ACCEPTANCE-DATETIME>20210105173020
ACCESSION NUMBER:		0001209191-21-001348
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20210101
FILED AS OF DATE:		20210105
DATE AS OF CHANGE:		20210105

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Bullock David W
		CENTRAL INDEX KEY:			0001299799

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-51357
		FILM NUMBER:		21507350

	MAIL ADDRESS:	
		STREET 1:		C/O GRAHAM PACKAGING HOLDINGS COMPANY
		STREET 2:		2401 PLEASANT VALLEY ROAD
		CITY:			YORK
		STATE:			PA
		ZIP:			17402

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Builders FirstSource, Inc.
		CENTRAL INDEX KEY:			0001316835
		STANDARD INDUSTRIAL CLASSIFICATION:	RETAIL-LUMBER & OTHER BUILDING MATERIALS DEALERS [5211]
		IRS NUMBER:				522084569
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		2001 BRYAN STREET, SUITE 1600
		CITY:			DALLAS
		STATE:			TX
		ZIP:			75201
		BUSINESS PHONE:		(214) 880-3500

	MAIL ADDRESS:	
		STREET 1:		2001 BRYAN STREET, SUITE 1600
		CITY:			DALLAS
		STATE:			TX
		ZIP:			75201
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>doc3.xml
<DESCRIPTION>FORM 3 SUBMISSION
<TEXT>
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<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2021-01-01</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001316835</issuerCik>
        <issuerName>Builders FirstSource, Inc.</issuerName>
        <issuerTradingSymbol>BLDR</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001299799</rptOwnerCik>
            <rptOwnerName>Bullock David W</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O BUILDERS FIRSTSOURCE, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>2001 BRYAN ST., SUITE 1600</rptOwnerStreet2>
            <rptOwnerCity>DALLAS</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>75201</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <footnotes></footnotes>

    <remarks>On January 1, 2021, the merger (the &quot;Merger&quot;) of Boston Merger Sub I Inc., a subsidiary of the Issuer, with and into BMC Stock Holdings, Inc., pursuant to the Agreement and Plan of Merger, dated as of August 26, 2020, was completed. This report reflects the beneficial ownership of the Reporting Person at the time of completion of the Merger and does not include the securities of the Issuer acquired by the Reporting Person upon the completion of the Merger. The Reporting Person will file a Form 4 reflecting the Reporting Person's acquisition of securities of the Issuer in connection with the completion of the Merger.</remarks>

    <ownerSignature>
        <signatureName>/s/ Minator Azemi, by power of attorney</signatureName>
        <signatureDate>2021-01-05</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
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<TYPE>EX-24
<SEQUENCE>2
<FILENAME>attachment1.htm
<DESCRIPTION>EX-24 DOCUMENT
<TEXT>
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<PRE>
POWER OF ATTORNEY


      KNOW ALL PERSONS BY THESE PRESENTS that the undersigned hereby authorizes,
designates, and appoints Timothy D. Johnson, Jeffrey A. Wier, and Minator Azemi
as such person's true and lawful attorneys-in-fact and agents, with full power
of substitution and resubstitution and full power to act, for the undersigned
and in the undersigned's name, place, and stead, to execute, acknowledge,
deliver, and file any and all statements required to be filed with the United
States Securities and Exchange Commission (the "Commission") by the undersigned
pursuant to 1) Section 16 of the Securities Exchange Act of 1934, as amended
(the "1934 Act") or 2) Rule 144 promulgated under the Securities Act of 1933, as
amended (the "1933 Act"), and the rules and regulations thereunder with respect
to securities of Builders FirstSource, Inc., a Delaware corporation, including,
without limitation, statements on Form ID, Form 3, Form 4, Form 5 and Form 144
(and any amendments thereto) and any successor forms adopted by the Commission,
as required by the 1934 Act or the 1933 Act and the rules and regulations
thereunder, and to take such other actions as such attorneys-in-fact may deem
necessary or appropriate in connection with such statements.

      This power of attorney shall continue in effect until the undersigned no
longer has an obligation to file statements under Section 16 of the 1934 Act or
Rule 144 under the 1933 Act, or until specifically terminated in writing by the
undersigned.  The undersigned acknowledges that the aforesaid persons are not
assuming any of the undersigned's responsibilities to comply with Section 16 of
the 1934 Act or Rule 144 under the 1933 Act.

      IN WITNESS WHEREOF, the undersigned has duly executed this power of
attorney on the 1st day of January, 2021.




                                    By:	/s/ David W. Bullock
	David W. Bullock





</PRE>
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