SEC Form 4

FORM 4		UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
X	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* JLL Building Holdings, LLC (Last) (First) (Middle) C/O JLL PARTNERS LLC 450 LEXINGTON AVENUE, 31ST FLOOR (Street) NEW YORK NY 10017 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol Builders FirstSource, Inc. [ BLDR ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director X 10% Owner Officer (give title below) Other (specify below)
	3. Date of Earliest Transaction (Month/Day/Year) 09/06/2017
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) Form filed by One Reporting Person X Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock, par value $0.01 per share	09/06/2017		S		13,482,177	D	$16.17	862,407	I	See footnote(1)(2)
Common Stock, par value $0.01 per share	09/06/2017		J(3)		862,407	D	(3)	0	I	See footnote(1)(2)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

1. Name and Address of Reporting Person* JLL Building Holdings, LLC (Last) (First) (Middle) C/O JLL PARTNERS LLC 450 LEXINGTON AVENUE, 31ST FLOOR (Street) NEW YORK NY 10017 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* JLL PARTNERS FUND V LP (Last) (First) (Middle) 450 LEXINGTON AVE, 31ST FLOOR (Street) NEW YORK NY 10017 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* JLL Associates V, L.P. (Last) (First) (Middle) 450 LEXINGTON AVE, SUITE 3350 (Street) NEW YORK NY 10017 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* JLL Associates G.P. V, L.L.C. (Last) (First) (Middle) 450 LEXINGTON AVE, SUITE 3350 (Street) NEW YORK NY 10017 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

Explanation of Responses:

1. This report is filed jointly by JLL Building Holdings, LLC ("JLL Holdings"); JLL Partners Fund V, L.P., the sole member of JLL Holdings ("JLL Fund V"); JLL Associates V, L.P., the general partner of JLL Fund V (the "General Partner"); and JLL Associates G.P. V, L.L.C., the general partner of the General Partner (collectively, the "Reporting Persons"). JLL Holdings was previously the direct owner of 14,344,584 shares of common stock, par value $0.01 per share ("Shares"), of Builders FirstSource, Inc. (the "Company"). By reason of the provisions of Rule 16a-1 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), JLL Fund V, the General Partner and JLL Associates G.P. V, L.L.C. may be deemed to be the beneficial owners of any securities that may be beneficially owned by JLL Holdings. (continued in footnote 2)

2. However, the foregoing Reporting Persons disclaim beneficial ownership of these securities, except to the extent of any pecuniary interest therein, and this report shall not be deemed an admission that any such Reporting Person is the beneficial owner of the securities for purposes of Section 16 of the Exchange Act or for any other purpose.

3. On September 6, 2017, JLL Holdings agreed to effect a pro rata distribution of 862,407 Shares to its sole member, JLL Fund V, for no consideration and in lieu of participation in the sale of Shares reported above. Immediately following receipt of such distribution, JLL Fund V intends to effect a pro rata distribution of such Shares to its general partner and certain of its limited partners, for no consideration. None of the recipients of Shares in such pro rata distributions were direct or indirect participants in the sale of Shares reported above.

Remarks:

	JLL Building Holdings, LLC, JLL Partners Fund V, L.P., JLL Associates V, L.P., JLL Associates G.P. V, L.L.C. /s/ Daniel Agroskin, Authorized Signatory of JLL Associates G.P. V, L.L.C.	09/08/2017
	JLL Partners Fund V, L.P., JLL Associates V, L.P., JLL Associates G.P. V, L.L.C. /s/ Daniel Agroskin, Authorized Signatory of JLL Associates G.P. V, L.L.C.	09/08/2017
	JLL Associates V, L.P., JLL Associates G.P. V, L.L.C. /s/ Daniel Agroskin, Authorized Signatory of JLL Associates G.P. V, L.L.C.	09/08/2017
	JLL Associates G.P. V, L.L.C. /s/ Daniel Agroskin, Authorized Signatory of JLL Associates G.P. V, L.L.C.	09/08/2017
	** Signature of Reporting Person	Date
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