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* Warburg Pincus Private Equity IX, L.P. (Last) (First) (Middle) C/O WARBURG PINCUS LLC 450 LEXINGTON AVENUE (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) 05/24/2016
	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	05/24/2016		S		13,263,266	D	$10.4	0	D(1)(2)(3)

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* Warburg Pincus Private Equity IX, L.P. (Last) (First) (Middle) C/O WARBURG PINCUS LLC 450 LEXINGTON AVENUE (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* Warburg Pincus IX GP L.P. (Last) (First) (Middle) C/O WARBURG PINCUS LLC 450 LEXINGTON AVENUE (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* WPP GP LLC (Last) (First) (Middle) C/O WARBURG PINCUS LLC 450 LEXINGTON AVENUE (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* Warburg Pincus Partners, L.P. (Last) (First) (Middle) C/O WARBURG PINCUS LLC 450 LEXINGTON AVENUE (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* Warburg Pincus Partners GP LLC (Last) (First) (Middle) C/O WARBURG PINCUS LLC 450 LEXINGTON AVENUE (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* WARBURG PINCUS & CO. (Last) (First) (Middle) 450 LEXINGTON AVENUE (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* WARBURG PINCUS LLC (Last) (First) (Middle) 450 LEXINGTON AVENUE (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* KAYE CHARLES R (Last) (First) (Middle) C/O WARBURG PINCUS LLC 450 LEXINGTON AVENUE (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* Landy Joseph P. (Last) (First) (Middle) C/O WARBURG PINCUS LLC 450 LEXINGTON AVENUE (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 Form 4 is filed on behalf of (i) Warburg Pincus Private Equity IX, L.P., a Delaware limited partnership ("WP IX"); (ii) Warburg Pincus IX GP L.P., a Delaware limited partnership ("WP IX GP"), the general partner of WP IX; (iii) WPP GP LLC, a Delaware limited liability company ("WPP GP"), the general partner of WP IX GP; (iv) Warburg Pincus Partners, L.P., a Delaware limited partnership ("WP Partners"), the managing member of WPP GP; (v) Warburg Pincus Partners GP LLC, a Delaware limited liability company ("WP Partners GP"), the general partner of WP Partners; (vi) Warburg Pincus & Co., a New York general partnership ("WP"), the managing member of WP Partners GP; (vii) Warburg Pincus LLC, a New York limited liability company ("WP LLC"), which manages WP IX; and (viii) Charles R. Kaye and Joseph P. Landy who are Managing General Partners of WP and Managing Members and Co-Chief Executive Officers of WP LLC and may be deemed to control the entities listed in clauses (i) through (vii).

2. All shares of common stock, par value $0.01 per share (the "Common Stock"), of the Company that are reported herein are held by WP IX. By reason of the provisions of Rule 16a-1 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), WP IX GP, WPP GP, WP Partners, WP Partners GP, WP, WP LLC, Mr. Kaye and Mr. Landy may be deemed to be the beneficial owners of any securities that may be beneficially owned by WP IX. Each of WP IX GP, WPP GP, WP Partners, WP Partners GP, WP, WP LLC, Mr. Kaye and Mr. Landy disclaim beneficial ownership of all shares of Common Stock that may be deemed to be beneficially owned by WP IX, except to the extent of any indirect pecuniary interest therein. (Continued in Footnote 3)

3. (Continued from Footnote 2) This Form 4 shall not be deemed an admission that any reporting person, other than WP IX, or any other person referred to herein is a beneficial owner or any shares of Common Stock for purposes of Section 16 of the Exchange Act or for any other purpose or that any reporting person, other than WP IX, or other person has an obligation to file this Form 4.

Remarks:

* The Power of Attorney given by each of Mr. Kaye and Mr. Landy was previously filed with the U.S. Securities & Exchange Commission on November 26, 2013 as an exhibit to a statement on Form 4 filed by Warburg Pincus Private Equity IX, L.P. with respect to Laredo Petroleum, Inc. (f/k/a Laredo Petroleum Holdings, Inc.) and is hereby incorporated by reference.

	WARBURG PINCUS PRIVATE EQUITY IX, L.P., By: Warburg Pincus IX GP LP, its GP, By: WPP GP LLC, its GP, By: Warburg Pincus Partners L.P., its MM, By: Warburg Pincus Partners GP LLC, its GP, By: Warburg Pincus & Co., its MM, By: /s/ Robert B. Knauss, Partner	05/25/2016
	WARBURG PINCUS IX GP L.P., By: WPP GP LLC, its GP, By: Warburg Pincus Partners, L.P., its Managing Member, By: Warburg Pincus Partners GP LLC, its GP, By: Warburg Pincus & Co., its Managing Member, By: /s/ Robert B. Knauss, Partner	05/25/2016
	WPP GP LLC, By: Warburg Pincus Partners, L.P., its Managing Member, By: Warburg Pincus Partners GP LLC, its General Partner, By: Warburg Pincus & Co., its Managing Member, By: /s/ Robert B. Knauss, Partner	05/25/2016
	WARBURG PINCUS PARTNERS, L.P., By: Warburg Pincus Partners GP LLC, its General Partner, By: Warburg Pincus & Co., its Managing Member, By: /s/ Robert B. Knauss, Partner	05/25/2016
	WARBURG PINCUS PARTNERS GP LLC, By: Warburg Pincus & Co., its Managing Member, By: /s/ Robert B. Knauss, Partner	05/25/2016
	WARBURG PINCUS & CO., By: /s/ Robert B. Knauss, Partner	05/25/2016
	WARBURG PINCUS LLC, By: /s/ Robert B. Knauss, Managing Director	05/25/2016
	CHARLES R. KAYE, By: /s/ Robert B. Knauss, Attorney-in-Fact*	05/25/2016
	JOSEPH P. LANDY, By: /s/ Robert B. Knauss, Attorney-in-Fact*	05/25/2016
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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