FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person *   Rush David E 2. Date of Event Requiring Statement (Month/Day/Year) 11/29/2018 3. Issuer Name and Ticker or Trading Symbol Builders FirstSource, Inc. [BLDR] (Last) (First) (Middle) 2001 BRYAN ST., SUITE 1600 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) SVP - COO - East 5. If Amendment, Date Original Filed(Month/Day/Year) (Street) DALLAS, TX 75201 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Beneficially Owned

1.Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5) Common Stock, par value $0.01 per share 10,663 D   Common Stock, par value $0.01 per share 3,758 (1) D   Common Stock, par value $0.01 per share 5,480 (2) D   Common Stock, par value $0.01 per share 6,489 (3) D Â

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.			SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Employee Stock Option (right to buy)	  (4)	02/11/2024	Common Stock	31,108	$ 7.67	D	Â

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Rush David E 2001 BRYAN ST., SUITE 1600 DALLAS, TX 75201	Â	Â	  SVP - COO - East	Â

Signatures

/s/ Jeffrey A. Wier, by power of attorney		12/07/2018
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 5(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).
(1)	Reflects restricted stock units acquired by the reporting person on January 4, 2016 pursuant to the Corporation's 2014 Incentive Plan. The restricted stock units vest on January 3, 2019 and entitle the reporting person to one share of common stock for each restricted stock unit that vests.
(2)	Reflects restricted stock units acquired by the reporting person on March 1, 2017 pursuant to the Corporation's 2014 Incentive Plan. The restricted stock units vest in 50% increments on each of March 1, 2019-2020 and entitle the reporting person to one share of common stock for each restricted stock unit that vests.
(3)	Reflects restricted stock units acquired by the reporting person on March 1, 2018 pursuant to the Corporation's 2014 Incentive Plan. The restricted stock units vest in 33.3% increments on each of March 1, 2019-2021 and entitle the reporting person to one share of common stock for each restricted stock unit that vests.
(4)	Employee stock option granted pursuant to the Corporation's 2007 Incentive Plan. The grant vested in 25% increments on each of February 11, 2015-2018.

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