Statement of Changes of Beneficial Ownership

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
Washington, D.C. 20549

OMB Number: 3235-0287
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

1. Name and Address of Reporting Person *

Agroskin Daniel
2. Issuer Name and Ticker or Trading Symbol

Builders FirstSource, Inc. [ BLDR ]
5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

__ X __ Director                      _____ 10% Owner
_____ Officer (give title below)      _____ Other (specify below)
(Last)          (First)          (Middle)

3. Date of Earliest Transaction (MM/DD/YYYY)


NEW YORK, NY 10167
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ 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. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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   11/15/2017     A    5802   (1) A $0.00   5802   D    

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. 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 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 of Derivative Security: 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

Explanation of Responses:
(1)  Reflects the acquisition of restricted stock units pursuant to the Corporation's 2014 Incentive Plan. The restricted stock units vest on November 15, 2018 and entitle the reporting person to one share of common stock for each restricted stock unit that vests.

Reporting Owners
Reporting Owner Name / Address
Director 10% Owner Officer Other
Agroskin Daniel
SUITE 1601
NEW YORK, NY 10167

/s/ Jeffrey A. Wier, by power of attorney 11/17/2017
** 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.


KNOW ALL PERSONS BY THESE PRESENTS that the undersigned hereby authorizes, designates, and appoints Donald McAleenan and Jeffrey A. Wier 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 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 14th day of November, 2017.

By:     /s/ Daniel Agroskin