Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN 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 *
STADIUM CAPITAL MANAGEMENT LLC
   2. Issuer Name and Ticker or Trading Symbol
Builders FirstSource, Inc. [BLDRR] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
19785 VILLAGE OFFICE COURT, STE 101		 3. Date of Earliest Transaction (Month/Day/Year)
12/30/2009
(Street)

BEND, OR 97702		 4. If Amendment, Date 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
(City)
(State)
(Zip)
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

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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 Underlying Securities
(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
Subscription Rights (right to buy) $ 3.5 12/30/2009   S     100 12/14/2009 01/14/2010 Common Stock 100 $ 0.42 8,647,133 I See Footnotes (1) (2)

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
STADIUM CAPITAL MANAGEMENT LLC
19785 VILLAGE OFFICE COURT
STE 101
BEND, OR 97702		     X    
KENT BRADLEY R
C/O STADIUM CAPITAL MANAGEMENT, LLC
19785 VILLAGE OFFICE COURT, SUITE 101
BEND, OR 97702		     X    
SEAVER ALEXANDER M
C/O STADIUM CAPITAL MANAGEMENT, LLC
19785 VILLAGE OFFICE COURT, SUITE 101
BEND, OR 97702		     X    

Signatures

 Stadium Capital Management, LLC by Bradley R. Kent, Manager   01/04/2010
**Signature of Reporting Person Date
 Bradley R. Kent   01/04/2010
**Signature of Reporting Person Date
 Alexander M. Seaver   01/04/2010
**Signature of Reporting Person Date

Explanation of Responses:

* 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).
(1) The securities reported as beneficially owned by Stadium Capital Management, LLC ("SCM"), Bradley R. Kent ("Kent") and Alexander M. Seaver ("Seaver") on this Form 4 include securities also beneficially owned by investment advisory clients of SCM, including investment limited partnerships (the "Funds") of which SCM is the general partner and investment adviser. Kent and Seaver are the Managers of SCM.
(2) SCM, Kent and Seaver disclaim membership in a group, within the meaning of Rule 13d-5(b) and Rule 16a-1(a)(1) under the Securities Exchange Act of 1934, as amended, with any other person. These securities are held directly by such investment advisory clients, including the Funds, for the benefit of such clients and the investors in those Funds. SCM, Kent and Seaver disclaim beneficial ownership of such securities, except to the extent of their pecuniary interest therein.

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