[Form 4] Builders FirstSource, Inc. Insider Trading Activity

Rhea-AI Filing Summary

David E. Rush, a director of Builders FirstSource, Inc. (BLDR), reported two equity transactions dated 10/01/2025. The filing shows 24,307 shares of common stock were acquired upon vesting of performance-based restricted stock units at a reported price of $121.25, resulting in total beneficial ownership of 144,018 shares immediately after that transaction.

The filing also discloses 13,402 shares were disposed of (withheld) to satisfy tax withholding on vesting of performance-based and previously granted restricted stock units at the same reported price of $121.25130,616 shares following the withholding. The transactions were reported on Form 4 and signed by power of attorney on 10/03/2025. The filing states the acquisitions reflect vesting under the company's 2014 Incentive Plan and the disposals reflect tax withholding.

10/03/2025 - 04:05 PM

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

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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^*

Rush David E

(Last) (First) (Middle)

C/O BUILDERS FIRSTSOURCE, INC.

6031 CONNECTION DR., STE. 400

(Street)

IRVING TX 75039

(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)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
10/01/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

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. 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	10/01/2025		A		24,307(1)	A	$121.25	144,018	D
Common Stock, par value $0.01 per share	10/01/2025		F		13,402(2)	D	$121.25	130,616	D

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

Explanation of Responses:

1. Reflects the vesting of performance-based restricted stock units granted pursuant to the Corporation's 2014 Incentive Plan.

2. Reflects shares withheld to pay tax withholding requirements on vesting of performance-based restricted stock units and previously granted restricted stock units.

	/s/ Minator Azemi, by power of attorney	10/03/2025
	** 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.
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FAQ

What insider transactions did BLDR director David E. Rush report on Form 4?

The Form 4 reports the vesting acquisition of 24,307 shares and the withholding disposal of 13,402 shares, both dated 10/01/2025.

Why were 13,402 shares disposed of according to the Form 4 for BLDR?

The filing states 13,402 shares were withheld to pay tax withholding requirements on vesting of performance-based and previously granted restricted stock units.

What was the reported price per share for the transactions in the BLDR Form 4?

Both the acquisition and the withholding are reported at a price of $121.25 per share.

How many BLDR shares did David E. Rush beneficially own after the transactions?

The filing shows beneficial ownership of 144,018 shares after the vesting acquisition and 130,616 shares after the tax-withholding disposal.

Under what plan did the vested shares arise according to the filing?

The filing explains the 24,307 vested shares reflect performance-based restricted stock units granted under the company's 2014 Incentive Plan.