David E. Rush - 01 Oct 2025 Form 4 Insider Report for Builders FirstSource, Inc. (BLDR)

Role: Director
Signature: /s/ Minator Azemi, by power of attorney
Issuer symbol: BLDR
Transactions as of: 01 Oct 2025
Net transactions value: +$1,322,231
Form type: 4
Filing time: 03 Oct 2025, 16:05:05 UTC
Previous filing: 06 Aug 2025
Next filing: 07 Nov 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Rush David E	Director	C/O BUILDERS FIRSTSOURCE, INC., 6031 CONNECTION DR., STE. 400, IRVING	/s/ Minator Azemi, by power of attorney	03 Oct 2025	0001760672

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	BLDR	Common Stock, par value $0.01 per share	Award	$2,947,224	+24,307	+20%	$121.25	144,018	01 Oct 2025	Direct	F1
transaction	BLDR	Common Stock, par value $0.01 per share	Tax liability	$1,624,992	-13,402	-9.3%	$121.25	130,616	01 Oct 2025	Direct	F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Reflects the vesting of performance-based restricted stock units granted pursuant to the Corporation's 2014 Incentive Plan.
F2	Reflects shares withheld to pay tax withholding requirements on vesting of performance-based restricted stock units and previously granted restricted stock units.