Tax withholding trims Builders FirstSource (BLDR) director share stake

Rhea-AI Filing Summary

Builders FirstSource director David E. Rush reported a routine tax-related share disposition. On March 15, 2026, 2,332 shares of common stock were withheld at $88.09 per share to cover tax obligations on the vesting of previously granted restricted stock units. After this withholding, Rush directly holds 127,284 shares of Builders FirstSource common stock. This transaction reflects tax withholding, not an open-market sale.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Rush David E

Role Director

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock, par value $0.01 per share	2,332	$88.09	$205K

Holdings After Transaction: Common Stock, par value $0.01 per share — 127,284 shares (Direct)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

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)
03/15/2026

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	03/15/2026		F(1)		2,332	D	$88.09	127,284	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 shares withheld to pay tax withholding requirements on vesting of previously granted restricted stock units.

	/s/ Minator Azemi, by power of attorney	03/17/2025
	** 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.
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 Number.

FAQ

What insider transaction did Builders FirstSource (BLDR) director David E. Rush report?

David E. Rush reported a tax-withholding share disposition. On March 15, 2026, 2,332 Builders FirstSource common shares were withheld at $88.09 per share to satisfy tax obligations arising from the vesting of previously granted restricted stock units.

Was the Builders FirstSource Form 4 transaction an open-market sale?

No, the transaction was not an open-market sale. The 2,332 shares were withheld by the company to cover tax withholding requirements on vesting restricted stock units, a standard administrative process rather than a discretionary sale into the market.

How many Builders FirstSource shares does David E. Rush hold after this Form 4?

David E. Rush directly holds 127,284 shares after the transaction. Following the 2,332-share tax withholding related to restricted stock unit vesting, his reported direct ownership in Builders FirstSource common stock stands at 127,284 shares.

What price per share was used for the tax withholding in the Builders FirstSource filing?

The tax withholding used a price of $88.09 per share. The Form 4 states that 2,332 shares of Builders FirstSource common stock were withheld at $88.09 each to satisfy tax obligations tied to restricted stock unit vesting.

What does transaction code "F" mean in the Builders FirstSource Form 4?

Transaction code “F” indicates a tax-withholding disposition. In this case, shares of Builders FirstSource common stock were delivered or withheld to pay tax liabilities triggered by the vesting of previously granted restricted stock units, rather than being sold on the open market.