Builders FirstSource (BLDR) director reports 278-share stock award as compensation

Rhea-AI Filing Summary

Builders FirstSource director reports small stock grant as compensation. A director of Builders FirstSource, Inc. (BLDR) acquired 278 shares of common stock on December 1, 2025 at a price of $112.23 per share. These shares were received in lieu of cash fees for board service under the company’s 2014 Incentive Plan and Amended and Restated Director Compensation Policy.

Following this award, the director directly beneficially owns 44,647 shares of Builders FirstSource common stock. The filing does not show any sales or derivative security activity, only this routine equity-based compensation grant.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider ALEXANDER MARK A

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock, par value $0.01 per share	278	$112.23	$31K

Holdings After Transaction: Common Stock, par value $0.01 per share — 44,647 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^*

ALEXANDER MARK A

(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)
12/01/2025

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	12/01/2025		A(1)		278	A	$112.23	44,647	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 acquisition of shares in lieu of cash compensation for services as a director under the Corporation's 2014 Incentive Plan pursuant to the Corporation's Amended and Restated Director Compensation Policy.

	/s/ Minator Azemi, by power of attorney	12/03/2025
	** 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.
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) disclose in this filing?

The filing reports that a director of Builders FirstSource, Inc. acquired 278 shares of common stock on December 1, 2025 as compensation for board service, at a price of $112.23 per share.

How many Builders FirstSource (BLDR) shares does the reporting person own after this transaction?

After the reported transaction, the director directly beneficially owns 44,647 shares of Builders FirstSource common stock.

Was the Builders FirstSource (BLDR) insider transaction a purchase, sale, or grant?

It was an acquisition of 278 shares of Builders FirstSource common stock, received in lieu of cash compensation for services as a director under the company’s 2014 Incentive Plan and Amended and Restated Director Compensation Policy.

What was the reported price for the Builders FirstSource (BLDR) shares acquired?

The 278 shares of Builders FirstSource common stock were reported at a price of $112.23 per share.

Does this Builders FirstSource (BLDR) insider filing involve any derivative securities?

No derivative securities are reported. The filing’s activity is limited to common stock acquired as director compensation.

Why did the Builders FirstSource (BLDR) director receive stock instead of cash?

According to the explanation, the 278 shares reflect stock received in lieu of cash compensation for director services under the company’s 2014 Incentive Plan and its Amended and Restated Director Compensation Policy.