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

Rhea-AI Filing Summary

Builders FirstSource insider transaction: Director Mark A. Alexander acquired 225 shares of Builders FirstSource, Inc. (ticker BLDR) on 09/01/2025 as described on the Form 4. The shares were received in lieu of cash compensation under the company’s 2014 Incentive Plan pursuant to the Amended and Restated Director Compensation Policy. The reported acquisition price per share was $138.68. Following the transaction, the reporting person beneficially owned 44,369 shares. The Form 4 was signed by an authorized attorney on 09/03/2025.

Insights

Corporate Governance Expert

TL;DR: Routine director stock-for-fees award aligning director pay with shareholder interests; not a material corporate event.

This Form 4 documents a standard compensation election where a director accepted equity instead of cash, consistent with common governance practices to align incentives. The grant size (225 shares) and resulting beneficial ownership (44,369 shares) suggest a modest increase in insider stake rather than a controlling change. There is no indication of option exercises, dispositions, or material corporate actions linked to this filing.

Securities Analyst

TL;DR: Small equity grant recorded; transaction provides transparency but is unlikely to affect valuation materially.

The transaction price reported ($138.68 per share) reflects the value attributed to the shares received for director compensation. Because the filing shows an acquisition of a relatively small number of shares and does not report any sales or derivative activity, its market impact is expected to be negligible. The filing contains clear disclosure of the compensation plan basis for the issuance.

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
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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).

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)
09/01/2025

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	09/01/2025		A(1)		225	A	$138.68	44,369	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	09/03/2025
	** 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 did BLDR director Mark A. Alexander report on the Form 4?

The Form 4 reports that Mark A. Alexander acquired 225 shares of Builders FirstSource (BLDR) on 09/01/2025 as director compensation.

Why were the 225 BLDR shares issued to the director?

The shares were issued in lieu of cash compensation under the company's 2014 Incentive Plan and the Amended and Restated Director Compensation Policy.

What price per share was reported for the BLDR acquisition?

The reported price per share for the acquisition was $138.68.

How many BLDR shares does the reporting person own after this transaction?

Following the transaction the reporting person beneficially owned 44,369 shares.

When was the Form 4 signed and filed?

The signature block shows the form was signed by power of attorney on 09/03/2025.