Director Mark A. Alexander receives 409-share BLDR (NYSE: BLDR) stock award

Rhea-AI Filing Summary

Builders FirstSource, Inc. director Mark A. Alexander received a grant of common stock as part of his board compensation. On June 1, 2026, he acquired 409 shares of common stock at a reference value of $76.26 per share, given in lieu of cash fees under the company’s 2026 Incentive Plan and its Amended and Restated Director Compensation Policy. After this award, he directly holds 47,913 shares of Builders FirstSource common stock.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider ALEXANDER MARK A

Role null

Type	Security	Shares	Price	Value
Grant/Award	Common Stock, par value $0.01 per share	409	$76.26	$31K

Holdings After Transaction: Common Stock, par value $0.01 per share — 47,913 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Stock grant size: 409 shares Grant reference price: $76.26 per share Post-transaction holdings: 47,913 shares

3 metrics

Stock grant size 409 shares Common stock award on June 1, 2026

Grant reference price $76.26 per share Transaction price per share for the award

Post-transaction holdings 47,913 shares Total common shares held after the grant

Key Terms

2026 Incentive Plan, Amended and Restated Director Compensation Policy, Common Stock, par value $0.01 per share

3 terms

2026 Incentive Plan financial

"under the Corporation's 2026 Incentive Plan pursuant to the Corporation's Amended and Restated Director Compensation Policy"

A 2026 incentive plan is a company’s formal program, often named for a year, that authorizes awards like stock options, restricted shares, and cash bonuses to employees and executives to motivate performance and retain talent. For investors it matters because the plan creates potential new shares or payouts that can dilute existing ownership and align management’s choices with company goals—think of it as a reward budget that affects both pay incentives and share value.

Amended and Restated Director Compensation Policy financial

"pursuant to the Corporation's Amended and Restated Director Compensation Policy"

Common Stock, par value $0.01 per share financial

"security_title: Common Stock, par value $0.01 per share"

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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 TEXAS 75039

(City) (State) (Zip)

UNITED STATES

(Country)

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)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/01/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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

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	06/01/2026		A(1)		409	A	$76.26	47,913	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 2026 Incentive Plan pursuant to the Corporation's Amended and Restated Director Compensation Policy.

	/s/ Minator Azemi, by power of attorney	06/02/2026
	** 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.
* Form 4: SEC 1474 (03-26)

FAQ

What did BLDR director Mark A. Alexander report in this Form 4?

Mark A. Alexander reported receiving an award of 409 shares of Builders FirstSource common stock. The shares were granted as part of his compensation for serving as a director under the company’s 2026 Incentive Plan and its director compensation policy.

Was the BLDR Form 4 transaction a market purchase or a stock grant?

The Form 4 for BLDR shows a stock grant/award acquisition, not a market purchase. The 409 shares were issued in lieu of cash compensation for director services under the company’s incentive and director compensation programs.

At what value were the Builders FirstSource shares granted to the director?

The 409 Builders FirstSource shares were recorded at $76.26 per share. This value is disclosed in the Form 4 as the transaction price per share for the grant reported on June 1, 2026.

How many BLDR shares does Mark A. Alexander own after this Form 4 transaction?

Following the stock grant, Mark A. Alexander directly owns 47,913 shares of Builders FirstSource common stock. This post-transaction holding figure is disclosed in the Form 4 as total shares beneficially owned after the reported award.

Why did the BLDR director receive shares instead of cash compensation?

The Form 4 footnote states the 409 shares were issued in lieu of cash compensation for board service. The award was made under Builders FirstSource’s 2026 Incentive Plan and its Amended and Restated Director Compensation Policy.