Builders FirstSource director granted 583 shares

BLDR director William B. Hayes accepted stock in place of cash director fees, increasing both his direct and trust-held share positions.

Rhea-AI Filing Summary

Builders FirstSource, Inc. (symbol: BLDR) is the issuer of record for a Form 4 filing submitted to the SEC. Hayes William B reported acquisition or exercise transactions in this Form 4 filing.

Builders FirstSource, Inc. (BLDR) director William B. Hayes received an award of 583 shares of common stock on September 10, 2026, as stock compensation in lieu of cash fees for board service under the company’s 2026 Incentive Plan and Amended and Restated Director Compensation Policy. Following this grant he directly holds 20,221 shares of common stock, and an additional 14,593 shares are held indirectly through a Spousal Lifetime Access Trust.

Insider Trade Summary

Grant/Award: 583 shares

Grant/Award 2 txns

Insider Hayes William B

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock, par value $0.01 per share F1	583	$0.00	$0.00
holding	Common Stock, par value $0.01 per share	--	--	--

Holdings After Transaction: Common Stock, par value $0.01 per share — 20,221 shares (Direct); Common Stock, par value $0.01 per share — 14,593 shares (Indirect, By Spousal Lifetime Access Trust)

Footnotes (1)

1. F1. 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.

Key Figures

Shares granted as stock compensation: 583 shares Direct common shares after grant: 20,221 shares Indirect common shares held via trust: 14,593 shares +2 more

5 metrics

Shares granted as stock compensation 583 shares Award of common stock on September 10, 2026 in lieu of cash director fees

Direct common shares after grant 20,221 shares Direct holdings of William B. Hayes following the September 10, 2026 award

Indirect common shares held via trust 14,593 shares Shares held for William B. Hayes by a Spousal Lifetime Access Trust

Reported price per share for award $0.00 per share Compensatory stock award granted instead of cash fees on September 10, 2026

Total reported positions (direct and indirect entries) 2 positions One direct holding line and one trust-held line of common stock

Key Terms

Spousal Lifetime Access Trust, 2026 Incentive Plan, Amended and Restated Director Compensation Policy

3 terms

Spousal Lifetime Access Trust financial

"By Spousal Lifetime Access Trust"

2026 Incentive Plan financial

"under the Corporation's 2026 Incentive Plan pursuant to the Corporation's Amended"

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"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did BLDR director William B. Hayes report on this Form 4?

William B. Hayes reported receiving 583 shares of Builders FirstSource common stock on September 10, 2026, as a stock award for his services as a director, taken in lieu of cash compensation under the company’s 2026 Incentive Plan and Amended and Restated Director Compensation Policy.

How many BLDR shares does William B. Hayes own directly after this reported grant?

After the September 10, 2026 stock award, William B. Hayes directly holds 20,221 shares of Builders FirstSource common stock. This figure reflects his direct ownership position immediately following the reported grant taken in lieu of cash director fees.

What is the nature of the indirect BLDR share holdings reported for William B. Hayes?

In addition to his direct holdings, 14,593 shares of Builders FirstSource common stock are reported as held indirectly for William B. Hayes through a Spousal Lifetime Access Trust, indicating these shares are owned via an estate-planning trust structure rather than in his own name.

Did William B. Hayes buy BLDR shares in the market in this Form 4?

No. The Form 4 shows an award of 583 shares of Builders FirstSource common stock as compensation for board service, taken instead of cash, rather than a market purchase. The reported transaction price per share is listed as zero, consistent with a compensatory equity grant.

Was a Rule 10b5-1 trading plan involved in this BLDR Form 4 transaction?

No Rule 10b5-1 trading plan is indicated for this Form 4. The award of 583 shares to William B. Hayes is described as compensation in stock in lieu of cash under the company’s director compensation arrangements, not as part of a pre-arranged trading plan.

What compensation programs at BLDR are referenced in William B. Hayes’s Form 4?

The Form 4 references Builders FirstSource’s 2026 Incentive Plan and its Amended and Restated Director Compensation Policy. The 583-share stock award to William B. Hayes was granted under these programs instead of paying his director fees in cash.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/14/2026 - 04:06 PM Accepted by SEC EDGAR 09/14/2026 - 04:05 PM Learn about SEC filing dates

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^*

Hayes William B

(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)
09/10/2026

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	09/10/2026		A(1)		583	A	$0.00	20,221	D
Common Stock, par value $0.01 per share								14,593	I	By Spousal Lifetime Access Trust

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/ Alena Brenner, by power of attorney	09/14/2026
	** 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)