Builders FirstSource director gets 564 shares

BLDR director Craig Arthur Steinke received stock-based director fees, increasing his direct holdings to just over 102,000 shares.

Rhea-AI Filing Summary

Builders FirstSource, Inc. (BLDR) reported that director Craig Arthur Steinke acquired 564 shares of common stock on September 10, 2026 as a grant in lieu of cash fees for board service. The award was made under the company's 2026 Incentive Plan, bringing his directly held stake to 102,626 shares.

Insider Trade Summary

Grant/Award: 564 shares

Grant/Award 1 txn

Insider Steinke Craig Arthur

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock, par value $0.01 per share F1	564	$0.00	$0.00

Holdings After Transaction: Common Stock, par value $0.01 per share — 102,626 shares (Direct)

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 acquired: 564 shares Price per share for grant: $0.00 per share Shares owned after transaction: 102,626 shares

3 metrics

Shares acquired 564 shares Grant in lieu of cash director compensation on September 10, 2026

Price per share for grant $0.00 per share Reported for the 564-share director compensation grant

Shares owned after transaction 102,626 shares Direct holdings of Craig Arthur Steinke following the grant

Key Terms

2026 Incentive Plan, Amended and Restated Director Compensation Policy, Rule 10b5-1 plan

3 terms

2026 Incentive Plan financial

"acquisition of shares in lieu of cash compensation for services as a director under the Corporation's 2026 Incentive Plan"

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"

Rule 10b5-1 plan regulatory

"The filing’s Rule 10b5-1 checkbox is not marked affirmatively"

A Rule 10b5-1 plan is a prearranged, written schedule that lets corporate insiders buy or sell company stock at set times or amounts, even if they later learn material nonpublic information. Think of it like setting an automatic thermostat for trades: it creates a clear record that trades were planned in advance, reducing the risk of insider-trading accusations and helping investors trust that insider transactions are routine rather than based on secret information.

FAQ

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

What insider transaction did BLDR director Craig Arthur Steinke report?

Craig Arthur Steinke reported an acquisition of 564 shares of Builders FirstSource common stock on September 10, 2026, received as a grant in lieu of cash director compensation under the company’s 2026 Incentive Plan.

How many Builders FirstSource (BLDR) shares does Craig Arthur Steinke own after this transaction?

After the September 10, 2026 grant, Craig Arthur Steinke directly owns 102,626 shares of Builders FirstSource common stock, as reported in the Form 4 filing.

Was cash paid for the BLDR shares acquired by Craig Arthur Steinke?

No. The 564 shares were acquired at a reported price of $0.00 per share as stock issued in lieu of cash compensation for services as a director under Builders FirstSource’s director compensation policy.

Were Craig Arthur Steinke’s BLDR transactions made under a Rule 10b5-1 trading plan?

No. The filing’s Rule 10b5-1 checkbox is not marked affirmatively, and there is no footnote indicating that this 564-share grant was made pursuant to a Rule 10b5-1 trading plan.

What plan governed the stock grant to BLDR director Craig Arthur Steinke?

The 564-share grant to Craig Arthur Steinke was made under Builders FirstSource’s 2026 Incentive Plan, pursuant to the company’s Amended and Restated Director Compensation Policy, and was provided in lieu of cash director fees.

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

Form 4 Insider Transactions: What Each Field Means →

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Available on EDGAR 09/14/2026 - 04:06 PM EDT Accepted by SEC EDGAR 09/14/2026 - 04:05 PM EDT 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^*

Steinke Craig Arthur

(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)		564	A	$0.00	102,626	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/ 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)