Builders FirstSource awards 7,406 RSUs to HR chief

O'Brien Matthew Coley reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

O'Brien Matthew Coley reported acquisition or exercise transactions in this Form 4 filing.

Builders FirstSource, Inc. reported that Chief Human Resources Officer Matthew Coley O'Brien received a grant of 7,406 restricted stock units under the corporation's 2026 Incentive Plan on 2026-07-18. These units vest in 33.3% increments on each of July 18, 2027, 2028 and 2029 and entitle him to one share of common stock for each unit that vests. After this award, he directly holds the equivalent of 7,406 shares tied to this grant.

Insider Trade Summary

Grant/Award: 7,406 shares

Grant/Award 1 txn

Insider O'Brien Matthew Coley

Role Chief Human Resources Officer

Type	Security	Shares	Price	Value
Grant/Award	Common Stock, par value $0.01 per share F1	7,406	$0.00	$0.00

Holdings After Transaction: Common Stock, par value $0.01 per share — 7,406 shares (Direct)

Footnotes (1)

1. F1. Reflects the acquisition of restricted stock units pursuant to the Corporation's 2026 Incentive Plan. The restricted stock units vest in 33.3% increments on each of July 18, 2027-2029 and entitle the reporting person to one share of common stock for each restricted stock unit that vests.

Key Figures

Restricted stock units granted: 7,406 units Grant price per share: $0.0000 per share Holdings after award: 7,406 shares +2 more

5 metrics

Restricted stock units granted 7,406 units Acquired on 2026-07-18 under the corporation's 2026 Incentive Plan

Grant price per share $0.0000 per share Reported transaction price for the RSU award

Holdings after award 7,406 shares Total common-stock-equivalent units following the reported transaction

Vesting percentage per tranche 33.3% Portion of RSUs vesting on each of July 18, 2027-2029

Vesting dates July 18, 2027-2029 Three annual vesting dates for the RSU grant

Key Terms

restricted stock units, 2026 Incentive Plan, vest

3 terms

restricted stock units financial

"Reflects the acquisition of restricted stock units pursuant to the Corporation's 2026 Incentive Plan."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

2026 Incentive Plan financial

"Reflects the acquisition of restricted stock units pursuant to 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.

vest financial

"The restricted stock units vest in 33.3% increments on each of July 18, 2027-2029."

A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.

FAQ

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

What insider transaction did BLDR executive Matthew Coley O'Brien report?

Matthew Coley O'Brien reported the acquisition of 7,406 restricted stock units of Builders FirstSource common stock. The grant was made under the 2026 Incentive Plan and represents an equity-based component of his executive compensation.

How many Builders FirstSource (BLDR) units were granted and at what price?

The filing shows a grant of 7,406 restricted stock units of Builders FirstSource, Inc. common stock at a reported price of $0.00 per share, consistent with a compensation award rather than an open-market purchase.

What is the vesting schedule for the BLDR restricted stock units granted to O'Brien?

The 7,406 restricted stock units vest in 33.3% increments on each of July 18, 2027, July 18, 2028, and July 18, 2029. Each vesting date unlocks a proportional portion of the award, subject to the plan’s terms.

What does each restricted stock unit represent for Builders FirstSource (BLDR)?

Each restricted stock unit entitles the reporting person to one share of Builders FirstSource common stock when it vests. This means the 7,406 units can convert into 7,406 shares over time as vesting conditions are met.

How did this grant affect Matthew Coley O'Brien’s BLDR equity holdings?

Following the reported transaction, Matthew Coley O'Brien is shown as directly holding 7,406 common-stock-equivalent units from this award. These units remain subject to the time-based vesting schedule through 2029 before becoming actual shares.

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

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Accepted by SEC EDGAR 07/21/2026 - 04:30 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^*

O'Brien Matthew Coley

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Human Resources Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/18/2026

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	07/18/2026		A(1)		7,406	A	$0.00	7,406	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 the acquisition of restricted stock units pursuant to the Corporation's 2026 Incentive Plan. The restricted stock units vest in 33.3% increments on each of July 18, 2027-2029 and entitle the reporting person to one share of common stock for each restricted stock unit that vests.

	/s/ Alena Brenner, by power of attorney	07/21/2026
	** 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)