Builders FirstSource director granted 2,558 RSUs

Builders FirstSource, Inc. director Brett N. Milgrim reported an award of 2,558 shares in the form of restricted stock units under the company’s 2014 Incentive Plan.

Rhea-AI Filing Summary

Builders FirstSource, Inc. director Brett N. Milgrim reported an award of 2,558 shares in the form of restricted stock units under the company’s 2014 Incentive Plan. The units were granted at no cash cost and will vest on May 14, 2027, each converting into one common share when vested.

Following this equity award, Milgrim directly holds a total of 82,634 shares of Builders FirstSource common stock. This filing reflects routine stock-based compensation rather than an open-market purchase or sale.

Insider Trade Summary

Grant/Award: 2,558 shares

Grant/Award 1 txn

Insider MILGRIM BRETT N

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock, par value $0.01 per share	2,558	$0.00	$0.00

Holdings After Transaction: Common Stock, par value $0.01 per share — 82,634 shares (Direct)

Footnotes (1)

1. F1. Reflects the acquisition of restricted stock units pursuant to the Corporation's 2014 Incentive Plan. The restricted stock units vest on May 14, 2027 and entitle the reporting person to one share of common stock for each restricted stock unit that vests.

Key Figures

RSU grant size: 2,558 units Grant price per share: $0.00 per share Shares after transaction: 82,634 shares +1 more

4 metrics

RSU grant size 2,558 units Restricted stock units granted to director Brett N. Milgrim

Grant price per share $0.00 per share Reported transaction price for the RSU award

Shares after transaction 82,634 shares Total common stock directly held after award

RSU vesting date May 14, 2027 Vesting date for the 2,558 restricted stock units

Key Terms

restricted stock units, 2014 Incentive Plan, vest

3 terms

restricted stock units financial

"Reflects the acquisition of restricted stock units pursuant to the Corporation's 2014 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.

2014 Incentive Plan financial

"Reflects the acquisition of restricted stock units pursuant to the Corporation's 2014 Incentive Plan."

vest financial

"The restricted stock units vest on May 14, 2027 and entitle the reporting person to one share of common stock for each restricted stock unit that vests."

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 Builders FirstSource (BLDR) report for Brett N. Milgrim?

Builders FirstSource director Brett N. Milgrim received an award of 2,558 restricted stock units. These units are a form of stock-based compensation, not an open-market purchase, and each unit will convert into one share of common stock upon vesting.

How many Builders FirstSource (BLDR) shares does Brett N. Milgrim hold after this Form 4 filing?

After the reported award, Brett N. Milgrim directly holds 82,634 shares of Builders FirstSource common stock. This total includes the impact of the newly granted 2,558 restricted stock units disclosed in the filing as part of his director compensation.

What is the size of the restricted stock unit grant reported for BLDR director Brett N. Milgrim?

The filing shows an equity award of 2,558 restricted stock units to director Brett N. Milgrim. These units were granted at no stated cash price per share under Builders FirstSource’s 2014 Incentive Plan as part of his compensation package.

When do Brett N. Milgrim’s newly granted restricted stock units in Builders FirstSource vest?

The 2,558 restricted stock units awarded to Brett N. Milgrim vest on May 14, 2027. On that vesting date, each restricted stock unit entitles him to receive one share of Builders FirstSource common stock, subject to the award’s terms and conditions.

Is the Form 4 transaction for BLDR an insider purchase or a compensation award?

The transaction is a compensation-related award, not an open-market purchase. Brett N. Milgrim received 2,558 restricted stock units at a reported price of $0.00 per share under Builders FirstSource’s 2014 Incentive Plan, reflecting routine equity compensation for a director.

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

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Accepted by SEC EDGAR 05/18/2026 - 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^*

MILGRIM BRETT N

(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)
05/14/2026

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	05/14/2026		A		2,558(1)	A	$0	82,634	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 2014 Incentive Plan. The restricted stock units vest on May 14, 2027 and entitle the reporting person to one share of common stock for each restricted stock unit that vests.

	/s/ Minator Azemi, by power of attorney	05/18/2026
	** 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)