Builders FirstSource (NYSE: BLDR) files Form 3 for Chief HR Officer Matthew O'Brien

Rhea-AI Filing Summary

Builders FirstSource, Inc. filed an initial Form 3 for Chief Human Resources Officer Matthew Coley O'Brien. The filing lists him as an executive officer but does not report any specific equity holdings or recent transactions in company securities.

Key Terms

Form 3, beneficial ownership, executive officer

3 terms

Form 3 regulatory

"filed an initial Form 3 for Chief Human Resources Officer"

Form 3 is the initial public filing that officers, directors and large shareholders must submit to report their ownership of a company’s securities when they become insiders. It acts like an opening inventory sheet that gives investors a starting point to see who holds significant stakes and to spot later trades or potential conflicts of interest, helping assess insider confidence and transparency.

beneficial ownership financial

"initial statement of beneficial ownership and does not list any specific transactions"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

executive officer financial

"identifies him as an executive officer and triggers ongoing reporting obligations"

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SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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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. Date of Event Requiring Statement (Month/Day/Year)
05/18/2026

3. Issuer Name and Ticker or Trading Symbol
Builders FirstSource, Inc. [ BLDR ]

3a. Foreign Trading Symbol

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

4. 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

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

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

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

No securities are beneficially owned.

	/s/ Minator Azemi, by power of attorney	05/27/2026
	** 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 5 (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 3: SEC 1473 (03-26)

FAQ

What does the Form 3 for BLDR Chief Human Resources Officer report?

The Form 3 for Builders FirstSource’s Chief Human Resources Officer Matthew Coley O'Brien identifies him as an executive officer. It serves as his initial statement of beneficial ownership and does not list any specific transactions or equity positions in the company’s securities.

Does the BLDR Form 3 for Matthew Coley O'Brien show any stock transactions?

No, the Form 3 for Matthew Coley O'Brien reports no stock transactions. The transaction summary shows zero buys, sells, exercises, gifts, tax withholdings, or restructurings, indicating there were no reportable trades in Builders FirstSource securities in this filing.

What role does Matthew Coley O'Brien hold at Builders FirstSource (BLDR)?

Matthew Coley O'Brien is listed as Chief Human Resources Officer of Builders FirstSource. The Form 3 confirms his status as an executive officer, which triggers ongoing reporting obligations for his ownership and transactions in the company’s equity securities under SEC rules.

Why is a Form 3 filed for a Builders FirstSource executive?

A Form 3 is filed when someone becomes an officer, director, or large shareholder subject to insider reporting rules. For Builders FirstSource, this filing records Matthew Coley O'Brien’s initial insider status so future Forms 4 or 5 can disclose his equity transactions and holdings.

Does the BLDR Form 3 disclose any derivative securities or options?

No, the Form 3 shows no derivative securities or options for Matthew Coley O'Brien. The derivative summary is empty and derivativeTransactionCount is zero, indicating there are no reportable option, warrant, or similar derivative positions disclosed in this filing.