Builders FirstSource (BLDR) EVP Brenner discloses 17,989 shares and RSU grant

Rhea-AI Filing Summary

Builders FirstSource, Inc. filed an initial ownership report for Alena Brenner, EVP, CLO and Corporate Secretary. The filing shows she directly holds 17,989 shares of common stock. A related footnote describes an acquisition of restricted stock units that vest 40% after one year, 40% after two years, and 20% after three years, with each vested unit delivering one share of common stock.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Brenner Alena

Role EVP, CLO and Corp. Sec.

Type	Security	Shares	Price	Value
holding	Common Stock, par value $0.01 per share	--	--	--

Holdings After Transaction: Common Stock, par value $0.01 per share — 17,989 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Common shares held: 17,989 shares First-year RSU vesting: 40% Second-year RSU vesting: 40% +2 more

5 metrics

Common shares held 17,989 shares Direct ownership following Form 3

First-year RSU vesting 40% RSUs vest on first anniversary of grant

Second-year RSU vesting 40% RSUs vest on second anniversary of grant

Third-year RSU vesting 20% RSUs vest on third anniversary of grant

Common stock par value $0.01 per share Par value of Builders FirstSource common stock

Key Terms

restricted stock units, 2014 Incentive Plan, vest, par value

4 terms

restricted stock units financial

"Reflects the acquisition of restricted stock units on April 30, 2026 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 on April 30, 2026 pursuant to the Corporation's 2014 Incentive Plan."

vest financial

"40% of the RSUs vest on the first anniversary of the grant, 40% of the RSUs vest on the second anniversary of the grant, and 20% of the RSUs vest on the third anniversary of the grant"

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.

par value financial

"Common Stock, par value $0.01 per share"

Par value is the fixed amount printed on a bond or stock that represents its original value when issued. It’s like the face value of a coin or bill—what the issuer promises to pay back or the starting price of a stock—though it often doesn’t change with market prices. It matters because it helps determine certain financial details, like how much the company will pay back at maturity.

Understanding Insider Trading Forms →

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

OMB APPROVAL

OMB Number:			3235-0104
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1. Name and Address of Reporting Person^*

Brenner Alena

(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)
04/20/2026

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)
	EVP, CLO and Corp. Sec.

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)
Common Stock, par value $0.01 per share	17,989(1)	D

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:

1. Reflects the acquisition of restricted stock units on April 30, 2026 pursuant to the Corporation's 2014 Incentive Plan. 40% of the RSUs vest on the first anniversary of the grant, 40% of the RSUs vest on the second anniversary of the grant, and 20% of the RSUs vest on the third anniversary of the grant 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	04/30/2026
	** 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 filing for Builders FirstSource (BLDR) report for Alena Brenner?

The Form 3 filing reports that EVP, CLO and Corporate Secretary Alena Brenner directly holds 17,989 shares of Builders FirstSource common stock. It also references newly acquired restricted stock units that vest over three years and convert into common shares upon vesting.

How many Builders FirstSource (BLDR) shares does Alena Brenner hold after this Form 3?

After this Form 3, Alena Brenner is reported as directly holding 17,989 shares of Builders FirstSource common stock. This figure reflects her beneficial ownership of common shares, separate from restricted stock units that vest into additional shares over time.

What are the vesting terms of Alena Brenner’s restricted stock units at Builders FirstSource (BLDR)?

The footnote states that Brenner’s restricted stock units vest 40% on the first anniversary of the grant, 40% on the second anniversary, and 20% on the third anniversary. Each vested restricted stock unit entitles her to receive one share of Builders FirstSource common stock.

Under which plan were Alena Brenner’s restricted stock units at Builders FirstSource (BLDR) granted?

The restricted stock units referenced in the Form 3 footnote were granted under Builders FirstSource’s 2014 Incentive Plan. This plan governs the terms of equity awards, including the vesting schedule and conversion of each restricted stock unit into one common share upon vesting.

Does the Form 3 for Builders FirstSource (BLDR) show any stock sales by Alena Brenner?

The Form 3 does not report any stock sales by Alena Brenner. It is an initial ownership statement showing her direct holding of 17,989 common shares and describing a grant of restricted stock units that will vest into additional common shares over several years.