# EDGAR Filing Document

**Accession Number:** 0001316835
**File Stem:** 0001851662-26-000005
**Filing Date:** 2026-4
**Character Count:** 6595
**Document Hash:** 228f0dca5eb3f17318a9d0d7dc4f7443
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001851662-26-000005.hdr.sgml**: 20260430

**ACCESSION NUMBER**: 0001851662-26-000005

**CONFORMED SUBMISSION TYPE**: 3

**PUBLIC DOCUMENT COUNT**: 2

**CONFORMED PERIOD OF REPORT**: 20260420

**FILED AS OF DATE**: 20260430

**DATE AS OF CHANGE**: 20260430

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Brenner Alena
- **CENTRAL INDEX KEY:** 0001851662

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-40620
- **FILM NUMBER:** 26925013

**MAIL ADDRESS:**
- **STREET 1:** 5020 WESTON PARKWAY, SUITE 400
- **CITY:** CARY
- **STATE:** NC
- **ZIP:** 27513
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Builders FirstSource, Inc.
- **CENTRAL INDEX KEY:** 0001316835
- **STANDARD INDUSTRIAL CLASSIFICATION:** RETAIL-LUMBER & OTHER BUILDING MATERIALS DEALERS [5211]
- **ORGANIZATION NAME:** 07 Trade & Services
- **EIN:** 522084569
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 6031 CONNECTION DR., STE. 400
- **CITY:** IRVING
- **STATE:** TX
- **ZIP:** 75039
- **BUSINESS PHONE:** (214) 880-3500

**MAIL ADDRESS:**
- **STREET 1:** 6031 CONNECTION DR., STE. 400
- **CITY:** IRVING
- **STATE:** TX
- **ZIP:** 75039

## Ex-24

POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS that the undersigned hereby authorizes, designates, and appoints Minator Azemi as such person's true and lawful attorney-in-fact and agent, with full power of substitution and resubstitution and full power to act, for the undersigned and in the undersigned's name, place, and stead, to execute, acknowledge, deliver, and file any and all statements required to be filed with the United States Securities and Exchange Commission (the "Commission") by the undersigned pursuant to 1) Section 16 of the Securities Exchange Act of 1934 (the "1934 Act") or 2) Rule 144 promulgated under the Securities Act of 1933 (the "1933 Act"), and the rules and regulations thereunder with respect to securities of Builders FirstSource, Inc., a Delaware corporation, including, without limitation, statements on Form ID (including the retrieval and regeneration of lost EDGAR codes), Form 3, Form 4, Form 5 and Form 144 (and any amendments thereto) and any successor forms adopted by the Commission, as required by the 1934 Act or the 1933 Act and the rules and regulations thereunder, and to take such other actions as such attorneys-in-fact may deem necessary or appropriate in connection with such statements, including serving as the undersigned's EDGAR Account Administrator.

This power of attorney shall continue in effect until the undersigned no longer has an obligation to file statements under Section 16 of the 1934 Act or Rule 144 under the 1933 Act, or until specifically terminated in writing by the undersigned. The undersigned acknowledges that the aforesaid persons are not assuming any of the undersigned's responsibilities to comply with Section 16 of the 1934 Act or Rule 144 under the 1933 Act.

IN WITNESS WHEREOF, the undersigned has duly executed this power of attorney on the 20th day of April, 2026.

By: /s/ Alena Brenner

Alena Brenner

------

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

## FORM 3

### INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Brenner Alena<br><sub>(Last) (First) (Middle)</sub><br>C/O BUILDERS FIRSTSOURCE, INC.<br>6031 CONNECTION DR, STE 400<br><sub>(Street)</sub><br>IRVING, TX 75039<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Builders FirstSource, Inc. [ BLDR ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2026-04-20 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director   [ ] 10% Owner<br>[X] Officer (give title below)   [ ] Other (specify below)<br>_EVP, CLO and Corp. Sec._ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities Beneficially Owned

---

|  |  |  |  |
| --- | --- | --- | --- |
| 1. Title of Security | 2. Amount of Securities Beneficially Owned | 3. Ownership Form | 4. Nature of Indirect Beneficial Ownership |
| Common Stock, par value $0.01 per share | 17989<sup>(1)</sup> | D |  |

---

## Table II - Derivative Securities Beneficially Owned

---

|  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 3. Title and Amount of Underlying Securities | 3. Title and Amount of Underlying Securities | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
|  |  |  |  |  |  |  |  |

---

### Footnotes:

(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.

**Signature:** /s/ Minator Azemi, by power of attorney  
**Date:** 2026-04-30

### Remarks:

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.**