Builders FirstSource, Inc.

For the period ended Sep 30, 2026. Filed Oct 29, 2026.

About this filing

A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.

Sep 30, 2026 · Filed Oct 29, 2026

BLDR$65.97+5.5%Stored close · as of Nov 9, 2026

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Contents

Item 6. Exhibits

	Description
3.1	Amended and Restated Certificate of Incorporation of Builders FirstSource, Inc. (incorporated by reference to Exhibit 3.1 to the Company’s Current Report on Form 8-K, filed with the Securities and Exchange Commission on May 27, 2025, File Number 001-40620)
3.2	Amended and Restated By-Laws of Builders FirstSource, Inc. (incorporated by reference to Exhibit 3.2 to the Company’s Current Report on Form 8-K, filed with the Securities and Exchange Commission on May 27, 2025, File Number 001-40620)
10.1+*	Form of Restricted Stock Unit Award Certificate (Time-Based) under the Builders FirstSource, Inc. 2026 Equity Incentive Plan
10.2+*	Form of Restricted Stock Unit Award Certificate (Time-Based and Performance-Based) under the Builders FirstSource, Inc. 2026 Equity Incentive Plan
31.1*	Certification of Chief Executive Officer pursuant to 17 CFR 240.13a-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, signed by Peter M. Jackson as Chief Executive Officer
31.2*	Certification of Chief Financial Officer pursuant to 17 CFR 240.13a-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, signed by Pete R. Beckmann as Chief Financial Officer
32.1**	Certification of Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, signed by Peter M. Jackson as Chief Executive Officer and Pete R. Beckmann as Chief Financial Officer
101*	The following financial information from Builders FirstSource, Inc.’s Form 10-Q filed on October 29, 2026 formatted in Inline eXtensible Business Reporting Language (“Inline XBRL”): (i) Condensed Consolidated Statement of Operations for the three and nine months ended September 30, 2026 and 2025, (ii) Condensed Consolidated Balance Sheet as of September 30, 2026 and December 31, 2025, (iii) Condensed Consolidated Statements of Cash Flows for the nine months ended September 30, 2026 and 2025, (iv) Condensed Consolidated Statements of Changes in Stockholders’ Equity for the three and nine months ended September 30, 2026 and 2025 and (v) the Notes to Condensed Consolidated Financial Statements.
104*	The cover page for the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2026, has been formatted in Inline XBRL.

Filed herewith.

** Builders FirstSource, Inc. is furnishing, but not filing, the written statement pursuant to Title 18 United States Code 1350, as added by Section 906 of the Sarbanes-Oxley Act of 2002, of Peter M. Jackson, our Chief Executive Officer, and Pete R. Beckmann, our Chief Financial Officer.

Indicates a management contract or compensatory plan or arrangement.

SIGNAT URES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

BUILDERS FIRSTSOURCE, INC.

/s/ PETER M. JACKSON

Peter M. Jackson

President and Chief Executive Officer

(Principal Executive Officer)

/s/ PETE R. BECKMANN

Pete R. Beckmann

Executive Vice President and Chief Financial Officer(Principal Financial Officer)

/s/ MATTHEW TRESTER

Matthew Trester

Vice President and Controller

(Principal Accounting Officer)

ContentsView on SEC.gov

The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.