Builders FirstSource, Inc. (NYSE:BLDR) ("Builders FirstSource" or the "Company") today announced the appointment of Alena Brenner as Executive Vice President, Chief Legal Officer and Corporate Secretary, reporting to CEO Peter Jackson. Ms. Brenner will lead all legal, risk management, government affairs, compliance, corporate social responsibility, and insurance functions for the Company. She will also serve as the primary legal advisor to the Builders FirstSource Board of Directors.

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Alena Brenner appointed Executive Vice President, Chief Legal Officer and Corporate Secretary, Builders FirstSource

"Alena's breadth of experience in advising on legal matters related to our industry, litigation and risk management, corporate governance, and the execution of strategic business initiatives will bring significant value to Builders FirstSource," said Jackson. "I am looking forward to the positive influence her leadership will have on our team and those we serve."

Ms. Brenner has nearly 25 years of legal experience in industries including manufacturing, CPG and fleet management. She joins the Company from Cornerstone Building Brands, where she served as EVP, General Counsel and Corporate Secretary beginning in 2021. Prior to that, Ms. Brenner held various legal leadership positions with Ryder System, Inc. including General Counsel of its largest division, Fleet Management Solutions, before advancing to Deputy General Counsel of Ryder. She also previously worked for Anheuser-Busch InBev and Hunton Andrews Kurth LLP in New York.

Ms. Brenner earned her juris doctor from New York's Fordham School of Law and has been admitted to the bar in New Jersey and New York. She also holds a bachelor's degree in industrial and labor relations from Cornell University.

About Builders FirstSource

Builders FirstSource (NYSE:BLDR), headquartered in Irving, Texas, is the nation's leading provider of building materials for professional builders in new residential construction and repair and remodeling. We deliver integrated homebuilding solutions by manufacturing, supplying, and installing a full range of structural and related building products. With approximately 570 locations across 43 states, we serve 48 of the top 50 and 94 of the top 100 Core Based Statistical Areas (CBSAs), ensuring broad geographic coverage and enhancing our ability to partner with our customers. Our leading network of strategically located manufacturing facilities produces factory-built roof and floor trusses, wall panels, vinyl windows, custom millwork and trim, manufactured and semi-custom modular homes, as well as engineered wood that we design and cut specifically for each home. We also assemble interior and exterior doors into pre-hung units for easy installation. Additionally, we distribute a wide range of building products, including lumber, sheet goods, windows, doors, millwork, and specialty items. Our services, which vary by market, include professional installation, turnkey framing, and shell construction. Supported by the latest construction innovations and digital solutions, we help drive greater efficiency across homebuilding. Learn more at www.bldr.com.

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Investor Contact:

Heather Kos

SVP, Investor Relations

Builders FirstSource, Inc.

investorrelations@BLDR.com

Media Contact:

Lori Conrad

Senior Director, Corporate Communications

Builders FirstSource, Inc.

info.pr@BLDR.com

Alena Brenner Appointed Builders FirstSource Chief Legal Officer