Builders FirstSource, Inc. (BLDR) · Insider Trading (Form 4) SEC Filing

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-05-14 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: Builders FirstSource, Inc. (BLDR) CIK: 0001316835 --- Reporting Owner --- Name: LEVY PAUL S CIK: 0001110176 Role: Director --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock, par value $0.01 per share Date: 2026-05-14 | Code: A (Grant or award) Shares: +2,558 | Price: $0.00 Shares Owned After: 1,729,749 | Ownership: D (Direct) Footnotes: [F1] Reflects the acquisition of restricted stock units pursuant to the Corporation's 2014 Incentive Plan. The restricted stock units vest on May 14, 2027 and entitle the reporting person to one share of common stock for each restricted stock unit that vests. --- Footnotes (Complete Index) --- F1: Reflects the acquisition of restricted stock units pursuant to the Corporation's 2014 Incentive Plan. The restricted stock units vest on May 14, 2027 and entitle the reporting person to one share of common stock for each restricted stock unit that vests. --- Signature --- /s/ /s/ Minator Azemi, by power of attorney (2026-05-18)