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: 2026-06-01 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: Builders FirstSource, Inc. (BLDR) CIK: 0001316835 --- Reporting Owner --- Name: Hayes William B CIK: 0001320940 Role: Director --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock, par value $0.01 per share Date: 2026-06-01 | Code: A (Grant or award) Shares: +508 | Price: $76.26 Total Value: $38,740.08 Shares Owned After: 19,638 | Ownership: D (Direct) Footnotes: [F1] Reflects acquisition of shares in lieu of cash compensation for services as a director under the Corporation's 2026 Incentive Plan pursuant to the Corporation's Amended and Restated Director Compensation Policy. --- Holdings --- [Holding #1] Security: Common Stock, par value $0.01 per share Ownership: I (Indirect) --- Footnotes (Complete Index) --- F1: Reflects acquisition of shares in lieu of cash compensation for services as a director under the Corporation's 2026 Incentive Plan pursuant to the Corporation's Amended and Restated Director Compensation Policy. --- Signature --- /s/ /s/ Minator Azemi, by power of attorney (2026-06-02)