---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-259521"
form_type: "8-K"
ticker: "BLDR"
cik: "0001316835"
company_name: "Builders FirstSource, Inc."
filed_at: "2026-06-05T20:05:16+00:00"
generated_at: "2026-06-05T20:06:31.982933+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.4
calibrated_materiality_score: 0.4
confidence: "high"
source: SEC EDGAR
---

# Builders FirstSource director Mark Alexander resigns for health reasons

## Summary
- Mark A. Alexander resigned from the Board of Directors on June 3, 2026.
- Resignation due to health reasons; no disagreement with company operations.
- Effective immediately; no replacement announced.
- Company thanked Mr. Alexander for his counsel and contributions.

## SEC filing metadata
- accession: 0001193125-26-259521
- form_type: 8-K
- ticker: BLDR
- cik: 0001316835
- company_name: Builders FirstSource, Inc.
- filed_at: 2026-06-05T20:05:16+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.4
- calibrated_materiality_score: 0.4
- confidence: high
- sec_items: 5.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1316835/000119312526259521/0001193125-26-259521-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1316835/000119312526259521/bldr-20260603.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-259521
- JSON: https://secwatch.observer/filing/0001193125-26-259521.json
- Plain text: https://secwatch.observer/filing/0001193125-26-259521.txt

## Key facts
- Executive change
  Mark A. Alexander resigned as Director at Builders FirstSource, Inc..
  - Action: resigned
  - Role: Director
  source text: On June 3, 2026, Mark A. Alexander notified the Board of Directors (the "Board") of Builders FirstSource, Inc. (the "Company") of his resignation from the Board, effective immediately, due to health reasons.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1316835/000119312526259521/0001193125-26-259521-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.