{"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","discovered_at":"2026-06-05T20:06:00.386553+00:00","generated_at":"2026-06-05T20:06:31.982933+00:00","sec_items":["5.02"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.4,"calibrated_materiality_score":0.4,"confidence":"high","headline":"Builders FirstSource director Mark Alexander resigns for health reasons","bullets":["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."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-26-259521","json":"https://secwatch.observer/filing/0001193125-26-259521.json","markdown":"https://secwatch.observer/filing/0001193125-26-259521.md","text":"https://secwatch.observer/filing/0001193125-26-259521.txt","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"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-05T20:06:31.982933+00:00"},"review":{"review_status":"machine_generated","human_reviewed":false,"corrected":false,"correction_note":null,"correction_timestamp":null,"superseded_by":null,"related_filings":[]},"source_grounded_claims":[{"claim_id":"8bb2655f20","claim":"Mark A. Alexander resigned as Director at Builders FirstSource, Inc..","evidence_excerpt":"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_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1316835/000119312526259521/0001193125-26-259521-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"resigned"},{"label":"Role","value":"Director"}],"fact_type":"executive_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}