{"schema_version":"secwatch.filing_event.v1","accession":"0001104659-21-143469","form_type":"8-K","ticker":"STLD","cik":"0001022671","company_name":"STEEL DYNAMICS INC","filed_at":"2021-11-24T23:59:59+00:00","discovered_at":"2026-05-14T18:04:11.137244+00:00","generated_at":"2026-06-28T05:23:54.900079+00:00","sec_items":["5.02","8.01","9.01"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.25,"calibrated_materiality_score":0.25,"confidence":"high","headline":"Steel Dynamics appoints Luis M. Sierra as new independent director","bullets":["Appointed effective November 18, 2021; term ends May 2022.","Sierra is President and CEO of NOVA Chemicals, a $3.2B revenue private chemicals firm.","Previously held senior roles at BP, including CEO of BP Global Aromatics.","Sierra will serve on the Steel Dynamics Compensation Committee.","Holds B.S. and M.S. in Mechanical Engineering and an MBA."],"urls":{"canonical":"https://secwatch.observer/filing/0001104659-21-143469","json":"https://secwatch.observer/filing/0001104659-21-143469.json","markdown":"https://secwatch.observer/filing/0001104659-21-143469.md","text":"https://secwatch.observer/filing/0001104659-21-143469.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1022671/000110465921143469/0001104659-21-143469-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1022671/000110465921143469/tm2130607d3_8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-28T05:23:54.900079+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":"3d53f51ce4","claim":"Luis M. Sierra was appointed as Director at STEEL DYNAMICS INC.","evidence_excerpt":"On November 18, 2021, the Board of Directors of Steel Dynamics, Inc. appointed Luis M. Sierra, age 58, as a new director.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1022671/000110465921143469/0001104659-21-143469-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"appointed"},{"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"}