{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-25-143135","form_type":"8-K/A","ticker":"NUE","cik":"0000073309","company_name":"NUCOR CORP","filed_at":"2025-06-20T23:59:59+00:00","discovered_at":"2026-05-14T18:02:51.130513+00:00","generated_at":"2026-05-19T02:09:51.925888+00:00","sec_items":["1.05"],"event_type":"cyber","sentiment":"negative","materiality_score":0.45,"calibrated_materiality_score":0.45,"confidence":"high","headline":"Nucor updates on May 2025 cyber incident; operations restored, no material impact","bullets":["Threat actor illegally accessed IT systems; limited data exfiltrated; access temporarily restricted to some applications.","Production at various facilities proactively halted as precaution; operations since restored.","Company believes incident not material to business, financial condition, or results; no material impact expected.","Remediation included incident response activation, system shutdown, backup restoration, external experts, and law enforcement notification."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-25-143135","json":"https://secwatch.observer/filing/0001193125-25-143135.json","markdown":"https://secwatch.observer/filing/0001193125-25-143135.md","text":"https://secwatch.observer/filing/0001193125-25-143135.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/73309/000119312525143135/0001193125-25-143135-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/73309/000119312525143135/d926586d8ka.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-19T02:09:51.925888+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":"b57c7be5cbb828c696855f5eefbeb2d575389a4b","claim":"NUCOR CORP disclosed a cybersecurity incident: A threat actor illegally accessed the Company's information technology systems, exfiltrated limited data, and caused temporary limitations to access of applications supporting some operations. Impact: The incident has not had and is not reasonably likely to have a material impact on business operations, financial condition, or results of operations. Company determined it not material.","evidence_excerpt":"The cybersecurity incident has not had a material impact, and is not reasonably likely to have a material impact, on the Company’s business operations, and has not had a material impact, and is not reasonably likely to have a material impact, on the Company’s financial condition or results of operations.","evidence_source":"SEC 8-K Item 1.05","evidence_url":"https://www.sec.gov/Archives/edgar/data/73309/000119312525143135/0001193125-25-143135-index.htm","confidence":0.9,"family_label":"Cybersecurity Incidents","details":[{"label":"Nature","value":"A threat actor illegally accessed the Company's information technology systems, exfiltrated limited data, and caused temporary limitations to access of applications supporting some operations"},{"label":"Impact","value":"The incident has not had and is not reasonably likely to have a material impact on business operations, financial condition, or results of operations"},{"label":"Materiality","value":"not material"}],"fact_type":"cyber_incident"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}