FEDERALItem 1.05 · mandatoryHackingManufacturingManufacturingIron & SteelCapture Stored DataData ExfiltratedLowContained
NUCOR CORPORATION
bd_5d4a1347ab3beb1c · schema v1 · pii pii-v1
Full breach record for NUCOR CORPORATION →Nucor Corporation filed an 8-K/A amendment (Item 1.05) on June 20, 2025 supplementing its May 14, 2025 disclosure of a cybersecurity incident. Investigation determined a threat actor illegally accessed Nucor's IT systems and exfiltrated limited data, causing temporary halt of production at some facilities. Affected operations and IT access have been restored; Nucor believes the threat actor no longer has access. Company states the incident has not had and is not reasonably likely to have a material impact on its business or financials.
SEC clockMateriality determined May 13, 2025 → Filed Jun 20, 202538d ✗ SEC 4-day late
⚠ no discovery dateNo discovery date was extracted, so no notification clock can be evaluated.
This filing is one of 5 about the same incident.View merged incident
Linked disclosures
Why this link?Regulatory filings (4) · sorted by filing gap
- bd_e8dd270c8f1b4b65Indiana State AGfiled 2025-06-24(4d gap)Verified
- bd_f0b0185bf1d1823bVermont State AGfiled 2025-06-24(4d gap)Candidate
- bd_9461555a0a074d8aNew Hampshire State AGfiled 2025-06-27(7d gap)Verified
- bd_70306daf12f7c0d8New Hampshire State AGfiled 2025-06-30(10d gap)Verified
Source provenance
- Source URL
- https://www.sec.gov/Archives/edgar/data/73309/000119312525143135/d926586d8ka.htm
DisclosureLens renders the full SEC/HHS filing inline below from the originating regulator’s public record (§4.5 fair report privilege).
- Filed at
- Jun 20, 2025
- Raw hash
- 7c29c588613feeb13701258aec1806212ba1cdadd486f02654bfd9f33106bd6f
Source filing
AI-assisted summary above. The structured extract on this page was generated from the document below. Inspect the source to verify or correct any field.
Reporting entity
- Name
- NUCOR CORPORATIONnorm: nucor
- SEC CIK
- 0000073309
- Domain
- nucor.com
Victim entity
- Name
- NUCOR CORPORATIONnorm: nucor
- SEC CIK
- 0000073309
- Domain
- nucor.com
- Industry
- Steel manufacturing
- Industry
- ManufacturingllmNAICS 331110 · Iron and Steel Mills and Ferroalloy Manufacturing
Incident
- Discovered
- —
- Materiality determined
- May 13, 2025
- Notification sent
- —
- Affected individuals
- Not disclosed
- Data types
- —
- Attack vector
- Unauthorized Access
- MITRE ATT&CK
- T1041 Exfiltration Over C2 Channel
- Threat actor
- External
- Regulator citations
- Notified federal law enforcement authorities
Compliance
- Compliance flags
- SEC 4-day late · 38d
- Discovery-date grounding
- no discovery dateNo discovery date was extracted, so no notification clock can be evaluated.
- Clock breakdown
Statute Window Elapsed Threshold Status SEC Materiality determined: May 13, 2025→ Filed: Jun 20, 202538d cal. 4 business days SEC 4-day late
Extraction provenance
- Status
- No extraction artifact recorded for this disclosure.