FEDERALItem 1.05 · mandatoryUnauthorized AccessManufacturingManufacturingIron & SteelLowActive
NUCOR CORPORATION
bd_e268d2c41e8bb27d · schema v1 · pii pii-v1
Full breach record for NUCOR CORPORATION →Nucor Corporation, a Delaware-incorporated steel manufacturer, disclosed under SEC Item 1.05 a cybersecurity incident involving unauthorized third-party access to certain IT systems. Upon detection, Nucor activated its incident response plan, took potentially affected systems offline, halted certain production operations at various locations, engaged external cybersecurity experts, and notified federal law enforcement. The investigation is ongoing; operations are being restarted. Scope, threat actor, data impact, and individuals affected were not disclosed.
SEC clockMateriality determined May 13, 2025 → Filed May 14, 20251d ✓ SEC 4-day OK
⚠ no discovery dateNo discovery date was extracted, so no notification clock can be evaluated.
Tracked as a single-filing incident — the only disclosure on record for this event so far.ConfirmedView incident
Source provenance
- Source URL
- https://www.sec.gov/Archives/edgar/data/73309/000119312525119311/d795264d8k.htm
DisclosureLens renders the full SEC/HHS filing inline below from the originating regulator’s public record (§4.5 fair report privilege).
- Filed at
- May 14, 2025
- Raw hash
- 7d5cd0480321d6216865c0ca0e699d8ff9661fa7ba5470dae7fd341c419a1e93
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
- Threat actor
- External
- Regulator citations
- Notified federal law enforcement authoritiesFiled Form 8-K Item 1.05 with the SEC
Compliance
- Compliance flags
- SEC 4-day OK · 1d
- 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: May 14, 20251d cal. 4 business days SEC 4-day OK
Extraction provenance
- Status
- No extraction artifact recorded for this disclosure.