Incident disclosureDisclosed 2025-05-14Nucor CorpSEC filing

Nucor Corp discloses a cybersecurity incident (SEC 8-K, May 2025)

Nucor Corporation (the “Company”) recently identified a cybersecurity incident involving unauthorized third party access to certain information technology systems used by the Company.

What happened

Upon detecting the incident, the Company began promptly taking steps to contain and respond to the incident, including activating its incident response plan, proactively taking potentially affected systems offline and implementing other containment, remediation, or recovery measures.Form 8-K Item 1.05, Nucor Corp, filed 2025-05-14

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Source

Nucor Corp, Form 8-K (Item 1.05), filed 2025-05-14

U.S. SEC EDGAR, Form 8-K Item 1.05 · SEC Form 8-K, Item 1.05 (Material Cybersecurity Incidents)

Read the original source

Ingested automatically from the company’s SEC filing. Facts are quoted from the filing; the failure-pattern classification is rule-based and unreviewed.

How far to trust this record

Evidence type: Incident disclosure
Review status: Not yet human-reviewed
Record ID: SEA-8K-0001193125-25-119311

A company’s own SEC filing about a cybersecurity incident (Form 8-K, Item 1.05), ingested automatically. Facts are quoted from the filing; the classification is machine-extracted.

Cite this record

CollectSEA. (2026). Nucor Corp discloses a cybersecurity incident (SEC 8-K, May 2025) [Incident record SEA-8K-0001193125-25-119311]. https://collectsea.com/incidents/SEA-8K-0001193125-25-119311

Please cite the original source for any factual claim.