HackingManufacturingManufacturingStolen CredentialsCustomer Data InvolvedData ExfiltratedGovernment IDFinancial accountIdentity (basic)MediumContained

NUCOR CORPORATION

bd_70306daf12f7c0d8 · schema v1 · pii pii-v1

Severity

Medium

Discovered

May 13, 2025

Filed

Jun 30, 2025

To disclose

7 weeks

Affected

1state residents only

Linked

6 filings

Confidence

65%

Full breach record for NUCOR CORPORATION →4 incidents on file

Nucor Corporation reported unauthorized access to IT systems affecting one New Hampshire resident. The incident occurred between May 3 and May 13, 2025, and was detected on May 13, 2025. Data accessed included SSN, corporate credit card number, and DOB. Nucor engaged third-party cybersecurity specialists, notified law enforcement, and provided 24 months of credit monitoring. Additional technical safeguards were implemented.

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Incident timeline

undetected · 10 days

discovery → filing · 7 weeks / 48 days

May 3, 2025

Begins

May 13, 2025

Discovered

Jun 16, 2025

Scope determined

Jun 30, 2025

Filed

This filing is one of 6 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (5) · sorted by filing gap

Massachusetts State AGbd_602a58f53ef5e6fe2025-06-27 · +3dVerified
New Hampshire State AGbd_9461555a0a074d8a2025-06-27 · +3dVerified
Indiana State AGbd_e8dd270c8f1b4b652025-06-24 · +6dVerified
Vermont State AGbd_f0b0185bf1d1823b2025-06-24 · +6dCandidate

Show 1 more filing ↓up to 10d gap

SEC 8-Kbd_5d4a1347ab3beb1c2025-06-20 · +10dVerified

Name: NUCOR CORPORATION
norm: nucor
Domain: nucor.com

Name: NUCOR CORPORATION
norm: nucor
Domain: nucor.com
Industry: Manufacturingllm

Discovered: May 13, 2025
Breach occurred: May 3, 2025 – May 13, 2025
Undetected for: 10 daysoccurrence → discovery
Materiality determined: Jun 16, 2025
Notification sent: Jun 24, 2025
Affected individuals: 1state-resident count only
Data types: Government IDFinancial accountIdentity (basic)
Data elements: Date of birth
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1119 Automated Collection
Threat actor: ExternalFinancial
Regulator citations: Notified Office of the Attorney General, New Hampshire
Initial access: valid_credentials

During the incident: Commenced an investigation with the assistance of third-party cybersecurity specialists
Reported the matter to law enforcement
Offering the impacted New Hampshire resident twenty-four (24) months of free credit monitoring and identity theft prevention services
Changes made: Implemented additional technical safeguards to further secure our systems
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 7 weeks(48 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 6 filings · 4 states

View merged incident ↗

SEC 8-KJun 20 · first

Indiana State AG+4d

Vermont State AG+4d

Massachusetts State AG+7d

New Hampshire State AG+7d

New Hampshire State AG+10d · this page

Pattern: first filing Jun 20, last Jun 30 (NH) — a 10-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://mm.nh.gov/files/uploads/doj/remote-docs/nucor-corporation-20250630.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 30, 2025
Raw hash: 2f666c5f7957d00296c8cc48f0c49cac82c3f6e1a14d531a3cc669060666147a

Linked disclosures

Regulatory filings (5) · sorted by filing gap

Reporting entityNUCOR CORPORATION

Victim entityNUCOR CORPORATION

Incidentdiscovered May 13, 2025

Stated responseCommenced an investigation with the assistance of third-party cybersecurity specialists

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov