MASTEC, INC.
bd_69df7fd6f827f747 · schema v1 · pii pii-v1
Full breach record for MASTEC, INC. →2 incidents on fileMasTec, Inc. notified Nebraska residents of a data breach where an unauthorized third party accessed a small portion of its network in August 2025. Suspicious activity was detected in October 2025. The incident involved personal information of individuals, including Rhode Island residents (73 identified). MasTec engaged third-party experts, notified law enforcement, and offered complimentary identity-theft monitoring services.
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Incident timeline
Aug 1, 2025
Begins
Oct 1, 2025
Discovered
Jun 5, 2026
Filed
Linked disclosures
Why this link?Ransomware claims (1)
- Leak Sitecl0pbd_077ee15e6166ed792025-10-31 · +216dVerified by operator
Regulatory filings (7) · sorted by filing gap
- Vermont State AGbd_17006039c927389d2026-06-05Verified
- Indiana State AGbd_2337a1feed74d7a42026-06-05Verified
- Maine State AGbd_b14ee6c6db7a57262026-06-05Verified
- South Carolina State AGbd_d93b0d10e9a7baae2026-06-05Verified
Show 3 more filings ↓Show fewer ↑up to 4d gap
- New Hampshire State AGbd_9a55bbe733ae71cb2026-06-04 · +1dCandidate
- Texas State AGbd_2db96186099527c32026-06-09 · +4dVerified
- Massachusetts State AGbd_fa5d678c3d2160372026-06-09 · +4dVerified
Filing propagation · 8 filings · 8 states
View merged incident ↗Pattern: first filing Jun 4 (NH), last Jun 9 (MA) — a 5-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?
Evidence ladder
Attacker assertion only. Establishes: claim date, group, alleged victim.
Unlocks: incident narrative, operational impact. Still no compliance clock.
Unlocks: discovery date, data types, affected count, compliance clock.
Unlocks: materiality, stated response, full audit trail. Ceiling removed.