Where does the MasTec case file come from?

Every entry is taken from the breach report MasTec lodged with the South Carolina Attorney General. Nothing here is estimated.

Why do the incident date and the report date differ?

Companies usually investigate before they report. The gap between the two dates shows how long that took.

What does the records-affected figure count?

It is the number the company gave the state. It can cover residents of that state only, so the national total may be higher.

Does this case file change over time?

Yes. When a company files an update or a new state publishes its copy of the report, the dates and counts here are refreshed.

Case file

Case File: MasTec Data Breach

This file collects the dated facts on record for the MasTec incident. The state report is dated June 5, 2026.

Timeline

June 5, 2026Report filed in South CarolinaDate the notice was lodged with the South Carolina Attorney General.

Case facts

Filing state: South Carolina
Date reported: June 5, 2026
Receiving office: South Carolina Attorney General

Case notes

MasTec, a global infrastructure engineering and construction firm, recently filed a report concerning a data security incident. This official notification, dated June 5, 2026, indicates that the company is actively engaged in an investigation to understand the full scope and nature of the event.

According to available public filings, the specific type of breach that occurred has not been detailed, nor have the categories of personal information potentially affected. The report does not specify how unauthorized access may have taken place or which systems were compromised in this security event.

Furthermore, the public documentation does not provide a figure for the number of individuals whose data may have been involved. This means the complete extent of the potential impact on customers, employees, or other associated parties remains undisclosed based on current regulatory filings.

Individuals who have or have had a relationship with MasTec are advised to remain vigilant regarding their personal accounts. General security best practices include regularly reviewing financial statements and other personal accounts for any unusual activity. It is also prudent to exercise caution when receiving unsolicited communications, particularly those requesting personal data.

This information is compiled from public regulatory filings and reflects the currently documented status of the MasTec data security incident. As the investigation continues, additional details may emerge through subsequent disclosures.

Questions about this case file

Where does the MasTec case file come from?: Every entry is taken from the breach report MasTec lodged with the South Carolina Attorney General. Nothing here is estimated.
Why do the incident date and the report date differ?: Companies usually investigate before they report. The gap between the two dates shows how long that took.
What does the records-affected figure count?: It is the number the company gave the state. It can cover residents of that state only, so the national total may be higher.
Does this case file change over time?: Yes. When a company files an update or a new state publishes its copy of the report, the dates and counts here are refreshed.

South Carolina data breaches

Filing source: South Carolina Attorney General

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Timeline

Case facts

Case notes

Questions about this case file

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