In early October 2025, MasTec, Inc. detected suspicious activity within a portion of its computer network. Following an investigation with third-party cybersecurity experts, MasTec determined that an unauthorized third party had gained access to part of its network for several days in August 2025.
After identifying the affected systems, MasTec conducted a detailed review of impacted files, receiving results in early February 2026. The company then worked to notify individuals whose information may have been included.
MasTec began issuing notification letters in May 2026 and offered affected individuals complimentary credit monitoring and identity theft protection services through Financial Shield.
MasTec, Inc. is a leading American infrastructure engineering and construction company headquartered in Coral Gables, Florida. Founded in 1929, the firm specializes in the engineering, building, installation, maintenance, and upgrade of complex infrastructure across North America, focusing on the communications, energy, and utility sectors.
The impacted data may relate to individuals whose personal information was contained in the files accessed during the unauthorized intrusion.
Following the breach, MasTec reported that it took steps to secure its systems, engaged cybersecurity experts, and notified law enforcement to address the incident and prevent recurrence.
If you received a Data Breach notification letter from MasTec, it confirms that your personal information may have been accessed by an unauthorized actor during this incident.
What information is involved in the MasTec Data Breach?
Compromised information may include:
First Name
Last Name
Social Security Number (if included in affected files)
Financial or Employment-related Information
Other Personally Identifiable Information (PII)
Your Personally Identifiable Information (PII) includes sensitive data that can be used to identify you and may be exploited for fraud. Companies handling such information are legally required to protect it.
When personal information is exposed, it can create risks of identity theft, financial fraud, and unauthorized account activity.
If your data has been exposed, you should monitor your financial accounts, review your credit reports, and consider placing a fraud alert or credit freeze.
If you received a NOTICE OF DATA BREACH from MasTec, your personal information may be at risk.
Contact the Data Breach Attorneys at Emery | Reddy today for a Free Case Review.