MASTEC, INC.

MasTec, Inc. based in Coral Gables, Florida, a other entity reported a data breach to the Texas Attorney General. The breach was discovered on 2026-04-23 and reported on 2026-06-09. 4,827 Texas residents were affected. 25,220 individuals affected in total. Types of information involved: Name of individual;Address;Social Security Number Information;Financial Information (e.g. account number, credit or debit card number);Date of Birth. Consumers were notified via U.S. Mail.

MasTec, Inc. disclosed a data breach in Massachusetts (filing 2026-932) affecting at least 73 Rhode Island residents, with notifications sent to individuals in multiple states. The incident occurred in August 2025, involving unauthorized access to a portion of the network. Personal information was accessed, and MasTec offered credit monitoring services.

MasTec, Inc. reported a data breach to the Vermont Attorney General. The breach was reported to the AGO on 2026-06-05. The reporting organization type is Other Commercial. 8 Vermont residents were affected. Categories of data breached: Social Security Numbers, Financial Account Codes, Credit and Debit Account Info.

MasTec Inc reported a data breach to the Indiana Attorney General. The breach occurred on 2025-08-09 and was reported on 2026-06-05. 54 Indiana residents were affected. 25,220 individuals affected in total.

MasTec, 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.

MasTec, Inc. reported an external system breach (hacking) occurring on August 9, 2025, discovered on April 23, 2026. The incident affected 25,220 individuals, including 11 Maine residents. Notification was sent on June 5, 2026, offering identity theft protection services via CyEx Financial Shield. The breach involved unauthorized access to external systems.

MasTec, Inc. reported a data security event in South Carolina involving unauthorized access to a portion of its computer network in August 2025. The breach affected personal information of individuals, including 73 Rhode Island residents. MasTec engaged third-party cybersecurity experts and law enforcement, and is offering complimentary credit and identity-theft monitoring services to affected individuals.

MasTec, Inc. notified the New Hampshire Attorney General of a security event affecting 18 NH residents (and 73 RI residents) involving unauthorized access via a zero-day vulnerability in a third-party solution. The incident occurred in August 2025, was detected in October 2025, and involved the exfiltration of names, SSNs, financial account details, and credentials. MasTec applied patches, engaged forensic experts, and mailed notices on June 5, 2026, offering credit monitoring.

MasTec, Inc. is a leading American infrastructure construction firm. Founded in 1929 and currently headquartered in Coral Gables, Florida, MasTec delivers a range of services across different industries including electricity, oil and gas, technology, and telecommunications. Its wide array of services include engineering, building, installation, maintenance, upgrade of energy, utility, and communications infrastructure.

MasTec Care Opt Plus Plan notifies Montana residents that Delta Dental Plans Association, a third-party administrator, experienced a security incident involving the MOVEit file transfer application. Unauthorized actors downloaded data between May 27-30, 2023. Data included names, SSNs, DOBs, and contact info. MasTec discovered the incident on July 21, 2023, and sent notifications on October 27, 2023. Credit monitoring is offered.