BreachCensus

MasTec, Inc.

United States of America

MasTec, Inc. is an organisation in Texas. It appears on the Texas Attorney General breach-notification register and the Vermont Attorney General breach-notification register with 3 confirmed incidents; the most recent notice was filed on June 9, 2026.

Data as of September 6, 2026.

Confirmed incident

US-TX

Occurred
August 9, 2025
Disclosed
June 9, 2026
Records affected
25,220

Timeline

  1. June 9, 2026
    Reported to regulator Regulator

    TX AG breach notification: 4,827 Texas residents affected

    source
What a Texas notice means

Required under Tex. Bus. & Com. Code §521.053. Notice to the Attorney General is required when a breach affects at least 250 Texas residents.

Note: the published count is a total, not limited to Texas residents.

Texas breach-notification register ↗

Confirmed incident

US-VT

Disclosed
June 5, 2026

Timeline

  1. June 5, 2026
    Reported to regulator Regulator

    VT AG breach notification: 8 Vermont residents affected

    source
What a Vermont notice means

Required under 9 V.S.A. §2435. Notification to the Attorney General is required.

Note: the count is Vermont residents.

Vermont breach-notification register ↗

Unverified claim

US — Ransomware Attack

This is an unverified claim — it has allegedly happened to this organisation, as posted by a source below, but has not been confirmed by a regulator, a court filing or the organisation’s own disclosure.

Timeline

  1. October 31, 2025
    Claimed by threat actor (unverified) Claim

    Ransomware leak-site claim (ransomware_live)

    source