MasTec, Inc. is a leading North American infrastructure engineering and construction company based in Coral Gables, Florida. The company specializes in the engineering, building, installation, maintenance, and upgrade of communications, energy, and utility infrastructure. Its primary customers include major providers in the telecommunications, utility, renewable energy, and government sectors.
For the year ended December 31, 2025, AT&T represented approximately 10% of MasTec's total consolidated revenue (concentrated primarily within the Communications segment), and the company's top ten customers accounted for approximately 34% of revenue (35% in 2024 and 38% in 2023). No other single customer exceeded 10% of total consolidated revenue, and MasTec served approximately 1,800 customers in 2025.