Exhibit 99.1 Contact: 800 S. Douglas Road, 12th Floor J. Marc Lewis, Vice President-Investor Relations Coral Gables, Florida 33134 305-406-1815 Tel: 305-599-1800 marc.lewis@mastec.com www.mastec.com For Immediate Release MasTec Announces First Quarter 2024 Financial Results and Raises Guidance for the Year • Record First Quarter 2024 Revenue of $2.7 Billion • First Quarter 2024 GAAP Net Loss of$34.5 Million, a $46.0 Million Improvement over First Quarter 2023 and Beating Consensus Estimates by$33.1 Millio ...