| FRIENDS OF ARMENIAN LACROSSE, INC.Cooper City, FL · Active | Cooper City, FL | Nonprofit | Jun 23, 2025 | Active |
| INTREN WEST, LLCCoral Gables, FL · Active | Coral Gables, FL | LLC | Aug 1, 2022 | Active |
| MASTEC UTILITY SERVICES, LLCCoral Gables, FL · Active | Coral Gables, FL | LLC | Jul 15, 2021 | Active |
| SUPPORT OPERATIONS SERVICES, LLCCoral Gables, FL · Active | Coral Gables, FL | LLC | Jun 7, 2021 | Active |
| MASTEC INFRASTRUCTURE HOLDINGS, LLCCoral Gables, FL · Active | Coral Gables, FL | LLC | Feb 10, 2021 | Active |
| SOUTHPAW FENCING LLCCoral Gables, FL · Active | Coral Gables, FL | LLC | Jun 4, 2020 | Active |
| PRECISION INFRASTRUCTURE, LLCCoral Gables, FL · Active | Coral Gables, FL | LLC | Apr 2, 2018 | Active |
| PRECISION FABRICATION SERVICES, LLCCoral Gables, FL · Active | Coral Gables, FL | LLC | Mar 28, 2018 | Active |
| AT POWER, INC.Coral Gables, FL · Active | Coral Gables, FL | Corporation | Sep 14, 2016 | Active |
| MASTEC INDUSTRIAL CORP.Coral Gables, FL · Active | Coral Gables, FL | Corporation | Jul 21, 2015 | Active |
| MASTEC TPP, LLCCoral Gables, FL · Active | Coral Gables, FL | LLC | May 6, 2015 | Active |
| MASTEC FFH, INC.Coral Gables, FL · Active | Coral Gables, FL | Corporation | Oct 28, 2014 | Active |
| MASTEC ETS SERVICE COMPANY, LLCCoral Gables, FL · Active | Coral Gables, FL | LLC | Aug 28, 2013 | Active |
| THREE PHASE LINE CONSTRUCTION, INC.Coral Gables, FL · Active | Coral Gables, FL | Corporation | Jan 18, 2012 | Active |
| MASTEC NETWORK SOLUTIONS, INC.Coral Gables, FL · Active | Coral Gables, FL | Corporation | Sep 8, 2011 | Active |
| POWER PARTNERS MASTEC, INC.Coral Gables, FL · Active | Coral Gables, FL | Corporation | Sep 17, 2010 | Active |
| MASTEC RENEWABLES CONSTRUCTION COMPANY, INC.Coral Gables, FL · Active | Coral Gables, FL | Corporation | Jul 1, 2010 | Active |
| T&D POWER, INC.Coral Gables, FL · Active | Coral Gables, FL | Corporation | Mar 18, 2010 | Active |
| ENERGY ERECTORS, INC.Leesburg, FL · Active | Leesburg, FL | Corporation | Feb 12, 2001 | Active |
| NV2A CONSTRUCTION, LLCMiami, FL · Active | Miami, FL | LLC | May 25, 2016 | Active |
| NV2A GROUP, LLCMiami, FL · Active | Miami, FL | LLC | May 25, 2016 | Active |
| NV2A INFRASTRUCTURE, LLCMiami, FL · Active | Miami, FL | LLC | May 25, 2016 | Active |
| HENKELS & MCCOY, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Feb 6, 1959 | Active |
| BYERS ENGINEERING COMPANYLocation not reported, FL · Active | Location not reported, FL | Corporation | Dec 13, 1978 | Active |
| WANZEK CONSTRUCTION, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Nov 3, 2004 | Active |
| HMI SERVICES, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | May 16, 2016 | Active |
| DECISIVE COMMUNICATIONS, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | May 25, 2016 | Active |
| CASH CIVIL CONSTRUCTION, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Mar 18, 2019 | Active |
| QUADGEN WIRELESS SOLUTIONS INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Oct 8, 2019 | Active |
| H&M SHARED SERVICES, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Feb 17, 2021 | Active |
| KINGSLEY CONSTRUCTORS, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | May 18, 2021 | Active |
| EC SOURCE SERVICES, LLCLocation not reported, FL · Active | Location not reported, FL | LLC | Jul 13, 2010 | Active |
| BIG COUNTRY FLORIDA, LLCCoral Gables, FL · Inactive | Coral Gables, FL | LLC | Dec 21, 2016 | Inactive |
| PRECISION DEWATERING, LLCLocation not reported, FL · Active | Location not reported, FL | LLC | Mar 28, 2018 | Active |
| PRECISION SHARED SERVICES, LLCCoral Gables, FL · Active | Coral Gables, FL | LLC | Sep 8, 2026 | Active |
| PUMPCO SHARED SERVICES, LLCCoral Gables, FL · Active | Coral Gables, FL | LLC | Sep 8, 2026 | Active |
| CHURCH & TOWER, INC.Coral Gables, FL · Active | Coral Gables, FL | Corporation | Aug 22, 1990 | Active |
| SAIIA CONSTRUCTION COMPANY OF DE, LLCLocation not reported, FL · Active | Location not reported, FL | LLC | May 10, 2010 | Active |
| HANGING H COMPANIES, LLCLocation not reported, FL · Active | Location not reported, FL | LLC | Aug 14, 2017 | Active |
| IEA EQUIPMENT MANAGEMENT, LLCLocation not reported, FL · Active | Location not reported, FL | LLC | Feb 12, 2019 | Active |
| INTREN, LLCLocation not reported, FL · Active | Location not reported, FL | LLC | Jun 29, 2021 | Active |
| MASTEC WEST, LLCCoral Gables, FL · Inactive | Coral Gables, FL | LLC | Sep 12, 2023 | Inactive |
| MASTEC EQUIPMENT, INC.Coral Gables, FL · Inactive | Coral Gables, FL | Corporation | Oct 17, 2017 | Inactive |
| CASEY INDUSTRIAL, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Aug 16, 1991 | Inactive |
| MASTEC SERVICES COMPANY, INC.Coral Gables, FL · Active | Coral Gables, FL | Corporation | Oct 13, 1997 | Active |
| MASTEC, INC.Coral Gables, FL · Active | Coral Gables, FL | Corporation | Apr 8, 1998 | Active |
| MASTEC VENEZUELA, INC.Coral Gables, FL · Active | Coral Gables, FL | Corporation | Jan 5, 1999 | Active |
| MASTEC SPAIN, INC.Coral Gables, FL · Active | Coral Gables, FL | Corporation | Jan 5, 1999 | Active |
| MASTEC BRAZIL I, INC.Coral Gables, FL · Active | Coral Gables, FL | Corporation | Jan 11, 1999 | Active |
| MASTEC BRAZIL II, INC.Coral Gables, FL · Active | Coral Gables, FL | Corporation | Jan 12, 1999 | Active |