| GLOBAL TRENCHERS, LLCCoral Gables, FL · Active | Coral Gables, FL | LLC | Jun 18, 2025 | Active |
| ALVAH CONTRACTING HOLDCO, LLCCoral Gables, FL · Active | Coral Gables, FL | LLC | Oct 24, 2022 | Active |
| ECS WEST, LLCCoral Gables, FL · Active | Coral Gables, FL | LLC | Aug 10, 2022 | Active |
| INTREN WEST, LLCCoral Gables, FL · Active | Coral Gables, FL | LLC | Aug 1, 2022 | Active |
| UTILITY SERVICES GROUP 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 |
| SOUTHPAW FENCING LLCCoral Gables, FL · Active | Coral Gables, FL | LLC | Jun 4, 2020 | Active |
| MASTEC CIVIL CONSTRUCTORS, LLCCoral Gables, FL · Active | Coral Gables, FL | LLC | Oct 17, 2019 | Active |
| PRETEC DIRECTIONAL DRILLING, LLCCoral Gables, FL · Active | Coral Gables, FL | LLC | Mar 14, 2016 | Active |
| MASTEC TPP, LLCCoral Gables, FL · Active | Coral Gables, FL | LLC | May 6, 2015 | Active |
| MASTEC MEXICO HOLDING COMPANY, LLCCoral Gables, FL · Active | Coral Gables, FL | LLC | Dec 26, 2013 | Active |
| MASTEC ETS SERVICE COMPANY, LLCCoral Gables, FL · Active | Coral Gables, FL | LLC | Aug 28, 2013 | Active |
| MASTEC CIVIL, LLCMedley, FL · Active | Medley, FL | LLC | Dec 10, 2020 | 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 |
| PHOENIX INDUSTRIAL, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Feb 17, 2010 | Active |
| BYERS ENGINEERING COMPANYLocation not reported, FL · Active | Location not reported, FL | Corporation | Dec 13, 1978 | 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 |
| KINGSLEY CONSTRUCTORS, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | May 18, 2021 | Active |
| VOLVO PENTA OF THE AMERICAS, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Feb 3, 1993 | Inactive |
| MASTEC RESIDENTIAL SERVICES, LLCCoral Gables, FL · Inactive | Coral Gables, FL | LLC | Jul 29, 2009 | Inactive |
| PRECISION ENGINEERING SOLUTIONS, LLCLocation not reported, FL · Active | Location not reported, FL | LLC | Apr 6, 2018 | Active |
| RKPE PROPERTIES, LLCLocation not reported, FL · Active | Location not reported, FL | LLC | Oct 26, 2023 | Active |
| MASTEC PHILIPPINES, LLCCoral Gables, FL · Active | Coral Gables, FL | LLC | Jan 16, 2024 | 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 |
| EC SOURCE SERVICES, LLCLocation not reported, FL · Inactive | Location not reported, FL | LLC | Feb 16, 2009 | Inactive |
| 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 |
| BIANCHI ELECTRIC, LLCLocation not reported, FL · Inactive | Location not reported, FL | LLC | Mar 4, 2019 | Inactive |
| 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 |
| CONDOTTE AMERICA INC.Medley, FL · Inactive | Medley, FL | Corporation | Nov 16, 1987 | Inactive |
| APPLESWAY LANDSCAPING, INC.Jacksonville, FL · Inactive | Jacksonville, FL | Corporation | Feb 21, 2005 | Inactive |
| CASEY INDUSTRIAL, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Aug 16, 1991 | Inactive |
| MASTEC BRAZIL II, INC.Coral Gables, FL · Active | Coral Gables, FL | Corporation | Jan 12, 1999 | Active |