| MASTEC PIPELINE ARGENTINA, LLCCoral Gables, FL · Active | Coral Gables, FL | LLC | Aug 1, 2025 | Active |
| MASTEC MIDDLE EAST HOLDINGS, LLCCoral Gables, FL · Active | Coral Gables, FL | LLC | Jun 13, 2025 | Active |
| HENKELS & MCCOY WEST, LLCCoral Gables, FL · Active | Coral Gables, FL | LLC | Aug 1, 2022 | Active |
| MCC INVESTMENT AND HOLDINGS, LLCCoral Gables, FL · Active | Coral Gables, FL | LLC | Dec 10, 2020 | Active |
| ENVIRONMENTAL AND DEWATERING SOLUTIONS, LLCCoral Gables, FL · Active | Coral Gables, FL | LLC | Jul 15, 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 |
| PRECISION WEST, LLCCoral Gables, FL · Active | Coral Gables, FL | LLC | Oct 5, 2017 | Active |
| AT POWER, INC.Coral Gables, FL · Active | Coral Gables, FL | Corporation | Sep 14, 2016 | Active |
| PACER CONSTRUCTION CORPORATIONCoral Gables, FL · Active | Coral Gables, FL | Corporation | Oct 27, 2015 | Active |
| MASTEC INDUSTRIAL CORP.Coral Gables, FL · Active | Coral Gables, FL | Corporation | Jul 21, 2015 | Active |
| MASTEC FFH, INC.Coral Gables, FL · Active | Coral Gables, FL | Corporation | Oct 28, 2014 | Active |
| CCM INVESTMENT HOLDING CO.Coral Gables, FL · Active | Coral Gables, FL | Corporation | Nov 5, 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 |
| LEMARTEC CORPORATIONCoconut Grove, FL · Active | Coconut Grove, FL | Corporation | Mar 20, 1979 | Active |
| HENKELS & MCCOY, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Feb 6, 1959 | Active |
| DATA CELL SYSTEMS, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Sep 30, 2002 | Inactive |
| WANZEK CONSTRUCTION, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Nov 3, 2004 | Active |
| CAM COMMUNICATIONS OF MARYLAND, INC.Coral Gables, FL · Inactive | Coral Gables, FL | Corporation | Nov 2, 2011 | Inactive |
| OPTIMA NETWORK SERVICES, INC.Coral Gables, FL · Inactive | Coral Gables, FL | Corporation | Aug 15, 2012 | Inactive |
| DYNAMIC TOWER SERVICES, INC.Coral Gables, FL · Inactive | Coral Gables, FL | Corporation | Jun 16, 2015 | Inactive |
| HMI SERVICES, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | May 16, 2016 | Active |
| H&M SHARED SERVICES, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Feb 17, 2021 | Active |
| WESTOWER COMMUNICATIONS INC.Orlando, FL · Inactive | Orlando, FL | Corporation | Sep 13, 1999 | Inactive |
| PRECISION PIPELINE SERVICES, LLCCoral Gables, FL · Inactive | Coral Gables, FL | LLC | Mar 28, 2018 | Inactive |
| PRECISION DEWATERING, LLCLocation not reported, FL · Active | Location not reported, FL | LLC | Mar 28, 2018 | Active |
| MASTEC INTERNATIONAL, LLCCoral Gables, FL · Active | Coral Gables, FL | LLC | Dec 19, 2023 | Active |
| CHURCH & TOWER, INC.Coral Gables, FL · Active | Coral Gables, FL | Corporation | Aug 22, 1990 | Active |
| PRECISION PIPELINE LLCLocation not reported, FL · Active | Location not reported, FL | LLC | Jan 8, 2009 | Active |
| AMERICAN CIVIL CONSTRUCTORS LLCLocation not reported, FL · Active | Location not reported, FL | LLC | Jan 22, 2016 | Active |
| MASTEC PROFESSIONAL SERVICES, LLCLocation not reported, FL · Active | Location not reported, FL | LLC | Apr 1, 2016 | Active |
| HMI UTILITIES, LLCLocation not reported, FL · Inactive | Location not reported, FL | LLC | Apr 19, 2018 | Inactive |
| IEA EQUIPMENT MANAGEMENT, LLCLocation not reported, FL · Active | Location not reported, FL | LLC | Feb 12, 2019 | Active |
| WHITE CONSTRUCTION OF INDIANA, LLCLocation not reported, FL · Active | Location not reported, FL | LLC | Feb 18, 2019 | Active |
| IEA CONSTRUCTORS, LLCLocation not reported, FL · Active | Location not reported, FL | LLC | Mar 11, 2019 | Active |
| NEW STOUT EXCAVATING GROUP TEXAS, LLCLocation not reported, FL · Active | Location not reported, FL | LLC | Mar 1, 2023 | Active |
| ECS ACQUISITION MERGER SUBSIDIARY I, INC.Coral Gables, FL · Inactive | Coral Gables, FL | Corporation | Jul 13, 2010 | Inactive |
| DOUGLAS FIBER ENTERPRISES, INC.Coral Gables, FL · Inactive | Coral Gables, FL | Corporation | Jun 11, 2013 | Inactive |
| MASTEC EQUIPMENT, INC.Coral Gables, FL · Inactive | Coral Gables, FL | Corporation | Oct 17, 2017 | 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 NORTH AMERICA, INC.Coral Gables, FL · Active | Coral Gables, FL | Corporation | Apr 15, 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 |