| CHURCH & TOWER, INC. (L95201) | COO |
| DOUGLAS FIBER ENTERPRISES, INC. (P13000050682) | Pres |
| DYNAMIC TOWER SERVICES, INC. (F15000002611) | DP |
| ECS ACQUISITION MERGER SUBSIDIARY I, INC. (P10000057291) | PD |
| ENERGY ERECTORS, INC. (P01000016220) | Pres |
| H&M SHARED SERVICES, INC. (F21000000961) | Pres |
| HMI UTILITIES, LLC (M18000003851) | Mana |
| IEA CONSTRUCTORS, LLC (M19000002361) | Chai |
| LEMARTEC CORPORATION (613580) | VP, |
| MASTEC BRAZIL I, INC. (P99000003070) | COO |
| MASTEC EQUIPMENT, INC. (P17000083911) | Pres |
| MASTEC, INC. (P98000032690) | COO |
| POWER PARTNERS MASTEC, INC. (P10000076410) | Pres |
| WESTOWER COMMUNICATIONS INC. (F99000004710) | Pres |
| AT POWER, INC. (F16000004083) | Pres |
| CAM COMMUNICATIONS OF MARYLAND, INC. (F11000004412) | Pres |
| CCM INVESTMENT HOLDING CO. (P13000090262) | Pres |
| HENKELS & MCCOY, INC. (813382) | Pres |
| MASTEC MIDDLE EAST HOLDINGS, LLC (L25000265783) | MGR |
| MASTEC NETWORK SOLUTIONS, INC. (P11000080122) | Pres |
| MASTEC NORTH AMERICA, INC. (P98000034383) | COO |
| MASTEC PROFESSIONAL SERVICES, LLC (M16000002732) | Mana |
| MCC INVESTMENT AND HOLDINGS, LLC (L20000385603) | Exec |
| PACER CONSTRUCTION CORPORATION (P15000088442) | Pres |
| WANZEK CONSTRUCTION, INC. (F04000006322) | Pres |
| EC SOURCE SERVICES, LLC (L10000073795) | Mana |
| MASTEC INDUSTRIAL CORP. (P15000062085) | VP, |
| PRECISION DEWATERING, LLC (L18000079034) | MGR, |
| PRECISION PIPELINE SERVICES, LLC (L18000078994) | MGR |
| THREE PHASE LINE CONSTRUCTION, INC. (F12000000235) | Pres |
| HENKELS & MCCOY WEST, LLC (L22000338866) | Pres |
| MASTEC FFH, INC. (P14000088436) | Pres |
| MASTEC RENEWABLES CONSTRUCTION COMPANY, INC. (P10000055215) | VP, |
| MASTEC VENEZUELA, INC. (P99000000936) | COO |
| NEW STOUT EXCAVATING GROUP TEXAS, LLC (M23000002606) | President |
| PRECISION FABRICATION SERVICES, LLC (L18000079006) | MGR, |
| PRECISION WEST, LLC (L17000205527) | MGR, |
| T&D POWER, INC. (F10000001386) | Pres |
| DATA CELL SYSTEMS, INC. (F02000004939) | Pres |
| ENVIRONMENTAL AND DEWATERING SOLUTIONS, LLC (L20000206048) | VP |
| HMI SERVICES, INC. (F16000002228) | Pres |
| MASTEC INTERNATIONAL, LLC (L23000558948) | MGR |
| MASTEC PIPELINE ARGENTINA, LLC (L25000346738) | MGR |
| MASTEC SERVICES COMPANY, INC. (P97000088258) | COO |
| MASTEC SPAIN, INC. (P99000000938) | COO |
| OPTIMA NETWORK SERVICES, INC. (F12000003398) | Pres |
| PRECISION INFRASTRUCTURE, LLC (L18000083449) | MGR, |
| PRECISION PIPELINE LLC (M09000000108) | MGR |
