EX-21 10 mtz12311310-kex21.htm EXHIBIT
Exhibit 21
MasTec, Inc.
AFFILIATED ENTITIES
December 31, 2013
NORTH AMERICA

Big Country Energy Services, Inc. (Canada) | (100% owned by BC Acquisition I, LTD. (Canada) (100% owned by MasTec Cooperateif (UA)
Big Country Energy Services LLC.(US) | (100% owned by MasTec North America, Inc.)
Bottom Line Services, LLC (DE) | (94% owned by MasTec North America, Inc.) (6% owned by Alan Roberts)
Dynamic Tower Services, Inc. (LA) | (100% owned by MasTec North America, Inc.)
EC Source Services, LLC (FL) | (100% owned by MasTec, Inc.)
MasTec Network Solutions f/k/a Nsoro MasTec, LLC (FL) | (100% owned by MasTec, Inc.)
MasTec North America, Inc. (FL) | (100% owned by MasTec, Inc.)
Patch Point Energy Services LTD. (Canada) | 100% owned by BC Acquisition II, LTD. (Canada) (100% owned by MasTec Cooperateif (UA)
Precision Acquisition, LLC (WI) | (100% owned by MasTec, Inc.)
Precision Pipeline LLC (WI) | (100% owned by Precision Acquisition, LLC)
Pumpco, Inc. (TX) | (100% owned by MasTec North America, Inc.)
Wanzek Construction, Inc. (ND) | (100% owned by MasTec North America, Inc.)