EX-21 4 mtz12311210-kex21.htm EXHIBIT MTZ 12.31.12 10-K EX 21


Exhibit 21

MasTec, Inc.
AFFILIATED ENTITIES
December 31, 2012
NORTH AMERICA
 
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.)
 
 
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.)