EX-21 5 mtz12312010-kex21.htm EX-21
Exhibit 21
MasTec, Inc.
SUBSIDIARIES OF MASTEC, INC.
December 31, 2020
NORTH AMERICA

Cash Construction Company, Inc. (TX) | (100% owned by MasTec North America, Inc.)
EC Source Services, LLC (FL) | (100% owned by MasTec, Inc.)
MasTec Canada, Inc. (Canada) | (100% owned by Pacer Construction Holdings Corporation (Canada)) (100% owned by MasTec Canadian Holdco ULC (Canada)) (100% owned by MasTec Cooperateif (UA))
MasTec Comanche, LLC (FL) | (100% owned by MasTec Pipeline Holdings, LLC)
MasTec Cooperateif (UA) (NL) | (99.99% owned by MasTec North America, Inc.) (0.01% owned by MasTec Foreign Holdings, LLC (FL))
MasTec Lux Foreign Finance S.a r.l. | (100% owned by MasTec FFH, Inc. (FL)) (100% owned by MasTec North America, Inc.)
MasTec Network Solutions, LLC f/k/a Nsoro MasTec, LLC (FL) | (100% owned by MasTec, Inc.)
MasTec North America, Inc. (FL) | (100% owned by MasTec, Inc.)
MasTec Pipeline Holdings, LLC (FL) | (100% owned by MasTec, Inc.)
MasTec TPP, LLC (FL) | (100% owned by MasTec Pipeline Holdings, LLC)
Precision Pipeline LLC (WI) | (100% owned by Precision Acquisition, LLC (WI)) (100% owned by MasTec, Inc.)
Pumpco, Inc. (TX) | (100% owned by MasTec North America, Inc.)
SEFNCO Communications, Inc. (CA) | (100% owned by MasTec North America, Inc.)
Three Phase Line Construction, Inc. (NH) | (100% owned by MasTec, Inc.)
Wanzek Construction, Inc. (ND) | (100% owned by MasTec North America, Inc.)

Certain other subsidiaries have been omitted because, in the aggregate, they would not constitute a significant subsidiary.