EXHIBIT 21 NAME OF SUBSIDIARY INCORPORATION OWNED Advanced Steel Recovery, LLC California 100 AHT, Inc. Pennsylvania 100 CMC (Beijing) International Trade Company Limited China 100 CMC Cometals International S.à r.l. Luxembourg 100 CMC Commercial Metals de Mexico, S. de R.L. de C.V. Mexico 100 CMC Europe GmbH Switzerland 100 CMC GH, LLC Delaware 100 CMC GH, Ltd. Bermuda 100 CMC GH Sisak d.o.o. Croatia 100 CMC International Finance S.à r.l. Luxembourg 100 CMC Poland Sp. z o.o. Poland 100 CMC Post Oklahoma, LLC Delaware 100 CMC Putex Sp. z o.o. Poland 100 CMC Receivables, Inc. Delaware 100 CMC Steel Fabricators, Inc. Texas 100 CMC Steel Oklahoma, LLC Delaware 100 CMC Steel US, LLC Delaware 100 CMC Tensar Holdings Inc. Delaware 100 Com Met Company, S.à r.l. Luxembourg 100 Commercial Metals Company US LLC Delaware 100 Commercial Metals Deutschland GmbH Germany 100 Commercial Metals International GmbH Switzerland 100 Commonwealth Acquisitions Holdings, Inc. Delaware 100 Concrete Pipe & Precast, LLC Delaware 100 EDSCO Fasteners LLC Delaware 100 EDSCO FHR Corporation Delaware 100 Foley Products Company, LLC Delaware 100 Geologics B.V. Netherlands 100 Geopier Foundation Company, Inc. Georgia 100 OCM SSF II Foley Blocker, LLC Delaware 100 Owen Electric Steel Company of South Carolina South Carolina 100 Owen Industrial Products, Inc. South Carolina 100 SMI Steel LLC Alabama 100 SMI-Owen Steel Company, Inc. South Carolina 100 Spartan Concrete, LLC Delaware 100 Structural Metals, Inc. Texas 100 TAC HoldCo, Inc. Delaware 100 Tamco California 100 Tendon Systems, LLC Georgia 100 Tensar Corporation Delaware 100 Tensar Corporation, LLC Georgia 100 Tensar Geosynthetics (China) Limited China 100 Tensar Geosynthetics India Private Limited India 100 Tensar Holdings, LLC Delaware 100 Tensar International B.V. Netherlands 100 Tensar International Co. L.L.C. Dubai (UAE) 100 Tensar International Corporation Georgia 100 Tensar International Design and Consult (Beijing) Limited China 100 Tensar International GmbH Germany 100
EXHIBIT 21 Tensar International Limited United Kingdom 100 Tensar International, LLC Delaware 100 Tensar International Spain S.L. Spain 100 Tensar International s.r.o. Czech Republic 100 Tensar Manufacturing Limited United Kingdom 100 Tensar Polska sp. z o.o. Poland 100 Tensar Technologies Limited United Kingdom 100 The Tensar Group Limited United Kingdom 100 Tower Support Services LLC Delaware 100 TTC UK Holdings Limited United Kingdom 100