• Canam Steel Corporation

• Cardello Electric Supply Co.

• Carr Corp.

• Champion Elevators, Inc.

• Channellock Inc.

• Chase Industries, Inc.

• Clark Building Systems, Inc.

• Claydon Architectural Metalwork

• Co-Steel Lasco

• Coast Steel Fabricators Ltd.

• Cole Hersee

• Collective Designs

• Comfort Supply Inc.

• Consolidated Steel Services, Inc.

• Conspec

• Crescent Iron Works

• Curtis Products, Inc.

• Customweld Industries

• Dakota Plains Fabrication

• Danos & Curole

• Dave Steel Co.

• Davis Iron Works

• Daws Better Built

• DeHart

• Ebco Industries Ltd.

• Edco Products, Inc.