• Clamshell Buildings

• Clark Building Systems, Inc.

• Clestra Cleanroom

• Cleveland Steel Specialty Company

• Columbia Equipment Company, Inc.

• Composite Panel Association

• Composite Structures, Inc.

• Concept Storage Solutions (Redirack)

• Concrete, Inc.

• Connor Sports Flooring Corporation

• Conservatek Industries

• Construction Design Technologies

• Continental Bridge

• Contour Seats

• Copeland Corporation

• Coronis Building Systems

• Cover-All Building Systems

• Crissey Fowler Lumber Co.

• Crystal Fountains

• Cushing Truss Mfg.

• Dant Clayton Corporation

• Decks Plus

• Delta Scientific Corp.

• Deluxe Storage Systems

• Designs Unlimited

• Ductmate Industries