• Marco Specialty steel, Inc.

• Maxcess Technologies

• McGill Architectural Products

• McMillan Smith & Partners, PLLC

• Metal Master

• Metalfab, Inc.

• Metro Fence Company, Inc.

• Milbro Refractories, Inc.

• Miller Electric Construction Inc.

• Mine Safety Appliances Co.

• Modern Light Metals

• Monarch Industries Ltd.

• Morton Mfg. Co.

• Mueller Ornamental Iron Works Inc.

• MultiDrain EconoDrain

• Neenah Foundry Co.

• Nemato Composites Inc.

• Nichols Brosch Sandoval Inc.

• Niland Company

• Norstar Industries

• North Shore Supply Co. Steel Division

• Northwest Grating Products

• Paco Corp.

• Paco Corporation

• Perkins Pryde Kennedy + Steevensz

• Precisioneering Ltd.