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MAS: Masco Corporation manufactures, distributes, and installs home improvement and building products in North America and Europe. It operates in five segments: Cabinets and Related Products, Plumbing Products, Installation and Other Services, Decorative Architectural Products, and Other Specialty Products. The Cabinets and Related Products segment engages in the manufacture and sale of semi-custom, assembled, and ready-to-assemble cabinetry for kitchen, bath, storage, home office, and home entertainment applications. The Plumbing Products segment offers faucet and showering devices, including single- and double-handle faucets, showerheads, handheld showers, and valves; acrylic and gel coated bath and shower enclosure units, shower trays, and laundry tubs; and brass and copper plumbing system components, and other plumbing specialties. The Installation and Other Services segment sells installed building products, such as gutters, after-paint products, framing components, fireplaces, garage doors, and cabinets; and distributes building products, including insulation, insulation accessories, gutters, roofing, and fireplaces. The Decorative Architectural Products segment manufactures architectural coatings, such as paints, primers, specialty paint products, stains, varnishes, and waterproofing products, as well as cabinet, door, window, and other hardware products. The Other Specialty Products segment offers vinyl, fiberglass, and aluminum windows and patio doors; and manual and electric staple gun tackers, staples, and other fastening tools. The company was founded in 1929 and is headquartered in Taylor, Michigan.

APOG: Apogee Enterprises, Inc., through its subsidiaries, engages in the design and development of glass products, services, and systems. The company operates through two segments, Architectural Products and Services, and Large-Scale Optical Technologies. The Architectural Products and Services segment designs, engineers, fabricates, installs, maintains, and renovates the walls of glass, windows, storefront, and entrances comprising the outside skin of commercial and institutional buildings. This segment involves in the fabrication of coated and high-performance architectural glass; installation, maintenance, and renovation of full-service building glass; manufacture of aluminum window systems and curtain walls; paint and anodizing finish of architectural aluminum and PVC shutters; and fabrication of aluminum storefront, entrance, and curtain wall products. This segment markets its products through direct sales, and distribution and independent sales representatives to architects, building owners, general contractors, and glazing subcontractors in the commercial construction market. The Large-Scale Optical Technologies segment manufactures glass and acrylic products for the custom picture framing market and commercial optics. This segment distributes its products through independent distributors and mass merchandisers, as well as directly to museums, and public and private galleries. The company offers its products primarily in the United States, Europe, Australia, and New Zealand. Apogee Enterprises, Inc. was founded in 1949 and is based in Minneapolis, Minnesota.

MDU: MDU Resources Group, Inc. operates as a diversified natural resource company in the United States. The company generates, transmits, and distributes electricity, as well as distributes natural gas. As of December 31, 2010, it provided retail electric services to approximately 124,000 residential, commercial, industrial, and municipal customers in 177 communities and adjacent rural areas; and sold retail natural gas to approximately 839,000 residential, commercial, and industrial customers in 335 communities and adjacent rural areas, as well as provided natural gas transportation services. The company also involves in the construction and maintenance of electric and communication lines, gas pipelines, fire suppression systems, and external lighting and traffic signalization equipment; provides utility excavation services, and inside electrical wiring, cabling, and mechanical services; sells and distributes electrical materials; and manufactures and distributes specialty equipment for utilities and large manufacturing, commercial, industrial, institutional, and government customers. In addition, MDU Resources Group owns and operates approximately 3,700 miles of transmission, gathering, and storage lines, as well as owns, leases, and operates 33 compressor stations in Montana, North Dakota, South Dakota, and Wyoming. Further, the company involves in the acquisition, exploration, development, and production of natural gas and oil resources in Rocky Mountain and Mid-Continent/Gulf States. Additionally, it mines, processes, and sells construction aggregates, including crushed stone, sand, and gravel; produces and sells asphalt mix and supply liquid asphalt for commercial and roadway applications; and supplies ready-mixed concrete, cement, finished concrete products, and other building materials for use in various types of construction, as well as provides related contracting services. The company was founded in 1924 and is based in Bismarck, North Dakota.