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MDU Resources Group, Inc. engages in the regulated energy delivery, and construction materials and services businesses in the United States. It operates through four segments: Electric, Natural Gas Distribution, Pipeline, and Construction Services. The Electric segment generates, transmits, and distributes electricity for residential, commercial, industrial, and municipal customers in Montana, North Dakota, South Dakota, and Wyoming; and operates 3,400 miles of transmission lines, 4,800 miles of distribution lines, and 82 transmission and 298 distribution substations. The Natural Gas Distribution segment distributes natural gas for residential, commercial, and industrial customers in Idaho, Minnesota, Montana, North Dakota, Oregon, South Dakota, Washington, and Wyoming; and supplies related value-added services. The Pipeline segment provides natural gas transportation and underground storage services through a regulated pipeline system primarily in the Rocky Mountain and northern Great Plains regions; and cathodic protection and other energy-related services. The Construction Services segment offers electrical and mechanical contracting services, including the construction and maintenance of electrical and communication wiring and infrastructure, fire suppression systems, mechanical piping, and services; transmission and distribution contracting services, comprise construction and maintenance of overhead and underground electrical, and gas and communication infrastructure; and manufactures and supplies transmission and distribution lines construction equipment and tools. It serves manufacturing, commercial, industrial, transportation, institutional, and renewable and government customers, as well as utilities. MDU Resources Group, Inc. was incorporated in 1924 and is headquartered in Bismarck, North Dakota.

Martin Marietta Materials, Inc., a natural resource-based building materials company, supplies aggregates and heavy-side building materials to the construction industry in the United States and internationally. It offers crushed stone, sand, and gravel products; ready mixed concrete and asphalt; paving products and services; and Portland and specialty cement for use in the infrastructure projects, and nonresidential and residential construction markets, as well as in the railroad, agricultural, utility, and environmental industries. The company also produces magnesia-based chemicals products; dolomitic lime primarily to customers for steel production and soil stabilization; and cement treated materials. Its chemical products are used in flame retardants, wastewater treatment, pulp and paper production, and other environmental applications. The company was founded in 1939 and is headquartered in Raleigh, North Carolina.

Sociedad Química y Minera de Chile S.A. produces and distributes specialty plant nutrients, iodine derivatives, lithium derivatives, potassium chloride and sulfate, industrial chemicals, and other products and services. The company offers specialty plant nutrients, including potassium nitrate, sodium nitrate, sodium potassium nitrate, specialty blends, and other specialty fertilizers. It also provides iodine and its derivatives for use in medical, pharmaceutical, agricultural, and industrial applications comprising x-ray contrast media, polarizing films for LCD and LED, antiseptics, biocides and disinfectants, pharmaceutical synthesis, electronics, pigments, and dye components. In addition, the company offers lithium carbonates for various applications that include electrochemical materials for batteries, frits for the ceramic and enamel industries, heat-resistant glass, air conditioning chemicals, continuous casting powder for steel extrusion, primary aluminum smelting process, pharmaceuticals, and lithium derivatives, as well as ingredient in manufacturing of gunpowder. Further, it supplies lithium hydroxide for the lubricating greases industry, as well as cathodes for batteries. Additionally, it offers potassium chloride and potassium sulfate for various crops, including corn, rice, sugar, soybean, and wheat; industrial chemicals, including sodium nitrate, potassium nitrate, potassium chloride, and solar salts; and other fertilizers and blends. The company operates in Chile, Latin America and the Caribbean, Europe, North America, Asia, and internationally. The company was founded in 1960 and is headquartered in Santiago, Chile.

Teck Resources Limited engages in exploring for, acquiring, developing, and producing natural resources in Asia, Europe, and North America. The company operates through Steelmaking Coal, Copper, Zinc, and Energy segments. Its principal products include copper, zinc, steelmaking coal, and blended bitumen. The company also produces lead, silver, and molybdenum; and various specialty and other metals, chemicals, and fertilizers. In addition, it explores for gold. The company was formerly known as Teck Cominco Limited and changed its name to Teck Resources Limited in April 2009. The company was founded in 1913 and is headquartered in Vancouver, Canada.

Vulcan Materials Company, together with its subsidiaries, produces and supplies construction aggregates primarily in the United States. It operates through four segments: Aggregates, Asphalt, Concrete, and Calcium. The company provides crushed stones, sand and gravel, sand, and other aggregates; and related products and services that are applied in construction and maintenance of highways, streets, and other public works, as well as in the construction of housing and commercial, industrial, and other nonresidential facilities. It also offers asphalt mix and asphalt construction paving services; ready-mixed concrete; and calcium products for the animal feed, plastics, and water treatment industries. The company was formerly known as Virginia Holdco, Inc. and changed its name to Vulcan Materials Company. Vulcan Materials Company was founded in 1909 and is headquartered in Birmingham, Alabama.