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Alcoa Corporation, together with its subsidiaries, produces and sells bauxite, alumina, and aluminum products in the United States, Spain, Australia, Iceland, Norway, Brazil, Canada, and internationally. The company operates through two segments, Alumina and Aluminum. It engages in bauxite mining operations; and processes bauxite into alumina and sells it to customers who process it into industrial chemical products, as well as aluminum smelting and casting businesses. The company offers primary aluminum in the form of alloy ingot or value-add ingot to customers that produce products for the transportation, building and construction, packaging, wire, and other industrial markets; and flat-rolled aluminum in the form of sheet, which is sold primarily to customers that produce beverage and food cans. In addition, it owns hydro power plants that generates and sells electricity in the wholesale market to traders, large industrial consumers, distribution companies, and other generation companies. The company was formerly known as Alcoa Upstream Corporation and changed its name to Alcoa Corporation in October 2016. The company was founded in 1886 and is headquartered in Pittsburgh, Pennsylvania.

Aluminum Corporation of China Limited, together with its subsidiaries, manufactures and sells alumina, primary aluminum, aluminum alloys, and carbon products in the People's Republic of China and internationally. The company operates through five segments: Alumina, Primary Aluminum, Trading, Energy, and Corporate and Other Operating. The Alumina segment mines for and purchases bauxite and other raw materials; refines bauxite into alumina; and produces and sells alumina, as well as refined alumina, gallium, and multi-form alumina bauxite. The Primary Aluminum segment procures alumina and other raw materials, supplemental materials, and electrical power; and produces and sells aluminum and aluminum-related products, such as carbon, aluminum alloy, and other electrolytic aluminum products. The Trading segment trades in alumina, primary aluminum, aluminum fabrication products, other non-ferrous metal products, coal products, and raw and supplemental materials; and provides logistics and transport services to external customers. The Energy segment mines for coal deposits; generates and sells electricity using thermal, wind, and solar power sources to regional power grid corporations; and manufactures power related equipment. The Corporate and Other Operating segment provides research and development services; and operates other aluminum-related business activities. The company also acquires, manufactures, and distributes bauxite mines and limestone ore; and provides engineering project management, as well as engages in import and export activities. Aluminum Corporation of China Limited was incorporated in 2001 and is headquartered in Beijing, the People's Republic of China.

Century Aluminum Company, together with its subsidiaries, engages in the production of standard-grade and value-added primary aluminum products in the United States and Iceland. It also owns and operates an alumina production facility in Iceland, and a carbon anode production facility in the Netherlands. The company was founded in 1995 and is headquartered in Chicago, Illinois.

Norsk Hydro ASA engages in the power production, bauxite extraction, alumina refining, aluminium smelting, and recycling activities; and provision of extruded solutions worldwide. It operates through Hydro Bauxite & Alumina, Hydro Aluminium Metal, Hydro Metal Markets, Hydro Extrusions, and Hydro Energy segments. The Hydro Bauxite & Alumina segment engages in bauxite mining activities, production of alumina, and related commercial activities, primarily the sale of alumina. The Hydro Aluminium Metal segment is involved in the primary aluminum production casting activities. This segment principally offers extrusion ingots, foundry alloys, and sheet and standard ingots. The Metal Markets segment sells products from the company's primary metal plants; operates recyclers; and trades in physical and financial metals. The Hydro Extrusions segment offers extrusion profiles, building systems, and precision tubing products for construction, automotive and heating, and ventilation and air conditioning sectors, as well as operates recycling facilities. The Hydro Energy segment engages in the trading and wholesale business in Brazil; energy sourcing operations; and operation of power stations in Norway, as well as renewable energy production, such as wind and solar, battery materials, and green hydrogen. Norsk Hydro ASA was founded in 1905 and is headquartered in Oslo, Norway.