ArcelorMittal S.A., together with its subsidiaries, operates as integrated steel and mining companies in the United States, Europe, and internationally. It offers semi-finished flat products, including slabs; finished flat products comprising plates, hot- and cold-rolled coils and sheets, hot-dipped and electro-galvanized coils and sheets, tinplate, and color coated coils and sheets; semi-finished long products, such as blooms and billets; finished long products consisting of bars, wire-rods, structural sections, rails, sheet piles, and wire-products; and seamless and welded pipes and tubes. The company also provides mining products, such as iron ore lumps, fines, concentrates, pellets, and sinter feeds; and coking coal. It sells its products to various customers in the automotive, appliance, engineering, construction, energy, and machinery industries through a centralized marketing organization, as well as distributors. The company has iron ore mining activities in Brazil, Bosnia, Canada, Liberia, Mexico, South Africa, and Ukraine. ArcelorMittal S.A. was founded in 1976 and is headquartered in Luxembourg City, Luxembourg.

Steel Dynamics, Inc., together with its subsidiaries, operates as a steel producer and metal recycler in the United States. The Steel Operations segment offers hot rolled, cold rolled, and coated steel products; parallel flange beams and channel sections, flat bars, large unequal leg angles, and reinforcing steel bars, as well as standard strength carbon, intermediate alloy hardness, and premium grade rail products; engineered special-bar-quality products, merchant-bar-quality products, and other engineered round steel bars; channels, angles, flats, merchant rounds, and reinforcing steel bars; and specialty shapes and light structural steel products. This segment also engages in turning, polishing, straightening, chamfering, precision saw-cutting, and heat treating of bar products. Its products are used in construction, automotive, manufacturing, transportation, heavy and agriculture equipment, and pipe and tube markets. The Metals Recycling Operations segment is involved in the ferrous and nonferrous scrap metal processing, transportation, marketing, brokerage, and scrap management services. Its ferrous products include heavy melting steel, busheling, bundled scrap, shredded scrap, steel turnings, and cast-iron products; and nonferrous products comprise aluminum, brass, copper, stainless steel, and other nonferrous metals. The Steel Fabrication Operations segment produces steel non-residential building components, such as steel joists, girders, trusses, and steel deck products for non-residential steel fabricators, metal building companies, general construction contractors, developers, owners, brokers, and governmental entities, as well as e-commerce warehouses, data centers, metal buildings, and education and commercial building projects. The Aluminum Operations segment offers recycled aluminum flat rolled products. The company also exports its products. Steel Dynamics, Inc. was founded in 1993 and is headquartered in Fort Wayne, Indiana.

United States Steel Corporation produces and sells flat-rolled and tubular steel products primarily in North America and Europe. The company operates through North American Flat-Rolled (Flat-Rolled), Mini Mill, U. S. Steel Europe (USSE), and Tubular Products (Tubular) segments. The Flat-Rolled segment offers slabs, strip mill plates, sheets, and tin mill products, as well as iron ore and coke. This segment serves customers in the service center, conversion, transportation, automotive, construction, container, appliance, and electrical markets. The Mini Mill segment provides hot-rolled, cold-rolled, and coated sheets and electrical steel products. This segment serves customers in the automotive, construction, pipe and tube, sheet converter, electrical, solar industrial equipment, and service center markets. The USSE segment provides slabs, strip mill plates, sheets, tin mill products, and spiral welded pipes. This segment serves customers in the construction, container, appliance and electrical, service center, conversion, oil, gas, and petrochemical markets. The Tubular segment offers seamless and electric resistance welded steel casing and tubing products, as well as standard and line pipe and mechanical tubing products primarily to customers in the oil, gas, and petrochemical markets. It also engages in the real estate business. United States Steel Corporation was founded in 1901 and is headquartered in Pittsburgh, Pennsylvania.

Gerdau S.A., together with its subsidiaries, operates as a steel producer company. The company operates through Brazil Business, North America Business, South America Business, and Special Steel Business segments. It also provides semi-finished products, including billets, blooms, and slabs; common long rolled products, such as rebars, wire rods, merchant bars, light shapes, and profiles to the construction and manufacturing industries; drawn products comprising barbed and barbless fence wires, galvanized wires, fences, concrete reinforcing wire mesh, nails, and clamps for manufacturing, construction, and agricultural industries; and special steel products used in auto parts, light and heavy vehicles, and agricultural machinery, as well as in the oil and gas, wind energy, machinery and equipment, mining and rail, and other markets. In addition, the company offers flat products, such as hot-rolled steel coils and heavy plates; and resells flat steel products. Further, it operates mines that produce iron ore located in the Brazilian state of Minas Gerais. The company sells its products through independent distributors, direct sales from the mills, and its retail network. Gerdau S.A. was founded in 1901 and is based in São Paulo, Brazil.

Companhia Siderúrgica Nacional operates as an integrated steel producer in Brazil and Latin America. It operates through five segments: Steel Industry, Mining, Logistics, Energy, and Cement. The company offers flat steel products, such as hot and cold rolled, galvanized, galvalume, pre-painted, and metal sheets products; coil, sheets, and derivatives; tiles and derivatives, pipes, and profiles; long steel products; steel packaging solutions for the food industry; chemical packaging solution; and carbochemical products. It also provides steel cutting services; produces and sells cement; operates railway and port facilities; and generates electric power from its thermoelectric co-generation and hydroelectric power plants. In addition, the company explores for iron ore reserves at Casa de Pedra and Engenho mines located in the city of Congonhas; and limestone and dolomite at the Bocaina mine located in the city of Arcos in the state of Minas Gerais, Brazil, as well as produces tin. Companhia Siderúrgica Nacional was founded in 1941 and is headquartered in São Paulo, Brazil.

Metallus Inc. manufactures and sells alloy steel, and carbon and micro-alloy steel products in the United States and internationally. The company offers special bar quality (SBQ) bars, seamless mechanical tubes, precision steel components, and billets that are used in gears, hubs, axles, crankshafts and motor shafts, oil country drill pipes, bits and collars, bearing races and rolling elements, bushings, fuel injectors, wind energy shafts, anti-friction bearings, artillery and mortar bodies, and other applications. It also provides custom-make precision steel components. It offers its products and services to the automotive, energy, industrial equipment, mining, construction, rail, aerospace and defense, heavy truck, agriculture, and power generation sectors. The company was formerly known as TimkenSteel Corporation and changed its name to Metallus Inc. in February 2024. Metallus Inc. was founded in 1899 and is headquartered in Canton, Ohio.

Algoma Steel Group Inc. produces and sells steel products primarily in North America. The company provides flat/sheet steel products, including temper rolling, cold rolled, hot-rolled pickled and oiled products, floor plate, and cut-to-length products for the automotive industry, hollow structural product manufacturers, and the light manufacturing and transportation industries; and plate steel products that consist of rolled, hot-rolled, and heat-treated for use in the construction or manufacture of railcars, buildings, bridges, off-highway equipment, storage tanks, ships, and military applications, as well as energy and mining applications. Algoma Steel Group Inc. was founded in 1901 and is headquartered in Sault Ste. Marie, Canada.

Olympic Steel, Inc. processes, distributes, and stores metal products primarily in the United States, Canada, and Mexico. It operates in three segments: Carbon Flat Products; Specialty Metals Flat Products; and Tubular and Pipe Products. The company offers stainless steel and aluminum coil and sheet products, angles, rounds, and flat bars; alloy, heat treated, and abrasion resistant coils, sheets and plates; coated metals, including galvanized, galvannealed, electro galvanized, advanced high strength steels, aluminized, and automotive grades of steel; commercial quality, advanced high strength steel, drawing steel, and automotive grades cold rolled steel coil and sheet products; hot rolled carbon comprising hot rolled coil, pickled and oiled sheet and plate steel products, automotive grades, advanced high strength steels, and high strength low alloys; tube, pipe, and bar products, including round, square, and rectangular mechanical and structural tubing; hydraulic and stainless tubing; boiler tubing; carbon, stainless, and aluminum pipes; valves and fittings; and tin mill products, such as electrolytic tinplate, electrolytic chromium coated steel, and black plates. The company also provides cutting-to-length, slitting, shearing, blanking, tempering, stretcher-leveling, plate and laser processing, forming and machining, tube processing, finishing, and fabrication services, as well as value-added services, such as saw cutting, laser cutting, beveling, threading, and grooving services. It serves metal consuming industries, such as manufacturers and fabricators of transportation and material handling lift equipment, construction, mining and farm equipment, agriculture equipment, storage tanks, environmental and energy generation equipment, automobiles, food service, and electrical equipment, as well as general and plate fabricators, and metals service centers through direct sales force. Olympic Steel, Inc. was founded in 1954 and is based in Highland Hills, Ohio.