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.

Haynes International, Inc. develops, manufactures, markets, and distributes nickel and cobalt-based alloys in sheet, coil, and plate forms in the United States, Europe, China, and internationally. The company offers high-temperature resistant alloys used by manufacturers of equipment, including jet engines for the aerospace market, gas turbine engines for power generation, and industrial heating equipment. It also provides corrosion-resistant alloys used in various applications, including chemical processing, power plant emissions control, and hazardous waste treatment. In addition, its products also have applications in flue-gas desulfurization, oil and gas, waste incineration, industrial heat treating, automotive, thermocouples, sensors and instrumentation, biopharmaceuticals, solar, and nuclear fuel. Further, the company produces its products in various forms, such as seamless and welded tubulars, slab, bar, billet, and wire. Additionally, it sells its products primarily through direct sales organizations, and network of independent distributors and sales agents. Haynes International, Inc. was founded in 1912 and is headquartered in Kokomo, Indiana. As of November 21, 2024, Haynes International, Inc. operates as a subsidiary of North American Stainless, Inc.

Steel Partners Holdings L.P., together with its subsidiaries, engages in industrial products, energy, banking, defense, supply chain management, logistics, and youth sports businesses worldwide. It operates through Diversified Industrial, Energy, Financial Services, and Supply Chain segments. The company fabricates precious metals and alloys into brazing alloys; manufactures and sells seamless stainless steel tubing coils; fasteners, adhesives, and fastening systems for the commercial low slope roofing industry, as well as specialty fasteners for the building products industry; and woven substrates of fiberglass, quartz, carbon, and aramid materials for specialty applications. It also designs, manufactures, and markets power electronics and protection, motion control, power quality electromagnetic equipment, custom ball-screws, and gears and gearboxes used in medical, commercial and military aerospace, computer, datacom, industrial, specialty LED lighting, test and measurement, and telecom applications. In addition, the company provides meat-room blade products, repair services, and distributed products for the meat and deli departments of supermarkets, restaurants, and meat and fish processing plants, as well as for electrical saws and cutting equipment distributors; cutting blades for bakeries; and wood cutting blade products for the pallet manufacturing, pallet recycler, and portable saw mill industries. Further, it manufactures and distributes coated, laminated and metallized films for imaging, aerospace, insulation and solar photo-voltaic markets; originates and funds consumer and small business loans; issues credit cards; takes deposits; participates in syndicated commercial and industrial, and asset based credit facilities and securitizations; and offers drilling and production services to the oil and gas industry. Steel Partners Holdings GP Inc. serves as the general partner of the company. The company was founded in 1990 and is based in New York, New York.

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.

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.

Ampco-Pittsburgh Corporation, together with its subsidiaries, engages in manufacture and sale of specialty metal products and customized equipment to commercial and industrial users worldwide. The company operates through Forged and Cast Engineered Products (FCEP); and Air and Liquid Processing (ALP) segments. The FCEP segment produces forged hardened steel rolls, cast rolls and, forged engineered products that are used in cold rolling mills by producers of steel, aluminum, and other metals; cast rolls for hot strip mills, medium/heavy section mills, roughing mills, and plate mills; and forged engineered products for narrow and wide strip and aluminum mills, back-up rolls for narrow strip mills, and leveling rolls and shafts. The ALP segment produces custom-engineered finned tube heat exchange coils and related heat transfer products for various industries, including OEM/commercial, nuclear power generation, and industrial manufacturing; custom-designed air handling systems for institutional, pharmaceutical, and general industrial building markets; and manufacture centrifugal pumps for the fossil fueled power generation, marine defense, and industrial refrigeration industries. Ampco-Pittsburgh Corporation was incorporated in 1929 and is headquartered in Carnegie, Pennsylvania.