Steel Business Division
| Company Name | Main Business | Country of Operation |
|---|---|---|
 Isuzu Corporation |
Steel processing and sales | Japan |
| Kyushu Steel Center Co., Ltd. |
Steel (thick plates) processing | Japan |
| Kyushu Steel Corporation |
Steel (building materials) manufacturing | Japan |
| Koho CD Bars Service Center Co., Ltd. | Steel (cold finished steel bars, special steel, etc.) sales | Japan |
| MC Metal Service Asia (Thiland) Co., Ltd. | Steel processing and sales | Thailand |
| Metal One Corporation |
Steel products operations | Japan |
| Metal One Holdings America, Inc. | Holding company of steel processing and sales business | U.S.A. |
| Metal One Specialty Steel Corporation |
Special steel processing and sales | Japan |
| Metal One SSS West Japan, Ltd. |
Steel (building materials) processing and sales | Japan |
| Metal One Stainless (Asia) Pte.Ltd. | Steel (stainless) processing and sales | Singapore |
| Metal One Steel Service Corporation | Steel processing and sales | Japan |
| Metal One Structural Steel & Resource Corporation |
Steel (building materials) processing and sales | Japan |
| Metal One Ryowa Corporation |
Steel processing and sales | Japan |
| M.O.TEC CORPORATION |
Construction materials rentals and sales | Japan |
| OTOFUJI Corporation |
Sales of steel pipes and accessories | Japan |
| Sanwa Tekko Co., Ltd. | Steel processing and sales | Japan |
| Siam Hi-Tech Steel Center Co., Ltd. | Steel processing and sales | Thailand |
| Sus-Tech Corporation |
Steel (stainless) processing and sales | Japan |
| Tamatsukuri Corporation |
Steel (thick plates) processing and sales | Japan |
Ferrous Raw Materials Division
| Company Name | Main Business | Country of Operation |
|---|---|---|
| Hernic Ferrochrome (Pty) Ltd. | Production and sales of ferrochrome in South Africa | Republic of South Africa |
| Iron Ore Company of Canada |
Iron ore production and sales | Canada |
| M.C. Inversiones Limitada | Investment company for Los Colorados iron ore mine | Chile |
| MC Iron Ore Sales Inc. | Partner in partnership (IOC OS) selling Iron Ore Company of Canada iron ore | U.S.A. |
| Mitsubishi Development Pty Ltd | Investment, production and sales of coals and other metals resources | Australia |
Non-Ferrous Metals Division
| Company Name | Main Business | Country of Operation |
|---|---|---|
| JECO Corporation | Investment company for Minera Escondida Ltda. copper mines in Chile | Japan |
| Mitsubishi Corporation Unimetals Ltd. |
Trading company | Japan |
| NIKKEI MC ALUMINIUM CO., LTD. |
Manufacturing and sales of secondary aluminum alloy ingots | Japan |
| MC Copper Holdings B.V. | Investment company for Los Pelambres copper mine in Chile | The Netherlands |
| Mitsubishi Corporation Futures Ltd. |
Commodity broker | Japan |
| Mitsubishi Shoji Light Metal Sales Corporation |
Trading of aluminium ingots and scrap | Japan |
| MOZAL S.A.R.L | Production and sale of aluminium ingots | Mozanbique |
| Petro-Diamond Risk Management Ltd. | Energy risk management | U.K. |
| Ryowa Development Pty., Ltd. | Investment company for BOYNE aluminum smelter and sales of aluminum | Australia |
| Ryowa Development II Pty., Ltd. | Investment company for BOYNE aluminum smelter and sales of aluminum | Australia |
| Siam MCT Telecom Ltd. | Leasing of telecommunications equipment | Thailand |
| Triland Metals Ltd. | Commodity broker on the London Metal Exchange (LME) | U.K. |
| Triland USA Inc. | Commodity broker | U.S.A. |
