Jabarkan Pembentukan Mitsui Group dari Mitsui

Perusahaan yang saat ini berasosiasi dengan keiretsu Mitsui, antara lain Mitsui & Co., Sumitomo Mitsui Trust Holdings, Japan Steel Works, Mitsui Chemicals, Mitsui Construction Co., Mitsui Engineering & Shipbuilding, Mitsui Fudosan, Mitsui-gold, Mitsui Mining & Smelting Co., Ltd., Mitsui Oil Exploration Co. (MOECO), Mitsui O.S.K. Lines, Mitsui Petrochemical Industries Ltd, Mitsui-Soko, Mitsui Sumitomo Insurance Group, Oji Paper Company, Pacific Coast Recycling, Sumitomo Mitsui Banking Corporation, Taiheiyo Cement, Toray Industries, Toshiba Corporation, Tri-net Logistics Management, dan Mitsui Commodity Risk Management [MCRM].

Perusahaan milik Mitsui yang masuk dalam Nikkei 225