The Mitsubishi Group (三菱グループ Mitsubishi Gurūpu?), Mitsubishi Group of Companies, or Mitsubishi Companies is a Japanese conglomerate consisting of a range of autonomous businesses which share the Mitsubishi brand, trademark and legacy. The Mitsubishi group of companies form a loose entity, the Mitsubishi Keiretsu, which is often referenced in Japanese and US media and official reports; in general these companies all descend from the zaibatsu of the same name. The top 25 companies are also members of the Mitsubishi Kin'yōkai, or "Friday Club", and meet monthly. The Mitsubishi.com Committee is meant to facilitate communication and access of the brand through a portal web site.
Source : http://en.wikipedia.org/wiki/Mitsubishi