Mitsubishi UFJ Financial Group (Mitsubishi UFJ Financial Group, Inc., or MUFG) is a large financial institution formed by the merger of Mitsubishi Tokyo Financial Group and Japan Union Holdings in 2005. (MUFG) is a large financial institution formed by the merger of Tokyo-Mitsubishi Financial Group and Japan Union Holdings in 2005, and is the largest financial institution in Japan, with assets ranked among the top in the world. MUFG is the largest financial institution in Japan and has the largest assets in the world;