MUFG Bank, Ltd. (株式会社三菱UFJ銀行) is a Japanese bank and the core banking subsidiary of the Mitsubishi UFJ Financial Group (MUFG). It was established on January 1, 2006 through the merger of the Bank of Tokyo-Mitsubishi (株式会社東京三菱銀行) and UFJ Bank (株式会社ユーエフジェイ銀行), two major banking groups that themselves were the product of recent banking mergers. The bank was first named Bank of Tokyo Mitsubishi UFJ, initialed as BTMU, before rebranding as MUFG Bank in July 2018. MUFG Bank, along with Sumitomo Mitsui Banking Corporation and Mizuho Bank, is recognized as one of the three so-called megabanks in Japan. As of June 23, 2019, it was ranked as the largest bank in Japan and the third largest in the world. The bank's head office is in Marunouchi, Chiyoda, Tokyo, and it has 772 other offices in Japan and 76 offices overseas.