Kōtō
() is the holding company of , the fifth-largest banking group in Japan as of 2012. It is headquartered in the Kiba area of Koto, Tokyo. The main operating entities of the group are Resona Bank, a nationwide corporate and retail bank headquartered in Osaka, and Saitama Resona Bank, a smaller bank headquartered in Saitama City which primarily serves Saitama Prefecture. Most of these banks' operations are descended from Daiwa Bank and Asahi Bank, which merged in 2003.