In Japan, SoftBank is a telecommunications and Internet corporation headquartered in Tokyo. The company was founded in September 1981 by Masayoshi Son, who is currently the chairman and CEO. As of 2019, SoftBank owns stakes in many companies including Alibaba Group, Yahoo! Japan, Sprint Corporation, Boston Dynamics, and Arm Holdings. In March 2000, SoftBank became the largest shareholder of Yahoo! Inc. with a 19% stake.
SoftBank's mobile installer business provides cell phone service to users in Japan. As of June 2015, the company had 31 million subscribers. In addition to cell phone service, SoftBank's mobile installer business also offers broadband Internet service and mobile payments through its Y! Mobile brand.