Tomohiro Ohsumi/Getty Images Masayoshi Son, the billionaire founder and CEO of Japanese holding company SoftBank, is worth an estimated $16.3 billion, according to Bloomberg’s Billionaires Index. He’s the second-richest person in Japan after Uniqlo founder Tadashi Yanai. Through SoftBank and his $100 billion Vision Fund, Son invests millions in some of Silicon Valley’s biggest tech […]