SoftBank plunges 19%, its biggest drop since 1998 IPO; $2.6 bn wiped off Masayoshi Son’s fortune

Shares were down 8% Friday in Tokyo. Over two days, the technology conglomerate is down roughly 14%. Even after the recent plunge, Son is up about $2.7 billion from the $11.3 billion he began the year with, according to the Bloomberg Billionaires Index.