There have been much larger diamond hands scenarios. A Japan dotcom bubble billionaire, Yasumitsu Shigeta, went from $42 billion at the peak in 2000, down to $

There have been much larger diamond hands scenarios. A Japan dotcom bubble billionaire, Yasumitsu Shigeta, went from $42 billion at the peak in 2000, down to $600m by 2009 as his shares of Hikari Tsushin (mobile phone distributor) sank. Still extraordinarily rich, however that's a remarkable $41 billion decline. He went from being worth $1b to $25b in one year in 1999. Masayoshi Son rode Softbank down by something around $75b after the dotcom bubble. Softbank lost 98% of its stock market value. There were obviously a lot of billionaire wipeouts during the US dotcom bubble as well, as people held and sank, although none quite as dramatic as those two declines.