Just when investors thought Masayoshi Son was reining in risk at SoftBank Group Corp., the billionaire¡¯s foray into highly leveraged derivatives is giving them fresh reason to worry.
SoftBank shares tumbled 7.2 percent Monday in Tokyo, erasing about $9 billion of market value.
The drop came after the conglomerate made massive bets on high-flying technology stocks using equity derivatives ¡ª and despite one report that it has billions in paper gains.
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