Billionaire Masayoshi Son, chairman and chief executive officer of SoftBank Group Corp., left, looks on as he sits beside Nikesh Arora, president and chief operating officer of SoftBank Group Corp., during a news conference in Tokyo, Japan, on Tuesday, May 10, 2016. SoftBank quarterly profit dived 30 percent as the Japanese company struggled to turn around unprofitable U.S. carrier Sprint Corp. Photographer: Tomohiro Ohsumi/Bloomberg via Getty Images