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Billionaire Taizo Son Emerges With ‘Puzzle & Dragons’ App

Taizo Son, the youngest brother of SoftBank Corp. magnate Masayoshi Son, has become a billionaire after shares of his company GungHo Online Entertainment Inc. soared more than 10-fold this year.

The GungHo chairman holds a 27.8 percent stake in the Tokyo-based company. The shares account for almost all of his $3.3 billion fortune, according to the Bloomberg Billionaires Index. Taizo Son has never appeared on an international wealth ranking. His older brother’s SoftBank holds a 40 percent stake and was an early GungHo investor in 2002.