SoftBank Makes $58 Billion on Alibaba With Buffett-Style Returns

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With Alibaba Group Holding Ltd. filing to go public, the biggest winner won’t be founder Jack Ma or his fellow executives or even venture capital backers like Silver Lake Management LLC. It’ll be Japan’s Masayoshi Son.

Fourteen years ago, Son’s SoftBank Corp. started with a $20 million bet on a then-unknown Web portal connecting Chinese manufacturers with overseas buyers. That site evolved into China’s biggest Internet shopping mall and SoftBank’s stake is now estimated to be worth about $58 billion, an exceptional return even by Silicon Valley’s standards.