20. Tencent founder Zhang Zhidong gained $184 million

Also known as Tony Zhang, Chinese businessman Zhang Zhidong is the co-founder and former chief technology officer of Tencent, the Chinese tech conglomerate recently embroiled in the Blizzard-Hong Kong controversy (Tencent part owns Activision Blizzard, Blizzard's parent company).

Total net worth: $13.7 billion
Year-to-date change in net worth: +$184 million