91 Wireless's former parent NetDragon paid just 100,000 yuan to buy this company in 2007. Now the acquisition puts its worth at $1.9 billion, or 11.6 billion yuan. That means valuation jumped 110,000 times in six years.

91 Wireless is one of the leading mobile app marketplaces and mobile game operators in China. The company says it's sold more than 10 billion games so far. 91 Wireless also develops its own apps, including e-reader app Panda Reader, video app Panda Video, and Android home-replacement app 91 Launcher. These apps are likely to integrate well with existing Baidu services.