A pair of Chinese firms, 500.com Ltd. and Sungy Mobile Ltd., saw their stocks soar on November 22 when they made their debut on the U.S. stock markets.

After its first day of trading on the New York Stock Exchange, stocks of China's leading online sports lottery service provider 500.com Ltd. closed at $20.01 per share, up almost 54 percent from the price of its IPO.

On the same day, stocks of Sungy Mobile, a leading global provider of mobile Internet products and services, rallied nearly 19 percent to close at $13.35 a share. It set its IPO on the floor of NASDAQ Global Market under ticker symbol GOMO.

Sungy Mobile provides applications and mobile platform development. Its platform product GO Launcher EX manages apps, widgets and functions on Android smartphones and serves as users' first entry point to their phones.