Check a chart of SINA in early-to-mid 2003. Shares went from $9 to $40 in six months. You're in the online Chinese space. Wild price swings to the upside, especially when business model proves not to be fraudulent, can be expected. That's also why shorting these stocks is so risky as well. May work, but may lose everything as well. The best thing to do is buy, hold six months to a year and take profit while implementing careful stop loss orders along the way.