Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: China MediaExpress (Nasdaq: CCME) shares are up 12% in intraday trading today.

So what: It looks like the short squeeze is on for China MediaExpress. A big short interest in the stock has been under pressure since the company released earnings earlier this month.

Now what: A sharp rise on a short squeeze can be a pretty short-term phenomenon, so be careful buying this bump. If you're looking to buy the stock long-term, I would wait for some stability in the next few weeks. This stock has been pretty volatile, and the drop in the last week looks like a good spots for shorts to get out, pushing up the stock today.

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