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: Shares of shipping company YRC Worldwide (NASDAQ:YRCW) jumped 15% today after reporting earnings.

So what: Fourth-quarter revenue rose 3% to $1.21 billion and swung to a small profit of $400,000. On a per-share basis, the company lost $1.71, which was still lower than the $2.77 loss analysts expected.  

Now what: We're still not seeing the benefits from a union contract reached earlier this year, so it's hard to say what earnings look like for 2014. I think this is a risky stock, given the low growth rate and mounting losses. That's why I'm not a buyer despite the pop today.