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 Exterran Holdings (NYSE: EXH) rose more than 11% in early trading before closing up 10%. The rally came just three trading days after the stock hit a new 52-week low of $8.07 a share.

So what: No specific news fueled the rally, but I'm not sure it matters. Judging by the pattern -- sharp decline followed by a volume-driven rally -- it looks as if Big Money investors saw Friday's selloff as an opportunity.

Now what: Rising oil prices could also be to blame, but fleet operators such as DryShips (Nasdaq: DRYS) and Transocean (NYSE: RIG) fell as Exterran rallied today. Industrywide forces don't seem to be responsible for the gains. Either way, Exterran is growing fast and on track to cut net losses in half next year. Is that enough momentum to get you interested? Would you buy shares of Exterran Holdings at these levels? Please weigh in using the comments box below.

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Fool contributor Tim Beyers is a member of the Motley Fool Rule Breakers stock-picking team. He didn't own shares in any of the companies mentioned in this article at the time of publication. Check out Tim's portfolio holdings and Foolish writings, or connect with him on Google+ or Twitter, where he goes by @milehighfool. You can also get his insights delivered directly to your RSS reader.

The Motley Fool owns shares of Transocean. Try any of our Foolish newsletter services free for 30 days. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.