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 Corporate Executive Board (Nasdaq: EXBD) rallied close to 18% after Zacks published a report in which it made a strong valuation case for the stock.

So what: According to the ratings firm, Corporate Executive Board had an "upside" of 49.9% from its Aug. 10 closing price of $28.58 a share. Zacks also questioned a recent selloff in the stock following last week's upgrade by analysts at Deutsche Bank.

Now what: Fools would probably agree. Most of the 375 to rate the stock in Motley Fool CAPS say it will outperform, resulting in a four-star rating out of a maximum five. How about you? How do you rate Corporate Executive Board at these levels? Weigh in using the comments box below.

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Fool contributorTim Beyers is a member of theMotley 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'sportfolio holdings andFoolish writings, or connect with him on Google+ or Twitter, where he goes by @milehighfool. You can also get his insightsdelivered directly to your RSS reader.

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