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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