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 mobile hydraulic system manufacturer Sauer-Danfoss (NYSE: SHS) surged by more than 15% on Thursday after its quarterly results and full-year guidance breezed past Wall Street expectations.

So what: Fueled by a 46% spike in sales, Sauer-Danfoss posted first-quarter earnings of $70.6 million, or $1.46 per share, versus a per-share profit $0.43 in the year-ago period. The shares are hitting a new 52-week high on particularly heavy volume, so it's obvious that Mr. Market is taking the strong results as a sign of even more good things to come.

Now what: It might be a good time to start taking some money off the table. Even though the company also upped its full-year earnings outlook, CEO Sven Ruder noted that the first quarter is the last in which the company compares figures to a "relatively weak prior-year quarter." So when you couple ever-tougher future comparisons with the stock's staggering 320% return over the past nine months, lightening up on Sauer-Danfoss seems prudent.

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