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 Compellent Technologies (NYSE: CML) rose more than 10% in intraday trading on no news whatsoever.

So what: Buyout speculation may have fueled the rally. Compellent provides networked storage technology, and in the wake of the 3PAR bidding war and Isilon Systems (Nasdaq: ISLN) positioning itself for an acquisition, speculative sharks are swimming in these waters.

Now what: Both Dell (Nasdaq: DELL) and EMC (NYSE: EMC) have the capital and needs to buy a company like Compellent. Trouble is, rumors come and go quickly, and buying on momentum can make for a dangerous bet. Proceed with caution.

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