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 hydrocarbon and industrial gas equipment manufacturer Chart Industries (Nasdaq: GTLS) were up as much as 10% in intraday trading today on higher-than-average volume.

So what: Back in November, I suggested that investors wait to see if Chart's shares would cool off. No such luck. Since mid-November, the shares have tacked on an astonishing 54%. Today's jump most likely has to do with our old pal Jim Cramer. Cramer made a pretty compelling pitch for Chart in his "Speculation Friday" segment at the end of last week. He pointed out that there are a bunch of new liquid natural gas facilities being built around the world and there is a push -- particularly in China -- to increase natural gas usage. This all adds up to more potential demand for the equipment that Chart makes.

Now what: Whether it's your Uncle Ted, Jim Cramer, or Warren Buffett giving you the idea, it's never a good idea to blindly jump on a stock because of a hot tip. Chart is well-positioned within its industry and has established relationships with many key players from Praxair (NYSE: PX) on the industrial gases side, to Jacobs Engineering (NYSE: JEC) in construction and ExxonMobil (NYSE: XOM) (among many others) in the natural gas field. That said, the stock has been soaring lately, is trading at a pricey multiple of expected 2011 earnings, and was referred to by Cramer as a speculation. There may be good reason for investors to be eyeing Chart, but they'd be well advised to dig in and do some of their own research before jumping in.

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