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 liquid gas specialist Chart Industries (Nasdaq: GTLS) leapt as much as 13% in intraday trading today on heavier-than-average volume.

So what: It appears today's excitement may have been driven by a bullish analyst note from Piper Jaffray. The Wall Street firm said the nuclear problems in Japan will likely boost the country's imports of liquid natural gas as it tries to make up for lost power-generation capacity. Jaffray has an "overweight" rating on Chart and a $57 price target.

Now what: Investors have been loving Chart Industries' stock lately; it's up 250% from its 52-week low. The Piper Jaffray note does highlight an important point about the issues in Japan, and it's certainly possible Chart could benefit from the need for non-nuclear power in the country. However, investors should be sure to do their own research, rather than simply chasing the stock based on someone else's work.

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Fool contributor Matt Koppenheffer does not own shares of any of the companies mentioned. You can check out what Matt is keeping an eye on by visiting his CAPS portfolio, or you can follow Matt on Twitter @KoppTheFool or on his RSS feed. The Fool's disclosure policy prefers dividends over a sharp stick in the eye.