Today, we look at three extraordinary stocks that have investors bewildered by incredible surges in share prices as well as off-the-charts volatility. Shares of Plug Power (PLUG -4.54%), a manufacturer of fuel-cell systems, have appreciated 3,200% over the past year. With such a rapid rise and heavy media coverage, investors are wondering if the business fundamentals warrant such price appreciation, or are we in a fuel cell bubble? The exuberance and volatility are not exclusive to Plug Power; FuelCell Energy (FCEL -4.30%) and Ballard Power Stations (BLDP -1.52%) are also along for the ride. Today, we answer a question from a Foolish reader wondering, "How do you identify a bubble"?
Here is a winner to buy and hold
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This segment is from Tuesday's edition of "Digging for Value," in which sector analysts Joel South and Taylor Muckerman discuss energy and materials news with host Alison Southwick. The twice-weekly show can be viewed on Tuesdays and Thursdays. It can also be found on Twitter, along with our extended coverage of the energy and materials sectors: @TMFEnergy..