Why Plug Power Stock Popped After FuelCell's Earnings

Shares of hydrogen fuel cell company Plug Power (NASDAQ: PLUG) powered higher in Friday trading, ultimately closing the day up 5%. After all, Marketwatch headlined this morning with a story on how CEO Andrew Marsh just made more than $36 million buying Plug Power stock for about 1/25th of its market value by exercising stock options -- then turned around and sold those shares the very same day. Investors didn't follow the CEO's example, however, and one reason may be the earnings that rival FuelCell Energy (NASDAQ: FCEL) reported before the bell Thursday.