Plug Power (NASDAQ: PLUG) sent shockwaves among investors some months ago when it issued a "going concern" warning. Management has tried hard to pacify investors since, and some of the updates it provided in late January even sent the hydrogen stock surging more than 40% in the last week of the month.

All eyes have been on Plug Power's earnings report since, with investors hoping for some more good news. The company seems to have succeeded, or so it seems from the way Plug Power stock made a U-turn on Friday, jumping into the green as the day progressed after slumping more than 10% at one point in early-morning trading.

Is this a sign to buy Plug Power stock?

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Source Fool.com