Plug Power (NASDAQ: PLUG) stock rocketed more than 10% in early trading Tuesday, hitting $3 per share before giving back most of its gains and retreating to a single-digit gain. As of 10:20 a.m ...

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Its stock was up nearly 3% after a 4% gain Friday. Despite their 11% gains Monday morning—which followed a 13% jump Friday—shares of Plug Power remain about 30% lower over the past year.

Battered shares of hydrogen technology company Plug Power rose Friday after getting a vote of confidence from a major ...