Shares of Plug Power (NASDAQ: PLUG) plummeted 20% in early trading on Wednesday and were still trading 15% lower as of 1:30 p.m. ET. The hydrogen stock has now dropped 45% in just one month, as of the time of this writing.

One of the biggest concerns appears to have come back to haunt Plug Power investors: liquidity and financial stability.

Image source: Getty Images.

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Source Fool.com