Plug Power (NASDAQ: PLUG) shares fell as much as 7.5% to start the week. Shareholders have an analyst report to thank for that. As of 2:15 p.m. ET, the stock was still trading lower by 6%. 

Morgan Stanley analyst Andrew Percoco didn't suggest investors sell Plug Power stock in his latest report shared by Barron's today. His firm only changed its rating on the hydrogen fuel cell company's stock to the equivalent of a hold from a previous buy rating. But the price target cut was substantial enough for investors to take notice today and accelerate the drop the stock has experienced in the past month.  

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Source Fool.com