Plug Power, Inc. (NASDAQ:PLUG) shares are trading lower Thursday, and multiple analysts have updated their coverage of Plug Power stock. Here’s a look at what’s going on. The Details: UBS analyst Manav Gupta downgraded Plug Power stock from Buy to Neutral and announced a $4.75 price target, and Seaport Global analyst Tom Curran downgraded Plug Power from Buy to Neutral on Tuesday. Redburn Atlantic analystSkye Landon initiated coverage on Plug Power with a Neutral rating and announced a price target of $4.50 as well. Plug announced it has re-started operation of its hydrogen plant in Charleston…

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