Stocks making the biggest moves premarket: Vroom, Poshmark, Revolve, Green Plains and more - CNBC

These are the stocks posting the largest moves in premarket trading.

Check out the companies making headlines before the bell: Poshmark Shares spiked more than 5% after Barclays upgraded the online fashion retailer to overweight from equal weight. Poshmark will get a… [+1699 chars]

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