Green Plains (NASDAQ:GPRE – Get Free Report) was downgraded by research analysts at Zacks Research from a “hold” rating to a “strong sell” rating in a research report issued on Thursday,Zacks.com reports. Weiss Ratings reaffirmed a “sell (d-)” rating on shares of Green Plains in a research report on Friday, July 17th. Wall Street Zen raised shares of Green Plains from a “buy” rating to a “strong-buy” rating in a research report on Saturday. Get Green Plains alerts:Check Out Our Latest Analysis on GPREGreen Plains Stock Down 3.6%Green Plains stock opened at $14.65 on Thursday. Green Plains News RoundupHere are the key news stories impacting Green Plains this week:About Green Plains(Get Free Report)Green Plains Inc is a leading producer of fuel-grade ethanol and related co-products in the United States.