Green Plains (NASDAQ:GPRE – Get Free Report) was downgraded by investment analysts at Zacks Research from a “hold” rating to a “strong sell” rating in a report released on Thursday,Zacks.com reports. Wall Street Zen upgraded shares of Green Plains from a “buy” rating to a “strong-buy” rating in a research report on Saturday. Get Green Plains alerts:Read Our Latest Analysis on GPREGreen Plains Trading Down 3.6%GPRE opened at $14.65 on Thursday. More Green Plains NewsHere are the key news stories impacting Green Plains this week:Green Plains Company Profile(Get Free Report)Green Plains Inc is a leading producer of fuel-grade ethanol and related co-products in the United States. Featured ArticlesReceive News & Ratings for Green Plains Daily - Enter your email address below to receive a concise daily summary of the latest news and analysts' ratings for Green Plains and related companies with MarketBeat.com's FREE daily email newsletter.