Analysts’ downgrades for Wednesday, May 17th: Aluminum Co. of China (OTCMKTS:ACHHY) was downgraded by analysts at The Goldman Sachs Group, Inc. from a neutral rating to a sell rating. Baidu (NASDAQ:BIDU) was downgraded by analysts at StockNews.com from a buy rating to a hold rating. ContraFect (NASDAQ:CFRX) was downgraded by analysts at StockNews.com from a […]