Research Analysts’ upgrades for Monday, May 30th: AudioCodes (NASDAQ:AUDC) was upgraded by analysts at StockNews.com from a buy rating to a strong-buy rating. BGC Partners (NASDAQ:BGCP) was upgraded by analysts at StockNews.com from a hold rating to a buy rating. Compugen (NASDAQ:CGEN) was upgraded by analysts at StockNews.com from a sell rating to a hold […]