Equities Research Analysts’ upgrades for Saturday, December 23rd: Builders FirstSource (NYSE:BLDR) was upgraded by analysts at StockNews.com from a hold rating to a buy rating. Amdocs (NASDAQ:DOX) was upgraded by analysts at StockNews.com from a buy rating to a strong-buy rating. EnerSys (NYSE:ENS) was upgraded by analysts at StockNews.com from a buy rating to a […]