Research Analysts’ upgrades for Wednesday, August 21st: Albireo Pharma (NASDAQ:ALBO) was upgraded by analysts at BidaskClub from a strong sell rating to a sell rating. Arena Pharmaceuticals (NASDAQ:ARNA) was upgraded by analysts at BidaskClub from a hold rating to a buy rating. Artesian Resources (NASDAQ:ARTNA) was upgraded by analysts at BidaskClub from a sell rating […]