Research Analysts’ downgrades for Monday, June 6th: Appen (OTCMKTS:APPEF) was downgraded by analysts at Citigroup Inc. to a hold rating. Citigroup Inc. currently has $6.60 price target on the stock. Assertio (NASDAQ:ASRT) was downgraded by analysts at StockNews.com from a strong-buy rating to a buy rating. AVEVA Group (OTCMKTS:AVEVF) was downgraded by analysts at Citigroup […]