Benzinga's Top Upgrades By: Benzinga via Benzinga July 27, 2015 at 09:02 AM EDT SunTrust Robinson Humphrey upgraded Chesapeake Energy Corporation (NYSE: CHK) from Neutral to Buy. The price target for Chesapeake ... Read More >> Related Stocks: Chesapeake Energy Cigna Corp Deere & Co Flotek Industries Popular Inc Qualcomm, Inc. Quality Systems Inc Stratasys Ltd Ventas Inc Weatherford International Ltd