Benzinga's Top Upgrades, Downgrades For May 30, 2017 By: Benzinga via Benzinga May 30, 2017 at 09:31 AM EDT Top Upgrades Analysts at Piper Jaffray upgraded Zynga Inc (NASDAQ: ZNGA) from Neutral to Overweight. Zynga shares gained 2.3 ... Read More >> Related Stocks: Ambarella Inc Antero Midstream Gp LP AutoZone Biohaven Ltd Caleres Inc Dxc Technology Company First Bank Hub Group Inc A KKR Real Estate Finance Trust Inc Keysight Technologies Inc Macerich Co Newfield Exploration Ovid Therapeutics Inc Pieris Pharmaceuticals Inc Rapid7 Inc Symantec Corp Teck Cominco Limited Tesla, Inc. Tesoro Petroleum Co Urogen Pharma Ltd Valero Energy Zynga Inc Cl A