Benzinga's Top Upgrades, Downgrades For March 23, 2017 By: Benzinga via Benzinga March 23, 2017 at 09:37 AM EDT Top Upgrades Stifel Nicolaus upgraded Varonis Systems Inc (NASDAQ: VRNS) from Hold to Buy. Varonis Systems shares rose 0.89 ... Read More >> Related Stocks: Altria Group Cabot Oil & Gas Centene Corp Chesapeake Energy Darling International Inc Dollar General EnCana Corporation Energen Corp FMC Corp Fireeye Inc Kroger Co Norfolk Southern Proofpoint Inc Southwestern Energy Ultragenyx Pharmaceu Varonis Systems Inc