Top Analyst Upgrades and Downgrades: Alkermes, ArQule, Bluebird Bio, Cognizant, Ecolab, KLA-Tencor, Pandora, Verisk, Vonage and More
The top analyst upgrades, downgrades and other research calls from Thursday include Alkermes, ArQule, Bluebird Bio, Cognizant Technology Solutions, Ecolab, KLA-Tencor, Pandora Media, Verisk Analytics and Vonage.