Favorable News On Keytruda Drives Piper Jaffray's Upgrade Of Merck By: Benzinga via Benzinga January 12, 2017 at 10:11 AM EST After the close on Wednesday, Merck & Co., Inc. (NYSE: MRK) announced that the FDA had accepted its filing for Keytruda based on the ... Read More >> Related Stocks: Merck & Co