Boosted By Keytruda, Citi Upgrades Merck To Buy For The First Time Ever By: Benzinga via Benzinga October 18, 2017 at 09:07 AM EDT Analysts at Citi hold a bullish rating on Merck & Co., Inc. (NYSE: MRK). The firm's Andrew Baum upgraded Merck's stock from ... Read More >> Related Stocks: Astrazeneca Plc ADR Bristol-Myers Squibb Eli Lilly Merck & Co