Merck Upgraded To Buy From Neutral At Citi By: TalkMarkets October 18, 2017 at 07:53 AM EDT The analyst revised his initial PDx market estimates of $35bn to at least $50bn and increased his 2025 Keytruda forecasts from $9B to$15B. Read More >> Related Stocks: Eli Lilly Merck & Co Roche Holding AG Basel American Depositary Shares