Merck & Co., Inc. (NYSE:MRK) is included among the 10 Cash-Rich Dividend Stocks to Buy Right Now. How Merck & Co. (MRK) Turns Robust Free Cash Flow Into Shareholder Value Merck & Co., Inc. (NYSE:MRK) is an American multinational pharmaceutical company. Concerns are growing, however, as its top-selling cancer drug, Keytruda, starts losing patent protections in 2028. Since Keytruda is approximately half of Merck’s revenue, this is a potential risk. To mitigate said risks, Merck & Co., Inc. (NYSE:MRK) is d ...