X0306 4 2018-06-18 0000310158 Merck & Co., Inc. MRK 0001376841 Schechter Adam H MERCK & CO., INC. 2000 GALLOPING HILL ROAD KENILWORTH NJ 07033 1 EVP & Pres-Global Human Health Common Stock 2018-06-18 4 M 0 100000.0000 36.5600 A 100000.0000 D Common Stock 2018-06-18 4 S 0 100000.0000 61.0016 D 0.0000 D Common Stock 2018-06-18 4 S 0 34094.0000 61.0015 D 62765.9747 I By Trust Stock Option (right to buy) 36.5600 2018-06-18 4 M 0 100000.0000 0.0000 D 2012-05-04 2021-05-03 Common Stock 100000.0000 100000.0000 D The exercise and sale transactions reported in this Form 4 are made pursuant to a Rule 10b5-1 trading plan. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $60.5900 to $61.3200, inclusive. The reporting person undertakes to provide to Merck & Co., Inc., any security holder of Merck & Co., Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth above in this footnote. The sale reported in this Form 4 is made pursuant to a Rule 10b5-1 trading plan. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $60.6100 to $61.3100, inclusive. The reporting person undertakes to provide to Merck & Co., Inc., any security holder of Merck & Co., Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth above in this footnote. Holdings include shares acquired in dividend reinvestment transactions. The option became exercisable in equal installments on 5/4/2012, 5/4/2013 and 5/4/2014. Faye C. Brown as Attorney-in-Fact for Adam H. Schechter 2018-06-19