X0306 4 2015-02-09 0000310158 Merck & Co., Inc. MRK 0001032635 WENDELL PETER C SIERRA VENTURES 1400 FASHION ISLAND BLVD. - SUITE 1010 SAN MATEO CA 94404 1 Common Stock 2015-02-09 4 M 0 5000.0000 33.8300 A 6000.0000 D Common Stock 2015-02-09 4 S 0 5000.0000 58.7594 D 1000.0000 D Stock Option (right to buy) 33.8300 2015-02-09 4 M 0 5000.0000 0.0000 D 2006-04-29 2015-04-28 Common Stock 5000.0000 0.0000 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $58.7200 to $58.8500 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 option became exercisable in equal installments on 4/29/2006, 4/29/2007 and 4/29/2008. Katie Fedosz as Attorney-in-Fact for Peter C. Wendell 2015-02-09