X0303 4 2010-02-26 0 0000310158 Merck & Co. Inc. (MRK) 0001238302 KOHAN RAUL E ONE MERCK DRIVE P.O. BOX 100 WHITEHOUSE STATION NJ 08889-0100 0 1 0 0 ExecVP&PresAnimalHlth Common Stock 2010-02-26 4 M 0 27000 19.56 A 114266 D Common Stock 2010-02-26 4 S 0 27000 37.00 D 87266 D Common Stock 2010-03-01 4 M 0 4484 19.56 A 91750 D Common Stock 2010-03-01 4 S 0 4484 37.36 D 87266 D Common Stock 2010-03-01 4 M 0 22449 19.56 A 109715 D Common Stock 2010-03-01 4 S 0 22449 37.36 D 87266 D Common Stock - 401(k) Plan 3298 I By 401(k) Employee Stock Option 2003/02/24 (right to buy) 19.56 2010-02-26 4 M 0 27000 0.00 D 2004-02-24 2013-02-23 Common Stock 27000 4484 D Employee Stock Option 2003/02/24 (right to buy) 19.56 2010-03-01 4 M 0 4484 0.00 D 2004-02-24 2013-02-23 Common Stock 4484 0 D Employee Stock Option 2003/02/24 (right to buy) 19.56 2010-03-01 4 M 0 22449 0.00 D 2004-02-24 2013-02-23 Common Stock 22449 0 D Includes shares acquired and dividends earned through August 31, 2009 in the Schering-Plough Employees Savings, a 401(k) Plan. Debra A. Bollwage as Attorney-in-Fact for Raul E. Kohan 2010-03-01