X0303 4 2009-11-19 0000310158 Merck & Co. Inc. MRK 0001475384 Bowles Richard S III ONE MERCK DRIVE WHITEHOUSE STATION NJ 08889-0100 1 Exe V-P & Chief Compl Officer Common Stock 2009-11-19 4 A 0 11004 0 A 60859 D Common Stock 252 I As Custodian Common Stock - 401(k) Plan 3377.3284 I By 401(k) The acquisition of the shares was subject to the achievement of performance goals approved by the Compensation Committee of the Issuer. The shares will become payable on December 31, 2011 provided that the reporting person remains continuously employed by the Issuer through that date, or, if sooner, upon the reporting person's involuntary termination of employment other than for cause. Includes shares acquired and dividends earned through October 1, 2009 in the Merck & Co., Inc. Employee Savings and Security Plan, a 401(k) plan. Debra A. Bollwage as Attorney-in-Fact for Richard S. Bowles, III 2009-11-23