Merck & Co., Inc. — Director's Dealing 2010

May 11, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Merck & Co. Inc. (MRK)
CIK: 0000310158
Period of Report: 2010-05-07

Reporting Person: AMBROSE ADELE D (V-P & Chief Comms Officer)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-05-07	Restricted Stock Unit	$	A	3583	Acquired	2013-05-07	Common Stock (3583)	Direct
2010-05-07	Stock Option (right to buy)	$33.49	A	19208	Acquired	2020-05-06	Common Stock (19208)	Direct

Footnotes

F1: Each restricted stock unit represents a contingent right to receive one share of Merck & Co., Inc. common stock.

F2: The option vests in three equal annual installments beginning May 7, 2011.