OMNICOM GROUP INC. — Director's Dealing 2005

May 17, 2005

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: OMNICOM GROUP INC (OMC)
CIK: 0000029989
Period of Report: 2005-05-16

Reporting Person: COOK ERROL M (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2005-05-16	Common Stock, Par Value $0.15	P	500	$82.54	Acquired	4716.32	Direct