OMNICOM GROUP INC. — Director's Dealing 2005

Mar 9, 2005

SEC Form 3 — Initial Statement of Beneficial Ownership

Issuer: OMNICOM GROUP INC (OMC)
CIK: 0000029989
Period of Report: 2005-03-01

Reporting Person: Birkin Michael (Vice Chairman of Omnicom Group)

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock, par value $0.15	27853	Direct

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Options to Purchase Common Stock (Right to Buy)	$65.50	2009-02-25	Common Stock (25000)		Direct
Options to Purchase Common Stock (Right to Buy)	$78.31	2010-03-08	Common Stock (50000)		Direct
Options to Purchase Common Stock (Right to Buy)	$79.50	2011-04-04	Common Stock (60000)		Direct
Options to Purchase Common Stock (Right to Buy)	$62.35	2011-10-02	Common Stock (25000)		Direct
Options to Purchase Common Stock (Right to Buy)	$93.55	2012-04-12	Common Stock (60000)		Direct

Footnotes

F1: Includes 25,000 shares of restricted stock that are subject to forfeiture.

F2: The option is fully exercisable.

F3: 8,333 options are exercisable at this time. The remaining options become exercisable on 10/02/2007.

F4: 36,000 options are exercisable at this time. The remaining options become exercisable on 04/12/2005.