OMNICOM GROUP INC. — Director's Dealing 2008

May 15, 2008

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: OMNICOM GROUP INC (OMC)
CIK: 0000029989
Period of Report: 2008-05-13

Reporting Person: Robertson Andrew (President/CEO BBDO Worldwide)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2008-05-13	Common Stock, par value $0.15 per share	M	10500	$31.18	Acquired	44909	Direct
2008-05-13	Common Stock, par value $0.15 per share	S	10500	$49.50	Disposed	34409	Direct
2008-05-14	Common Stock, par value $0.15 per share	M	9500	$31.18	Acquired	43909	Direct
2008-05-14	Common Stock, par value $0.15 per share	S	9500	$49.50	Disposed	34409	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2008-05-13	Employee Stock Option (right to buy)	$31.18	M	10500	Disposed	2011-10-02	Common Stock (10500)	Direct
2008-05-14	Employee Stock Option (right to buy)	$31.18	M	9500	Disposed	2011-10-02	Common Stock (9500)	Direct

Footnotes

F1: 33.3% of the shares vested on March 21, 2002; and the remaining 66.7% of the shares vested on October 2, 2007.