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: Birkin Michael (Vice Chairman)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2008-05-13	Common Stock, par value $0.15 per share	S	160	$48.85	Disposed	74262	Direct
2008-05-13	Common Stock, par value $0.15 per share	S	100	$48.86	Disposed	74162	Direct
2008-05-13	Common Stock, par value $0.15 per share	S	1100	$48.87	Disposed	73062	Direct
2008-05-13	Common Stock, par value $0.15 per share	S	400	$48.88	Disposed	72662	Direct
2008-05-13	Common Stock, par value $0.15 per share	S	200	$48.89	Disposed	72462	Direct
2008-05-13	Common Stock, par value $0.15 per share	S	4500	$48.92	Disposed	67962	Direct
2008-05-13	Common Stock, par value $0.15 per share	M	50000	$32.75	Acquired	117962	Direct
2008-05-13	Common Stock, par value $0.15 per share	S	8917	$48.80	Disposed	109045	Direct
2008-05-13	Common Stock, par value $0.15 per share	S	900	$48.81	Disposed	108145	Direct
2008-05-13	Common Stock, par value $0.15 per share	S	8300	$48.82	Disposed	99845	Direct
2008-05-13	Common Stock, par value $0.15 per share	S	1600	$48.83	Disposed	98245	Direct
2008-05-13	Common Stock, par value $0.15 per share	S	2800	$48.84	Disposed	95445	Direct
2008-05-13	Common Stock, par value $0.15 per share	S	1300	$48.85	Disposed	94145	Direct
2008-05-13	Common Stock, par value $0.15 per share	S	2600	$48.86	Disposed	91545	Direct
2008-05-13	Common Stock, par value $0.15 per share	S	7976	$48.87	Disposed	83569	Direct
2008-05-13	Common Stock, par value $0.15 per share	S	1900	$48.88	Disposed	81669	Direct
2008-05-13	Common Stock, par value $0.15 per share	S	1158	$48.89	Disposed	80511	Direct
2008-05-13	Common Stock, par value $0.15 per share	S	300	$48.90	Disposed	80211	Direct
2008-05-13	Common Stock, par value $0.15 per share	S	449	$48.91	Disposed	79762	Direct
2008-05-13	Common Stock, par value $0.15 per share	S	100	$48.92	Disposed	79662	Direct
2008-05-13	Common Stock, par value $0.15 per share	S	3000	$49.00	Disposed	76662	Direct
2008-05-13	Common Stock, par value $0.15 per share	S	300	$49.02	Disposed	76362	Direct
2008-05-13	Common Stock, par value $0.15 per share	S	300	$49.03	Disposed	76062	Direct
2008-05-13	Common Stock, par value $0.15 per share	S	600	$49.07	Disposed	75462	Direct
2008-05-13	Common Stock, par value $0.15 per share	S	200	$49.10	Disposed	75262	Direct
2008-05-13	Common Stock, par value $0.15 per share	S	1000	$49.12	Disposed	74262	Direct
2008-05-13	Common Stock, par value $0.15 per share	S	200	$49.13	Disposed	74062	Direct
2008-05-13	Common Stock, par value $0.15 per share	S	1000	$49.17	Disposed	73062	Direct
2008-05-13	Common Stock, par value $0.15 per share	S	200	$49.18	Disposed	72862	Direct
2008-05-13	Common Stock, par value $0.15 per share	S	2700	$49.19	Disposed	70162	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2008-05-13	Employee Stock Option (right to buy)	$32.75	M	50000	Disposed	2009-02-25	Common Stock (50000)	Direct

Footnotes

F1: This is the first of two Forms 4 filed on May 15, 2008, to report six sales and an option exercise and associated sales
because all sales will not fit on one Form 4.

F2: This includes 5,458 shares acquired under Omnicom's employee stock purchase plan.

F3: 30% of the shares vested on February 25, 2000; 30% of the shares vested on February 25, 2001; and the remaining 40% of the
shares vested on February 25, 2002.