OMNICOM GROUP INC. — Director's Dealing 2008

Sep 26, 2008

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: OMNICOM GROUP INC (OMC)
CIK: 0000029989
Period of Report: 2008-09-24

Reporting Person: WEISENBURGER RANDALL J (Executive Vice President & CFO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2008-09-24	Common Stock, par value $0.15 per share	M	105504	$19.875	Acquired	508308	Direct
2008-09-24	Common Stock, par value $0.15 per share	S	1100	$38.89	Disposed	507208	Direct
2008-09-24	Common Stock, par value $0.15 per share	S	1500	$38.9	Disposed	505708	Direct
2008-09-24	Common Stock, par value $0.15 per share	S	900	$38.91	Disposed	504808	Direct
2008-09-24	Common Stock, par value $0.15 per share	S	200	$38.93	Disposed	504608	Direct
2008-09-24	Common Stock, par value $0.15 per share	S	300	$38.94	Disposed	504308	Direct
2008-09-24	Common Stock, par value $0.15 per share	S	9400	$38.95	Disposed	494908	Direct
2008-09-24	Common Stock, par value $0.15 per share	S	1700	$38.97	Disposed	493208	Direct
2008-09-24	Common Stock, par value $0.15 per share	S	8000	$38.98	Disposed	485208	Direct
2008-09-24	Common Stock, par value $0.15 per share	S	2500	$38.99	Disposed	482708	Direct
2008-09-24	Common Stock, par value $0.15 per share	S	4000	$39	Disposed	478708	Direct
2008-09-24	Common Stock, par value $0.15 per share	S	6100	$39.01	Disposed	472608	Direct
2008-09-24	Common Stock, par value $0.15 per share	S	2400	$39.02	Disposed	470208	Direct
2008-09-24	Common Stock, par value $0.15 per share	S	3300	$39.03	Disposed	466908	Direct
2008-09-24	Common Stock, par value $0.15 per share	S	1800	$39.04	Disposed	465108	Direct
2008-09-24	Common Stock, par value $0.15 per share	S	3900	$39.06	Disposed	461208	Direct
2008-09-24	Common Stock, par value $0.15 per share	S	5000	$39.07	Disposed	456208	Direct
2008-09-24	Common Stock, par value $0.15 per share	S	1200	$39.08	Disposed	455008	Direct
2008-09-24	Common Stock, par value $0.15 per share	S	1500	$39.10	Disposed	453508	Direct
2008-09-24	Common Stock, par value $0.15 per share	S	700	$39.14	Disposed	452808	Direct
2008-09-24	Common Stock, par value $0.15 per share	S	1100	$39.15	Disposed	451708	Direct
2008-09-24	Common Stock, par value $0.15 per share	S	4600	$39.16	Disposed	447108	Direct
2008-09-24	Common Stock, par value $0.15 per share	S	1600	$39.17	Disposed	445508	Direct
2008-09-24	Common Stock, par value $0.15 per share	S	2500	$39.18	Disposed	443008	Direct
2008-09-24	Common Stock, par value $0.15 per share	S	2400	$39.19	Disposed	440608	Direct
2008-09-24	Common Stock, par value $0.15 per share	S	6400	$39.2	Disposed	434208	Direct
2008-09-24	Common Stock, par value $0.15 per share	S	6500	$39.21	Disposed	427708	Direct
2008-09-24	Common Stock, par value $0.15 per share	S	2300	$39.22	Disposed	425408	Direct
2008-09-24	Common Stock, par value $0.15 per share	S	300	$39.23	Disposed	425108	Direct
2008-09-24	Common Stock, par value $0.15 per share	S	100	$39.24	Disposed	425008	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2008-09-24	Employee Stock Option (right to buy)	$19.875	M	105504	Disposed	2008-10-09	Common Stock (105504)	Direct
2008-09-25	Employee Stock Option (right to buy)	$19.875	M	44496	Disposed	2008-10-09	Common Stock (44496)	Direct

Footnotes

F1: This is the first of two Forms 4 filed on September 26, 2008, to report two option exercises and associated sales because
all sales will not fit on one Form.

F2: This includes 6,204 shares acquired under Omnicom's employee stock purchase plan.

F3: 30% of the shares vested on October 9, 1999; 30% of the shares vested on October 9, 2000; and the remaining 40% of the shares
vested on October 9, 2001.