OMNICOM GROUP INC. — Director's Dealing 2004

Dec 4, 2004

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: OMNICOM GROUP INC (OMC)
CIK: 0000029989
Period of Report: 2004-12-02

Reporting Person: KAESS KEN (President/CEO DDB Worldwide)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2004-12-02	Common Stock, Par Value $0.15	M	25000	$62.35	Acquired	69183	Direct
2004-12-02	Common Stock, Par Value $0.15	S	21500	$82.45	Disposed	47683	Direct
2004-12-02	Common Stock, Par Value $0.15	S	2800	$82.47	Disposed	44883	Direct
2004-12-02	Common Stock, Par Value $0.15	S	400	$82.49	Disposed	44483	Direct
2004-12-02	Common Stock, Par Value $0.15	S	200	$82.48	Disposed	44283	Direct
2004-12-02	Common Stock, Par Value $0.15	S	100	$82.46	Disposed	44183	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2004-12-02	Options to purchase Common Stock (Right to Buy)	$62.35	M	25000	Disposed	2011-10-02	Common Stock (25000)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock, Par Value $0.15	363.341	Indirect

Footnotes

F1: Options become exercisable after six years, but may vest earlier upon the attainment of certain share price threshholds;
55,556 shares were exercisable prior to the transaction listed above.