Omnicom Group, Inc. is an American marketing and corporate communications holding company, headquartered in New York City. Omnicom's branded networks and numerous specialty firms provide advertising, strategic media planning and buying, digital and interactive marketing, direct and promotional marketing, customer relationship management (CRM), and public relations to more than 5,000 clients in over 100 countries.
Omnicom’s agency networks include BBDO, DDB Worldwide, TBWA Worldwide, Diversified Agency Services (DAS) and Omnicom Media Group (OMG). Its public relations, CRM and specialty communications agencies are managed by its DAS network and include the CRM businesses of Javelin, Proximity Worldwide, Rapp and Targetbase; the PR agency businesses Brodeur Worldwide, Fleishman-Hillard, G+ Europe, Ketchum Inc., Pleon and Porter Novelli and retail/promotional businesses such as Alcone Marketing Group. Omnicom Media Group includes OMD Worldwide, PHD Worldwide and Resolution Media. Omnicom was formed in 1986 from the merger between advertising agency networks DDB, Needham Harper Steers and BBDO.