Omnicom Group, Inc. is an American marketing and corporate communications holding company, headquartered in New York City. Omnicom's branded networks and specialty firms provide various services in advertising and public relations, including strategic media planning and buying, digital and interactive marketing, direct and promotional marketing, and customer relationship management (CRM).

Omnicom Group, Inc. is an American marketing and corporate communications holding company, headquartered in New York City. Omnicom's branded networks and specialty firms provide various services in advertising and public relations, including strategic media planning and buying, digital and interactive marketing, direct and promotional marketing, and customer relationship management (CRM).