Omnicom Group Inc. is an American multinational media, marketing, and corporate communications holding company headquartered in New York City. Its branded networks and specialty firms provide services in four disciplines: advertising, customer relationship management, public relations, and specialty services. The services included in these disciplines are media planning and buying, digital and interactive marketing, sports and events marketing, field marketing, and brand consultancy. Omnicom Group serves as the parent company of Omnicom Media Group, comprising the agencies OMD, PHD, and Hearts & Science, as well as the global advertising agency networks BBDO, DDB, and TBWA. Omnicom Group also manages Flywheel, DAS Group of Companies, and the Communications Consultancy Network. In 2014, Omnicom was considered the second largest advertising holding company by The Wall Street Journal. As of 2024, the company employs around 74,900 employees globally.