Formed in 1986, Omnicom Group Inc. is an American global media, marketing, and corporate communications holding company, headquartered in New York City. As of 2024, the company employs around 74,900 employees globally.

Omnicom's branded networks and specialty firms provide services in four disciplines: advertising, customer relationship management (CRM), 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 is composed of five major agency networks that oversee 1500+ agencies as parent companies. The networks are BBDO Worldwide, one of the companies present from the initial merger, which is a creative agency that has been recognized as one of the most creative networks in the world; Diversified Agency Services (DAS) comprises more than 200 companies focused on public relations, CRM, healthcare, events, promotional marketing, vehicle testing, branding and research; DDB Worldwide, one of the three initial companies, is a global advertising network; Omnicom Media Group (OMG), a media division of the Omnicom Group Inc and TBWA Worldwide, a global agency network, normally billed as 'The Disruption Company'. Omnicom Group also manages Flywheel and the Communications Consultancy Network.

According to en.wikipedia