Interpublic Group is a US advertising and marketing holding company, with agencies such as McCann, FCB and MullenLowe, providing advertising, media, PR and digital marketing services.
WPP is a British multinational communications, advertising and public relations holding company, one of the world's largest, with agencies including Ogilvy, GroupM and Wunderman Thompson.
Omnicom Group is a US multinational advertising and marketing holding company, with agencies including BBDO, DDB and TBWA, providing advertising, media, public relations and data services.
Havas is a global communications group, headquartered in France, offering creative, media and health communications services through integrated Havas Villages in many countries.
Publicis Groupe is a French multinational communications group, one of the world's largest advertising and marketing holding companies, offering creative, media and digital transformation services.
Dentsu is a Japanese multinational advertising and public relations holding company, one of the largest in the world, offering creative, media and customer experience management services.
Hakuhodo is a Japanese advertising and marketing communications company, one of the country's largest, offering creative, media and integrated marketing services to global and local clients.