The Interpublic Group portfolio historically encompassed numerous world-renowned advertising, media, and public relations agencies. Prominent networks and specialized firms included McCann Worldgroup, FCB, MullenLowe Group, IPG Mediabrands, Initiative, UM, Weber Shandwick, Golin, and Jack Morton Worldwide. These agencies serviced thousands of global corporate clients across automotive, retail, financial services, and entertainment sectors before being integrated into Omnicom.