Publicis is holding company. Through its subsidiaries, Co. is engaged in marketing, communication and digital transformation. Co. designs a customized package of services to meet each client's particular needs through a holistic and global approach. In addition, Co. provides financial markets with information concerning the relative size of each of the different business sectors for the sole purpose of allowing sector comparisons. Co.'s principal activities comprise four main categories: Digital, Advertising, Specialized Agencies and Marketing Services (SAMS) and Media.

WPP is a holding company. Through its subsidiaries, Co. is a communications services organization providing national and multinational clients a range of communications services. Co. is organized into four operating segments: Advertising and Media Investment Management; Data Investment Management; Public Relations and Public Affairs; and Branding and Identity, Healthcare and Specialist Communications. This last reportable segment includes WPP Digital and direct, digital, promotional & relationship marketing.