Of what nationality are both Dentsply Sirona and Omnicom Group?
Omnicom Group Omnicom Group, Inc. is an American global marketing and corporate communications holding company, headquartered in New York City.
SEA Group SEA Group ("Italian – Societa' Europea Autocaravan; pronounced "sayer"") is an Italian headquartered motorcaravan manufacturer, based in Trivolzio, Lombardy.