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.
Resona Holdings Resona Holdings, Inc. (株式会社りそなホールディングス , Kabushiki-gaisha Risona Hōrudingusu ) () is the holding company of Resona Group (りそなグループ , Risona Gurūpu ) , the fifth-largest banking group in Japan as of 2012.