American global investment is headquartered in what city?
Principal Financial Group The Principal Financial Group is a global financial investment management leader headquartered in Des Moines, Iowa.
Nielsen Corporation The Nielsen Corporation, self-referentially known as The Nielsen Company, and formerly known as ACNielsen or AC Nielsen, is a global marketing research firm, with worldwide headquarters in New York City, United States. Regional headquarters for North America are located in the Chicago suburb of Schaumburg, Illinois. As of May 2010, it is part of Nielsen Holdings.