Exor Group (Exor Group) is the largest investment company in Italy and Europe, based in Italy and currently controlled by the Agnelli family. two holding companies under Exor Holdings were merged in 2008, so Exor Holdings has a major controlling interest in the Fiat Group. The company also has control over Fiat Group businesses such as Cushman & Wakefield Property Advisors, a U.S. real estate services company.