Ingvar Kamprad (net worth: $40.5 billion)

Swedish business magnate, Ingvar Kamprad controls Ikea, the world’s largest furniture retailer, through a series of trusts and foundations. The closely held company is based in Almhult, Sweden and had 328 stores worldwide with more than 9,500 products, 771 million store visits, and a revenue of $37 billion in the year ended Aug. 31, 2015.