9. Charles Koch:
Charles De Ganahl Koch is an American business tycoon and philanthropist. He is the co-owner, chairman and CEO of Koch industries. The conglomerate originally involved in oil refining and chemicals but now have polymers and fibre, minerals, fertilizers, ranching and pollution control equipment. Koch Industries is the second largest privately owned conglomerate by revenue in the US. His net worth is estimated to be US$48 billion derived from his 42% stakes in Koch Industries.