5. Abdul Samad Rabiu | Net Worth: $3.1 Billion
The 59-year-old Abdul Samad Rabiu is the founder of BUA Group which is a Nigerian conglomerate active in cement production, real estate, and sugar refining.
He merged his privately owned Cement Company with the top farm, Cement Co. of Northern Nigeria that he controlled. The merged firm, BUA Cement Plc trades on the Nigerian stock exchange and he owns 98.5% of it. In 1988, he set up his own business in importing steel, iron, and chemicals.