4) Mohammed Al Issa – Net Worth: $3.7 Billion

This 89-year-old self-made billionaire is one of the largest individual investors in the Saudi stock market. He has major stakes in Savola Group, one of the largest food processors in Saudi Arabia. He also holds major stakes in Riyad Bank and Saudi Hotels & Resorts Co. SEE ALSO: Top 5 richest football leagues in the world 2015