15. Folorunso Alakija | Net Worth: $1 Billion
The 69-year-old businesswoman, Folorunso Alakija is the vice-chairperson of a Nigerian oil exploration company, Famfa Oil. She also has stakes in a prolific offshore asset in Agbami Oilfield.
Her first company was a fashion label whose customer was the wife of former Nigerian president, Ibrahim Babangida. Her company has been awarded an oil prospecting license in 1993 by the Nigerian government. Later, it was converted to an oil mining lease. The Agbami field is operating since 2008 and Famfa Oil might be operated through 2024.