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There are 24 African billionaires this year, down from 28 in 2015. And according to Forbes, Nigerian businessman Mike Adenuga is the biggest gainer among the African billionaires. He is now worth $10 billion, up from $4 billion a year ago.

The significant jump in Adenuga’s fortune according to Forbes is attributable to new information on the value of his telecom, oil and real estate holdings. Angolan investor Isabel dos Santos and oil tycoon Folorunsho Alakija of Nigeria still remain the only two female billionaires on the continent.

See the top richest people in Africa.

Aliko Dangote, Nigerian
Net Worth: $14.4 billion
Source Of Wealth: Cement, flour, sugar, salt

Mike Adenuga, Nigerian
Net Worth: $10 billion
Source Of Wealth: Telecom, Oil, Real Estate

Nicky Oppenheimer, South African
Net Worth: $6.6 billion
Source Of Wealth: Diamonds

Christoffel Wiese, South African
Net Worth: $6.2 billion
Source Of Wealth: Retailing

Johann Rupert, South African
Net Worth: $5.3 billion
Source Of Wealth: Luxury Goods

Nassef Sawiris, Egyptian
Net Worth: $4.1 billion
Source Of Wealth: Construction, Chemicals

Nathan Kirsch, Swazi
Net Worth: $3.7 billion
Source Of Wealth: Retail

Isabel dos Santos, Angolan
Net Worth: $3.1 billion
Source Of Wealth: Investments

Issad Rebrab, Algerian
Net Worth: $3.1 billion
Source of Wealth: Food

Naguib Sawiris, Egyptian
Net Worth: $3 billion
Source Of Wealth: Telecom

Mohammed Mansour, Egyptian
Net Worth: $2.5 billion
Source Of Wealth: Diversified

Othman Benjelloun, Moroccan
Net Worth: $1.9 billion
Source Of Wealth: Banking, Insurance

Mohamed Al Fayed, Egyptian
Net Worth: $1.9 billion
Source Of Wealth: Retailing

Femi Otedola, Nigerian
Net Worth: $1.85 billion

Youssef Mansour, Egyptian

Net Worth: $1.73 billion

Source: Diversified

Folorunsho Alakija, Nigerian
Net Worth: $1.55 billion
Source Of Wealth: Oil

Allan Gray, South African
Net Worth: $1.49 billion
Source Of Wealth: Money Management

Koos Bekker, South African
Net Worth: $1.47 billion
Source Of Wealth: Media, Investments

Yasseen Mansour, Egyptian
Net Worth: $1.39 billion
Source Of Wealth: Diversified

20. Aziz Akhannouch, Moroccan
Net Worth: $1.25 billion
Source Of Wealth: Petroleum, Diversified

Patrice Motsepe, South African
Net Worth: $1.15 billion
Source Of Wealth: Mining

Abdulsamad Rabiu, Nigerian
Net Worth: $1.1 billion
Source Of Wealth: Diversified

Onsi Sawiris, Egyptian
Net Worth: $1.09 billion
Source Of Wealth: Construction, Telecom

24. Mohammed Dewji, Tanzanian
Net Worth: $1.09 billion
Source Of Wealth: Diversified