 Five African billionaires Forbes missed in its list. Five. Mary Oppenheimer's slack net worth 8.5 billion US dollars. Nationality, South Africa, Source, Mining, Inheritance. Four. Benedict Peters net worth 2.7 billion US dollars. Nationality, Manchuria, Source, Oil, Mining. Three. Femi-Otodola. Net worth 1.85 billion US dollars. Nationality, Manchuria, Source, Power Generation. Two. Rostem Aziz net worth 1.1 billion US dollars. Nationality, Tanzania, Source, Telecom. One. Tomi Elumeleu net worth 1.4 billion US dollars. Nationality, South Africa, Source, Banking, Real Estate.