Seplat Energy is an independent oil and gas company.
Datatec is a South African ICT services provider.
Chimphondah is known for his successful business turnarounds.
Oppenheimer remains one of Africa's richest billionaires and South Africa's second wealthiest person.
Rupert's investment firm, Remgro, owns 44.6 percent of Mediclinic, South Africa's largest hospital operator.
Rabiu and his son own 99.8 percent of the newly established food business.
The majority of Rupert's fortune stems from his stake in Richemont.
The Mauritian Lagesse family and the Dalais family both control a portion of Alteo Limited through related entities.
The Nigerian-Lebanese telecom tycoon is listing his 208-foot yacht, "Bash," for sale.
Gibson owns 35.6 percent of the company.