It is the single largest donation to a philanthropic cause made by a Nigerian businessman.
As the “Queen of Talk,” Winfrey has built a thriving media empire that includes Harpo Productions.
Shares in the group rose 35.56 percent as a result.
Smith directs Vista's investment strategy.
Datatec is a South African ICT services provider.
Mwangi's 3.38-percent stake has now risen in value to $51.71 million.
Kotecha has been charged alongside his father, Midland Hauliers Director Javesh Kumar Prabhudar Kotecha.
Chimphondah is known for his successful business turnarounds.
Kimani owns 32.3 percent of the company, or 6,330,699 shares.
Mbire owns 3.98 percent of the company.
Oppenheimer remains one of Africa's richest billionaires and South Africa's second wealthiest person.