 Top 5 richest companies in Africa and their estimated net worth. 5. Angle American, South Africa. Net worth $13.6 billion. 4. MTN Group, South Africa. Net worth $14.2 billion. 3. Firstrand, South Africa. Net worth $15.8 billion. 2. Ferricom, Kenya. Net worth $18.3 billion. 1. NASPERS, South Africa. Net worth $133.7 billion.