Nassef Sawiris owns 28.97 percent of the multinational construction group, or 33,825,323 shares.
Motsepe is a member of the WEF Board of Trustees.
Duale said the awards highlight the company's socioeconomic development work.
Kimani owns a 32.3-percent stake in Kenyan agricultural company.
Its total investment in the country is now $148.4 million.
Since 2000, millions of African children have benefited from better access to education.
Rupert's net worth fell by $896 million as a result of the 14 percent drop in Richemont shares on Friday.
Motsepe's net worth has risen to $3.1 billion so far this year.
Among them are Zimbabwean telecom billionaire Strive Masiyiwa and Swazi retail and property mogul Nathan "Natie" Kirsch.
Tanzania’s richest man also received an honorary doctorate in humane letters.
