Industry: Banking & Finance
Company: Saudi Oger
Country: Saudi Arabia
Wealth: 2.3 Billion
Bahaa is the eldest son of the late Rafik Hariri and the third Hariri to make it into our list. In March last year, Bahaa left family-owned Saudi Oger, a construction, utility and telecommunications company, to launch his own property business, which he runs from his base in Geneva.
Hariri's firm, Horizon Development, is in a partnership with Jordan's government owned real estate developer to build a $5bn mini-city in the port of Aqaba on the Red Sea.
In Lebanon, meanwhile, Horizon is building residential towers, commercial shopping centres and a hotel valued at close to $500m. The Boston University graduate is also involved in a multibillion-dollar economic city development in the northwestern Saudi Arabian city of Tabuk, and chairs two soccer clubs in Lebanon.