3: Gustav Magnar Witzoe – 3 Billion Dollars
Gustav Magnar Witzoe
Age: 26 years
Total assets: $3B
Gustav Magnar Witzoe claims about a portion of SalMar ASA, one of the world’s biggest salmon makers. SalMar led the industrialization of salmon cultivating in Norway. This stake was given to him in 2013 by his dad, Gustav Magnar Sr., who established the organization in 1991. Since his dad still runs the organization, Gustav puts resources into land and tech new companies.