 Kuzmichev indirectly controls about 10 percent of VimpelCom, the world's sixth-biggest mobile phone operator; 18 percent of Alfa-Bank, Russia's largest closely held bank; and 11 percent of X5 Retail Group.In March 2013, Kuzmichev sold his stake in energy venture TNK-BP to state-run oil company Rosneft for $2.5 billion.Forbes magazine rates Kuzmichev as the 138th world's richest person (2013) with a fortune estimated at $8.8 billion.