Mikhail Prokhorov
Mikhail Prokhorov (1966-). Interros, a venture with Vladimir Potanin includes metals, engineering, agriculture and media; since 2001 Prokhorov has been chairman of its most valuable holding, metals conglomerate Norilsk Nickel; has a slightly larger stake than his longtime partner.
Fortune
$4.4 billion as of 2005.
$4.8 billion as of 2004.