Est. net worth: $17.9 bn*
Main holdings: New Jersey Nets basketball team, Rusal (world's largest aluminum producer); Polyus Gold (Russia's No. 1 gold producer); Renaissance Capital (Moscow-based investment bank)
Family Status: Single, no children. "I really would be quite happy if he got married," Prokhorov's sister, Irina, told Bloomberg TV. "When we celebrate his birthday, my toast is: 'Please give me nephews!' "
Est. net worth: $10.7 bn*
Main holdings: Lukoil (Russia's No. 2 oil company)
Family Status: Married with one son. He hopes his son, Yusuf, 20, will join the company and eventually become CEO. "He is ready to be an oilman, and he must become one," he told Russia's Itogi magazine.**
Est. net worth: $10 bn*
Main holdings: Norilsk Nickel (world's biggest nickel and palladium producer); Russian lender Rosbank; Prof-Media, a media company
Family Status: Married, three children, ages 11-26, including jet ski champ Anastasia. Plans to give most of his fortune to charity. "An inherited billion kills a person, depriving him of a meaning in life," he told Bloomberg News.
Est. net worth: $8 bn*
Main holdings: Magnitogorsk Iron & Steel (Russia's third-biggest steelmaker)
Family Status: Married, two daughters and at least three grandchildren. "Running such a company requires a professional and a man. Magnitogorsk isn't a cake factory. My hope is for grandsons to take over," he told Russia's Vedomosti newspaper.***
Est. net worth: $3.4 bn*
Main holdings: Aeroflot, Ilyushin Finance, opposition newspaper Novaya Gazeta, Britain's Independent and Evening Standard newspapers.
Family Status: Divorced, two sons, ages 30 and 1. He supports his older son's interests in London. "I never pushed him on [business]. He actually likes art. Newspapers, yes, but they aren't a business for us," says Lebedev.
* estimates by Russia's Finans business magazine
** Interview, Nov. 27, 2006
*** Interview, Sept. 7, 2007
Data: Bloomberg, Finans, Itogi, Vedomosti