Oleg Deripaska, Russia's richest man last year, was forced to sell two valuable holdings.
Rusal, controlled by one of Russia's richest men, Oleg Deripaska, dismissed the allegations as "groundless".
Deripaska subsequently had to offload assets to help manage billions in debt he had accumulated.
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Deripaska is also dealing with margin calls at his mining company, Rusal, as metal prices plunge.
Oleg Deripaska, Alisher Usmanov and Suleiman Kerimov all recently faced margin calls--and sharp hits to their wealth.
Prokhorov's most notable transaction would probably be the sale of his 25% stake in Norilsk Nickel to Deripaska.
Mr Deripaska was once the richest man in Russia and is now reported to be the country's 14th-wealthiest individual.
Russian oligarch Oleg Deripaska used the listing in part to shore up his finances after accumulating billions in debt.
Since 2006 the firm - formerly Leyland DAF Vans - has been owned by Russia's Gaz Group, controlled by Oleg Deripaska.
The Deripaska episode epitomises what some regard as his biggest flaw: though clever, he is sometimes impetuous and a compulsive political game-player.
In 2003 to 2004, sold stake in Russian Aluminum to Oleg Deripaska.
Friday's fall came a day after Russian billionaire Oleg Deripaska was reported to not be interested in owning a majority stake in the company.
Mr. Deripaska's group said it had acquired 10% of Hochtief last spring, when the construction company was trading at about three times its level today.
Gutseriyev was allowed to sell Russneft to another billionaire, Oleg Deripaska, who then got deep into debt and was forced to sell it back to Gutseriyev.
Last week a Moscow arbitration court stated that transactions Deripaska pushed through at a general meeting in May 2009 by his Basel holding company were invalid.
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It also hopes to make a play in the Russian car market with the help of GAZ, an automotive company owned by Oleg Deripaska, a metals tycoon.
Mr Khodorkovsky was part of another potentially troublesome group, says Mr Mukhin, that included Roman Abramovich, an oil man and now English-football tycoon, and Oleg Deripaska, an aluminium baron.
Oleg Deripaska, the former metals trader who emerged from the violence of Russia's aluminum industry unscathed and in control of Russian Aluminum (Rusal), takes classes at the London School of Economics.
What worries Milka Tadic, a well-known local journalist, is what would happen if President Vladimir Putin decided to gobble up Mr Deripaska's Rusal group, just as he did the oil giant Yukos.
Magna's bid was backed by Russia's state-run Sberbank and Oleg Deripaska's truck firm Gaz, and it has said it wants Opel and GM to gain 20% of the Russian market in the short term.
Mr. Deripaska's ceding of an interest in the German construction company and the Canadian auto-parts maker show how severely the global credit crisis is affecting the wealth of at least some of Russia's oligarchs.
Czech billionaire Petr Kellner won another round against Russian mogul Oleg Derispaska over assets of Russian insurance company, Ingosstrakh, at the same time as Deripaska is touting his much-ballyhooed public offering of aluminum giant Rusal in Hong Kong.
FORBES: Czech Billionaire Lawsuit Casts Shadow on Oleg Deripaska's IPO
Mr. Deripaska has been working with a small group of advisers in Washington and London who have helped him deal with inquiries and lawsuits over his alleged ties to organized crime, according to business records and interviews with people involved in the work.
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