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".
Oleg Deripaska, Alisher Usmanov and Suleiman Kerimov all recently faced margin calls--and sharp hits to their wealth.
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.
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.
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.
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.
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.
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
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