The shares were up 5.8 percent at 25 euros at 2:06 a.m. EDT after closing at 22.18 euros in Paris on Wednesday.
Rumors about a French sovereign debt downgrade, an expanded bailout for Greece that would hurt French banks and a government bailout of SocGen due to liquidity problems -- all denied -- had pulled shares of France's second-largest bank down in the heaviest volume since the 2008 financial crisis.
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SocGen Chief Executive Frederic Oudea dismissed the rumors as "absolutely rubbish" in an interview with CNBC television after the market closed, adding that rumors about a downgrade of France's sovereign debt rating were "very strange" and contrary to the reality of the situation.
(Reporting by James Regan; Editing by Leila Abboud)