Jerome Kerviel, 31:-a spectacular Frenchman dracula-trader who lives on a third-floor apartment in the exclusive Paris suburb of Neuilly,his home town of Pont-l'Abbe in Brittany and near his workplace in the capital's financial area of La Defense.
He is a junior within the bank and had worked for SocGen since 2002.
He's being sought after for fooling his bosses in carrying out a massive €4.9 billion ($A8.2 billion) fraud - one of the biggest in financial history.
Societe Generale chief executive and chairman Daniel Bouton said the trader had used "extremely sophisticated and varied techniques" to carry out the fraud and that he "had the intelligence to escape all control procedures".
Kerviel, who earned less than €100,000 euros a year, allegedly built up the huge losses dealing in derivatives tradings.
Societe Generale said in a statement that the rogue trader had been carrying out what it called "vanilla futures hedging" on European equity markets - industry jargon for the most basic kind of futures purchase.
It said he had an in-depth knowledge of the bank's control systems, and managed to cover his tracks "through a scheme of elaborate fictitious transactions".
These were discovered and investigated on January 19 and 20, it said.
A Societe Generale union source said it appeared that the trader had not acted for personal profit.
It said he had an in-depth knowledge of the bank's control systems, and managed to cover his tracks "through a scheme of elaborate fictitious transactions".
These were discovered and investigated on January 19 and 20, it said.
A Societe Generale union source said it appeared that the trader had not acted for personal profit.
Little is known yet about Kerviel. Management des Operations de Marche, a business school in Lyon, lists him as a 2000 graduate.
He is the seventh individual singled out for unauthorized trading since 1994. Today he has unexpectedly joined the club of rogue traders .
The Sorceror.
With global markets on a knife's edge after sharp falls in share prices this week, the bank, Societe Generale, has announced a loss of 6.9 billion euros, the largest in European history, according to Bloomberg.
Societe Generale "was a leader in derivatives and was considered one of the best risk managers" in the world, he told Bloomberg.
But Ion-Marc Valhi, of the Swiss bank, Amas, told the BBC: "I am sorry but I have a hard time buying the fact that a trader was able to set up a 'secret trade' of 4.9 billion without anybody finding out."
But Ion-Marc Valhi, of the Swiss bank, Amas, told the BBC: "I am sorry but I have a hard time buying the fact that a trader was able to set up a 'secret trade' of 4.9 billion without anybody finding out."
The bank, which insisted he had acted alone, said he took out "massive fraudulent directional positions in 2007 and 2008 beyond his limited authority".
Experts however had trouble accepting that a trader could have managed to successfully hide such colossal losses.
"It seems a bit much to believe that for an entire year this would have gone undetected," said Elie Cohen, a professor of economics at the Paris Institute of Political Studies.
"One person alone cannot trigger such a catastrophe," commented Arnaud Riverain from the private firm Arkeon Finance. The bank's trading desk must have suffered from some "dysfunction", he said.
Experts however had trouble accepting that a trader could have managed to successfully hide such colossal losses.
"It seems a bit much to believe that for an entire year this would have gone undetected," said Elie Cohen, a professor of economics at the Paris Institute of Political Studies.
"One person alone cannot trigger such a catastrophe," commented Arnaud Riverain from the private firm Arkeon Finance. The bank's trading desk must have suffered from some "dysfunction", he said.