2008 Société Générale trading loss

In January 2008, the bank Société Générale lost approximately €4.9 billion closing out positions over three days of trading beginning January 21, 2008, a period in which the market was experiencing a large drop in equity indices. The bank states these positions were fraudulent transactions created by Jérôme Kerviel, a trader with the company. The police stated they lacked evidence to charge him with fraud and charged him with breach of trust and illegally accessing computers. Kerviel states his actions were known to his superiors and that the losses were caused by panic selling by the bank. Société Générale's own wrongs were later established by a French jurisdiction, which led the Cour de cassation to cancel the €4.9 billion sanction on Kerviel.