""Spiegel Online" stated that Kerviel may have lost 2.8 billion dollars on 140,000 contracts earlier negotiated due to DAX falling 600 points.Société Générale SA says it had a net loss in the fourth quarter of 2007 after the French bank took a €4.9 billion ($7.18 billion) hit closing the unauthorized trading positions of Jérôme Kerviel.