Jérôme Kerviel Jérôme Kerviel Jérôme Kerviel (; born 1977) is a French trader who was convicted in the 2008 Société Générale trading loss for breach of trust, forgery and unauthorized use of the bank's computers, resulting in losses valued at €4.9 billion. Société Générale characterizes Kerviel as a rogue trader and claims Kerviel worked these trades alone and without its authorization. These assertions have been met with skepticism by some of Kerviel's former colleagues and acquaintances, as well as by some members of the news media. Kerviel had told investigators that his trading behavior was widespread at the company and that making
Pattern day trader For example, a trader may use 3 day trades, and then enter a fourth position to hold overnight. If unexpected news causes the security to rapidly decrease in price, the trader is presented with two choices. One choice would be to continue to hold the stock overnight, and risk a large loss of capital. The other choice would be to close the position, protecting his capital, and (perhaps inappropriately) fall under the day-trading rule, as this would now be a 4th day trade within the period. Of course, if the trader is aware of this well-known rule, he should not