PARIS, February 6, 2008 (Nouvelle Solidarité) -- According to the Wall Street Journal, the U.S. Securities Exchange Commission (SEC) opened an investigation on the possible "insider trading" operated by shadowy American billionaire and Schwarzenegger advisor Robert A. Day, who, as a director of Société Générale, sold over 1.5 million of his shares just days before the "rogue trader" fraud sparked heavy losses. The Brooklyn prosecutor also opened a criminal investigation on a case tied to Société Générale whose content is so far unspecified.