Jean-Pierre Mustier said Tuesday he would stay in charge of the investment banking division at Société Générale, after the unit reported fresh writedowns of €1.18bn. Mustier’s future has been in question since January, when France’s second-biggest bank reported a €4.9bn trading loss after Jerome Kerviel, a junior trader, built up €50bn in unauthorised positions. Mustier offered to resign in January and to date, SocGen has stood by him. Mustier’s reputation has been damaged as a result of the Kerviel affair and mounting writedowns. On Monday, former finance director Frédéric Oudéa was confirmed as the new chief executive after Daniel Bouton agreed to split his roles and to stay on as chairman.