On December 21, the United Kingdom’s Serious Fraud Office charged Stephane Esper, a former Societe Generale trader, with allegedly manipulating the Euro Interbank Offered Rate, a key benchmark for European banks known as the Euribor. Esper is the 11th individual charged in an ongoing investigation of Euribor manipulation, but the first to date at Societe Generale; the others charged so far have been at Deutsche Bank and Barclays.