Triennial Central Bank Survey Foreign exchange and derivatives market activity in April 2010 Preliminary results Monetary and Economic Department September 2010 Queries concerning this report should be addressed to the authors listed below: Sections I + II: Karsten von Kleist tel +41 61 280 8408 e-mail: karsten.von-kleist@bis.org Sections III + IV: Carlos Mallo tel +41 61 280 8256 e-mail: carlos.m