(13)It is necessary to establish a comprehensive regulatory regime governing the execution of transactions in financial instruments irrespective of the trading methods used to conclude those transactions so as to ensure a high quality of execution of investor transactions and to uphold the integrity and overall efficiency of the financial system. A coherent and risk-sensitive framework for regulating the main types of order-execution arrangement currently active in the European financial marketplace should be provided for. It is necessary to recognise the emergence of a new generation of organised trading systems alongside regulated markets which should be subjected to obligations designed to preserve the efficient and orderly functioning of financial markets and to ensure that such organised trading systems do not benefit from regulatory loopholes.