Recital 164

Since the objective of this Directive, namely creating an integrated financial market in which investors are effectively protected and the efficiency and integrity of the overall market are safeguarded, requires the establishment of common regulatory requirements relating to investment firms wherever they are authorised in the Union and governing the functioning of regulated markets and other trading systems so as to prevent opacity or disruption on one market from undermining the efficient operation of the Union financial system as a whole which cannot be sufficiently achieved by the Member States but can rather, by reason of the scale and effects of this Directive, be better achieved at Union level, the Union may adopt measures in accordance with the principle of subsidiarity as set out in Article 5 of the Treaty on European Union. In accordance with the principle of proportionality, as set out in that Article, this Directive does not go beyond what is necessary in order to achieve that objective.