The aim of this book is to describe, from a European and French perspective, the relationship between the law of financial markets and instruments and private international law. Where there is a foreign element, the rules of financial law are most often presented as overriding mandatory rules or administrative rules. The establishment of a national supervisory authority with administrative, normative and repressive powers is likely to amplify this perception, as is the appearance of financial law rules in litigation where they seem to derogate from the normally applicable solution rather than coherently form a new category. However, this presentation by means of the lois de police methodology does not provide an overall view of the body of legislation put in place by financial law, nor does it provide a key to the application of these rules.