The services offered by financial advisors and portfolio managers are qualified by the existence of a heightened bond of trust that calls for judicial recognition specific to this reality. In this article that comprises the third part of a trilogy of articles published in this edition of Revue générale de droit, the author intends to show how positive law takes into account the specificity of the relationships of trust between investment service providers and their clients. More specifically, the analysis emphasizes that, in this highly regulated sector of activity, a unifying thread emerges that manifests itself by an intensification of the obligations imposed on financial intermediaries and by a corresponding decrease of consumer obligations as well as by the imposition of specific sanctions and penalties on investment service providers.