The services offered by financial advisors and portfolio managers are qualified by the existence of a heightened bond of trust that calls for an intensification of the obligations, sanctions and penalties imposed on these investment service providers. In this second part of a series of three articles published in this edition of the Revue générale de droit, the authors highlight the rationale of this particular judicial framework that takes the specificity of investment services into account. This study is, first of all, based on the agency's economic theory with a view to emphasizing the special nature of the powers exercised by intermediaries who act on behalf of others. Secondly, the authors analyze the different elements that justify the judicial recognition of the professional status of investment service providers to better understand the need to provide for a legal framework specific to these intermediaries whose services can lead to substantial economic and social repercussions on microeconomic as well as macroeconomic levels.