Since the outbreak of the financial crisis, during which a large number of investors lost significant amounts of money, investor protection has played a central role in securities supervision legislation at both the European and national levels. The number of compensation lawsuits filed in this context has risen sharply and is expected to increase further at the next correction of the financial markets. Walter Harecker presents the development and systematics of securities supervisory law and also comprehensively addresses the landmark jurisprudence. He provides a practical examination of the framework established by MiFID for assessing the legal relationship between providers and investors, focusing on both the supervisory and civil law components of this matter. The actions taken in the interest of the customer and the obligations to provide information are presented in detail.