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This article deals with the self-insider, i.e. the possible creation of the inside information by a person and its (abusive) exploitation. It describes the situation in Italy and Germany and then provides a taxonomy of the several cases of selfinsider. The article then analyzes the case law of the ECJ and the MAR regulatory provisions for justifying/neglecting the existence of the self-insider (Article 9.5 and 9.6 MAR). Given the unclear regulatory answer regarding its sanctionability, the article proposes, based on the economics of MAR, a law and economics reason of why the self-insider sometime should be sanctioned, by describing it as a peculiar monopolistic behavior able to distort investors’ confidence and market integrity. Finally, the article suggests that the European legislator should explicitly deal with the problem.


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