Insider dealing provokes many discussions. The common knowledge about this behaviour is that one may become rich thanks to a single transaction on a stock market. Such a perspective does not leave anyone indifferent; whether it be the expression of condemnation for such behaviour or an unspoken dream about becoming a well informed insider one day. Although many national systems prohibit insider dealing,1 its character and potential wrongfulness are still discussed by economists, ethicists and lawyers. Definitely not all of them share the opinion, expressed by many national legislations, that insider dealing is unfair, wrongful, or harmful for the economy as well as for individual market players. Nonetheless, it may be observed that as the new insider dealing regulations were enacted, the prohibition has been enforced by application of increasingly severe penalties, including the use of criminal sanctions. A question may, however, be raised on whether criminal law is a right tool to deal with the issue.