The crimes against capital market break economic values and norms. These crimes act against just competition and the transparency of information and undermine trust among capital market actors. Therefore, on the one hand, criminal policy makers envisage criminalization and penalization and on the other hand, they utilize prevention measures.The prevention policy aims at reducing and eradicating criminality factors.The legislator has identified preventive duties for securities and exchange organization in the framework of the Islamic Republic of Iran’s market securities act which ratified in 1384. These duties can effect economic crimes and establish security in capital market. In this article, the preventive duties of securities and exchange organization are studied
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