Includes the financial institutions engaged in securities as regarding the provision of electronic programs and technical systems necessary for the custody of securities in accordance with the conditions and specifications set by the market and approved by the ASCA, it includes providing an internal control system to ensure the compliance with regulations and decisions issued and the follow-up by the internal management,  it involves the receipt of interests and profits along with the right to subscribe and attend meetings of the General Assembly and vote on behalf shareholders after attaining their consents, arranging for the transfer of securities by the market on behalf of investors, operating lien or freezing at the request of the investors or his representative, lien on the securities based on court order in force unless there is another legal objection.