Central Securities Depository of Iran is a public joint stock company, offering pre-trade and post-trade services to the Iranian capital market participants. CSDI was established as the sole registrar, safe-keeper, depository and clearing house for a broad range of financial instruments traded on the four Iranian exchanges i.e. Tehran Stock Exchange (TSE), Iran Mercantile Exchange (IME), Iran Energy Exchange (IRENEX) and Iran FaraBourse (IFB). CSDI was founded in 2005 but its history goes back to 1967 when the Tehran Stock Exchange Brokers Association was established as the first entity in Iran capital market, being in charge of all the responsibilities, both executive and supervisory, regarding this market. However, in December 2005, the Islamic Republic of Iran Securities Market Act (SMA) was ratified by the Iranian Parliament and the structure of the Iranian capital market became demutualized. Based on the stipulations of the SMA, the Tehran Stock Exchange Brokers Association was dissolved and its regulatory and supervisory tasks were delegated to the Securities and Exchange Organization (SEO) and Central Securities Depository of Iran turned into an independent entity. CSDI as a self-Regulatory Organization (SRO) is subject to the supervision of the SEO and acts based on the rules and regulations enacted by the Iranian Parliament, the Securities and Exchange High Council, as the macro-policy maker in the capital market, and the Securities and Exchange Organization of Iran. As the primary infrastructure organization serving the capital market in Iran, Central Securities Depository of Iran helps automate, centralize, standardize and streamline processes critical to the security and reliability of the market. We focus on key steps involved in the safe and efficient transfer of securities ownership and settlement of billions IR Rials trade obligations.