The Indonesia Stock Exchange (IDX), also known as Bursa Efek Indonesia, is the main stock exchange of Indonesia. It is the result of a merger between the Jakarta Stock Exchange and the Surabaya Stock Exchange. IDX is regulated and supervised by the Indonesia Financial Services Authority and is headquartered in Jakarta, the country's capital, largest city and the center of economics. The transactions are processed through their trading system called JATS. IDX lists 537 companies with a market cap of IDR 5,753.6 trillion. The exchange also houses bonds and derivatives. Among the listings are well-known and actively traded companies such as Bank MNC Internasional, the Indorama Corporation, Panin Bank, Suparma and Langgeng Makmur Industri. IDX manages the IDX Composite, a modified capitalization-weighted index of all listed stocks. The exchange also operates nine market sector indices and the LQ45, which tracks the performance of the 45 most liquid stocks. The constituents of the LQ45 are screened for eligibility and reviewed semi-annually. In 2011 IDX launched the Indonesia Sharia Stock Index (ISSI), which comprises 214 stocks that have been screened for Shariah compliance.