Bombay Stock Exchange Ltd is the oldest stock exchange in Asia with a rich heritage. The exchange is the largest of 22 exchanges in India with over 6000 listed companies. They offer trading in cash and derivatives and corporate and government securities. They also provide equity market data indices corporate data book building derivatives data debt data real time data minute snapshot minute delayed snapshot end of day quotation file and debt market products. The Bombay Stock Exchange uses the BSE Sensex India's first stock market index that enjoys an iconic stature. It is an index of 30 stocks representing 12 major sectors. The Sensex is constructed on a free-float methodology and is sensitive to market sentiments and market realities. This index gives a measure of the overall performance of the Bombay Stock Exchange and is closely followed around the world. Apart from the Sensex BSE offers 21 indices including 12 sectoral indices.An informal group of 22 stockbrokers had been trading under a banyan tree opposite the Town Hall of Bombay from mid 1850s. This informal group of stockbrokers organized themselves as 'The Native Share and Stockbrokers Association' which in 1875 was formally organized as the Bombay Stock Exchange. The exchange was established with 318 members with a fee of Re 1/-.In January 1899 the Brokers' Hall was inaugurated. After the First World War the Bombay Stock Exchange was housed in an old building near the Town Hall. In the year 1928 they acquired the present plot of land surrounded by Dalal Street Bombay Samachar Marg and Hammam Street. In the year 1930 they constructed a building and occupied in December of that year. In the year 1956 BSE obtained a permanent recognition from the Government of India under the Securities Contracts (Regulation) Act 1956.In the year 1995 the operations and dealings of the BSE were fully computerized and thus the famous out-cry system of share trading was replaced by screen based trading as in other modern stock exchanges around the world. They replaced the out-cry system with the totally automated trading through the BSE Online trading (BOLT) system. The BOLT network was expanded nationwide in the year 1997. BOLT is currently operating in 25000 Trader Workstations located across over 450 cities in India.In February 2001 BSE introduced the world's first centralized exchange-based Internet trading system BSEWEBX.com. This initiative enables investors anywhere in the world to trade on the BSE platform.In the year 2002 the name 'The Stock Exchange Mumbai' was changed to Bombay Stock Exchange. In August 19 2005 the exchange was turned into a corporate entity from an Association of Persons (AoP) and renamed as Bombay Stock Exchange Ltd.In the year 2006 BSE launched the Directors Database and Indian Corporate Electronic Reporting System (ICERS) to facilitate information flow and increase transparency in the Indian capital market. While the Directors Database provides a single-point access to information on the boards of directors of listed companies the ICERS facilitates the corporates in sharing with BSE their corporate announcements. BSE entered into an index co-operation agreement with Deutsche Borse. This agreement has made SENSEX and other BSE indices available to investors in Europe and America. Moreover Barclays Global Investors (BGI) created the iShares BSE SENSEX India Tracker which tracks the SENSEX. The ETF enables investors in Hong Kong to take an exposure to the Indian equity market.