NIFTY 50 is the main index for the National Stock Exchange of India (NSE). It tracks the performance of the top 50 stocks by market capitalization from 13 sectors of the Indian economy. With such a relatively small number of companies within the index it still represents over 60% of the free float market capitalization of the stocks listed on NSE, and serves as a benchmark for fund portfolios and index funds. The list of the NIFTY 50 Index constituents is rescheduled every 6 month.