The Nifty 50 is India's premier benchmark stock market index, maintained by NSE Indices Limited — a wholly owned subsidiary of the National Stock Exchange of India (NSE). It comprises the 50 largest, most liquid, and financially sound companies listed on NSE, selected from 13 sectors of the Indian economy. The index is constructed using free-float market capitalisation methodology, where each constituent's weight is based on its publicly tradeable shares outstanding rather than total shares issued. Nifty 50 is reviewed and reconstituted semi-annually in January and July based on updated eligibility criteria including market capitalisation, liquidity, float, and financial health. As the primary benchmark for Indian equity markets, Nifty 50 is the reference index for over ₹10 lakh crore in passive investment assets — including index funds, ETFs, and smart beta strategies. The index's real-time movement is also the underlying for the most actively traded futures and options contracts in Indian derivatives markets, making it the single most important financial indicator in India.
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