The Nifty 50 is India's premier benchmark stock market index, maintained by NSE Indices Limited — a subsidiary of the National Stock Exchange (NSE). It comprises 50 of the largest, most liquid, and most financially sound companies listed on NSE, selected across 13 sectors of the Indian economy. The index uses a free-float market capitalisation methodology, where each stock's weight is proportional to its publicly tradeable shares outstanding rather than total shares. Nifty 50 is reconstituted semi-annually in January and July based on updated eligibility criteria. As the primary benchmark for Indian equity mutual funds, ETFs, index funds, and F&O contracts, Nifty 50 is the single most tracked financial indicator in Indian capital markets — serving as the benchmark for over ₹10 lakh crore in passive investment assets. The index's real-time value reflects the aggregate performance of India's blue-chip corporate sector and is widely used as a proxy for the overall health of the Indian economy.