Dispersion Trading

Dispersion trading is an advanced volatility arbitrage strategy that exploits the difference between implied volatility of an index and the weighted implied volatilities of its constituent stocks. The core insight is that index implied volatility tends to be overpriced relative to individual stock volatilities because the index benefits from diversification — correlation between stocks reduces index realised volatility. A dispersion trader sells index options (collecting the implied volatility premium) and simultaneously buys options on individual constituent stocks to hedge directional exposure. Profits are generated when realised correlation is lower than the implied correlation embedded in index option prices. In India, dispersion traders use Nifty 50 options and options on large-cap stocks like Reliance, HDFC Bank, and TCS to implement this strategy.