Volatility Trading and Arbitrage Strategies › Volatility Trading and Arbitrage Strategies

Volatility is more than just a parameter in option pricing models; it is a tradeable asset class in its own right. While you might focus on predicting the direction of asset prices, you take positions on the magnitude of future price movements, regardless of direction. This distinction opens up an entirely different dimension of market opportunity.

The appeal of volatility trading stems from several observations. First, as we explored in Part III's discussion of implied volatility and the volatility smile, implied volatility extracted from option prices often differs systematically from subsequently realized volatility. This persistent gap, known as the volatility risk premium, creates opportunities for those who can model and harvest it. Second, volatility exhibits mean-reverting behavior and clustering effects, as we saw when studying GARCH models in Part III, Chapter 18. These statistical properties make volatility more predictable than price returns in certain respects. Third, volatility positions can provide portfolio diversification benefits, as volatility tends to spike during market stress when traditional assets decline.

This chapter develops the tools and strategies for trading volatility. We begin by examining the instruments available, from vanilla options to VIX futures and variance swaps, before diving into delta hedging strategies that isolate pure volatility exposure. We then explore volatility arbitrage, where you exploit mispricings between implied and realized volatility, and dispersion trading, which capitalizes on the relationship between index volatility and constituent volatility. Throughout, we emphasize the substantial risks involved, particularly for strategies that are short volatility.