Document Type


Publication Date

January 2011


exchange-traded funds, index options, implied volatility, open interest


Finance and Financial Management


We examine the option-implied volatility of the three most liquid ETFs (Diamonds, Spiders, and Cubes) and their respective tracking indices (Dow 30, S&P 500, and NASDAQ 100). We find that volatility smiles for ETF options are more pronounced than for index options, primarily because deep-in-the money ETF options have considerably higher implied volatility than deep-in-the-money index options. The observed difference in implied volatility is not due to a difference between the realized return distributions of the underlying ETFs and indices. Differences in implied volatility for ETF and index options also do not appear to be explained by discrepancies in net buying pressure, as theorized by Bollen and Whaley (2004).


Copyright © 2005-2014 The IBFR. All Rights Reserved. This article originally appeared in International Journal of Business and Finance Research in Volume 5, Issue 4 and can be found online at this link.