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The Informational Role of Option Trading Volume in Equity Index Options Markets

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Abstract

This paper examines the dynamic relations between future price volatility of the S&P 500 index and trading volume of S&P 500 options to explore the informational role of option volume in predicting the price volatility. The future volatility of the index is approximated alternatively by implied volatility and by EGARCH volatility. Using a simultaneous equation model to capture the volume-volatility relations, the paper finds that strong contemporaneous feedbacks exist between the future price volatility and the trading volume of call and put options. Previous option volumes have a strong predictive ability with respect to the future price volatility. Similarly, lagged changes in volatility have a significant predictive power for option volume. Although the volume-volatility relations for individual volatility and volume terms are somewhat different under the two volatility measures, the results on the predictive ability of volume (volatility) for volatility (volume) are broadly similar between the implied and EGARCH volatilities. These findings support the hypothesis that both the information- and hedge-related trading explain most of the trading volume of equity index options.

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Authors and Affiliations

  1. Department of Finance, Insurance and Real Estate, St. Cloud State University, St. Cloud, MN, 56301-4498, USA

    Ghulam Sarwar (Professor of Finance)

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  1. Ghulam Sarwar
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Correspondence to Ghulam Sarwar.

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Sarwar, G. The Informational Role of Option Trading Volume in Equity Index Options Markets. Rev Quant Finan Acc 24, 159–176 (2005). https://doi.org/10.1007/s11156-005-6335-0

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