Trading Around Option Expiration Days

Posted in Calendar Effects, Equity Options

 

Are there any stock market return/volatility anomalies around the equity option expiration (OE) day (third Friday of each month)? Potential anomalies include: (1) systematic differences in returns and volatilities before, on and after OE; and, (2) systematic differences in OE returns conditional on prior-month returns. To investigate, we examine close-to-close returns from five trading days before through five trading days after OE. Using daily closing prices for the S&P 500 Index for January 1990 through December 2013 (287 OEs, with September 2001 excluded due to trading disruption) and for the iPath S&P 500 VIX Short-Term Futures ETN (VXX) during January 2009 through December 2013 (59 OEs), we find that: (more…)

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