Option Mispricing around Nontrading Periods

Option Mispricing around Nontrading Periods

  • CHRISTOPHER S. JONES
  • JOSHUA SHEMESH

Article first published online: 10th January 2018 DOI: 10.1111/jofi.12603

Abstract


We find that option returns are significantly lower over nontrading periods, the vast majority of which are weekends. Our evidence suggests that nontrading returns cannot be explained by risk, but rather are the result of widespread and highly persistent option mispricing driven by the incorrect treatment of stock return variance during periods of market closure. The size of the effect implies that the broad spectrum of finance research involving option prices should account for nontrading effects. Our study further suggests how alternative industry practices could improve the efficiency of option markets in a meaningful way.

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