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  • Journal of Financial and Quantitative Analysis, Volume 42, Issue 1
  • March 2007, pp. 167-187

Stealth Trading in Options Markets

  • Amber Anand (a1) and Sugato Chakravarty (a2)
  • DOI:
  • Published online: 01 April 2009

We investigate how price discovery occurs in the options markets through traders' trade size choice. By employing transactions data on all options traded on a sample of 100 firms, we show that informed traders fragment their orders into small (medium) trades for low (high) volume contracts. We also find that almost 60% of the price discovery occurs in the exchange with the largest market share for a given option, where informed traders favor medium size trades. Upon examining distinct option series for a given stock, we find that at-the-money calls display the highest information share.

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