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Maturity Driven Mispricing of Options

Published online by Cambridge University Press:  19 January 2021

Assaf Eisdorfer
Affiliation:
The University of Connecticut School of Business assaf.eisdorfer@uconn.edu
Ronnie Sadka*
Affiliation:
Boston College Carroll School of Management
Alexei Zhdanov
Affiliation:
Pennsylvania State University Smeal College of Business auz15@psu.edu
*
ronnie.sadka@bc.edu (corresponding author)
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Abstract

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This paper documents that short-term options achieve significantly lower returns during months with 4 versus 5 weeks between expiration dates. The average return differential ranges from 16 to 29 basis points per week for delta-hedged portfolios, and from 101 to 187 basis points per week for straddles, over 1996–2017. Evidence based on earnings announcements and institutional holdings suggests that investor inattention to exact expiration date rather than underlying risk exposures or transaction costs can explain the mispricing. Market makers seem to adjust prices accordingly, and tend to over-trade mispriced options against less sophisticated investors.

Information

Type
Research Article
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of the Michael G. Foster School of Business, University of Washington