A Transaction Cost Perspective on Option Anomalies

Abstract

We examine the impact of transaction costs on the profitability of long-short portfolios of delta-hedged option returns. Of the 24 portfolio sort variables studied, 17 generate positive and significant gross returns, but none remain profitable after accounting for trading costs. We propose a cost-mitigation approach that restores profitability to 7 key portfolios. Furthermore, we demonstrate that the choice of delta-hedging frequency has a first-order impact on transaction costs. Our findings underscore the central role of implementation costs in shaping the investment opportunity set in equity–option markets, highlighting the need to account for transaction costs when evaluating option-based strategies.

Keywords: Asset-pricing, option returns, transaction costs, market frictions

JEL Classification: G11, G12, G13