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How Informed Investors Take Advantage of Negative Information in Options and Stock Markets

Authors

  • Jangkoo Kang,

    1. Jangkoo Kang is a Professor in Korea Advanced Institute of Science & Technology, Dongdaemun-Gu, Seoul, Korea
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  • Hyoung-Jin Park

    Corresponding author
    1. Hyoung-Jin Park is an Assistant Professor in Seoul Women's University, Nowon-Gu, Seoul, Korea
    • Correspondence author, Seoul Women's University, 621 Hwarangro, Nowon-Gu, Seoul 139-774, Korea. Tel: +82-2-970-5518, e-mail: narita@swu.ac.kr

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  • This work was supported by a special research grant from Seoul Women's University (2014).

Abstract

We examine whether and how investors establish positions in options when they have negative information in the U.S. markets from August 2004 to January 2009. Our empirical results show that options seem to be actively and effectively used for the exploitation of negative information. General trading volumes and bid–ask spreads of options remarkably increase like those of stocks as the short sellers increase their selling pressure. Notably, we find that the difference between a stock's traded price and its implied price from the options market reaches its peak about 2 weeks before the short sale trading activity reaches its peak. We also observe that synthetic short positions measured by this difference are preferred over OTM put positions by investors with negative information. Finally, economically significant returns based on a strategy using the difference in the traded and implied stock prices as a trading signal support our evidence. Moreover, these profits confirm the findings of the previous research which argue that options are shelters for informed investors. © 2014 Wiley Periodicals, Inc. Jrl Fut Mark 34:516–547, 2014

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