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Insider Trading in the Swiss Stock Market

  • Andreas Zingg
  • Sebastian Lang
  • Daniela Wyttenbach
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    Many studies on insider trading are based on data of the U.S. market and conclude that insiders can earn abnormal profits. This paper examines for the Swiss stock market whether insiders can earn abnormal profits and whether outsiders can make abnormal profits by mimicking the transactions of insiders. We find significant abnormal returns for insider trading, as well as some evidence for profitable mimicking strategies. We can reject the strong form Efficient Market Hypothesis for the Swiss stock market. However, with regard to the semi-strong form Efficienct Market Hypothesis, it remains unclear whether it is true for the Swiss stock market.

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    Article provided by Swiss Society of Economics and Statistics (SSES) in its journal Swiss Journal of Economics and Statistics.

    Volume (Year): 143 (2007)
    Issue (Month): III (September)
    Pages: 331-362

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    Handle: RePEc:ses:arsjes:2007-iii-4
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    1. John, Kose & Mishra, Banikanta, 1990. " Information Content of Insider Trading Around Corporate Announcements: The Case of Capital Expenditures," Journal of Finance, American Finance Association, vol. 45(3), pages 835-55, July.
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    6. Fama, Eugene F, 1970. "Efficient Capital Markets: A Review of Theory and Empirical Work," Journal of Finance, American Finance Association, vol. 25(2), pages 383-417, May.
    7. Fama, Eugene F, et al, 1969. "The Adjustment of Stock Prices to New Information," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 10(1), pages 1-21, February.
    8. Rozeff, Michael S & Zaman, Mir A, 1988. "Market Efficiency and Insider Trading: New Evidence," The Journal of Business, University of Chicago Press, vol. 61(1), pages 25-44, January.
    9. Wisniewski, Tomasz P. & Bohl, Martin T., 2005. "The Information Content of Registered Insider Trading Under Lax Law Enforcement," International Review of Law and Economics, Elsevier, vol. 25(2), pages 169-185, June.
    10. A. Craig MacKinlay, 1997. "Event Studies in Economics and Finance," Journal of Economic Literature, American Economic Association, vol. 35(1), pages 13-39, March.
    11. Mikkelson, Wayne H. & Partch, M. Megan, 1988. "Withdrawn Security Offerings," Journal of Financial and Quantitative Analysis, Cambridge University Press, vol. 23(02), pages 119-133, June.
    12. Sylvain Friederich & Alan Gregory & John Matatko & Ian Tonks, 2002. "Short-run Returns around the Trades of Corporate Insiders on the London Stock Exchange," European Financial Management, European Financial Management Association, vol. 8(1), pages 7-30.
    13. Brown, Stephen J. & Warner, Jerold B., 1985. "Using daily stock returns : The case of event studies," Journal of Financial Economics, Elsevier, vol. 14(1), pages 3-31, March.
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    16. Seyhun, H. Nejat, 1986. "Insiders' profits, costs of trading, and market efficiency," Journal of Financial Economics, Elsevier, vol. 16(2), pages 189-212, June.
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