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The Dog That Did Not Bark: Insider Trading and Crashes

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  • Jacques Olivier
  • José M. Marín

Abstract

This paper documents that at the individual stock level insiders sales peak many months before a large drop in the stock price, while insiders purchases peak only the month before a large jump. We provide a theoretical explanation for this phenomenon based on trading constraints and asymmetric information. We test our hypothesis against competing stories such as patterns of insider trading driven by earnings announcement dates, or insiders timing their trades to evade prosecution. Finally we provide new evidence regarding crashes and the degree of information asymmetry.

Suggested Citation

  • Jacques Olivier & José M. Marín, 2006. "The Dog That Did Not Bark: Insider Trading and Crashes," Working Papers 241, Barcelona School of Economics.
    • Handle: RePEc:bge:wpaper:241
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    References listed on IDEAS

    as
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    More about this item

    Keywords

    Insider Trading; Rational Expectations Equilibrium; Trading Constraints; volatility; crashes;
    All these keywords.

    JEL classification:

    • D82 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Asymmetric and Private Information; Mechanism Design
    • G11 - Financial Economics - - General Financial Markets - - - Portfolio Choice; Investment Decisions
    • G12 - Financial Economics - - General Financial Markets - - - Asset Pricing; Trading Volume; Bond Interest Rates
    • G14 - Financial Economics - - General Financial Markets - - - Information and Market Efficiency; Event Studies; Insider Trading
    • G28 - Financial Economics - - Financial Institutions and Services - - - Government Policy and Regulation

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