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Why do investment banks buy put options from companies?

Author

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  • Gyoshev, Stanley B.
  • Kaplan, Todd R.
  • Szewczyk, Samuel H.
  • Tsetsekos, George P.

Abstract

Companies have collected billions in premiums from privately sold put options written on their own stock. It is puzzling that counterparties, investment banks, would agree to make such transactions with better-informed companies which have extraordinary ability to time the market as documented by Jenter et al. (2011). To resolve this puzzle, we develop a model that shows that investment banks, by offering to buy put options from better-informed parties, receive private information about issuing companies. Our model also incorporates the practice of firms (such as Microsoft) of sometimes repurchasing their own put options and thus providing additional private information to investment banks. Empirically, we find support for our theory from an abnormal 9% increase in the stock prices and a 40% increase in the trading volumes around the put sales. Examination of 13D filings reveals that trading by upper management insiders cannot completely account for the change in volume.

Suggested Citation

  • Gyoshev, Stanley B. & Kaplan, Todd R. & Szewczyk, Samuel H. & Tsetsekos, George P., 2021. "Why do investment banks buy put options from companies?," Journal of Corporate Finance, Elsevier, vol. 67(C).
    • Handle: RePEc:eee:corfin:v:67:y:2021:i:c:s0929119920301620
    DOI: 10.1016/j.jcorpfin.2020.101718
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    References listed on IDEAS

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    More about this item

    Keywords

    Screening; Separating equilibrium; Put options; Information acquisition; Strategic trading;
    All these keywords.

    JEL classification:

    • 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
    • G24 - Financial Economics - - Financial Institutions and Services - - - Investment Banking; Venture Capital; Brokerage
    • G28 - Financial Economics - - Financial Institutions and Services - - - Government Policy and Regulation
    • C7 - Mathematical and Quantitative Methods - - Game Theory and Bargaining Theory
    • D82 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Asymmetric and Private Information; Mechanism Design

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