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Informed Trading in the Stock Market and Option-Price Discovery

Author

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  • Collin-Dufresne, Pierre
  • Fos, Vyacheslav
  • Muravyev, Dmitry

Abstract

When activist shareholders file Schedule 13D filings, the average stock-price volatility drops by approximately 10%. Prior to filing days, volatility information is reflected in option prices. Using a comprehensive sample of trades by Schedule 13D filers that reveals on what days and in what markets they trade, we show that on days when activists accumulate shares, option-implied volatility decreases, implied volatility skew increases, and implied volatility time slope increases. The evidence is consistent with a theoretical model where it is common knowledge that informed trading occurs only in the stock market and market makers update option prices based on stock-price and order-flow dynamics.

Suggested Citation

  • Collin-Dufresne, Pierre & Fos, Vyacheslav & Muravyev, Dmitry, 2021. "Informed Trading in the Stock Market and Option-Price Discovery," Journal of Financial and Quantitative Analysis, Cambridge University Press, vol. 56(6), pages 1945-1984, September.
    • Handle: RePEc:cup:jfinqa:v:56:y:2021:i:6:p:1945-1984_3
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    Citations

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    Cited by:

    1. Davide E Avino & Enrique Salvador, 2024. "Contingent Claims and Hedging of Credit Risk with Equity Options," The Review of Asset Pricing Studies, Society for Financial Studies, vol. 14(2), pages 310-348.
    2. Da‐Hea Kim, 2022. "Investment horizon and option market activity," Journal of Futures Markets, John Wiley & Sons, Ltd., vol. 42(5), pages 923-958, May.
    3. Caporale, Guglielmo Maria & Kyriacou, Kyriacos & Spagnolo, Nicola, 2023. "Aggregate insider trading and stock market volatility in the UK," Journal of International Financial Markets, Institutions and Money, Elsevier, vol. 89(C).
    4. Czech, Robert & Della Corte, Pasquale & Huang, Shiyang & Wang, Tianyu, 2022. "FX option volume," Bank of England working papers 964, Bank of England.
    5. Ibrahim Ekren & Brad Mostowski & Gordan v{Z}itkovi'c, 2022. "Kyle's Model with Stochastic Liquidity," Papers 2204.11069, arXiv.org.
    6. Akey, Pat & Grégoire, Vincent & Martineau, Charles, 2022. "Price revelation from insider trading: Evidence from hacked earnings news," Journal of Financial Economics, Elsevier, vol. 143(3), pages 1162-1184.
    7. Augustin, Patrick & Brenner, Menachem & Grass, Gunnar & Orłowski, Piotr & Subrahmanyam, Marti G., 2023. "Informed options strategies before corporate events," Journal of Financial Markets, Elsevier, vol. 63(C).
    8. Christian Keller & Michael C. Tseng, 2023. "Arrow-Debreu Meets Kyle: Price Discovery Across Derivatives," Papers 2302.13426, arXiv.org, revised Nov 2024.

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