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Informed Trading in the Stock Market and Option-Price Discovery

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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. Christian Keller & Michael C. Tseng, 2023. "Arrow-Debreu Meets Kyle: Price Discovery for Derivatives," Papers 2302.13426, arXiv.org, revised Mar 2024.
    2. 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).
    3. Ibrahim Ekren & Brad Mostowski & Gordan v{Z}itkovi'c, 2022. "Kyle's Model with Stochastic Liquidity," Papers 2204.11069, arXiv.org.
    4. Czech, Robert & Della Corte, Pasquale & Huang, Shiyang & Wang, Tianyu, 2022. "FX option volume," Bank of England working papers 964, Bank of England.
    5. 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.
    6. 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).
    7. 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.

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