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Intraday Behavior of Stock Prices and Trades around Insider Trading

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  • A. Can Inci
  • Biao Lu
  • H. Nejat Seyhun

Abstract

Our evidence indicates that insiders’ trades provide significant new information to market participants and they are incorporated more fully in stock prices as compared to noninsiders’ trades. We find that market professionals do not front‐run insiders’ trades. Both insiders’ purchases and sales result in significant contemporaneous and subsequent price impact, while sales by large shareholders result in a contemporaneous stock price decline that is subsequently reversed. The arrival of insider purchases reverse the prevailing negative order imbalances from third party trades and lead to piggy‐backing by market professionals resulting in subsequent market purchase orders as well as stock price increases.

Suggested Citation

  • A. Can Inci & Biao Lu & H. Nejat Seyhun, 2010. "Intraday Behavior of Stock Prices and Trades around Insider Trading," Financial Management, Financial Management Association International, vol. 39(1), pages 323-363, March.
    • Handle: RePEc:bla:finmgt:v:39:y:2010:i:1:p:323-363
    DOI: 10.1111/j.1755-053X.2009.01075.x
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    3. Inci, A. Can, 2012. "Insider trading activity, tenure length, and managerial compensation," Global Finance Journal, Elsevier, vol. 23(3), pages 151-166.
    4. Aziz Simsir, Serif & Simsek, Koray D., 2022. "The market impact of private information before corporate Announcements: Evidence from Turkey," Journal of International Financial Markets, Institutions and Money, Elsevier, vol. 80(C).
    5. Gu, Dingwei & Liu, Xin & Sun, Hanwen & Zhao, Huainan, 2021. "Strategic insider trading: Disguising order flows to escape trading competition," Journal of Corporate Finance, Elsevier, vol. 67(C).
    6. A. Inci & H. Seyhun, 2012. "How do quotes and prices evolve around isolated informed trades?," Journal of Economics and Finance, Springer;Academy of Economics and Finance, vol. 36(2), pages 499-519, April.
    7. Berkman, Henk & Koch, Paul & Westerholm, P. Joakim, 2020. "Inside the director network: When directors trade or hold inside, interlock, and unconnected stocks," Journal of Banking & Finance, Elsevier, vol. 118(C).
    8. Kam C. Chan & Xuanyu Jiang & Donghui Wu & Nianhang Xu & Hong Zeng, 2020. "When Is the Client King? Evidence from Affiliated‐Analyst Recommendations in China's Split‐Share Reform," Contemporary Accounting Research, John Wiley & Sons, vol. 37(2), pages 1044-1072, June.
    9. Guglielmo Maria Caporale & Alex Plastun, 2020. "Abnormal Returns and Stock Price Movements: Some Evidence from Developed and Emerging Markets," CESifo Working Paper Series 8783, CESifo.
    10. Humphery-Jenner, Mark L., 2011. "Optimal VWAP trading under noisy conditions," Journal of Banking & Finance, Elsevier, vol. 35(9), pages 2319-2329, September.
    11. Guglielmo Maria Caporale & Alex Plastun, 2021. "Gold and oil prices: abnormal returns, momentum and contrarian effects," Financial Markets and Portfolio Management, Springer;Swiss Society for Financial Market Research, vol. 35(3), pages 353-368, September.

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