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Stock manipulation and its effects: pump and dump versus stabilization

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  • Yu Huang
  • Yao Cheng

Abstract

This study examines the manipulation of stock prices in Taiwan stock markets. Using a new set of hand-collected data, we examine the characteristics and patterns of manipulated stocks and their effects on the market. Our results show that manipulated firms tend to be small and to have poor corporate governance. Most manipulation cases involve a “pump-and-dump” trading strategy and stabilization operations. Pump-and-dump manipulations lead to high temporary price impacts, increased volatility, large trading volumes, short-term price continuation, and long-term price reversals during the manipulation period. They therefore have an important impact on market efficiency. In stabilization cases, the manipulation has no impact on market performance, except that the price drop and abnormal returns of the post-manipulation period are significantly lower than during the pre-manipulation period. Firm fundamentals are important in deciding the price impacts of stock manipulation. Compared with manipulated firms with positive fundamentals, the manipulation of firms with negative fundamentals has a more detrimental effect on market efficiency. Copyright Springer Science+Business Media New York 2015

Suggested Citation

  • Yu Huang & Yao Cheng, 2015. "Stock manipulation and its effects: pump and dump versus stabilization," Review of Quantitative Finance and Accounting, Springer, vol. 44(4), pages 791-815, May.
    • Handle: RePEc:kap:rqfnac:v:44:y:2015:i:4:p:791-815
    DOI: 10.1007/s11156-013-0419-z
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    More about this item

    Keywords

    Stock manipulation; Market performance; Pump and dump; Stabilization; G14; G15; G18;
    All these keywords.

    JEL classification:

    • G14 - Financial Economics - - General Financial Markets - - - Information and Market Efficiency; Event Studies; Insider Trading
    • G15 - Financial Economics - - General Financial Markets - - - International Financial Markets
    • G18 - Financial Economics - - General Financial Markets - - - Government Policy and Regulation

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