Stock Manipulation

  • 详情 Proxy for Stock Market Manipulation and Its Implication in Pricing Mechanism: Empirical Ev
    Stock price manipulations may be an important clue for us to understand many unique phenomena related to Chinese stock market, but we can hardly find any literature like this due to the difficulty to measure manipulation. We chosen a manipulated sample consisted of 44 stocks which was penalized by security regulation authorities for manipulation and 30 stocks whose price declining 10% or more in at least 3 successive trading days which may be caused by the manipulator’s running-out-of-fund. We documented that the manipulated stocks have significantly higher shares per account, concentration ratio, tradable shares ratio, turnover ratio, and significantly lower number of tradable shares related to non-manipulated ones, manipulated stocks in Shanghai Security Exchange have significantly higher level of larger shareholder’s percentage, but in Shenzhen Security Exchange we found the reversal. Our empirical findings suggest that we can use such variables as proxies to measure the possible stock price manipulation in Chinese stock market. Furthermore, our empirical research about the relationship between the characteristics of manipulated stocks and the stock price movement revealed that the sub-sample with higher shares per account or concentration ratio prior to the price reached its maximum also have higher level of return, averaged annual return and averaged annual abnormal return, and after the price reached it’s maximum, shares per account and concentration ratio decline significantly