This study attempts to address two research questions on the idiosyncratic return volatility and stock price informativeness. First, whether idiosyncratic return volatility is a valid proxy for stock price informativeness in emerging markets, and if it is, whether there exists a monotonic relationship between the idiosyncratic return volatility and stock price informativeness throughout the whole sample. We find that the idiosyncratic return volatility reflects the stock price informativeness in China. However, such a relationship does not exist in a monotonic fashion. These results indicate that idiosyncratic return volatility serves as an information measure, but must be used with caution.
Insider Trading Laws and Stock Price Informativeness
