This study investigates the effect of corporate governance and trading behaviour of various investor types (local retail, local institution and foreign investors) in Thai capital market. By extending the probability of information-based trading (PIN) model by Easley et al. (1998), the study estimates the uninformed arrival rates for each types of investor. Using a sample of firms listed on Stock Exchange of Thailand during 2000-2007, the result shows that there is a positive relation between the corporate governance level and the arrival rates of uninformed trader for local institution and foreign investors. However, there is no association between the corporate governance level and the arrival rate of uninformed local retail investors. These results are confirmed by the associations between the initiated trades and the corporate governance level for these investor types. Overall the results of the study are consistent with the notion that institutional and foreign investors do pay attention to corporate governance of a firm in their trading while retail investors do not
