Insider trading in family firms: evidence from Thailand

Abstract

This study examines the profitability of corporate insider trading in Thailand's stock market and whether the abnormal return depends on the company's characteristics and insider characteristics. The result shows that there is a significant abnormal return on corporate insider trading transactions. The difference in ownership structure is also important, with the results supporting that insider trading by family firms is more profitable than non-family firms. Moreover, the finding indicates that the trading of CEOs has more valuable information about the company's prospects than other insiders.