Herding behavior ,case of listed companies in Thailand

Abstract

We examine herding behavior in the Thailand stock market under different market conditions, industries, firm sizes, and investor types. We also study herding behavior during the Covid19 period. Lastly, we further develop a new factor that is a qualified price-risk element for stock return. The results show evidence of herding behavior in the Thailand stock market during the extreme positive and negative markets condition. And the herding behavior exists in twenty sectors out of twenty-six. The small-cap portfolio shows a greater magnitude of herding behavior compares with a large-cap portfolio. During the covid19 period, the result indicates herding behavior is more severe than usual. We further suggest the new risk factor in the Carhart four-factor model.