Which types of investor investment flow affect Thailand Stock Market Index

Abstract

This study examines the effect of types of investor investment flow on Thailand Stock Market Index returns. Daily data on investment types, namely, foreign investors, institutional investors, proprietary investors, and retail investors from the Stock Exchange of Thailand for the period 2015 to 2020 is used. The results from the OLS model show that proprietary investors dominate the SET index. We also conduct a Granger causality test to understand the relationship between the SET index and investor investment flow. This study also examines the relation between SET volatility and investor behavior. The result shows that when the SET index has high volatility investors more actively participate in the market.