Stock-return volatility and intraday equity trading by investor types in Thailand
Post by MSF Chula at Monday, 24 December 2018 11:53 AM

I examine the intraday stock-return volatility pattern and relationship between the volatility and intraday trading by individual, institutional, foreign and proprietary investors in the Stock Exchange of Thailand. The volatility pattern of SET100 during January 2010 through December 20161 follows the L-shape in the morning and muted U-shape the afternoon session which is consistent with findings from many stock markets around the world. For large-size stocks, the net purchase of informed (institutional and foreign) investors with the net sale of less-informed (individual) investor drive the positive volatility effect. This result is always significant; however, cannot be explained by information-based explanation but rather more aligned with liquidity-driven explanation. For small stocks, the net proprietary trading has an increasing impact on volatility, which is consistent with liquidity pressure explanation. This result is significant and robust to different size of the portfolio and different measure of the volatility after controlling for lagged volatilities, number of trades, average trade size, opening, closing and Monday effect.

Last updated at Monday, 24 December 2018 11:53 AM