The Thailand Stock Exchange Index fell by 1.55% in the morning.
Since the beginning of the year, foreign investors have sold Thai stocks worth over 157.84 billion baht.
Shares of PTT Oil and Retail Business dropped below their IPO price of 18 baht per share, trading at 17.90 baht during morning trading.
This is the first time the shares have fallen below the IPO price since they started trading on the SET in February 2021.
In addition, the dollar continues to strengthen, with the exchange rate at 37.142 baht per 1 dollar as of 10 a.m.