Underlying Index Performance: The BSET100.BK ETF tracks the SET100 index, so its price is directly affected by the overall performance of the index constituents.

Supply and Demand: Market forces of supply and demand for the ETF units influence its price. Higher demand tends to increase the price, while increased supply can lower it.

Investor Sentiment: General market sentiment and investor confidence in the Thai stock market and the companies within the SET100 index impact ETF prices.

Economic Conditions: Macroeconomic factors like inflation, interest rates, and economic growth in Thailand can indirectly affect the prices of the underlying stocks and therefore the ETF.

Currency Fluctuations: Exchange rate changes between the Thai Baht and other currencies can influence the ETF's price, especially for international investors.

Dividend Payments: Dividends paid by the constituent stocks in the SET100 can affect the ETF price as it reflects the income generated by the underlying assets.