Underlying Index Performance: The ETF's price primarily mirrors the performance of the index it tracks. Rising index values usually lead to increased ETF prices, and vice versa.

Supply and Demand: High demand for the ETF tends to push its price up, while increased selling pressure can drive it down.

Net Asset Value (NAV): The NAV, reflecting the collective value of the ETF's holdings, serves as a fundamental benchmark for its fair price. Deviations between the ETF price and NAV can create arbitrage opportunities.

Market Sentiment: Overall investor optimism or pessimism in the market can impact the demand and, consequently, the price of the ETF.

Trading Volume: High trading volume generally indicates strong investor interest and liquidity, which can influence price discovery.

Expense Ratio: Although the expense ratio doesn't directly cause price fluctuations, a higher ratio can reduce the ETF's overall return, potentially affecting its attractiveness to investors.

News and Events: Significant news events or announcements related to the underlying index or the broader market can trigger price movements.

Foreign Exchange Rates: Fluctuations in foreign exchange rates can impact the ETF's price if its holdings are denominated in foreign currencies.

Fund Flows: Inflows of capital into the ETF can increase demand, while outflows can exert downward pressure on the price.