Underlying Asset Performance: The primary driver is the performance of the assets the ETF holds. If the component stocks rise, the ETF's price generally increases.

Supply and Demand: Market demand for the ETF units influences its price. Higher demand typically pushes the price up, while increased selling pressure can lower it.

Net Asset Value (NAV): The NAV, representing the total value of the ETF's holdings divided by outstanding shares, serves as a benchmark. The market price usually stays close to the NAV.

Expense Ratio: While not a direct price determinant, the expense ratio impacts long-term returns. Higher fees can slightly detract from overall performance compared to similar lower-cost ETFs.

Market Sentiment: Overall market optimism or pessimism can impact ETF prices, particularly for ETFs tracking broad market indexes.

Currency Fluctuations: For ETFs holding international assets, currency exchange rates can affect returns when converted back to the local currency.

Tracking Error: This refers to the difference between the ETF's performance and the performance of its underlying index. Higher tracking error can affect investor perception and price.

Index Changes: Changes in the composition of the underlying index (e.g., stocks being added or removed) can lead to price adjustments as the ETF rebalances its portfolio.