Underlying Asset Performance: The primary driver is the performance of the underlying assets the ETF tracks, which is typically a specific index or basket of stocks. If the underlying assets increase in value, the ETF's price generally rises, and vice versa.

Supply and Demand: Market forces of supply and demand for the ETF shares themselves influence the price. Higher demand can push the price up, while increased selling pressure can lead to a price decrease.

Net Asset Value (NAV): The NAV, calculated daily, represents the total value of the ETF's assets minus liabilities, divided by the number of outstanding shares. The ETF price should theoretically track the NAV closely.

Trading Costs & Fees: Management fees, brokerage commissions, and other trading costs can impact the overall return and indirectly affect the ETF's attractiveness and price.

Market Sentiment: Overall investor confidence and market sentiment toward the asset class the ETF represents can influence buying and selling activity, thereby impacting the ETF's price.

Arbitrage Activity: Arbitrageurs play a role in keeping the ETF price aligned with its NAV. They capitalize on price discrepancies by buying/selling the ETF and the underlying assets simultaneously, reducing price deviations.

Economic Conditions: Broader economic factors such as interest rates, inflation, and GDP growth can impact investor sentiment and the performance of the underlying assets, consequently affecting the ETF's price.

Currency Fluctuations: If the ETF invests in assets denominated in a foreign currency, fluctuations in exchange rates can affect the ETF's price when converted back to the local currency.