Underlying Index Performance: The primary driver is the performance of the underlying index tracked by the ETF. If the index rises, the ETF price generally increases, and vice-versa.

Supply and Demand: Market forces of supply and demand for the ETF shares influence its price. Higher demand tends to push the price up, while increased selling pressure can lower it.

Net Asset Value (NAV): The NAV reflects the total value of the ETF's holdings minus liabilities, divided by the number of outstanding shares. The ETF price usually trades close to its NAV.

Premium/Discount: The difference between the ETF's market price and its NAV is called the premium or discount. Arbitrage activities help keep this difference minimal.

Investor Sentiment: Overall market sentiment and investor confidence can impact ETF prices. Positive sentiment often leads to increased buying, driving prices higher.

Economic Conditions: Macroeconomic factors like interest rates, inflation, and GDP growth can influence the valuations of companies within the underlying index, thereby affecting the ETF price.