Underlying Asset Performance: The primary driver is the performance of the underlying assets tracked by the ETF, reflecting the changes in their market values.

Supply and Demand: Market dynamics of the ETF itself, including investor buying and selling pressures, directly influence its price.

Index Composition Changes: Adjustments made to the underlying index, such as additions or deletions of constituents, can affect the ETF's price.

Market Sentiment: Overall investor mood and prevailing market trends impact the demand for and valuation of the ETF.

Tracking Error: The difference between the ETF's performance and the underlying index's performance can influence its market price.

Expense Ratio and Fees: The management fees and operating expenses charged by the ETF can erode returns and impact its price over time.

Trading Volume and Liquidity: High trading volume and liquidity usually result in tighter bid-ask spreads and more efficient price discovery.

Economic Conditions: Macroeconomic factors like interest rates, inflation, and economic growth can broadly affect market valuations and ETF prices.