Underlying Index Performance: The primary driver is the performance of the underlying index it tracks. If the index rises, the ETF's price generally rises and vice versa.

Supply and Demand: Market demand for the ETF influences its price. Higher demand usually leads to a higher price, and vice versa.

Net Asset Value (NAV): The NAV, representing the total value of the underlying assets minus liabilities, is a key factor. The ETF price usually tracks the NAV closely.

Expense Ratio: The ETF's annual operating expense ratio affects returns. Higher expense ratios can slightly depress the ETF's price performance relative to its index.

Trading Volume and Liquidity: Higher trading volume indicates greater liquidity, which can lead to tighter bid-ask spreads and potentially more stable pricing.

Market Sentiment: Overall market sentiment, whether bullish or bearish, can impact the demand for and price of ETFs.

Currency Fluctuations: For ETFs holding assets denominated in foreign currencies, exchange rate changes can affect the ETF's price when expressed in the base currency (e.g., Euro).