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

Supply and Demand: High demand can push the ETF price above its net asset value (NAV), creating a premium. Conversely, high selling pressure can cause a discount.

NAV: The net asset value, reflecting the total value of the ETF's holdings minus liabilities, is a key benchmark for its fair price. Significant divergences can trigger arbitrage.

Market Sentiment: Overall market optimism or pessimism towards the sectors represented in the ETF can influence its price, even if the underlying assets haven't changed dramatically.

Expense Ratio: While not a direct price driver, a higher expense ratio can slightly dampen returns over time compared to similar ETFs with lower fees.

Trading Volume: Higher trading volume usually leads to tighter bid-ask spreads and more efficient price discovery, reducing the impact of large orders.

Arbitrage Activity: Arbitrageurs exploit price differences between the ETF and its underlying assets, ensuring that the ETF price stays relatively close to its NAV.