Underlying Asset Performance: The primary driver is the performance of the securities held within the ETF, directly mirroring its investment objective.

Supply and Demand: Market forces of buyers and sellers influence price. Higher demand pushes the price up, while increased selling pressure decreases it.

Expense Ratio: Although not directly setting the price, the expense ratio reduces returns over time, thus impacting its attractiveness and indirectly affecting value.

Market Sentiment: Overall investor mood and expectations about the market impact trading activity in the ETF and related assets.

Index Tracking Accuracy: How closely the ETF replicates its benchmark index affects its perceived value and therefore, its price.

Trading Volume and Liquidity: High trading volume usually means tighter bid-ask spreads and easier price discovery.

Economic Conditions: Macroeconomic factors like inflation, interest rates, and GDP growth affect the underlying assets' performance and investor sentiment.

Currency Fluctuations: If the ETF holds assets denominated in foreign currencies, changes in exchange rates will impact the ETF's price.

Geopolitical Events: Political instability or significant world events can trigger market volatility and alter investor risk appetite.

Regulatory Changes: New regulations affecting the underlying assets or the ETF structure itself can affect investor sentiment and thus, price.