Underlying Index Performance: The primary driver is the performance of the index it tracks. If the underlying stocks rise, the ETF's price generally increases, and vice-versa. Supply and Demand: Like any traded security, supply and demand affect its price. High demand pushes prices up, while increased selling pressure can lower them. Net Asset Value (NAV): The NAV, representing the total value of the ETF's holdings minus liabilities, is a key benchmark. Significant deviations between the market price and NAV can create arbitrage opportunities, bringing the price closer to NAV. Market Sentiment: Overall market sentiment, including investor confidence and economic outlook, can influence trading activity and impact the ETF's price. Fund Flows: Large inflows or outflows of money from the ETF can affect its price, especially in less liquid markets. Tracking Error: Imperfect tracking of the underlying index can lead to price discrepancies. Factors such as management fees and sampling techniques can contribute to tracking error.