Underlying Index Performance: The ETF's price closely tracks the performance of the underlying index it replicates. Positive index movements generally lead to ETF price increases, and vice-versa.

Supply and Demand: Market demand for the ETF influences its price. High demand can push the price above its net asset value (NAV), while increased selling pressure can lower it.

Net Asset Value (NAV): The NAV is the per-share value of the ETF's holdings. Market prices tend to stay close to the NAV, but deviations can occur due to supply and demand imbalances.

Trading Activity: High trading volumes can lead to price volatility, especially during periods of market uncertainty.

Market Sentiment: Overall investor sentiment towards the sector or asset class represented by the ETF can significantly impact its price.

Expense Ratio: While it doesn't directly affect the daily price fluctuations, a higher expense ratio can slightly reduce the long-term returns and relative attractiveness compared to similar ETFs.