Underlying Index Performance: UXI.US tracks an index. The ETF's price heavily relies on the performance of the underlying securities within that index. If the index goes up, UXI.US generally rises, and vice versa.

Supply and Demand: Basic economics apply. Higher demand for UXI.US shares pushes the price up, while increased selling pressure (supply) lowers the price.

Expense Ratio: Although not directly affecting the daily price fluctuations, a higher expense ratio can impact long-term returns, making it less attractive compared to similar, cheaper ETFs.

Trading Volume: Higher trading volume typically indicates greater liquidity. Illiquidity can lead to wider bid-ask spreads, making it potentially costlier to buy or sell UXI.US shares.

Investor Sentiment: Overall market sentiment towards the assets held by the underlying index influences investor behavior. Positive sentiment can drive buying, while negative sentiment can trigger selling.

Economic Conditions: Macroeconomic factors like interest rates, inflation, and economic growth can impact the performance of the companies in the underlying index, thus affecting UXI.US's price.

News and Events: Company-specific news (if the underlying index focuses on specific companies) or major events affecting the sectors or regions represented in the index can cause price volatility.