Market Sentiment: Broad market optimism or pessimism can influence demand for low-volatility ETFs like USMV, as investors seek safer havens during downturns or chase higher growth in bullish periods.

Interest Rates: Changes in interest rates can affect the attractiveness of USMV relative to bonds and other fixed-income assets. Rising rates might make bonds more appealing, potentially reducing demand for USMV.

Volatility Levels: Paradoxically, increased market volatility can sometimes decrease USMV's price temporarily. As volatility spikes, broader market indexes may decline sharply, pulling down even low-volatility stocks included in USMV.

Index Methodology: The specific methodology used to construct the underlying index (MSCI USA Minimum Volatility Index) impacts USMV. Adjustments to the methodology or rebalancing of the index can affect constituent stock allocations and, therefore, the ETF's price.

Economic Data: Economic indicators such as GDP growth, inflation, and employment figures influence overall market sentiment and investor risk appetite, indirectly affecting USMV's price. Strong economic data might lead to a shift away from low-volatility strategies.

Fund Flows: Significant inflows or outflows of capital into or out of USMV can impact its price due to supply and demand dynamics. Large outflows could necessitate the fund selling underlying holdings, potentially driving down the price.

Constituent Stock Performance: The individual performance of the stocks held within USMV's portfolio directly influences the ETF's overall value. Positive performance of key holdings can boost the ETF's price.