Underlying Index Performance: FMAR.US tracks the performance of a specific index of U.S. stocks. The price will fluctuate based on the overall performance of the stocks within that index.

Supply and Demand: Basic supply and demand principles apply. Higher demand for the ETF generally pushes the price up, while increased selling pressure can lower it.

Market Sentiment: Overall investor sentiment towards the U.S. stock market significantly impacts the ETF's price. Optimism typically drives prices higher, while pessimism can lead to declines.

Expense Ratio: The ETF's expense ratio, the annual fee charged to manage the fund, indirectly affects its price as it reduces returns over time.

Interest Rates: Changes in interest rates can influence the valuation of companies within the underlying index, thus affecting the ETF's price. Higher rates might pressure growth stocks, while lower rates can boost them.