**Underlying Asset Performance:** The primary driver is the performance of the assets held within the fund. If the fund invests in stocks, bonds, or other instruments, their price fluctuations directly impact the fund's net asset value (NAV).

**Market Conditions:** Broader economic and market trends influence investor sentiment and the overall performance of the fund's investments. Bull markets tend to increase NAV, while bear markets typically decrease it.

**Interest Rates:** Changes in interest rates can affect the value of fixed-income securities held by the fund, especially if the fund invests heavily in bonds.

**Fund Management Fees:** The fees charged by the fund's management company reduce the fund's returns, thereby affecting its price over time.

**Supply and Demand:** While less significant than other factors for established funds, imbalances between investor demand to buy and sell shares can create temporary price fluctuations.

**Currency Fluctuations:** If the fund invests in assets denominated in currencies other than the fund's base currency, exchange rate movements can impact the fund's returns when translated back to the base currency.

**Fund Expenses:** Other operational costs like custodian fees and administrative expenses can eat into the fund's returns.