Market Interest Rates: Rising rates typically decrease bond values, as newly issued bonds offer higher yields, making older, lower-yielding bonds (like those in FMIYX.US) less attractive.

Credit Quality of Holdings: Downgrades in the credit ratings of bonds held within the fund can negatively impact its price, reflecting increased risk of default.

Overall Economic Conditions: Economic growth often leads to higher interest rates and inflation, which can depress bond prices within the fund.

Inflation Expectations: Higher inflation expectations erode the real return of fixed-income investments, potentially lowering the fund's price.

Fund's Expense Ratio: Higher expense ratios can reduce the overall return of the fund, indirectly affecting its attractiveness and potentially its price.

Supply and Demand: Investor demand for fixed-income investments and the specific fund itself can influence its price. High demand pushes prices up, and vice versa.

Maturity of Bond Holdings: Longer-maturity bonds are generally more sensitive to interest rate changes, affecting the fund's price more significantly than shorter-maturity bonds.