Fund Performance: FSBZXX.US's price, or net asset value (NAV), is directly tied to the performance of the underlying securities it holds. Strong returns in its investments will generally lead to price increases.

Market Conditions: Overall market sentiment, economic conditions, and industry-specific trends can influence the prices of the securities held by FSBZXX.US, thereby impacting its NAV.

Interest Rates: As a bond fund, FSBZXX.US is sensitive to interest rate changes. Rising interest rates typically cause bond prices, and thus the fund's NAV, to decrease.

Credit Risk: The creditworthiness of the issuers of the bonds held by FSBZXX.US impacts its price. Downgrades in credit ratings or defaults can lead to losses and a lower NAV.

Fund Flows: Significant inflows or outflows of money into or out of FSBZXX.US can affect its price, especially if the fund has to buy or sell assets quickly to accommodate these flows.

Inflation: Inflation erodes the purchasing power of fixed income investments. High inflation can lead to lower bond prices and a decreased NAV for FSBZXX.US.

Expense Ratio: The fund's expense ratio, which covers management fees and operating costs, can indirectly affect its price. Higher expenses can reduce the overall return and potentially limit price appreciation.