Inflation Expectations: Rising inflation expectations often push FNIIX.US's price down, as inflation erodes the real value of fixed-income securities.

Interest Rate Movements: Increases in interest rates typically cause bond prices to decrease, thus lowering FNIIX.US's NAV, as new bonds become more attractive.

Credit Risk: Perceived changes in the creditworthiness of issuers within the fund can influence its price; increased risk lowers the NAV.

Liquidity: Market liquidity influences trading prices. Lower liquidity can lead to wider bid-ask spreads and potentially affect the NAV.

Economic Growth: Stronger economic growth may lead to higher interest rates, negatively impacting bond prices in FNIIX.US. Conversely, slower growth might boost bond prices.

Federal Reserve Policy: Actions and communications from the Federal Reserve, especially concerning monetary policy, have a significant impact on interest rates and, subsequently, FNIIX.US.

Supply and Demand: Overall investor demand for Treasury Inflation-Protected Securities (TIPS), driven by factors like market sentiment and hedging strategies, impacts FNIIX.US's price.