Performance of Underlying Assets: JNTNX.US's price is significantly impacted by the performance of the assets it holds, primarily US Treasury securities. Rising Treasury yields often lead to lower fund prices and vice versa.

Interest Rate Movements: Changes in prevailing interest rates, especially those set by the Federal Reserve, directly influence the fund's value. Higher interest rates typically decrease the value of existing Treasury bonds.

Inflation Expectations: Anticipated inflation rates can alter the perceived value of Treasury bonds. Higher inflation expectations tend to decrease the value as the real return on these bonds diminishes.

Economic Growth: Strong economic growth can lead to higher interest rates, negatively affecting Treasury bond prices. Conversely, economic slowdowns may lead to lower rates and increased bond values.

Credit Risk Perception: Although US Treasuries are considered very low risk, changes in the perceived creditworthiness of the US government (however unlikely) could impact the fund's price.