Inflation: Higher inflation erodes the value of future fixed income payments, pushing bond prices down and yields up.

Interest Rates: When interest rates rise, newly issued bonds become more attractive, decreasing the demand for older bonds like those held in THYYX.US, leading to price declines.

Credit Risk: Increased concerns about the ability of bond issuers to repay their debts can negatively impact the fund's net asset value (NAV).

Economic Growth: Strong economic growth can lead to higher inflation expectations, prompting the Federal Reserve to raise interest rates, which can decrease bond prices.

Market Sentiment: Investor risk appetite influences demand for bond funds. During "risk-on" periods, investors may shift towards riskier assets like stocks, putting downward pressure on bond prices.

Federal Reserve Policy: Actions by the Federal Reserve, such as quantitative tightening or changes to the federal funds rate, significantly affect bond yields and therefore THYYX.US price.