Fund Performance: TWUSX.US's historical returns and relative performance compared to its benchmark index or peer group directly impact investor demand and thus, its price.

Market Conditions: Overall market sentiment, economic indicators (like interest rates and inflation), and geopolitical events influence investor risk appetite and fund flows.

Asset Allocation: The fund's strategic allocation across different asset classes (stocks, bonds, etc.) and sectors affects its sensitivity to market fluctuations.

Management Expertise: The fund manager's investment strategy, stock-picking skills, and ability to navigate market volatility play a crucial role in the fund's performance.

Expense Ratio: The fund's expense ratio (management fees, operating expenses) directly impacts investor returns, influencing its attractiveness.

Fund Flows: Inflows of new capital into the fund can increase its asset size and potentially its price, while outflows can have the opposite effect.