Underlying Index Performance: The price of IVVB.US heavily depends on the performance of its underlying index, the iShares Core S&P 500 UCITS ETF USD, which tracks the S&P 500. Higher S&P 500 values lead to increased IVVB.US prices.

Currency Exchange Rates: As IVVB.US likely trades in a different currency than the underlying assets, fluctuating exchange rates, specifically between the USD and the trading currency, can impact its price. A stronger USD increases the price.

Supply and Demand: General market supply and demand for IVVB.US ETF shares directly influence its price. Higher demand, coupled with limited supply, increases the price, and vice versa.

Investor Sentiment: Broad investor optimism or pessimism regarding the US stock market significantly affects IVVB.US's price. Positive market sentiment drives the price up.

Expense Ratio and Management Fees: Although the impact is usually small daily, the fund's expense ratio affects the total return over time, thus influencing its price relative to the underlying index.

Economic Indicators: Macroeconomic indicators, such as GDP growth, inflation, interest rates, and unemployment figures in the US, impact the S&P 500 companies' performance, consequently affecting IVVB.US's price.

Dividend Payments: IVVB.US distributes dividends received from the S&P 500 companies. Dividend payments might cause small price adjustments around ex-dividend dates.

Political and Geopolitical Events: Major political events, policy changes, and geopolitical tensions impacting the US or global economy can trigger volatility and affect IVVB.US's price.