Underlying Assets: CBU8.XETRA tracks an index. The performance of the assets within that index directly impacts the ETF's Net Asset Value (NAV) and subsequently, its price.

Supply and Demand: Increased buying pressure pushes the price up, while higher selling pressure decreases it. Market sentiment surrounding the underlying assets influences this.

Index Changes: Rebalancing or changes to the underlying index holdings can affect the ETF's composition and potentially its price as it adjusts to mirror the new index.

Expense Ratio: The ETF's operating costs are indirectly reflected in its price as they reduce the fund's overall returns, though this is a minor factor.

Currency Fluctuations: If the underlying assets are denominated in a different currency, exchange rate movements can impact the ETF's price when converted to the trading currency.

Market Conditions: Broad market trends (bull or bear markets), economic news, and geopolitical events can influence investor sentiment and impact the overall demand for the ETF.