Underlying Asset Performance: CU9.PA tracks an index. The ETF's price closely mirrors the performance of the assets within that index.

Supply and Demand: High demand relative to supply will increase the ETF's price, while increased supply and reduced demand will decrease it.

Net Asset Value (NAV): NAV is the total value of the ETF's holdings, divided by the number of outstanding shares. Market price tends to track NAV.

Investor Sentiment: Overall market optimism or pessimism can influence the demand for ETFs like CU9.PA, impacting its price regardless of underlying fundamentals.

Expense Ratio: While the expense ratio doesn't directly affect the *price*, higher expenses can make it less attractive compared to similar, lower-cost ETFs, indirectly affecting demand.

Currency Fluctuations: If the ETF holds assets denominated in a currency other than the trading currency, exchange rate changes will impact the ETF's price.

Index Reconstitution: Changes to the underlying index (additions or deletions of constituents) can lead to price adjustments as the ETF rebalances its portfolio.

Market Liquidity: Higher trading volumes and tighter bid-ask spreads usually indicate greater liquidity, leading to more efficient price discovery and potentially less price volatility.