Underlying Asset Performance: CS9.PA's price largely mirrors the performance of its underlying assets, typically a specific index or basket of securities. Upward or downward movements in these assets directly impact the ETF's value.

Supply and Demand: Market forces play a role. High demand for CS9.PA can push its price up, while increased selling pressure can lower it. This is influenced by investor sentiment and overall market conditions.

Expense Ratio: The ETF's expense ratio, the annual fee charged to manage the fund, indirectly impacts its price. Higher expenses can slightly reduce returns over time, affecting its relative value compared to similar ETFs.

Tracking Error: Tracking error, the difference between the ETF's performance and its benchmark index, can affect its price. Lower tracking error usually means a more accurate reflection of the underlying asset's performance.

Currency Fluctuations: If CS9.PA holds assets denominated in a currency other than the Euro, exchange rate fluctuations can impact its price when converted back to Euro.