Underlying Asset Performance: The ETF's price closely tracks the performance of the underlying assets it holds, changes in their value directly impact the ETF's price.

Supply and Demand: Market forces of supply and demand for the ETF shares themselves influence its price, high demand can drive up the price, while increased selling pressure can lower it.

Market Sentiment: Overall investor sentiment towards the asset class or region the ETF tracks affects demand, positive sentiment increases demand and price, negative sentiment decreases them.

Expense Ratio: The ETF's expense ratio, while not directly impacting daily price fluctuations, affects its long-term performance and relative attractiveness to investors compared to similar ETFs.

Tracking Error: How closely the ETF mirrors the performance of its benchmark index matters, higher tracking error can make it less desirable, potentially affecting its price.

Currency Fluctuations: If the ETF holds assets denominated in a foreign currency, exchange rate fluctuations between that currency and the Euro can impact the ETF's Euro-denominated price.

Interest Rates: Changes in interest rates can indirectly affect the attractiveness of the assets held by the ETF, thus impacting the ETF's price, for example, higher rates might make fixed income assets more appealing.

Liquidity: The liquidity of the ETF in the market, as measured by trading volume and bid-ask spreads, can influence its price, less liquid ETFs may experience wider price swings.