Underlying Assets Performance: The price of HIWS.PA is primarily determined by the performance of the stocks comprising the Solactive US Big Cap Software Index NTR. Positive or negative movements in these stock prices directly impact the ETF's value. Supply and Demand: Market demand for HIWS.PA shares relative to the supply of available shares also influences its price. Higher demand tends to push the price up, while increased supply can lower it. Expense Ratio & Trading Costs: The ETF's expense ratio, reflecting management fees, and trading costs influence its overall returns and indirectly the price, as higher costs reduce investor attractiveness. Currency Exchange Rates: As the underlying assets are primarily US-based software companies, fluctuations in the EUR/USD exchange rate can affect the ETF's price for Eurozone investors. Index Tracking Efficiency: How closely HIWS.PA replicates the performance of its benchmark Solactive US Big Cap Software Index NTR affects its value. Tracking error can lead to deviations.