Index Performance: ISPA.MU tracks the S&P 500, so its price largely mirrors the index's movements. Upward trends in the S&P 500 generally increase ISPA.MU's price.

Supply and Demand: High demand for ISPA.MU shares, driven by investor interest, can push its price up. Conversely, increased selling pressure can lead to a price decline.

Economic Conditions: Broad economic factors like GDP growth, inflation, and interest rates influence investor sentiment and, consequently, the S&P 500's and ISPA.MU's price.

Currency Fluctuations: As a Euro-denominated ETF tracking a USD-denominated index, currency exchange rates (EUR/USD) can affect ISPA.MU's price. A stronger Euro reduces the ETF's relative price.

Expense Ratio: ISPA.MU's expense ratio, though small, slightly reduces its returns compared to the underlying index. Higher expense ratios can have slightly negative impact.

Investor Sentiment: General market optimism or pessimism significantly influences investment decisions, affecting demand for ETFs like ISPA.MU and thereby its price.

Dividend Payouts: While ISPA.MU distributes dividends, these payouts can lead to small price adjustments. The ex-dividend date might show a slight price decrease as the dividend is removed from the asset value.