Underlying Asset Performance: The SP5C.PA ETF tracks the S&P 500 index. Thus, the price is heavily influenced by the collective performance of the 500 largest U.S. companies within that index.

Supply and Demand: Increased buying pressure will typically drive the SP5C.PA price higher, while increased selling pressure will push it lower. This is a basic principle of market economics.

Market Sentiment: Overall investor confidence or fear can impact demand for the SP5C.PA ETF. Positive economic outlooks generally increase investment, negative events decrease it.

Currency Fluctuations: Since SP5C.PA is traded in Euros, changes in the EUR/USD exchange rate can influence its price. A stronger Euro makes U.S. assets relatively cheaper for Eurozone investors.

Expense Ratio and Tracking Error: While not direct price drivers, the ETF's expense ratio and how closely it replicates the S&P 500's performance (tracking error) can affect its attractiveness and therefore indirectly affect its price.

Interest Rates: Changes in interest rates can influence the attractiveness of equities compared to bonds. Rising interest rates can make bonds more appealing and potentially reduce demand for SP5C.PA.