Underlying Asset Performance: ISIF.TO's price closely mirrors the performance of the underlying securities it holds, primarily S&P 500 index. Positive S&P 500 returns generally drive ISIF.TO upwards.

Currency Fluctuations: As ISIF.TO invests in US equities, currency fluctuations between Canadian and US dollars impact its price. A stronger US dollar versus the Canadian dollar boosts ISIF.TO's value and vice versa.

Supply and Demand: Market demand for ISIF.TO shares can influence its price. High demand might push the price above its net asset value, while increased selling pressure can lower it.

Expense Ratio: ISIF.TO has an expense ratio, which is deducted from the fund's assets, impacting its returns and, indirectly, its price. Higher expense ratios can slightly reduce overall performance.

Interest Rates: Changes in interest rates, especially in the US, can affect the valuations of companies within the S&P 500 and thus impact ISIF.TO. Higher rates may lead to decreased valuations.

Economic Conditions: Overall economic health, both in the US and globally, influences company earnings within the S&P 500, affecting investor sentiment and ISIF.TO's price.

Investor Sentiment: General market optimism or pessimism can significantly impact investment decisions, leading to increased buying or selling of ISIF.TO, thus affecting its price.

Dividend Payouts: Dividends paid by the companies within the S&P 500, while reinvested in the fund, contribute to its overall return and can influence investor demand and price.

Trading Volume and Liquidity: Higher trading volumes usually indicate greater liquidity, allowing large buy or sell orders to be executed without significantly affecting the price. Low liquidity can lead to price volatility.

Geopolitical Events: Global political events can influence investor confidence and market stability, indirectly impacting the S&P 500 and consequently ISIF.TO.