Underlying Index Performance: The price of UMI-B.TO, an ETF tracking the Solactive US Big Data & Cloud Computing Index, is directly influenced by the performance of its underlying index. Positive index performance generally leads to an increase in the ETF's price, and vice versa. Supply and Demand: Like any traded security, the price of UMI-B.TO is affected by supply and demand. Higher demand relative to supply will push the price upward, while increased supply compared to demand will cause the price to fall. Net Asset Value (NAV): The NAV per share represents the total value of the ETF's holdings minus liabilities, divided by the number of outstanding shares. Market price tends to closely track NAV. Significant deviations could create arbitrage opportunities. Market Sentiment: Overall investor sentiment towards the technology sector, specifically big data and cloud computing, impacts UMI-B.TO's price. Positive sentiment typically drives prices higher, while negative sentiment can lead to price declines. Currency Fluctuations: Since UMI-B.TO invests in US-based companies, currency fluctuations between the Canadian dollar and the US dollar can affect its price. A stronger US dollar relative to the Canadian dollar will generally increase the ETF's price in Canadian dollar terms. Expense Ratio: While not a direct driver of price fluctuations, the ETF's expense ratio (the annual fee charged to manage the fund) reduces overall returns, indirectly impacting its price over the long term.