Underlying Index Performance: BUL.US is leveraged, so its price is highly sensitive to the daily performance of its underlying index, the Solactive US Daily Target Bull 2x Index.

Leverage Factor: BUL.US employs a 2x leverage factor, magnifying both gains and losses of the underlying index on a daily basis.

Trading Costs: Management fees, brokerage commissions, and other trading costs can erode returns and influence the ETF's price.

Supply and Demand: Market forces of supply and demand, driven by investor sentiment, trading activity, and market trends, directly affect the price of BUL.US.

Interest Rates: Changes in interest rates can impact the cost of borrowing associated with the leverage, affecting the ETF's profitability and price.

Volatility: Higher volatility in the underlying index can lead to greater price swings in BUL.US due to its leveraged nature, potentially attracting speculative traders.

Index Composition Changes: Changes in the composition of the Solactive US Daily Target Bull 2x Index can indirectly influence the ETF's performance and price.

Time Decay: Due to the daily rebalancing required to maintain its leverage, BUL.US experiences time decay, which can erode its value over longer periods, especially in volatile or sideways markets.