Volatility of Energy Sector Stocks: SDD.US is an inverse ETF, its value moves oppositely to the energy sector. Higher volatility in energy stocks, especially those heavily weighted, can lead to significant price swings in SDD.US.

Crude Oil Prices: Since energy stocks are correlated with crude oil prices, fluctuations in oil prices can greatly affect SDD.US. Rising oil prices typically depress SDD.US, while falling prices boost it.

Interest Rates: Interest rate changes impact the overall market and can affect energy stock valuations, indirectly influencing SDD.US.

Market Sentiment: General investor optimism or pessimism towards the energy sector plays a key role. Negative sentiment drives investors away from energy, increasing demand and price of SDD.US.

ETF Management Fees: SDD.US has management fees that can erode returns. Higher fees translate to lower overall value for investors, slightly depressing the ETF's price over time.

Rebalancing Costs: The fund incurs costs associated with rebalancing its portfolio to maintain its inverse relationship with the energy sector, impacting overall returns and value.

Supply and Demand: Like any ETF, the basic principles of supply and demand apply. Higher demand, relative to supply, causes the ETF's price to increase.