Strategy. The Index is provided by S&P Dow Jones Indices, LLC (the Index Provider) and is a modified equal-weighted index that is designed to measure the performance of the domestic companies included in the integrated oil and gas, oil and gas exploration and production and oil and gas refining and marketing sub-industries as classified by the Global Industry Classification Standards (GICS). The GICS classifications are determined primarily based on a companys revenues, however, earnings and market perception are also considered by GICS. The Index consists of constituents of the S&P Total Market Index (S&P TMI) that belong to the GICS sub-industries noted above that satisfy the following criteria: (1) have a float-adjusted market capitalization above $300 million with a float-adjusted liquidity … Show more… The Index is provided by S&P Dow Jones Indices, LLC (the Index Provider) and is a modified equal-weighted index that is designed to measure the performance of the domestic companies included in the integrated oil and gas, oil and gas exploration and production and oil and gas refining and marketing sub-industries as classified by the Global Industry Classification Standards (GICS). The GICS classifications are determined primarily based on a companys revenues, however, earnings and market perception are also considered by GICS. The Index consists of constituents of the S&P Total Market Index (S&P TMI) that belong to the GICS sub-industries noted above that satisfy the following criteria: (1) have a float-adjusted market capitalization above $300 million with a float-adjusted liquidity ratio (defined by dollar value traded over the previous 12 months divided by the float-adjusted market capitalization as of the Index rebalancing reference date) above 50%; have a float-adjusted market capitalization above $500 million with a float-adjusted liquidity ratio above 90%; or have a float-adjusted market capitalization above $400 million with a float-adjusted liquidity ratio above 150%; and (2) are U.S.-based companies. The market capitalization threshold may be relaxed to ensure that there are at least 22 stocks in the Index as of each quarterly rebalancing. As of December 31, 2024, the Index was comprised of 53 constituents which were concentrated in the energy sector, the GICS sector in which the oil and gas exploration and production industry was included. The components of the Index and the percentages represented by various sectors in the Index may change over time. The Fund will concentrate its investment in a particular industry or group of industries ( i.e. , hold 25% or more of its total assets in the stocks of a particular industry or group of industries) to approximately the same extent as the Index is so concentrated. The Fund, under normal circumstances, invests at least 80% of its net assets (plus borrowing for investment purposes) in financial instruments, such as swap agreements, securities of the Index, and exchange-traded funds ("ETFs") that track the Index, that, in combination, provide 2X daily leveraged exposure to the Index, consistent with the Fund's investment objective. The financial instruments in which the Fund most commonly invests are swap agreements and futures agreements which are intended to produce economically leveraged investment results. The Fund may invest in the securities of the Index, a representative sample of the securities in the Index that has aggregate characteristics similar to those of the Index, an ETF that tracks the Index or a substantially similar index, and derivatives, such as swaps or futures on the Index or on an ETF that tracks the same Index or a substantially similar index, that provide leveraged exposure to the above. The Fund seeks to remain fully invested at all times, consistent with its stated investment objective, but may not always have investment exposure to all of the securities in the Index, or its weighting of investment exposure to securities or industries may be different from that of the Index. In addition, the Fund may invest directly or indirectly in securities not included in the Index. In all cases, the investments would be designed to help the Fund track the Index. The Fund will attempt to achieve its investment objective without regard to overall market movement or the increase or decrease of the value of the securities in the Index. At the close of the markets each trading day, Rafferty rebalances the Funds portfolio so that its exposure to the Index is consistent with the Funds investment objective. The impact of the Indexs movements during the day will affect whether the Funds portfolio needs to be re-positioned. For example, if the Index has risen on a given day, net assets of the Fund should rise, meaning that the Funds exposure will need to be increased. Conversely, if the Index has fallen on a given day, net assets of the Fund should fall, meaning the Funds exposure will need to be reduced. This re-positioning strategy typically results in high portfolio turnover. On a day-to-day basis, the Fund is expected to hold ETFs and money market funds, deposit accounts with institutions with high quality credit ratings ( i.e ., investment grade or higher), and/or short-term debt instruments that have terms-to-maturity of less than 397 days and exhibit high quality credit profiles, including U.S. government securities and repurchase agreements. The Fund may lend securities representing up to one-third of the value of the Funds total assets (excluding the value of the collateral received). The terms daily, day, and trading day, refer to the period from the close of the markets on one trading day to the close of the markets on the next trading day. The Fund is non-diversified, meaning that a relatively high percentage of its assets may be invested in a limited number of issuers of securities. Additionally, the Funds investment objective is not a fundamental policy and may be changed by the Funds Board of Trustees without shareholder approval. Because of daily rebalancing and the compounding of each days return over time, the return of the Fund for periods longer than a single day will be the result of each days returns compounded over the period, which will very likely differ from 200% of the return of the Index over the same period. The Fund will lose money if the Index performance is flat over time, and as a result of daily rebalancing, the Indexs volatility and the effects of compounding, it is even possible that the Fund will lose money over time while the Indexs performance increases over a period longer than a single day. Show less