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The S&P 500 Index is a widely used measure of large-cap U.S. stock market performance. It is a representative sample of important companies in leading industries. Companies are selected for inclusion in the index based on a variety of factors, such as adequate liquidity, appropriate market capitalization, financial viability, and the size of the public float.

Rydex and ProFunds mutual funds that track the S&P 500 index are listed below. Some of these funds track the S&P 500 index with a gearing of 200%. This means that the funds will gain 2%, if the S&P 500 index moves up 1%.

• Rydex S&P 500 - RYSPX. Provides investment results that match the performance of the S&P 500 index. Fund Inception date - May 31,2006.
• Rydex Dynamic S&P 500 - RYTNX. Provides investment results that correlate to 200% of the S&P 500 indexes's performance. Inception date - May 19, 2000.
• UltraBull ProFund - ULPIX. Correspond to twice (200%) the daily performance of the S&P 500 Index.

• Rydex Inverse S&P 500 Fund - RYURX. Performs in reverse to the S&P 500 Index. Was created in January 07, 1994.
• Rydex Inverse Dynamic S&P 500 Fund - RYTPX. Designed to correspond to 200% of the inverse performance of the index. Created in 2000. Inception date is May19, 2000.
• UltraBear ProFund - URPIX. Correspond to twice (200%) the inverse (opposite) of the daily performance of the S&P 500 Index.