ProShares UltraShort S&P500(AMEX:SDS)

SDS provides a 1-day leveraged bet against the S&P 500 in a very liquid vehicle that's well-aligned with the tactical nature of the product. The fund, like most leveraged and inverse products, is designed to deliver 2x inverse exposure to its indexthe S&P 500for 1 day and 1 day only. Holding it for longer periods will expose investors to the performance drift resulting from compounding. As such, the tool should either be held for no more than 1 day or rebalanced regularly (adding or subtracting to one`s position in the fund) to offset these dynamics. In all, SDS provides the strong liquidity that`s paramount for a geared fund.