The MacroShares Major Metro Housing Down Trust’s (Ticker: DMM) underlying Value tracks three times the inverse cumulative percentage change in U.S. single-family home prices, as measured by the S&P/Case-Shiller Composite-10 Home Price Index. DMM is a paired trust (paired with MacroShares Major Metro Housing Up Trust – UMM) that work as follows: When MacroShares Major Metro Housing Down are created, an equal number of MacroShares Major Metro Housing Up are also created. DMM funds are invested in the “Major Metro Housing Down Trust. UMM investor funds are invested in a separate “Major Metro Housing Up Trust. Both trusts enter into a settlement contract to pledge assets to one another over time, using a predetermined formula. The trusts feature a 3x leverage factor, such that the underlying value of each is intended to track three times the cumulative percentage change, upward or downward, in U.S. single family home prices, as measured by the S&P/Case-Shiller Composite-10 Home Price Index.