USCF tracks an index of large- and midcap companies from the US. Companies with the highest positive cash flow yield, over a period of three years, are eligible for inclusion in the fund. These eligible firms are then ranked according to next years estimated cash flow yield, estimated using a proprietary regression model. The top 75 companies according to this metric are selected for the index. Each share is weighted by their free-float market cap, up to a cap of 5%. Rebalancing is done semi-annually in May and November.