The MSCI USA Energy Index is based on the MSCI USA Index (Parent Index), which is designed to reflect the performance of large and medium sized companies representing 85% of the readily available shares in the United States of America. The Index contains all of the constituents of the Parent Index assigned to the 'MSCI USA Energy' classification. The Index is calculated on a total return net basis. This means that all dividends and distributions by the companies are reinvested in the shares after tax. The Index is reviewed and rebalanced on a quarterly basis and may also be rebalanced at other times in order to reflect corporate activity such as mergers and acquisitions. The Index is calculated in US Dollars on a daily basis.