The State Street SPDR S&P North American Natural Resources ETF seeks to provide investment results that, before fees and expenses, correspond generally to the total return performance of the S&P BMI North American Natural Resources Index (the "Index")Seeks to provide exposure to U.S. and Canadian publicly traded large and mid cap companies within the sub-industries of the energy, metals & mining or agriculture categoriesAt each quarterly Index rebalancing, the combined weight of securities of companies in the energy, metals & mining and agriculture categories are set at 45%, 35% and 20%, respectively