The investment seeks investment results that, before fees and expenses, correspond generally to the total return performance of an index. The fund employs a replication strategy in seeking to track the performance of the S&P Global Natural Resources Index. It typically invests in substantially all of the securities represented in the index in approximately the same proportions as the index. The index is comprised of 90 of the largest U.S. and foreign publicly traded companies, based on market capitalization, in natural resources and commodities businesses that meet certain investability requirements.