The DRLL fund aims to replicate an index that is a specialized segment of a broader benchmark for the American stock market. This parent index represents the one thousand largest publicly traded U.S. corporations, with its constituents weighted according to their market capitalization, adjusted for shares available for public trading. Typically, under ordinary conditions, a substantial portion—at least 80%—of the fund's total assets (excluding any collateral received from lending out its securities) will be allocated to companies operating within the U.S. energy industry.