The investment seeks to track the investment results of the Russell 1000® Pure Domestic Exposure Index. The fund invests at least 80% of its assets in the component securities of its underlying index and in investments that have economic characteristics that are substantially identical to the component securities of its underlying index and may invest up to 20% of its assets in certain futures, options and swap contracts, cash and cash equivalents. The index composed of U.S. companies exhibiting higher domestic sales as a proportion of the company's total sales relative to other large- and mid-capitalization U.S. equities.