The fund invests in securities that ProShare Advisors believes should track the performance of the index. The index provider then selects into the index the 40 largest companies, by market capitalization, that generate 75% or more of their revenue from products or services produced or provided by one or more of the applicable RBICS Sub-Industries. The fund will invest at least 80% of its net assets in the securities that comprise the index. It is non-diversified.