The investment seeks as closely as possible, before fees and expenses, the total return of the Bloomberg US Treasury Inflation-Linked Bond Index composed of inflation-protected U.S. Treasury securities. The index includes all publicly-issued TIPS that have at least one year remaining to maturity, are rated investment grade and have $500 million or more of outstanding face value. The fund will invest at least 90% of its net assets (including, for this purpose, any borrowings for investment purposes) in securities included in the index. It may invest up to 10% of its net assets in securities not included in the index.