The investment seeks investment results that correspond generally to the performance, before the fund's fees and expenses, of an investment grade corporate bond index called the Nasdaq BulletShares USD Corporate Bond 2021 Index. The fund will invest at least 80% of its total assets in component securities that comprise the index. Under normal circumstances, it will invest at least 80% of its net assets in corporate bonds. The index is designed to represent the performance of a held-to-maturity portfolio of U.S. dollar-denominated investment-grade corporate bonds with effective maturities in the year 2021. The fund is non-diversified.