The fund's primary goal is to replicate the financial performance, before accounting for fees and expenses, of the Nasdaq BulletShares® USD Corporate Bond 2021 Index. It typically dedicates at least 80% of its total assets to the securities that make up this benchmark. The underlying index is structured to track the returns of a portfolio consisting of high-quality, U.S. dollar-denominated corporate bonds, all of which possess an original or effective maturity date within 2021.