The fund, using a passive or indexing investment approach, seeks investment results that correspond generally to the performance, before fees and expenses, of the Underlying Index, which is comprised of US dollar-denominated high yield corporate bonds that potentially have higher beta to the overall high yield corporate bond market. The fund uses a representative sampling indexing strategy in seeking to track the Underlying Index, meaning it generally will invest in a sample of securities in the index whose risk, return and other characteristics resemble the risk, return and other characteristics of the Underlying Index as a whole. The fund will invest at least 80% of its total assets (but typically far more) in component securities of the Underlying Index.