The investment seeks to track the investment results (before fees and expenses) of the Invesco Investment Grade Defensive Index (the "underlying index"). The fund generally will invest at least 80% of its total assets in securities that comprise the underlying index. The underlying index is designed to provide exposure to U.S. investment grade bonds having the highest "quality scores" (within the eligible universe of U.S. investment grade bonds) as determined by the index provider. The fund is non-diversified.