American Century High Income G (null) Fonds

The fund invests primarily in high-yield corporate bonds and other debt instruments with an emphasis on those that are rated below investment-grade. A high-yield security, or junk bond, is one that has been rated below the four highest categories used by a nationally recognized statistical rating organization, or, if unrated, determined by the investment advisor to be of similar quality. It may invest up to 20% of its net assets in bank loan investments. The fund may invest in fixed-income instruments of foreign issuers, including emerging market issuers.