The fund offers diversified bond exposure through an actively managed portfolio of government and corporate debt securities globally. It includes asset- and mortgage-backed securities, and other fixed income instruments. The fund primarily holds investment grade bonds, but may also invest in high yield debt securities directly or indirectly through the use of derivatives. The portfolio is constructed using a systematic value-added strategy that allocates based on the optimization of sector, credit quality, maturity, volatility, and yield of a proprietary model portfolio. The fund manager may also utilize a security selection overlay to enhance returns. The fund may invest up to 20% and 35% of its net assets in foreign government bonds with a minimum credit rating of AA and AAA, respectively, and up to 30% of its net assets in debt obligations issued and guaranteed by Fannie Mae or Freddie Mac. The fund uses derivatives to manage volatility and duration risk.