BND seeks both capital appreciation and distributions through tactical allocation among a broad range of government and corporate bonds from around the world. Bonds are primarily rated investment grade, but up to 20% of the portfolio can be in high-yield bonds and up to 15% in CLO debt tranches and other types of asset-backed securities. The fund may also hold senior secured and unsecured debt, subordinated debt, convertible debt, fixed and floating rate debt, bank loans, money markets, and other funds. The fund manager may also enter into securities lending transactions for additional income, as well as into total return swaps and other derivatives. Holding derivatives may be used to hedge the portfolios interest rate exposure. BND is reconstituted and rebalanced at the discretion of the sub-advisor.