MFSB

The fund's investment objective is to seek total return with an emphasis on current income, but also considering capital appreciation. US core plus bond strategy that provides exposure to the broad U.S. bond market with a bias towards credit markets The fund normally invests at least 80% of the fund's net assets in debt instruments. Debt instruments include corporate bonds, U.S. Government securities, foreign government securities, securitized instruments (including mortgage-backed securities and other asset-backed securities), municipal instruments, and other obligations to repay money borrowed. MFS generally focuses on investing the fund's assets in investment grade quality debt instruments, but also typically invests a portion of the fund's assets in below investment grade quality debt instruments. MFS may invest the fund's assets in foreign securities, including emerging market securities. The fund's investment strategy is referred to as "Core Plus" because, in addition to investing in a core portfolio of investment grade quality debt instruments, MFS normally invests a portion of the fund's assets in below investment grade quality debt instruments and/or emerging markets debt instruments.