For more news, information, and strategy, visit our Portfolio Construction Content Hub. MFSB offers investors core bond exposure that could serve as an investor's standalone fixed income allocation in a 60-40 portfolio. Or, it can be used as a complementary active fund to an existing fixed income portfolio that already has indexed fund exposure. As indicated in the fund's fact sheet, MFSB will invest in "investment-grade bond strategy that integrates macro, bottom-up, and technical perspectives in an effort ...