MFS Active Exchange Traded Funds Trust – MFS Active Core Plus Bond ETF (NYSE Arca: MFSB) is a U.S.-domiciled, actively managed exchange-traded fund that seeks total return, with an emphasis on current income, through investment in a diversified portfolio of global fixed-income securities. The Fund invests principally in debt obligations issued by governments, government-related entities, corporations and securitization vehicles, including U.S. Treasury securities; agency and non-agency mortgage-backed securities; asset-backed securities; investment-grade and high-yield corporate bonds; sovereign and other non-U.S. debt instruments; municipal securities; cash and cash equivalents; and derivatives, including futures, for portfolio-management and investment purposes. It may invest across credit-quality levels, maturities, sectors and countries, enabling active allocation among core fixed-income and higher-yielding “plus” sectors. The Fund targets U.S. retail and institutional investors seeking actively managed broad bond-market exposure and income-oriented investment solutions.
MFSB is a diversified series of MFS Active Exchange Traded Funds Trust, a Massachusetts business trust organized in 2024. The Fund commenced operations on December 5, 2024, and is managed by Massachusetts Financial Services Company, doing business as MFS Investment Management, from Boston, Massachusetts. Philipp Burgener and Joshua Marston serve as portfolio managers; the Bloomberg U.S. Aggregate Bond Index is used as a performance benchmark for the managers’ substantially similar strategy. State Street Bank and Trust Company provides custody, administration and transfer-agency services, while MFS Fund Distributors, Inc. acts as distributor. The Fund’s shares trade on NYSE Arca under the ticker MFSB.
Recent developments include MFSB’s December 2024 launch as part of MFS Investment Management’s expansion into actively managed ETFs. During 2025, the Trust broadened its ETF platform with the launches of the MFS Active Mid Cap ETF in September and the MFS Blended Research Core Equity ETF and MFS Blended Research International Equity ETF in October; in December 2025, the Trust’s registration materials were updated to add the MFS Blended Research Emerging Markets Equity ETF to the product lineup. MFSB remains one of the Trust’s core fixed-income offerings and continues to operate within MFS’s expanded active and blended-research ETF platform.