MFS Active Short Muni Bond ETF is an exchange-traded fund sponsored by MFS Investment Management that seeks total return with an emphasis on current income exempt from U.S. federal income tax, while also considering capital preservation; the fund primarily invests in municipal instruments and is designed for investors seeking short-duration municipal bond exposure. MFS Investment Management, founded in 1924 and headquartered at 111 Huntington Avenue in Boston, Massachusetts, operates as a global active asset manager serving financial advisors, intermediaries, and institutional clients through equity, fixed income, and ETF strategies across the United States and international markets. The firm’s global research platform includes approximately 300 investment professionals based in Boston and in offices in Hong Kong, London, Singapore, São Paulo, Sydney, Tokyo, and Toronto. In recent developments, MFS launched the Active Short Muni Bond ETF as part of its active ETF platform and has continued expanding its municipal ETF lineup, including the Active Intermediate Muni Bond ETF introduced in December 2024; in addition, MFS reached an agreement in 2025 to transfer management of selected closed-end fund assets to Aberdeen Investments, with the transaction completed in 2026 through mergers and reorganizations of several MFS municipal bond and taxable fixed income closed-end funds.