MFS Investment Management—the firm behind the first U.S. open-end mutual fund—has entered the active ETF market with nine strategies spanning equities, fixed income, and municipal bonds. The move isn’t a reinvention. It’s an extension of more than a century of investment discipline into a modern structure. Jamie Harrison, Head of ETF Capital Markets at MFS, breaks down the lineup, the case for blending active and passive, and what’s driving advisor adoption.