MFS Series Trust I - MFS Research International Fund Class A (MRSAX) is an open-end mutual fund that seeks capital appreciation by investing primarily in foreign equity securities, including emerging market equity securities; the fund is a diversified, analyst-run core international equity strategy benchmarked against the MSCI EAFE Index, emphasizing company-specific stock selection across regions, industries, styles, and market capitalizations rather than country-specific allocations. Core holdings as of October 31, 2025, are diversified across financial services (25.76%), capital goods (24.07%), technology (12.47%), health care (9.39%), and consumer cyclicals (8.72%), with top positions including Hitachi Ltd., Schneider Electric SE, Roche Holding AG, Mizuho Financial Group Inc., and NatWest Group PLC; the portfolio comprises 114 issues with a weighted average market cap of $113.9 billion, active share of 77.68%, and portfolio turnover of 32.82%. The fund, part of MFS Series Trust I managed by MFS Investment Management—a Boston-headquartered firm founded in 1924—commenced operations on January 2, 1997, with Class A shares also launched that year; it operates globally with net assets of $17.6 billion as of October 31, 2025, a net expense ratio of 0.98%, and a maximum front-end sales charge of 5.75%, targeting individual and institutional investors seeking non-U.S. equity exposure. In recent developments, MFS Investment Management, the fund's adviser, launched its first actively managed ETF products in January 2025 and announced in December 2025 an agreement to transfer management of nine closed-end funds totaling approximately £1.5 billion to Aberdeen Investments, consolidating them into two larger vehicles to expand Aberdeen's U.S. fixed income presence; these moves reflect MFS's strategic focus on enhancing its product suite and distribution partnerships amid global market fragmentation. The fund maintains its core international equity mandate with no reported portfolio manager changes or major reorganizations specific to MRSAX in the last 1-2 years, sustaining a team-based approach supported by MFS's global research platform.