In 1986, MFS offered the first closed-end, high-yield municipal bond fund to be traded on the New York Stock Exchange.

[5] In 1998, MFS Chairman and Chief Executive, A. Keith Brodkin died, causing a major shift in top management.

[6] During the early 2000s, MFS and five other mutual fund companies in the Boston area were investigated by Massachusetts and New Hampshire regulators.

[7] MFS implemented company reforms to inform investors about fees, keep fund boards independent and create deterrents to market timing.

[citation needed] In January 2025, MFS launched its first ETF products, including five different actively managed funds.