The folks at a 101-year-old, $644.1-billion-AUM* asset manager, the OG U.S. fund firm, are expanding their ETF lineup with a sixth launch.

Last week, Emily Dupre, national sales manager for MFS' MFS Fund Distributors, Inc. (MFD) [profile], unveiled the launch of the MFS Active Mid Cap ETF (MMID on the NYSE). Boston-based MFS (Massachusetts Financial Services Company, a subsidiary of Sun Life) serves as investment advisor and administrator for the new fund.

MMID's debut date was September 24. The new ETF comes with an expense ratio of 59 basis points, and as of yesterday (October 1) MMID had about $21.73 million in AUM.

Kevin Schmitz serves as the sole PM of MMID. Yet the MFS team notes that Schmitz is supported by MFS' global investment platform of more than 300 people.

Dupre puts the launch of MMID in the context of the "long-established track records" of MFS' "existing dedicated US mid cap equity strategies."

"MMID expands choice for our clients to access the considerable opportunities within the US mid cap equity market," Dupre states. "We are excited to add this new strategy to help investors access this dynamic part of the US equity market."

The launch of MMID comes less than a year after the MFS team launched their first five ETFs, on December 5, 2025. The MFS team notes that those first five ETFs have since grown to about $750 million in AUM**.

"We are pleased at the initial success of our first five active ETFs, and we are excited to maintain that momentum by adding an active mid cap core ETF to our lineup," Dupre states. "We believe that it will be both well received by our distribution partners and that it can offer significant value to a diversified portfolio."

MMID is an actively managed series of MFS Active Exchange Traded Funds Trust. The new ETF's other service providers include:

Ernst & Young LLP as independent accounting firm;

MFD as distributor;

Ropes & Gray LLP as counsel; and

State Street Bank and Trust Company as custodian, dividend disbursing agent, and transfer agent.

*As of August 30, 2025.

**As of August 31, 2025. 

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