MFSM Performance — MFS Active Intermediate Muni Bond ETF
Data updated: 2026-07-27
MFSM returned +1.72% year to date and +7.08% over one year to May 2026. Over one year the fund beat its Intermediate Municipal Bond category average: $100 grew to $107, against $106 for the category. Volatility over the past 12 months was 3.40% a year. In the 12 months to May 2026 the fund took in a net $55.9M, and assets reached $98.96M.
MFSM Growth of $100
What $100 invested in MFS Active Intermediate Muni Bond ETF grew to, compounded from monthly returns reported on SEC Form N-PORT, against the Intermediate Municipal Bond category average over the same months.
| Period | MFSM | Category average |
|---|---|---|
| 1 year (Jun 2025 – May 2026) | $107 | $106 |
| Since data start (Dec 2024 – May 2026) | $106 | $104 |
MFSM Trailing Returns
Total returns to May 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +1.72% |
| 1 year | +7.08% |
MFSM Annual Returns
Calendar-year total returns of MFS Active Intermediate Muni Bond ETF, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–May) | +1.72% |
| 2025 | +5.17% |
| 2024 (Dec–Dec) | −1.27% |
MFSM Monthly Returns
Monthly total returns as reported on SEC Form N-PORT.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | +0.9% | +1.4% | −2.1% | +1.1% | +0.5% | — | — | — | — | — | — | — |
| 2025 | +0.6% | +1.1% | −1.4% | −0.5% | +0.1% | +0.8% | 0.0% | +0.8% | +1.9% | +1.1% | +0.3% | +0.2% |
| 2024 | — | — | — | — | — | — | — | — | — | — | — | −1.3% |
MFSM Risk
Risk measures from monthly returns over Jun 2025 – May 2026.
- 1-year volatility (annualised): 3.40%
- Best month: +1.90% (Sep 2025)
- Worst month: −2.07% (Mar 2026)
MFSM Fund Flows
Monthly money in and out of MFS Active Intermediate Muni Bond ETF, from SEC Form N-PORT.
- 12-month net flow: $55.9M
- 12-month gross sales (incl. reinvestments): $55.9M
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| May 2026 | $6.2M | $0 | $6.2M |
| Apr 2026 | $13.2M | $0 | $13.2M |
| Mar 2026 | $8.2M | $0 | $8.2M |
| Feb 2026 | $17.8M | $0 | $17.8M |
| Jan 2026 | $1.3M | $0 | $1.3M |
| Dec 2025 | $1.9M | $0 | $1.9M |
| Nov 2025 | $0 | $0 | $0 |
| Oct 2025 | $1.9M | $0 | $1.9M |
| Sep 2025 | $0 | $0 | $0 |
| Aug 2025 | $2.4M | $0 | $2.4M |
| Jul 2025 | $1.8M | $0 | $1.8M |
| Jun 2025 | $1.2M | $0 | $1.2M |
MFSM Assets Under Management
Net assets of MFS Active Intermediate Muni Bond ETF by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-05-31 | $98.96M |
| 2026-02-28 | $72.45M |
| 2025-11-30 | $50.61M |
| 2025-08-31 | $47.62M |
| 2025-05-31 | $41.84M |
| 2025-02-28 | $38.61M |
For information only. Not investment advice: figures are as reported in SEC filings and may contain errors or be out of date. Past performance does not guarantee future results.