MFSSX Performance — MFS Massachusetts Municipal Bond Fund, Class A
Data updated: 2026-08-25
MFSSX returned +2.73% year to date and +7.39% over one year to Jun 2026. Annualised returns are +3.88% over 3 years and +0.66% over 5 years. The fund trailed its Long-Term Municipal Bond category average: $100 invested three years ago grew to $112, against $112 for the category, and to $107 over one year, against $108. Volatility over the past three years was 5.88% a year. In the 12 months to Jun 2026 the fund took in a net $20.7M, and assets reached $418.97M.
MFSSX Growth of $100
What $100 invested in MFS Massachusetts Municipal Bond Fund grew to, compounded from monthly returns reported on SEC Form N-PORT, against the Long-Term Municipal Bond category average over the same months.
| Period | MFSSX | Category average |
|---|---|---|
| 1 year (Jul 2025 – Jun 2026) | $107 | $108 |
| 3 years (Jul 2023 – Jun 2026) | $112 | $112 |
| 5 years (Jul 2021 – Jun 2026) | $103 | $103 |
| Since data start (Jul 2019 – Jun 2026) | $111 | $113 |
MFSSX Trailing Returns
Total returns to Jun 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +2.73% |
| 1 year | +7.39% |
| 3 years (annualised) | +3.88% |
| 5 years (annualised) | +0.66% |
MFSSX Annual Returns
Calendar-year total returns of MFS Massachusetts Municipal Bond Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–Jun) | +2.73% |
| 2025 | +2.96% |
| 2024 | +2.20% |
| 2023 | +6.12% |
| 2022 | −10.27% |
| 2021 | +2.02% |
| 2020 | +3.69% |
| 2019 (Jul–Dec) | +2.11% |
MFSSX 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 | +0.5% | +1.4% | −2.0% | +1.3% | +0.5% | +1.1% | — | — | — | — | — | — |
| 2025 | +0.1% | +0.9% | −1.7% | −0.7% | −0.6% | +0.6% | −0.7% | +0.8% | +2.8% | +1.3% | +0.4% | 0.0% |
| 2024 | +0.1% | −0.1% | +0.1% | −1.2% | +0.1% | +1.9% | +0.9% | +0.7% | +0.9% | −1.4% | +1.5% | −1.3% |
| 2023 | +3.2% | −2.5% | +2.1% | −0.1% | −0.8% | +0.5% | +0.2% | −1.3% | −2.9% | −1.6% | +6.9% | +2.7% |
| 2022 | −2.5% | −0.6% | −2.9% | −3.2% | +1.2% | −2.1% | +2.9% | −2.6% | −4.7% | −1.1% | +5.6% | −0.2% |
| 2021 | +0.7% | −1.4% | +0.5% | +1.0% | +0.5% | +0.3% | +0.8% | −0.4% | −0.8% | −0.2% | +0.9% | +0.1% |
| 2020 | +2.1% | +1.5% | −5.9% | −2.4% | +3.1% | +1.6% | +1.9% | −0.5% | +0.1% | −0.2% | +1.8% | +0.9% |
| 2019 | — | — | — | — | — | — | +0.7% | +1.8% | −0.7% | 0.0% | +0.1% | +0.3% |
MFSSX Risk
Risk measures from monthly returns over Jul 2023 – Jun 2026.
- 3-year volatility (annualised): 5.88%
- 3-year Sharpe ratio: -0.11 (vs 4.5% risk-free rate)
- Best month: +6.85% (Nov 2023)
- Worst month: −2.88% (Sep 2023)
MFSSX Fund Flows
Monthly money in and out of MFS Massachusetts Municipal Bond Fund, from SEC Form N-PORT.
- 12-month net flow: $20.7M
- 12-month gross sales (incl. reinvestments): $121.2M
- Sales ÷ redemptions: 1.21×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| Jun 2026 | $7.9M | $6.4M | $1.5M |
| May 2026 | $5.9M | $4.3M | $1.7M |
| Apr 2026 | $7.1M | $8.4M | −$1.3M |
| Mar 2026 | $9.6M | $6.8M | $2.8M |
| Feb 2026 | $6.4M | $3.0M | $3.5M |
| Jan 2026 | $10.0M | $4.6M | $5.4M |
| Dec 2025 | $14.8M | $17.5M | −$2.7M |
| Nov 2025 | $11.8M | $5.6M | $6.2M |
| Oct 2025 | $7.7M | $7.4M | $362K |
| Sep 2025 | $17.3M | $11.3M | $6.1M |
| Aug 2025 | $11.7M | $10.0M | $1.7M |
| Jul 2025 | $10.9M | $15.4M | −$4.5M |
MFSSX Assets Under Management
Net assets of MFS Massachusetts Municipal Bond Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-06-30 | $418.97M |
| 2026-03-31 | $408.78M |
| 2025-12-31 | $401.01M |
| 2025-09-30 | $393.97M |
| 2025-06-30 | $382.80M |
| 2025-03-31 | $389.95M |
| 2024-12-31 | $385.56M |
| 2024-09-30 | $377.92M |
| 2024-06-30 | $360.16M |
| 2024-03-31 | $353.22M |
| 2023-12-31 | $342.22M |
| 2023-09-30 | $378.22M |
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.