MBMSX Performance — MFS Mississippi Municipal Bond Fund, Class B
Data updated: 2026-08-25
MBMSX returned +2.28% year to date and +7.13% over one year to Jun 2026. Annualised returns are +3.19% over 3 years and −0.04% over 5 years. The fund trailed its Long-Term Municipal Bond category average: $100 invested three years ago grew to $110, against $112 for the category, and to $107 over one year, against $108. Volatility over the past three years was 6.04% a year. In the 12 months to Jun 2026 the fund lost a net $4.8M, and assets reached $62.25M.
MBMSX Growth of $100
What $100 invested in MFS Mississippi 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 | MBMSX | Category average |
|---|---|---|
| 1 year (Jul 2025 – Jun 2026) | $107 | $108 |
| 3 years (Jul 2023 – Jun 2026) | $110 | $112 |
| 5 years (Jul 2021 – Jun 2026) | $100 | $103 |
| Since data start (Jul 2019 – Jun 2026) | $106 | $113 |
MBMSX Trailing Returns
Total returns to Jun 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +2.28% |
| 1 year | +7.13% |
| 3 years (annualised) | +3.19% |
| 5 years (annualised) | −0.04% |
MBMSX Annual Returns
Calendar-year total returns of MFS Mississippi Municipal Bond Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–Jun) | +2.28% |
| 2025 | +3.13% |
| 2024 | +1.19% |
| 2023 | +4.35% |
| 2022 | −10.58% |
| 2021 | +1.30% |
| 2020 | +3.66% |
| 2019 (Jul–Dec) | +1.55% |
MBMSX 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% | −2.3% | +1.4% | +0.5% | +0.9% | — | — | — | — | — | — |
| 2025 | +0.1% | +1.0% | −2.0% | −0.2% | −0.8% | +0.5% | −1.0% | +0.9% | +3.3% | +1.3% | +0.2% | 0.0% |
| 2024 | −0.1% | −0.2% | 0.0% | −1.5% | 0.0% | +2.1% | +0.8% | +0.5% | +1.1% | −1.5% | +1.7% | −1.6% |
| 2023 | +2.9% | −2.7% | +2.0% | −0.1% | −1.1% | +0.4% | +0.2% | −1.5% | −3.0% | −1.5% | +6.4% | +2.7% |
| 2022 | −2.6% | −0.6% | −3.0% | −3.0% | +1.2% | −2.2% | +2.6% | −2.7% | −4.3% | −0.9% | +5.0% | −0.4% |
| 2021 | +0.6% | −1.4% | +0.4% | +0.9% | +0.2% | +0.3% | +0.6% | −0.3% | −0.8% | −0.2% | +0.8% | +0.1% |
| 2020 | +1.8% | +1.1% | −4.1% | −1.5% | +3.0% | +0.8% | +1.4% | −0.4% | −0.2% | −0.4% | +1.6% | +0.6% |
| 2019 | — | — | — | — | — | — | +0.4% | +1.6% | −0.6% | −0.1% | +0.1% | +0.2% |
MBMSX Risk
Risk measures from monthly returns over Jul 2023 – Jun 2026.
- 3-year volatility (annualised): 6.04%
- 3-year Sharpe ratio: -0.22 (vs 4.5% risk-free rate)
- Best month: +6.38% (Nov 2023)
- Worst month: −3.05% (Sep 2023)
MBMSX Fund Flows
Monthly money in and out of MFS Mississippi Municipal Bond Fund, from SEC Form N-PORT.
- 12-month net flow: −$4.8M
- 12-month gross sales (incl. reinvestments): $7.9M
- Sales ÷ redemptions: 0.62×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| Jun 2026 | $744K | $1.1M | −$404K |
| May 2026 | $764K | $524K | $239K |
| Apr 2026 | $342K | $842K | −$500K |
| Mar 2026 | $540K | $1.1M | −$603K |
| Feb 2026 | $413K | $524K | −$111K |
| Jan 2026 | $1.1M | $1.3M | −$174K |
| Dec 2025 | $629K | $933K | −$305K |
| Nov 2025 | $565K | $434K | $131K |
| Oct 2025 | $394K | $674K | −$279K |
| Sep 2025 | $655K | $1.4M | −$773K |
| Aug 2025 | $665K | $1.7M | −$1.0M |
| Jul 2025 | $1.1M | $2.1M | −$984K |
MBMSX Assets Under Management
Net assets of MFS Mississippi Municipal Bond Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-06-30 | $62.25M |
| 2026-03-31 | $61.64M |
| 2025-12-31 | $63.20M |
| 2025-09-30 | $63.19M |
| 2025-06-30 | $64.48M |
| 2025-03-31 | $68.70M |
| 2024-12-31 | $71.13M |
| 2024-09-30 | $74.40M |
| 2024-06-30 | $74.49M |
| 2024-03-31 | $79.34M |
| 2023-12-31 | $82.04M |
| 2023-09-30 | $79.25M |
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.