MBPAX Performance — MFS Pennsylvania Municipal Bond Fund, Class B
Data updated: 2026-08-25
MBPAX returned +2.42% year to date and +6.85% over one year to Jun 2026. Annualised returns are +3.40% over 3 years and +0.09% over 5 years. The fund trailed its Long-Term Municipal Bond category average: $100 invested three years ago grew to $111, against $112 for the category, and to $107 over one year, against $108. Volatility over the past three years was 6.15% a year. In the 12 months to Jun 2026 the fund took in a net $20.2M, and assets reached $194.75M.
MBPAX Growth of $100
What $100 invested in MFS Pennsylvania 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 | MBPAX | Category average |
|---|---|---|
| 1 year (Jul 2025 – Jun 2026) | $107 | $108 |
| 3 years (Jul 2023 – Jun 2026) | $111 | $112 |
| 5 years (Jul 2021 – Jun 2026) | $100 | $103 |
| Since data start (Jul 2019 – Jun 2026) | $108 | $113 |
MBPAX Trailing Returns
Total returns to Jun 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +2.42% |
| 1 year | +6.85% |
| 3 years (annualised) | +3.40% |
| 5 years (annualised) | +0.09% |
MBPAX Annual Returns
Calendar-year total returns of MFS Pennsylvania Municipal Bond Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–Jun) | +2.42% |
| 2025 | +2.73% |
| 2024 | +2.21% |
| 2023 | +4.70% |
| 2022 | −10.85% |
| 2021 | +1.89% |
| 2020 | +3.76% |
| 2019 (Jul–Dec) | +1.98% |
MBPAX 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% | −2.1% | +1.3% | +0.4% | +1.0% | — | — | — | — | — | — |
| 2025 | +0.2% | +0.9% | −2.0% | −0.7% | −0.6% | +0.7% | −0.8% | +0.8% | +2.9% | +1.3% | +0.2% | −0.1% |
| 2024 | −0.1% | −0.1% | 0.0% | −1.3% | 0.0% | +2.0% | +0.8% | +0.8% | +1.2% | −1.4% | +1.7% | −1.4% |
| 2023 | +3.1% | −2.6% | +1.8% | −0.1% | −0.8% | +0.6% | +0.2% | −1.5% | −3.2% | −1.9% | +6.9% | +2.6% |
| 2022 | −2.3% | −0.7% | −3.2% | −3.0% | +1.3% | −2.3% | +2.3% | −2.6% | −4.5% | −1.4% | +5.4% | 0.0% |
| 2021 | +0.8% | −1.5% | +0.4% | +1.0% | +0.7% | +0.5% | +0.9% | −0.5% | −0.8% | −0.4% | +0.9% | +0.1% |
| 2020 | +1.7% | +1.5% | −4.8% | −2.4% | +2.9% | +1.3% | +1.8% | −0.4% | 0.0% | −0.3% | +1.7% | +1.0% |
| 2019 | — | — | — | — | — | — | +0.6% | +1.7% | −0.5% | −0.2% | +0.1% | +0.3% |
MBPAX Risk
Risk measures from monthly returns over Jul 2023 – Jun 2026.
- 3-year volatility (annualised): 6.15%
- 3-year Sharpe ratio: -0.18 (vs 4.5% risk-free rate)
- Best month: +6.93% (Nov 2023)
- Worst month: −3.22% (Sep 2023)
MBPAX Fund Flows
Monthly money in and out of MFS Pennsylvania Municipal Bond Fund, from SEC Form N-PORT.
- 12-month net flow: $20.2M
- 12-month gross sales (incl. reinvestments): $61.4M
- Sales ÷ redemptions: 1.49×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| Jun 2026 | $3.5M | $2.4M | $1.1M |
| May 2026 | $4.4M | $3.1M | $1.3M |
| Apr 2026 | $4.8M | $5.1M | −$381K |
| Mar 2026 | $4.7M | $4.2M | $471K |
| Feb 2026 | $3.2M | $1.8M | $1.4M |
| Jan 2026 | $5.2M | $2.3M | $2.9M |
| Dec 2025 | $8.9M | $5.0M | $3.9M |
| Nov 2025 | $3.6M | $3.5M | $69K |
| Oct 2025 | $4.1M | $2.7M | $1.4M |
| Sep 2025 | $5.6M | $3.3M | $2.4M |
| Aug 2025 | $3.1M | $3.0M | $120K |
| Jul 2025 | $10.3M | $4.7M | $5.6M |
MBPAX Assets Under Management
Net assets of MFS Pennsylvania Municipal Bond Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-06-30 | $194.75M |
| 2026-03-31 | $189.02M |
| 2025-12-31 | $186.22M |
| 2025-09-30 | $179.46M |
| 2025-06-30 | $167.48M |
| 2025-03-31 | $165.47M |
| 2024-12-31 | $165.69M |
| 2024-09-30 | $165.84M |
| 2024-06-30 | $161.33M |
| 2024-03-31 | $162.13M |
| 2023-12-31 | $159.78M |
| 2023-09-30 | $152.49M |
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.