MBCAX Performance — MFS California Municipal Bond Fund, Class B
Data updated: 2026-08-25
MBCAX returned +2.70% year to date and +7.50% over one year to Jun 2026. Annualised returns are +3.42% over 3 years and −0.10% 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 6.40% a year. In the 12 months to Jun 2026 the fund took in a net $110.7M, and assets reached $830.10M.
MBCAX Growth of $100
What $100 invested in MFS California 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 | MBCAX | 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) | $107 | $113 |
MBCAX Trailing Returns
Total returns to Jun 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +2.70% |
| 1 year | +7.50% |
| 3 years (annualised) | +3.42% |
| 5 years (annualised) | −0.10% |
MBCAX Annual Returns
Calendar-year total returns of MFS California Municipal Bond Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–Jun) | +2.70% |
| 2025 | +2.11% |
| 2024 | +1.97% |
| 2023 | +6.16% |
| 2022 | −12.29% |
| 2021 | +2.18% |
| 2020 | +3.23% |
| 2019 (Jul–Dec) | +2.07% |
MBCAX 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 | +0.4% | +1.7% | −2.4% | +1.3% | +0.6% | +1.1% | — | — | — | — | — | — |
| 2025 | −0.1% | +1.1% | −2.1% | −0.9% | −1.1% | +0.6% | −1.1% | +0.8% | +3.4% | +1.5% | +0.2% | −0.3% |
| 2024 | −0.1% | +0.2% | 0.0% | −1.2% | 0.0% | +2.0% | +0.6% | +0.8% | +0.9% | −1.4% | +1.5% | −1.4% |
| 2023 | +3.5% | −2.6% | +1.7% | +0.1% | −0.7% | +0.8% | +0.2% | −1.4% | −3.1% | −1.9% | +7.1% | +2.8% |
| 2022 | −2.9% | −0.7% | −3.3% | −3.6% | +1.2% | −3.0% | +3.3% | −2.6% | −5.1% | −1.5% | +5.8% | −0.2% |
| 2021 | +0.9% | −1.6% | +0.5% | +1.2% | +0.8% | +0.4% | +1.1% | −0.5% | −1.0% | −0.5% | +0.9% | 0.0% |
| 2020 | +1.9% | +1.6% | −6.6% | −2.3% | +3.6% | +1.5% | +1.8% | −0.5% | 0.0% | −0.3% | +2.1% | +0.8% |
| 2019 | — | — | — | — | — | — | +0.5% | +2.0% | −0.6% | −0.1% | +0.2% | +0.2% |
MBCAX Risk
Risk measures from monthly returns over Jul 2023 – Jun 2026.
- 3-year volatility (annualised): 6.40%
- 3-year Sharpe ratio: -0.17 (vs 4.5% risk-free rate)
- Best month: +7.08% (Nov 2023)
- Worst month: −3.10% (Sep 2023)
MBCAX Fund Flows
Monthly money in and out of MFS California Municipal Bond Fund, from SEC Form N-PORT.
- 12-month net flow: $110.7M
- 12-month gross sales (incl. reinvestments): $299.5M
- Sales ÷ redemptions: 1.59×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| Jun 2026 | $19.7M | $13.6M | $6.2M |
| May 2026 | $21.9M | $12.5M | $9.4M |
| Apr 2026 | $19.2M | $11.4M | $7.8M |
| Mar 2026 | $32.2M | $12.7M | $19.5M |
| Feb 2026 | $23.4M | $7.3M | $16.1M |
| Jan 2026 | $23.3M | $9.5M | $13.9M |
| Dec 2025 | $39.9M | $26.1M | $13.7M |
| Nov 2025 | $22.1M | $12.5M | $9.6M |
| Oct 2025 | $23.5M | $13.2M | $10.3M |
| Sep 2025 | $27.9M | $15.2M | $12.7M |
| Aug 2025 | $23.1M | $32.8M | −$9.6M |
| Jul 2025 | $23.2M | $22.2M | $1.1M |
MBCAX Assets Under Management
Net assets of MFS California Municipal Bond Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-06-30 | $830.10M |
| 2026-03-31 | $788.09M |
| 2025-12-31 | $747.70M |
| 2025-09-30 | $709.12M |
| 2025-06-30 | $688.29M |
| 2025-03-31 | $698.92M |
| 2024-12-31 | $692.61M |
| 2024-09-30 | $670.34M |
| 2024-06-30 | $609.89M |
| 2024-03-31 | $585.70M |
| 2023-12-31 | $554.85M |
| 2023-09-30 | $493.41M |
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.