MBMAX — MFS Massachusetts Municipal Bond Fund
Data updated: 2026-06-11
MBMAX — MFS Massachusetts Municipal Bond Fund data: holdings, portfolio allocation, expenses, performance, cashflows, risk and SEC filings. Long Municipal - National Bond · $408.78M AUM · 1.57% expense ratio · 2.9% 1-yr return. From SEC regulatory filings.
MBMAX Fund Overview
MBMAX — MFS Massachusetts Municipal Bond Fund is a US mutual fund managed by Mfs Municipal Series Trust, categorised as Long Municipal - National Bond. ABC INVEST provides holdings, performance, costs, cashflows, risk data, prospectus documents and SEC filings, sourced from SEC filings.
- Type: US mutual fund
- Manager: Mfs Municipal Series Trust
- Category: Long Municipal - National Bond
- Assets under management: $408.78M
- 1-year return: 2.9%
- Ticker: MBMAX
- SEC CIK: 0000751656
- SEC series ID: S000002534
- Share class ID: C000006988
MBMAX Holdings
Top 10 holdings of MFS Massachusetts Municipal Bond Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| MFS Institutional Money Market Portfolio | 1.66% |
| Massachusetts Development Finance Agency | 1.35% |
| Commonwealth of Massachusetts Transportation Fund Revenue | 1.28% |
| Massachusetts Development Finance Agency | 1.23% |
| Massachusetts Clean Water Trust (The) | 1.04% |
| Massachusetts Bay Transportation Authority Sales Tax Revenue | 1.03% |
| Commonwealth of Massachusetts | 1.02% |
| Massachusetts School Building Authority | 1.02% |
| Massachusetts School Building Authority | 1.01% |
| Commonwealth of Massachusetts Transportation Fund Revenue | 1.01% |
MBMAX Portfolio Allocation
Asset-class allocation of MFS Massachusetts Municipal Bond Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Fixed Income | 97.2% |
| Cash & Equivalents | 1.7% |
MBMAX Performance
Total returns for MBMAX (as of 2026-08-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | -0.4% |
| 1 year | 2.9% |
| 3 years (annualised) | 2.1% |
| 5 years (annualised) | -0.3% |
MBMAX Risk Information
Risk metrics for MBMAX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 4.4%
MBMAX Costs and Fees
MBMAX costs about $157 per $10,000 invested per year in fund expenses.
- Net expense ratio: 1.57%
- Gross expense ratio: 1.63%
- Portfolio turnover: 10%
- Brokerage commissions: 0.00 bps of average net assets (SEC N-CEN)
MBMAX Cashflows
Over the 12 months to 2026-03, MFS Massachusetts Municipal Bond Fund had net inflows of $17.87M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-03 | $2.81M |
| 2026-02 | $3.47M |
| 2026-01 | $5.37M |
| 2025-12 | −$2.73M |
| 2025-11 | $6.22M |
| 2025-10 | $361.77K |
MBMAX Debt Constituents
Largest debt holdings of MFS Massachusetts Municipal Bond Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| Massachusetts Development Finance Agency | 1.35% |
| Commonwealth of Massachusetts Transportation Fund Revenue | 1.28% |
| Massachusetts Development Finance Agency | 1.23% |
| Massachusetts Clean Water Trust (The) | 1.04% |
| Massachusetts Bay Transportation Authority Sales Tax Revenue | 1.03% |
| Commonwealth of Massachusetts | 1.02% |
| Massachusetts School Building Authority | 1.02% |
| Massachusetts School Building Authority | 1.01% |
| Commonwealth of Massachusetts Transportation Fund Revenue | 1.01% |
| Tri-County Regional Vocational Technical School District/MA | 0.95% |
MBMAX Prospectus and SEC Filings
Official MFS Massachusetts Municipal Bond Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
Related Funds
Other Long Municipal - National Bond funds tracked on ABC INVEST:
Data Sources
ABC INVEST compiles this page from public filings made to the U.S. Securities and Exchange Commission (SEC) through EDGAR: portfolio holdings and monthly cashflows from Form N-PORT, expenses and returns from fund prospectuses (Form 485BPOS) and the SEC DERA Risk/Return Summary data sets, annual data from Form N-CEN, and shareholder reports from Form N-CSR.