MBMDX — MFS Maryland Municipal Bond Fund
Data updated: 2026-08-25
MBMDX — MFS Maryland Municipal Bond Fund. Long Municipal - National Bond · $161.51M AUM · 1.61% expense ratio. Holdings, fees, performance and SEC filings.
MBMDX Fund Overview
MBMDX — MFS Maryland 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: $161.51M
- 1-year return: 6.8%
- Ticker: MBMDX
- SEC CIK: 0000751656
- SEC series ID: S000002533
- Share class ID: C000006986
MBMDX Holdings
Top 10 holdings of MFS Maryland 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 | 1.71% |
| Maryland Economic Development Corp. | 1.30% |
| Maryland Economic Development Corp. | 1.25% |
| Puerto Rico Sales Tax Financing Corp. Sales Tax Revenue | 1.12% |
| Maryland Stadium Authority | 1.11% |
| County of Prince George's MD | 1.02% |
| Washington Metropolitan Area Transit Authority Dedicated Revenue | 1.01% |
| Maryland Health & Higher Educational Facilities Authority | 0.99% |
| Maryland Stadium Authority | 0.99% |
| County of Anne Arundel MD | 0.98% |
MBMDX Portfolio Allocation
Asset-class allocation of MFS Maryland Municipal Bond Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Fixed Income | 96.2% |
| Cash & Equivalents | 1.7% |
| Other | 0.8% |
MBMDX Performance
Total returns for MBMDX (as of 2026-09-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 2.2% |
| 1 year | 6.8% |
| 3 years (annualised) | 3.3% |
| 5 years (annualised) | 0.1% |
MBMDX Risk Information
Risk metrics for MBMDX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 4.5%
MBMDX Costs and Fees
MBMDX costs about $161 per $10,000 invested per year in fund expenses.
- Net expense ratio: 1.61%
- Gross expense ratio: 1.75%
- Portfolio turnover: 9%
- Brokerage commissions: 0.00 bps of average net assets (SEC N-CEN)
MBMDX Cashflows
Over the 12 months to 2026-06, MFS Maryland Municipal Bond Fund had net inflows of $14.69M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-06 | $637.75K |
| 2026-05 | $1.48M |
| 2026-04 | −$1.07M |
| 2026-03 | $1.38M |
| 2026-02 | $528.37K |
| 2026-01 | $1.83M |
MBMDX Debt Constituents
Largest debt holdings of MFS Maryland Municipal Bond Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| Maryland Economic Development Corp. | 1.30% |
| Maryland Economic Development Corp. | 1.25% |
| Puerto Rico Sales Tax Financing Corp. Sales Tax Revenue | 1.12% |
| Maryland Stadium Authority | 1.11% |
| County of Prince George's MD | 1.02% |
| Washington Metropolitan Area Transit Authority Dedicated Revenue | 1.01% |
| Maryland Health & Higher Educational Facilities Authority | 0.99% |
| Maryland Stadium Authority | 0.99% |
| County of Anne Arundel MD | 0.98% |
| Maryland Health & Higher Educational Facilities Authority | 0.98% |
MBMDX Prospectus and SEC Filings
Official MFS Maryland Municipal Bond Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
- Prospectus (485BPOS) — filed 2026-07-28
- Prospectus (485BPOS) — filed 2025-07-28
- Prospectus (485BPOS) — filed 2024-07-26
- Portfolio holdings (N-PORT) — filed 2026-08-25
- Portfolio holdings (N-PORT) — filed 2026-05-26
- Portfolio holdings (N-PORT) — filed 2026-02-25
- Annual census (N-CEN) — filed 2026-06-11
- Annual census (N-CEN) — filed 2025-06-11
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.