MPOAX — MFS California Municipal Bond Fund
Data updated: 2026-08-25
MPOAX — MFS California Municipal Bond Fund. Long Municipal - National Bond · $830.10M AUM · 0.50% expense ratio. Holdings, fees, performance and SEC filings.
MPOAX Fund Overview
MPOAX — MFS California 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: $830.10M
- 1-year return: 8.5%
- Ticker: MPOAX
- SEC CIK: 0000751656
- SEC series ID: S000002530
- Share class ID: C000194244
MPOAX Holdings
Top 10 holdings of MFS California Municipal Bond Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| California Municipal Finance Authority | 1.21% |
| California Community Choice Financing Authority | 1.13% |
| Los Angeles Housing Authority | 1.01% |
| California Community Choice Financing Authority | 0.98% |
| California Municipal Finance Authority | 0.97% |
| MFS Institutional Money Market Portfolio | 0.93% |
| Oakland Unified School District/Alameda County | 0.90% |
| Inglewood Joint Powers Authority | 0.78% |
| Fnma | 0.73% |
| California Health Facilities Financing Authority | 0.71% |
MPOAX Portfolio Allocation
Asset-class allocation of MFS California Municipal Bond Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Fixed Income | 99.7% |
| Cash & Equivalents | 0.9% |
MPOAX Performance
Total returns for MPOAX (as of 2026-09-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 3.1% |
| 1 year | 8.5% |
| 3 years (annualised) | 4.3% |
| 5 years (annualised) | 0.8% |
MPOAX Risk Information
Risk metrics for MPOAX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 5.1%
MPOAX Costs and Fees
MPOAX costs about $50 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.50%
- Gross expense ratio: 0.53%
- Portfolio turnover: 15%
- Brokerage commissions: 0.00 bps of average net assets (SEC N-CEN)
MPOAX Cashflows
Over the 12 months to 2026-06, MFS California Municipal Bond Fund had net inflows of $110.70M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-06 | $6.17M |
| 2026-05 | $9.45M |
| 2026-04 | $7.77M |
| 2026-03 | $19.49M |
| 2026-02 | $16.14M |
| 2026-01 | $13.88M |
MPOAX Debt Constituents
Largest debt holdings of MFS California Municipal Bond Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| California Municipal Finance Authority | 1.21% |
| California Community Choice Financing Authority | 1.13% |
| Los Angeles Housing Authority | 1.01% |
| California Community Choice Financing Authority | 0.98% |
| California Municipal Finance Authority | 0.97% |
| Oakland Unified School District/Alameda County | 0.90% |
| Inglewood Joint Powers Authority | 0.78% |
| Fnma | 0.73% |
| California Health Facilities Financing Authority | 0.71% |
| San Francisco City & County Airport Comm-San Francisco International Airport | 0.66% |
MPOAX Prospectus and SEC Filings
Official MFS California 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.