# MFS Massachusetts Municipal Bond Fund

MFS Massachusetts Municipal Bond Fund is a registered fund series of MFS Municipal Series Trust (series S000002534). Net assets $408.8M as of 2026-03-31.

## Profile

- Series ID: S000002534
- Registrant: MFS Municipal Series Trust
- LEI: MI3C3CKY7VNRDNDWCO87
- Net assets: $408.8M
- Total assets: $410.9M
- As of: 2026-03-31

## Advisers

- [MASSACHUSETTS FINANCIAL SERVICES COMPANY (Advisor)](https://search.stillhousedata.com/firm/110045)

## Top holdings (200 reported)

_Showing 15 of 200 holdings by value._

| Holding | Ticker | Value | % of fund |
| --- | --- | --- | --- |
| [MFS Institutional Money Market Portfolio](https://search.stillhousedata.com/security/55291X109) | — | $6.8M | 165.86% |
| [Massachusetts Development Finance Agency](https://search.stillhousedata.com/security/57585BQE1) | — | $5.5M | 135.01% |
| [Commonwealth of Massachusetts Transportation Fund Revenue](https://search.stillhousedata.com/security/57604TLX2) | — | $5.2M | 128.35% |
| [Massachusetts Development Finance Agency](https://search.stillhousedata.com/security/57585BEX2) | — | $5.0M | 122.69% |
| [Massachusetts Clean Water Trust (The)](https://search.stillhousedata.com/security/575829QC3) | — | $4.2M | 103.69% |
| [Massachusetts Bay Transportation Authority Sales Tax Revenue](https://search.stillhousedata.com/security/5755792J5) | — | $4.2M | 102.68% |
| [Commonwealth of Massachusetts](https://search.stillhousedata.com/security/57582TFF4) | — | $4.2M | 102.13% |
| [Massachusetts School Building Authority](https://search.stillhousedata.com/security/576000WX7) | — | $4.2M | 101.69% |
| [Massachusetts School Building Authority](https://search.stillhousedata.com/security/576000E41) | — | $4.1M | 101.26% |
| [Commonwealth of Massachusetts Transportation Fund Revenue](https://search.stillhousedata.com/security/57604TLG9) | — | $4.1M | 101.01% |
| [Tri-County Regional Vocational Technical School District/MA](https://search.stillhousedata.com/security/895541CU2) | — | $3.9M | 95.35% |
| [Massachusetts Development Finance Agency](https://search.stillhousedata.com/security/57584YC98) | — | $3.7M | 90.11% |
| [Puerto Rico Sales Tax Financing Corp. Sales Tax Revenue](https://search.stillhousedata.com/security/74529JPX7) | — | $3.6M | 88.51% |
| [Massachusetts Development Finance Agency](https://search.stillhousedata.com/security/57585BHQ4) | — | $3.6M | 88.40% |
| [Massachusetts Port Authority](https://search.stillhousedata.com/security/575896ZA6) | — | $3.6M | 88.07% |

## Net asset history

| Report date | Net assets |
| --- | --- |
| 2026-03-31 | $408.8M |
| 2025-12-31 | $401.0M |
| 2025-09-30 | $394.0M |
| 2025-06-30 | $382.8M |
| 2025-03-31 | $389.9M |
| 2024-12-31 | $385.6M |
| 2024-09-30 | $377.9M |
| 2024-06-30 | $360.2M |

## More

- [Registrant: MFS Municipal Series Trust](https://search.stillhousedata.com/registrant/751656)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/fund/S000002534.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

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Source: public SEC filing data via Adviser Search (https://search.stillhousedata.com).
Agents: this data is also queryable via MCP tools and read-only SQL — see https://search.stillhousedata.com/llms.txt.