# MFS Municipal Income Fund

MFS Municipal Income Fund is a registered fund series of MFS Municipal Series Trust (series S000002536). Net assets $6.9B as of 2026-03-31.

## Profile

- Series ID: S000002536
- Registrant: MFS Municipal Series Trust
- LEI: EX1INFNFQVRO3N97PT04
- Net assets: $6.9B
- Total assets: $7.0B
- 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) | — | $168.4M | 242.46% |
| [Black Belt Energy Gas District](https://search.stillhousedata.com/security/09182THS9) | — | $36.5M | 52.58% |
| [Texas Municipal Gas Acquisition & Supply Corp. IV](https://search.stillhousedata.com/security/88256PAT7) | — | $32.5M | 46.77% |
| [Princeton Independent School District](https://search.stillhousedata.com/security/742395ZC3) | — | $29.6M | 42.67% |
| [New York Transportation Development Corp.](https://search.stillhousedata.com/security/650116HR0) | — | $29.2M | 41.97% |
| [New York Transportation Development Corp.](https://search.stillhousedata.com/security/650116GZ3) | — | $29.0M | 41.81% |
| [New Hampshire Business Finance Authority](https://search.stillhousedata.com/security/63610TAA4) | — | $28.6M | 41.20% |
| [California Community Choice Financing Authority](https://search.stillhousedata.com/security/13013JCM6) | — | $27.8M | 39.96% |
| [Black Belt Energy Gas District](https://search.stillhousedata.com/security/09182TDB0) | — | $25.1M | 36.11% |
| [New Hampshire Business Finance Authority](https://search.stillhousedata.com/security/63607YCW8) | — | $24.3M | 34.96% |
| [Puerto Rico Sales Tax Financing Corp. Sales Tax Revenue](https://search.stillhousedata.com/security/74529JPX7) | — | $23.2M | 33.40% |
| [Virginia Housing Development Authority](https://search.stillhousedata.com/security/92812WKY9) | — | $21.8M | 31.42% |
| [Pennsylvania Economic Development Financing Authority](https://search.stillhousedata.com/security/70868YAX7) | — | $21.8M | 31.40% |
| [Town of Queen Creek AZ](https://search.stillhousedata.com/security/74823NAS8) | — | $21.7M | 31.18% |
| [Connecticut State Health & Educational Facilities Authority](https://search.stillhousedata.com/security/20775DP22) | — | $21.4M | 30.78% |

## Net asset history

| Report date | Net assets |
| --- | --- |
| 2026-03-31 | $6.9B |
| 2025-12-31 | $6.6B |
| 2025-09-30 | $6.2B |
| 2025-06-30 | $5.8B |
| 2025-03-31 | $5.9B |
| 2024-12-31 | $6.0B |
| 2024-09-30 | $5.6B |
| 2024-06-30 | $5.2B |

## More

- [Registrant: MFS Municipal Series Trust](https://search.stillhousedata.com/registrant/751656)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/fund/S000002536.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.