# MFS Municipal High Income Fund

MFS Municipal High Income Fund is a registered fund series of MFS Series Trust III (series S000002429). Net assets $5.4B as of 2026-04-30.

## Profile

- Series ID: S000002429
- Registrant: MFS Series Trust III
- LEI: ONQWW5HXR3GSM1QTA655
- Net assets: $5.4B
- Total assets: $5.4B
- As of: 2026-04-30

## 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) | — | $128.2M | 237.16% |
| [Puerto Rico Sales Tax Financing Corp. Sales Tax Revenue](https://search.stillhousedata.com/security/74529JPX7) | — | $100.0M | 184.98% |
| [Berks County Municipal Authority (The)](https://search.stillhousedata.com/security/084538JH1) | — | $31.8M | 58.80% |
| [Buckeye Tobacco Settlement Financing Authority](https://search.stillhousedata.com/security/118217CZ9) | — | $31.1M | 57.57% |
| [California Community Choice Financing Authority](https://search.stillhousedata.com/security/13013JCM6) | — | $27.0M | 49.94% |
| [New York Transportation Development Corp.](https://search.stillhousedata.com/security/650116GZ3) | — | $24.7M | 45.73% |
| [New Hampshire Business Finance Authority](https://search.stillhousedata.com/security/63610TAA4) | — | $24.3M | 44.93% |
| [City of Chicago IL](https://search.stillhousedata.com/security/167486M22) | — | $24.1M | 44.55% |
| [New York Transportation Development Corp.](https://search.stillhousedata.com/security/650116HR0) | — | $23.6M | 43.69% |
| [Iowa Tobacco Settlement Authority](https://search.stillhousedata.com/security/888805CJ5) | — | $22.8M | 42.17% |
| [New Hampshire Business Finance Authority](https://search.stillhousedata.com/security/63607YCW8) | — | $20.4M | 37.74% |
| [Chicago Board of Education Dedicated Capital Improvement Tax](https://search.stillhousedata.com/security/167510AA4) | — | $20.1M | 37.16% |
| [Pennsylvania Economic Development Financing Authority](https://search.stillhousedata.com/security/70868YAX7) | — | $18.8M | 34.76% |
| [Black Belt Energy Gas District](https://search.stillhousedata.com/security/09182TJC2) | — | $18.7M | 34.60% |
| [New York Transportation Development Corp.](https://search.stillhousedata.com/security/650116GY6) | — | $18.1M | 33.52% |

## Net asset history

| Report date | Net assets |
| --- | --- |
| 2026-04-30 | $5.4B |
| 2026-01-31 | $5.3B |
| 2025-10-31 | $5.1B |
| 2025-07-31 | $4.8B |
| 2025-04-30 | $4.8B |
| 2025-01-31 | $4.7B |
| 2024-10-31 | $4.5B |
| 2024-07-31 | $4.4B |

## More

- [Registrant: MFS Series Trust III](https://search.stillhousedata.com/registrant/225604)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/fund/S000002429.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

---

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.