# EDGAR Filing Document

**Accession Number:** 0000751656
**File Stem:** 0000912938-26-000287
**Filing Date:** 2026-3
**Character Count:** 2811
**Document Hash:** 0988c93532d1cb0188bfc56721065f95
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000912938-26-000287.hdr.sgml**: 20260305

**ACCESSION NUMBER**: 0000912938-26-000287

**CONFORMED SUBMISSION TYPE**: 497K

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20260305

**DATE AS OF CHANGE**: 20260305

**EFFECTIVENESS DATE**: 20260305

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MFS MUNICIPAL SERIES TRUST
- **CENTRAL INDEX KEY:** 0000751656

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 0331

**FILING VALUES:**
- **FORM TYPE:** 497K
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 002-92915
- **FILM NUMBER:** 26724347

**BUSINESS ADDRESS:**
- **STREET 1:** 111 HUNTINGTON AVENUE
- **STREET 2:** 21ST FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02199
- **BUSINESS PHONE:** 18006372929

**MAIL ADDRESS:**
- **STREET 1:** 111 HUNTINGTON AVENUE
- **STREET 2:** 21ST FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02199

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MFS MANAGED MULTI STATE MUNICIPAL BOND TRUST
- **DATE OF NAME CHANGE:** 19920703

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MFS MANAGED MULTI STATE TAX EXEMPT TRUST
- **DATE OF NAME CHANGE:** 19890410

## Series and Classes Contracts Data

### MFS Maryland Municipal Bond Fund (Series ID: S000002533)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000006985 | A            | MFSMX           |
| C000006986 | B            | MBMDX           |
| C000169769 | I            | MMDIX           |
| C000194249 | R6           | MPMDX           |

![](img_97df4726a3ab4f1.jpg)

SUPPLEMENT TO THE SUMMARY PROSPECTUS

*The date of this supplement is March 5, 2026.*

---

| | |
|:---|:---|
| MFS<sup>®</sup> ALABAMA MUNICIPAL BOND FUND | MFS<sup>®</sup> NEW YORK MUNICIPAL BOND FUND |
| MFS<sup>®</sup> ARKANSAS MUNICIPAL BOND FUND | MFS<sup>®</sup> NORTH CAROLINA MUNICIPAL BOND FUND |
| MFS<sup>®</sup> CALIFORNIA MUNICIPAL BOND FUND | MFS<sup>®</sup> PENNSYLVANIA MUNICIPAL BOND FUND |
| MFS<sup>®</sup> GEORGIA MUNICIPAL BOND FUND | MFS<sup>®</sup> SOUTH CAROLINA MUNICIPAL BOND FUND |
| MFS<sup>®</sup> MARYLAND MUNICIPAL BOND FUND | MFS<sup>®</sup> VIRGINIA MUNICIPAL BOND FUND |
| MFS<sup>®</sup> MASSACHUSETTS MUNICIPAL BOND FUND | MFS<sup>®</sup> WEST VIRGINIA MUNICIPAL BOND FUND |
| MFS<sup>®</sup> MISSISSIPPI MUNICIPAL BOND FUND |  |

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**Effective March 31, 2026, the following is added to the table in the sub-section entitled "Portfolio Manager(s)" under the main heading entitled "Summary of Key Information":**

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Portfolio Manager** | &nbsp;&nbsp;**Since** | &nbsp;&nbsp;&nbsp;**Title** |
| &nbsp;&nbsp;Thomas Compton | &nbsp;&nbsp;March 2026 | &nbsp;&nbsp;&nbsp;Investment Officer of MFS |

---

MULTI-SUM-SUP-II-030526

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