# EDGAR Filing Document

**Accession Number:** 0000225604
**File Stem:** 0001741773-25-002473
**Filing Date:** 2025-6
**Character Count:** 4590
**Document Hash:** 8f4c79ad341ff937ab10555d430b359b
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001741773-25-002473.hdr.sgml**: 20250604

**ACCESSION NUMBER**: 0001741773-25-002473

**CONFORMED SUBMISSION TYPE**: 497J

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20250604

**DATE AS OF CHANGE**: 20250604

**EFFECTIVENESS DATE**: 20250604

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MFS SERIES TRUST III
- **CENTRAL INDEX KEY:** 0000225604

**ORGANIZATION NAME:**
- **EIN:** 046414785
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 0131

**FILING VALUES:**
- **FORM TYPE:** 497J
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 002-60491
- **FILM NUMBER:** 251022082

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

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

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MFS SERIES TRUST III /MA
- **DATE OF NAME CHANGE:** 19940411

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MFS HIGH INCOME FUND
- **DATE OF NAME CHANGE:** 19930408

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MASSACHUSETTS FINANCIAL HIGH INCOME TRUST
- **DATE OF NAME CHANGE:** 19920703

## Series and Classes Contracts Data

### MFS High Income Fund (Series ID: S000002427)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000006471 | A            | MHITX           |
| C000006472 | R4           | MHIJX           |
| C000006476 | B            | MHIBX           |
| C000006477 | C            | MHICX           |
| C000006478 | I            | MHIIX           |
| C000006480 | R1           | MHIGX           |
| C000006482 | R2           | MIHRX           |
| C000006483 | R3           | MHIHX           |
| C000116932 | R6           | MHIKX           |

### MFS Global High Yield Fund (Series ID: S000002428)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000006484 | A            | MHOAX           |
| C000006485 | B            | MHOBX           |
| C000006486 | C            | MHOCX           |
| C000006487 | I            | MHOIX           |
| C000064677 | R1           | MHORX           |
| C000064678 | R2           | MHOSX           |
| C000064679 | R3           | MHOTX           |
| C000064680 | R4           | MHOUX           |
| C000064681 | R6           | MHOVX           |

### MFS Municipal High Income Fund (Series ID: S000002429)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000006488 | A            | MMHYX           |
| C000006489 | B            | MMHBX           |
| C000006490 | C            | MMHCX           |
| C000103072 | I            | MMIIX           |
| C000191232 | R6           | MMHKX           |

### MFS High Yield Pooled Portfolio (Series ID: S000038262)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000118060 | Fund Shares  | HYPPX           |

#### 111 Huntington Avenue, Boston, Massachusetts 02199

#### 617-954-5000
June 4, 2025

#### VIA EDGAR
United States Securities and Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549

 **Re: MFS<sup>®</sup> Series Trust III (the "Trust") (File Nos. 2-60491 and 811-2794) on behalf of MFS<sup>®</sup> Global High Yield Fund, MFS<sup>®</sup> High Income Fund, MFS<sup>®</sup> High Yield Pooled Portfolio, and MFS<sup>®</sup> Municipal High Income Fund (the "Funds")** 

Ladies and Gentlemen:

Pursuant to Rule 497(j) under the Securities Act of 1933, as amended, please accept this letter on behalf of the Trust as certification that the Prospectuses for MFS<sup>®</sup> Global Equity Series, MFS<sup>®</sup> Investors Trust Series, MFS<sup>®</sup> Mid Cap Growth Series, MFS<sup>®</sup> New Discovery Series, MFS<sup>®</sup> Research Series, MFS<sup>®</sup> Total Return Bond Series, MFS<sup>®</sup> Total Return Series, MFS<sup>®</sup> Utilities Series, and MFS<sup>®</sup> Value Series and the Statement of Additional Information for the Funds do not differ from those contained in Post-Effective Amendment No. 74 (the "Amendment") to the Trust's Registration Statement on Form N-1A. The Amendment was filed electronically on May 29, 2025. The Prospectus for MFS<sup>®</sup> Growth Series, as supplemented, has been filed separately pursuant to Rule 497(c) under the Securities Act of 1933.

Please call the undersigned at 617-954-5655 or Danielle Jaffe at 617-954-5546 with any questions you may have.

Sincerely,

WILLIAM B. WILSON

William B. Wilson

Assistant Vice President and Senior Counsel

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