# EDGAR Filing Document

**Accession Number:** 0000356349
**File Stem:** 0001741773-25-002643
**Filing Date:** 2025-7
**Character Count:** 4069
**Document Hash:** b142b1b81e76fc0b5275a52fd868218e
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001741773-25-002643.hdr.sgml**: 20250702

**ACCESSION NUMBER**: 0001741773-25-002643

**CONFORMED SUBMISSION TYPE**: 497J

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20250702

**DATE AS OF CHANGE**: 20250702

**EFFECTIVENESS DATE**: 20250702

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MFS SERIES TRUST XIII
- **CENTRAL INDEX KEY:** 0000356349

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

**FILING VALUES:**
- **FORM TYPE:** 497J
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 002-74959
- **FILM NUMBER:** 251099398

**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 GOVERNMENT SECURITIES FUND
- **DATE OF NAME CHANGE:** 19930408

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MFS GOVERNMENT GUARANTEED SECURITIES TRUST
- **DATE OF NAME CHANGE:** 19910522

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** WORKING CAPITAL TRUST
- **DATE OF NAME CHANGE:** 19840529

## Series and Classes Contracts Data

### MFS Government Securities Fund (Series ID: S000000693)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000002006 | I            | MGSIX           |
| C000002007 | A            | MFGSX           |
| C000002008 | R4           | MFGJX           |
| C000002012 | B            | MFGBX           |
| C000002013 | C            | MFGDX           |
| C000002015 | R1           | MFGGX           |
| C000002017 | R2           | MGVSX           |
| C000002018 | R3           | MFGHX           |
| C000117927 | R6           | MFGKX           |

### MFS Diversified Income Fund (Series ID: S000012219)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000033358 | A            | DIFAX           |
| C000033359 | C            | DIFCX           |
| C000033360 | I            | DIFIX           |
| C000068409 | R1           | DIFDX           |
| C000068410 | R2           | DIFEX           |
| C000068411 | R3           | DIFFX           |
| C000068412 | R4           | DIFGX           |
| C000117928 | R6           | DIFHX           |

### MFS New Discovery Value Fund (Series ID: S000032712)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000100956 | A            | NDVAX           |
| C000100957 | B            | NDVBX           |
| C000100958 | C            | NDVCX           |
| C000100959 | I            | NDVIX           |
| C000100960 | R1           | NDVRX           |
| C000100961 | R2           | NDVSX           |
| C000100962 | R3           | NDVTX           |
| C000100963 | R4           | NDVUX           |
| C000117930 | R6           | NDVVX           |

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

#### 617-954-5000
July 2, 2025

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

100 F Street, N.E.

Washington, D.C. 20549

 **Re: MFS<sup>®</sup> Series Trust XIII (the "Trust") (File Nos. 2-74959 and 811-3327) on behalf of MFS<sup>®</sup> Diversified Income Fund, MFS<sup>®</sup> Government Securities Fund, and MFS<sup>®</sup> New Discovery Value 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 and the combined Statement of Additional Information for the Funds do not differ from those contained in Post-Effective Amendment No. 89 (the "Amendment") to the Trust's Registration Statement on Form N-1A. The Amendment was filed electronically on June 26, 2025.

Please call the undersigned at (617) 954-5843 or Jonathan Umana-Oliveira at (617) 954-5153 with any questions you may have.

Sincerely,

BRIAN E. LANGENFELD

Brian E. Langenfeld

Vice President and Managing Counsel

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