# EDGAR Filing Document

**Accession Number:** 0000783740
**File Stem:** 0000912938-23-000230
**Filing Date:** 2023-2
**Character Count:** 5241
**Document Hash:** 6395f476d0e7ed8c88ffe9c2bd6a0d0c
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000912938-23-000230.hdr.sgml**: 20230209

**ACCESSION NUMBER**: 0000912938-23-000230

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20230209

**DATE AS OF CHANGE**: 20230209

**EFFECTIVENESS DATE**: 20230209

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MFS SERIES TRUST X
- **CENTRAL INDEX KEY:** 0000783740
- **IRS NUMBER:** 000000000
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 1130

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-01657
- **FILM NUMBER:** 23601376

**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 MORTGAGE FUND
- **DATE OF NAME CHANGE:** 19930408

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MFS GOVERNMENT INCOME PLUS FUND
- **DATE OF NAME CHANGE:** 19930312

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MASSACHUSETTS MFS GOVERNMENT INCOME PLUS FUND
- **DATE OF NAME CHANGE:** 19921015

## Series and Classes Contracts Data

### MFS Emerging Markets Debt Local Currency Fund (Series ID: S000033795)

---

|  |  |  |
|:---|:---|:---|
| Class Name | Ticker Symbol | Class ID   |
| A          | EMLAX         | C000104416 |
| B          | EMLBX         | C000104417 |
| C          | EMLCX         | C000104418 |
| I          | EMLIX         | C000104419 |
| R1         | EMLJX         | C000104420 |
| R2         | EMLKX         | C000104421 |
| R3         | EMLLX         | C000104422 |
| R4         | EMLMX         | C000104423 |
| R6         | EMLNX         | C000123138 |

---

## Series and Classes Contracts Data

### MFS Emerging Markets Debt Local Currency Fund (Series ID: S000033795)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000104416 | A            | EMLAX           |
| C000104417 | B            | EMLBX           |
| C000104418 | C            | EMLCX           |
| C000104419 | I            | EMLIX           |
| C000104420 | R1           | EMLJX           |
| C000104421 | R2           | EMLKX           |
| C000104422 | R3           | EMLLX           |
| C000104423 | R4           | EMLMX           |
| C000123138 | R6           | EMLNX           |

![](image0.jpg)

SUPPLEMENT TO THE PROSPECTUS

*Supplement dated February 9, 2023, to the Prospectus dated February 28, 2022.*

MFS<sup>®</sup> Emerging Markets Debt Local Currency Fund

------

**Effective March 31, 2023, the following is added to the table in the section entitled "Portfolio Manager(s)" under the main heading entitled "Summary of Key Information":**

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;&nbsp; **Portfolio Manager** | &nbsp;&nbsp;&nbsp; **Since** | &nbsp;&nbsp;&nbsp; **Title** |
| &nbsp;&nbsp; Neeraj Arora | &nbsp;&nbsp;&nbsp; March 2023 | &nbsp;&nbsp;&nbsp; Investment Officer of MFS |

---

**Effective immediately, the following is added after the tables in the sections entitled "Portfolio Manager(s)" under the main headings entitled "Summary of Key Information" and "Management of the Fund":**

Effective April 30, 2024, Matt Ryan will no longer be a portfolio manager of the fund.

**Effective March 31, 2023, the following is added to the table in the section entitled "Portfolio Manager(s)" under the main heading entitled "Management of the Fund":**

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;&nbsp; **Portfolio Manager** | &nbsp;&nbsp;&nbsp; **Primary Role** | &nbsp;&nbsp;&nbsp; **Five Year History** |
| &nbsp;&nbsp; Neeraj Arora | &nbsp;&nbsp; Portfolio Manager | &nbsp;&nbsp; Employed in the investment area of MFS since 2011 |

---

1050252&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; EML-SUP-I-020923

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