# EDGAR Filing Document

**Accession Number:** 0000783740
**File Stem:** 0000912938-26-000567
**Filing Date:** 2026-5
**Character Count:** 4597
**Document Hash:** 2a3f35df5adeb99ae81dd3b618bea95e
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000912938-26-000567.hdr.sgml**: 20260512

**ACCESSION NUMBER**: 0000912938-26-000567

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20260512

**DATE AS OF CHANGE**: 20260512

**EFFECTIVENESS DATE**: 20260512

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MFS SERIES TRUST X
- **CENTRAL INDEX KEY:** 0000783740

**ORGANIZATION NAME:**
- **EIN:** 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:** 26966918

**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 Managed Wealth Fund (Series ID: S000045806)

---

|  |  |  |
|:---|:---|:---|
| Class Name | Ticker Symbol | Class ID   |
| A          | MNWAX         | C000142775 |
| B          | MNWBX         | C000142776 |
| C          | MNWCX         | C000142777 |
| I          | MNWIX         | C000142778 |
| R1         | MNWRX         | C000142779 |
| R2         | MNWSX         | C000142780 |
| R3         | MNWTX         | C000142781 |
| R4         | MNWUX         | C000142782 |
| R6         | MNWZX         | C000195688 |

---

## Series and Classes Contracts Data

### MFS Managed Wealth Fund (Series ID: S000045806)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000142775 | A            | MNWAX           |
| C000142776 | B            | MNWBX           |
| C000142777 | C            | MNWCX           |
| C000142778 | I            | MNWIX           |
| C000142779 | R1           | MNWRX           |
| C000142780 | R2           | MNWSX           |
| C000142781 | R3           | MNWTX           |
| C000142782 | R4           | MNWUX           |
| C000195688 | R6           | MNWZX           |

![](img_80bc136ca2ce4f1.jpg)

SUPPLEMENT TO THE PROSPECTUS

*Supplement dated May 12, 2026, to the Prospectus dated September 26, 2025.*

## MFS <sup>®</sup> Managed Wealth Fund
**Effective June 10, 2026, the sub-section entitled "Principal Investment Types" under the main heading entitled "Investment Objective, Strategies, and Risks" is restated in its entirety as follows:**

#### Principal Investment Types
The principal investment types in which the fund may invest are:

**MFS Growth Fund:** MFS Growth Fund is a mutual fund advised by MFS that normally invests at least 80% of the fund's net assets in growth companies. Growth companies are companies that MFS believes have above average potential with respect to the rate and duration of earnings growth compared to other companies. MFS primarily invests the fund's assets in securities of companies with large capitalizations.

**MFS International Equity Fund**: MFS International Equity Fund is a mutual fund advised by MFS that normally invests at least 80% of the fund's net assets in equity securities. MFS normally invests the fund's assets primarily in foreign securities, including emerging market securities. MFS may invest the fund's assets in securities of companies of any size.

**MFS Value Fund**: MFS Value Fund is a mutual fund advised by MFS that normally invests at least 80% of the fund's net assets in value companies. Value companies are companies that MFS believes are undervalued compared to their perceived worth in the marketplace. MFS primarily invests the fund's assets in securities of companies with large capitalizations.

**Derivatives:** Derivatives are financial contracts whose value is based on the value of one or more underlying indicators or the difference between underlying indicators. Underlying indicators may include a security or other financial instrument, asset, currency, interest rate, credit rating, commodity, volatility measure, or index. Derivatives involve a counterparty to the transaction. Derivatives include futures, forward contracts, options, swaps, and certain complex structured securities.

MGW-SUP-I-051226

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