# EDGAR Filing Document

**Accession Number:** 0000783740
**File Stem:** 0001752724-25-177389
**Filing Date:** 2025-7
**Character Count:** 12651
**Document Hash:** f464ebf36b64aea5abda8e986df72a8c
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001752724-25-177389.hdr.sgml**: 20250725

**ACCESSION NUMBER**: 0001752724-25-177389

**CONFORMED SUBMISSION TYPE**: NPORT-P

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20250531

**FILED AS OF DATE**: 20250725

**DATE AS OF CHANGE**: 20250725

**PERIOD START**: 20250531

**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:** NPORT-P
- **SEC ACT:** 1940 Act
- **SEC FILE NUMBER:** 811-04492
- **FILM NUMBER:** 251148697

**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 Conservative Allocation Fund (Series ID: S000002510)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000006887 | A            | MACFX           |
| C000006888 | R4           | MACJX           |
| C000006892 | B            | MACBX           |
| C000006893 | C            | MACVX           |
| C000006894 | I            | MACIX           |
| C000006896 | R1           | MACKX           |
| C000006898 | R2           | MCARX           |
| C000006899 | R3           | MACNX           |
| C000231060 | R6           | MACQX           |

## Form NPORT-P: Monthly Portfolio Investments Report

### NPORT-P: Part A: General Information

**Item A.1. Information about the Registrant.**

- **a. Name of Registrant:** MFS SERIES TRUST X

- **b. Investment Company Act file number:** 811-04492

- **c. CIK number of Registrant:** 0000783740

- **d. LEI of Registrant:** 5493001MUVNRNUPJY164

- **e. Address and telephone number of Registrant.**

  - **Street Address 1:** 111 HUNTINGTON AVENUE

  - **City:** BOSTON

  - **State:** MA

  - **Foreign country:** US

  - **Zip / Postal Code:** 02199

  - **Telephone number:** 617-954-5000

**Item A.2. Information about the Series.**

- **a. Name of Series:** MFS Conservative Allocation Fund

- **b. EDGAR series identifier (if any):** S000002510

- **c. LEI of Series:** 6SXR8MWKSFNSF7VYA207

**Item A.3. Reporting period.**

- **a. Date of fiscal year-end:** 2025-05-31

- **b. Date as of which information is reported:** 2025-05-31

**Item A.4. Final filing**

Does the Fund anticipate that this will be its final filing on Form N-PORT? **No**

### Fund Information

**Total Assets:** $3653508649.20

**Total Liabilities:** $1035071.88

**Net Assets:** $3652473577.32

**Monthly Return Information**

| Class               | Month 1 Return (%)   | Month 2 Return (%)   | Month 3 Return (%)   |
|:---|:---|:---|:---|
| Class ID C000006899 | -1.40%               | 0.18%                | 1.85%                |
| Class ID C000006898 | -1.37%               | 0.13%                | 1.83%                |
| Class ID C000006896 | -1.44%               | 0.13%                | 1.78%                |
| Class ID C000006893 | -1.46%               | 0.06%                | 1.80%                |
| Class ID C000006888 | -1.39%               | 0.18%                | 1.88%                |
| Class ID C000006894 | -1.32%               | 0.18%                | 1.86%                |
| Class ID C000006892 | -1.45%               | 0.12%                | 1.77%                |
| Class ID C000006887 | -1.39%               | 0.18%                | 1.82%                |
| Class ID C000231060 | -1.37%               | 0.18%                | 1.86%                |

**Monthly Gains & Losses**

| Period   | Net Realized Gain/Loss   | Net Unrealized Appreciation/Depreciation   |
|:---|:---|:---|
| Month 1  | $-3532725.50             | $-56898843.86                              |
| Month 2  | $-6936749.41             | $6480974.98                                |
| Month 3  | $451693.46               | $60178440.31                               |

### Schedule of Portfolio Investments

| Name                                          | Title                                         | Identifiers                                   | Payoff Profile   | Asset Category   | Issuer Category   | Country   |   Balance | Units   | Value (USD)   | % of Net Assets   | Maturity Date   | Coupon Type   | Annualized Rate (%)   | Restricted?   |   Fair Value Level | Lending Status   |
|:---|:---|:---|:---|:---|:---|:---|---:|:---|:---|:---|:---|:---|:---|:---|---:|:---|
| MFS Government Securities Fund                | MFS Government Securities Fund                | CUSIP: 552982712<br>LEI: UWWK6TDSOPDQSQMMEB12 | Long             | EC               | RF                | US        |  39979500 | NS      | $341424930.23 | 9.35%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Emerging Markets Debt Fund                | MFS Emerging Markets Debt Fund                | CUSIP: 552746364<br>LEI: 509D6AOZZ4SJ08T5BZ82 | Long             | EC               | RF                | US        |   6106417 | NS      | $72788489.92  | 1.99%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Research International Fund               | MFS Research International Fund               | CUSIP: 55273H361<br>LEI: UH91KW1VFNZQF5FY7237 | Long             | EC               | RF                | US        |   5257236 | NS      | $133008065.46 | 3.64%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Growth Fund                               | MFS Growth Fund                               | CUSIP: 552985673<br>LEI: K4ZYIH3WSXKUSPKIPM59 | Long             | EC               | RF                | US        |    962766 | NS      | $196885671.54 | 5.39%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS New Discovery Value Fund                  | MFS New Discovery Value Fund                  | CUSIP: 552982696<br>LEI: LRMRW30Z8FYTIFW1W860 | Long             | EC               | RF                | US        |   2087647 | NS      | $35761391.72  | 0.98%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS High Income Fund                          | MFS High Income Fund                          | CUSIP: 552984684<br>LEI: DMVGFZCV67YA34LSI126 | Long             | EC               | RF                | US        |  47359980 | NS      | $146342338.33 | 4.01%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS International Intrinsic Value Fund        | MFS International Intrinsic Value Fund        | CUSIP: 552746349<br>LEI: 7540QFSKYNTDFH7HAK24 | Long             | EC               | RF                | US        |   1358035 | NS      | $56874494.07  | 1.56%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Mid Cap Growth Fund                       | MFS Mid Cap Growth Fund                       | CUSIP: 552987554<br>LEI: XPX0WXKIO6CLKBLYF666 | Long             | EC               | RF                | US        |   4608009 | NS      | $148884762.45 | 4.08%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Global Real Estate Fund                   | MFS Global Real Estate Fund                   | CUSIP: 552982720<br>LEI: ROYDM6SL56ZXYAENS860 | Long             | EC               | RF                | US        |   4481859 | NS      | $73816213.63  | 2.02%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS New Discovery Fund                        | MFS New Discovery Fund                        | CUSIP: 55273H346<br>LEI: ZVEMRLDGMDO1D1VDSU87 | Long             | EC               | RF                | US        |   1201853 | NS      | $36632488.68  | 1.00%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Institutional Money Market Portfolio      | MFS Institutional Money Market Portfolio      | CUSIP: 55291X109<br>LEI: 5L2W638H85N8T1136O07 | Long             | EC               | RF                | US        |  83032694 | NS      | $83032693.75  | 2.27%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS International Large Cap Value Fund        | MFS International Large Cap Value Fund        | CUSIP: 552743445<br>LEI: 549300YEW2NKJCMQAR75 | Long             | EC               | RF                | US        |   3673933 | NS      | $57607266.52  | 1.58%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Research Fund                             | MFS Research Fund                             | CUSIP: 552981391<br>LEI: XFPOOG2XVG5TW1LZ8588 | Long             | EC               | RF                | US        |   3374558 | NS      | $194340808.70 | 5.32%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Research Bond Fund                        | MFS Research Bond Fund                        | CUSIP: 55274K603<br>LEI: FJAEEQMSDDUK9QL2E558 | Long             | EC               | RF                | US        |  55426847 | NS      | $523229434.56 | 14.33%            |  |  |  | No            |                  1 | On Loan: No      |
| MFS Global Opportunistic Bond Fund            | MFS Global Opportunistic Bond Fund            | CUSIP: 552743882<br>LEI: XE280U8NKIY4V6K1JN70 | Long             | EC               | RF                | US        |  31214788 | NS      | $253776227.43 | 6.95%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Value Fund                                | MFS Value Fund                                | CUSIP: 55273H353<br>LEI: HV6C0RMURVKFUQ3UTB42 | Long             | EC               | RF                | US        |   4387399 | NS      | $220554539.18 | 6.04%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Inflation Adjusted Bond Fund              | MFS Inflation Adjusted Bond Fund              | CUSIP: 55274K884<br>LEI: VOHO802M9IKG3IZTEN75 | Long             | EC               | RF                | US        |  39426981 | NS      | $361151141.67 | 9.89%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Commodity Strategy Fund                   | MFS Commodity Strategy Fund                   | CUSIP: 55276T826<br>LEI: T0OEQ8I3F6DXUJCOV412 | Long             | EC               | RF                | US        |  19176913 | NS      | $70379269.82  | 1.93%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Ltd Maturity Fund                         | MFS Ltd Maturity Fund                         | CUSIP: 55274K801<br>LEI: 7ER38PJ2TK60L3Y32478 | Long             | EC               | RF                | US        |  61845534 | NS      | $363033284.26 | 9.94%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Mid Cap Value Fund                        | MFS Mid Cap Value Fund                        | CUSIP: 55273W475<br>LEI: BXHSCSBXYY1DOHP6E209 | Long             | EC               | RF                | US        |   4678146 | NS      | $145771040.89 | 3.99%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Emerging Markets Debt Local Currency Fund | MFS Emerging Markets Debt Local Currency Fund | CUSIP: 552746323<br>LEI: 5493001KPK8UJ27DMD68 | Long             | EC               | RF                | US        |  13050125 | NS      | $73341701.04  | 2.01%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS International Growth Fund                 | MFS International Growth Fund                 | CUSIP: 552746356<br>LEI: PTNAY8DC4VJYOKVJ5B83 | Long             | EC               | RF                | US        |   1208044 | NS      | $56270700.33  | 1.54%             |  |  |  | No            |                  1 | On Loan: No      |

### Signature

**Date Signed:** 2025-06-13

**Name of Applicant:** MFS SERIES TRUST X

**Signature:** James Byrne

**Name of Signer:** James Byrne

**Title:** Assistant Treasurer