# EDGAR Filing Document

**Accession Number:** 0000783740
**File Stem:** 0001752724-25-177379
**Filing Date:** 2025-7
**Character Count:** 12982
**Document Hash:** 57d5873560aee7cd746cecfb4191f69d
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001752724-25-177379.hdr.sgml**: 20250725

**ACCESSION NUMBER**: 0001752724-25-177379

**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:** 251148689

**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 Moderate Allocation Fund (Series ID: S000002507)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000006851 | A            | MAMAX           |
| C000006852 | R4           | MAMJX           |
| C000006856 | B            | MMABX           |
| C000006857 | C            | MMACX           |
| C000006858 | I            | MMAIX           |
| C000006860 | R1           | MAMFX           |
| C000006862 | R2           | MARRX           |
| C000006863 | R3           | MAMHX           |
| C000231059 | R6           | MAMPX           |

## 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 Moderate Allocation Fund

- **b. EDGAR series identifier (if any):** S000002507

- **c. LEI of Series:** 6W9PGRTO8WIPR5M6Z061

**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:** $6415384225.44

**Total Liabilities:** $2355033.93

**Net Assets:** $6413029191.51

**Monthly Return Information**

| Class               | Month 1 Return (%)   | Month 2 Return (%)   | Month 3 Return (%)   |
|:---|:---|:---|:---|
| Class ID C000006858 | -2.03%               | 0.46%                | 3.09%                |
| Class ID C000231059 | -2.01%               | 0.46%                | 3.09%                |
| Class ID C000006860 | -2.13%               | 0.38%                | 3.01%                |
| Class ID C000006852 | -2.02%               | 0.47%                | 3.05%                |
| Class ID C000006857 | -2.13%               | 0.37%                | 2.97%                |
| Class ID C000006863 | -2.04%               | 0.42%                | 3.03%                |
| Class ID C000006851 | -2.07%               | 0.42%                | 3.05%                |
| Class ID C000006856 | -2.08%               | 0.37%                | 2.98%                |
| Class ID C000006862 | -2.08%               | 0.43%                | 3.04%                |

**Monthly Gains & Losses**

| Period   | Net Realized Gain/Loss   | Net Unrealized Appreciation/Depreciation   |
|:---|:---|:---|
| Month 1  | $-6194393.87             | $-138540058.54                             |
| Month 2  | $-47429450.38            | $66465863.73                               |
| Month 3  | $358396.02               | $184349712.59                              |

### 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        |  65311420 | NS      | $557759524.86 | 8.70%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Emerging Markets Debt Fund                | MFS Emerging Markets Debt Fund                | CUSIP: 552746364<br>LEI: 509D6AOZZ4SJ08T5BZ82 | Long             | EC               | RF                | US        |  15183599 | NS      | $180988494.58 | 2.82%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Research International Fund               | MFS Research International Fund               | CUSIP: 55273H361<br>LEI: UH91KW1VFNZQF5FY7237 | Long             | EC               | RF                | US        |  13487967 | NS      | $341245558.72 | 5.32%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Emerging Markets Equity Fund              | MFS Emerging Markets Equity Fund              | CUSIP: 552746331<br>LEI: GLINMRWNKCBOHYKQ2131 | Long             | EC               | RF                | US        |   1762939 | NS      | $67238483.35  | 1.05%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Growth Fund                               | MFS Growth Fund                               | CUSIP: 552985673<br>LEI: K4ZYIH3WSXKUSPKIPM59 | Long             | EC               | RF                | US        |   2467163 | NS      | $504534879.31 | 7.87%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS International New Discovery Fund          | MFS International New Discovery Fund          | CUSIP: 552981383<br>LEI: RC53GXLQZ5LVIZBRHR66 | Long             | EC               | RF                | US        |   2029203 | NS      | $67511594.36  | 1.05%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS New Discovery Value Fund                  | MFS New Discovery Value Fund                  | CUSIP: 552982696<br>LEI: LRMRW30Z8FYTIFW1W860 | Long             | EC               | RF                | US        |   5794600 | NS      | $99261490.79  | 1.55%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS High Income Fund                          | MFS High Income Fund                          | CUSIP: 552984684<br>LEI: DMVGFZCV67YA34LSI126 | Long             | EC               | RF                | US        |  79396295 | NS      | $245334552.80 | 3.83%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS International Intrinsic Value Fund        | MFS International Intrinsic Value Fund        | CUSIP: 552746349<br>LEI: 7540QFSKYNTDFH7HAK24 | Long             | EC               | RF                | US        |   3261807 | NS      | $136604470.12 | 2.13%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Mid Cap Growth Fund                       | MFS Mid Cap Growth Fund                       | CUSIP: 552987554<br>LEI: XPX0WXKIO6CLKBLYF666 | Long             | EC               | RF                | US        |  14905222 | NS      | $481587737.52 | 7.51%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Global Real Estate Fund                   | MFS Global Real Estate Fund                   | CUSIP: 552982720<br>LEI: ROYDM6SL56ZXYAENS860 | Long             | EC               | RF                | US        |  12056725 | NS      | $198574258.28 | 3.10%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS New Discovery Fund                        | MFS New Discovery Fund                        | CUSIP: 55273H346<br>LEI: ZVEMRLDGMDO1D1VDSU87 | Long             | EC               | RF                | US        |   3348144 | NS      | $102051439.91 | 1.59%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Institutional Money Market Portfolio      | MFS Institutional Money Market Portfolio      | CUSIP: 55291X109<br>LEI: 5L2W638H85N8T1136O07 | Long             | EC               | RF                | US        | 147446997 | NS      | $147446996.84 | 2.30%             |  |  |  | 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        |   8834440 | NS      | $138524025.57 | 2.16%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Research Fund                             | MFS Research Fund                             | CUSIP: 552981391<br>LEI: XFPOOG2XVG5TW1LZ8588 | Long             | EC               | RF                | US        |   8515982 | NS      | $490435406.09 | 7.65%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Research Bond Fund                        | MFS Research Bond Fund                        | CUSIP: 55274K603<br>LEI: FJAEEQMSDDUK9QL2E558 | Long             | EC               | RF                | US        |  53255762 | NS      | $502734394.22 | 7.84%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Global Opportunistic Bond Fund            | MFS Global Opportunistic Bond Fund            | CUSIP: 552743882<br>LEI: XE280U8NKIY4V6K1JN70 | Long             | EC               | RF                | US        |  36531911 | NS      | $297004433.62 | 4.63%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Value Fund                                | MFS Value Fund                                | CUSIP: 55273H353<br>LEI: HV6C0RMURVKFUQ3UTB42 | Long             | EC               | RF                | US        |  10401096 | NS      | $522863090.64 | 8.15%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Inflation Adjusted Bond Fund              | MFS Inflation Adjusted Bond Fund              | CUSIP: 55274K884<br>LEI: VOHO802M9IKG3IZTEN75 | Long             | EC               | RF                | US        |  45231500 | NS      | $414320537.55 | 6.46%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Commodity Strategy Fund                   | MFS Commodity Strategy Fund                   | CUSIP: 55276T826<br>LEI: T0OEQ8I3F6DXUJCOV412 | Long             | EC               | RF                | US        |  50132027 | NS      | $183984540.67 | 2.87%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Mid Cap Value Fund                        | MFS Mid Cap Value Fund                        | CUSIP: 55273W475<br>LEI: BXHSCSBXYY1DOHP6E209 | Long             | EC               | RF                | US        |  14867273 | NS      | $463264235.00 | 7.22%             |  |  |  | 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        |  22189327 | NS      | $124704016.18 | 1.94%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS International Growth Fund                 | MFS International Growth Fund                 | CUSIP: 552746356<br>LEI: PTNAY8DC4VJYOKVJ5B83 | Long             | EC               | RF                | US        |   2904016 | NS      | $135269082.05 | 2.11%             |  |  |  | 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