# EDGAR Filing Document

**Accession Number:** 0000783740
**File Stem:** 0001752724-25-177392
**Filing Date:** 2025-7
**Character Count:** 10457
**Document Hash:** d70dfa455092551e47434b47fbb81a67
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001752724-25-177392.hdr.sgml**: 20250725

**ACCESSION NUMBER**: 0001752724-25-177392

**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:** 251148702

**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 Aggressive Growth Allocation Fund (Series ID: S000002506)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000006838 | A            | MAAGX           |
| C000006839 | R4           | MAALX           |
| C000006843 | B            | MBAGX           |
| C000006844 | C            | MCAGX           |
| C000006845 | I            | MIAGX           |
| C000006847 | R1           | MAAFX           |
| C000006849 | R2           | MAWAX           |
| C000006850 | R3           | MAAHX           |
| C000231058 | R6           | AGGPX           |

## 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 Aggressive Growth Allocation Fund

- **b. EDGAR series identifier (if any):** S000002506

- **c. LEI of Series:** 549300UEFZYWREX0YF53

**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:** $2863266151.99

**Total Liabilities:** $1270956.49

**Net Assets:** $2861995195.50

**Monthly Return Information**

| Class               | Month 1 Return (%)   | Month 2 Return (%)   | Month 3 Return (%)   |
|:---|:---|:---|:---|
| Class ID C000006845 | -3.00%               | 0.20%                | 5.03%                |
| Class ID C000006838 | -3.04%               | 0.17%                | 5.02%                |
| Class ID C000006843 | -3.08%               | 0.10%                | 4.94%                |
| Class ID C000006849 | -3.06%               | 0.17%                | 4.98%                |
| Class ID C000006847 | -3.10%               | 0.11%                | 4.93%                |
| Class ID C000006844 | -3.11%               | 0.14%                | 4.92%                |
| Class ID C000006850 | -3.04%               | 0.17%                | 5.03%                |
| Class ID C000006839 | -3.03%               | 0.20%                | 5.06%                |
| Class ID C000231058 | -3.00%               | 0.20%                | 5.03%                |

**Monthly Gains & Losses**

| Period   | Net Realized Gain/Loss   | Net Unrealized Appreciation/Depreciation   |
|:---|:---|:---|
| Month 1  | $-657293.61              | $-86392482.27                              |
| Month 2  | $-9925879.24             | $14916891.38                               |
| Month 3  | $-609203.84              | $138411218.02                              |

### 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 Research International Fund          | MFS Research International Fund          | CUSIP: 55273H361<br>LEI: UH91KW1VFNZQF5FY7237 | Long             | EC               | RF                | US        |   9207906 | NS      | $232960015.50 | 8.14%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Emerging Markets Equity Fund         | MFS Emerging Markets Equity Fund         | CUSIP: 552746331<br>LEI: GLINMRWNKCBOHYKQ2131 | Long             | EC               | RF                | US        |   2252208 | NS      | $85899217.93  | 3.00%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Growth Fund                          | MFS Growth Fund                          | CUSIP: 552985673<br>LEI: K4ZYIH3WSXKUSPKIPM59 | Long             | EC               | RF                | US        |   1631270 | NS      | $333594654.47 | 11.66%            |  |  |  | No            |                  1 | On Loan: No      |
| MFS International New Discovery Fund     | MFS International New Discovery Fund     | CUSIP: 552981383<br>LEI: RC53GXLQZ5LVIZBRHR66 | Long             | EC               | RF                | US        |   3458054 | NS      | $115049455.78 | 4.02%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS New Discovery Value Fund             | MFS New Discovery Value Fund             | CUSIP: 552982696<br>LEI: LRMRW30Z8FYTIFW1W860 | Long             | EC               | RF                | US        |   4130307 | NS      | $70752156.92  | 2.47%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS International Intrinsic Value Fund   | MFS International Intrinsic Value Fund   | CUSIP: 552746349<br>LEI: 7540QFSKYNTDFH7HAK24 | Long             | EC               | RF                | US        |   3478803 | NS      | $145692266.33 | 5.09%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Mid Cap Growth Fund                  | MFS Mid Cap Growth Fund                  | CUSIP: 552987554<br>LEI: XPX0WXKIO6CLKBLYF666 | Long             | EC               | RF                | US        |   9072271 | NS      | $293125081.66 | 10.24%            |  |  |  | No            |                  1 | On Loan: No      |
| MFS Global Real Estate Fund              | MFS Global Real Estate Fund              | CUSIP: 552982720<br>LEI: ROYDM6SL56ZXYAENS860 | Long             | EC               | RF                | US        |   8584517 | NS      | $141386998.02 | 4.94%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS New Discovery Fund                   | MFS New Discovery Fund                   | CUSIP: 55273H346<br>LEI: ZVEMRLDGMDO1D1VDSU87 | Long             | EC               | RF                | US        |   2380308 | NS      | $72551795.34  | 2.54%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Institutional Money Market Portfolio | MFS Institutional Money Market Portfolio | CUSIP: 55291X109<br>LEI: 5L2W638H85N8T1136O07 | Long             | EC               | RF                | US        |  37601566 | NS      | $37601566.19  | 1.31%             |  |  |  | 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        |   9405775 | NS      | $147482547.63 | 5.15%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Research Fund                        | MFS Research Fund                        | CUSIP: 552981391<br>LEI: XFPOOG2XVG5TW1LZ8588 | Long             | EC               | RF                | US        |   5147001 | NS      | $296415765.82 | 10.36%            |  |  |  | No            |                  1 | On Loan: No      |
| MFS Value Fund                           | MFS Value Fund                           | CUSIP: 55273H353<br>LEI: HV6C0RMURVKFUQ3UTB42 | Long             | EC               | RF                | US        |   6622677 | NS      | $332921967.06 | 11.63%            |  |  |  | No            |                  1 | On Loan: No      |
| MFS Commodity Strategy Fund              | MFS Commodity Strategy Fund              | CUSIP: 55276T826<br>LEI: T0OEQ8I3F6DXUJCOV412 | Long             | EC               | RF                | US        |  35303049 | NS      | $129562191.18 | 4.53%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Mid Cap Value Fund                   | MFS Mid Cap Value Fund                   | CUSIP: 55273W475<br>LEI: BXHSCSBXYY1DOHP6E209 | Long             | EC               | RF                | US        |   9064517 | NS      | $282450346.57 | 9.87%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS International Growth Fund            | MFS International Growth Fund            | CUSIP: 552746356<br>LEI: PTNAY8DC4VJYOKVJ5B83 | Long             | EC               | RF                | US        |   3092939 | NS      | $144069107.14 | 5.03%             |  |  |  | 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