# EDGAR Filing Document

**Accession Number:** 0000783740
**File Stem:** 0001752724-23-009174
**Filing Date:** 2023-1
**Character Count:** 13005
**Document Hash:** fe2d51ed37315bb8b703a6ab3ad3db47
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001752724-23-009174.hdr.sgml**: 20230124

**ACCESSION NUMBER**: 0001752724-23-009174

**CONFORMED SUBMISSION TYPE**: NPORT-P

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20221130

**FILED AS OF DATE**: 20230124

**DATE AS OF CHANGE**: 20230124

**PERIOD START**: 20230531

**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:** NPORT-P
- **SEC ACT:** 1940 Act
- **SEC FILE NUMBER:** 811-04492
- **FILM NUMBER:** 23546027

**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:** 2023-05-31

- **b. Date as of which information is reported:** 2022-11-30

**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:** $6435512931.43

**Total Liabilities:** $6116975.08

**Net Assets:** $6429395956.35

**Cash Not Reported:** $889732.72

**Monthly Return Information**

| Class               | Month 1 Return (%)   | Month 2 Return (%)   | Month 3 Return (%)   |
|:---|:---|:---|:---|
| Class ID C000006858 | -7.31%               | 3.60%                | 5.99%                |
| Class ID C000231059 | -7.29%               | 3.60%                | 5.99%                |
| Class ID C000006860 | -7.40%               | 3.53%                | 5.92%                |
| Class ID C000006852 | -7.33%               | 3.66%                | 5.98%                |
| Class ID C000006857 | -7.43%               | 3.56%                | 5.88%                |
| Class ID C000006863 | -7.35%               | 3.57%                | 5.98%                |
| Class ID C000006851 | -7.33%               | 3.60%                | 5.92%                |
| Class ID C000006856 | -7.37%               | 3.52%                | 5.89%                |
| Class ID C000006862 | -7.37%               | 3.57%                | 5.96%                |

**Monthly Gains & Losses**

| Period   | Net Realized Gain/Loss   | Net Unrealized Appreciation/Depreciation   |
|:---|:---|:---|
| Month 1  | $-2880576.17             | $-484957905.37                             |
| Month 2  | $-2229025.24             | $210345753.94                              |
| Month 3  | $2044631.04              | $355978030.19                              |

### 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        |  70338834 | NS      | $615464799.45 | 9.57%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Emerging Markets Debt Fund                | MFS Emerging Markets Debt Fund                | CUSIP: 552746364<br>LEI: 509D6AOZZ4SJ08T5BZ82 | Long             | EC               | RF                | US        |  16657818 | NS      | $193563843.08 | 3.01%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Research International Fund               | MFS Research International Fund               | CUSIP: 55273H361<br>LEI: UH91KW1VFNZQF5FY7237 | Long             | EC               | RF                | US        |  16454731 | NS      | $336663805.20 | 5.24%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Emerging Markets Equity Fund              | MFS Emerging Markets Equity Fund              | CUSIP: 552746331<br>LEI: GLINMRWNKCBOHYKQ2131 | Long             | EC               | RF                | US        |   2201357 | NS      | $66370922.53  | 1.03%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Growth Fund                               | MFS Growth Fund                               | CUSIP: 552985673<br>LEI: K4ZYIH3WSXKUSPKIPM59 | Long             | EC               | RF                | US        |   3571362 | NS      | $513133335.70 | 7.98%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS International New Discovery Fund          | MFS International New Discovery Fund          | CUSIP: 552981383<br>LEI: RC53GXLQZ5LVIZBRHR66 | Long             | EC               | RF                | US        |   2139622 | NS      | $66563629.16  | 1.04%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS New Discovery Value Fund                  | MFS New Discovery Value Fund                  | CUSIP: 552982696<br>LEI: LRMRW30Z8FYTIFW1W860 | Long             | EC               | RF                | US        |   5335088 | NS      | $98699127.63  | 1.54%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS High Income Fund                          | MFS High Income Fund                          | CUSIP: 552984684<br>LEI: DMVGFZCV67YA34LSI126 | Long             | EC               | RF                | US        |  84918847 | NS      | $249661410.73 | 3.88%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS International Intrinsic Value Fund        | MFS International Intrinsic Value Fund        | CUSIP: 552746349<br>LEI: 7540QFSKYNTDFH7HAK24 | Long             | EC               | RF                | US        |   3156475 | NS      | $133455781.73 | 2.08%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Mid Cap Growth Fund                       | MFS Mid Cap Growth Fund                       | CUSIP: 552987554<br>LEI: XPX0WXKIO6CLKBLYF666 | Long             | EC               | RF                | US        |  18036900 | NS      | $457776520.12 | 7.12%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Global Real Estate Fund                   | MFS Global Real Estate Fund                   | CUSIP: 552982720<br>LEI: ROYDM6SL56ZXYAENS860 | Long             | EC               | RF                | US        |  11480650 | NS      | $195515465.38 | 3.04%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS New Discovery Fund                        | MFS New Discovery Fund                        | CUSIP: 55273H346<br>LEI: ZVEMRLDGMDO1D1VDSU87 | Long             | EC               | RF                | US        |   3576840 | NS      | $96395850.96  | 1.50%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Institutional Money Market Portfolio      | MFS Institutional Money Market Portfolio      | CUSIP: 55291X109<br>LEI: 5L2W638H85N8T1136O07 | Long             | STIV             | RF                | US        |   5477548 | NS      | $5477547.75   | 0.09%             |  |  |  | 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        |  11039915 | NS      | $135570157.06 | 2.11%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Research Fund                             | MFS Research Fund                             | CUSIP: 552981391<br>LEI: XFPOOG2XVG5TW1LZ8588 | Long             | EC               | RF                | US        |   9887073 | NS      | $519763420.78 | 8.08%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Research Bond Fund                        | MFS Research Bond Fund                        | CUSIP: 55274K603<br>LEI: FJAEEQMSDDUK9QL2E558 | Long             | EC               | RF                | US        |  59263408 | NS      | $557668672.95 | 8.67%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Global Opportunistic Bond Fund            | MFS Global Opportunistic Bond Fund            | CUSIP: 552743882<br>LEI: XE280U8NKIY4V6K1JN70 | Long             | EC               | RF                | US        |  39438971 | NS      | $311962260.33 | 4.85%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Value Fund                                | MFS Value Fund                                | CUSIP: 55273H353<br>LEI: HV6C0RMURVKFUQ3UTB42 | Long             | EC               | RF                | US        |  10158626 | NS      | $529061231.87 | 8.23%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Inflation Adjusted Bond Fund              | MFS Inflation Adjusted Bond Fund              | CUSIP: 55274K884<br>LEI: VOHO802M9IKG3IZTEN75 | Long             | EC               | RF                | US        |  45096602 | NS      | $432025442.65 | 6.72%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Commodity Strategy Fund                   | MFS Commodity Strategy Fund                   | CUSIP: 55276T826<br>LEI: T0OEQ8I3F6DXUJCOV412 | Long             | EC               | RF                | US        |  36808239 | NS      | $183305029.91 | 2.85%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Mid Cap Value Fund                        | MFS Mid Cap Value Fund                        | CUSIP: 55273W475<br>LEI: BXHSCSBXYY1DOHP6E209 | Long             | EC               | RF                | US        |  14878213 | NS      | $458992872.16 | 7.14%             |  |  |  | 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        |  24393530 | NS      | $128309968.99 | 2.00%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS International Growth Fund                 | MFS International Growth Fund                 | CUSIP: 552746356<br>LEI: PTNAY8DC4VJYOKVJ5B83 | Long             | EC               | RF                | US        |   3523742 | NS      | $135382158.23 | 2.11%             |  |  |  | No            |                  1 | On Loan: No      |

### Signature

**Date Signed:** 2022-12-14

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

**Signature:** Kasey Phillips

**Name of Signer:** Kasey Phillips

**Title:** Assistant Treasurer