# EDGAR Filing Document

**Accession Number:** 0000783740
**File Stem:** 0001752724-23-009161
**Filing Date:** 2023-1
**Character Count:** 12627
**Document Hash:** bd8b5b1e988432c6b43a362075754245
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001752724-23-009161.hdr.sgml**: 20230124

**ACCESSION NUMBER**: 0001752724-23-009161

**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:** 23546012

**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 Growth Allocation Fund (Series ID: S000002514)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000006911 | A            | MAGWX           |
| C000006912 | R4           | MAGJX           |
| C000006916 | B            | MBGWX           |
| C000006917 | C            | MCGWX           |
| C000006918 | I            | MGWIX           |
| C000006920 | R1           | MAGMX           |
| C000006922 | R2           | MGALX           |
| C000006923 | R3           | MAGEX           |
| C000231061 | R6           | MAGQX           |

## 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 Growth Allocation Fund

- **b. EDGAR series identifier (if any):** S000002514

- **c. LEI of Series:** HFZEG2KP0JEQZXYL2D08

**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:** $6050194963.00

**Total Liabilities:** $5780185.81

**Net Assets:** $6044414777.19

**Monthly Return Information**

| Class               | Month 1 Return (%)   | Month 2 Return (%)   | Month 3 Return (%)   |
|:---|:---|:---|:---|
| Class ID C000006920 | -8.39%               | 4.92%                | 6.88%                |
| Class ID C000006912 | -8.34%               | 5.02%                | 6.96%                |
| Class ID C000006911 | -8.34%               | 4.98%                | 6.97%                |
| Class ID C000006922 | -8.35%               | 4.96%                | 6.97%                |
| Class ID C000006918 | -8.29%               | 5.01%                | 6.97%                |
| Class ID C000006916 | -8.37%               | 4.92%                | 6.89%                |
| Class ID C000006917 | -8.41%               | 4.95%                | 6.85%                |
| Class ID C000231061 | -8.33%               | 5.06%                | 6.96%                |
| Class ID C000006923 | -8.34%               | 4.97%                | 6.94%                |

**Monthly Gains & Losses**

| Period   | Net Realized Gain/Loss   | Net Unrealized Appreciation/Depreciation   |
|:---|:---|:---|
| Month 1  | $-389809.67              | $-502729785.51                             |
| Month 2  | $724581.16               | $266757857.39                              |
| Month 3  | $4713711.91              | $387529029.58                              |

### 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 Emerging Markets Debt Fund                | MFS Emerging Markets Debt Fund                | CUSIP: 552746364<br>LEI: 509D6AOZZ4SJ08T5BZ82 | Long             | EC               | RF                | US        |  15392938 | NS      | $178865934.87 | 2.96%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Research International Fund               | MFS Research International Fund               | CUSIP: 55273H361<br>LEI: UH91KW1VFNZQF5FY7237 | Long             | EC               | RF                | US        |  21035493 | NS      | $430386194.21 | 7.12%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Emerging Markets Equity Fund              | MFS Emerging Markets Equity Fund              | CUSIP: 552746331<br>LEI: GLINMRWNKCBOHYKQ2131 | Long             | EC               | RF                | US        |   3948109 | NS      | $119035493.74 | 1.97%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Growth Fund                               | MFS Growth Fund                               | CUSIP: 552985673<br>LEI: K4ZYIH3WSXKUSPKIPM59 | Long             | EC               | RF                | US        |   4052307 | NS      | $582235475.65 | 9.63%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS International New Discovery Fund          | MFS International New Discovery Fund          | CUSIP: 552981383<br>LEI: RC53GXLQZ5LVIZBRHR66 | Long             | EC               | RF                | US        |   3905976 | NS      | $121514903.81 | 2.01%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS New Discovery Value Fund                  | MFS New Discovery Value Fund                  | CUSIP: 552982696<br>LEI: LRMRW30Z8FYTIFW1W860 | Long             | EC               | RF                | US        |   6695429 | NS      | $123865428.92 | 2.05%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS High Income Fund                          | MFS High Income Fund                          | CUSIP: 552984684<br>LEI: DMVGFZCV67YA34LSI126 | Long             | EC               | RF                | US        |  80628980 | NS      | $237049200.08 | 3.92%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS International Intrinsic Value Fund        | MFS International Intrinsic Value Fund        | CUSIP: 552746349<br>LEI: 7540QFSKYNTDFH7HAK24 | Long             | EC               | RF                | US        |   4343046 | NS      | $183623988.26 | 3.04%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Mid Cap Growth Fund                       | MFS Mid Cap Growth Fund                       | CUSIP: 552987554<br>LEI: XPX0WXKIO6CLKBLYF666 | Long             | EC               | RF                | US        |  21407467 | NS      | $543321513.83 | 8.99%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Global Real Estate Fund                   | MFS Global Real Estate Fund                   | CUSIP: 552982720<br>LEI: ROYDM6SL56ZXYAENS860 | Long             | EC               | RF                | US        |  13404882 | NS      | $228285142.40 | 3.78%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS New Discovery Fund                        | MFS New Discovery Fund                        | CUSIP: 55273H346<br>LEI: ZVEMRLDGMDO1D1VDSU87 | Long             | EC               | RF                | US        |   4386921 | NS      | $118227512.65 | 1.96%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Institutional Money Market Portfolio      | MFS Institutional Money Market Portfolio      | CUSIP: 55291X109<br>LEI: 5L2W638H85N8T1136O07 | Long             | STIV             | RF                | US        |   9223632 | NS      | $9223632.06   | 0.15%             |  |  |  | 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        |  15300959 | NS      | $187895778.04 | 3.11%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Research Fund                             | MFS Research Fund                             | CUSIP: 552981391<br>LEI: XFPOOG2XVG5TW1LZ8588 | Long             | EC               | RF                | US        |  11647219 | NS      | $612294316.97 | 10.13%            |  |  |  | No            |                  1 | On Loan: No      |
| MFS Research Bond Fund                        | MFS Research Bond Fund                        | CUSIP: 55274K603<br>LEI: FJAEEQMSDDUK9QL2E558 | Long             | EC               | RF                | US        |  18417502 | NS      | $173308694.83 | 2.87%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Global Opportunistic Bond Fund            | MFS Global Opportunistic Bond Fund            | CUSIP: 552743882<br>LEI: XE280U8NKIY4V6K1JN70 | Long             | EC               | RF                | US        |  22261492 | NS      | $176088398.48 | 2.91%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Value Fund                                | MFS Value Fund                                | CUSIP: 55273H353<br>LEI: HV6C0RMURVKFUQ3UTB42 | Long             | EC               | RF                | US        |  12125099 | NS      | $631475169.20 | 10.45%            |  |  |  | No            |                  1 | On Loan: No      |
| MFS Inflation Adjusted Bond Fund              | MFS Inflation Adjusted Bond Fund              | CUSIP: 55274K884<br>LEI: VOHO802M9IKG3IZTEN75 | Long             | EC               | RF                | US        |  29970576 | NS      | $287118118.86 | 4.75%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Commodity Strategy Fund                   | MFS Commodity Strategy Fund                   | CUSIP: 55276T826<br>LEI: T0OEQ8I3F6DXUJCOV412 | Long             | EC               | RF                | US        |  45748192 | NS      | $227825998.35 | 3.77%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS Mid Cap Value Fund                        | MFS Mid Cap Value Fund                        | CUSIP: 55273W475<br>LEI: BXHSCSBXYY1DOHP6E209 | Long             | EC               | RF                | US        |  18138160 | NS      | $559562227.08 | 9.26%             |  |  |  | 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        |  22780365 | NS      | $119824722.21 | 1.98%             |  |  |  | No            |                  1 | On Loan: No      |
| MFS International Growth Fund                 | MFS International Growth Fund                 | CUSIP: 552746356<br>LEI: PTNAY8DC4VJYOKVJ5B83 | Long             | EC               | RF                | US        |   4901382 | NS      | $188311112.85 | 3.12%             |  |  |  | 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