# EDGAR Filing Document

**Accession Number:** 0000063068
**File Stem:** 0001410368-25-033464
**Filing Date:** 2025-12
**Character Count:** 32847
**Document Hash:** be05f9233d98cd4b0a9ca122b4bf1237
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001410368-25-033464.hdr.sgml**: 20251205

**ACCESSION NUMBER**: 0001410368-25-033464

**CONFORMED SUBMISSION TYPE**: N-MFP3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20251130

**FILED AS OF DATE**: 20251205

**DATE AS OF CHANGE**: 20251205

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MFS SERIES TRUST IV
- **CENTRAL INDEX KEY:** 0000063068

**ORGANIZATION NAME:**
- **EIN:** 046382595
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 1031

**FILING VALUES:**
- **FORM TYPE:** N-MFP3
- **SEC ACT:** 1940 Act
- **SEC FILE NUMBER:** 811-02594
- **FILM NUMBER:** 251551420

**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 MUNICIPAL BOND FUND /MA/
- **DATE OF NAME CHANGE:** 19930910

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MASSACHUSETTS CASH MANAGEMENT TRUST
- **DATE OF NAME CHANGE:** 19920703

## Series and Classes Contracts Data

### MFS U.S. Government Money Market Fund (Series ID: S000002435)

| Class ID   | Class Name                           | Ticker Symbol   |
|:---|:---|:---|
| C000006517 | MFS U.S.Government Money Market Fund | MCMXX           |

# Form N-MFP3: Monthly Schedule of Portfolio Holdings

## N-MFP: Filer Information
**Submission Type:** N-MFP3
**CIK:** 0000063068

### General Information

**Report for (YYYY-MM-DD):** 2025-11-30

**Registrant Full Name:** MFS SERIES TRUST IV

**CIK Number of Registrant:** 0000063068

**LEI of Registrant:** 549300SSA281MOJG8J61

**Name of Series:** MFS U.S. Government Money Market Fund

**LEI of Series:** MQMNIX2D6ZVLO9HEKW73

**EDGAR Series Identifier:** S000002435

**Total number of share classes in the series:** 1

**Is this the fund's final filing on Form N-MFP?:** No

**Has the fund acquired or merged with another fund?:** No

## Part A: Series-Level Information about the Fund

### Service Providers
| Role                          | Details                                            | File/CIK Number   |
|:---|:---|:---|
| Investment Adviser            | Massachusetts Financial Services Company           | 801-17352         |
| Independent Public Accountant | Deloitte & Touche LLP<br>City: Boston<br>State: MA |  |
| Administrator                 | Massachusetts Financial Services Company           |  |
| Transfer Agent                | MFS Service Center, Inc<br>CIK: 0000769188         | 084-01316         |

### Fund Characteristics & Assets

- **Securities Act File Number:** 002-54607

- **Is this a Feeder Fund?:** No

- **Is this a Master Fund?:** No

- **Is this series for insurance company separate accounts?:** No

- **Money Market Fund Category:** Government

- **Is this a Retail Money Market Fund?:** No

- **Is this a Government Money Market Fund?:** No

- **WAM:** 32 days

- **WAL:** 32 days

- **Total Value of Portfolio Securities:** $345559248.97

- **Amortized Cost of Portfolio Securities:** $345569260.50

- **Cash:** $1.05

- **Total Other Assets:** $92086.66

- **Total Liabilities:** $1091315.89

- **Net Assets of Series:** $344570032.32

- **Number of Shares Outstanding (Series):** 344570523.7840

- **Does the fund seek to maintain a stable price per share?:** Yes

- **Stable Price Per Share:** $1.00

- **Is cash management vehicle an affiliated fund?:** No

- **Does the fund apply liquidity fees?:** No

### Daily & Weekly Liquid Assets
| Date       | Daily Liquid Assets ($)   | Weekly Liquid Assets ($)   | Daily Liquid Assets (%)   | Weekly Liquid Assets (%)   |
|:---|:---|:---|:---|:---|
| 2025-11-03 | $210478202.81             | $275754482.46              | 60.9900%                  | 79.9100%                   |
| 2025-11-04 | $210100207.18             | $275383825.96              | 60.9500%                  | 79.8800%                   |
| 2025-11-05 | $209076368.51             | $274367900.19              | 60.8300%                  | 79.8200%                   |
| 2025-11-06 | $209287945.68             | $274590355.35              | 60.8500%                  | 79.8300%                   |
| 2025-11-07 | $209892225.16             | $275196555.70              | 60.9100%                  | 79.8600%                   |
| 2025-11-10 | $221878656.20             | $275610383.49              | 64.3100%                  | 79.8800%                   |
| 2025-11-11 | $221879491.67             | $275616786.18              | 64.2800%                  | 79.8500%                   |
| 2025-11-12 | $221100238.15             | $274840178.51              | 64.2000%                  | 79.8000%                   |
| 2025-11-13 | $210894889.62             | $293584951.35              | 61.2800%                  | 85.3100%                   |
| 2025-11-14 | $210855509.30             | $293553679.32              | 61.2700%                  | 85.3100%                   |
| 2025-11-17 | $211385822.13             | $294110093.73              | 61.3400%                  | 85.3400%                   |
| 2025-11-18 | $210848042.33             | $293582303.40              | 61.2700%                  | 85.3200%                   |
| 2025-11-19 | $210540357.55             | $293285290.47              | 61.2400%                  | 85.3000%                   |
| 2025-11-20 | $211003010.93             | $293755784.36              | 61.2800%                  | 85.3200%                   |
| 2025-11-21 | $212647533.71             | $297348990.49              | 61.4800%                  | 85.9700%                   |
| 2025-11-24 | $212490920.26             | $297223765.89              | 61.4600%                  | 85.9700%                   |
| 2025-11-25 | $212300461.62             | $297038102.25              | 61.3900%                  | 85.8900%                   |
| 2025-11-26 | $212463126.30             | $297212101.84              | 61.4500%                  | 85.9600%                   |
| 2025-11-28 | $212297495.79             | $307510463.59              | 61.4200%                  | 88.9600%                   |

### 7-Day Gross Yield
| Date       | 7-Day Gross Yield   |
|:---|:---|
| 2025-11-03 | 4.0800%             |
| 2025-11-04 | 4.0600%             |
| 2025-11-05 | 4.0300%             |
| 2025-11-06 | 4.0300%             |
| 2025-11-07 | 3.9800%             |
| 2025-11-10 | 3.9700%             |
| 2025-11-11 | 3.9700%             |
| 2025-11-12 | 3.9700%             |
| 2025-11-13 | 3.9800%             |
| 2025-11-14 | 3.9700%             |
| 2025-11-17 | 3.9700%             |
| 2025-11-18 | 3.9700%             |
| 2025-11-19 | 3.9600%             |
| 2025-11-20 | 3.9600%             |
| 2025-11-21 | 3.9500%             |
| 2025-11-24 | 3.9500%             |
| 2025-11-25 | 3.9500%             |
| 2025-11-26 | 3.9700%             |
| 2025-11-28 | 3.9900%             |

### Daily Net Asset Value per Share (Series)
| Date       | Net Asset Value per Share   |
|:---|:---|
| 2025-11-03 | 1.0000                      |
|  |  |
| 2025-11-04 | 1.0000                      |
|  |  |
| 2025-11-05 | 1.0000                      |
|  |  |
| 2025-11-06 | 1.0001                      |
|  |  |
| 2025-11-07 | 0.9999                      |
|  |  |
| 2025-11-10 | 1.0001                      |
|  |  |
| 2025-11-11 | 1.0000                      |
|  |  |
| 2025-11-12 | 1.0000                      |
|  |  |
| 2025-11-13 | 1.0000                      |
|  |  |
| 2025-11-14 | 0.9999                      |
|  |  |
| 2025-11-17 | 1.0000                      |
|  |  |
| 2025-11-18 | 1.0000                      |
|  |  |
| 2025-11-19 | 1.0000                      |
|  |  |
| 2025-11-20 | 1.0000                      |
|  |  |
| 2025-11-21 | 0.9999                      |
|  |  |
| 2025-11-24 | 1.0000                      |
|  |  |
| 2025-11-25 | 1.0000                      |
|  |  |
| 2025-11-26 | 1.0000                      |
|  |  |
| 2025-11-28 | 1.0000                      |
|  |  |

## Part B: Class-Level Information about the Fund

### Class: A

- **Minimum Initial Investment:** $1000.00

- **Net Assets of Class:** $344570032.32

- **Number of Shares Outstanding:** 344570523.7840

- **Expense Reimbursement/Waiver:** 44641.00

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2025-11-03 | 1.0000          |
|  |  |
| 2025-11-04 | 1.0000          |
|  |  |
| 2025-11-05 | 1.0000          |
|  |  |
| 2025-11-06 | 1.0001          |
|  |  |
| 2025-11-07 | 0.9999          |
|  |  |
| 2025-11-10 | 1.0001          |
|  |  |
| 2025-11-11 | 1.0000          |
|  |  |
| 2025-11-12 | 1.0000          |
|  |  |
| 2025-11-13 | 1.0000          |
|  |  |
| 2025-11-14 | 0.9999          |
|  |  |
| 2025-11-17 | 1.0000          |
|  |  |
| 2025-11-18 | 1.0000          |
|  |  |
| 2025-11-19 | 1.0000          |
|  |  |
| 2025-11-20 | 1.0000          |
|  |  |
| 2025-11-21 | 0.9999          |
|  |  |
| 2025-11-24 | 1.0000          |
|  |  |
| 2025-11-25 | 1.0000          |
|  |  |
| 2025-11-26 | 1.0000          |
|  |  |
| 2025-11-28 | 1.0000          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2025-11-03 | $1109080.86               | $270680.87              |
| 2025-11-04 | $67828.74                 | $380961.34              |
| 2025-11-05 | $266200.26                | $1319002.29             |
| 2025-11-06 | $528411.09                | $345820.32              |
| 2025-11-07 | $940042.90                | $377579.43              |
| 2025-11-10 | $488092.57                | $153601.55              |
| 2025-11-11 | $146585.27                | $853017.83              |
| 2025-11-12 | $205191.13                | $159532.87              |
| 2025-11-13 | $142061.82                | $461707.66              |
| 2025-11-14 | $365716.66                | $486946.60              |
| 2025-11-17 | $640893.24                | $346679.97              |
| 2025-11-18 | $467170.71                | $861445.27              |
| 2025-11-19 | $182700.65                | $489559.49              |
| 2025-11-20 | $653379.80                | $203065.47              |
| 2025-11-21 | $1712910.30               | $234267.97              |
| 2025-11-24 | $26146.84                 | $207659.61              |
| 2025-11-25 | $334293.12                | $268804.05              |
| 2025-11-26 | $344338.56                | $377867.04              |
| 2025-11-28 | $294450.47                | $512217.21              |

**Total Gross Subscriptions (Month):** $8915494.99

**Total Gross Redemptions (Month):** $8310416.84

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2025-11-03 | 3.6300%           |
| 2025-11-04 | 3.6100%           |
| 2025-11-05 | 3.5900%           |
| 2025-11-06 | 3.5800%           |
| 2025-11-07 | 3.5400%           |
| 2025-11-10 | 3.5300%           |
| 2025-11-11 | 3.5300%           |
| 2025-11-12 | 3.5300%           |
| 2025-11-13 | 3.5300%           |
| 2025-11-14 | 3.5300%           |
| 2025-11-17 | 3.5300%           |
| 2025-11-18 | 3.5200%           |
| 2025-11-19 | 3.5200%           |
| 2025-11-20 | 3.5100%           |
| 2025-11-21 | 3.5100%           |
| 2025-11-24 | 3.5000%           |
| 2025-11-25 | 3.5100%           |
| 2025-11-26 | 3.5200%           |
| 2025-11-28 | 3.5500%           |

**Beneficial/Record Owner Categories**
| Category      | Other Category   | Record Owner %   | Beneficial Owner %   |
|:---|:---|:---|:---|
| Broker-dealer |  | 37.0500%         | 0.0000%              |
| Broker-dealer |  | 5.1200%          | 0.0000%              |

## Part C: Schedule of Portfolio Securities

### Security 1: Bank of America NA

- **C.1 - Title:** Bank of America NA 4.050000%
- **C.6 - Investment Category:** U.S. Treasury Repurchase Agreement, if collateralized only by U.S. Treasuries (including Strips) and cash
- **Identifiers:** C.3 - CUSIP: 03199T002, C.3 - LEI: 549300HN4UKV1E2R3U73, C.5 - Other ID: 03199T002_4.05_1201
- **C.18 - Value (incl. sponsor support):** $64911000.00
- **C.18.a - Value (excl. sponsor support):** $64911000.00
- **C.19 - Percentage of Net Assets:** 18.8400%
- **C.17 - Yield as of Reporting Date:** 4.0500%
- **C.11 - Maturity Date (WAM):** 2025-12-01
- **C.12 - Maturity Date (WAL):** 2025-12-01
- **C.13 - Final Legal Maturity Date:** 2025-12-01
- **Characteristics:** C.9 Eligible Security? Yes, C.14 Has Demand Feature? No, C.15 Has Guarantee? No, C.16 Has Enhancement? No, C.22 Is an Illiquid Security? No, C.20 Is a Daily Liquid Asset? Yes, C.21 Is a Weekly Liquid Asset? Yes, C.23 Categorized at Level 3? No

**C.8 - Repurchase Agreement Details:**

- **Is Open?:** No

- **Is Cleared?:** No

- **Is Tri-party?:** No

**Collateral:**
| Issuer Name        | Maturity Date   | Coupon   | Yield   | Principal Amount   | Collateral Value   | Category                           |
|:---|:---|:---|:---|:---|:---|:---|
| U.S. Treasury Bond | 2031-08-31      | 3.7500%  | 0.0000% | $65522000.00       | $66351262.81       | U.S. Treasuries (including strips) |

### Security 2: Federal Farm Credit Bank

- **C.1 - Title:** Federal Farm Credit Bank
- **C.6 - Investment Category:** U.S. Government Agency Debt (if categorized as no-coupon discount notes)
- **Identifiers:** C.3 - CUSIP: 313313QA9, C.4 - ISIN: US313313QA90, C.3 - LEI: 254900C5LP6DN9OP9V83
- **C.18 - Value (incl. sponsor support):** $9395365.24
- **C.18.a - Value (excl. sponsor support):** $9395365.24
- **C.19 - Percentage of Net Assets:** 2.7300%
- **C.17 - Yield as of Reporting Date:** 3.5500%
- **C.11 - Maturity Date (WAM):** 2025-12-03
- **C.12 - Maturity Date (WAL):** 2025-12-03
- **C.13 - Final Legal Maturity Date:** 2025-12-03
- **Characteristics:** C.9 Eligible Security? Yes, C.14 Has Demand Feature? No, C.15 Has Guarantee? No, C.16 Has Enhancement? No, C.22 Is an Illiquid Security? No, C.20 Is a Daily Liquid Asset? No, C.21 Is a Weekly Liquid Asset? Yes, C.23 Categorized at Level 3? No

### Security 3: Federal Farm Credit Bank

- **C.1 - Title:** Federal Farm Credit Bank
- **C.6 - Investment Category:** U.S. Government Agency Debt (if categorized as no-coupon discount notes)
- **Identifiers:** C.3 - CUSIP: 313313QZ4, C.4 - ISIN: US313313QZ42, C.3 - LEI: 254900C5LP6DN9OP9V83
- **C.18 - Value (incl. sponsor support):** $6980672.23
- **C.18.a - Value (excl. sponsor support):** $6980672.23
- **C.19 - Percentage of Net Assets:** 2.0300%
- **C.17 - Yield as of Reporting Date:** 3.5500%
- **C.11 - Maturity Date (WAM):** 2025-12-26
- **C.12 - Maturity Date (WAL):** 2025-12-26
- **C.13 - Final Legal Maturity Date:** 2025-12-26
- **Characteristics:** C.9 Eligible Security? Yes, C.14 Has Demand Feature? No, C.15 Has Guarantee? No, C.16 Has Enhancement? No, C.22 Is an Illiquid Security? No, C.20 Is a Daily Liquid Asset? No, C.21 Is a Weekly Liquid Asset? Yes, C.23 Categorized at Level 3? No

### Security 4: Federal Farm Credit Bank

- **C.1 - Title:** Federal Farm Credit Bank
- **C.6 - Investment Category:** U.S. Government Agency Debt (if categorized as no-coupon discount notes)
- **Identifiers:** C.3 - CUSIP: 313313ST6, C.4 - ISIN: US313313ST63, C.3 - LEI: 254900C5LP6DN9OP9V83
- **C.18 - Value (incl. sponsor support):** $7942677.76
- **C.18.a - Value (excl. sponsor support):** $7942677.76
- **C.19 - Percentage of Net Assets:** 2.3100%
- **C.17 - Yield as of Reporting Date:** 3.6900%
- **C.11 - Maturity Date (WAM):** 2026-02-06
- **C.12 - Maturity Date (WAL):** 2026-02-06
- **C.13 - Final Legal Maturity Date:** 2026-02-06
- **Characteristics:** C.9 Eligible Security? Yes, C.14 Has Demand Feature? No, C.15 Has Guarantee? No, C.16 Has Enhancement? No, C.22 Is an Illiquid Security? No, C.20 Is a Daily Liquid Asset? No, C.21 Is a Weekly Liquid Asset? No, C.23 Categorized at Level 3? No

### Security 5: Federal Farm Credit Bank

- **C.1 - Title:** Federal Farm Credit Bank
- **C.6 - Investment Category:** U.S. Government Agency Debt (if categorized as no-coupon discount notes)
- **Identifiers:** C.3 - CUSIP: 313313TW8, C.4 - ISIN: US313313TW83, C.3 - LEI: 254900C5LP6DN9OP9V83
- **C.18 - Value (incl. sponsor support):** $6435548.86
- **C.18.a - Value (excl. sponsor support):** $6435548.86
- **C.19 - Percentage of Net Assets:** 1.8700%
- **C.17 - Yield as of Reporting Date:** 3.6800%
- **C.11 - Maturity Date (WAM):** 2026-03-05
- **C.12 - Maturity Date (WAL):** 2026-03-05
- **C.13 - Final Legal Maturity Date:** 2026-03-05
- **Characteristics:** C.9 Eligible Security? Yes, C.14 Has Demand Feature? No, C.15 Has Guarantee? No, C.16 Has Enhancement? No, C.22 Is an Illiquid Security? No, C.20 Is a Daily Liquid Asset? No, C.21 Is a Weekly Liquid Asset? No, C.23 Categorized at Level 3? No

### Security 6: Federal Farm Credit Bank

- **C.1 - Title:** Federal Farm Credit Bank
- **C.6 - Investment Category:** U.S. Government Agency Debt (if categorized as no-coupon discount notes)
- **Identifiers:** C.3 - CUSIP: 313313VU9, C.4 - ISIN: US313313VU99, C.3 - LEI: 254900C5LP6DN9OP9V83
- **C.18 - Value (incl. sponsor support):** $7884487.76
- **C.18.a - Value (excl. sponsor support):** $7884487.76
- **C.19 - Percentage of Net Assets:** 2.2900%
- **C.17 - Yield as of Reporting Date:** 3.6400%
- **C.11 - Maturity Date (WAM):** 2026-04-20
- **C.12 - Maturity Date (WAL):** 2026-04-20
- **C.13 - Final Legal Maturity Date:** 2026-04-20
- **Characteristics:** C.9 Eligible Security? Yes, C.14 Has Demand Feature? No, C.15 Has Guarantee? No, C.16 Has Enhancement? No, C.22 Is an Illiquid Security? No, C.20 Is a Daily Liquid Asset? No, C.21 Is a Weekly Liquid Asset? No, C.23 Categorized at Level 3? No

### Security 7: Federal Home Loan Bank

- **C.1 - Title:** Federal Home Loan Bank
- **C.6 - Investment Category:** U.S. Government Agency Debt (if categorized as no-coupon discount notes)
- **Identifiers:** C.3 - CUSIP: 313385QK5, C.4 - ISIN: US313385QK59, C.3 - LEI: 2549001DPIFGXC1TOL40
- **C.18 - Value (incl. sponsor support):** $9586746.62
- **C.18.a - Value (excl. sponsor support):** $9586746.62
- **C.19 - Percentage of Net Assets:** 2.7800%
- **C.17 - Yield as of Reporting Date:** 3.5500%
- **C.11 - Maturity Date (WAM):** 2025-12-12
- **C.12 - Maturity Date (WAL):** 2025-12-12
- **C.13 - Final Legal Maturity Date:** 2025-12-12
- **Characteristics:** C.9 Eligible Security? Yes, C.14 Has Demand Feature? No, C.15 Has Guarantee? No, C.16 Has Enhancement? No, C.22 Is an Illiquid Security? No, C.20 Is a Daily Liquid Asset? No, C.21 Is a Weekly Liquid Asset? Yes, C.23 Categorized at Level 3? No

### Security 8: Federal Home Loan Bank

- **C.1 - Title:** Federal Home Loan Bank
- **C.6 - Investment Category:** U.S. Government Agency Debt (if categorized as no-coupon discount notes)
- **Identifiers:** C.3 - CUSIP: 313385QZ2, C.4 - ISIN: US313385QZ29, C.3 - LEI: 2549001DPIFGXC1TOL40
- **C.18 - Value (incl. sponsor support):** $9772941.12
- **C.18.a - Value (excl. sponsor support):** $9772941.12
- **C.19 - Percentage of Net Assets:** 2.8400%
- **C.17 - Yield as of Reporting Date:** 3.5500%
- **C.11 - Maturity Date (WAM):** 2025-12-26
- **C.12 - Maturity Date (WAL):** 2025-12-26
- **C.13 - Final Legal Maturity Date:** 2025-12-26
- **Characteristics:** C.9 Eligible Security? Yes, C.14 Has Demand Feature? No, C.15 Has Guarantee? No, C.16 Has Enhancement? No, C.22 Is an Illiquid Security? No, C.20 Is a Daily Liquid Asset? No, C.21 Is a Weekly Liquid Asset? Yes, C.23 Categorized at Level 3? No

### Security 9: Federal Home Loan Bank

- **C.1 - Title:** Federal Home Loan Bank
- **C.6 - Investment Category:** U.S. Government Agency Debt (if categorized as no-coupon discount notes)
- **Identifiers:** C.3 - CUSIP: 313385RS7, C.4 - ISIN: US313385RS76, C.3 - LEI: 2549001DPIFGXC1TOL40
- **C.18 - Value (incl. sponsor support):** $18913906.25
- **C.18.a - Value (excl. sponsor support):** $18913906.25
- **C.19 - Percentage of Net Assets:** 5.4900%
- **C.17 - Yield as of Reporting Date:** 3.6300%
- **C.11 - Maturity Date (WAM):** 2026-01-12
- **C.12 - Maturity Date (WAL):** 2026-01-12
- **C.13 - Final Legal Maturity Date:** 2026-01-12
- **Characteristics:** C.9 Eligible Security? Yes, C.14 Has Demand Feature? No, C.15 Has Guarantee? No, C.16 Has Enhancement? No, C.22 Is an Illiquid Security? No, C.20 Is a Daily Liquid Asset? No, C.21 Is a Weekly Liquid Asset? Yes, C.23 Categorized at Level 3? No

### Security 10: Federal Home Loan Bank

- **C.1 - Title:** Federal Home Loan Bank
- **C.6 - Investment Category:** U.S. Government Agency Debt (if categorized as no-coupon discount notes)
- **Identifiers:** C.3 - CUSIP: 313385ST4, C.4 - ISIN: US313385ST41, C.3 - LEI: 2549001DPIFGXC1TOL40
- **C.18 - Value (incl. sponsor support):** $15786072.05
- **C.18.a - Value (excl. sponsor support):** $15786072.05
- **C.19 - Percentage of Net Assets:** 4.5800%
- **C.17 - Yield as of Reporting Date:** 3.6900%
- **C.11 - Maturity Date (WAM):** 2026-02-06
- **C.12 - Maturity Date (WAL):** 2026-02-06
- **C.13 - Final Legal Maturity Date:** 2026-02-06
- **Characteristics:** C.9 Eligible Security? Yes, C.14 Has Demand Feature? No, C.15 Has Guarantee? No, C.16 Has Enhancement? No, C.22 Is an Illiquid Security? No, C.20 Is a Daily Liquid Asset? No, C.21 Is a Weekly Liquid Asset? No, C.23 Categorized at Level 3? No

### Security 11: Federal Home Loan Mortgage Corp.

- **C.1 - Title:** Federal Home Loan Mortgage Corp.
- **C.6 - Investment Category:** U.S. Government Agency Debt (if categorized as no-coupon discount notes)
- **Identifiers:** C.3 - CUSIP: 313397SA0, C.4 - ISIN: US313397SA06, C.3 - LEI: S6XOOCT0IEG5ABCC6L87
- **C.18 - Value (incl. sponsor support):** $9946631.90
- **C.18.a - Value (excl. sponsor support):** $9946631.90
- **C.19 - Percentage of Net Assets:** 2.8900%
- **C.17 - Yield as of Reporting Date:** 3.6300%
- **C.11 - Maturity Date (WAM):** 2026-01-20
- **C.12 - Maturity Date (WAL):** 2026-01-20
- **C.13 - Final Legal Maturity Date:** 2026-01-20
- **Characteristics:** C.9 Eligible Security? Yes, C.14 Has Demand Feature? No, C.15 Has Guarantee? No, C.16 Has Enhancement? No, C.22 Is an Illiquid Security? No, C.20 Is a Daily Liquid Asset? No, C.21 Is a Weekly Liquid Asset? Yes, C.23 Categorized at Level 3? No

### Security 12: Federal Home Loan Mortgage Corp.

- **C.1 - Title:** Federal Home Loan Mortgage Corp.
- **C.6 - Investment Category:** U.S. Government Agency Debt (if categorized as no-coupon discount notes)
- **Identifiers:** C.3 - CUSIP: 313397SG7, C.4 - ISIN: US313397SG75, C.3 - LEI: S6XOOCT0IEG5ABCC6L87
- **C.18 - Value (incl. sponsor support):** $10437619.82
- **C.18.a - Value (excl. sponsor support):** $10437619.82
- **C.19 - Percentage of Net Assets:** 3.0300%
- **C.17 - Yield as of Reporting Date:** 3.6300%
- **C.11 - Maturity Date (WAM):** 2026-01-26
- **C.12 - Maturity Date (WAL):** 2026-01-26
- **C.13 - Final Legal Maturity Date:** 2026-01-26
- **Characteristics:** C.9 Eligible Security? Yes, C.14 Has Demand Feature? No, C.15 Has Guarantee? No, C.16 Has Enhancement? No, C.22 Is an Illiquid Security? No, C.20 Is a Daily Liquid Asset? No, C.21 Is a Weekly Liquid Asset? Yes, C.23 Categorized at Level 3? No

### Security 13: Federal National Mortgage Assoc.

- **C.1 - Title:** Federal National Mortgage Assoc.
- **C.6 - Investment Category:** U.S. Government Agency Debt (if categorized as no-coupon discount notes)
- **Identifiers:** C.3 - CUSIP: 313589PZ0, C.4 - ISIN: US313589PZ08, C.3 - LEI: B1V7KEBTPIMZEU4LTD58
- **C.18 - Value (incl. sponsor support):** $10096016.16
- **C.18.a - Value (excl. sponsor support):** $10096016.16
- **C.19 - Percentage of Net Assets:** 2.9300%
- **C.17 - Yield as of Reporting Date:** 3.5500%
- **C.11 - Maturity Date (WAM):** 2025-12-02
- **C.12 - Maturity Date (WAL):** 2025-12-02
- **C.13 - Final Legal Maturity Date:** 2025-12-02
- **Characteristics:** C.9 Eligible Security? Yes, C.14 Has Demand Feature? No, C.15 Has Guarantee? No, C.16 Has Enhancement? No, C.22 Is an Illiquid Security? No, C.20 Is a Daily Liquid Asset? No, C.21 Is a Weekly Liquid Asset? Yes, C.23 Categorized at Level 3? No

### Security 14: Federal National Mortgage Assoc.

- **C.1 - Title:** Federal National Mortgage Assoc.
- **C.6 - Investment Category:** U.S. Government Agency Debt (if categorized as no-coupon discount notes)
- **Identifiers:** C.3 - CUSIP: 313589QN6, C.4 - ISIN: US313589QN68, C.3 - LEI: B1V7KEBTPIMZEU4LTD58
- **C.18 - Value (incl. sponsor support):** $10083068.46
- **C.18.a - Value (excl. sponsor support):** $10083068.46
- **C.19 - Percentage of Net Assets:** 2.9300%
- **C.17 - Yield as of Reporting Date:** 3.5500%
- **C.11 - Maturity Date (WAM):** 2025-12-15
- **C.12 - Maturity Date (WAL):** 2025-12-15
- **C.13 - Final Legal Maturity Date:** 2025-12-15
- **Characteristics:** C.9 Eligible Security? Yes, C.14 Has Demand Feature? No, C.15 Has Guarantee? No, C.16 Has Enhancement? No, C.22 Is an Illiquid Security? No, C.20 Is a Daily Liquid Asset? No, C.21 Is a Weekly Liquid Asset? Yes, C.23 Categorized at Level 3? No

### Security 15: Fixed Income Clearing Corp. - State Street Bank & Trust Co.

- **C.1 - Title:** Fixed Income Clearing Corp. - State Street Bank & Trust Co. 4.050000%
- **C.6 - Investment Category:** U.S. Treasury Repurchase Agreement, if collateralized only by U.S. Treasuries (including Strips) and cash
- **Identifiers:** C.3 - CUSIP: 85748R009, C.3 - LEI: 549300H47WTHXPU08X20, C.5 - Other ID: 85748R009_4.05_1201
- **C.18 - Value (incl. sponsor support):** $64910152.00
- **C.18.a - Value (excl. sponsor support):** $64910152.00
- **C.19 - Percentage of Net Assets:** 18.8400%
- **C.17 - Yield as of Reporting Date:** 4.0500%
- **C.11 - Maturity Date (WAM):** 2025-12-01
- **C.12 - Maturity Date (WAL):** 2025-12-01
- **C.13 - Final Legal Maturity Date:** 2025-12-01
- **Characteristics:** C.9 Eligible Security? Yes, C.14 Has Demand Feature? No, C.15 Has Guarantee? No, C.16 Has Enhancement? No, C.22 Is an Illiquid Security? No, C.20 Is a Daily Liquid Asset? Yes, C.21 Is a Weekly Liquid Asset? Yes, C.23 Categorized at Level 3? No

**C.8 - Repurchase Agreement Details:**

- **Is Open?:** No

- **Is Cleared?:** Yes

- **Name of CCP:** Fixed Income Clearing Corp.

- **Is Tri-party?:** No

**Collateral:**
| Issuer Name        | Maturity Date   | Coupon   | Yield   | Principal Amount   | Collateral Value   | Category                           |
|:---|:---|:---|:---|:---|:---|:---|
| U.S. Treasury Bond | 2045-02-15      | 4.7500%  | 0.0000% | $64054200.00       | $66208472.78       | U.S. Treasuries (including strips) |

### Security 16: U.S. Treasury Bill

- **C.1 - Title:** U.S. Treasury Bill
- **C.6 - Investment Category:** U.S. Treasury Debt
- **Identifiers:** C.3 - CUSIP: 912797NU7, C.4 - ISIN: US912797NU77, C.3 - LEI: 254900HROIFWPRGM1V77
- **C.18 - Value (incl. sponsor support):** $8377294.30
- **C.18.a - Value (excl. sponsor support):** $8377294.30
- **C.19 - Percentage of Net Assets:** 2.4300%
- **C.17 - Yield as of Reporting Date:** 3.9600%
- **C.11 - Maturity Date (WAM):** 2025-12-26
- **C.12 - Maturity Date (WAL):** 2025-12-26
- **C.13 - Final Legal Maturity Date:** 2025-12-26
- **Characteristics:** C.9 Eligible Security? Yes, C.14 Has Demand Feature? No, C.15 Has Guarantee? No, C.16 Has Enhancement? No, C.22 Is an Illiquid Security? No, C.20 Is a Daily Liquid Asset? Yes, C.21 Is a Weekly Liquid Asset? Yes, C.23 Categorized at Level 3? No

### Security 17: U.S. Treasury Bill

- **C.1 - Title:** U.S. Treasury Bill
- **C.6 - Investment Category:** U.S. Treasury Debt
- **Identifiers:** C.3 - CUSIP: 912797PV3, C.4 - ISIN: US912797PV33, C.3 - LEI: 254900HROIFWPRGM1V77
- **C.18 - Value (incl. sponsor support):** $9394440.75
- **C.18.a - Value (excl. sponsor support):** $9394440.75
- **C.19 - Percentage of Net Assets:** 2.7300%
- **C.17 - Yield as of Reporting Date:** 3.8000%
- **C.11 - Maturity Date (WAM):** 2026-03-19
- **C.12 - Maturity Date (WAL):** 2026-03-19
- **C.13 - Final Legal Maturity Date:** 2026-03-19
- **Characteristics:** C.9 Eligible Security? Yes, C.14 Has Demand Feature? No, C.15 Has Guarantee? No, C.16 Has Enhancement? No, C.22 Is an Illiquid Security? No, C.20 Is a Daily Liquid Asset? Yes, C.21 Is a Weekly Liquid Asset? Yes, C.23 Categorized at Level 3? No

### Security 18: U.S. Treasury Bill

- **C.1 - Title:** U.S. Treasury Bill
- **C.6 - Investment Category:** U.S. Treasury Debt
- **Identifiers:** C.3 - CUSIP: 912797QS9, C.4 - ISIN: US912797QS94, C.3 - LEI: 254900HROIFWPRGM1V77
- **C.18 - Value (incl. sponsor support):** $17994195.00
- **C.18.a - Value (excl. sponsor support):** $17994195.00
- **C.19 - Percentage of Net Assets:** 5.2200%
- **C.17 - Yield as of Reporting Date:** 3.9300%
- **C.11 - Maturity Date (WAM):** 2025-12-04
- **C.12 - Maturity Date (WAL):** 2025-12-04
- **C.13 - Final Legal Maturity Date:** 2025-12-04
- **Characteristics:** C.9 Eligible Security? Yes, C.14 Has Demand Feature? No, C.15 Has Guarantee? No, C.16 Has Enhancement? No, C.22 Is an Illiquid Security? No, C.20 Is a Daily Liquid Asset? Yes, C.21 Is a Weekly Liquid Asset? Yes, C.23 Categorized at Level 3? No

### Security 19: U.S. Treasury Bill

- **C.1 - Title:** U.S. Treasury Bill
- **C.6 - Investment Category:** U.S. Treasury Debt
- **Identifiers:** C.3 - CUSIP: 912797RJ8, C.4 - ISIN: US912797RJ86, C.3 - LEI: 254900HROIFWPRGM1V77
- **C.18 - Value (incl. sponsor support):** $11196645.08
- **C.18.a - Value (excl. sponsor support):** $11196645.08
- **C.19 - Percentage of Net Assets:** 3.2500%
- **C.17 - Yield as of Reporting Date:** 3.8700%
- **C.11 - Maturity Date (WAM):** 2026-01-15
- **C.12 - Maturity Date (WAL):** 2026-01-15
- **C.13 - Final Legal Maturity Date:** 2026-01-15
- **Characteristics:** C.9 Eligible Security? Yes, C.14 Has Demand Feature? No, C.15 Has Guarantee? No, C.16 Has Enhancement? No, C.22 Is an Illiquid Security? No, C.20 Is a Daily Liquid Asset? Yes, C.21 Is a Weekly Liquid Asset? Yes, C.23 Categorized at Level 3? No

### Security 20: U.S. Treasury Bill

- **C.1 - Title:** U.S. Treasury Bill
- **C.6 - Investment Category:** U.S. Treasury Debt
- **Identifiers:** C.3 - CUSIP: 912797RW9, C.4 - ISIN: US912797RW97, C.3 - LEI: 254900HROIFWPRGM1V77
- **C.18 - Value (incl. sponsor support):** $12439237.10
- **C.18.a - Value (excl. sponsor support):** $12439237.10
- **C.19 - Percentage of Net Assets:** 3.6100%
- **C.17 - Yield as of Reporting Date:** 3.9500%
- **C.11 - Maturity Date (WAM):** 2025-12-09
- **C.12 - Maturity Date (WAL):** 2025-12-09
- **C.13 - Final Legal Maturity Date:** 2025-12-09
- **Characteristics:** C.9 Eligible Security? Yes, C.14 Has Demand Feature? No, C.15 Has Guarantee? No, C.16 Has Enhancement? No, C.22 Is an Illiquid Security? No, C.20 Is a Daily Liquid Asset? Yes, C.21 Is a Weekly Liquid Asset? Yes, C.23 Categorized at Level 3? No

### Security 21: U.S. Treasury Bill

- **C.1 - Title:** U.S. Treasury Bill
- **C.6 - Investment Category:** U.S. Treasury Debt
- **Identifiers:** C.3 - CUSIP: 912797SS7, C.4 - ISIN: US912797SS76, C.3 - LEI: 254900HROIFWPRGM1V77
- **C.18 - Value (incl. sponsor support):** $7930363.76
- **C.18.a - Value (excl. sponsor support):** $7930363.76
- **C.19 - Percentage of Net Assets:** 2.3000%
- **C.17 - Yield as of Reporting Date:** 3.7700%
- **C.11 - Maturity Date (WAM):** 2026-02-24
- **C.12 - Maturity Date (WAL):** 2026-02-24
- **C.13 - Final Legal Maturity Date:** 2026-02-24
- **Characteristics:** C.9 Eligible Security? Yes, C.14 Has Demand Feature? No, C.15 Has Guarantee? No, C.16 Has Enhancement? No, C.22 Is an Illiquid Security? No, C.20 Is a Daily Liquid Asset? Yes, C.21 Is a Weekly Liquid Asset? Yes, C.23 Categorized at Level 3? No

### Security 22: U.S. Treasury Bill

- **C.1 - Title:** U.S. Treasury Bill
- **C.6 - Investment Category:** U.S. Treasury Debt
- **Identifiers:** C.3 - CUSIP: 912797SY4, C.4 - ISIN: US912797SY45, C.3 - LEI: 254900HROIFWPRGM1V77
- **C.18 - Value (incl. sponsor support):** $15144166.75
- **C.18.a - Value (excl. sponsor support):** $15144166.75
- **C.19 - Percentage of Net Assets:** 4.4000%
- **C.17 - Yield as of Reporting Date:** 3.7900%
- **C.11 - Maturity Date (WAM):** 2026-03-10
- **C.12 - Maturity Date (WAL):** 2026-03-10
- **C.13 - Final Legal Maturity Date:** 2026-03-10
- **Characteristics:** C.9 Eligible Security? Yes, C.14 Has Demand Feature? No, C.15 Has Guarantee? No, C.16 Has Enhancement? No, C.22 Is an Illiquid Security? No, C.20 Is a Daily Liquid Asset? Yes, C.21 Is a Weekly Liquid Asset? Yes, C.23 Categorized at Level 3? No

## N-MFP: Signatures

**Registrant:** MFS SERIES TRUST IV

**Date:** 2025-12-05

**By:** James Byrne

**Name of Signing Officer:** James Byrne

**Title of Signing Officer:** Assistant Treasurer