# EDGAR Filing Document

**Accession Number:** 0000063068
**File Stem:** 0001410368-25-021412
**Filing Date:** 2025-11
**Character Count:** 35212
**Document Hash:** 5b176b802a4b127da41302b8434328e9
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001410368-25-021412.hdr.sgml**: 20251107

**ACCESSION NUMBER**: 0001410368-25-021412

**CONFORMED SUBMISSION TYPE**: N-MFP3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20251031

**FILED AS OF DATE**: 20251107

**DATE AS OF CHANGE**: 20251107

**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:** 251460485

**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):** 2025-10-31

**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:** 36 days

- **WAL:** 36 days

- **Total Value of Portfolio Securities:** $345095092.59

- **Amortized Cost of Portfolio Securities:** $345072600.12

- **Cash:** $1.38

- **Total Other Assets:** $59115.87

- **Total Liabilities:** $1166763.20

- **Net Assets of Series:** $343964954.17

- **Number of Shares Outstanding (Series):** 343965445.6290

- **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 (%)   |
|:---|:---|:---|:---|:---|
| 2025-10-01 | $201645167.43             | $287485969.32              | 57.7200%                  | 82.2900%                   |
| 2025-10-02 | $193890893.20             | $279735883.74              | 55.6300%                  | 80.2600%                   |
| 2025-10-03 | $208672408.67             | $289466426.31              | 59.9100%                  | 83.1100%                   |
| 2025-10-06 | $207880614.92             | $298042242.05              | 59.8200%                  | 85.7700%                   |
| 2025-10-07 | $206978885.05             | $297146807.80              | 59.7000%                  | 85.7100%                   |
| 2025-10-08 | $206060495.49             | $296241030.68              | 59.6000%                  | 85.6900%                   |
| 2025-10-09 | $199104041.67             | $297251093.80              | 57.4200%                  | 85.7300%                   |
| 2025-10-10 | $198331465.79             | $296491645.22              | 57.3200%                  | 85.6900%                   |
| 2025-10-13 | $198331756.61             | $306063132.16              | 57.2800%                  | 88.4000%                   |
| 2025-10-14 | $198287999.14             | $306030980.45              | 57.3100%                  | 88.4400%                   |
| 2025-10-15 | $199972481.65             | $307729498.84              | 57.5100%                  | 88.5000%                   |
| 2025-10-16 | $199847891.75             | $307619059.26              | 57.4900%                  | 88.4900%                   |
| 2025-10-17 | $217696430.37             | $299233863.84              | 62.6200%                  | 86.0800%                   |
| 2025-10-20 | $217529309.99             | $299090906.44              | 62.6100%                  | 86.0800%                   |
| 2025-10-21 | $207508590.56             | $289080609.83              | 59.7400%                  | 83.2200%                   |
| 2025-10-22 | $207396868.24             | $288978319.97              | 59.7200%                  | 83.2100%                   |
| 2025-10-23 | $220384719.92             | $288276007.62              | 63.5900%                  | 83.1800%                   |
| 2025-10-24 | $220369016.53             | $288268613.92              | 63.5800%                  | 83.1700%                   |
| 2025-10-27 | $220664099.97             | $305281019.86              | 63.6100%                  | 88.0000%                   |
| 2025-10-28 | $210229071.60             | $294857009.85              | 60.6000%                  | 85.0000%                   |
| 2025-10-29 | $210155642.61             | $294795173.66              | 60.5800%                  | 84.9700%                   |
| 2025-10-30 | $218501480.17             | $293147990.74              | 63.3000%                  | 84.9200%                   |
| 2025-10-31 | $220521170.29             | $285776932.78              | 63.8900%                  | 82.8000%                   |

### 7-Day Gross Yield
| Date       | 7-Day Gross Yield   |
|:---|:---|
| 2025-10-01 | 4.1900%             |
| 2025-10-02 | 4.1900%             |
| 2025-10-03 | 4.1800%             |
| 2025-10-06 | 4.1700%             |
| 2025-10-07 | 4.1600%             |
| 2025-10-08 | 4.1600%             |
| 2025-10-09 | 4.1500%             |
| 2025-10-10 | 4.1400%             |
| 2025-10-13 | 4.1400%             |
| 2025-10-14 | 4.1400%             |
| 2025-10-15 | 4.1400%             |
| 2025-10-16 | 4.1500%             |
| 2025-10-17 | 4.1500%             |
| 2025-10-20 | 4.1400%             |
| 2025-10-21 | 4.1400%             |
| 2025-10-22 | 4.1300%             |
| 2025-10-23 | 4.1300%             |
| 2025-10-24 | 4.1200%             |
| 2025-10-27 | 4.1300%             |
| 2025-10-28 | 4.1300%             |
| 2025-10-29 | 4.1300%             |
| 2025-10-30 | 4.1100%             |
| 2025-10-31 | 4.1100%             |

### Daily Net Asset Value per Share (Series)
| Date       | Net Asset Value per Share   |
|:---|:---|
| 2025-10-01 | 1.0001                      |
|  |  |
| 2025-10-02 | 1.0001                      |
|  |  |
| 2025-10-03 | 1.0000                      |
|  |  |
| 2025-10-06 | 1.0000                      |
|  |  |
| 2025-10-07 | 1.0000                      |
|  |  |
| 2025-10-08 | 1.0000                      |
|  |  |
| 2025-10-09 | 1.0000                      |
|  |  |
| 2025-10-10 | 1.0000                      |
|  |  |
| 2025-10-13 | 1.0000                      |
|  |  |
| 2025-10-14 | 1.0000                      |
|  |  |
| 2025-10-15 | 1.0000                      |
|  |  |
| 2025-10-16 | 1.0001                      |
|  |  |
| 2025-10-17 | 0.9999                      |
|  |  |
| 2025-10-20 | 1.0000                      |
|  |  |
| 2025-10-21 | 1.0000                      |
|  |  |
| 2025-10-22 | 1.0000                      |
|  |  |
| 2025-10-23 | 1.0000                      |
|  |  |
| 2025-10-24 | 1.0000                      |
|  |  |
| 2025-10-27 | 1.0001                      |
|  |  |
| 2025-10-28 | 1.0001                      |
|  |  |
| 2025-10-29 | 1.0001                      |
|  |  |
| 2025-10-30 | 1.0000                      |
|  |  |
| 2025-10-31 | 1.0001                      |
|  |  |

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

### Class: A

- **Minimum Initial Investment:** $1000.00

- **Net Assets of Class:** $343964954.17

- **Number of Shares Outstanding:** 343965445.6290

- **Expense Reimbursement/Waiver:** 46069.00

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2025-10-01 | 1.0001          |
|  |  |
| 2025-10-02 | 1.0001          |
|  |  |
| 2025-10-03 | 1.0000          |
|  |  |
| 2025-10-06 | 1.0000          |
|  |  |
| 2025-10-07 | 1.0000          |
|  |  |
| 2025-10-08 | 1.0000          |
|  |  |
| 2025-10-09 | 1.0000          |
|  |  |
| 2025-10-10 | 1.0000          |
|  |  |
| 2025-10-13 | 1.0000          |
|  |  |
| 2025-10-14 | 1.0000          |
|  |  |
| 2025-10-15 | 1.0000          |
|  |  |
| 2025-10-16 | 1.0001          |
|  |  |
| 2025-10-17 | 0.9999          |
|  |  |
| 2025-10-20 | 1.0000          |
|  |  |
| 2025-10-21 | 1.0000          |
|  |  |
| 2025-10-22 | 1.0000          |
|  |  |
| 2025-10-23 | 1.0000          |
|  |  |
| 2025-10-24 | 1.0000          |
|  |  |
| 2025-10-27 | 1.0001          |
|  |  |
| 2025-10-28 | 1.0001          |
|  |  |
| 2025-10-29 | 1.0001          |
|  |  |
| 2025-10-30 | 1.0000          |
|  |  |
| 2025-10-31 | 1.0001          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2025-10-01 | $1917304.33               | $1279153.40             |
| 2025-10-02 | $25104.56                 | $677571.40              |
| 2025-10-03 | $80441.80                 | $427699.77              |
| 2025-10-06 | $170927.06                | $1003916.93             |
| 2025-10-07 | $187486.12                | $1022552.82             |
| 2025-10-08 | $44618.53                 | $1079204.01             |
| 2025-10-09 | $1227915.88               | $280388.03              |
| 2025-10-10 | $18251.57                 | $805386.92              |
| 2025-10-13 | $160605.48                | $187382.57              |
| 2025-10-14 | $44547.81                 | $115163.49              |
| 2025-10-15 | $2192059.30               | $559041.78              |
| 2025-10-16 | $300820.83                | $417857.40              |
| 2025-10-17 | $592638.02                | $671885.29              |
| 2025-10-20 | $66169.01                 | $301028.22              |
| 2025-10-21 | $173229.33                | $300430.17              |
| 2025-10-22 | $39850.47                 | $180108.31              |
| 2025-10-23 | $143134.77                | $877423.52              |
| 2025-10-24 | $644876.66                | $707224.23              |
| 2025-10-27 | $521726.49                | $283430.91              |
| 2025-10-28 | $264698.27                | $323141.24              |
| 2025-10-29 | $175675.71                | $186877.42              |
| 2025-10-30 | $271036.46                | $1888184.43             |
| 2025-10-31 | $325537.58                | $413572.15              |

**Total Gross Subscriptions (Month):** $9588656.04

**Total Gross Redemptions (Month):** $13988624.41

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2025-10-01 | 3.7500%           |
| 2025-10-02 | 3.7400%           |
| 2025-10-03 | 3.7300%           |
| 2025-10-06 | 3.7200%           |
| 2025-10-07 | 3.7200%           |
| 2025-10-08 | 3.7100%           |
| 2025-10-09 | 3.7000%           |
| 2025-10-10 | 3.6900%           |
| 2025-10-13 | 3.6900%           |
| 2025-10-14 | 3.6900%           |
| 2025-10-15 | 3.7000%           |
| 2025-10-16 | 3.7000%           |
| 2025-10-17 | 3.7000%           |
| 2025-10-20 | 3.7000%           |
| 2025-10-21 | 3.7000%           |
| 2025-10-22 | 3.6900%           |
| 2025-10-23 | 3.6800%           |
| 2025-10-24 | 3.6800%           |
| 2025-10-27 | 3.6800%           |
| 2025-10-28 | 3.6800%           |
| 2025-10-29 | 3.6800%           |
| 2025-10-30 | 3.6700%           |
| 2025-10-31 | 3.6600%           |

**Beneficial/Record Owner Categories**
| Category      | Other Category   | Record Owner %   | Beneficial Owner %   |
|:---|:---|:---|:---|
| Broker-dealer |  | 36.7200%         | 0.0000%              |
| Broker-dealer |  | 5.1100%          | 0.0000%              |

## Part C: Schedule of Portfolio Securities

### Security 1: Bank of America NA

- **C.1 - Title:** Bank of America NA 4.100000%
- **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_4.10_1103
- **C.18 - Value (incl. sponsor support):** $62572000.00
- **C.18.a - Value (excl. sponsor support):** $62572000.00
- **C.19 - Percentage of Net Assets:** 18.1900%
- **C.17 - Yield as of Reporting Date:** 4.1000%
- **C.11 - Maturity Date (WAM):** 2025-11-03
- **C.12 - Maturity Date (WAL):** 2025-11-03
- **C.13 - Final Legal Maturity Date:** 2025-11-03
- **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? 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 | 2040-11-15      | 4.2500%  | 0.0000% | $64194000.00       | $63993393.75       | 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: 313313PR3, C.4 - ISIN: US313313PR35, C.3 - LEI: 254900C5LP6DN9OP9V83
- **C.18 - Value (incl. sponsor support):** $7979413.36
- **C.18.a - Value (excl. sponsor support):** $7979413.36
- **C.19 - Percentage of Net Assets:** 2.3200%
- **C.17 - Yield as of Reporting Date:** 3.8600%
- **C.11 - Maturity Date (WAM):** 2025-11-24
- **C.12 - Maturity Date (WAL):** 2025-11-24
- **C.13 - Final Legal Maturity Date:** 2025-11-24
- **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? 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: 313313QA9, C.4 - ISIN: US313313QA90, C.3 - LEI: 254900C5LP6DN9OP9V83
- **C.18 - Value (incl. sponsor support):** $9367256.70
- **C.18.a - Value (excl. sponsor support):** $9367256.70
- **C.19 - Percentage of Net Assets:** 2.7200%
- **C.17 - Yield as of Reporting Date:** 3.8000%
- **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 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: 313313QZ4, C.4 - ISIN: US313313QZ42, C.3 - LEI: 254900C5LP6DN9OP9V83
- **C.18 - Value (incl. sponsor support):** $6958622.23
- **C.18.a - Value (excl. sponsor support):** $6958622.23
- **C.19 - Percentage of Net Assets:** 2.0200%
- **C.17 - Yield as of Reporting Date:** 3.8000%
- **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 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: 313313ST6, C.4 - ISIN: US313313ST63, C.3 - LEI: 254900C5LP6DN9OP9V83
- **C.18 - Value (incl. sponsor support):** $7917788.88
- **C.18.a - Value (excl. sponsor support):** $7917788.88
- **C.19 - Percentage of Net Assets:** 2.3000%
- **C.17 - Yield as of Reporting Date:** 3.7800%
- **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 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: 313313TW8, C.4 - ISIN: US313313TW83, C.3 - LEI: 254900C5LP6DN9OP9V83
- **C.18 - Value (incl. sponsor support):** $6415703.13
- **C.18.a - Value (excl. sponsor support):** $6415703.13
- **C.19 - Percentage of Net Assets:** 1.8700%
- **C.17 - Yield as of Reporting Date:** 3.7400%
- **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 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: 313385PD2, C.4 - ISIN: US313385PD26, C.3 - LEI: 2549001DPIFGXC1TOL40
- **C.18 - Value (incl. sponsor support):** $11585074.63
- **C.18.a - Value (excl. sponsor support):** $11585074.63
- **C.19 - Percentage of Net Assets:** 3.3700%
- **C.17 - Yield as of Reporting Date:** 3.8600%
- **C.11 - Maturity Date (WAM):** 2025-11-12
- **C.12 - Maturity Date (WAL):** 2025-11-12
- **C.13 - Final Legal Maturity Date:** 2025-11-12
- **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: 313385QK5, C.4 - ISIN: US313385QK59, C.3 - LEI: 2549001DPIFGXC1TOL40
- **C.18 - Value (incl. sponsor support):** $9557440.03
- **C.18.a - Value (excl. sponsor support):** $9557440.03
- **C.19 - Percentage of Net Assets:** 2.7800%
- **C.17 - Yield as of Reporting Date:** 3.8000%
- **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 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: 313385QZ2, C.4 - ISIN: US313385QZ29, C.3 - LEI: 2549001DPIFGXC1TOL40
- **C.18 - Value (incl. sponsor support):** $9742071.12
- **C.18.a - Value (excl. sponsor support):** $9742071.12
- **C.19 - Percentage of Net Assets:** 2.8300%
- **C.17 - Yield as of Reporting Date:** 3.8000%
- **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 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: 313385RS7, C.4 - ISIN: US313385RS76, C.3 - LEI: 2549001DPIFGXC1TOL40
- **C.18 - Value (incl. sponsor support):** $8930467.53
- **C.18.a - Value (excl. sponsor support):** $8930467.53
- **C.19 - Percentage of Net Assets:** 2.6000%
- **C.17 - Yield as of Reporting Date:** 3.8100%
- **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? No, C.23 Categorized at Level 3? No

### Security 11: 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):** $15736605.40
- **C.18.a - Value (excl. sponsor support):** $15736605.40
- **C.19 - Percentage of Net Assets:** 4.5800%
- **C.17 - Yield as of Reporting Date:** 3.7800%
- **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 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: 313397NU1, C.4 - ISIN: US313397NU15, C.3 - LEI: S6XOOCT0IEG5ABCC6L87
- **C.18 - Value (incl. sponsor support):** $9396976.30
- **C.18.a - Value (excl. sponsor support):** $9396976.30
- **C.19 - Percentage of Net Assets:** 2.7300%
- **C.17 - Yield as of Reporting Date:** 0.0000%
- **C.11 - Maturity Date (WAM):** 2025-11-03
- **C.12 - Maturity Date (WAL):** 2025-11-03
- **C.13 - Final Legal Maturity Date:** 2025-11-03
- **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? Yes, C.21 Is a Weekly Liquid Asset? Yes, C.23 Categorized at Level 3? No

### Security 13: 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):** $9914275.00
- **C.18.a - Value (excl. sponsor support):** $9914275.00
- **C.19 - Percentage of Net Assets:** 2.8800%
- **C.17 - Yield as of Reporting Date:** 3.8100%
- **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? No, C.23 Categorized at Level 3? No

### Security 14: 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):** $10403321.25
- **C.18.a - Value (excl. sponsor support):** $10403321.25
- **C.19 - Percentage of Net Assets:** 3.0200%
- **C.17 - Yield as of Reporting Date:** 3.8100%
- **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? No, C.23 Categorized at Level 3? No

### Security 15: 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):** $10065884.42
- **C.18.a - Value (excl. sponsor support):** $10065884.42
- **C.19 - Percentage of Net Assets:** 2.9300%
- **C.17 - Yield as of Reporting Date:** 3.8000%
- **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 16: Fixed Income Clearing Corp. - State Street Bank & Trust Co.

- **C.1 - Title:** Fixed Income Clearing Corp. - State Street Bank & Trust Co. 4.130000%
- **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_4.13_1103
- **C.18 - Value (incl. sponsor support):** $62572262.00
- **C.18.a - Value (excl. sponsor support):** $62572262.00
- **C.19 - Percentage of Net Assets:** 18.1900%
- **C.17 - Yield as of Reporting Date:** 4.1300%
- **C.11 - Maturity Date (WAM):** 2025-11-03
- **C.12 - Maturity Date (WAL):** 2025-11-03
- **C.13 - Final Legal Maturity Date:** 2025-11-03
- **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? 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 | 2055-08-15      | 4.7500%  | 0.0000% | $62166500.00       | $63823713.42       | U.S. Treasuries (including strips) |

### 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: 912797NU7, C.4 - ISIN: US912797NU77, C.3 - LEI: 254900HROIFWPRGM1V77
- **C.18 - Value (incl. sponsor support):** $8351737.55
- **C.18.a - Value (excl. sponsor support):** $8351737.55
- **C.19 - Percentage of Net Assets:** 2.4300%
- **C.17 - Yield as of Reporting Date:** 3.9800%
- **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 18: 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):** $9366152.41
- **C.18.a - Value (excl. sponsor support):** $9366152.41
- **C.19 - Percentage of Net Assets:** 2.7200%
- **C.17 - Yield as of Reporting Date:** 3.8400%
- **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 19: 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):** $17939972.34
- **C.18.a - Value (excl. sponsor support):** $17939972.34
- **C.19 - Percentage of Net Assets:** 5.2200%
- **C.17 - Yield as of Reporting Date:** 3.9400%
- **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 20: 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):** $11164005.45
- **C.18.a - Value (excl. sponsor support):** $11164005.45
- **C.19 - Percentage of Net Assets:** 3.2500%
- **C.17 - Yield as of Reporting Date:** 3.8500%
- **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 21: U.S. Treasury Bill

- **C.1 - Title:** U.S. Treasury Bill
- **C.6 - Investment Category:** U.S. Treasury Debt
- **Identifiers:** C.3 - CUSIP: 912797RN9, C.4 - ISIN: US912797RN98, C.3 - LEI: 254900HROIFWPRGM1V77
- **C.18 - Value (incl. sponsor support):** $13786752.00
- **C.18.a - Value (excl. sponsor support):** $13786752.00
- **C.19 - Percentage of Net Assets:** 4.0100%
- **C.17 - Yield as of Reporting Date:** 3.9000%
- **C.11 - Maturity Date (WAM):** 2025-11-12
- **C.12 - Maturity Date (WAL):** 2025-11-12
- **C.13 - Final Legal Maturity Date:** 2025-11-12
- **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? 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: 912797RQ2, C.4 - ISIN: US912797RQ20, C.3 - LEI: 254900HROIFWPRGM1V77
- **C.18 - Value (incl. sponsor support):** $12969268.26
- **C.18.a - Value (excl. sponsor support):** $12969268.26
- **C.19 - Percentage of Net Assets:** 3.7700%
- **C.17 - Yield as of Reporting Date:** 3.9300%
- **C.11 - Maturity Date (WAM):** 2025-11-25
- **C.12 - Maturity Date (WAL):** 2025-11-25
- **C.13 - Final Legal Maturity Date:** 2025-11-25
- **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 23: 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):** $12402042.60
- **C.18.a - Value (excl. sponsor support):** $12402042.60
- **C.19 - Percentage of Net Assets:** 3.6100%
- **C.17 - Yield as of Reporting Date:** 3.9200%
- **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

## N-MFP: Signatures

**Registrant:** MFS SERIES TRUST IV

**Date:** 2025-11-07

**By:** James Byrne

**Name of Signing Officer:** James Byrne

**Title of Signing Officer:** Assistant Treasurer