# EDGAR Filing Document

**Accession Number:** 0000063068
**File Stem:** 0001145549-25-038728
**Filing Date:** 2025-6
**Character Count:** 35582
**Document Hash:** 967ef0e6cc440607eda3bbdd321492fb
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001145549-25-038728.hdr.sgml**: 20250606

**ACCESSION NUMBER**: 0001145549-25-038728

**CONFORMED SUBMISSION TYPE**: N-MFP3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20250531

**FILED AS OF DATE**: 20250606

**DATE AS OF CHANGE**: 20250606

**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:** 251028999

**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):** 2025-05-31

**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:** 31 days

- **WAL:** 31 days

- **Total Value of Portfolio Securities:** $381003678.29

- **Amortized Cost of Portfolio Securities:** $381043798.81

- **Cash:** $2.18

- **Total Other Assets:** $77209.09

- **Total Liabilities:** $1488857.75

- **Net Assets of Series:** $379632152.33

- **Number of Shares Outstanding (Series):** 379635355.6660

- **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 (%)   |
|:---|:---|:---|:---|:---|
| 2025-05-01 | $197954451.59             | $314880391.79              | 51.2300%                  | 81.5000%                   |
| 2025-05-02 | $206264907.37             | $314658835.93              | 53.4000%                  | 81.4700%                   |
| 2025-05-05 | $204656850.56             | $311834306.38              | 53.0100%                  | 80.7700%                   |
| 2025-05-06 | $205067108.08             | $312257250.14              | 53.0600%                  | 80.7900%                   |
| 2025-05-07 | $204698657.93             | $311898776.28              | 53.0100%                  | 80.7700%                   |
| 2025-05-08 | $211978591.41             | $320727908.08              | 54.9900%                  | 83.2100%                   |
| 2025-05-09 | $200881350.95             | $309643600.96              | 52.1300%                  | 80.3600%                   |
| 2025-05-12 | $201252166.01             | $320479261.26              | 52.1800%                  | 83.0900%                   |
| 2025-05-13 | $200900942.13             | $320142171.91              | 52.1300%                  | 83.0700%                   |
| 2025-05-14 | $200691738.76             | $319947908.57              | 52.1000%                  | 83.0600%                   |
| 2025-05-15 | $209638496.76             | $318409608.44              | 54.6400%                  | 82.9900%                   |
| 2025-05-16 | $221068216.51             | $317952680.42              | 57.6800%                  | 82.9600%                   |
| 2025-05-19 | $209861418.37             | $306782657.68              | 54.7400%                  | 80.0200%                   |
| 2025-05-20 | $207849264.02             | $306572464.70              | 54.2400%                  | 80.0000%                   |
| 2025-05-21 | $207497203.16             | $306232700.35              | 54.2000%                  | 79.9800%                   |
| 2025-05-22 | $193260083.87             | $292007346.77              | 50.6000%                  | 76.4600%                   |
| 2025-05-23 | $192534512.44             | $302365249.66              | 50.4900%                  | 79.3000%                   |
| 2025-05-27 | $192748867.98             | $310326874.96              | 50.5200%                  | 81.3400%                   |
| 2025-05-28 | $192721159.01             | $310313804.60              | 50.5200%                  | 81.3400%                   |
| 2025-05-29 | $203011209.45             | $323272751.59              | 53.2500%                  | 84.8000%                   |
| 2025-05-30 | $192751955.95             | $313031311.71              | 50.5800%                  | 82.1300%                   |

### 7-Day Gross Yield
| Date       | 7-Day Gross Yield   |
|:---|:---|
| 2025-05-01 | 4.3200%             |
| 2025-05-02 | 4.3200%             |
| 2025-05-05 | 4.3200%             |
| 2025-05-06 | 4.3100%             |
| 2025-05-07 | 4.3100%             |
| 2025-05-08 | 4.3100%             |
| 2025-05-09 | 4.3000%             |
| 2025-05-12 | 4.3000%             |
| 2025-05-13 | 4.3000%             |
| 2025-05-14 | 4.3000%             |
| 2025-05-15 | 4.3000%             |
| 2025-05-16 | 4.3000%             |
| 2025-05-19 | 4.3100%             |
| 2025-05-20 | 4.3100%             |
| 2025-05-21 | 4.3100%             |
| 2025-05-22 | 4.3000%             |
| 2025-05-23 | 4.3000%             |
| 2025-05-27 | 4.3000%             |
| 2025-05-28 | 4.3100%             |
| 2025-05-29 | 4.3100%             |
| 2025-05-30 | 4.3200%             |

### Daily Net Asset Value per Share (Series)
| Date       | Net Asset Value per Share   |
|:---|:---|
| 2025-05-01 | 1.0000                      |
|  |  |
| 2025-05-02 | 0.9998                      |
|  |  |
| 2025-05-05 | 0.9999                      |
|  |  |
| 2025-05-06 | 0.9999                      |
|  |  |
| 2025-05-07 | 0.9999                      |
|  |  |
| 2025-05-08 | 0.9999                      |
|  |  |
| 2025-05-09 | 0.9998                      |
|  |  |
| 2025-05-12 | 0.9999                      |
|  |  |
| 2025-05-13 | 0.9999                      |
|  |  |
| 2025-05-14 | 0.9999                      |
|  |  |
| 2025-05-15 | 0.9999                      |
|  |  |
| 2025-05-16 | 0.9998                      |
|  |  |
| 2025-05-19 | 0.9999                      |
|  |  |
| 2025-05-20 | 0.9999                      |
|  |  |
| 2025-05-21 | 0.9999                      |
|  |  |
| 2025-05-22 | 0.9999                      |
|  |  |
| 2025-05-23 | 0.9998                      |
|  |  |
| 2025-05-27 | 0.9999                      |
|  |  |
| 2025-05-28 | 0.9999                      |
|  |  |
| 2025-05-29 | 0.9999                      |
|  |  |
| 2025-05-30 | 0.9999                      |
|  |  |

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

### Class: A

- **Minimum Initial Investment:** $1000.00

- **Net Assets of Class:** $379632152.33

- **Number of Shares Outstanding:** 379635355.6660

- **Expense Reimbursement/Waiver:** 49534.00

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2025-05-01 | 1.0000          |
|  |  |
| 2025-05-02 | 0.9998          |
|  |  |
| 2025-05-05 | 0.9999          |
|  |  |
| 2025-05-06 | 0.9999          |
|  |  |
| 2025-05-07 | 0.9999          |
|  |  |
| 2025-05-08 | 0.9999          |
|  |  |
| 2025-05-09 | 0.9998          |
|  |  |
| 2025-05-12 | 0.9999          |
|  |  |
| 2025-05-13 | 0.9999          |
|  |  |
| 2025-05-14 | 0.9999          |
|  |  |
| 2025-05-15 | 0.9999          |
|  |  |
| 2025-05-16 | 0.9998          |
|  |  |
| 2025-05-19 | 0.9999          |
|  |  |
| 2025-05-20 | 0.9999          |
|  |  |
| 2025-05-21 | 0.9999          |
|  |  |
| 2025-05-22 | 0.9999          |
|  |  |
| 2025-05-23 | 0.9998          |
|  |  |
| 2025-05-27 | 0.9999          |
|  |  |
| 2025-05-28 | 0.9999          |
|  |  |
| 2025-05-29 | 0.9999          |
|  |  |
| 2025-05-30 | 0.9999          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2025-05-01 | $1763798.43               | $579931.90              |
| 2025-05-02 | $399077.40                | $597639.40              |
| 2025-05-05 | $121239.16                | $327749.62              |
| 2025-05-06 | $676051.78                | $299022.74              |
| 2025-05-07 | $117413.78                | $826836.80              |
| 2025-05-08 | $30711.43                 | $455464.64              |
| 2025-05-09 | $10841.43                 | $280789.36              |
| 2025-05-12 | $1092956.92               | $774077.22              |
| 2025-05-13 | $302577.66                | $678364.19              |
| 2025-05-14 | $2085.09                  | $212196.46              |
| 2025-05-15 | $74842.56                 | $1639028.50             |
| 2025-05-16 | $74533.97                 | $631378.47              |
| 2025-05-19 | $653455.89                | $762392.95              |
| 2025-05-20 | $265406.74                | $325802.42              |
| 2025-05-21 | $64740.94                 | $399992.43              |
| 2025-05-22 | $30843.88                 | $1025539.06             |
| 2025-05-23 | $228318.61                | $1029461.67             |
| 2025-05-27 | $580729.45                | $428103.18              |
| 2025-05-28 | $484572.09                | $534817.73              |
| 2025-05-29 | $191929.26                | $372524.97              |
| 2025-05-30 | $346613.40                | $645542.29              |

**Total Gross Subscriptions (Month):** $7512739.87

**Total Gross Redemptions (Month):** $12826656.00

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2025-05-01 | 3.8800%           |
| 2025-05-02 | 3.8700%           |
| 2025-05-05 | 3.8700%           |
| 2025-05-06 | 3.8700%           |
| 2025-05-07 | 3.8600%           |
| 2025-05-08 | 3.8600%           |
| 2025-05-09 | 3.8500%           |
| 2025-05-12 | 3.8500%           |
| 2025-05-13 | 3.8500%           |
| 2025-05-14 | 3.8500%           |
| 2025-05-15 | 3.8500%           |
| 2025-05-16 | 3.8600%           |
| 2025-05-19 | 3.8600%           |
| 2025-05-20 | 3.8600%           |
| 2025-05-21 | 3.8600%           |
| 2025-05-22 | 3.8600%           |
| 2025-05-23 | 3.8500%           |
| 2025-05-27 | 3.8600%           |
| 2025-05-28 | 3.8600%           |
| 2025-05-29 | 3.8600%           |
| 2025-05-30 | 3.8700%           |

**Beneficial/Record Owner Categories**
| Category      | Other Category   | Record Owner %   | Beneficial Owner %   |
|:---|:---|:---|:---|
| Broker-dealer |  | 38.1700%         | 0.0000%              |

## Part C: Schedule of Portfolio Securities

### Security 1: Bank of America NA

- **C.1 - Title:** Bank of America NA 4.340000%
- **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_4.34_0602
- **C.18 - Value (incl. sponsor support):** $59879000.00
- **C.18.a - Value (excl. sponsor support):** $59879000.00
- **C.19 - Percentage of Net Assets:** 15.7700%
- **C.17 - Yield as of Reporting Date:** 4.3400%
- **C.11 - Maturity Date (WAM):** 2025-06-02
- **C.12 - Maturity Date (WAL):** 2025-06-02
- **C.13 - Final Legal Maturity Date:** 2025-06-02
- **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? 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 Note | 2029-09-30      | 3.8750%  | 0.0000% | $62372000.00       | $61222016.25       | 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: 313313GL6, C.4 - ISIN: US313313GL65, C.3 - LEI: 254900C5LP6DN9OP9V83
- **C.18 - Value (incl. sponsor support):** $8395094.15
- **C.18.a - Value (excl. sponsor support):** $8395094.15
- **C.19 - Percentage of Net Assets:** 2.2100%
- **C.17 - Yield as of Reporting Date:** 4.2100%
- **C.11 - Maturity Date (WAM):** 2025-06-04
- **C.12 - Maturity Date (WAL):** 2025-06-04
- **C.13 - Final Legal Maturity Date:** 2025-06-04
- **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? 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: 313313HA9, C.4 - ISIN: US313313HA91, C.3 - LEI: 254900C5LP6DN9OP9V83
- **C.18 - Value (incl. sponsor support):** $10975587.59
- **C.18.a - Value (excl. sponsor support):** $10975587.59
- **C.19 - Percentage of Net Assets:** 2.8900%
- **C.17 - Yield as of Reporting Date:** 4.2100%
- **C.11 - Maturity Date (WAM):** 2025-06-18
- **C.12 - Maturity Date (WAL):** 2025-06-18
- **C.13 - Final Legal Maturity Date:** 2025-06-18
- **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: 313313JE9, C.4 - ISIN: US313313JE95, C.3 - LEI: 254900C5LP6DN9OP9V83
- **C.18 - Value (incl. sponsor support):** $9000493.97
- **C.18.a - Value (excl. sponsor support):** $9000493.97
- **C.19 - Percentage of Net Assets:** 2.3700%
- **C.17 - Yield as of Reporting Date:** 4.1900%
- **C.11 - Maturity Date (WAM):** 2025-07-16
- **C.12 - Maturity Date (WAL):** 2025-07-16
- **C.13 - Final Legal Maturity Date:** 2025-07-16
- **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: 313313JW9, C.4 - ISIN: US313313JW93, C.3 - LEI: 254900C5LP6DN9OP9V83
- **C.18 - Value (incl. sponsor support):** $8635598.25
- **C.18.a - Value (excl. sponsor support):** $8635598.25
- **C.19 - Percentage of Net Assets:** 2.2700%
- **C.17 - Yield as of Reporting Date:** 4.2300%
- **C.11 - Maturity Date (WAM):** 2025-08-01
- **C.12 - Maturity Date (WAL):** 2025-08-01
- **C.13 - Final Legal Maturity Date:** 2025-08-01
- **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? 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: 313313KC1, C.4 - ISIN: US313313KC11, C.3 - LEI: 254900C5LP6DN9OP9V83
- **C.18 - Value (incl. sponsor support):** $10117303.50
- **C.18.a - Value (excl. sponsor support):** $10117303.50
- **C.19 - Percentage of Net Assets:** 2.6700%
- **C.17 - Yield as of Reporting Date:** 4.2300%
- **C.11 - Maturity Date (WAM):** 2025-08-07
- **C.12 - Maturity Date (WAL):** 2025-08-07
- **C.13 - Final Legal Maturity Date:** 2025-08-07
- **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: 313385GT7, C.4 - ISIN: US313385GT78, C.3 - LEI: 2549001DPIFGXC1TOL40
- **C.18 - Value (incl. sponsor support):** $10035913.22
- **C.18.a - Value (excl. sponsor support):** $10035913.22
- **C.19 - Percentage of Net Assets:** 2.6400%
- **C.17 - Yield as of Reporting Date:** 4.2100%
- **C.11 - Maturity Date (WAM):** 2025-06-11
- **C.12 - Maturity Date (WAL):** 2025-06-11
- **C.13 - Final Legal Maturity Date:** 2025-06-11
- **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: 313385GV2, C.4 - ISIN: US313385GV25, C.3 - LEI: 2549001DPIFGXC1TOL40
- **C.18 - Value (incl. sponsor support):** $10982011.92
- **C.18.a - Value (excl. sponsor support):** $10982011.92
- **C.19 - Percentage of Net Assets:** 2.8900%
- **C.17 - Yield as of Reporting Date:** 4.2100%
- **C.11 - Maturity Date (WAM):** 2025-06-13
- **C.12 - Maturity Date (WAL):** 2025-06-13
- **C.13 - Final Legal Maturity Date:** 2025-06-13
- **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: 313385HC3, C.4 - ISIN: US313385HC35, C.3 - LEI: 2549001DPIFGXC1TOL40
- **C.18 - Value (incl. sponsor support):** $10474244.34
- **C.18.a - Value (excl. sponsor support):** $10474244.34
- **C.19 - Percentage of Net Assets:** 2.7600%
- **C.17 - Yield as of Reporting Date:** 4.2100%
- **C.11 - Maturity Date (WAM):** 2025-06-20
- **C.12 - Maturity Date (WAL):** 2025-06-20
- **C.13 - Final Legal Maturity Date:** 2025-06-20
- **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 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: 313385HQ2, C.4 - ISIN: US313385HQ21, C.3 - LEI: 2549001DPIFGXC1TOL40
- **C.18 - Value (incl. sponsor support):** $8367737.03
- **C.18.a - Value (excl. sponsor support):** $8367737.03
- **C.19 - Percentage of Net Assets:** 2.2000%
- **C.17 - Yield as of Reporting Date:** 4.1900%
- **C.11 - Maturity Date (WAM):** 2025-07-02
- **C.12 - Maturity Date (WAL):** 2025-07-02
- **C.13 - Final Legal Maturity Date:** 2025-07-02
- **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 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: 313385HV1, C.4 - ISIN: US313385HV16, C.3 - LEI: 2549001DPIFGXC1TOL40
- **C.18 - Value (incl. sponsor support):** $9557541.31
- **C.18.a - Value (excl. sponsor support):** $9557541.31
- **C.19 - Percentage of Net Assets:** 2.5200%
- **C.17 - Yield as of Reporting Date:** 4.1900%
- **C.11 - Maturity Date (WAM):** 2025-07-07
- **C.12 - Maturity Date (WAL):** 2025-07-07
- **C.13 - Final Legal Maturity Date:** 2025-07-07
- **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 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: 313385HY5, C.4 - ISIN: US313385HY54, C.3 - LEI: 2549001DPIFGXC1TOL40
- **C.18 - Value (incl. sponsor support):** $10449894.63
- **C.18.a - Value (excl. sponsor support):** $10449894.63
- **C.19 - Percentage of Net Assets:** 2.7500%
- **C.17 - Yield as of Reporting Date:** 4.1900%
- **C.11 - Maturity Date (WAM):** 2025-07-10
- **C.12 - Maturity Date (WAL):** 2025-07-10
- **C.13 - Final Legal Maturity Date:** 2025-07-10
- **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? No, C.21 Is a Weekly Liquid Asset? Yes, C.23 Categorized at Level 3? No

### Security 13: Federal Home Loan 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: 313385JM9, C.4 - ISIN: US313385JM98, C.3 - LEI: 2549001DPIFGXC1TOL40
- **C.18 - Value (incl. sponsor support):** $7701291.25
- **C.18.a - Value (excl. sponsor support):** $7701291.25
- **C.19 - Percentage of Net Assets:** 2.0300%
- **C.17 - Yield as of Reporting Date:** 4.1900%
- **C.11 - Maturity Date (WAM):** 2025-07-23
- **C.12 - Maturity Date (WAL):** 2025-07-23
- **C.13 - Final Legal Maturity Date:** 2025-07-23
- **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 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: 313385KD7, C.4 - ISIN: US313385KD70, C.3 - LEI: 2549001DPIFGXC1TOL40
- **C.18 - Value (incl. sponsor support):** $10909525.00
- **C.18.a - Value (excl. sponsor support):** $10909525.00
- **C.19 - Percentage of Net Assets:** 2.8700%
- **C.17 - Yield as of Reporting Date:** 4.2300%
- **C.11 - Maturity Date (WAM):** 2025-08-08
- **C.12 - Maturity Date (WAL):** 2025-08-08
- **C.13 - Final Legal Maturity Date:** 2025-08-08
- **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 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: 313385KY1, C.4 - ISIN: US313385KY18, C.3 - LEI: 2549001DPIFGXC1TOL40
- **C.18 - Value (incl. sponsor support):** $9944902.13
- **C.18.a - Value (excl. sponsor support):** $9944902.13
- **C.19 - Percentage of Net Assets:** 2.6200%
- **C.17 - Yield as of Reporting Date:** 4.2300%
- **C.11 - Maturity Date (WAM):** 2025-08-27
- **C.12 - Maturity Date (WAL):** 2025-08-27
- **C.13 - Final Legal Maturity Date:** 2025-08-27
- **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 16: 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: 313385LM6, C.4 - ISIN: US313385LM60, C.3 - LEI: 2549001DPIFGXC1TOL40
- **C.18 - Value (incl. sponsor support):** $10968381.75
- **C.18.a - Value (excl. sponsor support):** $10968381.75
- **C.19 - Percentage of Net Assets:** 2.8900%
- **C.17 - Yield as of Reporting Date:** 4.1900%
- **C.11 - Maturity Date (WAM):** 2025-09-09
- **C.12 - Maturity Date (WAL):** 2025-09-09
- **C.13 - Final Legal Maturity Date:** 2025-09-09
- **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? No, C.21 Is a Weekly Liquid Asset? No, C.23 Categorized at Level 3? No

### Security 17: 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: 313385MC7, C.4 - ISIN: US313385MC79, C.3 - LEI: 2549001DPIFGXC1TOL40
- **C.18 - Value (incl. sponsor support):** $6017032.38
- **C.18.a - Value (excl. sponsor support):** $6017032.38
- **C.19 - Percentage of Net Assets:** 1.5800%
- **C.17 - Yield as of Reporting Date:** 4.1900%
- **C.11 - Maturity Date (WAM):** 2025-09-24
- **C.12 - Maturity Date (WAL):** 2025-09-24
- **C.13 - Final Legal Maturity Date:** 2025-09-24
- **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? No, C.23 Categorized at Level 3? No

### Security 18: 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):** $11379625.75
- **C.18.a - Value (excl. sponsor support):** $11379625.75
- **C.19 - Percentage of Net Assets:** 3.0000%
- **C.17 - Yield as of Reporting Date:** 4.1200%
- **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? No, C.23 Categorized at Level 3? No

### Security 19: 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: 313397JL6, C.4 - ISIN: US313397JL61, C.3 - LEI: S6XOOCT0IEG5ABCC6L87
- **C.18 - Value (incl. sponsor support):** $11081220.00
- **C.18.a - Value (excl. sponsor support):** $11081220.00
- **C.19 - Percentage of Net Assets:** 2.9200%
- **C.17 - Yield as of Reporting Date:** 4.1900%
- **C.11 - Maturity Date (WAM):** 2025-07-22
- **C.12 - Maturity Date (WAL):** 2025-07-22
- **C.13 - Final Legal Maturity Date:** 2025-07-22
- **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 20: 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: 313397JS1, C.4 - ISIN: US313397JS15, C.3 - LEI: S6XOOCT0IEG5ABCC6L87
- **C.18 - Value (incl. sponsor support):** $13258326.35
- **C.18.a - Value (excl. sponsor support):** $13258326.35
- **C.19 - Percentage of Net Assets:** 3.4900%
- **C.17 - Yield as of Reporting Date:** 4.1900%
- **C.11 - Maturity Date (WAM):** 2025-07-28
- **C.12 - Maturity Date (WAL):** 2025-07-28
- **C.13 - Final Legal Maturity Date:** 2025-07-28
- **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 21: Fixed Income Clearing Corp. - State Street Bank & Trust Co.

- **C.1 - Title:** Fixed Income Clearing Corp. - State Street Bank & Trust Co. 4.310000%
- **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_4.31_0602
- **C.18 - Value (incl. sponsor support):** $59878324.00
- **C.18.a - Value (excl. sponsor support):** $59878324.00
- **C.19 - Percentage of Net Assets:** 15.7700%
- **C.17 - Yield as of Reporting Date:** 4.3100%
- **C.11 - Maturity Date (WAM):** 2025-06-02
- **C.12 - Maturity Date (WAL):** 2025-06-02
- **C.13 - Final Legal Maturity Date:** 2025-06-02
- **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? 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 Inflation Indexed Bonds | 2027-05-15      | 1.7500%  | 0.0000% | $39468000.00       | $61075981.29       | U.S. Treasuries (including strips) |

### 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: 912797LN5, C.4 - ISIN: US912797LN52, C.3 - LEI: 254900HROIFWPRGM1V77
- **C.18 - Value (incl. sponsor support):** $25769639.08
- **C.18.a - Value (excl. sponsor support):** $25769639.08
- **C.19 - Percentage of Net Assets:** 6.7900%
- **C.17 - Yield as of Reporting Date:** 4.3000%
- **C.11 - Maturity Date (WAM):** 2025-06-12
- **C.12 - Maturity Date (WAL):** 2025-06-12
- **C.13 - Final Legal Maturity Date:** 2025-06-12
- **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 23: U.S. Treasury Bill

- **C.1 - Title:** U.S. Treasury Bill
- **C.6 - Investment Category:** U.S. Treasury Debt
- **Identifiers:** C.3 - CUSIP: 912797PL5, C.4 - ISIN: US912797PL50, C.3 - LEI: 254900HROIFWPRGM1V77
- **C.18 - Value (incl. sponsor support):** $23447243.69
- **C.18.a - Value (excl. sponsor support):** $23447243.69
- **C.19 - Percentage of Net Assets:** 6.1800%
- **C.17 - Yield as of Reporting Date:** 4.2900%
- **C.11 - Maturity Date (WAM):** 2025-06-03
- **C.12 - Maturity Date (WAL):** 2025-06-03
- **C.13 - Final Legal Maturity Date:** 2025-06-03
- **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 24: U.S. Treasury Bill

- **C.1 - Title:** U.S. Treasury Bill
- **C.6 - Investment Category:** U.S. Treasury Debt
- **Identifiers:** C.3 - CUSIP: 912797PR2, C.4 - ISIN: US912797PR21, C.3 - LEI: 254900HROIFWPRGM1V77
- **C.18 - Value (incl. sponsor support):** $23777747.00
- **C.18.a - Value (excl. sponsor support):** $23777747.00
- **C.19 - Percentage of Net Assets:** 6.2600%
- **C.17 - Yield as of Reporting Date:** 4.2700%
- **C.11 - Maturity Date (WAM):** 2025-06-10
- **C.12 - Maturity Date (WAL):** 2025-06-10
- **C.13 - Final Legal Maturity Date:** 2025-06-10
- **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:** 2025-06-06

**By:** James Byrne

**Name of Signing Officer:** James Byrne

**Title of Signing Officer:** Assistant Treasurer