# EDGAR Filing Document

**Accession Number:** 0000063068
**File Stem:** 0001145549-23-005351
**Filing Date:** 2023-2
**Character Count:** 17903
**Document Hash:** 46693874e659a095985429b242a0f7a1
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001145549-23-005351.hdr.sgml**: 20230207

**ACCESSION NUMBER**: 0001145549-23-005351

**CONFORMED SUBMISSION TYPE**: N-MFP2

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20230131

**FILED AS OF DATE**: 20230207

**DATE AS OF CHANGE**: 20230207

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MFS SERIES TRUST IV
- **CENTRAL INDEX KEY:** 0000063068
- **IRS NUMBER:** 046382595
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 1031

**FILING VALUES:**
- **FORM TYPE:** N-MFP2
- **SEC ACT:** 1940 Act
- **SEC FILE NUMBER:** 811-02594
- **FILM NUMBER:** 23593273

**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-MFP: Monthly Schedule of Portfolio Holdings

## N-MFP: Filer Information

**Submission Type:** N-MFP2

**Live/Test Flag:** —

**Is Electronic Copy of Paper Format:** —

**CIK:** —

### General Information

**Report for (YYYY-MM-DD):** 2023-01-31

**EDGAR Series Identifier:** S000002435

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

**Is this the fund's final filing on Form N-MFP?:** —

**Is Fund Liquidating?:** —

**Is Fund Merging/Being Acquired?:** —

**Has the fund acquired or merged with another fund during the reporting period?:** —

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

### Service Providers
| Item   | Role                          | Details                                            | File/CIK Number   |
|:---|:---|:---|:---|
| A.5    | Administrator                 | Massachusetts Financial Services Company           |  |
| A.4    | Independent Public Accountant | Deloitte & Touche LLP<br>City: Boston<br>State: MA |  |
| A.6    | Transfer Agent                | MFS Service Center, Inc<br>CIK: 0000769188         | 084-01316         |

### Fund Characteristics & Assets

- **A.1 - Securities Act File Number:** 002-54607

- **A.7 - Is this a Feeder Fund?:** No

- **A.8 - Is this a Master Fund?:** No

- **A.9 - Is this series primarily used to fund insurance company separate accounts?:** No

- **A.10 - Money Market Fund Category:** Exempt Government

- **A.11 - WAM:** 10 days

- **A.12 - WAL:** 10 days

- **Total Value of Portfolio Securities:** $470762750.90

- **Amortized Cost of Portfolio Securities:** $470765406.54

- **Cash:** $297.27

- **Total Other Assets:** $438728.85

- **Total Liabilities:** $1672360.69

- **Net Assets of Series:** $469532071.97

- **Number of Shares Outstanding (Series):** 469538648.96

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

- **7-Day Gross Yield:** 4.2900%

### Weekly Liquid Assets
| Period         | Daily Liquid Assets ($)   | Weekly Liquid Assets ($)   | Daily Liquid Assets (%)   | Weekly Liquid Assets (%)   |
|:---|:---|:---|:---|:---|
| Friday, Week 1 |  | $494787318.90              |  | 99.9800%                   |
| Friday, Week 2 |  | $488513379.36              |  | 99.9800%                   |
| Friday, Week 3 |  | $483107061.75              |  | 99.9800%                   |
| Friday, Week 4 |  | $474823381.19              |  | 99.9800%                   |
| Friday, Week 5 |  | $0.00                      |  | 0.0000%                    |

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

### Class: Unknown Class (—)

- **B.2 - Minimum Initial Investment:** $1000.00

- **B.3 - Net Assets of Class:** $469532071.97

- **B.4 - Shares Outstanding:** 469538648.96

- **B.7.7 - 7-Day Net Yield:** 3.8400%

- **Person Paying for Fund Expenses?:** Yes

- **Expense Reimbursement/Waiver Description:** During the period, MFS waived: $5,421 management fees; $43,086 expense limitation.

**Weekly Flows:**

| Period   | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| Week 1   | $6856649.68               | $5618730.67             |
| Week 2   | $1659519.19               | $8873031.48             |
| Week 3   | $1850447.98               | $7242719.11             |
| Week 4   | $3058994.28               | $11579201.74            |

**Monthly Shareholder Flow Activity:**

- **Gross Subscriptions for month:** $14707270.78

- **Gross Redemptions for month:** $38218386.79

## Part C: Schedule of Portfolio Securities

### Security 1: BOFA Securities

- **C.1 - Title:** Bank of America NA 4.260000%
- **C.6 - Investment Category:** U.S. Treasury Repurchase Agreement, if collateralized only by U.S. Treasuries (including Strips) and cash
- **Identifiers:** C.3 - LEI: 549300HN4UKV1E2R3U73, CIK: 0001102113, C.5 - Other ID: 03199T002_4.26_0201
- **C.18 - Value (incl. sponsor support):** $45834000.00
- **C.18.a - Value (excl. sponsor support):** $45834000.00
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 9.7600%
- **C.17 - Yield as of Reporting Date:** 4.2600%
- **C.11 - Maturity Date (WAM):** 2023-02-01
- **C.12 - Maturity Date (WAL):** 2023-02-01
- **C.13 - Final Legal Maturity Date:** 2023-02-01
- **Characteristics:** 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 2: Federal Farm Credit Bank

- **C.1 - Title:** Federal Farm Credit Bank
- **C.6 - Investment Category:** U.S. Government Agency Debt
- **Identifiers:** C.3 - CUSIP: 313312BJ8, C.4 - ISIN: US313312BJ81
- **C.18 - Value (incl. sponsor support):** $28496447.48
- **C.18.a - Value (excl. sponsor support):** $28496447.48
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 6.0700%
- **C.17 - Yield as of Reporting Date:** 2.0800%
- **C.11 - Maturity Date (WAM):** 2023-02-02
- **C.12 - Maturity Date (WAL):** 2023-02-02
- **C.13 - Final Legal Maturity Date:** 2023-02-02
- **Characteristics:** 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 Home Loan Bank

- **C.1 - Title:** Federal Home Loan Bank
- **C.6 - Investment Category:** U.S. Government Agency Debt
- **Identifiers:** C.3 - CUSIP: 313384BH1, C.4 - ISIN: US313384BH11, C.3 - LEI: 2549001DPIFGXC1TOL40
- **C.18 - Value (incl. sponsor support):** $32500000.00
- **C.18.a - Value (excl. sponsor support):** $32500000.00
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 6.9200%
- **C.17 - Yield as of Reporting Date:** 0.0000%
- **C.11 - Maturity Date (WAM):** 2023-02-01
- **C.12 - Maturity Date (WAL):** 2023-02-01
- **C.13 - Final Legal Maturity Date:** 2023-02-01
- **Characteristics:** 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 4: Federal Home Loan Mortgage Corp.

- **C.1 - Title:** Federal Home Loan Mortgage Corp.
- **C.6 - Investment Category:** U.S. Government Agency Debt
- **Identifiers:** C.3 - CUSIP: 313396BH5, C.4 - ISIN: US313396BH58, C.3 - LEI: S6XOOCT0IEG5ABCC6L87
- **C.18 - Value (incl. sponsor support):** $16500000.00
- **C.18.a - Value (excl. sponsor support):** $16500000.00
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 3.5100%
- **C.17 - Yield as of Reporting Date:** 0.0000%
- **C.11 - Maturity Date (WAM):** 2023-02-01
- **C.12 - Maturity Date (WAL):** 2023-02-01
- **C.13 - Final Legal Maturity Date:** 2023-02-01
- **Characteristics:** 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 5: Federal National Mortgage Assoc.

- **C.1 - Title:** Federal National Mortgage Assoc.
- **C.6 - Investment Category:** U.S. Government Agency Debt
- **Identifiers:** C.3 - CUSIP: 313588BH7, C.4 - ISIN: US313588BH72, C.3 - LEI: B1V7KEBTPIMZEU4LTD58
- **C.18 - Value (incl. sponsor support):** $13500000.00
- **C.18.a - Value (excl. sponsor support):** $13500000.00
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 2.8800%
- **C.17 - Yield as of Reporting Date:** 0.0000%
- **C.11 - Maturity Date (WAM):** 2023-02-01
- **C.12 - Maturity Date (WAL):** 2023-02-01
- **C.13 - Final Legal Maturity Date:** 2023-02-01
- **Characteristics:** 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 6: Federal National Mortgage Assoc.

- **C.1 - Title:** Federal National Mortgage Assoc.
- **C.6 - Investment Category:** U.S. Government Agency Debt
- **Identifiers:** C.3 - CUSIP: 313588BN4, C.4 - ISIN: US313588BN41, C.3 - LEI: B1V7KEBTPIMZEU4LTD58
- **C.18 - Value (incl. sponsor support):** $31380434.35
- **C.18.a - Value (excl. sponsor support):** $31380434.35
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 6.6800%
- **C.17 - Yield as of Reporting Date:** 3.5100%
- **C.11 - Maturity Date (WAM):** 2023-02-06
- **C.12 - Maturity Date (WAL):** 2023-02-06
- **C.13 - Final Legal Maturity Date:** 2023-02-06
- **Characteristics:** 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 7: JP Morgan Securities LLC

- **C.1 - Title:** JP Morgan Securities LLC 4.280000%
- **C.6 - Investment Category:** U.S. Treasury Repurchase Agreement, if collateralized only by U.S. Treasuries (including Strips) and cash
- **Identifiers:** C.3 - LEI: ZBUT11V806EZRVTWT807, CIK: 0001168163, C.5 - Other ID: 446199002_4.28_0201
- **C.18 - Value (incl. sponsor support):** $46838000.00
- **C.18.a - Value (excl. sponsor support):** $46838000.00
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 9.9800%
- **C.17 - Yield as of Reporting Date:** 4.2800%
- **C.11 - Maturity Date (WAM):** 2023-02-01
- **C.12 - Maturity Date (WAL):** 2023-02-01
- **C.13 - Final Legal Maturity Date:** 2023-02-01
- **Characteristics:** 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 8: U.S. Treasury Bill

- **C.1 - Title:** U.S. Treasury Bill
- **C.6 - Investment Category:** U.S. Treasury Debt
- **Identifiers:** C.3 - CUSIP: 912796T33, C.4 - ISIN: US912796T338, C.3 - LEI: 254900HROIFWPRGM1V77
- **C.18 - Value (incl. sponsor support):** $41885933.04
- **C.18.a - Value (excl. sponsor support):** $41885933.04
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 8.9200%
- **C.17 - Yield as of Reporting Date:** 4.2000%
- **C.11 - Maturity Date (WAM):** 2023-02-23
- **C.12 - Maturity Date (WAL):** 2023-02-23
- **C.13 - Final Legal Maturity Date:** 2023-02-23
- **Characteristics:** 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 9: U.S. Treasury Bill

- **C.1 - Title:** U.S. Treasury Bill
- **C.6 - Investment Category:** U.S. Treasury Debt
- **Identifiers:** C.3 - CUSIP: 912796XT1, C.4 - ISIN: US912796XT12, C.3 - LEI: 254900HROIFWPRGM1V77
- **C.18 - Value (incl. sponsor support):** $23164427.07
- **C.18.a - Value (excl. sponsor support):** $23164427.07
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 4.9300%
- **C.17 - Yield as of Reporting Date:** 1.9900%
- **C.11 - Maturity Date (WAM):** 2023-02-02
- **C.12 - Maturity Date (WAL):** 2023-02-02
- **C.13 - Final Legal Maturity Date:** 2023-02-02
- **Characteristics:** 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 10: U.S. Treasury Bill

- **C.1 - Title:** U.S. Treasury Bill
- **C.6 - Investment Category:** U.S. Treasury Debt
- **Identifiers:** C.3 - CUSIP: 912796XZ7, C.4 - ISIN: US912796XZ71, C.3 - LEI: 254900HROIFWPRGM1V77
- **C.18 - Value (incl. sponsor support):** $38464291.25
- **C.18.a - Value (excl. sponsor support):** $38464291.25
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 8.1900%
- **C.17 - Yield as of Reporting Date:** 3.5800%
- **C.11 - Maturity Date (WAM):** 2023-02-09
- **C.12 - Maturity Date (WAL):** 2023-02-09
- **C.13 - Final Legal Maturity Date:** 2023-02-09
- **Characteristics:** 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 11: U.S. Treasury Bill

- **C.1 - Title:** U.S. Treasury Bill
- **C.6 - Investment Category:** U.S. Treasury Debt
- **Identifiers:** C.3 - CUSIP: 912796Y60, C.4 - ISIN: US912796Y601, C.3 - LEI: 254900HROIFWPRGM1V77
- **C.18 - Value (incl. sponsor support):** $30425402.19
- **C.18.a - Value (excl. sponsor support):** $30425402.19
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 6.4800%
- **C.17 - Yield as of Reporting Date:** 4.2800%
- **C.11 - Maturity Date (WAM):** 2023-02-21
- **C.12 - Maturity Date (WAL):** 2023-02-21
- **C.13 - Final Legal Maturity Date:** 2023-02-21
- **Characteristics:** 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 12: U.S. Treasury Bill

- **C.1 - Title:** U.S. Treasury Bill
- **C.6 - Investment Category:** U.S. Treasury Debt
- **Identifiers:** C.3 - CUSIP: 912796YB9, C.4 - ISIN: US912796YB94, C.3 - LEI: 254900HROIFWPRGM1V77
- **C.18 - Value (incl. sponsor support):** $48161297.02
- **C.18.a - Value (excl. sponsor support):** $48161297.02
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 10.2600%
- **C.17 - Yield as of Reporting Date:** 4.2800%
- **C.11 - Maturity Date (WAM):** 2023-03-02
- **C.12 - Maturity Date (WAL):** 2023-03-02
- **C.13 - Final Legal Maturity Date:** 2023-03-02
- **Characteristics:** 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: U.S. Treasury Bill

- **C.1 - Title:** U.S. Treasury Bill
- **C.6 - Investment Category:** U.S. Treasury Debt
- **Identifiers:** C.3 - CUSIP: 912796ZT9, C.4 - ISIN: US912796ZT93, C.3 - LEI: 254900HROIFWPRGM1V77
- **C.18 - Value (incl. sponsor support):** $39165793.40
- **C.18.a - Value (excl. sponsor support):** $39165793.40
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 8.3400%
- **C.17 - Yield as of Reporting Date:** 3.6000%
- **C.11 - Maturity Date (WAM):** 2023-02-07
- **C.12 - Maturity Date (WAL):** 2023-02-07
- **C.13 - Final Legal Maturity Date:** 2023-02-07
- **Characteristics:** 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 14: U.S. Treasury Bill

- **C.1 - Title:** U.S. Treasury Bill
- **C.6 - Investment Category:** U.S. Treasury Debt
- **Identifiers:** C.3 - CUSIP: 912796ZU6, C.4 - ISIN: US912796ZU66, C.3 - LEI: 254900HROIFWPRGM1V77
- **C.18 - Value (incl. sponsor support):** $34446725.10
- **C.18.a - Value (excl. sponsor support):** $34446725.10
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 7.3400%
- **C.17 - Yield as of Reporting Date:** 4.0700%
- **C.11 - Maturity Date (WAM):** 2023-02-14
- **C.12 - Maturity Date (WAL):** 2023-02-14
- **C.13 - Final Legal Maturity Date:** 2023-02-14
- **Characteristics:** 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:** 2023-02-07

**By:** Kasey L. Phillips

**Name of Signing Officer:** Kasey L. Phillips

**Title of Signing Officer:** Assistant Treasurer