# EDGAR Filing Document

**Accession Number:** 0000798244
**File Stem:** 0001145549-23-005355
**Filing Date:** 2023-2
**Character Count:** 25646
**Document Hash:** 843d5c89c21017913000639add6904db
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001145549-23-005355.hdr.sgml**: 20230207

**ACCESSION NUMBER**: 0001145549-23-005355

**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 I
- **CENTRAL INDEX KEY:** 0000798244
- **IRS NUMBER:** 000000000
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 1130

**FILING VALUES:**
- **FORM TYPE:** N-MFP2
- **SEC ACT:** 1940 Act
- **SEC FILE NUMBER:** 811-04777
- **FILM NUMBER:** 23593280

**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 SERIES TRUST I /MA/
- **DATE OF NAME CHANGE:** 19940427

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MFS LIFETIME MANAGED SECTORS FUND
- **DATE OF NAME CHANGE:** 19930408

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** LIFETIME MANAGED SECTORS TRUST
- **DATE OF NAME CHANGE:** 19920703

## Series and Classes Contracts Data

### MFS U.S. Government Cash Reserve Fund (Series ID: S000000762)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000002179 | A            | MSRXX           |
| C000002182 | B            | MCRXX           |
| C000002183 | C            | MCCXX           |
| C000002184 | R1           | CRVXX           |
| C000002186 | R2           | CRMXX           |
| C000002187 | R3           | CRJXX           |
| C000002188 | R4           | CRKXX           |
| C000206004 | R6           | CRRXX           |
| C000206005 | I            | CRHXX           |

# 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:** S000000762

**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:** 033-07638

- **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:** $492605932.95

- **Amortized Cost of Portfolio Securities:** $492608430.46

- **Cash:** $506.01

- **Total Other Assets:** $186331.80

- **Total Liabilities:** $2239018.04

- **Net Assets of Series:** $490556250.23

- **Number of Shares Outstanding (Series):** 490791058.24

- **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 |  | $512785808.93              |  | 99.7900%                   |
| Friday, Week 2 |  | $503899590.28              |  | 99.9700%                   |
| Friday, Week 3 |  | $500838658.37              |  | 99.9700%                   |
| Friday, Week 4 |  | $494470261.90              |  | 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:** $182953546.78

- **B.4 - Shares Outstanding:** 183041445.72

- **B.7.7 - 7-Day Net Yield:** 3.8800%

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

- **Expense Reimbursement/Waiver Description:** For Class A during the period, MFS waived: $2,124 management fees; $22,935 expense limitation; MFD waived: $40,340 12b-1 fees.

**Weekly Flows:**

| Period   | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| Week 1   | $2761681.68               | $2715746.72             |
| Week 2   | $1100414.12               | $6456331.70             |
| Week 3   | $2893972.94               | $3172975.84             |
| Week 4   | $1061639.70               | $5706315.02             |

**Monthly Shareholder Flow Activity:**

- **Gross Subscriptions for month:** $8215506.12

- **Gross Redemptions for month:** $19831423.79

### Class: Unknown Class (—)

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

- **B.3 - Net Assets of Class:** $4419752.23

- **B.4 - Shares Outstanding:** 4421865.78

- **B.7.7 - 7-Day Net Yield:** 3.8800%

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

- **Expense Reimbursement/Waiver Description:** For Class B during the period, MFS waived: $52 management fees; $554 expense limitation; MFD waived: $3,904 12b-1 fees.

**Weekly Flows:**

| Period   | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| Week 1   | $13987.90                 | $3095.00                |
| Week 2   | $0.00                     | $102426.92              |
| Week 3   | $9083.60                  | $26030.89               |
| Week 4   | $86.22                    | $163537.98              |

**Monthly Shareholder Flow Activity:**

- **Gross Subscriptions for month:** $23157.72

- **Gross Redemptions for month:** $307724.52

### Class: Unknown Class (—)

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

- **B.3 - Net Assets of Class:** $28390806.42

- **B.4 - Shares Outstanding:** 28404402.18

- **B.7.7 - 7-Day Net Yield:** 3.8800%

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

- **Expense Reimbursement/Waiver Description:** For Class C during the period, MFS waived: $342 management fees; $3,725 expense limitation; MFD waived: $25,876 12b-1 fees.

**Weekly Flows:**

| Period   | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| Week 1   | $122743.46                | $1290702.43             |
| Week 2   | $261100.40                | $2024974.90             |
| Week 3   | $56672.64                 | $1452858.33             |
| Week 4   | $180395.55                | $732338.38              |

**Monthly Shareholder Flow Activity:**

- **Gross Subscriptions for month:** $652334.66

- **Gross Redemptions for month:** $5653612.66

### Class: Unknown Class (—)

- **B.2 - Minimum Initial Investment:** $1.00

- **B.3 - Net Assets of Class:** $9085052.41

- **B.4 - Shares Outstanding:** 9089411.38

- **B.7.7 - 7-Day Net Yield:** 3.8800%

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

- **Expense Reimbursement/Waiver Description:** For Class R1 during the period, MFS waived: $101 management fees; $1,085 expense limitation; MFD waived: $7,698 12b-1 fees.

**Weekly Flows:**

| Period   | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| Week 1   | $38006.14                 | $169889.13              |
| Week 2   | $7756.55                  | $1168.38                |
| Week 3   | $10626.21                 | $4205.90                |
| Week 4   | $100028.06                | $1533.53                |

**Monthly Shareholder Flow Activity:**

- **Gross Subscriptions for month:** $165356.69

- **Gross Redemptions for month:** $242033.61

### Class: Unknown Class (—)

- **B.2 - Minimum Initial Investment:** $1.00

- **B.3 - Net Assets of Class:** $19716142.00

- **B.4 - Shares Outstanding:** 19725567.15

- **B.7.7 - 7-Day Net Yield:** 3.8700%

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

- **Expense Reimbursement/Waiver Description:** For Class R2 during the period, MFS waived: $227 management fees; $2,448 expense limitation; MFD waived: $8,650 12b-1 fees.

**Weekly Flows:**

| Period   | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| Week 1   | $173027.18                | $90199.79               |
| Week 2   | $47544.09                 | $1617537.02             |
| Week 3   | $57072.57                 | $155751.79              |
| Week 4   | $45568.32                 | $161594.32              |

**Monthly Shareholder Flow Activity:**

- **Gross Subscriptions for month:** $332337.78

- **Gross Redemptions for month:** $2083870.59

### Class: Unknown Class (—)

- **B.2 - Minimum Initial Investment:** $1.00

- **B.3 - Net Assets of Class:** $17715645.46

- **B.4 - Shares Outstanding:** 17724091.40

- **B.7.7 - 7-Day Net Yield:** 3.8800%

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

- **Expense Reimbursement/Waiver Description:** For Class R3 during the period, MFS waived: $200 management fees; $2,147 expense limitation; MFD waived: $3,794 12b-1 fees.

**Weekly Flows:**

| Period   | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| Week 1   | $106324.25                | $94875.58               |
| Week 2   | $7955.75                  | $74670.39               |
| Week 3   | $42445.49                 | $171771.27              |
| Week 4   | $16431.03                 | $78731.41               |

**Monthly Shareholder Flow Activity:**

- **Gross Subscriptions for month:** $176536.43

- **Gross Redemptions for month:** $420048.65

### Class: Unknown Class (—)

- **B.2 - Minimum Initial Investment:** $1.00

- **B.3 - Net Assets of Class:** $2708612.61

- **B.4 - Shares Outstanding:** 2709904.19

- **B.7.7 - 7-Day Net Yield:** 3.8800%

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

- **Expense Reimbursement/Waiver Description:** For Class R4 during the period, MFS waived: $30 management fees; $326 expense limitation.

**Weekly Flows:**

| Period   | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| Week 1   | $8005.62                  | $0.00                   |
| Week 4   | $0.00                     | $29.30                  |

**Monthly Shareholder Flow Activity:**

- **Gross Subscriptions for month:** $7976.32

- **Gross Redemptions for month:** $0.00

### Class: Unknown Class (—)

- **B.2 - Minimum Initial Investment:** $1.00

- **B.3 - Net Assets of Class:** $209206782.07

- **B.4 - Shares Outstanding:** 209306659.11

- **B.7.7 - 7-Day Net Yield:** 3.9200%

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

- **Expense Reimbursement/Waiver Description:** For Class R6 during the period, MFS waived: $2,355 management fee; $25,333 expense limitation.

**Weekly Flows:**

| Period   | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| Week 1   | $635163.41                | $1078802.18             |
| Week 2   | $9.87                     | $1314695.69             |
| Week 3   | $105138.42                | $925802.61              |
| Week 4   | $28632.70                 | $683817.72              |

**Monthly Shareholder Flow Activity:**

- **Gross Subscriptions for month:** $768944.40

- **Gross Redemptions for month:** $4251807.20

### Class: Unknown Class (—)

- **B.2 - Minimum Initial Investment:** $1.00

- **B.3 - Net Assets of Class:** $16359910.25

- **B.4 - Shares Outstanding:** 16367711.33

- **B.7.7 - 7-Day Net Yield:** 3.8900%

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

- **Expense Reimbursement/Waiver Description:** For Class I during the period, MFS waived: $185 management fees; $1,997 expense limitation.

**Weekly Flows:**

| Period   | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| Week 1   | $85007.77                 | $308857.42              |
| Week 2   | $614956.59                | $209497.97              |
| Week 3   | $120725.35                | $93030.02               |
| Week 4   | $28661.82                 | $481641.02              |

**Monthly Shareholder Flow Activity:**

- **Gross Subscriptions for month:** $849359.03

- **Gross Redemptions for month:** $1093026.43

## 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):** $49846000.00
- **C.18.a - Value (excl. sponsor support):** $49846000.00
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 10.1600%
- **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):** $29996260.50
- **C.18.a - Value (excl. sponsor support):** $29996260.50
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 6.1100%
- **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):** $33500000.00
- **C.18.a - Value (excl. sponsor support):** $33500000.00
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 6.8300%
- **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):** $17000000.00
- **C.18.a - Value (excl. sponsor support):** $17000000.00
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 3.4700%
- **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):** $15000000.00
- **C.18.a - Value (excl. sponsor support):** $15000000.00
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 3.0600%
- **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):** $31480372.04
- **C.18.a - Value (excl. sponsor support):** $31480372.04
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 6.4200%
- **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):** $50937000.00
- **C.18.a - Value (excl. sponsor support):** $50937000.00
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 10.3800%
- **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):** $42883217.16
- **C.18.a - Value (excl. sponsor support):** $42883217.16
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 8.7400%
- **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):** $25497167.97
- **C.18.a - Value (excl. sponsor support):** $25497167.97
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 5.2000%
- **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):** $37465218.75
- **C.18.a - Value (excl. sponsor support):** $37465218.75
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 7.6400%
- **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):** $33916841.78
- **C.18.a - Value (excl. sponsor support):** $33916841.78
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 6.9100%
- **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):** $48992334.23
- **C.18.a - Value (excl. sponsor support):** $48992334.23
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 9.9900%
- **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):** $40147111.72
- **C.18.a - Value (excl. sponsor support):** $40147111.72
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 8.1800%
- **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):** $35944408.80
- **C.18.a - Value (excl. sponsor support):** $35944408.80
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 7.3300%
- **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 I

**Date:** 2023-02-07

**By:** Kino Clark

**Name of Signing Officer:** Kino Clark

**Title of Signing Officer:** Assistant Treasurer