# EDGAR Filing Document

**Accession Number:** 0001392417
**File Stem:** 0001868488-23-000008
**Filing Date:** 2023-2
**Character Count:** 25921
**Document Hash:** 40310e0609b3431d07b36ad099b1e1f6
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001868488-23-000008.hdr.sgml**: 20230207

**ACCESSION NUMBER**: 0001868488-23-000008

**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 INSTITUTIONAL MONEY MARKET PORTFOLIO, A SERIES OF THE MFS SERIES TRUST XIV
- **CENTRAL INDEX KEY:** 0001392417
- **IRS NUMBER:** 208538605
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 0831

**FILING VALUES:**
- **FORM TYPE:** N-MFP2
- **SEC ACT:** 1940 Act
- **SEC FILE NUMBER:** 811-22033
- **FILM NUMBER:** 23593463

**BUSINESS ADDRESS:**
- **STREET 1:** 111 HUNTINGTON AVENUE
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02199
- **BUSINESS PHONE:** 617-954-5000

**MAIL ADDRESS:**
- **STREET 1:** 111 HUNTINGTON AVENUE
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02199

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MFS Institutional Money Market Portfolio, a series of the MFS Series Trust XIV
- **DATE OF NAME CHANGE:** 20090313

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MFS Series Trust XIV
- **DATE OF NAME CHANGE:** 20070308

## Series and Classes Contracts Data

### MFS Institutional Money Market Portfolio (Series ID: S000017728)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000048969 | Class A      |  |

# 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:** S000017728

**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.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:** Prime

- **A.11 - WAM:** 12 days

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

- **Total Value of Portfolio Securities:** $5924280823.00

- **Amortized Cost of Portfolio Securities:** $226119000.00

- **Cash:** $178.22

- **Total Other Assets:** $46729.02

- **Total Liabilities:** $20992171.70

- **Net Assets of Series:** $5903335558.54

- **Number of Shares Outstanding (Series):** 5903034321.24

- **7-Day Gross Yield:** 4.3000%

### Weekly Liquid Assets
| Period         | Daily Liquid Assets ($)   | Weekly Liquid Assets ($)   | Daily Liquid Assets (%)   | Weekly Liquid Assets (%)   |
|:---|:---|:---|:---|:---|
| Friday, Week 1 |  | $5428407638.01             |  | 93.3100%                   |
| Friday, Week 2 |  | $5396030037.59             |  | 91.6400%                   |
| Friday, Week 3 |  | $5317851239.89             |  | 88.7200%                   |
| Friday, Week 4 |  | $5258452498.20             |  | 87.8800%                   |

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

### Class: Unknown Class (—)

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

- **B.3 - Net Assets of Class:** $5903335558.54

- **B.4 - Shares Outstanding:** 5903034321.24

- **B.7.7 - 7-Day Net Yield:** 4.2900%

- **Person Paying for Fund Expenses?:** No

**Weekly Flows:**

| Period   | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| Week 1   | $1021154704.04            | $1083326620.64          |
| Week 2   | $1022931947.71            | $957029947.57           |
| Week 3   | $838088630.77             | $737102598.78           |
| Week 4   | $1126561889.04            | $1141529076.32          |

**Monthly Shareholder Flow Activity:**

- **Gross Subscriptions for month:** $4294973104.37

- **Gross Redemptions for month:** $4266451202.19

## Part C: Schedule of Portfolio Securities

### Security 1: Alphabet, Inc.

- **C.1 - Title:** Alphabet, Inc. 4.488
- **C.6 - Investment Category:** Non-Financial Company Commercial Paper
- **Identifiers:** C.3 - CUSIP: 02079QPE8, C.4 - ISIN: US02079QPE88, C.3 - LEI: 5493006MHB84DD0ZWV18
- **C.18 - Value (incl. sponsor support):** $99823444.00
- **C.18.a - Value (excl. sponsor support):** $99823444.00
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 1.6900%
- **C.17 - Yield as of Reporting Date:** 4.4900%
- **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.21 Is a Weekly Liquid Asset? No, C.23 Categorized at Level 3? No

### Security 2: Apple, Inc.

- **C.1 - Title:** Apple, Inc. 4.283
- **C.6 - Investment Category:** Non-Financial Company Commercial Paper
- **Identifiers:** C.3 - CUSIP: 03785EP65, C.4 - ISIN: US03785EP656, C.3 - LEI: HWUPKR0MPOU8FGXBT394
- **C.18 - Value (incl. sponsor support):** $69948246.90
- **C.18.a - Value (excl. sponsor support):** $69948246.90
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 1.1900%
- **C.17 - Yield as of Reporting Date:** 4.2800%
- **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.21 Is a Weekly Liquid Asset? Yes, C.23 Categorized at Level 3? No

### Security 3: Apple, Inc.

- **C.1 - Title:** Apple, Inc. 0.000
- **C.6 - Investment Category:** Non-Financial Company Commercial Paper
- **Identifiers:** C.3 - CUSIP: 03785EP16, C.4 - ISIN: US03785EP169, C.3 - LEI: HWUPKR0MPOU8FGXBT394
- **C.18 - Value (incl. sponsor support):** $149982025.50
- **C.18.a - Value (excl. sponsor support):** $149982025.50
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 2.5400%
- **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: Australia & New Zealand Banking Group Ltd.

- **C.1 - Title:** Australia & New Zealand Banking Group Ltd. 4.672
- **C.6 - Investment Category:** Financial Company Commercial Paper
- **Identifiers:** C.3 - CUSIP: 05253CRB4, C.4 - ISIN: US05253CRB45, C.3 - LEI: JHE42UYNWWTJB8YTTU19
- **C.18 - Value (incl. sponsor support):** $183404734.21
- **C.18.a - Value (excl. sponsor support):** $183404734.21
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 3.1100%
- **C.17 - Yield as of Reporting Date:** 4.6700%
- **C.11 - Maturity Date (WAM):** 2023-04-11
- **C.12 - Maturity Date (WAL):** 2023-04-11
- **C.13 - Final Legal Maturity Date:** 2023-04-11
- **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.21 Is a Weekly Liquid Asset? No, C.23 Categorized at Level 3? No

### Security 5: BOFA Securities Repurchase Agreement

- **C.1 - Title:** BOFA Securities Repurchase Agreement 4.26
- **C.6 - Investment Category:** U.S. Treasury Repurchase Agreement, if collateralized only by U.S. Treasuries (including Strips) and cash
- **Identifiers:** C.3 - CUSIP: 5H1589D, C.3 - LEI: 549300HN4UKV1E2R3U73, CIK: 0000065100
- **C.18 - Value (incl. sponsor support):** $102119000.00
- **C.18.a - Value (excl. sponsor support):** $102119000.00
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 1.7300%
- **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 6: Federal Farm Credit Banks

- **C.1 - Title:** Federal Farm Credit Banks 4.141
- **C.6 - Investment Category:** U.S. Government Agency Debt
- **Identifiers:** C.3 - CUSIP: 313312BJ8, C.4 - ISIN: US313312BJ81
- **C.18 - Value (incl. sponsor support):** $25996737.00
- **C.18.a - Value (excl. sponsor support):** $25996737.00
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 0.4400%
- **C.17 - Yield as of Reporting Date:** 4.1400%
- **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.21 Is a Weekly Liquid Asset? Yes, C.23 Categorized at Level 3? No

### Security 7: Federal Home Loan Banks

- **C.1 - Title:** Federal Home Loan Banks 0.000
- **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):** $2308000000.00
- **C.18.a - Value (excl. sponsor support):** $2308000000.00
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 39.1000%
- **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 8: Federal Home Loan Banks

- **C.1 - Title:** Federal Home Loan Banks 4.106
- **C.6 - Investment Category:** U.S. Government Agency Debt
- **Identifiers:** C.3 - CUSIP: 313384BK4, C.4 - ISIN: US313384BK40, C.3 - LEI: 2549001DPIFGXC1TOL40
- **C.18 - Value (incl. sponsor support):** $387900396.52
- **C.18.a - Value (excl. sponsor support):** $387900396.52
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 6.5700%
- **C.17 - Yield as of Reporting Date:** 4.1100%
- **C.11 - Maturity Date (WAM):** 2023-02-03
- **C.12 - Maturity Date (WAL):** 2023-02-03
- **C.13 - Final Legal Maturity Date:** 2023-02-03
- **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.21 Is a Weekly Liquid Asset? Yes, C.23 Categorized at Level 3? No

### Security 9: Federal Home Loan Mortgage Corp.

- **C.1 - Title:** Federal Home Loan Mortgage Corp. 0.000
- **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):** $269315000.00
- **C.18.a - Value (excl. sponsor support):** $269315000.00
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 4.5600%
- **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 10: Federal National Mortgage Association Discount

- **C.1 - Title:** Federal National Mortgage Association Discount 4.203
- **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):** $19987453.00
- **C.18.a - Value (excl. sponsor support):** $19987453.00
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 0.3400%
- **C.17 - Yield as of Reporting Date:** 4.2000%
- **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.21 Is a Weekly Liquid Asset? Yes, C.23 Categorized at Level 3? No

### Security 11: Goldman Sachs Repurchase Agreement

- **C.1 - Title:** Goldman Sachs Repurchase Agreement 4.24
- **C.6 - Investment Category:** U.S. Treasury Repurchase Agreement, if collateralized only by U.S. Treasuries (including Strips) and cash
- **Identifiers:** C.3 - CUSIP: 5H1604D, C.3 - LEI: FOR8UP27PHTHYVLBNG30, CIK: 0000042352
- **C.18 - Value (incl. sponsor support):** $50000000.00
- **C.18.a - Value (excl. sponsor support):** $50000000.00
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 0.8500%
- **C.17 - Yield as of Reporting Date:** 4.2400%
- **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 12: J.P. Morgan Repurchase Agreement

- **C.1 - Title:** J.P. Morgan Repurchase Agreement 4.28
- **C.6 - Investment Category:** U.S. Treasury Repurchase Agreement, if collateralized only by U.S. Treasuries (including Strips) and cash
- **Identifiers:** C.3 - CUSIP: 5H1605D, C.3 - LEI: ZBUT11V806EZRVTWT807, CIK: 0000782124
- **C.18 - Value (incl. sponsor support):** $74000000.00
- **C.18.a - Value (excl. sponsor support):** $74000000.00
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 1.2500%
- **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 13: Johnson & Johnson

- **C.1 - Title:** Johnson & Johnson 4.473
- **C.6 - Investment Category:** Non-Financial Company Commercial Paper
- **Identifiers:** C.3 - CUSIP: 47816GQD4, C.4 - ISIN: US47816GQD42, C.3 - LEI: 549300G0CFPGEF6X2043
- **C.18 - Value (incl. sponsor support):** $149228004.00
- **C.18.a - Value (excl. sponsor support):** $149228004.00
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 2.5300%
- **C.17 - Yield as of Reporting Date:** 4.4700%
- **C.11 - Maturity Date (WAM):** 2023-03-13
- **C.12 - Maturity Date (WAL):** 2023-03-13
- **C.13 - Final Legal Maturity Date:** 2023-03-13
- **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.21 Is a Weekly Liquid Asset? No, C.23 Categorized at Level 3? No

### Security 14: Mizuho Bank Ltd.

- **C.1 - Title:** Mizuho Bank Ltd. 4.726
- **C.6 - Investment Category:** Financial Company Commercial Paper
- **Identifiers:** C.3 - CUSIP: 60689GRQ1, C.4 - ISIN: US60689GRQ19, C.3 - LEI: RB0PEZSDGCO3JS6CEU02
- **C.18 - Value (incl. sponsor support):** $98925381.00
- **C.18.a - Value (excl. sponsor support):** $98925381.00
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 1.6800%
- **C.17 - Yield as of Reporting Date:** 4.7300%
- **C.11 - Maturity Date (WAM):** 2023-04-24
- **C.12 - Maturity Date (WAL):** 2023-04-24
- **C.13 - Final Legal Maturity Date:** 2023-04-24
- **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.21 Is a Weekly Liquid Asset? No, C.23 Categorized at Level 3? No

### Security 15: Toyota Motor Credit Corp.

- **C.1 - Title:** Toyota Motor Credit Corp. 4.521
- **C.6 - Investment Category:** Non-Financial Company Commercial Paper
- **Identifiers:** C.3 - CUSIP: 89233HQA5, C.4 - ISIN: US89233HQA58, C.3 - LEI: Z2VZBHUMB7PWWJ63I008
- **C.18 - Value (incl. sponsor support):** $124406646.25
- **C.18.a - Value (excl. sponsor support):** $124406646.25
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 2.1100%
- **C.17 - Yield as of Reporting Date:** 4.5200%
- **C.11 - Maturity Date (WAM):** 2023-03-10
- **C.12 - Maturity Date (WAL):** 2023-03-10
- **C.13 - Final Legal Maturity Date:** 2023-03-10
- **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.21 Is a Weekly Liquid Asset? No, C.23 Categorized at Level 3? No

### Security 16: United States Treasury Bill

- **C.1 - Title:** United States Treasury Bill 4.382
- **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):** $192475736.73
- **C.18.a - Value (excl. sponsor support):** $192475736.73
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 3.2600%
- **C.17 - Yield as of Reporting Date:** 4.3800%
- **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 17: United States Treasury Bill

- **C.1 - Title:** United States Treasury Bill 4.486
- **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):** $216967829.70
- **C.18.a - Value (excl. sponsor support):** $216967829.70
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 3.6800%
- **C.17 - Yield as of Reporting Date:** 4.4900%
- **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 18: United States Treasury Bill

- **C.1 - Title:** United States Treasury Bill 4.418
- **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):** $174375845.00
- **C.18.a - Value (excl. sponsor support):** $174375845.00
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 2.9500%
- **C.17 - Yield as of Reporting Date:** 4.4200%
- **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 19: United States Treasury Bill

- **C.1 - Title:** United States Treasury Bill 3.893
- **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):** $274808633.00
- **C.18.a - Value (excl. sponsor support):** $274808633.00
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 4.6600%
- **C.17 - Yield as of Reporting Date:** 3.8900%
- **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 20: United States Treasury Bill

- **C.1 - Title:** United States Treasury Bill 4.374
- **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):** $209672589.00
- **C.18.a - Value (excl. sponsor support):** $209672589.00
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 3.5500%
- **C.17 - Yield as of Reporting Date:** 4.3700%
- **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

### Security 21: United States Treasury Bill

- **C.1 - Title:** United States Treasury Bill 4.063
- **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):** $204308878.39
- **C.18.a - Value (excl. sponsor support):** $204308878.39
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 3.4600%
- **C.17 - Yield as of Reporting Date:** 4.0600%
- **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 22: United States Treasury Bill

- **C.1 - Title:** United States Treasury Bill 4.493
- **C.6 - Investment Category:** U.S. Treasury Debt
- **Identifiers:** C.3 - CUSIP: 912796YK9, C.4 - ISIN: US912796YK93, C.3 - LEI: 254900HROIFWPRGM1V77
- **C.18 - Value (incl. sponsor support):** $298661250.00
- **C.18.a - Value (excl. sponsor support):** $298661250.00
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 5.0600%
- **C.17 - Yield as of Reporting Date:** 4.4900%
- **C.11 - Maturity Date (WAM):** 2023-03-09
- **C.12 - Maturity Date (WAL):** 2023-03-09
- **C.13 - Final Legal Maturity Date:** 2023-03-09
- **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 23: United States Treasury Bill

- **C.1 - Title:** United States Treasury Bill 3.950
- **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):** $239972992.80
- **C.18.a - Value (excl. sponsor support):** $239972992.80
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 4.0700%
- **C.17 - Yield as of Reporting Date:** 3.9500%
- **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

## N-MFP: Signatures

**Registrant:** MFS INSTITUTIONAL MONEY MARKET PORTFOLIO, A SERIES OF THE MFS SERIES TRUST XIV

**Date:** 2023-02-02

**By:** Kino Clark

**Name of Signing Officer:** Kino Clark

**Title of Signing Officer:** Assistant Treasurer