# EDGAR Filing Document

**Accession Number:** 0001107414
**File Stem:** 0001145549-25-045998
**Filing Date:** 2025-7
**Character Count:** 12999
**Document Hash:** ff6ed6a9442c15485b5fbd576d3b198d
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001145549-25-045998.hdr.sgml**: 20250708

**ACCESSION NUMBER**: 0001145549-25-045998

**CONFORMED SUBMISSION TYPE**: N-MFP3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20250630

**FILED AS OF DATE**: 20250708

**DATE AS OF CHANGE**: 20250708

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** STATE STREET INSTITUTIONAL INVESTMENT TRUST
- **CENTRAL INDEX KEY:** 0001107414

**ORGANIZATION NAME:**
- **EIN:** 046910804
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** N-MFP3
- **SEC ACT:** 1940 Act
- **SEC FILE NUMBER:** 811-09819
- **FILM NUMBER:** 251109982

**BUSINESS ADDRESS:**
- **STREET 1:** ONE IRON STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02210
- **BUSINESS PHONE:** 6176643920

**MAIL ADDRESS:**
- **STREET 1:** ONE IRON STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02210

## Series and Classes Contracts Data

### State Street Federal Government Money Market Fund (Series ID: S000086383)

| Class ID   | Class Name      | Ticker Symbol   |
|:---|:---|:---|
| C000251886 | Advantage Class | AGFXX           |

# Form N-MFP3: Monthly Schedule of Portfolio Holdings

## N-MFP: Filer Information
**Submission Type:** N-MFP3
**CIK:** 0001107414

### General Information

**Report for (YYYY-MM-DD):** 2025-06-30

**Registrant Full Name:** STATE STREET INSTITUTIONAL INVESTMENT TRUST

**CIK Number of Registrant:** 0001107414

**LEI of Registrant:** 549300P1E098W6ES7M39

**Name of Series:** State Street Federal Government Money Market Fund

**LEI of Series:** 98450099C3D5363FC713

**EDGAR Series Identifier:** S000086383

**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            | SSGA Funds Management, Inc.                     | 801-60103         |
| Independent Public Accountant | Ernst & Young  LLP<br>City: Boston<br>State: MA |  |
| Administrator                 | SSGA Funds Management, Inc.                     |  |
| Transfer Agent                | SS&C GIDS, Inc.<br>CIK: 0000027048              | 084-00448         |

### Fund Characteristics & Assets

- **Securities Act File Number:** 333-30810

- **Is this a Feeder Fund?:** Yes

- **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:** 1 days

- **WAL:** 1 days

- **Total Value of Portfolio Securities:** $112560104.94

- **Amortized Cost of Portfolio Securities:** $112560104.94

- **Cash:** $0.00

- **Total Other Assets:** $0.00

- **Total Liabilities:** $391332.22

- **Net Assets of Series:** $112168772.72

- **Number of Shares Outstanding (Series):** 112168632.6500

- **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 (%)   |
|:---|:---|:---|:---|:---|
| 2025-06-02 | $150293018689.22          | $150893018689.22           | 84.2600%                  | 84.6000%                   |
| 2025-06-03 | $147942943133.45          | $148542943133.45           | 84.0500%                  | 84.3900%                   |
| 2025-06-04 | $147735129192.30          | $148335129192.30           | 83.9900%                  | 84.3300%                   |
| 2025-06-05 | $144135579400.06          | $145336100915.06           | 83.9500%                  | 84.6500%                   |
| 2025-06-06 | $142802056744.25          | $144179657008.94           | 83.8100%                  | 84.6100%                   |
| 2025-06-09 | $146118155265.44          | $147495912082.26           | 84.1200%                  | 84.9100%                   |
| 2025-06-10 | $148202209377.81          | $149580021809.96           | 84.3100%                  | 85.0900%                   |
| 2025-06-11 | $151108794843.64          | $151751662763.67           | 84.6400%                  | 85.0000%                   |
| 2025-06-12 | $147622243342.41          | $148265163324.65           | 84.3400%                  | 84.7100%                   |
| 2025-06-13 | $145197606294.16          | $145840584824.45           | 84.1000%                  | 84.4800%                   |
| 2025-06-16 | $145553624766.65          | $146196759104.75           | 84.1400%                  | 84.5100%                   |
| 2025-06-17 | $145042574384.99          | $145485742684.52           | 84.1900%                  | 84.4500%                   |
| 2025-06-18 | $152101538780.21          | $152544776990.48           | 84.6800%                  | 84.9300%                   |
| 2025-06-20 | $140804550593.32          | $142239704629.23           | 83.3300%                  | 84.1800%                   |
| 2025-06-23 | $147672885939.44          | $148116378583.79           | 84.2900%                  | 84.5500%                   |
| 2025-06-24 | $147602705834.27          | $148046245411.71           | 84.2900%                  | 84.5400%                   |
| 2025-06-25 | $150676540845.95          | $151120142611.93           | 84.5500%                  | 84.8000%                   |
| 2025-06-26 | $147142028899.12          | $147585682602.52           | 84.2400%                  | 84.4900%                   |
| 2025-06-27 | $150912084825.03          | $151355792839.65           | 84.5600%                  | 84.8100%                   |
| 2025-06-30 | $149484388829.77          | $149928239320.40           | 84.4500%                  | 84.7000%                   |

### 7-Day Gross Yield
| Date       | 7-Day Gross Yield   |
|:---|:---|
| 2025-06-02 | 4.3800%             |
| 2025-06-03 | 4.3700%             |
| 2025-06-04 | 4.3700%             |
| 2025-06-05 | 4.3700%             |
| 2025-06-06 | 4.3400%             |
| 2025-06-09 | 4.3400%             |
| 2025-06-10 | 4.3400%             |
| 2025-06-11 | 4.3400%             |
| 2025-06-12 | 4.3400%             |
| 2025-06-13 | 4.3400%             |
| 2025-06-16 | 4.3400%             |
| 2025-06-17 | 4.3400%             |
| 2025-06-18 | 4.3500%             |
| 2025-06-20 | 4.3500%             |
| 2025-06-23 | 4.3500%             |
| 2025-06-24 | 4.3500%             |
| 2025-06-25 | 4.3500%             |
| 2025-06-26 | 4.3600%             |
| 2025-06-27 | 4.3800%             |
| 2025-06-30 | 4.3800%             |

### Daily Net Asset Value per Share (Series)
| Date       | Net Asset Value per Share   |
|:---|:---|
| 2025-06-02 | 1.0000                      |
|  |  |
| 2025-06-03 | 1.0000                      |
|  |  |
| 2025-06-04 | 1.0000                      |
|  |  |
| 2025-06-05 | 1.0000                      |
|  |  |
| 2025-06-06 | 1.0000                      |
|  |  |
| 2025-06-09 | 1.0000                      |
|  |  |
| 2025-06-10 | 1.0000                      |
|  |  |
| 2025-06-11 | 1.0000                      |
|  |  |
| 2025-06-12 | 1.0000                      |
|  |  |
| 2025-06-13 | 1.0000                      |
|  |  |
| 2025-06-16 | 1.0000                      |
|  |  |
| 2025-06-17 | 1.0000                      |
|  |  |
| 2025-06-18 | 1.0000                      |
|  |  |
| 2025-06-20 | 1.0000                      |
|  |  |
| 2025-06-23 | 1.0000                      |
|  |  |
| 2025-06-24 | 1.0000                      |
|  |  |
| 2025-06-25 | 1.0000                      |
|  |  |
| 2025-06-26 | 1.0000                      |
|  |  |
| 2025-06-27 | 1.0001                      |
|  |  |
| 2025-06-30 | 1.0001                      |
|  |  |

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

### Class: Advantage Class

- **Minimum Initial Investment:** $1000000.00

- **Net Assets of Class:** $112168772.72

- **Number of Shares Outstanding:** 112168632.6500

- **Expense Reimbursement/Waiver:** 6140.00

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2025-06-02 | 1.0000          |
|  |  |
| 2025-06-03 | 1.0000          |
|  |  |
| 2025-06-04 | 1.0000          |
|  |  |
| 2025-06-05 | 1.0000          |
|  |  |
| 2025-06-06 | 1.0000          |
|  |  |
| 2025-06-09 | 1.0000          |
|  |  |
| 2025-06-10 | 1.0000          |
|  |  |
| 2025-06-11 | 1.0000          |
|  |  |
| 2025-06-12 | 1.0000          |
|  |  |
| 2025-06-13 | 1.0000          |
|  |  |
| 2025-06-16 | 1.0000          |
|  |  |
| 2025-06-17 | 1.0000          |
|  |  |
| 2025-06-18 | 1.0000          |
|  |  |
| 2025-06-20 | 1.0000          |
|  |  |
| 2025-06-23 | 1.0000          |
|  |  |
| 2025-06-24 | 1.0000          |
|  |  |
| 2025-06-25 | 1.0000          |
|  |  |
| 2025-06-26 | 1.0000          |
|  |  |
| 2025-06-27 | 1.0001          |
|  |  |
| 2025-06-30 | 1.0001          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2025-06-02 | $895944.75                | $211963.02              |
| 2025-06-03 | $758824.00                | $35000.00               |
| 2025-06-04 | $1267950.00               | $109475.00              |
| 2025-06-05 | $609098.47                | $381024.00              |
| 2025-06-06 | $4840791.34               | $260783.35              |
| 2025-06-09 | $1617231.63               | $136000.00              |
| 2025-06-10 | $1103252.92               | $630459.81              |
| 2025-06-11 | $1628267.13               | $110199.73              |
| 2025-06-12 | $1855103.81               | $732109.24              |
| 2025-06-13 | $2740007.00               | $12012.51               |
| 2025-06-16 | $1012100.00               | $1070600.00             |
| 2025-06-17 | $810800.03                | $111891.66              |
| 2025-06-18 | $794391.55                | $32000.00               |
| 2025-06-20 | $6780130.00               | $188114.36              |
| 2025-06-23 | $1079266.45               | $220405.00              |
| 2025-06-24 | $470000.00                | $2318766.32             |
| 2025-06-25 | $966400.00                | $69600.00               |
| 2025-06-26 | $709288.00                | $1893033.00             |
| 2025-06-27 | $765000.00                | $14000.00               |
| 2025-06-30 | $1221726.27               | $84100.00               |

**Total Gross Subscriptions (Month):** $31925573.35

**Total Gross Redemptions (Month):** $8621537.00

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2025-06-02 | 3.9900%           |
| 2025-06-03 | 3.9800%           |
| 2025-06-04 | 3.9800%           |
| 2025-06-05 | 3.9800%           |
| 2025-06-06 | 3.9500%           |
| 2025-06-09 | 3.9500%           |
| 2025-06-10 | 3.9500%           |
| 2025-06-11 | 3.9500%           |
| 2025-06-12 | 3.9500%           |
| 2025-06-13 | 3.9500%           |
| 2025-06-16 | 3.9500%           |
| 2025-06-17 | 3.9500%           |
| 2025-06-18 | 3.9600%           |
| 2025-06-20 | 3.9600%           |
| 2025-06-23 | 3.9600%           |
| 2025-06-24 | 3.9600%           |
| 2025-06-25 | 3.9600%           |
| 2025-06-26 | 3.9700%           |
| 2025-06-27 | 3.9900%           |
| 2025-06-30 | 3.9900%           |

**Beneficial/Record Owner Categories**
| Category      | Other Category   | Record Owner %   | Beneficial Owner %   |
|:---|:---|:---|:---|
| Broker-dealer |  | 99.9100%         | 0.0000%              |

## Part C: Schedule of Portfolio Securities

### Security 1: State Street U.S. Government Money Market Portfolio

- **C.1 - Title:** State Street U.S. Government Money Market Portfolio
- **C.6 - Investment Category:** Investment Company
- **Identifiers:** C.3 - CUSIP: FSSgAK1AV, C.3 - LEI: N/A, C.5 - Other ID: FSSgAK1AV
- **C.18 - Value (incl. sponsor support):** $112560104.94
- **C.18.a - Value (excl. sponsor support):** $112560104.94
- **C.19 - Percentage of Net Assets:** 100.0000%
- **C.17 - Yield as of Reporting Date:** 0.0000%
- **C.11 - Maturity Date (WAM):** 2025-07-01
- **C.12 - Maturity Date (WAL):** 2025-07-01
- **C.13 - Final Legal Maturity Date:** 2025-07-01
- **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? Yes, C.21 Is a Weekly Liquid Asset? Yes, C.23 Categorized at Level 3? No

## N-MFP: Signatures

**Registrant:** STATE STREET INSTITUTIONAL INVESTMENT TRUST

**Date:** 2025-07-08

**By:** /s/ Chad Hallett

**Name of Signing Officer:** Chad Hallett

**Title of Signing Officer:** Deputy Treasurer