# EDGAR Filing Document

**Accession Number:** 0001107414
**File Stem:** 0001145549-25-057960
**Filing Date:** 2025-9
**Character Count:** 13363
**Document Hash:** c06745db24fae3be57f41d520b1d1538
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001145549-25-057960.hdr.sgml**: 20250908

**ACCESSION NUMBER**: 0001145549-25-057960

**CONFORMED SUBMISSION TYPE**: N-MFP3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20250831

**FILED AS OF DATE**: 20250908

**DATE AS OF CHANGE**: 20250908

**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:** 251299072

**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):** 2025-08-31

**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:** $129010467.48

- **Amortized Cost of Portfolio Securities:** $129010467.48

- **Cash:** $0.00

- **Total Other Assets:** $0.00

- **Total Liabilities:** $484589.32

- **Net Assets of Series:** $128525878.16

- **Number of Shares Outstanding (Series):** 128525743.8900

- **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 (%)   |
|:---|:---|:---|:---|:---|
| 2025-08-01 | $143734315584.46          | $143912531683.61           | 84.5900%                  | 84.6900%                   |
| 2025-08-04 | $145200857095.04          | $145200857095.04           | 84.8200%                  | 84.8200%                   |
| 2025-08-05 | $150143830664.23          | $150143830664.23           | 85.2400%                  | 85.2400%                   |
| 2025-08-06 | $153080116599.04          | $153080116599.04           | 85.2000%                  | 85.2000%                   |
| 2025-08-07 | $149172265370.95          | $149172265370.95           | 85.0500%                  | 85.0500%                   |
| 2025-08-08 | $146834816565.79          | $147316849525.45           | 84.8400%                  | 85.1200%                   |
| 2025-08-11 | $151223702103.63          | $151705734918.69           | 85.2200%                  | 85.4900%                   |
| 2025-08-12 | $151185386256.96          | $151667418006.73           | 85.0500%                  | 85.3200%                   |
| 2025-08-13 | $151566812414.66          | $152048843624.56           | 85.0800%                  | 85.3500%                   |
| 2025-08-14 | $154567617796.47          | $154567617796.47           | 85.5500%                  | 85.5500%                   |
| 2025-08-15 | $148766095918.97          | $148766095918.97           | 84.8600%                  | 84.8600%                   |
| 2025-08-18 | $147002838452.86          | $147002838452.86           | 84.1800%                  | 84.1800%                   |
| 2025-08-19 | $146071096534.42          | $146071096534.42           | 84.0900%                  | 84.0900%                   |
| 2025-08-20 | $149267290399.16          | $149267290399.16           | 84.3800%                  | 84.3800%                   |
| 2025-08-21 | $144230940079.10          | $144230940079.10           | 83.8100%                  | 83.8100%                   |
| 2025-08-22 | $140077794476.33          | $140077794476.33           | 83.3500%                  | 83.3500%                   |
| 2025-08-25 | $140645954843.44          | $141145954843.44           | 82.9800%                  | 83.2700%                   |
| 2025-08-26 | $140898829111.32          | $141398829111.32           | 83.0000%                  | 83.3000%                   |
| 2025-08-27 | $141398086981.46          | $141898086981.46           | 82.9800%                  | 83.2700%                   |
| 2025-08-28 | $144233175584.72          | $144733175584.72           | 83.2500%                  | 83.5400%                   |
| 2025-08-29 | $145961618073.51          | $146326618073.51           | 83.6400%                  | 83.8500%                   |

### 7-Day Gross Yield
| Date       | 7-Day Gross Yield   |
|:---|:---|
| 2025-08-01 | 4.3500%             |
| 2025-08-04 | 4.3500%             |
| 2025-08-05 | 4.3500%             |
| 2025-08-06 | 4.3400%             |
| 2025-08-07 | 4.3400%             |
| 2025-08-08 | 4.3500%             |
| 2025-08-11 | 4.3500%             |
| 2025-08-12 | 4.3500%             |
| 2025-08-13 | 4.3500%             |
| 2025-08-14 | 4.3500%             |
| 2025-08-15 | 4.3500%             |
| 2025-08-18 | 4.3500%             |
| 2025-08-19 | 4.3500%             |
| 2025-08-20 | 4.3500%             |
| 2025-08-21 | 4.3500%             |
| 2025-08-22 | 4.3400%             |
| 2025-08-25 | 4.3400%             |
| 2025-08-26 | 4.3400%             |
| 2025-08-27 | 4.3400%             |
| 2025-08-28 | 4.3500%             |
| 2025-08-29 | 4.3400%             |

### Daily Net Asset Value per Share (Series)
| Date       | Net Asset Value per Share   |
|:---|:---|
| 2025-08-01 | 1.0002                      |
|  |  |
| 2025-08-04 | 1.0002                      |
|  |  |
| 2025-08-05 | 1.0002                      |
|  |  |
| 2025-08-06 | 1.0002                      |
|  |  |
| 2025-08-07 | 1.0002                      |
|  |  |
| 2025-08-08 | 1.0002                      |
|  |  |
| 2025-08-11 | 1.0002                      |
|  |  |
| 2025-08-12 | 1.0002                      |
|  |  |
| 2025-08-13 | 1.0002                      |
|  |  |
| 2025-08-14 | 1.0002                      |
|  |  |
| 2025-08-15 | 1.0002                      |
|  |  |
| 2025-08-18 | 1.0002                      |
|  |  |
| 2025-08-19 | 1.0002                      |
|  |  |
| 2025-08-20 | 1.0002                      |
|  |  |
| 2025-08-21 | 1.0001                      |
|  |  |
| 2025-08-22 | 1.0002                      |
|  |  |
| 2025-08-25 | 1.0002                      |
|  |  |
| 2025-08-26 | 1.0002                      |
|  |  |
| 2025-08-27 | 1.0002                      |
|  |  |
| 2025-08-28 | 1.0002                      |
|  |  |
| 2025-08-29 | 1.0002                      |
|  |  |

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

### Class: Advantage Class

- **Minimum Initial Investment:** $1000000.00

- **Net Assets of Class:** $128525878.16

- **Number of Shares Outstanding:** 128525743.8900

- **Expense Reimbursement/Waiver:** 7902.15

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2025-08-01 | 1.0002          |
|  |  |
| 2025-08-04 | 1.0002          |
|  |  |
| 2025-08-05 | 1.0002          |
|  |  |
| 2025-08-06 | 1.0002          |
|  |  |
| 2025-08-07 | 1.0002          |
|  |  |
| 2025-08-08 | 1.0002          |
|  |  |
| 2025-08-11 | 1.0002          |
|  |  |
| 2025-08-12 | 1.0002          |
|  |  |
| 2025-08-13 | 1.0002          |
|  |  |
| 2025-08-14 | 1.0002          |
|  |  |
| 2025-08-15 | 1.0002          |
|  |  |
| 2025-08-18 | 1.0002          |
|  |  |
| 2025-08-19 | 1.0002          |
|  |  |
| 2025-08-20 | 1.0002          |
|  |  |
| 2025-08-21 | 1.0001          |
|  |  |
| 2025-08-22 | 1.0002          |
|  |  |
| 2025-08-25 | 1.0002          |
|  |  |
| 2025-08-26 | 1.0002          |
|  |  |
| 2025-08-27 | 1.0002          |
|  |  |
| 2025-08-28 | 1.0002          |
|  |  |
| 2025-08-29 | 1.0002          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2025-08-01 | $836698.50                | $127541.13              |
| 2025-08-04 | $1134354.89               | $54467.60               |
| 2025-08-05 | $511825.52                | $1506886.11             |
| 2025-08-06 | $534224.00                | $990372.06              |
| 2025-08-07 | $1057305.43               | $188302.38              |
| 2025-08-08 | $320745.20                | $347690.35              |
| 2025-08-11 | $1827450.00               | $123565.97              |
| 2025-08-12 | $535072.20                | $339101.48              |
| 2025-08-13 | $614155.00                | $585324.00              |
| 2025-08-14 | $772000.00                | $195368.25              |
| 2025-08-15 | $678401.66                | $516540.09              |
| 2025-08-18 | $534746.08                | $50351.37               |
| 2025-08-19 | $2313150.00               | $357325.22              |
| 2025-08-20 | $1084857.22               | $450000.00              |
| 2025-08-21 | $482000.00                | $38551.66               |
| 2025-08-22 | $786271.92                | $271500.35              |
| 2025-08-25 | $1187241.50               | $551620.00              |
| 2025-08-26 | $916441.28                | $393899.72              |
| 2025-08-27 | $634218.54                | $97434.88               |
| 2025-08-28 | $526371.03                | $553698.52              |
| 2025-08-29 | $840352.00                | $317000.00              |

**Total Gross Subscriptions (Month):** $18127881.97

**Total Gross Redemptions (Month):** $8056541.14

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2025-08-01 | 3.9600%           |
| 2025-08-04 | 3.9600%           |
| 2025-08-05 | 3.9600%           |
| 2025-08-06 | 3.9500%           |
| 2025-08-07 | 3.9500%           |
| 2025-08-08 | 3.9600%           |
| 2025-08-11 | 3.9600%           |
| 2025-08-12 | 3.9600%           |
| 2025-08-13 | 3.9600%           |
| 2025-08-14 | 3.9600%           |
| 2025-08-15 | 3.9600%           |
| 2025-08-18 | 3.9600%           |
| 2025-08-19 | 3.9600%           |
| 2025-08-20 | 3.9600%           |
| 2025-08-21 | 3.9600%           |
| 2025-08-22 | 3.9500%           |
| 2025-08-25 | 3.9500%           |
| 2025-08-26 | 3.9500%           |
| 2025-08-27 | 3.9500%           |
| 2025-08-28 | 3.9600%           |
| 2025-08-29 | 3.9500%           |

**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):** $129010467.48
- **C.18.a - Value (excl. sponsor support):** $129010467.48
- **C.19 - Percentage of Net Assets:** 100.0000%
- **C.17 - Yield as of Reporting Date:** 0.0000%
- **C.11 - Maturity Date (WAM):** 2025-09-02
- **C.12 - Maturity Date (WAL):** 2025-09-02
- **C.13 - Final Legal Maturity Date:** 2025-09-02
- **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

## N-MFP: Signatures

**Registrant:** STATE STREET INSTITUTIONAL INVESTMENT TRUST

**Date:** 2025-09-08

**By:** /s/ Chad Hallett

**Name of Signing Officer:** Chad Hallett

**Title of Signing Officer:** Deputy Treasurer