# EDGAR Filing Document

**Accession Number:** 0001107414
**File Stem:** 0001410368-25-021445
**Filing Date:** 2025-11
**Character Count:** 14100
**Document Hash:** 434402b55f9c9663a9ca340ceafa5e17
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001410368-25-021445.hdr.sgml**: 20251107

**ACCESSION NUMBER**: 0001410368-25-021445

**CONFORMED SUBMISSION TYPE**: N-MFP3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20251031

**FILED AS OF DATE**: 20251107

**DATE AS OF CHANGE**: 20251107

**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:** 251461102

**BUSINESS ADDRESS:**
- **STREET 1:** ONE CONGRESS STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02114
- **BUSINESS PHONE:** 6176643920

**MAIL ADDRESS:**
- **STREET 1:** ONE CONGRESS STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02114

## 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):** 2025-10-31

**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:** $146249700.39

- **Amortized Cost of Portfolio Securities:** $146249700.39

- **Cash:** $0.00

- **Total Other Assets:** $0.00

- **Total Liabilities:** $598536.69

- **Net Assets of Series:** $145651163.70

- **Number of Shares Outstanding (Series):** 145650999.6200

- **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 (%)   |
|:---|:---|:---|:---|:---|
| 2025-10-01 | $171689884914.24          | $172868817561.32           | 83.7800%                  | 84.3600%                   |
| 2025-10-02 | $166831524382.23          | $168010175903.10           | 83.3900%                  | 83.9800%                   |
| 2025-10-03 | $163431718826.60          | $164610498117.90           | 83.0900%                  | 83.6900%                   |
| 2025-10-06 | $164697160508.81          | $165876323124.59           | 83.2000%                  | 83.8000%                   |
| 2025-10-07 | $162387226317.48          | $163566395557.82           | 83.0000%                  | 83.6100%                   |
| 2025-10-08 | $164581720252.71          | $165960998489.61           | 83.1100%                  | 83.8100%                   |
| 2025-10-09 | $164503457523.65          | $165882841754.33           | 83.1000%                  | 83.8000%                   |
| 2025-10-10 | $160436549503.47          | $161816081255.71           | 82.6200%                  | 83.3300%                   |
| 2025-10-13 | $0.00                     | $0.00                      | 0.0000%                   | 0.0000%                    |
| 2025-10-14 | $164733780023.27          | $166113835138.19           | 82.9200%                  | 83.6200%                   |
| 2025-10-15 | $169021218772.63          | $170201537414.70           | 83.3700%                  | 83.9500%                   |
| 2025-10-16 | $165584699319.32          | $166765164732.11           | 83.0500%                  | 83.6400%                   |
| 2025-10-17 | $157818960140.15          | $158999489368.00           | 82.3300%                  | 82.9400%                   |
| 2025-10-20 | $160183659961.30          | $162214470772.63           | 82.5400%                  | 83.5900%                   |
| 2025-10-21 | $162767773741.41          | $164798814979.20           | 82.7800%                  | 83.8100%                   |
| 2025-10-22 | $163341890093.92          | $165738074494.80           | 82.8200%                  | 84.0400%                   |
| 2025-10-23 | $157284387484.74          | $159675641601.02           | 82.2800%                  | 83.5300%                   |
| 2025-10-24 | $151398960854.43          | $152940360779.52           | 82.0800%                  | 82.9200%                   |
| 2025-10-27 | $154270645083.00          | $155812518927.68           | 82.3100%                  | 83.1300%                   |
| 2025-10-28 | $149524064691.69          | $151066111081.90           | 81.7000%                  | 82.5400%                   |
| 2025-10-29 | $152475510508.59          | $153632772167.21           | 82.1500%                  | 82.7800%                   |
| 2025-10-30 | $151282222201.70          | $152439603130.25           | 82.0400%                  | 82.6700%                   |
| 2025-10-31 | $161864448852.11          | $163021819335.38           | 83.0600%                  | 83.6600%                   |

### 7-Day Gross Yield
| Date       | 7-Day Gross Yield   |
|:---|:---|
| 2025-10-01 | 4.2000%             |
| 2025-10-02 | 4.2000%             |
| 2025-10-03 | 4.1900%             |
| 2025-10-06 | 4.1900%             |
| 2025-10-07 | 4.1800%             |
| 2025-10-08 | 4.1700%             |
| 2025-10-09 | 4.1700%             |
| 2025-10-10 | 4.1600%             |
| 2025-10-13 | 0.0000%             |
| 2025-10-14 | 4.1600%             |
| 2025-10-15 | 4.1600%             |
| 2025-10-16 | 4.1700%             |
| 2025-10-17 | 4.1800%             |
| 2025-10-20 | 4.1800%             |
| 2025-10-21 | 4.1800%             |
| 2025-10-22 | 4.1800%             |
| 2025-10-23 | 4.1800%             |
| 2025-10-24 | 4.1700%             |
| 2025-10-27 | 4.1700%             |
| 2025-10-28 | 4.1700%             |
| 2025-10-29 | 4.1700%             |
| 2025-10-30 | 4.1700%             |
| 2025-10-31 | 4.1300%             |

### Daily Net Asset Value per Share (Series)
| Date       | Net Asset Value per Share   |
|:---|:---|
| 2025-10-01 | 1.0003                      |
|  |  |
| 2025-10-02 | 1.0003                      |
|  |  |
| 2025-10-03 | 1.0002                      |
|  |  |
| 2025-10-06 | 1.0002                      |
|  |  |
| 2025-10-07 | 1.0002                      |
|  |  |
| 2025-10-08 | 1.0002                      |
|  |  |
| 2025-10-09 | 1.0002                      |
|  |  |
| 2025-10-10 | 1.0002                      |
|  |  |
| 2025-10-13 | 0.0000                      |
|  |  |
| 2025-10-14 | 1.0002                      |
|  |  |
| 2025-10-15 | 1.0002                      |
|  |  |
| 2025-10-16 | 1.0002                      |
|  |  |
| 2025-10-17 | 1.0002                      |
|  |  |
| 2025-10-20 | 1.0002                      |
|  |  |
| 2025-10-21 | 1.0002                      |
|  |  |
| 2025-10-22 | 1.0002                      |
|  |  |
| 2025-10-23 | 1.0002                      |
|  |  |
| 2025-10-24 | 1.0002                      |
|  |  |
| 2025-10-27 | 1.0003                      |
|  |  |
| 2025-10-28 | 1.0003                      |
|  |  |
| 2025-10-29 | 1.0002                      |
|  |  |
| 2025-10-30 | 1.0002                      |
|  |  |
| 2025-10-31 | 1.0002                      |
|  |  |

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

### Class: Advantage Class

- **Minimum Initial Investment:** $1000000.00

- **Net Assets of Class:** $145651163.70

- **Number of Shares Outstanding:** 145650999.6200

- **Expense Reimbursement/Waiver:** 9087.00

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2025-10-01 | 1.0003          |
|  |  |
| 2025-10-02 | 1.0003          |
|  |  |
| 2025-10-03 | 1.0002          |
|  |  |
| 2025-10-06 | 1.0002          |
|  |  |
| 2025-10-07 | 1.0002          |
|  |  |
| 2025-10-08 | 1.0002          |
|  |  |
| 2025-10-09 | 1.0002          |
|  |  |
| 2025-10-10 | 1.0002          |
|  |  |
| 2025-10-13 | 0.0000          |
|  |  |
| 2025-10-14 | 1.0002          |
|  |  |
| 2025-10-15 | 1.0002          |
|  |  |
| 2025-10-16 | 1.0002          |
|  |  |
| 2025-10-17 | 1.0002          |
|  |  |
| 2025-10-20 | 1.0002          |
|  |  |
| 2025-10-21 | 1.0002          |
|  |  |
| 2025-10-22 | 1.0002          |
|  |  |
| 2025-10-23 | 1.0002          |
|  |  |
| 2025-10-24 | 1.0002          |
|  |  |
| 2025-10-27 | 1.0003          |
|  |  |
| 2025-10-28 | 1.0003          |
|  |  |
| 2025-10-29 | 1.0002          |
|  |  |
| 2025-10-30 | 1.0002          |
|  |  |
| 2025-10-31 | 1.0002          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2025-10-01 | $1163554.38               | $1418459.24             |
| 2025-10-02 | $1517458.85               | $604856.31              |
| 2025-10-03 | $3613262.27               | $1205256.60             |
| 2025-10-06 | $177969.54                | $50700.00               |
| 2025-10-07 | $1287068.33               | $214443.90              |
| 2025-10-08 | $351495.00                | $948283.38              |
| 2025-10-09 | $1386465.51               | $281989.46              |
| 2025-10-10 | $555435.00                | $148133.00              |
| 2025-10-13 | $0.00                     | $0.00                   |
| 2025-10-14 | $590833.33                | $3561310.34             |
| 2025-10-15 | $2777958.12               | $3757739.45             |
| 2025-10-16 | $1311900.00               | $286292.81              |
| 2025-10-17 | $904399.59                | $1068385.54             |
| 2025-10-20 | $629915.50                | $105814.05              |
| 2025-10-21 | $1617702.86               | $522036.72              |
| 2025-10-22 | $2591894.52               | $815845.08              |
| 2025-10-23 | $1160140.54               | $245115.56              |
| 2025-10-24 | $584586.57                | $437040.48              |
| 2025-10-27 | $813055.60                | $1501705.00             |
| 2025-10-28 | $1297332.68               | $297263.30              |
| 2025-10-29 | $1332208.00               | $481080.30              |
| 2025-10-30 | $1114800.00               | $628189.24              |
| 2025-10-31 | $632800.00                | $568195.30              |

**Total Gross Subscriptions (Month):** $27412236.19

**Total Gross Redemptions (Month):** $19148135.06

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2025-10-01 | 3.8100%           |
| 2025-10-02 | 3.8100%           |
| 2025-10-03 | 3.8000%           |
| 2025-10-06 | 3.8000%           |
| 2025-10-07 | 3.7900%           |
| 2025-10-08 | 3.7800%           |
| 2025-10-09 | 3.7800%           |
| 2025-10-10 | 3.7700%           |
| 2025-10-13 | 0.0000%           |
| 2025-10-14 | 3.7700%           |
| 2025-10-15 | 3.7700%           |
| 2025-10-16 | 3.7800%           |
| 2025-10-17 | 3.7900%           |
| 2025-10-20 | 3.7900%           |
| 2025-10-21 | 3.7900%           |
| 2025-10-22 | 3.7900%           |
| 2025-10-23 | 3.7900%           |
| 2025-10-24 | 3.7800%           |
| 2025-10-27 | 3.7800%           |
| 2025-10-28 | 3.7800%           |
| 2025-10-29 | 3.7800%           |
| 2025-10-30 | 3.7800%           |
| 2025-10-31 | 3.7400%           |

**Beneficial/Record Owner Categories**
| Category      | Other Category   | Record Owner %   | Beneficial Owner %   |
|:---|:---|:---|:---|
| Broker-dealer |  | 99.9300%         | 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):** $146249700.39
- **C.18.a - Value (excl. sponsor support):** $146249700.39
- **C.19 - Percentage of Net Assets:** 100.0000%
- **C.17 - Yield as of Reporting Date:** 0.0000%
- **C.11 - Maturity Date (WAM):** 2025-11-03
- **C.12 - Maturity Date (WAL):** 2025-11-03
- **C.13 - Final Legal Maturity Date:** 2025-11-03
- **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:** 2025-11-07

**By:** /s/ Chad Hallett

**Name of Signing Officer:** Chad Hallett

**Title of Signing Officer:** Deputy Treasurer