# EDGAR Filing Document

**Accession Number:** 0001107414
**File Stem:** 0001410368-25-033484
**Filing Date:** 2025-12
**Character Count:** 12644
**Document Hash:** 0c028af1dcb3b8cd1969d74d237c1a03
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001410368-25-033484.hdr.sgml**: 20251205

**ACCESSION NUMBER**: 0001410368-25-033484

**CONFORMED SUBMISSION TYPE**: N-MFP3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20251130

**FILED AS OF DATE**: 20251205

**DATE AS OF CHANGE**: 20251205

**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:** 251551834

**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):** 2025-11-30

**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:** $155514072.61

- **Amortized Cost of Portfolio Securities:** $155514072.61

- **Cash:** $0.00

- **Total Other Assets:** $0.00

- **Total Liabilities:** $591232.02

- **Net Assets of Series:** $154922840.59

- **Number of Shares Outstanding (Series):** 154922678.7400

- **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 (%)   |
|:---|:---|:---|:---|:---|
| 2025-11-03 | $159294204665.11          | $160898517127.91           | 82.6000%                  | 83.4300%                   |
| 2025-11-04 | $158918458188.65          | $160522853477.88           | 82.4100%                  | 83.2400%                   |
| 2025-11-05 | $162006566680.22          | $163611237876.89           | 82.6800%                  | 83.5000%                   |
| 2025-11-06 | $175062423943.24          | $176667286298.77           | 83.7500%                  | 84.5200%                   |
| 2025-11-07 | $169529306410.22          | $171134306638.45           | 83.3000%                  | 84.0900%                   |
| 2025-11-10 | $173424089542.85          | $175442694124.81           | 83.6100%                  | 84.5800%                   |
| 2025-11-11 | $0.00                     | $0.00                      | 0.0000%                   | 0.0000%                    |
| 2025-11-12 | $181988437536.12          | $184007372991.91           | 84.2600%                  | 85.1900%                   |
| 2025-11-13 | $175869738540.49          | $177888794835.95           | 83.8000%                  | 84.7600%                   |
| 2025-11-14 | $173687598275.43          | $175706869808.53           | 83.4200%                  | 84.3900%                   |
| 2025-11-17 | $171667524236.19          | $174052435655.13           | 82.9500%                  | 84.1100%                   |
| 2025-11-18 | $172788527086.97          | $174822766085.78           | 83.0000%                  | 83.9700%                   |
| 2025-11-19 | $171741827568.18          | $173776306632.70           | 82.9100%                  | 83.8900%                   |
| 2025-11-20 | $182581306609.83          | $184528027362.89           | 83.9300%                  | 84.8300%                   |
| 2025-11-21 | $182926226518.63          | $184873161122.57           | 83.8500%                  | 84.7400%                   |
| 2025-11-24 | $183696087864.55          | $185629477130.25           | 83.9100%                  | 84.8000%                   |
| 2025-11-25 | $186868188260.84          | $189216291491.75           | 84.1800%                  | 85.2300%                   |
| 2025-11-26 | $188287495817.30          | $189648892043.08           | 84.6400%                  | 85.2500%                   |
| 2025-11-28 | $188630896695.14          | $190126466244.99           | 84.5200%                  | 85.1900%                   |

### 7-Day Gross Yield
| Date       | 7-Day Gross Yield   |
|:---|:---|
| 2025-11-03 | 4.1200%             |
| 2025-11-04 | 4.1000%             |
| 2025-11-05 | 4.0800%             |
| 2025-11-06 | 4.0700%             |
| 2025-11-07 | 4.0400%             |
| 2025-11-10 | 4.0300%             |
| 2025-11-11 | 0.0000%             |
| 2025-11-12 | 4.0300%             |
| 2025-11-13 | 4.0300%             |
| 2025-11-14 | 4.0400%             |
| 2025-11-17 | 4.0400%             |
| 2025-11-18 | 4.0400%             |
| 2025-11-19 | 4.0400%             |
| 2025-11-20 | 4.0300%             |
| 2025-11-21 | 4.0200%             |
| 2025-11-24 | 4.0100%             |
| 2025-11-25 | 4.0100%             |
| 2025-11-26 | 4.0300%             |
| 2025-11-28 | 4.0500%             |

### Daily Net Asset Value per Share (Series)
| Date       | Net Asset Value per Share   |
|:---|:---|
| 2025-11-03 | 1.0002                      |
|  |  |
| 2025-11-04 | 1.0002                      |
|  |  |
| 2025-11-05 | 1.0002                      |
|  |  |
| 2025-11-06 | 1.0002                      |
|  |  |
| 2025-11-07 | 1.0002                      |
|  |  |
| 2025-11-10 | 1.0001                      |
|  |  |
| 2025-11-11 | 0.0000                      |
|  |  |
| 2025-11-12 | 1.0002                      |
|  |  |
| 2025-11-13 | 1.0001                      |
|  |  |
| 2025-11-14 | 1.0001                      |
|  |  |
| 2025-11-17 | 1.0001                      |
|  |  |
| 2025-11-18 | 1.0001                      |
|  |  |
| 2025-11-19 | 1.0001                      |
|  |  |
| 2025-11-20 | 1.0001                      |
|  |  |
| 2025-11-21 | 1.0001                      |
|  |  |
| 2025-11-24 | 1.0001                      |
|  |  |
| 2025-11-25 | 1.0002                      |
|  |  |
| 2025-11-26 | 1.0001                      |
|  |  |
| 2025-11-28 | 1.0001                      |
|  |  |

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

### Class: Advantage Class

- **Minimum Initial Investment:** $1000000.00

- **Net Assets of Class:** $154922840.59

- **Number of Shares Outstanding:** 154922678.7400

- **Expense Reimbursement/Waiver:** 8014.00

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2025-11-03 | 1.0002          |
|  |  |
| 2025-11-04 | 1.0002          |
|  |  |
| 2025-11-05 | 1.0002          |
|  |  |
| 2025-11-06 | 1.0002          |
|  |  |
| 2025-11-07 | 1.0002          |
|  |  |
| 2025-11-10 | 1.0001          |
|  |  |
| 2025-11-11 | 0.0000          |
|  |  |
| 2025-11-12 | 1.0002          |
|  |  |
| 2025-11-13 | 1.0001          |
|  |  |
| 2025-11-14 | 1.0001          |
|  |  |
| 2025-11-17 | 1.0001          |
|  |  |
| 2025-11-18 | 1.0001          |
|  |  |
| 2025-11-19 | 1.0001          |
|  |  |
| 2025-11-20 | 1.0001          |
|  |  |
| 2025-11-21 | 1.0001          |
|  |  |
| 2025-11-24 | 1.0001          |
|  |  |
| 2025-11-25 | 1.0002          |
|  |  |
| 2025-11-26 | 1.0001          |
|  |  |
| 2025-11-28 | 1.0001          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2025-11-03 | $1211531.33               | $640041.68              |
| 2025-11-04 | $428188.25                | $728312.07              |
| 2025-11-05 | $916140.00                | $3600367.29             |
| 2025-11-06 | $636625.55                | $410910.01              |
| 2025-11-07 | $1202066.10               | $1093053.86             |
| 2025-11-10 | $1515023.50               | $73001.91               |
| 2025-11-11 | $0.00                     | $0.00                   |
| 2025-11-12 | $1301015.88               | $2503077.54             |
| 2025-11-13 | $1070445.00               | $210000.07              |
| 2025-11-14 | $542405.00                | $405203.42              |
| 2025-11-17 | $7918533.58               | $268960.00              |
| 2025-11-18 | $699975.36                | $310707.69              |
| 2025-11-19 | $1496201.22               | $783184.09              |
| 2025-11-20 | $1768996.00               | $403022.07              |
| 2025-11-21 | $1606445.00               | $2380116.05             |
| 2025-11-24 | $793726.80                | $720601.35              |
| 2025-11-25 | $1025300.00               | $599348.40              |
| 2025-11-26 | $1229000.00               | $893896.89              |
| 2025-11-28 | $185491.35                | $251626.41              |

**Total Gross Subscriptions (Month):** $25547109.92

**Total Gross Redemptions (Month):** $16275430.80

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2025-11-03 | 3.7300%           |
| 2025-11-04 | 3.7100%           |
| 2025-11-05 | 3.6900%           |
| 2025-11-06 | 3.6800%           |
| 2025-11-07 | 3.6500%           |
| 2025-11-10 | 3.6400%           |
| 2025-11-11 | 0.0000%           |
| 2025-11-12 | 3.6400%           |
| 2025-11-13 | 3.6400%           |
| 2025-11-14 | 3.6500%           |
| 2025-11-17 | 3.6500%           |
| 2025-11-18 | 3.6500%           |
| 2025-11-19 | 3.6500%           |
| 2025-11-20 | 3.6400%           |
| 2025-11-21 | 3.6300%           |
| 2025-11-24 | 3.6200%           |
| 2025-11-25 | 3.6200%           |
| 2025-11-26 | 3.6400%           |
| 2025-11-28 | 3.6600%           |

**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):** $155514072.61
- **C.18.a - Value (excl. sponsor support):** $155514072.61
- **C.19 - Percentage of Net Assets:** 100.0000%
- **C.17 - Yield as of Reporting Date:** 0.0000%
- **C.11 - Maturity Date (WAM):** 2025-12-01
- **C.12 - Maturity Date (WAL):** 2025-12-01
- **C.13 - Final Legal Maturity Date:** 2025-12-01
- **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:** 2025-12-05

**By:** /s/ Chad Hallett

**Name of Signing Officer:** Chad Hallett

**Title of Signing Officer:** Deputy Treasurer