# EDGAR Filing Document

**Accession Number:** 0001107414
**File Stem:** 0001410368-25-033479
**Filing Date:** 2025-12
**Character Count:** 12625
**Document Hash:** b88934b330f1ac3cd35d128e0d1c7e05
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001410368-25-033479.hdr.sgml**: 20251205

**ACCESSION NUMBER**: 0001410368-25-033479

**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:** 251551831

**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 Treasury Money Market Fund (Series ID: S000086381)

| Class ID   | Class Name      | Ticker Symbol   |
|:---|:---|:---|
| C000251884 | Advantage Class | AFTXX           |

# 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 Treasury Money Market Fund

**LEI of Series:** 984500C54F6C789ECD10

**EDGAR Series Identifier:** S000086381

**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:** $110907511.41

- **Amortized Cost of Portfolio Securities:** $110907511.41

- **Cash:** $0.00

- **Total Other Assets:** $0.00

- **Total Liabilities:** $403773.73

- **Net Assets of Series:** $110503737.68

- **Number of Shares Outstanding (Series):** 110503239.4400

- **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 | $14522838376.80           | $14522838376.80            | 99.9700%                  | 99.9700%                   |
| 2025-11-04 | $14590065724.45           | $14590065724.45            | 99.9700%                  | 99.9700%                   |
| 2025-11-05 | $14640754239.00           | $14640754239.00            | 99.9700%                  | 99.9700%                   |
| 2025-11-06 | $14226072486.67           | $14226072486.67            | 99.9600%                  | 99.9600%                   |
| 2025-11-07 | $14100514405.11           | $14100514405.11            | 99.9600%                  | 99.9600%                   |
| 2025-11-10 | $14906254726.07           | $14906254726.07            | 99.9500%                  | 99.9500%                   |
| 2025-11-11 | $0.00                     | $0.00                      | 0.0000%                   | 0.0000%                    |
| 2025-11-12 | $14713462113.43           | $14713462113.43            | 99.9500%                  | 99.9500%                   |
| 2025-11-13 | $14333836468.03           | $14333836468.03            | 99.9500%                  | 99.9500%                   |
| 2025-11-14 | $14337002751.79           | $14337002751.79            | 99.9400%                  | 99.9400%                   |
| 2025-11-17 | $14535284166.86           | $14535284166.86            | 99.9400%                  | 99.9400%                   |
| 2025-11-18 | $14585049818.97           | $14585049818.97            | 99.9400%                  | 99.9400%                   |
| 2025-11-19 | $15134269342.32           | $15134269342.32            | 99.9400%                  | 99.9400%                   |
| 2025-11-20 | $14866176283.55           | $14866176283.55            | 99.9300%                  | 99.9300%                   |
| 2025-11-21 | $15314643190.29           | $15314643190.29            | 99.9300%                  | 99.9300%                   |
| 2025-11-24 | $15193976243.17           | $15193976243.17            | 99.9300%                  | 99.9300%                   |
| 2025-11-25 | $15132227261.55           | $15132227261.55            | 99.9200%                  | 99.9200%                   |
| 2025-11-26 | $16494680492.88           | $16494680492.88            | 99.9300%                  | 99.9300%                   |
| 2025-11-28 | $15765740262.50           | $15765740262.50            | 99.9200%                  | 99.9200%                   |

### 7-Day Gross Yield
| Date       | 7-Day Gross Yield   |
|:---|:---|
| 2025-11-03 | 4.0400%             |
| 2025-11-04 | 4.0400%             |
| 2025-11-05 | 4.0300%             |
| 2025-11-06 | 4.0300%             |
| 2025-11-07 | 4.0200%             |
| 2025-11-10 | 4.0200%             |
| 2025-11-11 | 0.0000%             |
| 2025-11-12 | 4.0200%             |
| 2025-11-13 | 4.0200%             |
| 2025-11-14 | 4.0100%             |
| 2025-11-17 | 4.0100%             |
| 2025-11-18 | 4.0100%             |
| 2025-11-19 | 4.0100%             |
| 2025-11-20 | 4.0100%             |
| 2025-11-21 | 4.0000%             |
| 2025-11-24 | 4.0000%             |
| 2025-11-25 | 4.0000%             |
| 2025-11-26 | 4.0000%             |
| 2025-11-28 | 3.9900%             |

### Daily Net Asset Value per Share (Series)
| Date       | Net Asset Value per Share   |
|:---|:---|
| 2025-11-03 | 1.0001                      |
|  |  |
| 2025-11-04 | 1.0001                      |
|  |  |
| 2025-11-05 | 1.0001                      |
|  |  |
| 2025-11-06 | 1.0002                      |
|  |  |
| 2025-11-07 | 1.0002                      |
|  |  |
| 2025-11-10 | 1.0001                      |
|  |  |
| 2025-11-11 | 0.0000                      |
|  |  |
| 2025-11-12 | 1.0001                      |
|  |  |
| 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 | 1.0001                      |
|  |  |
| 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:** $110503737.68

- **Number of Shares Outstanding:** 110503239.4400

- **Expense Reimbursement/Waiver:** 6099.00

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2025-11-03 | 1.0001          |
|  |  |
| 2025-11-04 | 1.0001          |
|  |  |
| 2025-11-05 | 1.0001          |
|  |  |
| 2025-11-06 | 1.0002          |
|  |  |
| 2025-11-07 | 1.0002          |
|  |  |
| 2025-11-10 | 1.0001          |
|  |  |
| 2025-11-11 | 0.0000          |
|  |  |
| 2025-11-12 | 1.0001          |
|  |  |
| 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 | 1.0001          |
|  |  |
| 2025-11-26 | 1.0001          |
|  |  |
| 2025-11-28 | 1.0001          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2025-11-03 | $2487786.43               | $197503.82              |
| 2025-11-04 | $1473388.92               | $250980.79              |
| 2025-11-05 | $150500.00                | $736889.64              |
| 2025-11-06 | $505993.93                | $333880.35              |
| 2025-11-07 | $1050040.80               | $1280188.46             |
| 2025-11-10 | $121890.00                | $964035.20              |
| 2025-11-11 | $0.00                     | $0.00                   |
| 2025-11-12 | $1136034.54               | $310764.68              |
| 2025-11-13 | $1038216.34               | $360088.65              |
| 2025-11-14 | $296113.42                | $30000.00               |
| 2025-11-17 | $901210.58                | $84783.06               |
| 2025-11-18 | $1139925.55               | $829811.02              |
| 2025-11-19 | $2548523.22               | $103700.00              |
| 2025-11-20 | $1109193.74               | $1077000.00             |
| 2025-11-21 | $1345860.65               | $247905.17              |
| 2025-11-24 | $1148529.54               | $193980.41              |
| 2025-11-25 | $1486149.61               | $624332.46              |
| 2025-11-26 | $817500.00                | $284824.40              |
| 2025-11-28 | $803513.81                | $68310.81               |

**Total Gross Subscriptions (Month):** $19560371.08

**Total Gross Redemptions (Month):** $7978978.92

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2025-11-03 | 3.6500%           |
| 2025-11-04 | 3.6500%           |
| 2025-11-05 | 3.6400%           |
| 2025-11-06 | 3.6400%           |
| 2025-11-07 | 3.6400%           |
| 2025-11-10 | 3.6300%           |
| 2025-11-11 | 0.0000%           |
| 2025-11-12 | 3.6300%           |
| 2025-11-13 | 3.6300%           |
| 2025-11-14 | 3.6200%           |
| 2025-11-17 | 3.6200%           |
| 2025-11-18 | 3.6200%           |
| 2025-11-19 | 3.6200%           |
| 2025-11-20 | 3.6200%           |
| 2025-11-21 | 3.6100%           |
| 2025-11-24 | 3.6100%           |
| 2025-11-25 | 3.6100%           |
| 2025-11-26 | 3.6100%           |
| 2025-11-28 | 3.6000%           |

**Beneficial/Record Owner Categories**
| Category      | Other Category   | Record Owner %   | Beneficial Owner %   |
|:---|:---|:---|:---|
| Broker-dealer |  | 99.9000%         | 0.0000%              |

## Part C: Schedule of Portfolio Securities

### Security 1: State Street Treasury Money Market Portfolio

- **C.1 - Title:** State Street Treasury Money Market Portfolio
- **C.6 - Investment Category:** Investment Company
- **Identifiers:** C.3 - CUSIP: FSSgAK1AX, C.3 - LEI: N/A, C.5 - Other ID: FSSgAK1AX
- **C.18 - Value (incl. sponsor support):** $110907511.41
- **C.18.a - Value (excl. sponsor support):** $110907511.41
- **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