# EDGAR Filing Document

**Accession Number:** 0001107414
**File Stem:** 0001410368-25-013984
**Filing Date:** 2025-10
**Character Count:** 13372
**Document Hash:** 49fe92268ec847a93567a6d51a50d236
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001410368-25-013984.hdr.sgml**: 20251007

**ACCESSION NUMBER**: 0001410368-25-013984

**CONFORMED SUBMISSION TYPE**: N-MFP3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20250930

**FILED AS OF DATE**: 20251007

**DATE AS OF CHANGE**: 20251007

**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:** 251378650

**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):** 2025-09-30

**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:** $137894584.67

- **Amortized Cost of Portfolio Securities:** $137894584.67

- **Cash:** $0.00

- **Total Other Assets:** $0.00

- **Total Liabilities:** $507529.24

- **Net Assets of Series:** $137387055.43

- **Number of Shares Outstanding (Series):** 137386898.4900

- **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 (%)   |
|:---|:---|:---|:---|:---|
| 2025-09-02 | $141288515298.31          | $142063350562.31           | 83.2000%                  | 83.6600%                   |
| 2025-09-03 | $141672706917.21          | $142082546802.71           | 83.0000%                  | 83.2400%                   |
| 2025-09-04 | $146800620681.44          | $147210463764.69           | 82.9700%                  | 83.2000%                   |
| 2025-09-05 | $143214422419.32          | $144174268304.82           | 82.6000%                  | 83.1500%                   |
| 2025-09-08 | $149954739508.07          | $150529593799.82           | 83.4200%                  | 83.7400%                   |
| 2025-09-09 | $146932234178.70          | $147507091095.45           | 82.9600%                  | 83.2900%                   |
| 2025-09-10 | $150809834242.03          | $152104693964.28           | 82.6700%                  | 83.3800%                   |
| 2025-09-11 | $148368652000.65          | $149113514868.65           | 82.6900%                  | 83.1100%                   |
| 2025-09-12 | $145146018945.52          | $145890885612.27           | 82.1800%                  | 82.6000%                   |
| 2025-09-15 | $142910846183.10          | $143655720245.60           | 81.9500%                  | 82.3800%                   |
| 2025-09-16 | $141722011324.28          | $141746889102.03           | 81.9400%                  | 81.9600%                   |
| 2025-09-17 | $144634675484.56          | $144659557383.81           | 82.2400%                  | 82.2600%                   |
| 2025-09-18 | $151034398531.42          | $151059282302.17           | 82.8700%                  | 82.8800%                   |
| 2025-09-19 | $150745760500.77          | $150770646611.77           | 82.8400%                  | 82.8500%                   |
| 2025-09-22 | $156329526753.46          | $156799531597.96           | 83.2500%                  | 83.5000%                   |
| 2025-09-23 | $157072583947.77          | $157542636060.90           | 83.1200%                  | 83.3700%                   |
| 2025-09-24 | $160053463642.91          | $160523582441.07           | 83.3800%                  | 83.6200%                   |
| 2025-09-25 | $165975416113.58          | $166445586112.83           | 83.8700%                  | 84.1100%                   |
| 2025-09-26 | $168965743930.23          | $169800980636.54           | 84.1000%                  | 84.5100%                   |
| 2025-09-29 | $171960653148.87          | $173139010988.52           | 83.9900%                  | 84.5600%                   |
| 2025-09-30 | $168477066212.60          | $169655549670.59           | 83.7200%                  | 84.3100%                   |

### 7-Day Gross Yield
| Date       | 7-Day Gross Yield   |
|:---|:---|
| 2025-09-02 | 4.3400%             |
| 2025-09-03 | 4.3400%             |
| 2025-09-04 | 4.3400%             |
| 2025-09-05 | 4.3400%             |
| 2025-09-08 | 4.3400%             |
| 2025-09-09 | 4.3400%             |
| 2025-09-10 | 4.3300%             |
| 2025-09-11 | 4.3300%             |
| 2025-09-12 | 4.3200%             |
| 2025-09-15 | 4.3200%             |
| 2025-09-16 | 4.3200%             |
| 2025-09-17 | 4.3200%             |
| 2025-09-18 | 4.3100%             |
| 2025-09-19 | 4.2500%             |
| 2025-09-22 | 4.2300%             |
| 2025-09-23 | 4.2100%             |
| 2025-09-24 | 4.2000%             |
| 2025-09-25 | 4.1900%             |
| 2025-09-26 | 4.2000%             |
| 2025-09-29 | 4.2000%             |
| 2025-09-30 | 4.2000%             |

### Daily Net Asset Value per Share (Series)
| Date       | Net Asset Value per Share   |
|:---|:---|
| 2025-09-02 | 1.0002                      |
|  |  |
| 2025-09-03 | 1.0002                      |
|  |  |
| 2025-09-04 | 1.0003                      |
|  |  |
| 2025-09-05 | 1.0004                      |
|  |  |
| 2025-09-08 | 1.0003                      |
|  |  |
| 2025-09-09 | 1.0003                      |
|  |  |
| 2025-09-10 | 1.0003                      |
|  |  |
| 2025-09-11 | 1.0003                      |
|  |  |
| 2025-09-12 | 1.0003                      |
|  |  |
| 2025-09-15 | 1.0003                      |
|  |  |
| 2025-09-16 | 1.0003                      |
|  |  |
| 2025-09-17 | 1.0004                      |
|  |  |
| 2025-09-18 | 1.0003                      |
|  |  |
| 2025-09-19 | 1.0003                      |
|  |  |
| 2025-09-22 | 1.0003                      |
|  |  |
| 2025-09-23 | 1.0003                      |
|  |  |
| 2025-09-24 | 1.0003                      |
|  |  |
| 2025-09-25 | 1.0002                      |
|  |  |
| 2025-09-26 | 1.0002                      |
|  |  |
| 2025-09-29 | 1.0002                      |
|  |  |
| 2025-09-30 | 1.0002                      |
|  |  |

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

### Class: Advantage Class

- **Minimum Initial Investment:** $1000000.00

- **Net Assets of Class:** $137387055.43

- **Number of Shares Outstanding:** 137386898.4900

- **Expense Reimbursement/Waiver:** 7580.00

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2025-09-02 | 1.0002          |
|  |  |
| 2025-09-03 | 1.0002          |
|  |  |
| 2025-09-04 | 1.0003          |
|  |  |
| 2025-09-05 | 1.0004          |
|  |  |
| 2025-09-08 | 1.0003          |
|  |  |
| 2025-09-09 | 1.0003          |
|  |  |
| 2025-09-10 | 1.0003          |
|  |  |
| 2025-09-11 | 1.0003          |
|  |  |
| 2025-09-12 | 1.0003          |
|  |  |
| 2025-09-15 | 1.0003          |
|  |  |
| 2025-09-16 | 1.0003          |
|  |  |
| 2025-09-17 | 1.0004          |
|  |  |
| 2025-09-18 | 1.0003          |
|  |  |
| 2025-09-19 | 1.0003          |
|  |  |
| 2025-09-22 | 1.0003          |
|  |  |
| 2025-09-23 | 1.0003          |
|  |  |
| 2025-09-24 | 1.0003          |
|  |  |
| 2025-09-25 | 1.0002          |
|  |  |
| 2025-09-26 | 1.0002          |
|  |  |
| 2025-09-29 | 1.0002          |
|  |  |
| 2025-09-30 | 1.0002          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2025-09-02 | $1379343.15               | $4493084.16             |
| 2025-09-03 | $419138.33                | $730746.94              |
| 2025-09-04 | $1009672.96               | $100000.00              |
| 2025-09-05 | $946760.05                | $782239.90              |
| 2025-09-08 | $1901579.98               | $243878.00              |
| 2025-09-09 | $1529222.74               | $202109.35              |
| 2025-09-10 | $1457463.82               | $1424957.11             |
| 2025-09-11 | $1555703.73               | $511472.93              |
| 2025-09-12 | $985680.40                | $132949.06              |
| 2025-09-15 | $893901.78                | $45000.00               |
| 2025-09-16 | $3907144.31               | $853117.18              |
| 2025-09-17 | $961497.06                | $580158.60              |
| 2025-09-18 | $2281685.68               | $572100.00              |
| 2025-09-19 | $552750.00                | $343513.86              |
| 2025-09-22 | $2175090.00               | $694617.39              |
| 2025-09-23 | $242661.70                | $1287055.84             |
| 2025-09-24 | $1106980.49               | $112000.00              |
| 2025-09-25 | $431339.36                | $3145288.60             |
| 2025-09-26 | $1023582.47               | $558000.00              |
| 2025-09-29 | $901800.00                | $274949.33              |
| 2025-09-30 | $500600.00                | $215205.16              |

**Total Gross Subscriptions (Month):** $26163598.01

**Total Gross Redemptions (Month):** $17302443.41

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2025-09-02 | 3.9500%           |
| 2025-09-03 | 3.9500%           |
| 2025-09-04 | 3.9500%           |
| 2025-09-05 | 3.9500%           |
| 2025-09-08 | 3.9500%           |
| 2025-09-09 | 3.9500%           |
| 2025-09-10 | 3.9400%           |
| 2025-09-11 | 3.9400%           |
| 2025-09-12 | 3.9300%           |
| 2025-09-15 | 3.9300%           |
| 2025-09-16 | 3.9300%           |
| 2025-09-17 | 3.9300%           |
| 2025-09-18 | 3.9200%           |
| 2025-09-19 | 3.8600%           |
| 2025-09-22 | 3.8400%           |
| 2025-09-23 | 3.8200%           |
| 2025-09-24 | 3.8100%           |
| 2025-09-25 | 3.8000%           |
| 2025-09-26 | 3.8100%           |
| 2025-09-29 | 3.8100%           |
| 2025-09-30 | 3.8100%           |

**Beneficial/Record Owner Categories**
| Category      | Other Category   | Record Owner %   | Beneficial Owner %   |
|:---|:---|:---|:---|
| Broker-dealer |  | 99.9200%         | 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):** $137894584.67
- **C.18.a - Value (excl. sponsor support):** $137894584.67
- **C.19 - Percentage of Net Assets:** 100.0000%
- **C.17 - Yield as of Reporting Date:** 0.0000%
- **C.11 - Maturity Date (WAM):** 2025-10-01
- **C.12 - Maturity Date (WAL):** 2025-10-01
- **C.13 - Final Legal Maturity Date:** 2025-10-01
- **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:** 2025-10-07

**By:** /s/ Chad Hallett

**Name of Signing Officer:** Chad Hallett

**Title of Signing Officer:** Deputy Treasurer