# EDGAR Filing Document

**Accession Number:** 0001107414
**File Stem:** 0001145549-25-050731
**Filing Date:** 2025-8
**Character Count:** 13728
**Document Hash:** e788c48a81144ecb31369a775ce1cb2c
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001145549-25-050731.hdr.sgml**: 20250807

**ACCESSION NUMBER**: 0001145549-25-050731

**CONFORMED SUBMISSION TYPE**: N-MFP3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20250731

**FILED AS OF DATE**: 20250807

**DATE AS OF CHANGE**: 20250807

**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:** 251192250

**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):** 2025-07-31

**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:** $118923579.83

- **Amortized Cost of Portfolio Securities:** $118923579.83

- **Cash:** $0.00

- **Total Other Assets:** $0.00

- **Total Liabilities:** $469042.50

- **Net Assets of Series:** $118454537.33

- **Number of Shares Outstanding (Series):** 118454403.0600

- **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 (%)   |
|:---|:---|:---|:---|:---|
| 2025-07-01 | $150982371158.72          | $151426286673.43           | 84.5800%                  | 84.8300%                   |
| 2025-07-02 | $149967997011.93          | $150411964401.66           | 84.5000%                  | 84.7500%                   |
| 2025-07-03 | $137705865695.45          | $138534884960.20           | 83.3300%                  | 83.8300%                   |
| 2025-07-07 | $140171514262.92          | $141679187039.88           | 83.5800%                  | 84.4800%                   |
| 2025-07-08 | $141310274898.52          | $142817994408.23           | 83.6900%                  | 84.5800%                   |
| 2025-07-09 | $144868956401.64          | $146376746493.58           | 84.0300%                  | 84.9000%                   |
| 2025-07-10 | $142347104057.03          | $143469930014.71           | 83.9800%                  | 84.6400%                   |
| 2025-07-11 | $144755361836.53          | $145199777971.25           | 84.5200%                  | 84.7800%                   |
| 2025-07-14 | $144909225307.03          | $145353823137.64           | 84.5400%                  | 84.8000%                   |
| 2025-07-15 | $145667610856.58          | $146112233672.18           | 84.6100%                  | 84.8700%                   |
| 2025-07-16 | $143242481548.81          | $144052157168.28           | 84.3900%                  | 84.8700%                   |
| 2025-07-17 | $140982285957.30          | $141427014378.85           | 84.1800%                  | 84.4500%                   |
| 2025-07-18 | $136394451910.00          | $136839233133.63           | 83.7200%                  | 83.9900%                   |
| 2025-07-21 | $143528433814.41          | $143973382360.98           | 84.4100%                  | 84.6700%                   |
| 2025-07-22 | $144113262669.95          | $144558256765.25           | 84.4600%                  | 84.7300%                   |
| 2025-07-23 | $146707416439.41          | $147152469355.55           | 84.7000%                  | 84.9500%                   |
| 2025-07-24 | $146336877336.22          | $146781976083.66           | 84.6600%                  | 84.9200%                   |
| 2025-07-25 | $144403638454.29          | $145548795738.21           | 84.4800%                  | 85.1500%                   |
| 2025-07-28 | $146230863930.47          | $147376173643.77           | 84.6500%                  | 85.3100%                   |
| 2025-07-29 | $143050482769.94          | $144195845224.70           | 84.3700%                  | 85.0400%                   |
| 2025-07-30 | $143570902723.01          | $144716317917.45           | 84.4100%                  | 85.0900%                   |
| 2025-07-31 | $145582945251.50          | $146028414277.60           | 84.9900%                  | 85.2500%                   |

### 7-Day Gross Yield
| Date       | 7-Day Gross Yield   |
|:---|:---|
| 2025-07-01 | 4.3900%             |
| 2025-07-02 | 4.3900%             |
| 2025-07-03 | 4.3700%             |
| 2025-07-07 | 4.3700%             |
| 2025-07-08 | 4.3600%             |
| 2025-07-09 | 4.3600%             |
| 2025-07-10 | 4.3600%             |
| 2025-07-11 | 4.3500%             |
| 2025-07-14 | 4.3500%             |
| 2025-07-15 | 4.3500%             |
| 2025-07-16 | 4.3600%             |
| 2025-07-17 | 4.3600%             |
| 2025-07-18 | 4.3600%             |
| 2025-07-21 | 4.3500%             |
| 2025-07-22 | 4.3500%             |
| 2025-07-23 | 4.3400%             |
| 2025-07-24 | 4.3400%             |
| 2025-07-25 | 4.3500%             |
| 2025-07-28 | 4.3500%             |
| 2025-07-29 | 4.3600%             |
| 2025-07-30 | 4.3600%             |
| 2025-07-31 | 4.3600%             |

### Daily Net Asset Value per Share (Series)
| Date       | Net Asset Value per Share   |
|:---|:---|
| 2025-07-01 | 1.0001                      |
|  |  |
| 2025-07-02 | 1.0001                      |
|  |  |
| 2025-07-03 | 1.0000                      |
|  |  |
| 2025-07-07 | 1.0000                      |
|  |  |
| 2025-07-08 | 1.0000                      |
|  |  |
| 2025-07-09 | 1.0000                      |
|  |  |
| 2025-07-10 | 1.0000                      |
|  |  |
| 2025-07-11 | 1.0000                      |
|  |  |
| 2025-07-14 | 1.0000                      |
|  |  |
| 2025-07-15 | 1.0000                      |
|  |  |
| 2025-07-16 | 1.0000                      |
|  |  |
| 2025-07-17 | 1.0000                      |
|  |  |
| 2025-07-18 | 1.0000                      |
|  |  |
| 2025-07-21 | 1.0000                      |
|  |  |
| 2025-07-22 | 1.0000                      |
|  |  |
| 2025-07-23 | 1.0000                      |
|  |  |
| 2025-07-24 | 1.0000                      |
|  |  |
| 2025-07-25 | 1.0000                      |
|  |  |
| 2025-07-28 | 1.0000                      |
|  |  |
| 2025-07-29 | 1.0001                      |
|  |  |
| 2025-07-30 | 1.0000                      |
|  |  |
| 2025-07-31 | 1.0000                      |
|  |  |

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

### Class: Advantage Class

- **Minimum Initial Investment:** $1000000.00

- **Net Assets of Class:** $118454537.33

- **Number of Shares Outstanding:** 118454403.0600

- **Expense Reimbursement/Waiver:** 7330.67

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2025-07-01 | 1.0001          |
|  |  |
| 2025-07-02 | 1.0001          |
|  |  |
| 2025-07-03 | 1.0000          |
|  |  |
| 2025-07-07 | 1.0000          |
|  |  |
| 2025-07-08 | 1.0000          |
|  |  |
| 2025-07-09 | 1.0000          |
|  |  |
| 2025-07-10 | 1.0000          |
|  |  |
| 2025-07-11 | 1.0000          |
|  |  |
| 2025-07-14 | 1.0000          |
|  |  |
| 2025-07-15 | 1.0000          |
|  |  |
| 2025-07-16 | 1.0000          |
|  |  |
| 2025-07-17 | 1.0000          |
|  |  |
| 2025-07-18 | 1.0000          |
|  |  |
| 2025-07-21 | 1.0000          |
|  |  |
| 2025-07-22 | 1.0000          |
|  |  |
| 2025-07-23 | 1.0000          |
|  |  |
| 2025-07-24 | 1.0000          |
|  |  |
| 2025-07-25 | 1.0000          |
|  |  |
| 2025-07-28 | 1.0000          |
|  |  |
| 2025-07-29 | 1.0001          |
|  |  |
| 2025-07-30 | 1.0000          |
|  |  |
| 2025-07-31 | 1.0000          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2025-07-01 | $957294.36                | $79105.86               |
| 2025-07-02 | $1073460.05               | $238055.40              |
| 2025-07-03 | $360365.51                | $386465.00              |
| 2025-07-07 | $944848.00                | $30000.00               |
| 2025-07-08 | $1299555.10               | $1145058.96             |
| 2025-07-09 | $555000.00                | $728828.56              |
| 2025-07-10 | $729896.67                | $348170.54              |
| 2025-07-11 | $877500.00                | $31500.00               |
| 2025-07-14 | $1942630.14               | $195402.82              |
| 2025-07-15 | $644349.19                | $278749.76              |
| 2025-07-16 | $601234.08                | $1122911.61             |
| 2025-07-17 | $319455.00                | $1547800.64             |
| 2025-07-18 | $696550.00                | $252193.28              |
| 2025-07-21 | $732895.21                | $428871.54              |
| 2025-07-22 | $644300.33                | $605119.51              |
| 2025-07-23 | $629400.00                | $135526.84              |
| 2025-07-24 | $786376.00                | $235500.00              |
| 2025-07-25 | $283800.00                | $2115666.25             |
| 2025-07-28 | $524139.22                | $139209.44              |
| 2025-07-29 | $691099.14                | $85651.33               |
| 2025-07-30 | $723886.69                | $472072.65              |
| 2025-07-31 | $942095.71                | $72500.00               |

**Total Gross Subscriptions (Month):** $16960130.40

**Total Gross Redemptions (Month):** $10674359.99

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2025-07-01 | 3.9900%           |
| 2025-07-02 | 4.0000%           |
| 2025-07-03 | 3.9800%           |
| 2025-07-07 | 3.9800%           |
| 2025-07-08 | 3.9700%           |
| 2025-07-09 | 3.9700%           |
| 2025-07-10 | 3.9700%           |
| 2025-07-11 | 3.9600%           |
| 2025-07-14 | 3.9600%           |
| 2025-07-15 | 3.9600%           |
| 2025-07-16 | 3.9700%           |
| 2025-07-17 | 3.9700%           |
| 2025-07-18 | 3.9700%           |
| 2025-07-21 | 3.9600%           |
| 2025-07-22 | 3.9600%           |
| 2025-07-23 | 3.9500%           |
| 2025-07-24 | 3.9500%           |
| 2025-07-25 | 3.9600%           |
| 2025-07-28 | 3.9600%           |
| 2025-07-29 | 3.9700%           |
| 2025-07-30 | 3.9700%           |
| 2025-07-31 | 3.9700%           |

**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):** $118923579.83
- **C.18.a - Value (excl. sponsor support):** $118923579.83
- **C.19 - Percentage of Net Assets:** 100.0000%
- **C.17 - Yield as of Reporting Date:** 0.0000%
- **C.11 - Maturity Date (WAM):** 2025-08-01
- **C.12 - Maturity Date (WAL):** 2025-08-01
- **C.13 - Final Legal Maturity Date:** 2025-08-01
- **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:** 2025-08-07

**By:** /s/ Chad Hallett

**Name of Signing Officer:** Chad Hallett

**Title of Signing Officer:** Deputy Treasurer