# EDGAR Filing Document

**Accession Number:** 0001107414
**File Stem:** 0001145549-25-038748
**Filing Date:** 2025-6
**Character Count:** 13355
**Document Hash:** 9e46840862a9d32c8bc34eb93a9216fb
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001145549-25-038748.hdr.sgml**: 20250606

**ACCESSION NUMBER**: 0001145549-25-038748

**CONFORMED SUBMISSION TYPE**: N-MFP3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20250531

**FILED AS OF DATE**: 20250606

**DATE AS OF CHANGE**: 20250606

**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:** 251029158

**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):** 2025-05-31

**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:** $89182302.87

- **Amortized Cost of Portfolio Securities:** $89182302.87

- **Cash:** $0.00

- **Total Other Assets:** $0.00

- **Total Liabilities:** $317630.69

- **Net Assets of Series:** $88864672.18

- **Number of Shares Outstanding (Series):** 88864596.3000

- **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 (%)   |
|:---|:---|:---|:---|:---|
| 2025-05-01 | $141921021138.86          | $143729038421.11           | 83.9700%                  | 85.0400%                   |
| 2025-05-02 | $137573239767.40          | $139518110130.65           | 83.4700%                  | 84.6500%                   |
| 2025-05-05 | $143230791235.54          | $145175791100.12           | 84.0200%                  | 85.1600%                   |
| 2025-05-06 | $140303719177.27          | $141883762652.43           | 83.6800%                  | 84.6200%                   |
| 2025-05-07 | $140962019239.19          | $141455830522.97           | 84.2900%                  | 84.5800%                   |
| 2025-05-08 | $138054979241.34          | $139038808502.56           | 83.7600%                  | 84.3500%                   |
| 2025-05-09 | $135939802978.79          | $137833647762.57           | 83.3500%                  | 84.5100%                   |
| 2025-05-12 | $143293198277.81          | $145187089626.59           | 83.8500%                  | 84.9600%                   |
| 2025-05-13 | $147286348665.87          | $149400879872.45           | 83.4400%                  | 84.6400%                   |
| 2025-05-14 | $146551823859.86          | $147595746623.60           | 83.8800%                  | 84.4800%                   |
| 2025-05-15 | $144491658373.41          | $145725596287.19           | 83.6000%                  | 84.3200%                   |
| 2025-05-16 | $138645729224.62          | $141175729224.62           | 82.3400%                  | 83.8400%                   |
| 2025-05-19 | $140806329780.84          | $143336329780.84           | 82.5700%                  | 84.0500%                   |
| 2025-05-20 | $140604806592.70          | $143134806592.70           | 82.5500%                  | 84.0400%                   |
| 2025-05-21 | $144044775431.09          | $145474775431.09           | 83.4300%                  | 84.2600%                   |
| 2025-05-22 | $142310711788.39          | $142310711788.39           | 83.9600%                  | 83.9600%                   |
| 2025-05-23 | $138080557720.71          | $138680557720.71           | 83.2300%                  | 83.5900%                   |
| 2025-05-27 | $141357539469.76          | $141957539469.76           | 83.5200%                  | 83.8700%                   |
| 2025-05-28 | $143917528623.66          | $144517528623.66           | 83.7600%                  | 84.1100%                   |
| 2025-05-29 | $146574685118.64          | $146574685118.64           | 84.2200%                  | 84.2200%                   |
| 2025-05-30 | $147463765512.90          | $148063765512.90           | 84.0000%                  | 84.3400%                   |

### 7-Day Gross Yield
| Date       | 7-Day Gross Yield   |
|:---|:---|
| 2025-05-01 | 4.4000%             |
| 2025-05-02 | 4.4000%             |
| 2025-05-05 | 4.4000%             |
| 2025-05-06 | 4.3900%             |
| 2025-05-07 | 4.3900%             |
| 2025-05-08 | 4.3800%             |
| 2025-05-09 | 4.3700%             |
| 2025-05-12 | 4.3600%             |
| 2025-05-13 | 4.3600%             |
| 2025-05-14 | 4.3600%             |
| 2025-05-15 | 4.3600%             |
| 2025-05-16 | 4.3700%             |
| 2025-05-19 | 4.3700%             |
| 2025-05-20 | 4.3600%             |
| 2025-05-21 | 4.3600%             |
| 2025-05-22 | 4.3600%             |
| 2025-05-23 | 4.3500%             |
| 2025-05-27 | 4.3500%             |
| 2025-05-28 | 4.3500%             |
| 2025-05-29 | 4.3600%             |
| 2025-05-30 | 4.3700%             |

### Daily Net Asset Value per Share (Series)
| Date       | Net Asset Value per Share   |
|:---|:---|
| 2025-05-01 | 1.0001                      |
|  |  |
| 2025-05-02 | 1.0001                      |
|  |  |
| 2025-05-05 | 1.0001                      |
|  |  |
| 2025-05-06 | 1.0001                      |
|  |  |
| 2025-05-07 | 1.0001                      |
|  |  |
| 2025-05-08 | 1.0000                      |
|  |  |
| 2025-05-09 | 1.0000                      |
|  |  |
| 2025-05-12 | 1.0000                      |
|  |  |
| 2025-05-13 | 1.0000                      |
|  |  |
| 2025-05-14 | 1.0000                      |
|  |  |
| 2025-05-15 | 1.0000                      |
|  |  |
| 2025-05-16 | 1.0000                      |
|  |  |
| 2025-05-19 | 1.0000                      |
|  |  |
| 2025-05-20 | 1.0000                      |
|  |  |
| 2025-05-21 | 1.0000                      |
|  |  |
| 2025-05-22 | 1.0000                      |
|  |  |
| 2025-05-23 | 1.0000                      |
|  |  |
| 2025-05-27 | 1.0000                      |
|  |  |
| 2025-05-28 | 1.0000                      |
|  |  |
| 2025-05-29 | 1.0000                      |
|  |  |
| 2025-05-30 | 1.0000                      |
|  |  |

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

### Class: Advantage Class

- **Minimum Initial Investment:** $1000000.00

- **Net Assets of Class:** $88864672.18

- **Number of Shares Outstanding:** 88864596.3000

- **Expense Reimbursement/Waiver:** 5696.00

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2025-05-01 | 1.0001          |
|  |  |
| 2025-05-02 | 1.0001          |
|  |  |
| 2025-05-05 | 1.0001          |
|  |  |
| 2025-05-06 | 1.0001          |
|  |  |
| 2025-05-07 | 1.0001          |
|  |  |
| 2025-05-08 | 1.0000          |
|  |  |
| 2025-05-09 | 1.0000          |
|  |  |
| 2025-05-12 | 1.0000          |
|  |  |
| 2025-05-13 | 1.0000          |
|  |  |
| 2025-05-14 | 1.0000          |
|  |  |
| 2025-05-15 | 1.0000          |
|  |  |
| 2025-05-16 | 1.0000          |
|  |  |
| 2025-05-19 | 1.0000          |
|  |  |
| 2025-05-20 | 1.0000          |
|  |  |
| 2025-05-21 | 1.0000          |
|  |  |
| 2025-05-22 | 1.0000          |
|  |  |
| 2025-05-23 | 1.0000          |
|  |  |
| 2025-05-27 | 1.0000          |
|  |  |
| 2025-05-28 | 1.0000          |
|  |  |
| 2025-05-29 | 1.0000          |
|  |  |
| 2025-05-30 | 1.0000          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2025-05-01 | $405046.75                | $153947.66              |
| 2025-05-02 | $524001.00                | $251848.60              |
| 2025-05-05 | $688058.12                | $16170.00               |
| 2025-05-06 | $4092617.00               | $3537.66                |
| 2025-05-07 | $1648991.92               | $0.00                   |
| 2025-05-08 | $2320068.18               | $278236.98              |
| 2025-05-09 | $1128450.81               | $100000.00              |
| 2025-05-12 | $957675.84                | $265935.92              |
| 2025-05-13 | $390715.55                | $826131.77              |
| 2025-05-14 | $272756.96                | $831763.63              |
| 2025-05-15 | $1695020.00               | $107296.14              |
| 2025-05-16 | $591000.00                | $125730.00              |
| 2025-05-19 | $624865.00                | $80000.00               |
| 2025-05-20 | $1953583.38               | $533415.42              |
| 2025-05-21 | $484295.52                | $16000.00               |
| 2025-05-22 | $2616698.45               | $52720.00               |
| 2025-05-23 | $1069865.00               | $62352.72               |
| 2025-05-27 | $524372.59                | $652500.00              |
| 2025-05-28 | $658000.00                | $513766.40              |
| 2025-05-29 | $570748.53                | $155755.87              |
| 2025-05-30 | $480054.81                | $22500.00               |

**Total Gross Subscriptions (Month):** $23696885.41

**Total Gross Redemptions (Month):** $5049608.77

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2025-05-01 | 4.0100%           |
| 2025-05-02 | 4.0100%           |
| 2025-05-05 | 4.0100%           |
| 2025-05-06 | 4.0000%           |
| 2025-05-07 | 4.0000%           |
| 2025-05-08 | 3.9900%           |
| 2025-05-09 | 3.9800%           |
| 2025-05-12 | 3.9700%           |
| 2025-05-13 | 3.9700%           |
| 2025-05-14 | 3.9700%           |
| 2025-05-15 | 3.9700%           |
| 2025-05-16 | 3.9800%           |
| 2025-05-19 | 3.9800%           |
| 2025-05-20 | 3.9700%           |
| 2025-05-21 | 3.9700%           |
| 2025-05-22 | 3.9700%           |
| 2025-05-23 | 3.9600%           |
| 2025-05-27 | 3.9600%           |
| 2025-05-28 | 3.9600%           |
| 2025-05-29 | 3.9700%           |
| 2025-05-30 | 3.9800%           |

**Beneficial/Record Owner Categories**
| Category      | Other Category   | Record Owner %   | Beneficial Owner %   |
|:---|:---|:---|:---|
| Broker-dealer |  | 99.8800%         | 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):** $89182302.87
- **C.18.a - Value (excl. sponsor support):** $89182302.87
- **C.19 - Percentage of Net Assets:** 100.0000%
- **C.17 - Yield as of Reporting Date:** 0.0000%
- **C.11 - Maturity Date (WAM):** 2025-06-02
- **C.12 - Maturity Date (WAL):** 2025-06-02
- **C.13 - Final Legal Maturity Date:** 2025-06-02
- **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:** 2025-06-06

**By:** /s/ Chad Hallett

**Name of Signing Officer:** Chad Hallett

**Title of Signing Officer:** Deputy Treasurer