# EDGAR Filing Document

**Accession Number:** 0001107414
**File Stem:** 0001410368-25-039052
**Filing Date:** 2025-12
**Character Count:** 9737
**Document Hash:** 314a15bb516de524e895f2b454b2865d
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001410368-25-039052.hdr.sgml**: 20251218

**ACCESSION NUMBER**: 0001410368-25-039052

**CONFORMED SUBMISSION TYPE**: N-MFP3/A

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20250831

**FILED AS OF DATE**: 20251218

**DATE AS OF CHANGE**: 20251218

**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/A
- **SEC ACT:** 1940 Act
- **SEC FILE NUMBER:** 811-09819
- **FILM NUMBER:** 251582872

**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 Institutional U.S. Government Money Market Fund (Series ID: S000010701)

| Class ID   | Class Name                    | Ticker Symbol   |
|:---|:---|:---|
| C000052883 | Premier Class                 | GVMXX           |
| C000052884 | Investment Class              | GVVXX           |
| C000069459 | Select Class                  | GVSXX           |
| C000143775 | Institutional Class           | SAHXX           |
| C000143776 | Administration Class          | SALXX           |
| C000145476 | Investor Class                | SAMXX           |
| C000146109 | Class G                       | SSOXX           |
| C000175728 | Class M                       | GOMXX           |
| C000230478 | Bancroft Capital Class        | VTGXX           |
| C000231443 | Blaylock Van Class            | BUYXX           |
| C000231444 | Cabrera Capital Markets Class | CAHXX           |
| C000231963 | Opportunity Class             | OPGXX           |
| C000261738 | Trust Class                   | GVBXX           |

# Form N-MFP: Monthly Schedule of Portfolio Holdings

## N-MFP: Filer Information

**Submission Type:** N-MFP3/A

**Live/Test Flag:** —

**Is Electronic Copy of Paper Format:** —

**CIK:** —

### General Information

**Report for (YYYY-MM-DD):** 2025-08-31

**EDGAR Series Identifier:** S000010701

**Total number of share classes in the series:** —

**Is this the fund's final filing on Form N-MFP?:** —

**Is Fund Liquidating?:** —

**Is Fund Merging/Being Acquired?:** —

**Has the fund acquired or merged with another fund during the reporting period?:** —

## Part A: Series-Level Information about the Fund

### Service Providers
| Item   | Role                          | Details                                         | File/CIK Number   |
|:---|:---|:---|:---|
| A.5    | Administrator                 | SSGA Funds Management, Inc.                     |  |
| A.4    | Independent Public Accountant | Ernst & Young  LLP<br>City: Boston<br>State: MA |  |
| A.6    | Transfer Agent                | SS&C GIDS, Inc.<br>CIK: 0000027048              | 084-00448         |

### Fund Characteristics & Assets

- **A.1 - Securities Act File Number:** 333-30810

- **A.7 - Is this a Feeder Fund?:** Yes

- **A.8 - Is this a Master Fund?:** No

- **A.9 - Is this series primarily used to fund insurance company separate accounts?:** No

- **A.10 - Money Market Fund Category:** Government

- **A.11 - WAM:** 1 days

- **A.12 - WAL:** 1 days

- **Total Value of Portfolio Securities:** $166977287306.74

- **Amortized Cost of Portfolio Securities:** $166977287306.74

- **Cash:** $0.00

- **Total Other Assets:** $0.00

- **Total Liabilities:** $622390646.34

- **Net Assets of Series:** $166354896660.40

- **Number of Shares Outstanding (Series):** 166355316395.08

- **Stable Price Per Share:** Yes

- **7-Day Gross Yield:** 0.0435
2025-08-01

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

### Class: Unknown Class (—)

- **B.2 - Minimum Initial Investment:** $250000000.00

- **B.3 - Net Assets of Class:** $128042383580.33

- **B.4 - Shares Outstanding:** 128042639188.90

- **B.7.7 - 7-Day Net Yield:** 0.0424
2025-08-01

- **Person Paying for Fund Expenses?:** No

- **Expense Reimbursement/Waiver Description:** 0.00

- **Net flow for month:** —

### Class: Unknown Class (—)

- **B.2 - Minimum Initial Investment:** $25000000.00

- **B.3 - Net Assets of Class:** $131997832.49

- **B.4 - Shares Outstanding:** 132002339.17

- **B.7.7 - 7-Day Net Yield:** 0.0389
2025-08-01

- **Person Paying for Fund Expenses?:** No

- **Expense Reimbursement/Waiver Description:** 0.00

- **Net flow for month:** —

### Class: Unknown Class (—)

- **B.2 - Minimum Initial Investment:** $750000000.00

- **B.3 - Net Assets of Class:** $72564995.92

- **B.4 - Shares Outstanding:** 72564001.48

- **B.7.7 - 7-Day Net Yield:** 0.0427
2025-08-01

- **Person Paying for Fund Expenses?:** Yes

- **Expense Reimbursement/Waiver Description:** 1888.00

- **Net flow for month:** —

### Class: Unknown Class (—)

- **B.2 - Minimum Initial Investment:** $25000000.00

- **B.3 - Net Assets of Class:** $13738120373.20

- **B.4 - Shares Outstanding:** 13738162469.70

- **B.7.7 - 7-Day Net Yield:** 0.0421
2025-08-01

- **Person Paying for Fund Expenses?:** No

- **Expense Reimbursement/Waiver Description:** 0.00

- **Net flow for month:** —

### Class: Unknown Class (—)

- **B.2 - Minimum Initial Investment:** $1000.00

- **B.3 - Net Assets of Class:** $2240519785.84

- **B.4 - Shares Outstanding:** 2240540452.63

- **B.7.7 - 7-Day Net Yield:** 0.0399
2025-08-01

- **Person Paying for Fund Expenses?:** No

- **Expense Reimbursement/Waiver Description:** 0.00

- **Net flow for month:** —

### Class: Unknown Class (—)

- **B.2 - Minimum Initial Investment:** $10000000.00

- **B.3 - Net Assets of Class:** $3541011458.55

- **B.4 - Shares Outstanding:** 3541033280.70

- **B.7.7 - 7-Day Net Yield:** 0.0416
2025-08-01

- **Person Paying for Fund Expenses?:** No

- **Expense Reimbursement/Waiver Description:** 0.00

- **Net flow for month:** —

### Class: Unknown Class (—)

- **B.2 - Minimum Initial Investment:** $1000000000.00

- **B.3 - Net Assets of Class:** $9475009478.67

- **B.4 - Shares Outstanding:** 9475034264.74

- **B.7.7 - 7-Day Net Yield:** 0.0428
2025-08-01

- **Person Paying for Fund Expenses?:** No

- **Expense Reimbursement/Waiver Description:** 0.00

- **Net flow for month:** —

### Class: Unknown Class (—)

- **B.2 - Minimum Initial Investment:** $750000000.00

- **B.3 - Net Assets of Class:** $0.00

- **B.4 - Shares Outstanding:** 0.00

- **B.7.7 - 7-Day Net Yield:** 0.0000
2025-08-01

- **Person Paying for Fund Expenses?:** No

- **Expense Reimbursement/Waiver Description:** 0.00

- **Net flow for month:** —

### Class: Unknown Class (—)

- **B.2 - Minimum Initial Investment:** $25000000.00

- **B.3 - Net Assets of Class:** $60775606.38

- **B.4 - Shares Outstanding:** 60779256.28

- **B.7.7 - 7-Day Net Yield:** 0.0421
2025-08-01

- **Person Paying for Fund Expenses?:** No

- **Expense Reimbursement/Waiver Description:** 0.00

- **Net flow for month:** —

### Class: Unknown Class (—)

- **B.2 - Minimum Initial Investment:** $25000000.00

- **B.3 - Net Assets of Class:** $678866110.71

- **B.4 - Shares Outstanding:** 678867717.68

- **B.7.7 - 7-Day Net Yield:** 0.0421
2025-08-01

- **Person Paying for Fund Expenses?:** No

- **Expense Reimbursement/Waiver Description:** 0.00

- **Net flow for month:** —

### Class: Unknown Class (—)

- **B.2 - Minimum Initial Investment:** $25000000.00

- **B.3 - Net Assets of Class:** $27426180.42

- **B.4 - Shares Outstanding:** 27426016.80

- **B.7.7 - 7-Day Net Yield:** 0.0421
2025-08-01

- **Person Paying for Fund Expenses?:** No

- **Expense Reimbursement/Waiver Description:** 0.00

- **Net flow for month:** —

### Class: Unknown Class (—)

- **B.2 - Minimum Initial Investment:** $25000000.00

- **B.3 - Net Assets of Class:** $7742012114.56

- **B.4 - Shares Outstanding:** 7742040602.94

- **B.7.7 - 7-Day Net Yield:** 0.0421
2025-08-01

- **Person Paying for Fund Expenses?:** No

- **Expense Reimbursement/Waiver Description:** 0.00

- **Net flow for month:** —

### Class: Unknown Class (—)

- **B.2 - Minimum Initial Investment:** $1000000.00

- **B.3 - Net Assets of Class:** $604209143.33

- **B.4 - Shares Outstanding:** 604226804.06

- **B.7.7 - 7-Day Net Yield:** 0.0418
2025-08-01

- **Person Paying for Fund Expenses?:** No

- **Expense Reimbursement/Waiver Description:** 0.00

- **Net flow for month:** —

## 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: FSSgAK161, C.3 - LEI: N/A, CIK: 0001094885, C.5 - Other ID: FSSgAK161
- **C.18 - Value (incl. sponsor support):** $166977287306.74
- **C.18.a - Value (excl. sponsor support):** $166977287306.74
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 100.0000%
- **C.17 - Yield as of Reporting Date:** 0.0000%
- **C.11 - Maturity Date (WAM):** 2025-09-02
- **C.12 - Maturity Date (WAL):** 2025-09-02
- **C.13 - Final Legal Maturity Date:** 2025-09-02
- **Characteristics:** 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:** 2025-09-07

**By:** /s/ Chad Hallett

**Name of Signing Officer:** Chad Hallett

**Title of Signing Officer:** Deputy Treasurer