# EDGAR Filing Document

**Accession Number:** 0001107414
**File Stem:** 0001145549-25-045995
**Filing Date:** 2025-7
**Character Count:** 43687
**Document Hash:** e4a6a093886ebef0597270aeb554680a
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001145549-25-045995.hdr.sgml**: 20250708

**ACCESSION NUMBER**: 0001145549-25-045995

**CONFORMED SUBMISSION TYPE**: N-MFP3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20250630

**FILED AS OF DATE**: 20250708

**DATE AS OF CHANGE**: 20250708

**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:** 251109979

**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 Institutional Treasury Money Market Fund (Series ID: S000019117)

| Class ID   | Class Name                    | Ticker Symbol   |
|:---|:---|:---|
| C000052877 | Premier Class                 | TRIXX           |
| C000052878 | Investment Class              | TRVXX           |
| C000143780 | Administration Class          | SSKXX           |
| C000143781 | Institutional Class           | SSJXX           |
| C000143782 | Investor Class                | SSNXX           |
| C000230479 | Bancroft Capital Class        | VTTXX           |
| C000231445 | Cabrera Capital Markets Class | CSJXX           |
| C000231446 | Blaylock Van Class            |  |
| C000231964 | Opportunity Class             | OPRXX           |

# 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):** 2025-06-30

**Registrant Full Name:** STATE STREET INSTITUTIONAL INVESTMENT TRUST

**CIK Number of Registrant:** 0001107414

**LEI of Registrant:** 549300P1E098W6ES7M39

**Name of Series:** State Street Institutional Treasury Money Market Fund

**LEI of Series:** 549300Q3FHSMZ70NLT76

**EDGAR Series Identifier:** S000019117

**Total number of share classes in the series:** 9

**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:** $11834778002.75

- **Amortized Cost of Portfolio Securities:** $11834778002.75

- **Cash:** $0.00

- **Total Other Assets:** $0.00

- **Total Liabilities:** $43810226.39

- **Net Assets of Series:** $11790967776.36

- **Number of Shares Outstanding (Series):** 11790856430.6500

- **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 (%)   |
|:---|:---|:---|:---|:---|
| 2025-06-02 | $13663911246.00           | $13663911246.00            | 99.8400%                  | 99.8400%                   |
| 2025-06-03 | $13539313430.81           | $13539313430.81            | 99.8400%                  | 99.8400%                   |
| 2025-06-04 | $14045833203.13           | $14045833203.13            | 99.8400%                  | 99.8400%                   |
| 2025-06-05 | $13146714697.09           | $13146714697.09            | 99.8300%                  | 99.8300%                   |
| 2025-06-06 | $13129700981.24           | $13129700981.24            | 99.8200%                  | 99.8200%                   |
| 2025-06-09 | $13398659761.89           | $13398659761.89            | 99.8200%                  | 99.8200%                   |
| 2025-06-10 | $13071097715.97           | $13071097715.97            | 99.8100%                  | 99.8100%                   |
| 2025-06-11 | $14047870856.47           | $14047870856.47            | 99.8200%                  | 99.8200%                   |
| 2025-06-12 | $13494967775.76           | $13494967775.76            | 99.8000%                  | 99.8000%                   |
| 2025-06-13 | $13476209185.69           | $13476209185.69            | 99.7900%                  | 99.7900%                   |
| 2025-06-16 | $14353814845.82           | $14353814845.82            | 99.8000%                  | 99.8000%                   |
| 2025-06-17 | $14184790126.52           | $14184790126.52            | 99.7900%                  | 99.7900%                   |
| 2025-06-18 | $15198481987.89           | $15198481987.89            | 99.7800%                  | 99.7800%                   |
| 2025-06-20 | $13780467190.85           | $13831629336.93            | 99.3800%                  | 99.7500%                   |
| 2025-06-23 | $14581075471.00           | $14581075471.00            | 99.7500%                  | 99.7500%                   |
| 2025-06-24 | $14162804369.53           | $14162804369.53            | 99.7400%                  | 99.7400%                   |
| 2025-06-25 | $13924374033.54           | $13924374033.54            | 99.7300%                  | 99.7300%                   |
| 2025-06-26 | $13232077943.03           | $13232077943.03            | 99.7200%                  | 99.7200%                   |
| 2025-06-27 | $13584491712.11           | $13584491712.11            | 99.7200%                  | 99.7200%                   |
| 2025-06-30 | $12711810452.45           | $12711810452.45            | 99.8200%                  | 99.8200%                   |

### 7-Day Gross Yield
| Date       | 7-Day Gross Yield   |
|:---|:---|
| 2025-06-02 | 4.3300%             |
| 2025-06-03 | 4.3300%             |
| 2025-06-04 | 4.3300%             |
| 2025-06-05 | 4.3300%             |
| 2025-06-06 | 4.3200%             |
| 2025-06-09 | 4.3200%             |
| 2025-06-10 | 4.3200%             |
| 2025-06-11 | 4.3200%             |
| 2025-06-12 | 4.3200%             |
| 2025-06-13 | 4.3200%             |
| 2025-06-16 | 4.3200%             |
| 2025-06-17 | 4.3200%             |
| 2025-06-18 | 4.3200%             |
| 2025-06-20 | 4.3200%             |
| 2025-06-23 | 4.3200%             |
| 2025-06-24 | 4.3200%             |
| 2025-06-25 | 4.3200%             |
| 2025-06-26 | 4.3200%             |
| 2025-06-27 | 4.3200%             |
| 2025-06-30 | 4.3200%             |

### Daily Net Asset Value per Share (Series)
| Date       | Net Asset Value per Share   |
|:---|:---|
| 2025-06-02 | 1.0001                      |
|  |  |
| 2025-06-03 | 1.0001                      |
|  |  |
| 2025-06-04 | 1.0001                      |
|  |  |
| 2025-06-05 | 1.0001                      |
|  |  |
| 2025-06-06 | 1.0001                      |
|  |  |
| 2025-06-09 | 1.0001                      |
|  |  |
| 2025-06-10 | 1.0001                      |
|  |  |
| 2025-06-11 | 1.0001                      |
|  |  |
| 2025-06-12 | 1.0000                      |
|  |  |
| 2025-06-13 | 1.0001                      |
|  |  |
| 2025-06-16 | 1.0000                      |
|  |  |
| 2025-06-17 | 1.0000                      |
|  |  |
| 2025-06-18 | 1.0000                      |
|  |  |
| 2025-06-20 | 1.0001                      |
|  |  |
| 2025-06-23 | 1.0001                      |
|  |  |
| 2025-06-24 | 1.0001                      |
|  |  |
| 2025-06-25 | 1.0001                      |
|  |  |
| 2025-06-26 | 1.0001                      |
|  |  |
| 2025-06-27 | 1.0001                      |
|  |  |
| 2025-06-30 | 1.0001                      |
|  |  |

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

### Class: Premier Class

- **Minimum Initial Investment:** $250000000.00

- **Net Assets of Class:** $9922023080.04

- **Number of Shares Outstanding:** 9921938211.9800

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2025-06-02 | 1.0001          |
|  |  |
| 2025-06-03 | 1.0001          |
|  |  |
| 2025-06-04 | 1.0001          |
|  |  |
| 2025-06-05 | 1.0001          |
|  |  |
| 2025-06-06 | 1.0001          |
|  |  |
| 2025-06-09 | 1.0001          |
|  |  |
| 2025-06-10 | 1.0001          |
|  |  |
| 2025-06-11 | 1.0001          |
|  |  |
| 2025-06-12 | 1.0000          |
|  |  |
| 2025-06-13 | 1.0001          |
|  |  |
| 2025-06-16 | 1.0000          |
|  |  |
| 2025-06-17 | 1.0000          |
|  |  |
| 2025-06-18 | 1.0000          |
|  |  |
| 2025-06-20 | 1.0001          |
|  |  |
| 2025-06-23 | 1.0001          |
|  |  |
| 2025-06-24 | 1.0001          |
|  |  |
| 2025-06-25 | 1.0001          |
|  |  |
| 2025-06-26 | 1.0001          |
|  |  |
| 2025-06-27 | 1.0001          |
|  |  |
| 2025-06-30 | 1.0001          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2025-06-02 | $353796239.28             | $291098218.64           |
| 2025-06-03 | $412491913.22             | $274089193.77           |
| 2025-06-04 | $230659685.61             | $188392493.18           |
| 2025-06-05 | $220349477.22             | $197401799.34           |
| 2025-06-06 | $118122224.48             | $283775322.44           |
| 2025-06-09 | $201498285.74             | $285408044.38           |
| 2025-06-10 | $192403567.04             | $197420548.71           |
| 2025-06-11 | $408740605.12             | $121254053.08           |
| 2025-06-12 | $373287592.46             | $320090270.49           |
| 2025-06-13 | $189047481.40             | $192244447.17           |
| 2025-06-16 | $447985921.56             | $159286201.89           |
| 2025-06-17 | $309362549.67             | $356806700.23           |
| 2025-06-18 | $483395169.34             | $203560140.08           |
| 2025-06-20 | $158655019.53             | $302737352.53           |
| 2025-06-23 | $226078971.26             | $274680014.06           |
| 2025-06-24 | $400278627.76             | $353335498.67           |
| 2025-06-25 | $236126063.46             | $284555433.56           |
| 2025-06-26 | $176494509.11             | $451522663.55           |
| 2025-06-27 | $300059888.76             | $336387756.61           |
| 2025-06-30 | $216523928.50             | $720734884.77           |

**Total Gross Subscriptions (Month):** $5655357720.52

**Total Gross Redemptions (Month):** $5794781037.15

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2025-06-02 | 4.2200%           |
| 2025-06-03 | 4.2200%           |
| 2025-06-04 | 4.2200%           |
| 2025-06-05 | 4.2200%           |
| 2025-06-06 | 4.2100%           |
| 2025-06-09 | 4.2100%           |
| 2025-06-10 | 4.2100%           |
| 2025-06-11 | 4.2100%           |
| 2025-06-12 | 4.2100%           |
| 2025-06-13 | 4.2100%           |
| 2025-06-16 | 4.2100%           |
| 2025-06-17 | 4.2100%           |
| 2025-06-18 | 4.2100%           |
| 2025-06-20 | 4.2100%           |
| 2025-06-23 | 4.2100%           |
| 2025-06-24 | 4.2100%           |
| 2025-06-25 | 4.2100%           |
| 2025-06-26 | 4.2000%           |
| 2025-06-27 | 4.2000%           |
| 2025-06-30 | 4.2000%           |

**Beneficial/Record Owner Categories**
| Category                                            | Other Category   | Record Owner %   | Beneficial Owner %   |
|:---|:---|:---|:---|
| Depository institution or other banking institution |  | 21.0400%         | 0.0000%              |
| Non-financial corporation                           |  | 51.9300%         | 0.0000%              |

### Class: Investment

- **Minimum Initial Investment:** $25000000.00

- **Net Assets of Class:** $177131286.42

- **Number of Shares Outstanding:** 177128063.3400

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2025-06-02 | 1.0001          |
|  |  |
| 2025-06-03 | 1.0001          |
|  |  |
| 2025-06-04 | 1.0001          |
|  |  |
| 2025-06-05 | 1.0001          |
|  |  |
| 2025-06-06 | 1.0001          |
|  |  |
| 2025-06-09 | 1.0001          |
|  |  |
| 2025-06-10 | 1.0001          |
|  |  |
| 2025-06-11 | 1.0001          |
|  |  |
| 2025-06-12 | 1.0000          |
|  |  |
| 2025-06-13 | 1.0001          |
|  |  |
| 2025-06-16 | 1.0001          |
|  |  |
| 2025-06-17 | 1.0001          |
|  |  |
| 2025-06-18 | 1.0001          |
|  |  |
| 2025-06-20 | 1.0001          |
|  |  |
| 2025-06-23 | 1.0001          |
|  |  |
| 2025-06-24 | 1.0001          |
|  |  |
| 2025-06-25 | 1.0001          |
|  |  |
| 2025-06-26 | 1.0001          |
|  |  |
| 2025-06-27 | 1.0001          |
|  |  |
| 2025-06-30 | 1.0001          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2025-06-02 | $13484691.72              | $1832273.97             |
| 2025-06-03 | $0.00                     | $14182433.76            |
| 2025-06-04 | $8905.87                  | $145478.09              |
| 2025-06-05 | $2334385.84               | $0.00                   |
| 2025-06-06 | $43109.28                 | $982667.62              |
| 2025-06-09 | $0.00                     | $826393.34              |
| 2025-06-10 | $0.00                     | $141340.88              |
| 2025-06-11 | $625493.57                | $3790.02                |
| 2025-06-12 | $1957864.65               | $40720.29               |
| 2025-06-13 | $0.00                     | $811977.33              |
| 2025-06-16 | $152555.03                | $1098215.54             |
| 2025-06-17 | $1602000.00               | $757016.99              |
| 2025-06-18 | $221236.06                | $253478.39              |
| 2025-06-20 | $8537308.17               | $0.00                   |
| 2025-06-23 | $126818.04                | $2599516.00             |
| 2025-06-24 | $48856187.54              | $1111010.40             |
| 2025-06-25 | $519455.33                | $400.52                 |
| 2025-06-26 | $50918.88                 | $882024.73              |
| 2025-06-27 | $0.00                     | $4164453.30             |
| 2025-06-30 | $695543.87                | $45734735.37            |

**Total Gross Subscriptions (Month):** $79216473.85

**Total Gross Redemptions (Month):** $75567926.54

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2025-06-02 | 3.8700%           |
| 2025-06-03 | 3.8700%           |
| 2025-06-04 | 3.8700%           |
| 2025-06-05 | 3.8700%           |
| 2025-06-06 | 3.8600%           |
| 2025-06-09 | 3.8600%           |
| 2025-06-10 | 3.8600%           |
| 2025-06-11 | 3.8600%           |
| 2025-06-12 | 3.8600%           |
| 2025-06-13 | 3.8600%           |
| 2025-06-16 | 3.8600%           |
| 2025-06-17 | 3.8600%           |
| 2025-06-18 | 3.8600%           |
| 2025-06-20 | 3.8600%           |
| 2025-06-23 | 3.8600%           |
| 2025-06-24 | 3.8600%           |
| 2025-06-25 | 3.8600%           |
| 2025-06-26 | 3.8500%           |
| 2025-06-27 | 3.8500%           |
| 2025-06-30 | 3.8500%           |

**Beneficial/Record Owner Categories**
| Category                                            | Other Category   | Record Owner %   | Beneficial Owner %   |
|:---|:---|:---|:---|
| Depository institution or other banking institution |  | 82.8500%         | 0.0000%              |
| Depository institution or other banking institution |  | 15.3700%         | 0.0000%              |

### Class: Administration Class

- **Minimum Initial Investment:** $50000.00

- **Net Assets of Class:** $563312065.40

- **Number of Shares Outstanding:** 563308292.7500

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2025-06-02 | 1.0001          |
|  |  |
| 2025-06-03 | 1.0001          |
|  |  |
| 2025-06-04 | 1.0001          |
|  |  |
| 2025-06-05 | 1.0001          |
|  |  |
| 2025-06-06 | 1.0001          |
|  |  |
| 2025-06-09 | 1.0001          |
|  |  |
| 2025-06-10 | 1.0001          |
|  |  |
| 2025-06-11 | 1.0001          |
|  |  |
| 2025-06-12 | 1.0000          |
|  |  |
| 2025-06-13 | 1.0001          |
|  |  |
| 2025-06-16 | 1.0000          |
|  |  |
| 2025-06-17 | 1.0000          |
|  |  |
| 2025-06-18 | 1.0000          |
|  |  |
| 2025-06-20 | 1.0001          |
|  |  |
| 2025-06-23 | 1.0001          |
|  |  |
| 2025-06-24 | 1.0001          |
|  |  |
| 2025-06-25 | 1.0001          |
|  |  |
| 2025-06-26 | 1.0001          |
|  |  |
| 2025-06-27 | 1.0001          |
|  |  |
| 2025-06-30 | 1.0001          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2025-06-02 | $1929363.09               | $0.00                   |
| 2025-06-03 | $0.00                     | $0.00                   |
| 2025-06-04 | $3706111.07               | $0.00                   |
| 2025-06-05 | $0.00                     | $21441.07               |
| 2025-06-06 | $2408054.30               | $3.72                   |
| 2025-06-09 | $0.00                     | $0.00                   |
| 2025-06-10 | $0.00                     | $0.08                   |
| 2025-06-11 | $0.00                     | $0.00                   |
| 2025-06-12 | $0.00                     | $0.00                   |
| 2025-06-13 | $0.00                     | $0.00                   |
| 2025-06-16 | $0.00                     | $0.00                   |
| 2025-06-17 | $0.00                     | $0.00                   |
| 2025-06-18 | $0.00                     | $0.00                   |
| 2025-06-20 | $1753879.74               | $0.00                   |
| 2025-06-23 | $0.00                     | $0.00                   |
| 2025-06-24 | $0.00                     | $6682.57                |
| 2025-06-25 | $0.00                     | $1899259.93             |
| 2025-06-26 | $0.00                     | $0.00                   |
| 2025-06-27 | $19964473.78              | $16760253.49            |
| 2025-06-30 | $0.00                     | $19964473.78            |

**Total Gross Subscriptions (Month):** $29761881.98

**Total Gross Redemptions (Month):** $38652114.64

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2025-06-02 | 3.9700%           |
| 2025-06-03 | 3.9700%           |
| 2025-06-04 | 3.9700%           |
| 2025-06-05 | 3.9700%           |
| 2025-06-06 | 3.9600%           |
| 2025-06-09 | 3.9600%           |
| 2025-06-10 | 3.9600%           |
| 2025-06-11 | 3.9600%           |
| 2025-06-12 | 3.9600%           |
| 2025-06-13 | 3.9600%           |
| 2025-06-16 | 3.9600%           |
| 2025-06-17 | 3.9600%           |
| 2025-06-18 | 3.9600%           |
| 2025-06-20 | 3.9600%           |
| 2025-06-23 | 3.9600%           |
| 2025-06-24 | 3.9600%           |
| 2025-06-25 | 3.9600%           |
| 2025-06-26 | 3.9500%           |
| 2025-06-27 | 3.9500%           |
| 2025-06-30 | 3.9500%           |

**Beneficial/Record Owner Categories**
| Category                                            | Other Category   | Record Owner %   | Beneficial Owner %   |
|:---|:---|:---|:---|
| Depository institution or other banking institution |  | 99.8500%         | 0.0000%              |

### Class: Institutional Class

- **Minimum Initial Investment:** $50000.00

- **Net Assets of Class:** $816374502.10

- **Number of Shares Outstanding:** 816362360.7000

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2025-06-02 | 1.0001          |
|  |  |
| 2025-06-03 | 1.0001          |
|  |  |
| 2025-06-04 | 1.0001          |
|  |  |
| 2025-06-05 | 1.0001          |
|  |  |
| 2025-06-06 | 1.0001          |
|  |  |
| 2025-06-09 | 1.0001          |
|  |  |
| 2025-06-10 | 1.0001          |
|  |  |
| 2025-06-11 | 1.0001          |
|  |  |
| 2025-06-12 | 1.0000          |
|  |  |
| 2025-06-13 | 1.0001          |
|  |  |
| 2025-06-16 | 1.0001          |
|  |  |
| 2025-06-17 | 1.0001          |
|  |  |
| 2025-06-18 | 1.0001          |
|  |  |
| 2025-06-20 | 1.0001          |
|  |  |
| 2025-06-23 | 1.0001          |
|  |  |
| 2025-06-24 | 1.0001          |
|  |  |
| 2025-06-25 | 1.0001          |
|  |  |
| 2025-06-26 | 1.0001          |
|  |  |
| 2025-06-27 | 1.0001          |
|  |  |
| 2025-06-30 | 1.0001          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2025-06-02 | $13360310.10              | $75490.67               |
| 2025-06-03 | $672463.10                | $39776545.62            |
| 2025-06-04 | $50089986.64              | $12528589.59            |
| 2025-06-05 | $37043481.88              | $9904990.46             |
| 2025-06-06 | $155060000.00             | $5632764.47             |
| 2025-06-09 | $2070840.19               | $143631691.54           |
| 2025-06-10 | $11560927.69              | $2519000.00             |
| 2025-06-11 | $62082109.70              | $19715860.32            |
| 2025-06-12 | $1821982.89               | $32638027.03            |
| 2025-06-13 | $22761076.39              | $36962081.01            |
| 2025-06-16 | $7307100.00               | $1085000.00             |
| 2025-06-17 | $1384863.00               | $8224417.00             |
| 2025-06-18 | $3349550.42               | $43635000.00            |
| 2025-06-20 | $47795.21                 | $14256381.53            |
| 2025-06-23 | $173988572.38             | $0.00                   |
| 2025-06-24 | $1704750.65               | $14620000.00            |
| 2025-06-25 | $2761323.27               | $157587040.16           |
| 2025-06-26 | $1791505.42               | $14809381.64            |
| 2025-06-27 | $1913425.92               | $153360869.44           |
| 2025-06-30 | $29304042.73              | $6104715.42             |

**Total Gross Subscriptions (Month):** $580076107.58

**Total Gross Redemptions (Month):** $717067845.90

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2025-06-02 | 4.1900%           |
| 2025-06-03 | 4.1900%           |
| 2025-06-04 | 4.1900%           |
| 2025-06-05 | 4.1900%           |
| 2025-06-06 | 4.1800%           |
| 2025-06-09 | 4.1800%           |
| 2025-06-10 | 4.1800%           |
| 2025-06-11 | 4.1800%           |
| 2025-06-12 | 4.1800%           |
| 2025-06-13 | 4.1800%           |
| 2025-06-16 | 4.1800%           |
| 2025-06-17 | 4.1800%           |
| 2025-06-18 | 4.1800%           |
| 2025-06-20 | 4.1800%           |
| 2025-06-23 | 4.1800%           |
| 2025-06-24 | 4.1800%           |
| 2025-06-25 | 4.1800%           |
| 2025-06-26 | 4.1700%           |
| 2025-06-27 | 4.1700%           |
| 2025-06-30 | 4.1700%           |

**Beneficial/Record Owner Categories**
| Category                                            | Other Category   | Record Owner %   | Beneficial Owner %   |
|:---|:---|:---|:---|
| Broker-dealer                                       |  | 17.3700%         | 0.0000%              |
| Depository institution or other banking institution |  | 42.8200%         | 0.0000%              |
| Depository institution or other banking institution |  | 27.8800%         | 0.0000%              |
| Non-financial corporation                           |  | 7.6800%          | 0.0000%              |

### Class: Investor Class

- **Minimum Initial Investment:** $10000000.00

- **Net Assets of Class:** $267362726.69

- **Number of Shares Outstanding:** 267357691.3700

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2025-06-02 | 1.0001          |
|  |  |
| 2025-06-03 | 1.0001          |
|  |  |
| 2025-06-04 | 1.0001          |
|  |  |
| 2025-06-05 | 1.0001          |
|  |  |
| 2025-06-06 | 1.0001          |
|  |  |
| 2025-06-09 | 1.0001          |
|  |  |
| 2025-06-10 | 1.0001          |
|  |  |
| 2025-06-11 | 1.0001          |
|  |  |
| 2025-06-12 | 1.0000          |
|  |  |
| 2025-06-13 | 1.0001          |
|  |  |
| 2025-06-16 | 1.0001          |
|  |  |
| 2025-06-17 | 1.0001          |
|  |  |
| 2025-06-18 | 1.0001          |
|  |  |
| 2025-06-20 | 1.0001          |
|  |  |
| 2025-06-23 | 1.0001          |
|  |  |
| 2025-06-24 | 1.0001          |
|  |  |
| 2025-06-25 | 1.0001          |
|  |  |
| 2025-06-26 | 1.0001          |
|  |  |
| 2025-06-27 | 1.0001          |
|  |  |
| 2025-06-30 | 1.0001          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2025-06-02 | $6394357.23               | $103271477.49           |
| 2025-06-03 | $58504974.44              | $22644724.45            |
| 2025-06-04 | $852714.89                | $1420595.88             |
| 2025-06-05 | $1925273.99               | $11501991.26            |
| 2025-06-06 | $2411622.62               | $6372462.55             |
| 2025-06-09 | $3237130.45               | $2106241.11             |
| 2025-06-10 | $3617496.08               | $571242.17              |
| 2025-06-11 | $4477718.99               | $2625057.87             |
| 2025-06-12 | $13883837.51              | $5862454.52             |
| 2025-06-13 | $1789078.23               | $7364144.36             |
| 2025-06-16 | $7275073.68               | $18690800.63            |
| 2025-06-17 | $22789095.12              | $14775711.46            |
| 2025-06-18 | $2320309.30               | $1851385.55             |
| 2025-06-20 | $2968102.89               | $9866966.45             |
| 2025-06-23 | $18095621.18              | $16622192.29            |
| 2025-06-24 | $614894.78                | $4551838.56             |
| 2025-06-25 | $912286.19                | $8916608.67             |
| 2025-06-26 | $10597929.42              | $4246404.79             |
| 2025-06-27 | $4974427.70               | $995437.90              |
| 2025-06-30 | $35615490.97              | $1818520.40             |

**Total Gross Subscriptions (Month):** $203257435.66

**Total Gross Redemptions (Month):** $246076258.36

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2025-06-02 | 4.1400%           |
| 2025-06-03 | 4.1400%           |
| 2025-06-04 | 4.1400%           |
| 2025-06-05 | 4.1400%           |
| 2025-06-06 | 4.1300%           |
| 2025-06-09 | 4.1300%           |
| 2025-06-10 | 4.1300%           |
| 2025-06-11 | 4.1300%           |
| 2025-06-12 | 4.1300%           |
| 2025-06-13 | 4.1300%           |
| 2025-06-16 | 4.1300%           |
| 2025-06-17 | 4.1300%           |
| 2025-06-18 | 4.1300%           |
| 2025-06-20 | 4.1300%           |
| 2025-06-23 | 4.1300%           |
| 2025-06-24 | 4.1300%           |
| 2025-06-25 | 4.1300%           |
| 2025-06-26 | 4.1200%           |
| 2025-06-27 | 4.1200%           |
| 2025-06-30 | 4.1200%           |

**Beneficial/Record Owner Categories**
| Category                  | Other Category   | Record Owner %   | Beneficial Owner %   |
|:---|:---|:---|:---|
| Non-financial corporation |  | 7.5400%          | 0.0000%              |
| Non-financial corporation |  | 87.6500%         | 0.0000%              |

### Class: Bancroft Capital Class

- **Minimum Initial Investment:** $25000000.00

- **Net Assets of Class:** $50017.03

- **Number of Shares Outstanding:** 50000.0000

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2025-06-02 | 1.0004          |
|  |  |
| 2025-06-03 | 1.0004          |
|  |  |
| 2025-06-04 | 1.0004          |
|  |  |
| 2025-06-05 | 1.0004          |
|  |  |
| 2025-06-06 | 1.0004          |
|  |  |
| 2025-06-09 | 1.0004          |
|  |  |
| 2025-06-10 | 1.0004          |
|  |  |
| 2025-06-11 | 1.0004          |
|  |  |
| 2025-06-12 | 1.0004          |
|  |  |
| 2025-06-13 | 1.0004          |
|  |  |
| 2025-06-16 | 1.0004          |
|  |  |
| 2025-06-17 | 1.0004          |
|  |  |
| 2025-06-18 | 1.0004          |
|  |  |
| 2025-06-20 | 1.0004          |
|  |  |
| 2025-06-23 | 1.0004          |
|  |  |
| 2025-06-24 | 1.0004          |
|  |  |
| 2025-06-25 | 1.0004          |
|  |  |
| 2025-06-26 | 1.0004          |
|  |  |
| 2025-06-27 | 1.0004          |
|  |  |
| 2025-06-30 | 1.0004          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2025-06-02 | $0.00                     | $0.00                   |
| 2025-06-03 | $0.00                     | $0.00                   |
| 2025-06-04 | $0.00                     | $0.00                   |
| 2025-06-05 | $0.00                     | $0.00                   |
| 2025-06-06 | $0.00                     | $0.00                   |
| 2025-06-09 | $0.00                     | $0.00                   |
| 2025-06-10 | $0.00                     | $0.00                   |
| 2025-06-11 | $0.00                     | $0.00                   |
| 2025-06-12 | $0.00                     | $0.00                   |
| 2025-06-13 | $0.00                     | $0.00                   |
| 2025-06-16 | $0.00                     | $0.00                   |
| 2025-06-17 | $0.00                     | $0.00                   |
| 2025-06-18 | $0.00                     | $0.00                   |
| 2025-06-20 | $0.00                     | $0.00                   |
| 2025-06-23 | $0.00                     | $0.00                   |
| 2025-06-24 | $0.00                     | $0.00                   |
| 2025-06-25 | $0.00                     | $0.00                   |
| 2025-06-26 | $0.00                     | $0.00                   |
| 2025-06-27 | $0.00                     | $0.00                   |
| 2025-06-30 | $0.00                     | $0.00                   |

**Total Gross Subscriptions (Month):** $0.00

**Total Gross Redemptions (Month):** $0.00

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2025-06-02 | 4.2000%           |
| 2025-06-03 | 4.1900%           |
| 2025-06-04 | 4.1900%           |
| 2025-06-05 | 4.1900%           |
| 2025-06-06 | 4.1800%           |
| 2025-06-09 | 4.1800%           |
| 2025-06-10 | 4.1800%           |
| 2025-06-11 | 4.1800%           |
| 2025-06-12 | 4.1800%           |
| 2025-06-13 | 4.1800%           |
| 2025-06-16 | 4.1800%           |
| 2025-06-17 | 4.1900%           |
| 2025-06-18 | 4.1900%           |
| 2025-06-20 | 4.1900%           |
| 2025-06-23 | 4.1900%           |
| 2025-06-24 | 4.1800%           |
| 2025-06-25 | 4.1800%           |
| 2025-06-26 | 4.1800%           |
| 2025-06-27 | 4.1800%           |
| 2025-06-30 | 4.1800%           |

**Beneficial/Record Owner Categories**
| Category                  | Other Category   | Record Owner %   | Beneficial Owner %   |
|:---|:---|:---|:---|
| Non-financial corporation |  | 100.0000%        | 0.0000%              |

### Class: Cabrera Capital Markets Class

- **Minimum Initial Investment:** $25000000.00

- **Net Assets of Class:** $12057017.17

- **Number of Shares Outstanding:** 12056988.7000

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2025-06-02 | 1.0001          |
|  |  |
| 2025-06-03 | 1.0001          |
|  |  |
| 2025-06-04 | 1.0001          |
|  |  |
| 2025-06-05 | 1.0001          |
|  |  |
| 2025-06-06 | 1.0001          |
|  |  |
| 2025-06-09 | 1.0001          |
|  |  |
| 2025-06-10 | 1.0001          |
|  |  |
| 2025-06-11 | 1.0001          |
|  |  |
| 2025-06-12 | 1.0000          |
|  |  |
| 2025-06-13 | 1.0001          |
|  |  |
| 2025-06-16 | 1.0000          |
|  |  |
| 2025-06-17 | 1.0000          |
|  |  |
| 2025-06-18 | 1.0000          |
|  |  |
| 2025-06-20 | 1.0001          |
|  |  |
| 2025-06-23 | 1.0001          |
|  |  |
| 2025-06-24 | 1.0001          |
|  |  |
| 2025-06-25 | 1.0001          |
|  |  |
| 2025-06-26 | 1.0001          |
|  |  |
| 2025-06-27 | 1.0001          |
|  |  |
| 2025-06-30 | 1.0001          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2025-06-02 | $32323.77                 | $0.00                   |
| 2025-06-03 | $0.00                     | $9046656.81             |
| 2025-06-04 | $0.00                     | $0.00                   |
| 2025-06-05 | $0.00                     | $0.00                   |
| 2025-06-06 | $0.00                     | $0.00                   |
| 2025-06-09 | $0.00                     | $0.00                   |
| 2025-06-10 | $0.00                     | $0.00                   |
| 2025-06-11 | $0.00                     | $0.00                   |
| 2025-06-12 | $0.00                     | $0.00                   |
| 2025-06-13 | $0.00                     | $0.00                   |
| 2025-06-16 | $0.00                     | $0.00                   |
| 2025-06-17 | $0.00                     | $0.00                   |
| 2025-06-18 | $0.00                     | $0.00                   |
| 2025-06-20 | $0.00                     | $0.00                   |
| 2025-06-23 | $0.00                     | $0.00                   |
| 2025-06-24 | $0.00                     | $0.00                   |
| 2025-06-25 | $0.00                     | $0.00                   |
| 2025-06-26 | $0.00                     | $0.00                   |
| 2025-06-27 | $0.00                     | $0.00                   |
| 2025-06-30 | $0.00                     | $0.00                   |

**Total Gross Subscriptions (Month):** $32323.77

**Total Gross Redemptions (Month):** $9046656.81

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2025-06-02 | 4.1900%           |
| 2025-06-03 | 4.1900%           |
| 2025-06-04 | 4.1900%           |
| 2025-06-05 | 4.1900%           |
| 2025-06-06 | 4.1800%           |
| 2025-06-09 | 4.1800%           |
| 2025-06-10 | 4.1800%           |
| 2025-06-11 | 4.1800%           |
| 2025-06-12 | 4.1800%           |
| 2025-06-13 | 4.1800%           |
| 2025-06-16 | 4.1800%           |
| 2025-06-17 | 4.1800%           |
| 2025-06-18 | 4.1800%           |
| 2025-06-20 | 4.1800%           |
| 2025-06-23 | 4.1800%           |
| 2025-06-24 | 4.1800%           |
| 2025-06-25 | 4.1800%           |
| 2025-06-26 | 4.1700%           |
| 2025-06-27 | 4.1700%           |
| 2025-06-30 | 4.1700%           |

**Beneficial/Record Owner Categories**
| Category      | Other Category   | Record Owner %   | Beneficial Owner %   |
|:---|:---|:---|:---|
| Broker-dealer |  | 99.5200%         | 0.0000%              |

### Class: Blaylock Van Class

- **Minimum Initial Investment:** $25000000.00

- **Net Assets of Class:** $0.00

- **Number of Shares Outstanding:** 0.0000

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2025-06-02 | 0.0000          |
|  |  |
| 2025-06-03 | 0.0000          |
|  |  |
| 2025-06-04 | 0.0000          |
|  |  |
| 2025-06-05 | 0.0000          |
|  |  |
| 2025-06-06 | 0.0000          |
|  |  |
| 2025-06-09 | 0.0000          |
|  |  |
| 2025-06-10 | 0.0000          |
|  |  |
| 2025-06-11 | 0.0000          |
|  |  |
| 2025-06-12 | 0.0000          |
|  |  |
| 2025-06-13 | 0.0000          |
|  |  |
| 2025-06-16 | 0.0000          |
|  |  |
| 2025-06-17 | 0.0000          |
|  |  |
| 2025-06-18 | 0.0000          |
|  |  |
| 2025-06-20 | 0.0000          |
|  |  |
| 2025-06-23 | 0.0000          |
|  |  |
| 2025-06-24 | 0.0000          |
|  |  |
| 2025-06-25 | 0.0000          |
|  |  |
| 2025-06-26 | 0.0000          |
|  |  |
| 2025-06-27 | 0.0000          |
|  |  |
| 2025-06-30 | 0.0000          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2025-06-02 | $0.00                     | $0.00                   |
| 2025-06-03 | $0.00                     | $0.00                   |
| 2025-06-04 | $0.00                     | $0.00                   |
| 2025-06-05 | $0.00                     | $0.00                   |
| 2025-06-06 | $0.00                     | $0.00                   |
| 2025-06-09 | $0.00                     | $0.00                   |
| 2025-06-10 | $0.00                     | $0.00                   |
| 2025-06-11 | $0.00                     | $0.00                   |
| 2025-06-12 | $0.00                     | $0.00                   |
| 2025-06-13 | $0.00                     | $0.00                   |
| 2025-06-16 | $0.00                     | $0.00                   |
| 2025-06-17 | $0.00                     | $0.00                   |
| 2025-06-18 | $0.00                     | $0.00                   |
| 2025-06-20 | $0.00                     | $0.00                   |
| 2025-06-23 | $0.00                     | $0.00                   |
| 2025-06-24 | $0.00                     | $0.00                   |
| 2025-06-25 | $0.00                     | $0.00                   |
| 2025-06-26 | $0.00                     | $0.00                   |
| 2025-06-27 | $0.00                     | $0.00                   |
| 2025-06-30 | $0.00                     | $0.00                   |

**Total Gross Subscriptions (Month):** $0.00

**Total Gross Redemptions (Month):** $0.00

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2025-06-02 | 0.0000%           |
| 2025-06-03 | 0.0000%           |
| 2025-06-04 | 0.0000%           |
| 2025-06-05 | 0.0000%           |
| 2025-06-06 | 0.0000%           |
| 2025-06-09 | 0.0000%           |
| 2025-06-10 | 0.0000%           |
| 2025-06-11 | 0.0000%           |
| 2025-06-12 | 0.0000%           |
| 2025-06-13 | 0.0000%           |
| 2025-06-16 | 0.0000%           |
| 2025-06-17 | 0.0000%           |
| 2025-06-18 | 0.0000%           |
| 2025-06-20 | 0.0000%           |
| 2025-06-23 | 0.0000%           |
| 2025-06-24 | 0.0000%           |
| 2025-06-25 | 0.0000%           |
| 2025-06-26 | 0.0000%           |
| 2025-06-27 | 0.0000%           |
| 2025-06-30 | 0.0000%           |

### Class: Opportunity Class

- **Minimum Initial Investment:** $25000000.00

- **Net Assets of Class:** $32657081.51

- **Number of Shares Outstanding:** 32654821.8100

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2025-06-02 | 1.0001          |
|  |  |
| 2025-06-03 | 1.0001          |
|  |  |
| 2025-06-04 | 1.0001          |
|  |  |
| 2025-06-05 | 1.0001          |
|  |  |
| 2025-06-06 | 1.0001          |
|  |  |
| 2025-06-09 | 1.0001          |
|  |  |
| 2025-06-10 | 1.0001          |
|  |  |
| 2025-06-11 | 1.0001          |
|  |  |
| 2025-06-12 | 1.0000          |
|  |  |
| 2025-06-13 | 1.0001          |
|  |  |
| 2025-06-16 | 1.0001          |
|  |  |
| 2025-06-17 | 1.0001          |
|  |  |
| 2025-06-18 | 1.0001          |
|  |  |
| 2025-06-20 | 1.0001          |
|  |  |
| 2025-06-23 | 1.0001          |
|  |  |
| 2025-06-24 | 1.0001          |
|  |  |
| 2025-06-25 | 1.0001          |
|  |  |
| 2025-06-26 | 1.0001          |
|  |  |
| 2025-06-27 | 1.0001          |
|  |  |
| 2025-06-30 | 1.0001          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2025-06-02 | $17151943.41              | $67640.31               |
| 2025-06-03 | $94300000.04              | $0.00                   |
| 2025-06-04 | $0.00                     | $0.00                   |
| 2025-06-05 | $1999000.00               | $61323000.00            |
| 2025-06-06 | $2000000.00               | $5005810.00             |
| 2025-06-09 | $0.00                     | $8350000.00             |
| 2025-06-10 | $0.00                     | $9500000.00             |
| 2025-06-11 | $80000000.00              | $15000000.00            |
| 2025-06-12 | $0.00                     | $12700000.00            |
| 2025-06-13 | $0.00                     | $0.00                   |
| 2025-06-16 | $0.00                     | $0.00                   |
| 2025-06-17 | $4200000.00               | $0.00                   |
| 2025-06-18 | $0.00                     | $2500000.00             |
| 2025-06-20 | $0.00                     | $1723987.44             |
| 2025-06-23 | $0.00                     | $0.00                   |
| 2025-06-24 | $0.00                     | $15000000.00            |
| 2025-06-25 | $2000000.00               | $49900000.00            |
| 2025-06-26 | $0.00                     | $48476999.97            |
| 2025-06-27 | $0.00                     | $0.00                   |
| 2025-06-30 | $225000.00                | $0.00                   |

**Total Gross Subscriptions (Month):** $201875943.45

**Total Gross Redemptions (Month):** $229547437.72

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2025-06-02 | 4.1900%           |
| 2025-06-03 | 4.1900%           |
| 2025-06-04 | 4.1900%           |
| 2025-06-05 | 4.1900%           |
| 2025-06-06 | 4.1800%           |
| 2025-06-09 | 4.1800%           |
| 2025-06-10 | 4.1800%           |
| 2025-06-11 | 4.1800%           |
| 2025-06-12 | 4.1800%           |
| 2025-06-13 | 4.1800%           |
| 2025-06-16 | 4.1800%           |
| 2025-06-17 | 4.1800%           |
| 2025-06-18 | 4.1800%           |
| 2025-06-20 | 4.1800%           |
| 2025-06-23 | 4.1800%           |
| 2025-06-24 | 4.1800%           |
| 2025-06-25 | 4.1800%           |
| 2025-06-26 | 4.1700%           |
| 2025-06-27 | 4.1700%           |
| 2025-06-30 | 4.1700%           |

**Beneficial/Record Owner Categories**
| Category                                            | Other Category   | Record Owner %   | Beneficial Owner %   |
|:---|:---|:---|:---|
| Depository institution or other banking institution |  | 6.8100%          | 0.0000%              |
| Depository institution or other banking institution |  | 93.0200%         | 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: FSSgAK171, C.3 - LEI: N/A, C.5 - Other ID: FSSgAK171
- **C.18 - Value (incl. sponsor support):** $11834778002.75
- **C.18.a - Value (excl. sponsor support):** $11834778002.75
- **C.19 - Percentage of Net Assets:** 100.0000%
- **C.17 - Yield as of Reporting Date:** 0.0000%
- **C.11 - Maturity Date (WAM):** 2025-07-01
- **C.12 - Maturity Date (WAL):** 2025-07-01
- **C.13 - Final Legal Maturity Date:** 2025-07-01
- **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:** 2025-07-08

**By:** /s/ Chad Hallett

**Name of Signing Officer:** Chad Hallett

**Title of Signing Officer:** Deputy Treasurer