# EDGAR Filing Document

**Accession Number:** 0001107414
**File Stem:** 0001145549-23-015142
**Filing Date:** 2023-3
**Character Count:** 5723
**Document Hash:** cc08a0471db802058aa6917a120685e0
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001145549-23-015142.hdr.sgml**: 20230307

**ACCESSION NUMBER**: 0001145549-23-015142

**CONFORMED SUBMISSION TYPE**: N-MFP2

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20230228

**FILED AS OF DATE**: 20230307

**DATE AS OF CHANGE**: 20230307

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** STATE STREET INSTITUTIONAL INVESTMENT TRUST
- **CENTRAL INDEX KEY:** 0001107414
- **IRS NUMBER:** 046910804
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** N-MFP2
- **SEC ACT:** 1940 Act
- **SEC FILE NUMBER:** 811-09819
- **FILM NUMBER:** 23711424

**BUSINESS ADDRESS:**
- **STREET 1:** STATE STREET FINANCIAL CENTER
- **STREET 2:** ONE LINCOLN STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02111
- **BUSINESS PHONE:** 6176623239

**MAIL ADDRESS:**
- **STREET 1:** ONE LINCOLN STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02111

## Series and Classes Contracts Data

### State Street Treasury Obligations Money Market Fund (Series ID: S000058519)

| Class ID   | Class Name                                          | Ticker Symbol   |
|:---|:---|:---|
| C000192374 | State Street Treasury Obligations Money Market Fund | TAQXX           |

# Form N-MFP: Monthly Schedule of Portfolio Holdings

## N-MFP: Filer Information

**Submission Type:** N-MFP2

**Live/Test Flag:** —

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

**CIK:** —

### General Information

**Report for (YYYY-MM-DD):** 2023-02-28

**EDGAR Series Identifier:** S000058519

**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:** Exempt Government

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

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

- **Total Value of Portfolio Securities:** $4712585138.76

- **Amortized Cost of Portfolio Securities:** $4712585138.76

- **Cash:** $0.00

- **Total Other Assets:** $0.00

- **Total Liabilities:** $16714509.37

- **Net Assets of Series:** $4695870629.39

- **Number of Shares Outstanding (Series):** 4695984519.42

- **Stable Price Per Share:** $1.00

- **7-Day Gross Yield:** 4.5800%

### Weekly Liquid Assets
| Period         | Daily Liquid Assets ($)   | Weekly Liquid Assets ($)   | Daily Liquid Assets (%)   | Weekly Liquid Assets (%)   |
|:---|:---|:---|:---|:---|
| Friday, Week 1 |  | $33511636688.54            |  | 99.9300%                   |
| Friday, Week 2 |  | $34167228269.99            |  | 99.9200%                   |
| Friday, Week 3 |  | $35264095551.88            |  | 99.9000%                   |
| Friday, Week 4 |  | $34889270992.61            |  | 99.9100%                   |
| Friday, Week 5 |  | $0.00                      |  | 0.0000%                    |

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

### Class: Unknown Class (—)

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

- **B.3 - Net Assets of Class:** $4695870629.39

- **B.4 - Shares Outstanding:** 4695984519.42

- **B.7.7 - 7-Day Net Yield:** 4.5000%

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

- **Expense Reimbursement/Waiver Description:** SSGA Funds Management  Management Fees 125,061

**Weekly Flows:**

| Period   | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| Week 1   | $40559362.09              | $52513135.63            |
| Week 3   | $22099.36                 | $22099.36               |
| Week 4   | $0.00                     | $125426309.00           |

**Monthly Shareholder Flow Activity:**

- **Gross Subscriptions for month:** $40581461.45

- **Gross Redemptions for month:** $147308292.70

## Part C: Schedule of Portfolio Securities

### Security 1: State Street Treasury Plus Money Market Portfolio

- **C.1 - Title:** State Street Treasury Plus Money Market Portfolio
- **C.6 - Investment Category:** Investment Company
- **Identifiers:** C.5 - Other ID: FSSgAK183
- **C.18 - Value (incl. sponsor support):** $4712585138.76
- **C.18.a - Value (excl. sponsor support):** $4712585138.76
- **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):** 2023-03-01
- **C.12 - Maturity Date (WAL):** 2023-03-01
- **C.13 - Final Legal Maturity Date:** 2023-03-01
- **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:** 2023-03-07

**By:** /s/ Chad Hallett

**Name of Signing Officer:** Chad Hallett

**Title of Signing Officer:** Deputy Treasurer