# EDGAR Filing Document

**Accession Number:** 0001107414
**File Stem:** 0001752724-25-211091
**Filing Date:** 2025-8
**Character Count:** 6948
**Document Hash:** a1c7fdfafc6698ef1b9dda7a4178334d
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001752724-25-211091.hdr.sgml**: 20250828

**ACCESSION NUMBER**: 0001752724-25-211091

**CONFORMED SUBMISSION TYPE**: NPORT-P

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20250630

**FILED AS OF DATE**: 20250828

**DATE AS OF CHANGE**: 20250828

**PERIOD START**: 20251231

**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:** NPORT-P
- **SEC ACT:** 1940 Act
- **SEC FILE NUMBER:** 811-09819
- **FILM NUMBER:** 251270075

**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 Target Retirement 2050 Fund (Series ID: S000046023)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000143828 | Class I      | SSDJX           |
| C000143829 | Class K      | SSDLX           |
| C000232290 | Class R3     | SSAUX           |

## Form NPORT-P: Monthly Portfolio Investments Report

### NPORT-P: Part A: General Information

**Item A.1. Information about the Registrant.**

- **a. Name of Registrant:** STATE STREET INSTITUTIONAL INVESTMENT TRUST

- **b. Investment Company Act file number:** 811-09819

- **c. CIK number of Registrant:** 0001107414

- **d. LEI of Registrant:** 549300P1E098W6ES7M39

- **e. Address and telephone number of Registrant.**

  - **Street Address 1:** One Iron Street

  - **City:** Boston

  - **State:** MA

  - **Foreign country:** US

  - **Zip / Postal Code:** 02210

  - **Telephone number:** 617-664-7037

**Item A.2. Information about the Series.**

- **a. Name of Series:** State Street Target Retirement 2050 Fund

- **b. EDGAR series identifier (if any):** S000046023

- **c. LEI of Series:** 5493003L8ILSK8AYZ070

**Item A.3. Reporting period.**

- **a. Date of fiscal year-end:** 2025-12-31

- **b. Date as of which information is reported:** 2025-06-30

**Item A.4. Final filing**

Does the Fund anticipate that this will be its final filing on Form N-PORT? **No**

### Fund Information

**Total Assets:** $2489618155.72

**Total Liabilities:** $30241966.41

**Net Assets:** $2459376189.31

**Monthly Return Information**

| Class               | Month 1 Return (%)   | Month 2 Return (%)   | Month 3 Return (%)   |
|:---|:---|:---|:---|
| Class ID C000232290 | 0.73%                | 4.70%                | 4.24%                |
| Class ID C000143828 | 0.74%                | 4.76%                | 4.28%                |
| Class ID C000143829 | 0.80%                | 4.77%                | 4.30%                |

**Monthly Gains & Losses**

| Period   | Net Realized Gain/Loss   | Net Unrealized Appreciation/Depreciation   |
|:---|:---|:---|
| Month 1  | $2393878.37              | $14881535.16                               |
| Month 2  | $1507068.04              | $103863914.17                              |
| Month 3  | $1299756.93              | $98429532.98                               |

### Schedule of Portfolio Investments

| Name                                                       | Title                                                      | Identifiers                                   | Payoff Profile   | Asset Category   | Issuer Category   | Country   |   Balance | Units   | Value (USD)   | % of Net Assets   | Maturity Date   | Coupon Type   | Annualized Rate (%)   | Restricted?   |   Fair Value Level | Lending Status   |
|:---|:---|:---|:---|:---|:---|:---|---:|:---|:---|:---|:---|:---|:---|:---|---:|:---|
| SPDR Portfolio Long Term Treasury ETF                      | SPDR Portfolio Long Term Treasury ETF                      | CUSIP: 78464A664<br>LEI: 549300GYQKAMF6JUVI06 | Long             | EC               | RF                | US        |   9075038 | NS      | $241214510.04 | 9.81%             |  |  |  | No            |                  1 | On Loan: —       |
| State Street Small/Mid Cap Equity Index Portfolio          | State Street Small/Mid Cap Equity Index Portfolio          | CUSIP: 85749T707<br>LEI: 54930001FXUIVS800B48 | Long             | EC               | RF                | US        |    917385 | NS      | $297278516.25 | 12.09%            |  |  |  | No            |                  1 | On Loan: No      |
| State Street Global Advisors                               | State Street Navigator Securities Lending Portfolio II     | CUSIP: 857492706<br>LEI: 5493008BJIBKQ5KTIF74 | Long             | STIV             | RF                | US        |   4031100 | NS      | $4031100.00   | 0.16%             |  |  |  | No            |                  1 | On Loan: No      |
| State Street Equity 500 Index II Portfolio                 | State Street Equity 500 Index II Portfolio                 | CUSIP: 85749T756<br>LEI: 549300IDK82VZN2AFK60 | Long             | EC               | RF                | US        |   1690516 | NS      | $953687431.66 | 38.78%            |  |  |  | No            |                  1 | On Loan: No      |
| State Street Global Advisors                               | State Street Institutional US Government Money Market Fund | CUSIP: 857492706<br>LEI: 549300BZ5TGIFZUZDZ37 | Long             | STIV             | RF                | US        |   1005942 | NS      | $1005942.21   | 0.04%             |  |  |  | No            |                  1 | On Loan: No      |
| State Street Aggregate Bond Index Portfolio                | State Street Aggregate Bond Index Portfolio                | CUSIP: 85749T772<br>LEI: 549300CYRPLDVB2ZTF93 | Long             | EC               | RF                | US        |    566924 | NS      | $50711320.31  | 2.06%             |  |  |  | No            |                  1 | On Loan: No      |
| State Street Global All Cap Equity ex-U.S. Index Portfolio | State Street Global All Cap Equity ex-U.S. Index Portfolio | CUSIP: 85749T764<br>LEI: 5493006RH3PQC41AJP68 | Long             | EC               | RF                | US        |   6894983 | NS      | $936890239.09 | 38.09%            |  |  |  | No            |                  1 | On Loan: No      |
| State Street Global Advisors                               | State Street Institutional US Government Money Market Fund | CUSIP: 857492706<br>LEI: 549300BZ5TGIFZUZDZ37 | Long             | STIV             | RF                | US        |   4780905 | NS      | $4780904.68   | 0.19%             |  |  |  | No            |                  1 | On Loan: No      |

### Signature

**Date Signed:** 2025-07-29

**Name of Applicant:** STATE STREET INSTITUTIONAL INVESTMENT TRUST

**Signature:** Arthur Jensen

**Name of Signer:** Arthur Jensen

**Title:** Deputy Treasurer