# EDGAR Filing Document

**Accession Number:** 0001107414
**File Stem:** 0001410368-26-020005
**Filing Date:** 2026-2
**Character Count:** 7701
**Document Hash:** dec1b169e428e63d0d83b1ca130ad5c4
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001410368-26-020005.hdr.sgml**: 20260226

**ACCESSION NUMBER**: 0001410368-26-020005

**CONFORMED SUBMISSION TYPE**: NPORT-P

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20251231

**FILED AS OF DATE**: 20260226

**DATE AS OF CHANGE**: 20260226

**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:** 26689791

**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 Target Retirement 2035 Fund (Series ID: S000046038)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000143876 | Class I      | SSCJX           |
| C000143877 | Class K      | SSCKX           |
| C000232297 | Class R3     | SSAZX           |

## 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 Congress Street

  - **City:** Boston

  - **State:** MA

  - **Foreign country:** US

  - **Zip / Postal Code:** 02114

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

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

- **a. Name of Series:** State Street Target Retirement 2035 Fund

- **b. EDGAR series identifier (if any):** S000046038

- **c. LEI of Series:** 549300YYYQVBSQQ8DW95

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

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

- **b. Date as of which information is reported:** 2025-12-31

**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:** $3685021737.98

**Total Liabilities:** $163296042.15

**Net Assets:** $3521725695.83

**Monthly Return Information**

| Class               | Month 1 Return (%)   | Month 2 Return (%)   | Month 3 Return (%)   |
|:---|:---|:---|:---|
| Class ID C000143876 | 1.59%                | 0.25%                | 0.50%                |
| Class ID C000143877 | 1.57%                | 0.31%                | 0.57%                |
| Class ID C000232297 | 1.51%                | 0.25%                | 0.57%                |

**Monthly Gains & Losses**

| Period   | Net Realized Gain/Loss   | Net Unrealized Appreciation/Depreciation   |
|:---|:---|:---|
| Month 1  | $18417208.18             | $30999665.61                               |
| Month 2  | $1893386.12              | $4426833.52                                |
| Month 3  | $5791133.71              | $-59216435.96                              |

### 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   |
|:---|:---|:---|:---|:---|:---|:---|---:|:---|:---|:---|:---|:---|:---|:---|---:|:---|
| State Street Global Advisors                               | State Street Navigator Securities Lending Portfolio II     | CUSIP: 857492706<br>LEI: 5493008BJIBKQ5KTIF74 | Long             | STIV             | RF                | US        | 133551800 | NS      | $133551800.00  | 3.79%             |  |  |  | No            |                  1 | On Loan: No      |
| SPDR Dow Jones Global Real Estate ETF                      | SPDR Dow Jones Global Real Estate ETF                      | CUSIP: 78463X749<br>LEI: 549300NEMKJTY73KOC44 | Long             | EC               | RF                | US        |    388203 | NS      | $17476899.06   | 0.50%             |  |  |  | No            |                  1 | On Loan: —       |
| State Street SPDR Portfolio Long Term Treasury ETF         | State Street SPDR Portfolio Long Term Treasury ETF         | CUSIP: 78464A664<br>LEI: 549300GYQKAMF6JUVI06 | Long             | EC               | RF                | US        |  11673929 | NS      | $309008900.63  | 8.77%             |  |  |  | No            |                  1 | On Loan: —       |
| State Street SPDR Bloomberg High Yield Bond ETF            | State Street SPDR Bloomberg High Yield Bond ETF            | CUSIP: 78468R622<br>LEI: 549300NCLW2248PN7J24 | Long             | EC               | RF                | US        |   1846963 | NS      | $179543273.23  | 5.10%             |  |  |  | No            |                  1 | On Loan: —       |
| State Street SPDR Bloomberg 1-10 Year TIPS ETF             | State Street SPDR Bloomberg 1-10 Year TIPS ETF             | CUSIP: 78468R861<br>LEI: 549300SS31WHLX0B1I97 | Long             | EC               | RF                | US        |   3676006 | NS      | $70138194.48   | 1.99%             |  |  |  | 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        |    626884 | NS      | $207993771.03  | 5.91%             |  |  |  | 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        |   1902247 | NS      | $1171688855.48 | 33.27%            |  |  |  | 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        |   7028170 | NS      | $1035319724.32 | 29.40%            |  |  |  | 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        |   6138502 | NS      | $552342366.86  | 15.68%            |  |  |  | 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        |   7125380 | NS      | $7125380.19    | 0.20%             |  |  |  | No            |                  1 | On Loan: No      |

### Signature

**Date Signed:** 2026-01-16

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

**Signature:** Arthur Jensen

**Name of Signer:** Arthur Jensen

**Title:** Deputy Treasurer