# EDGAR Filing Document

**Accession Number:** 0001107414
**File Stem:** 0001410368-26-020106
**Filing Date:** 2026-2
**Character Count:** 8565
**Document Hash:** 14d47cc5618f6f067b9c9284c4985e42
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001410368-26-020106.hdr.sgml**: 20260226

**ACCESSION NUMBER**: 0001410368-26-020106

**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:** 26689973

**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 Fund (Series ID: S000046033)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000143856 | Class I      | SSFNX           |
| C000143857 | Class K      | SSFOX           |
| C000232293 | Class R3     | SSFQX           |

## 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 Fund

- **b. EDGAR series identifier (if any):** S000046033

- **c. LEI of Series:** 549300QZZ27SPBKTJG32

**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:** $1537470836.45

**Total Liabilities:** $44822275.99

**Net Assets:** $1492648560.46

**Monthly Return Information**

| Class               | Month 1 Return (%)   | Month 2 Return (%)   | Month 3 Return (%)   |
|:---|:---|:---|:---|
| Class ID C000143856 | 0.68%                | 0.68%                | 0.07%                |
| Class ID C000143857 | 0.77%                | 0.59%                | 0.22%                |
| Class ID C000232293 | 0.68%                | 0.59%                | 0.15%                |

**Monthly Gains & Losses**

| Period   | Net Realized Gain/Loss   | Net Unrealized Appreciation/Depreciation   |
|:---|:---|:---|
| Month 1  | $4441827.30              | $3213059.96                                |
| Month 2  | $603705.30               | $4984781.25                                |
| Month 3  | $99418.32                | $-17455195.37                              |

### 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        |  34353825 | NS      | $34353825.00  | 2.30%             |  |  |  | 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        |   1633989 | NS      | $73562184.78  | 4.93%             |  |  |  | No            |                  1 | On Loan: —       |
| State Street SPDR Portfolio Short Term Corporate Bond ETF        | State Street SPDR Portfolio Short Term Corporate Bond ETF        | CUSIP: 78464A474<br>LEI: 549300D2BO7L1J2SO973 | Long             | EC               | RF                | US        |   1973326 | NS      | $59594445.20  | 3.99%             |  |  |  | No            |                  1 | On Loan: —       |
| State Street SPDR Portfolio Short Term Treasury ETF              | State Street SPDR Portfolio Short Term Treasury ETF              | CUSIP: 78468R101<br>LEI: 549300CVHDNMTIUMZ693 | Long             | EC               | RF                | US        |   8037679 | NS      | $235343241.12 | 15.77%            |  |  |  | No            |                  1 | On Loan: —       |
| SPDR Bloomberg Enhanced Roll Yield Commodity Strategy NO K-1 ETF | SPDR Bloomberg Enhanced Roll Yield Commodity Strategy NO K-1 ETF | CUSIP: 78468R440<br>LEI: 984500D58F9EV0X92F27 | Long             | EC               | RF                | US        |   1799811 | NS      | $51384604.05  | 3.44%             |  |  |  | No            |                  1 | On Loan: No      |
| 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        |   1072083 | NS      | $104217188.43 | 6.98%             |  |  |  | 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        |  14032311 | NS      | $267736493.88 | 17.94%            |  |  |  | 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        |     73031 | NS      | $24230813.82  | 1.62%             |  |  |  | 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        |    361301 | NS      | $222543256.71 | 14.91%            |  |  |  | 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        |   1056035 | NS      | $155564488.30 | 10.42%            |  |  |  | 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        |   3300368 | NS      | $296967097.07 | 19.90%            |  |  |  | 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        |   7563959 | NS      | $7563958.95   | 0.51%             |  |  |  | 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