# EDGAR Filing Document

**Accession Number:** 0001107414
**File Stem:** 0001410368-25-038166
**Filing Date:** 2025-12
**Character Count:** 3621
**Document Hash:** ac0002bbbad18addf539c7427c5e074f
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001410368-25-038166.hdr.sgml**: 20251217

**ACCESSION NUMBER**: 0001410368-25-038166

**CONFORMED SUBMISSION TYPE**: 24F-2NT

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20250930

**FILED AS OF DATE**: 20251217

**DATE AS OF CHANGE**: 20251217

**EFFECTIVENESS DATE**: 20251217

**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:** 24F-2NT
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-30810
- **FILM NUMBER:** 251577816

**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 Income Fund (Series ID: S000071465)

---

|  |  |  |
|:---|:---|:---|
| Class Name               | Ticker Symbol | Class ID   |
| State Street Income Fund | SSASX         | C000226666 |

---

### State Street U.S. Core Equity Fund (Series ID: S000071466)

---

|  |  |  |
|:---|:---|:---|
| Class Name                         | Ticker Symbol | Class ID   |
| State Street U.S. Core Equity Fund | SSAQX         | C000226667 |

---

## Series and Classes Contracts Data

### State Street Income Fund (Series ID: S000071465)

| Class ID   | Class Name               | Ticker Symbol   |
|:---|:---|:---|
| C000226666 | State Street Income Fund | SSASX           |

### State Street U.S. Core Equity Fund (Series ID: S000071466)

| Class ID   | Class Name                         | Ticker Symbol   |
|:---|:---|:---|
| C000226667 | State Street U.S. Core Equity Fund | SSAQX           |

## FORM 24F-2NT: Annual Notice of Securities Sold Pursuant to Rule 24f-2

### 24F-2NT: Filer Information

**Filer CIK:** 0001107414

**Is this a LIVE or TEST Filing?:** LIVE

**Filer Investment Company Type:** N-1A

### 24F-2NT: Annual Filing Information

**1. Name and address of issuer:**

- **Name of Issuer:** State Street Institutional Investment Trust

- **Address:** ONE CONGRESS STREET, BOSTON, MA 02114

**2. The Name and EDGAR Identifier of each series or class of securities for which this Form is filed:**

- [ ] Check box if the Form is being filed for all series and classes of the issuer.

**3. Investment Company Act File Number:** 811-09819

   **Securities Act File Number:** 333-30810

**4(a). Last day of fiscal year for which this Form is filed:** 09/30/2025

**4(b). Check box if this Form is being filed late:** [ ]

**4(c). Check box if this is the last time the issuer will be filing this Form:** [ ]

**5. Calculation of registration fee:**

- **(i) Aggregate sale price of securities sold during the fiscal year:** $976670772.00

- **(ii) Aggregate price of securities redeemed or repurchased during the fiscal year:** $1827717783.00

- **(iii) Aggregate price of securities redeemed or repurchased during any prior fiscal year:** $2553034819.00

- **(iv) Total available redemption credits [add Items 5(ii) and 5(iii)]:** $4380752602.00

- **(v) Net sales:** $0.00

- **(vi) Redemption credits available for use in future years:** $-3404081830.00

- **(vii) Multiplier for determining registration fee:** 0.0001381

- **(viii) Registration fee due:** $0.00

**Signatures**

**Name and Title:** John Bettencourt, Assistant Treasurer

**Date:** 12/16/2025

**Signature:** /s/John Bettencourt