# EDGAR Filing Document

**Accession Number:** 0001107414
**File Stem:** 0001193125-26-038649
**Filing Date:** 2026-2
**Character Count:** 4621
**Document Hash:** 7c11a1d30c39ad965af16ed31d2c7cbf
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-038649.hdr.sgml**: 20260205

**ACCESSION NUMBER**: 0001193125-26-038649

**CONFORMED SUBMISSION TYPE**: 8-A12B

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260205

**DATE AS OF CHANGE**: 20260205

**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:** 8-A12B
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-43104
- **FILM NUMBER:** 26600950

**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

**UNITED STATES** 

**SECURITIES AND EXCHANGE COMMISSION** 

**Washington, D.C. 20549** 

**FORM 8-A** 

**FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES** 

**PURSUANT TO SECTION 12(b) OR (g) OF** 

**THE SECURITIES EXCHANGE ACT OF 1934** 

## STATE STREET INSTITUTIONAL INVESTMENT TRUST
**(Exact name of registrant as specified in its charter)** 

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| | |
|:---|:---|
| **Massachusetts** | **See Below** |
| **(State of incorporation or organization)** | **(I.R.S. Employer**<br> **Identification number)** |
| **One Congress Street, Boston, Massachusetts** | **02114** |
| **(Address of principal executive offices)** | **(Zip Code)** |

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**Securities to be registered pursuant to Section 12(b) of the Exchange Act:** 

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| | | |
|:---|:---|:---|
| **Title of Each Class**<br> **to be Registered** | **Name of the Exchange on Which**<br> **Each Class is to be so Registered** | **I.R.S. Employer**<br> **Identification Number** |
| **State Street<sup>®</sup> Prime Money Market ETF** | **New York Stock Exchange LLC** | **39-5109870** |

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If this form relates to the registration of a class of securities pursuant to Section 12(b) of the Exchange Act and is effective pursuant to General Instruction A.(c), check the following box: ☒

If this form relates to the registration of a class of securities pursuant to Section 12(g) of the Exchange Act and is effective pursuant to General Instruction A.(d), check the following box: ☐

If this form relates to the registration of a class of securities concurrently with a Regulation A offering, check the following box: ☐

Securities Act registration statement or Regulation A offering statement file number to which this form relates: 333-30810

**Securities to be registered pursuant to Section 12(g) of the Act:** 

**_** 

**(Title of class)** 

**_** 

**(Title of class)** 

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**Item 1.** **Description of Registrant's Securities to be Registered** <br>

[A description of the Shares is set forth in the registrant's Registration Statement on Form N-1A ("Registration Statement") (Commission File Nos. 333-30810; 811-09819), which description is incorporated herein by reference as filed with the Securities and Exchange Commission on February 5, 2026.](http://www.sec.gov/Archives/edgar/data/../../../ix?doc=/Archives/edgar/data/1107414/000119312526038029/d81493d485bpos.htm) Any form of supplement to the Registration Statement that is subsequently filed that relates to the Shares is hereby also incorporated by reference herein.

**Item 2.** **Exhibits** <br>

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| | |
|:---|:---|
|  (a)(1) | [Second Amended and Restated Agreement and Declaration of Trust dated September 11, 2025, is incorporated herein by reference to Post-Effective Amendment No. 313 to the Trust's Registration Statement on Form N-1A, as filed with the Commission on October 20, 2025.](http://www.sec.gov/Archives/edgar/data/1107414/000119312525243706/d35390dex99a1.htm) |
|  (b)(1) | [Amended and Restated By-Laws dated February 20, 2025, are incorporated herein by reference to the Post-Effective Amendment No. 137 to the Trust's Registration Statement on Form N-1A, as filed with the Commission on August 28, 2015.](http://www.sec.gov/Archives/edgar/data/1107414/000119312515305240/d10786dex99b3.htm) |
| (c) | Not applicable. |

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**SIGNATURE** 

Pursuant to the requirements of Section 12 of the Securities Exchange Act of 1934, the Registrant has duly caused this registration statement to be signed on its behalf by the undersigned, thereto duly authorized.

**SPDR SERIES TRUST** 

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| | |
|:---|:---|
| Date: February 5, 2026 | Date: February 5, 2026 |
| By: | /s/ Edmund Gerard Maiorana, Jr. |
|  | Edmund Gerard Maiorana, Jr. |
|  | Attorney-in-Fact |

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