# EDGAR Filing Document

**Accession Number:** 0000816153
**File Stem:** 0001999371-26-007310
**Filing Date:** 2026-3
**Character Count:** 4914
**Document Hash:** 5b527c9e739a1825b09a3bb7646322be
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001999371-26-007310.hdr.sgml**: 20260331

**ACCESSION NUMBER**: 0001999371-26-007310

**CONFORMED SUBMISSION TYPE**: 8-A12B

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260331

**DATE AS OF CHANGE**: 20260331

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** THORNBURG INVESTMENT TRUST
- **CENTRAL INDEX KEY:** 0000816153

**ORGANIZATION NAME:**
- **EIN:** 061158764
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 0930

**FILING VALUES:**
- **FORM TYPE:** 8-A12B
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-43223
- **FILM NUMBER:** 26820051

**BUSINESS ADDRESS:**
- **STREET 1:** 2300 NORTH RIDGETOP ROAD
- **CITY:** SANTA FE
- **STATE:** NM
- **ZIP:** 87506-8361
- **BUSINESS PHONE:** 5059840200

**MAIL ADDRESS:**
- **STREET 1:** 2300 NORTH RIDGETOP ROAD
- **CITY:** SANTA FE
- **STATE:** NM
- **ZIP:** 87506-8361

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** THORNBURG INCOME TRUST
- **DATE OF NAME CHANGE:** 19920703

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** LIMITED TERM TRUST
- **DATE OF NAME CHANGE:** 19870816

**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**

**THORNBURG 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 Identification No.) |
| **2300 North Ridgetop Road**<br> **Santa Fe, NM**  | **87506** |
| (Address of Principal Executive Offices) | (Zip Code) |

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

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| | | |
|:---|:---|:---|
| Title of Each Class<br> to be so Registered | Name of the Exchange on which<br> Each Class is to be so Registered | I.R.S. Employer<br> Identification Number |
| **ETF Class shares of beneficial interest, no par value per share, of each of:**<br>**Thornburg American Opportunities Fund** | **Nasdaq Stock Market, LLC** | **85-0433925** |
| **Thornburg Focus Growth Fund** | **Nasdaq Stock Market, LLC** | **85-0474953** |

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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) or (e), 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) or (e), 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 file number to which this form relates: 33-14905

Securities to be registered pursuant to Section 12(g) of the Exchange Act: None.

**INFORMATION REQUIRED IN REGISTRATION STATEMENT**

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

A description of the ETF Class shares of each of Thornburg American Opportunities Fund and Thornburg Focus Growth Fund, each a series of Thornburg Investment Trust (the "Registrant"), is incorporated by reference to [Post-Effective Amendment No. 164 to the Registrant's registration statement on Form N-1A (the "Registration Statement"), filed with the Securities and Exchange Commission on March 27, 2026 (Files Nos. 33-14905; 811-05201)](https://www.sec.gov/ix?doc=/Archives/edgar/data/0000816153/000199937126007072/thornburg-485bpos_032726.htm). Any form of supplement to the Registration Statement that is subsequently filed is hereby also incorporated by reference herein.

**Item 2. Exhibits.**

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1. Limited Term Trust, Agreement and Declaration of Trust of the Registrant, dated June 3, 1987, is incorporated by reference to the Registration Statement filed on June 12, 1987.

2. [Eighth Supplement to Amended and Restated Designation of Series, is incorporated by reference to the Registration Statement filed on March 27, 2026](https://www.sec.gov/Archives/edgar/data/816153/000199937126007072/ex99-a42.htm) .

3. [By-laws of the Registrant, dated December 12, 2023, is incorporated by reference to the Registration Statement filed on January 29, 2024](https://www.sec.gov/Archives/edgar/data/816153/000199937124001120/ex-99b.htm) .

**SIGNATURE**

Pursuant to the requirements of Section 12 of the Securities Exchange Act of 1934, the Registrant has duly caused this registration statement on Form 8-A to be signed on its behalf by the undersigned, thereto duly authorized, as of March 31, 2026.

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| | |
|:---|:---|
| Thornburg Investment Trust | Thornburg Investment Trust |
| By: | /s/ Curtis Holloway |
| Name: | Curtis Holloway |
| Title: | Chief Financial Officer and Treasurer |

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