# EDGAR Filing Document

**Accession Number:** 0000816153
**File Stem:** 0001999371-26-007314
**Filing Date:** 2026-3
**Character Count:** 3005
**Document Hash:** c63fa66d067250a090ba2304e3d31c43
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001999371-26-007314.hdr.sgml**: 20260331

**ACCESSION NUMBER**: 0001999371-26-007314

**CONFORMED SUBMISSION TYPE**: 497J

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20260331

**DATE AS OF CHANGE**: 20260331

**EFFECTIVENESS DATE**: 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:** 497J
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-14905
- **FILM NUMBER:** 26820128

**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

## Series and Classes Contracts Data

### Thornburg American Opportunities Fund (Series ID: S000011846)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000272858 | ETF Class    | TAOZ            |

### Thornburg Focus Growth Fund (Series ID: S000011850)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000272859 | ETF Class    | TFGZ            |

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| ![](thornburg497j001.jpg) | &nbsp;&nbsp;&nbsp;ROPES & GRAY LLP<br> PRUDENTIAL TOWER<br> 800 BOYLSTON STREET<br> BOSTON, MA 02199-3600<br> WWW.ROPESGRAY.COM |

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Ali R. Olia T +1 617 951 7204 Ali.Olia@ropesgray.com

March 31, 2026

<u>BY EDGAR</u>

Securities and Exchange Commission

Division of Investment Management

100 F Street, N.E.

Washington, D.C. 20549

Re: Thornburg Investment Trust (the "Registrant")

(Registration Nos. 33-14905 and 811-05201)

Ladies and Gentlemen:

Pursuant to Rule 497(j) under the Securities Act of 1933, as amended (the "Securities Act"), the undersigned has been authorized by the Registrant to submit this filing in lieu of a filing under Rule 497(c) under the Securities Act, and to certify that: (a) that the forms of prospectus and statement of additional information used with respect to the ETF Class shares of each of Thornburg American Opportunities Fund (formerly, Thornburg Small/Mid Cap Core Fund) and Thornburg Focus Growth Fund (formerly, Thornburg Small/Mid Cap Growth Fund), each a series of the Registrant, do not differ from those contained in Post-Effective Amendment No. 164 to the Registrant's Registration Statement under the Securities Act ("Amendment No. 164"); and (b) Amendment No. 164 was filed electronically.

Any questions or comments regarding this matter should be directed to the undersigned at (617) 951-7204.

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| Very truly yours, |
| /s/ Ali R. Olia |
| Ali R. Olia |

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