# EDGAR Filing Document

**Accession Number:** 0000816153
**File Stem:** 0001999371-26-000952
**Filing Date:** 2026-1
**Character Count:** 3632
**Document Hash:** 501c6e63f39f2249153b327e4fbbc61a
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001999371-26-000952.hdr.sgml**: 20260115

**ACCESSION NUMBER**: 0001999371-26-000952

**CONFORMED SUBMISSION TYPE**: 497J

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20260115

**DATE AS OF CHANGE**: 20260115

**EFFECTIVENESS DATE**: 20260115

**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:** 26535448

**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 Small/Mid Cap Core Fund (Series ID: S000011846)

| Class ID   | Class Name                                   | Ticker Symbol   |
|:---|:---|:---|
| C000032361 | Thornburg Small/Mid Cap Core Fund - Class A  | TVAFX           |
| C000032363 | Thornburg Small/Mid Cap Core Fund - Class C  | TVCFX           |
| C000032364 | Thornburg Small/Mid Cap Core Fund - Class I  | TVIFX           |
| C000032366 | Thornburg Small/Mid Cap Core Fund - Class R5 | TVRRX           |
| C000042669 | Thornburg Small/Mid Cap Core Fund - Class R4 | TVIRX           |
| C000042670 | Thornburg Small/Mid Cap Core Fund - Class R3 | TVRFX           |

### Thornburg Small/Mid Cap Growth Fund (Series ID: S000011850)

| Class ID   | Class Name                                     | Ticker Symbol   |
|:---|:---|:---|
| C000032375 | Thornburg Small/Mid Cap Growth Fund - Class A  | THCGX           |
| C000032376 | Thornburg Small/Mid Cap Growth Fund - Class C  | TCGCX           |
| C000032377 | Thornburg Small/Mid Cap Growth Fund - Class I  | THIGX           |
| C000032379 | Thornburg Small/Mid Cap Growth Fund - Class R5 | THGRX           |
| C000042673 | Thornburg Small/Mid Cap Growth Fund - Class R4 | TCGRX           |
| C000042674 | Thornburg Small/Mid Cap Growth Fund - Class R3 | THCRX           |

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January 15, 2026 Ali R. Olia T +1 617 951 7204 Ali.Olia@ropesgray.com

<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") <br> (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 (a) that the forms of prospectus and statement of additional information used with respect to Thornburg Small/Mid Cap Core Fund and Thornburg Small/Mid Cap Growth Fund, each a series of the Registrant, do not differ from those contained in Post-Effective Amendment No. 160 to the Registrant's Registration Statement ("Amendment No. 160"), and (b) that Amendment No. 160 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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