# EDGAR Filing Document

**Accession Number:** 0000816153
**File Stem:** 0001387131-23-001177
**Filing Date:** 2023-2
**Character Count:** 7741
**Document Hash:** 5564428614579dc79e58353eff211445
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001387131-23-001177.hdr.sgml**: 20230201

**ACCESSION NUMBER**: 0001387131-23-001177

**CONFORMED SUBMISSION TYPE**: 497J

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20230201

**DATE AS OF CHANGE**: 20230201

**EFFECTIVENESS DATE**: 20230201

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** THORNBURG INVESTMENT TRUST
- **CENTRAL INDEX KEY:** 0000816153
- **IRS NUMBER:** 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:** 23575767

**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 Limited Term U.S. Government Fund (Series ID: S000011842)

| Class ID   | Class Name                                             | Ticker Symbol   |
|:---|:---|:---|
| C000042666 | Thornburg Limited Term U.S. Government Fund - Class R3 | LTURX           |
| C000113847 | Thornburg Limited Term U.S. Government Fund - Class R5 | LTGRX           |
| C000136848 | Thornburg Limited Term U.S. Government Fund - Class R4 | LTUGX           |

### Thornburg Limited Term Income Fund (Series ID: S000011845)

| Class ID   | Class Name                                    | Ticker Symbol   |
|:---|:---|:---|
| C000042668 | Thornburg Limited Term Income Fund - Class R3 | THIRX           |
| C000113848 | Thornburg Limited Term Income Fund - Class R5 | THRRX           |
| C000136849 | Thornburg Limited Term Income Fund - Class R4 | THRIX           |
| C000177478 | Thornburg Limited Term Income Fund - Class R6 | THRLX           |

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

| Class ID   | Class Name                                   | Ticker Symbol   |
|:---|:---|:---|
| 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 International Equity Fund (Series ID: S000011849)

| Class ID   | Class Name                                     | Ticker Symbol   |
|:---|:---|:---|
| C000032374 | Thornburg International Equity Fund - Class R5 | TIVRX           |
| C000042671 | Thornburg International Equity Fund - Class R4 | THVRX           |
| C000042672 | Thornburg International Equity Fund - Class R3 | TGVRX           |
| C000113849 | Thornburg International Equity Fund - Class R6 | TGIRX           |

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

| Class ID   | Class Name                                     | Ticker Symbol   |
|:---|:---|:---|
| 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           |

### Thornburg Investment Income Builder Fund (Series ID: S000011851)

| Class ID   | Class Name                                          | Ticker Symbol   |
|:---|:---|:---|
| C000042675 | Thornburg Investment Income Builder Fund - Class R3 | TIBRX           |
| C000047041 | Thornburg Investment Income Builder Fund - Class R5 | TIBMX           |
| C000058461 | Thornburg Investment Income Builder Fund - Class R4 | TIBGX           |
| C000177479 | Thornburg Investment Income Builder Fund - Class R6 | TIBOX           |

### Thornburg Global Opportunities Fund (Series ID: S000012859)

| Class ID   | Class Name                                     | Ticker Symbol   |
|:---|:---|:---|
| C000058462 | Thornburg Global Opportunities Fund - Class R3 | THORX           |
| C000058463 | Thornburg Global Opportunities Fund - Class R4 | THOVX           |
| C000058464 | Thornburg Global Opportunities Fund - Class R5 | THOFX           |
| C000177480 | Thornburg Global Opportunities Fund - Class R6 | THOGX           |

### Thornburg International Growth Fund (Series ID: S000015648)

| Class ID   | Class Name                                     | Ticker Symbol   |
|:---|:---|:---|
| C000058465 | Thornburg International Growth Fund - Class R3 | TIGVX           |
| C000058466 | Thornburg International Growth Fund - Class R4 | TINVX           |
| C000058467 | Thornburg International Growth Fund - Class R5 | TINFX           |
| C000123223 | Thornburg International Growth Fund - Class R6 | THGIX           |

### Thornburg Strategic Income Fund (Series ID: S000020097)

| Class ID   | Class Name                                 | Ticker Symbol   |
|:---|:---|:---|
| C000113850 | Thornburg Strategic Income Fund - Class R3 | TSIRX           |
| C000113851 | Thornburg Strategic Income Fund - Class R5 | TSRRX           |
| C000136850 | Thornburg Strategic Income Fund - Class R4 | TSRIX           |
| C000177481 | Thornburg Strategic Income Fund - Class R6 | TSRSX           |

### Thornburg Developing World Fund (Series ID: S000027135)

| Class ID   | Class Name                               | Ticker Symbol   |
|:---|:---|:---|
| C000123224 | Thornburg Developing World Fund Class R5 | THDRX           |
| C000123225 | Thornburg Developing World Fund Class R6 | TDWRX           |

![](tbit-497j_logo.jpg)

Attorneys and Counselors at Law

---

| | | |
|:---|:---|:---|
| Daniel H. April |  | *Of Counsel* |
| Patrick J. Dolan |  | David F. Cunningham |
| Megan H. Koehler |  |  |
|  | February 1, 2023 |  |
|  |  | **<u>VIA EDGAR</u>** |

---

U.S. Securities and Exchange Commission

100 F Street N.E.

Washington, D.C. 20549

---

| | |
|:---|:---|
| ***Re:*** | **Thornburg Investment Trust (the "Trust" or "Registrant")** |
|  | **File Nos. 33-14905/811-05201** |
|  | **Filing pursuant to Rule 497(j)** |

---

Ladies and Gentlemen:

On behalf of the Trust, in accordance with the provisions of rule 497(j) under the Securities Act of 1933, as amended (the "Securities Act"), we hereby certify that the forms of the February 1, 2023 Thornburg Funds Retirement Plan Shares (Classes R3, R4, R5, and R6) Prospectus and Statement of Additional Information, applicable to each series of the Registrant offering such share classes, that would have been filed pursuant to rule 497(c) under the Securities Act would not have differed from those contained in Post-Effective Amendment No. 148 to the Trust's Registration Statement under the Securities Act and Amendment No. 163 to the Trust's Registration Statement under the Investment Company Act of 1940, as amended, which was filed electronically via EDGAR on January 30, 2023 (Accession No. 0001387131-23-001018).

The February 1, 2023 Thornburg Funds Retail and Institutional Shares (Classes A, C, C2, D, and I) Prospectus and Statement of Additional Information applicable to each series of the Trust offering such share classes were filed electronically via EDGAR in accordance with rule 497(c) on February 1, 2023 (Accession No. 0001387131-23-001155).

Please contact me or Daniel April with any questions.

---

| |
|:---|
| Sincerely, |
| /s/ Megan H. Koehler |
| Megan H. Koehler |

---

460 St. Michael's Drive E-mail: mkoehler@catchlaw.com Tel.: (505) 988-2900 <br> Suite 603 Web address: www.catchlaw.com Extension 108 <br> Santa Fe, New Mexico 87505 Fax: (505) 988-2901