# EDGAR Filing Document

**Accession Number:** 0000816153
**File Stem:** 0001410368-25-038848
**Filing Date:** 2025-12
**Character Count:** 28496
**Document Hash:** 1b3da5d7f3a5d81898b20c186f5d0c95
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001410368-25-038848.hdr.sgml**: 20251218

**ACCESSION NUMBER**: 0001410368-25-038848

**CONFORMED SUBMISSION TYPE**: 24F-2NT

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20250930

**FILED AS OF DATE**: 20251218

**DATE AS OF CHANGE**: 20251218

**EFFECTIVENESS DATE**: 20251218

**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:** 24F-2NT
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-14905
- **FILM NUMBER:** 251582125

**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 Municipal Fund (Series ID: S000000540)

---

|  |  |  |
|:---|:---|:---|
| Class Name                                       | Ticker Symbol | Class ID   |
| Thornburg Limited Term Municipal Fund - Class A  | LTMFX         | C000001427 |
| Thornburg Limited Term Municipal Fund - Class C  | LTMCX         | C000001438 |
| Thornburg Limited Term Municipal Fund - Class I  | LTMIX         | C000001449 |
| Thornburg Limited Term Municipal Fund - Class C2 | LTMQX         | C000222321 |

---

### Thornburg California Limited Term Municipal Fund (Series ID: S000011841)

---

|  |  |  |
|:---|:---|:---|
| Class Name                                                  | Ticker Symbol | Class ID   |
| Thornburg California Limited Term Municipal Fund - Class A  | LTCAX         | C000032344 |
| Thornburg California Limited Term Municipal Fund - Class C  | LTCCX         | C000032345 |
| Thornburg California Limited Term Municipal Fund - Class I  | LTCIX         | C000032346 |
| Thornburg California Limited Term Municipal Fund - Class C2 | LTCQX         | C000222322 |

---

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

---

|  |  |  |
|:---|:---|:---|
| Class Name                                             | Ticker Symbol | Class ID   |
| Thornburg Limited Term U.S. Government Fund - Class A  | LTUSX         | C000032347 |
| Thornburg Limited Term U.S. Government Fund - Class C  | LTUCX         | C000032349 |
| Thornburg Limited Term U.S. Government Fund - Class I  | LTUIX         | C000032350 |
| Thornburg Limited Term U.S. Government Fund - Class R3 | LTURX         | C000042666 |
| Thornburg Limited Term U.S. Government Fund - Class R5 | LTGRX         | C000113847 |
| Thornburg Limited Term U.S. Government Fund - Class R4 | LTUGX         | C000136848 |
| Thornburg Limited Term U.S. Government Fund - Class C2 | LTUQX         | C000222323 |

---

### Thornburg New Mexico Intermediate Municipal Fund (Series ID: S000011843)

---

|  |  |  |
|:---|:---|:---|
| Class Name                                                 | Ticker Symbol | Class ID   |
| Thornburg New Mexico Intermediate Municipal Fund - Class A | THNMX         | C000032352 |
| Thornburg New Mexico Intermediate Municipal Fund - Class D | THNDX         | C000032353 |
| Thornburg New Mexico Intermediate Municipal Fund - Class I | THNIX         | C000042667 |

---

### Thornburg Intermediate Municipal Fund (Series ID: S000011844)

---

|  |  |  |
|:---|:---|:---|
| Class Name                                       | Ticker Symbol | Class ID   |
| Thornburg Intermediate Municipal Fund - Class A  | THIMX         | C000032354 |
| Thornburg Intermediate Municipal Fund - Class C  | THMCX         | C000032355 |
| Thornburg Intermediate Municipal Fund - Class I  | THMIX         | C000032356 |
| Thornburg Intermediate Municipal Fund - Class C2 | THMQX         | C000222324 |

---

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

---

|  |  |  |
|:---|:---|:---|
| Class Name                                    | Ticker Symbol | Class ID   |
| Thornburg Limited Term Income Fund - Class A  | THIFX         | C000032357 |
| Thornburg Limited Term Income Fund - Class C  | THICX         | C000032358 |
| Thornburg Limited Term Income Fund - Class I  | THIIX         | C000032359 |
| Thornburg Limited Term Income Fund - Class R3 | THIRX         | C000042668 |
| Thornburg Limited Term Income Fund - Class R5 | THRRX         | C000113848 |
| Thornburg Limited Term Income Fund - Class R4 | THRIX         | C000136849 |
| Thornburg Limited Term Income Fund - Class R6 | THRLX         | C000177478 |
| Thornburg Limited Term Income Fund - Class C2 | THIQX         | C000222325 |

---

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

---

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

---

### Thornburg New York Intermediate Municipal Fund (Series ID: S000011848)

---

|  |  |  |
|:---|:---|:---|
| Class Name                                               | Ticker Symbol | Class ID   |
| Thornburg New York Intermediate Municipal Fund - Class A | THNYX         | C000032368 |
| Thornburg New York Intermediate Municipal Fund - Class I | TNYIX         | C000083544 |

---

### Thornburg International Equity Fund (Series ID: S000011849)

---

|  |  |  |
|:---|:---|:---|
| Class Name                                     | Ticker Symbol | Class ID   |
| Thornburg International Equity Fund - Class A  | TGVAX         | C000032369 |
| Thornburg International Equity Fund - Class C  | THGCX         | C000032371 |
| Thornburg International Equity Fund - Class I  | TGVIX         | C000032372 |
| Thornburg International Equity Fund - Class R5 | TIVRX         | C000032374 |
| Thornburg International Equity Fund - Class R4 | THVRX         | C000042671 |
| Thornburg International Equity Fund - Class R3 | TGVRX         | C000042672 |
| Thornburg International Equity Fund - Class R6 | TGIRX         | C000113849 |

---

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

---

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

---

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

---

|  |  |  |
|:---|:---|:---|
| Class Name                                          | Ticker Symbol | Class ID   |
| Thornburg Investment Income Builder Fund - Class A  | TIBAX         | C000032380 |
| Thornburg Investment Income Builder Fund - Class C  | TIBCX         | C000032381 |
| Thornburg Investment Income Builder Fund - Class I  | TIBIX         | C000032382 |
| Thornburg Investment Income Builder Fund - Class R3 | TIBRX         | C000042675 |
| Thornburg Investment Income Builder Fund - Class R5 | TIBMX         | C000047041 |
| Thornburg Investment Income Builder Fund - Class R4 | TIBGX         | C000058461 |
| Thornburg Investment Income Builder Fund - Class R6 | TIBOX         | C000177479 |

---

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

---

|  |  |  |
|:---|:---|:---|
| Class Name                                     | Ticker Symbol | Class ID   |
| Thornburg Global Opportunities Fund - Class A  | THOAX         | C000034775 |
| Thornburg Global Opportunities Fund - Class C  | THOCX         | C000034776 |
| Thornburg Global Opportunities Fund - Class I  | THOIX         | C000034777 |
| Thornburg Global Opportunities Fund - Class R3 | THORX         | C000058462 |
| Thornburg Global Opportunities Fund - Class R4 | THOVX         | C000058463 |
| Thornburg Global Opportunities Fund - Class R5 | THOFX         | C000058464 |
| Thornburg Global Opportunities Fund - Class R6 | THOGX         | C000177480 |

---

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

---

|  |  |  |
|:---|:---|:---|
| Class Name                                     | Ticker Symbol | Class ID   |
| Thornburg International Growth Fund - Class I  | TINGX         | C000042663 |
| Thornburg International Growth Fund - Class A  | TIGAX         | C000042664 |
| Thornburg International Growth Fund - Class C  | TIGCX         | C000042665 |
| Thornburg International Growth Fund - Class R3 | TIGVX         | C000058465 |
| Thornburg International Growth Fund - Class R4 | TINVX         | C000058466 |
| Thornburg International Growth Fund - Class R5 | TINFX         | C000058467 |
| Thornburg International Growth Fund - Class R6 | THGIX         | C000123223 |

---

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

---

|  |  |  |
|:---|:---|:---|
| Class Name                                 | Ticker Symbol | Class ID   |
| Thornburg Strategic Income Fund - Class A  | TSIAX         | C000056389 |
| Thornburg Strategic Income Fund - Class C  | TSICX         | C000056390 |
| Thornburg Strategic Income Fund - Class I  | TSIIX         | C000056391 |
| Thornburg Strategic Income Fund - Class R3 | TSIRX         | C000113850 |
| Thornburg Strategic Income Fund - Class R5 | TSRRX         | C000113851 |
| Thornburg Strategic Income Fund - Class R4 | TSRIX         | C000136850 |
| Thornburg Strategic Income Fund - Class R6 | TSRSX         | C000177481 |

---

### Thornburg Strategic Municipal Income Fund (Series ID: S000025152)

---

|  |  |  |
|:---|:---|:---|
| Class Name                                        | Ticker Symbol | Class ID   |
| Thornburg Strategic Municipal Income Fund Class A | TSSAX         | C000075018 |
| Thornburg Strategic Municipal Income Fund Class C | TSSCX         | C000075019 |
| Thornburg Strategic Municipal Income Fund Class I | TSSIX         | C000075020 |

---

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

---

|  |  |  |
|:---|:---|:---|
| Class Name                               | Ticker Symbol | Class ID   |
| Thornburg Developing World Fund Class A  | THDAX         | C000081859 |
| Thornburg Developing World Fund Class C  | THDCX         | C000081860 |
| Thornburg Developing World Fund Class I  | THDIX         | C000081861 |
| Thornburg Developing World Fund Class R5 | THDRX         | C000123224 |
| Thornburg Developing World Fund Class R6 | TDWRX         | C000123225 |

---

### Thornburg Short Duration Municipal Fund (Series ID: S000043669)

---

|  |  |  |
|:---|:---|:---|
| Class Name                                      | Ticker Symbol | Class ID   |
| Thornburg Short Duration Municipal Fund Class A | TLMAX         | C000135383 |
| Thornburg Short Duration Municipal Fund Class I | TLMIX         | C000135384 |

---

### Thornburg Ultra Short Income Fund (Series ID: S000043670)

---

|  |  |  |
|:---|:---|:---|
| Class Name                                | Ticker Symbol | Class ID   |
| Thornburg Ultra Short Income Fund Class A | TLDAX         | C000135385 |
| Thornburg Ultra Short Income Fund Class I | TLDIX         | C000135386 |

---

### Thornburg Better World International Fund (Series ID: S000050704)

---

|  |  |  |
|:---|:---|:---|
| Class Name                                          | Ticker Symbol | Class ID   |
| Thornburg Better World International Fund - Class A | TBWAX         | C000160136 |
| Thornburg Better World International Fund - Class C | TBWCX         | C000160137 |
| Thornburg Better World International Fund - Class I | TBWIX         | C000160138 |

---

### Thornburg Summit Fund (Series ID: S000064930)

---

|  |  |  |
|:---|:---|:---|
| Class Name                      | Ticker Symbol | Class ID   |
| Thornburg Summit Fund - Class A | TSAMX         | C000210187 |
| Thornburg Summit Fund - Class I | TSUMX         | C000210188 |

---

### Thornburg Emerging Markets Managed Account Fund (Series ID: S000079975)

---

|  |  |  |
|:---|:---|:---|
| Class Name | Ticker Symbol | Class ID   |
| Class SMA  | THMGX         | C000241472 |

---

### Thornburg Municipal Managed Account Fund (Series ID: S000079976)

---

|  |  |  |
|:---|:---|:---|
| Class Name | Ticker Symbol | Class ID   |
| Class SMA  | THMMX         | C000241473 |

---

### Thornburg Core Plus Bond Fund (Series ID: S000082059)

---

|  |  |  |
|:---|:---|:---|
| Class Name | Ticker Symbol | Class ID   |
| Class R6   | THCSX         | C000245315 |
| Class R5   | THCFX         | C000245316 |
| Class R4   | THCEX         | C000245317 |
| Class A    | THCAX         | C000245318 |
| Class I    | THCIX         | C000245319 |
| Class C    | THCCX         | C000245320 |
| Class R3   | THCHX         | C000245321 |

---

### Thornburg High Income Bond Managed Account Fund (Series ID: S000091427)

---

|  |  |  |
|:---|:---|:---|
| Class Name | Ticker Symbol | Class ID   |
| Class SMA  | THIBX         | C000259092 |

---

### Thornburg Investment Grade Bond Managed Account Fund (Series ID: S000091428)

---

|  |  |  |
|:---|:---|:---|
| Class Name | Ticker Symbol | Class ID   |
| Class SMA  | TIGMX         | C000259093 |

---

## Series and Classes Contracts Data

### Thornburg Limited Term Municipal Fund (Series ID: S000000540)

| Class ID   | Class Name                                       | Ticker Symbol   |
|:---|:---|:---|
| C000001427 | Thornburg Limited Term Municipal Fund - Class A  | LTMFX           |
| C000001438 | Thornburg Limited Term Municipal Fund - Class C  | LTMCX           |
| C000001449 | Thornburg Limited Term Municipal Fund - Class I  | LTMIX           |
| C000222321 | Thornburg Limited Term Municipal Fund - Class C2 | LTMQX           |

### Thornburg California Limited Term Municipal Fund (Series ID: S000011841)

| Class ID   | Class Name                                                  | Ticker Symbol   |
|:---|:---|:---|
| C000032344 | Thornburg California Limited Term Municipal Fund - Class A  | LTCAX           |
| C000032345 | Thornburg California Limited Term Municipal Fund - Class C  | LTCCX           |
| C000032346 | Thornburg California Limited Term Municipal Fund - Class I  | LTCIX           |
| C000222322 | Thornburg California Limited Term Municipal Fund - Class C2 | LTCQX           |

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

| Class ID   | Class Name                                             | Ticker Symbol   |
|:---|:---|:---|
| C000032347 | Thornburg Limited Term U.S. Government Fund - Class A  | LTUSX           |
| C000032349 | Thornburg Limited Term U.S. Government Fund - Class C  | LTUCX           |
| C000032350 | Thornburg Limited Term U.S. Government Fund - Class I  | LTUIX           |
| 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           |
| C000222323 | Thornburg Limited Term U.S. Government Fund - Class C2 | LTUQX           |

### Thornburg New Mexico Intermediate Municipal Fund (Series ID: S000011843)

| Class ID   | Class Name                                                 | Ticker Symbol   |
|:---|:---|:---|
| C000032352 | Thornburg New Mexico Intermediate Municipal Fund - Class A | THNMX           |
| C000032353 | Thornburg New Mexico Intermediate Municipal Fund - Class D | THNDX           |
| C000042667 | Thornburg New Mexico Intermediate Municipal Fund - Class I | THNIX           |

### Thornburg Intermediate Municipal Fund (Series ID: S000011844)

| Class ID   | Class Name                                       | Ticker Symbol   |
|:---|:---|:---|
| C000032354 | Thornburg Intermediate Municipal Fund - Class A  | THIMX           |
| C000032355 | Thornburg Intermediate Municipal Fund - Class C  | THMCX           |
| C000032356 | Thornburg Intermediate Municipal Fund - Class I  | THMIX           |
| C000222324 | Thornburg Intermediate Municipal Fund - Class C2 | THMQX           |

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

| Class ID   | Class Name                                    | Ticker Symbol   |
|:---|:---|:---|
| C000032357 | Thornburg Limited Term Income Fund - Class A  | THIFX           |
| C000032358 | Thornburg Limited Term Income Fund - Class C  | THICX           |
| C000032359 | Thornburg Limited Term Income Fund - Class I  | THIIX           |
| 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           |
| C000222325 | Thornburg Limited Term Income Fund - Class C2 | THIQX           |

### 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 New York Intermediate Municipal Fund (Series ID: S000011848)

| Class ID   | Class Name                                               | Ticker Symbol   |
|:---|:---|:---|
| C000032368 | Thornburg New York Intermediate Municipal Fund - Class A | THNYX           |
| C000083544 | Thornburg New York Intermediate Municipal Fund - Class I | TNYIX           |

### Thornburg International Equity Fund (Series ID: S000011849)

| Class ID   | Class Name                                     | Ticker Symbol   |
|:---|:---|:---|
| C000032369 | Thornburg International Equity Fund - Class A  | TGVAX           |
| C000032371 | Thornburg International Equity Fund - Class C  | THGCX           |
| C000032372 | Thornburg International Equity Fund - Class I  | TGVIX           |
| 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   |
|:---|:---|:---|
| 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           |

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

| Class ID   | Class Name                                          | Ticker Symbol   |
|:---|:---|:---|
| C000032380 | Thornburg Investment Income Builder Fund - Class A  | TIBAX           |
| C000032381 | Thornburg Investment Income Builder Fund - Class C  | TIBCX           |
| C000032382 | Thornburg Investment Income Builder Fund - Class I  | TIBIX           |
| 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   |
|:---|:---|:---|
| C000034775 | Thornburg Global Opportunities Fund - Class A  | THOAX           |
| C000034776 | Thornburg Global Opportunities Fund - Class C  | THOCX           |
| C000034777 | Thornburg Global Opportunities Fund - Class I  | THOIX           |
| 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   |
|:---|:---|:---|
| C000042663 | Thornburg International Growth Fund - Class I  | TINGX           |
| C000042664 | Thornburg International Growth Fund - Class A  | TIGAX           |
| C000042665 | Thornburg International Growth Fund - Class C  | TIGCX           |
| 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   |
|:---|:---|:---|
| C000056389 | Thornburg Strategic Income Fund - Class A  | TSIAX           |
| C000056390 | Thornburg Strategic Income Fund - Class C  | TSICX           |
| C000056391 | Thornburg Strategic Income Fund - Class I  | TSIIX           |
| 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 Strategic Municipal Income Fund (Series ID: S000025152)

| Class ID   | Class Name                                        | Ticker Symbol   |
|:---|:---|:---|
| C000075018 | Thornburg Strategic Municipal Income Fund Class A | TSSAX           |
| C000075019 | Thornburg Strategic Municipal Income Fund Class C | TSSCX           |
| C000075020 | Thornburg Strategic Municipal Income Fund Class I | TSSIX           |

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

| Class ID   | Class Name                               | Ticker Symbol   |
|:---|:---|:---|
| C000081859 | Thornburg Developing World Fund Class A  | THDAX           |
| C000081860 | Thornburg Developing World Fund Class C  | THDCX           |
| C000081861 | Thornburg Developing World Fund Class I  | THDIX           |
| C000123224 | Thornburg Developing World Fund Class R5 | THDRX           |
| C000123225 | Thornburg Developing World Fund Class R6 | TDWRX           |

### Thornburg Short Duration Municipal Fund (Series ID: S000043669)

| Class ID   | Class Name                                      | Ticker Symbol   |
|:---|:---|:---|
| C000135383 | Thornburg Short Duration Municipal Fund Class A | TLMAX           |
| C000135384 | Thornburg Short Duration Municipal Fund Class I | TLMIX           |

### Thornburg Ultra Short Income Fund (Series ID: S000043670)

| Class ID   | Class Name                                | Ticker Symbol   |
|:---|:---|:---|
| C000135385 | Thornburg Ultra Short Income Fund Class A | TLDAX           |
| C000135386 | Thornburg Ultra Short Income Fund Class I | TLDIX           |

### Thornburg Better World International Fund (Series ID: S000050704)

| Class ID   | Class Name                                          | Ticker Symbol   |
|:---|:---|:---|
| C000160136 | Thornburg Better World International Fund - Class A | TBWAX           |
| C000160137 | Thornburg Better World International Fund - Class C | TBWCX           |
| C000160138 | Thornburg Better World International Fund - Class I | TBWIX           |

### Thornburg Summit Fund (Series ID: S000064930)

| Class ID   | Class Name                      | Ticker Symbol   |
|:---|:---|:---|
| C000210187 | Thornburg Summit Fund - Class A | TSAMX           |
| C000210188 | Thornburg Summit Fund - Class I | TSUMX           |

### Thornburg Emerging Markets Managed Account Fund (Series ID: S000079975)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000241472 | Class SMA    | THMGX           |

### Thornburg Municipal Managed Account Fund (Series ID: S000079976)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000241473 | Class SMA    | THMMX           |

### Thornburg Core Plus Bond Fund (Series ID: S000082059)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000245315 | Class R6     | THCSX           |
| C000245316 | Class R5     | THCFX           |
| C000245317 | Class R4     | THCEX           |
| C000245318 | Class A      | THCAX           |
| C000245319 | Class I      | THCIX           |
| C000245320 | Class C      | THCCX           |
| C000245321 | Class R3     | THCHX           |

### Thornburg High Income Bond Managed Account Fund (Series ID: S000091427)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000259092 | Class SMA    | THIBX           |

### Thornburg Investment Grade Bond Managed Account Fund (Series ID: S000091428)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000259093 | Class SMA    | TIGMX           |

## FORM 24F-2NT: Annual Notice of Securities Sold Pursuant to Rule 24f-2

### 24F-2NT: Filer Information

**Filer CIK:** 0000816153

**Is this a LIVE or TEST Filing?:** LIVE

**Filer Investment Company Type:** N-1A

### 24F-2NT: Annual Filing Information

**1. Name and address of issuer:**

- **Name of Issuer:** Thornburg Investment Trust

- **Address:** 2300 North Ridgetop Road, Santa Fe, NM 87506

**2. The Name and EDGAR Identifier of each series or class of securities for which this Form is filed:**

- [ ] Check box if the Form is being filed for all series and classes of the issuer.

**3. Investment Company Act File Number:** 811-05201

   **Securities Act File Number:** 033-14905

**4(a). Last day of fiscal year for which this Form is filed:** 09/30/2025

**4(b). Check box if this Form is being filed late:** [ ]

**4(c). Check box if this is the last time the issuer will be filing this Form:** [ ]

**5. Calculation of registration fee:**

- **(i) Aggregate sale price of securities sold during the fiscal year:** $12662819630.70

- **(ii) Aggregate price of securities redeemed or repurchased during the fiscal year:** $11071723236.00

- **(iii) Aggregate price of securities redeemed or repurchased during any prior fiscal year:** $21055357085.32

- **(iv) Total available redemption credits [add Items 5(ii) and 5(iii)]:** $32127080321.32

- **(v) Net sales:** $0.00

- **(vi) Redemption credits available for use in future years:** $-19464260690.62

- **(vii) Multiplier for determining registration fee:** 0.0001381

- **(viii) Registration fee due:** $0.00

**Signatures**

**Name and Title:** Senior Manager, Fund Administration

**Date:** 12/17/2025

**Signature:** Christopher Luckham