# EDGAR Filing Document

**Accession Number:** 0002038383
**File Stem:** 0001999371-26-008728
**Filing Date:** 2026-4
**Character Count:** 2250
**Document Hash:** e5c35fe883b126a80502ddf2891f645e
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001999371-26-008728.hdr.sgml**: 20260422

**ACCESSION NUMBER**: 0001999371-26-008728

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20260422

**DATE AS OF CHANGE**: 20260422

**EFFECTIVENESS DATE**: 20260422

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Thornburg ETF Trust
- **CENTRAL INDEX KEY:** 0002038383

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** MA

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-282372
- **FILM NUMBER:** 26883283

**BUSINESS ADDRESS:**
- **STREET 1:** 2300 NORTH RIDGETOP ROAD
- **CITY:** SANTA FE
- **STATE:** NM
- **ZIP:** 87506
- **BUSINESS PHONE:** 617-235-4739

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

## Series and Classes Contracts Data

### Thornburg Multi Sector Bond ETF (Series ID: S000089220)

---

|  |  |  |
|:---|:---|:---|
| Class Name                      | Ticker Symbol | Class ID   |
| Thornburg Multi Sector Bond ETF | TMB           | C000255735 |

---

## Series and Classes Contracts Data

### Thornburg Multi Sector Bond ETF (Series ID: S000089220)

| Class ID   | Class Name                      | Ticker Symbol   |
|:---|:---|:---|
| C000255735 | Thornburg Multi Sector Bond ETF | TMB             |

![](tmb_001.jpg)

**THORNBURG ETF TRUST**

**Supplement, dated April 22, 2026**

**to the Prospectus and Statement of Additional Information (the "SAI"), each dated December 30, 2025, as supplemented, of Thornburg Multi Sector Bond ETF (the "Fund") (ticker: TMB), a series of Thornburg ETF Trust**

Effective April 24, 2026, the number of shares of the Fund constituting a creation unit for the Fund shall decrease from 50,000 shares to 20,000 shares. Therefore, all references in the Prospectus and SAI to 50,000 as the number of shares of the Fund constituting a creation unit for the Fund shall be deleted and replaced with references to 20,000.

Shareholders should retain this supplement for future reference. This supplement provides new information beyond that contained in the Fund's Prospectus and SAI and should be read in conjunction therewith.

TH6781