# EDGAR Filing Document

**Accession Number:** 0001579881
**File Stem:** 0001104659-26-075943
**Filing Date:** 2026-6
**Character Count:** 2755
**Document Hash:** 4a93dca0022626c46c70e9994293c894
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-26-075943.hdr.sgml**: 20260622

**ACCESSION NUMBER**: 0001104659-26-075943

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260622

**DATE AS OF CHANGE**: 20260622

**EFFECTIVENESS DATE**: 20260622

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Calamos ETF Trust
- **CENTRAL INDEX KEY:** 0001579881

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

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-191151
- **FILM NUMBER:** 261104732

**BUSINESS ADDRESS:**
- **STREET 1:** 2020 CALAMOS COURT
- **CITY:** NAPERVILLE
- **STATE:** IL
- **ZIP:** 60563
- **BUSINESS PHONE:** 630-245-8394

**MAIL ADDRESS:**
- **STREET 1:** 2020 CALAMOS COURT
- **CITY:** NAPERVILLE
- **STATE:** IL
- **ZIP:** 60563

## Series and Classes Contracts Data

### Calamos Active Hedged Equity ETF (Series ID: S000105820)

---

|  |  |
|:---|:---|
| Class Name                       | Class ID   |
| Calamos Active Hedged Equity ETF | C000276611 |

---

## Series and Classes Contracts Data

### Calamos Active Hedged Equity ETF (Series ID: S000105820)

| Class ID   | Class Name                       | Ticker Symbol   |
|:---|:---|:---|
| C000276611 | Calamos Active Hedged Equity ETF |  |

**Rule 497(e)**

**File No. 333-191151**

**CALAMOS ETF TRUST**

(the "Trust")

**Calamos Active Hedged Equity ETF**

(the "Fund")

Supplement dated June 22, 2026

to the Fund's Prospectus dated June 22, 2026

*This supplement updates certain information contained in the Fund's prospectus and should be attached to the prospectus and retained for future reference.*

*Capitalized terms not defined herein have the same meaning as in the Fund's prospectus.*

Although the Fund's registration statement has become effective under the Securities Act of 1933, as amended, **shares of the Fund are not yet available for purchase**. Shares of the Fund are not currently listed on any national securities exchange and are not available for purchase or sale at this time. The Fund expects to commence operations and list its shares on the CBOE BZX Exchange, Inc. ("BZX") at a future date to be announced.

Investors will be notified of the date the Fund is scheduled to list and begin trading on BZX through a subsequent supplement to the Fund's Prospectus or through other means of notice as required by applicable law. Until such notice is provided, the Fund is not open for investment and no offers, purchases, trading or redemptions of shares of the Fund will be accepted.

*This Supplement is not an offer to sell or a solicitation of an offer to buy shares of the Fund.*

**Please retain this supplement for future reference.**