# EDGAR Filing Document

**Accession Number:** 0001579881
**File Stem:** 0001104659-26-044175
**Filing Date:** 2026-4
**Character Count:** 2463
**Document Hash:** 4e76ee234622e172ce7b160df414e744
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-26-044175.hdr.sgml**: 20260416

**ACCESSION NUMBER**: 0001104659-26-044175

**CONFORMED SUBMISSION TYPE**: 497J

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260416

**DATE AS OF CHANGE**: 20260416

**EFFECTIVENESS DATE**: 20260416

**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:** 497J
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-191151
- **FILM NUMBER:** 26866106

**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 Tax-Aware Collateral ETF (Series ID: S000102580)

| Class ID   | Class Name                       | Ticker Symbol   |
|:---|:---|:---|
| C000273082 | Calamos Tax-Aware Collateral ETF |  |

April 16, 2026

<u>VIA EDGAR</u>

Filing Desk

Securities and Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549

Re: Calamos ETF Trust (the "Trust") (File Nos. 333-191151 and 811-22887)

Ladies and Gentlemen:

On behalf of the Trust, and pursuant to the Securities Act of 1933, as amended (the "Securities Act"), and Rule 497(j) thereunder, we hereby represent that the definitive forms of the Trust's Prospectus and Statement of Additional Information related to its series, Calamos Tax-Aware Collateral ETF dated April 13, 2026, that would have been filed pursuant to the requirements of Rule 497(c) under the Securities Act, would not have differed from the one contained in the Trust's Post-Effective Amendment No. 83 to its Registration Statement on Form N-1A, which was filed electronically with the Securities and Exchange Commission pursuant to Rule 485(b) under the Securities Act on April 10, 2026.

If you have any questions concerning this filing, please call me at 630-245-8394.

Sincerely,

/s/ J. Christopher Jackson

J. Christopher Jackson, Esq.

Assistant Secretary of the Trust

---

| | |
|:---|:---|
| cc: | John P. Calamos, Sr. |
|  | Erik D. Ojala, Esq. |
|  | J. Christopher Jackson, Esq. |
|  | Paulita Pike, Esq., Ropes & Gray LLP |
|  | Rita Rubin, Esq., Ropes & Gray LLP |
|  | Lawrence Zmerega, Esq., Ropes & Gray LLP |

---