# EDGAR Filing Document

**Accession Number:** 0001079575
**File Stem:** 0001104659-26-045814
**Filing Date:** 2026-4
**Character Count:** 2673
**Document Hash:** 602ba1350f5be069d3e5af89c04df346
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-26-045814.hdr.sgml**: 20260421

**ACCESSION NUMBER**: 0001104659-26-045814

**CONFORMED SUBMISSION TYPE**: 497J

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260421

**DATE AS OF CHANGE**: 20260421

**EFFECTIVENESS DATE**: 20260421

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** CALAMOS ADVISORS TRUST/IL
- **CENTRAL INDEX KEY:** 0001079575

**ORGANIZATION NAME:**
- **EIN:** 367271106
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 497J
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-72511
- **FILM NUMBER:** 26877272

**BUSINESS ADDRESS:**
- **STREET 1:** 2020 CALAMOS COURT
- **STREET 2:** C/O CALAMOS ADVISORS LLC
- **CITY:** NAPERVILLE
- **STATE:** IL
- **ZIP:** 60563
- **BUSINESS PHONE:** 6302451046

**MAIL ADDRESS:**
- **STREET 1:** 2020 CALAMOS COURT
- **STREET 2:** C/O CALAMOS ADVISORS LLC
- **CITY:** NAPERVILLE
- **STATE:** IL
- **ZIP:** 60563

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** CALAMOS INSURANCE TRUST
- **DATE OF NAME CHANGE:** 19990212

## Series and Classes Contracts Data

### Calamos Growth & Income Portfolio (Series ID: S000006427)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000017621 | Class I      |  |

April 21, 2026

<u>VIA EDGAR</u>

Filing Desk

Securities and Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549

Re: Calamos Advisors Trust (the "Trust") (File Nos. 333-72511 and 811-09237)

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, each dated April 30, 2026, that would have been filed pursuant to the requirements of Rule 497(c) under the Securities Act, would not have differed from those contained in the Trust's Post-Effective Amendment No. 40 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 630-245-1105.

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| |
|:---|
| Sincerely, |
| Calamos Advisors LLC |
| /s/ Susan L. Schoenberger |
| Susan L. Schoenberger, Esq. |
| Vice President, Associate Counsel |

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| | |
|:---|:---|
| cc: | John P. Calamos, Sr. |
|  | Erik D. Ojala, Esq. |
|  | Paulita Pike, Esq., Ropes & Gray LLP |
|  | Rita Rubin, Esq., Ropes & Gray LLP |
|  | Kathleen Nichols, Esq., Ropes & Gray LLP |
|  | Stephanie Flynn, Esq. Ropes & Gray LLP |

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