# EDGAR Filing Document

**Accession Number:** 0000826732
**File Stem:** 0001104659-26-076486
**Filing Date:** 2026-6
**Character Count:** 3140
**Document Hash:** 76981a57bb9612cf9652b51f18448dfd
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-26-076486.hdr.sgml**: 20260622

**ACCESSION NUMBER**: 0001104659-26-076486

**CONFORMED SUBMISSION TYPE**: 497K

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260622

**DATE AS OF CHANGE**: 20260622

**EFFECTIVENESS DATE**: 20260622

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** CALAMOS INVESTMENT TRUST/IL
- **CENTRAL INDEX KEY:** 0000826732

**ORGANIZATION NAME:**
- **EIN:** 363316238
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1031

**FILING VALUES:**
- **FORM TYPE:** 497K
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-19228
- **FILM NUMBER:** 261108135

**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

## Series and Classes Contracts Data

### Calamos Timpani SMID Growth Fund (Series ID: S000065991)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000213160 | Class R6     | CTOGX           |
| C000213161 | Class A      | CTAGX           |
| C000213162 | Class I      | CTIGX           |

**CALAMOS INVESTMENT TRUST**

Calamos Timpani SMID Growth Fund (the "Fund")

Supplement dated June 22, 2026 to the Fund's

Prospectus, Summary Prospectus and

Statement of Additional Information, each dated February 27, 2026

**This supplement further supplements and provides updated information on one of the key dates to that contained in supplement dated June 1, 2026 to the amended and restated supplement dated April 28, 2026 to the Fund's Prospectus, Summary Prospectus and Statement of Additional Information.**

**Conversion of the Fund to an ETF – Key Date Updates**

The purpose of this supplement is to advise of the change of one key date of which Shareholders need to be aware (in **bold** type below); namely, the anticipated closing date of the conversion.

In connection with the proposed conversion of the Fund into an ETF, Class A and Class R6 shares of the Fund will be consolidated into Class I shares of the Fund on or about September 4, 2026, prior to the conversion which is expected to occur on or about **September 18, 2026**. Existing holders of Class R6 shares should be aware that Class I shares are subject to additional costs not typically associated with Class R6 shares and as a result may not be eligible for holding by certain retirement accounts. In coordination with the financial intermediaries holding Class R6 Shares of the Fund for shareholders, the Advisor will assist those Class R6 shareholders seeking to either exchange or redeem their Class R6 shares prior to the contemplated conversion date.

*This supplement updates certain information contained in the supplement dated June 1, 2026 to the amended and restated supplement dated April 28, 2026 to the Prospectus, Summary Prospectus and SAI noted above and should be attached to the Prospectus, Summary Prospectus and SAI and retained for future reference.*