# EDGAR Filing Document

**Accession Number:** 0001579881
**File Stem:** 0001104659-26-008715
**Filing Date:** 2026-1
**Character Count:** 6439
**Document Hash:** 11b446bcc71ee074cc0120e8f761a17a
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-26-008715.hdr.sgml**: 20260130

**ACCESSION NUMBER**: 0001104659-26-008715

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 17

**FILED AS OF DATE**: 20260130

**DATE AS OF CHANGE**: 20260130

**EFFECTIVENESS DATE**: 20260130

**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:** 26584384

**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 Bitcoin Structured Alt Protection ETF - January (Series ID: S000090114)

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|  |  |
|:---|:---|
| Class Name                                              | Class ID   |
| Calamos Bitcoin Structured Alt Protection ETF - January | C000256995 |

---

## Series and Classes Contracts Data

### Calamos Bitcoin Structured Alt Protection ETF - January (Series ID: S000090114)

| Class ID   | Class Name                                              | Ticker Symbol   |
|:---|:---|:---|
| C000256995 | Calamos Bitcoin Structured Alt Protection ETF - January |  |

?xml version='1.0' encoding='ASCII'?

Rule 497(e)

File No. 333-191151

**CALAMOS ETF TRUST**

(the "Trust")

**Calamos Bitcoin Structured Alt Protection ETF<sup>®</sup> – January**

(the "Fund")

Supplement dated January 30, 2026

to the Fund's Prospectus dated November 28, 2025

*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.*

As described in the Fund's prospectus, an investment in shares of the Fund is subject to an upside return cap (the "Cap") that represents the maximum percentage return an investor can achieve from an investment in the Fund for the Outcome Period of approximately one year. The Fund's current Outcome Period will end on January 31, 2026. The next Outcome Period will begin on February 1, 2026 and end on January 31, 2027 (the "Upcoming Outcome Period"). The Fund's Cap for the Outcome Period beginning on February 1, 2026 is set forth below.

8.36%

(7.67% after taking into account the Fund's management fees)

The Fund's return will be further reduced by brokerage commissions, trading fees, taxes and non-routine or extraordinary expenses not included in the Fund's management fee, as described in the prospectus.

Effective February 1, 2026, the Fund's Prospectus is amended to revise all references to the Outcome Period and Cap to reflect the information above.

On February 1, 2026, the Fund's summary prospectus will be amended to update all references to the Cap and Outcome Period to reflect the Cap and new Outcome Period, as described above.

Further, effective February 1, 2026, on pages 6 and 49 of the Prospectus, the table reflecting Portfolio Investment, Investment Terms, Portfolio Investment Percentage, and Target Portfolio Maturity is deleted in its entirety and replaced with the following:

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| | | | |
|:---|:---|:---|:---|
| **PORTFOLIO INVESTMENT** | **INVESTMENT TERMS** | **PORTFOLIO<br> INVESTMENT <br> PERCENTAGE** | **TARGET<br> PORTFOLIO <br> MATURITY** |
| **Some combination of cash, cash equivalents, box spreads, and/or U.S. Treasury securities** | Multiple series of U.S. Treasury Bills supported by full faith and credit of U.S. government, cash, cash equivalents, and/or box spreads | Approximately 96% at the time of investment | 12 months |
| **Purchased call option contracts on Underlying ETPs and/or Bitcoin Index** | "At-the-money" (i.e., strike price equal to the current bitcoin reference asset market price) call options at approximately 100% of the respective Underlying ETPs and/or Bitcoin Index price at the time of investment | Approximately 22% at the time of investment | 12 months |
| **Sold call option contracts on Underlying ETPs and/or Bitcoin Index** | "Out-of-the-money" (i.e., strike price is more than the current bitcoin reference asset market price) options used to help fund purchased call option contracts | Approximately -18% at the time of investment | 12 months |

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Effective February 1, 2026, on pages 9 and 52 of the Prospectus, the table reflecting Portfolio Investment, Investment Terms, Portfolio Investment Percentage, and Target Portfolio Maturity is deleted in its entirety and replaced with the following:

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| | | | |
|:---|:---|:---|:---|
| **PORTFOLIO INVESTMENT** | **INVESTMENT TERMS** | **PORTFOLIO<br> INVESTMENT <br> PERCENTAGE** | **TARGET<br> PORTFOLIO <br> MATURITY** |
| **Purchased deep in-the-money call option contracts on Underlying ETPs and/or Bitcoin Index** | Involves purchasing a near zero-strike (i.e., deep in-the-money) call on the reference asset, at a pre-determined strike to provide approximately full participation to the price return of the underlying reference asset. In other words, the approximately full participation provided by this layer provides potential gains and losses that are tantamount to that of owning the Underlying ETPs and/or Bitcoin Index outright. | Approximately 100% at the time of investment | 12 months |
| **Purchased at-the-money put option contracts on Underlying ETPs and/or Bitcoin Index** | Involves purchasing an at-the-money put option, which produces protection equal to 100% of losses (before total fund operating fees and expenses) of the price return of the reference asset, over the Outcome Period. | Approximately 18% at the time of investment | 12 months |
| **Sold out-of-the-money call option contracts on Underlying ETPs and/or Bitcoin Index** | Involves selling an out-of-the-money call, thereby creating the upside cap. The strike price at which the call is sold is determined so that the combined net options purchase price is approximately equal to the underlying asset's current value. The cost of this layer is a credit equal to the price that would make the total package "no-cost" or fully financed. | Approximately -18% at the time of investment | 12 months |

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