# EDGAR Filing Document

**Accession Number:** 0001579881
**File Stem:** 0001104659-25-062107
**Filing Date:** 2025-6
**Character Count:** 50327
**Document Hash:** a12129b93fb307248560613ba679403c
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-25-062107.hdr.sgml**: 20250624

**ACCESSION NUMBER**: 0001104659-25-062107

**CONFORMED SUBMISSION TYPE**: 497K

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20250624

**DATE AS OF CHANGE**: 20250624

**EFFECTIVENESS DATE**: 20250624

**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:** 497K
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-191151
- **FILM NUMBER:** 251069486

**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 Autocallable Income ETF (Series ID: S000093393)

| Class ID   | Class Name                      | Ticker Symbol   |
|:---|:---|:---|
| C000261610 | Calamos Autocallable Income ETF | CAIE            |

**June 25, 2025**

Summary Prospectus

Calamos Autocallable Income ETF

(NYSE Arca – CAIE)

![](j25119906_ba001.jpg)

*Before you invest, you may want to review the Fund's prospectus and statement of additional information, which contain more information about the Fund and its risks. You can find the Fund's prospectus, statement of additional information, reports to shareholders and other information about the Fund online at www.calamos.com/resources. You can also get this information at no cost by calling 866.363.9219 or by sending an e-mail request to prospectus@calamos.com. The current prospectus and statement of additional information dated June 25, 2025 (and as each may be amended or supplemented), are incorporated by reference into this summary prospectus.*

Investment Objective

**Calamos Autocallable Income ETF** (the "Fund") seeks to generate high monthly income while providing reduced downside risk through exposure to the MerQube US Large Cap Vol Advantage Autocallable Index (the "Autocallable Index"). The Autocallable Index is designed to reflect the performance of a theoretical diversified portfolio of synthetic autocallable notes (each an "Autocallable" and the theoretical portfolio of Autocallables, the "Index Portfolio"). The reduced downside risk that the Fund seeks to deliver is relative to owning a single underlying autocallable note (and not relative to risk associated with investing in the S&P 500), because exposure to the Autocallable Index is expected to provide benefits such as reduced timing risk, diversification across multiple notes (i.e., not subject to a single maturity barrier), and contingent maturity barriers that may help preserve capital over time.

Fees and Expenses of the Fund

The following table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund ("Fund Shares"). **Investors may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.**

**Annual Fund Operating Expenses** (ongoing expenses that you pay each year as a percentage of the value of your investments):

---

| | |
|:---|:---|
| Management Fees | 0.74% |
| Distribution and/or Service Fees (12b-1) | 0.00% |
| Other Expenses<sup>1</sup> | 0.00% |
| Total Annual Fund Operating Expenses | 0.74% |

---

1 "Other Expenses" is an estimate based on the expenses the Fund expects to incur for the current fiscal year.

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated, and then sell all of your Fund Shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs, whether you sell or hold your Fund Shares, would be:

---

| | |
|:---|:---|
| Year 1 | Year 3 |
| $76 | $237 |

---

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund Shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the example, affect the Fund's performance. Because the Fund has not yet commenced operations, portfolio turnover information is unavailable at this time.

Principal Investment Strategies

The Fund is a non-diversified, actively managed exchange-traded fund ("ETF") that, under normal market conditions, seeks to invest at least 80% of its total assets in U.S. Treasuries, cash and cash equivalents and unfunded total return swaps that provide exposure to the Autocallable Index. The Fund will not attempt to replicate or track the Autocallable Index, but will instead use financial instruments such as total return swaps to gain exposure to the level of the Autocallable Index. The Fund intends to make periodic distributions to Investors in amounts that are determined in part by reference to the Autocallable Index. The Autocallable Index is designed to reflect the collective performance of a theoretical portfolio of 52 to 260 synthetic Autocallables arranged in a laddered structure with staggered entry points with similar fixed parameters (the "Parameters") as described below within the section entitled "Autocallable Index Portfolio Characteristics". The Autocallables' coupon payments, principal repayment timing and principal value at maturity, and ultimately the Fund's total return, is contingent and with respect to principal value at maturity, based on the performance of the MerQube US Large Cap Vol Advantage Index (the 'Underlying Reference Index'), which provides volatility adjusted exposure to E-Mini S&P 500 futures contracts.

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Calamos Autocallable Income ETF

The Fund's portfolio will be comprised of unfunded total return swaps, U.S. Treasuries, cash and cash equivalents. The Fund expects to invest substantially all of its assets in U.S. Treasury securities with remaining maturities of one (1) year or less, cash and cash equivalents and unfunded total return swaps providing exposure to an Autocallable Index (the "Swap Agreements"). However, in order to meet its margin requirements on the Swap Agreements, the Fund may allocate all or a significant portion of its cash to investments in eligible collateral instruments such as: investment-grade fixed income and floating rate bonds; notes with variable interest rates tied to benchmarks issued by governments and European or U.S. investment-grade corporate issuers; commercial paper and money market funds.

Each synthetic Autocallable is designed to pay a percentage of the notional amount allocated to that Autocallable at certain set observation dates (e.g., monthly, noting the monthly observation dates are specific to each Autocallable) (a "Coupon"), provided that the Underlying Reference Index remains within certain predefined levels. If on specified monthly observation dates the Underlying Reference Index reaches or exceeds a certain level (the "Autocallable Barrier") then the synthetic Autocallable will automatically mature. The Coupon is intended to be paid even when the Underlying Reference Index experiences a certain amount of negative performance, but only down to a certain predetermined level (the "Coupon Barrier"). If the performance of the Underlying Reference Index is below the Coupon Barrier on any observation date no Coupon is paid for that then-ended observation period.

Each synthetic Autocallable is subject to a one year non-callable period from the date of issuance (the "Non-Callable Period"). Each synthetic Autocallable incorporates a principal protection feature so that, if the Underlying Reference Index has not reached or exceeded the Autocallable Barrier before the scheduled maturity date, any negative performance below the Autocallable Barrier as at the maturity date will not have any negative impact on the return of principal under the synthetic Autocall, provided the Underlying Reference Index is not below a certain predetermined level at maturity (the "Maturity Barrier"). Only if the Underlying Reference Index is below that Maturity Barrier at maturity will the Autocallable Index, and in turn investors, be exposed to the full downside performance of the Underlying Reference Index at maturity. Therefore, while synthetic Autocallables may preserve capital in certain negative market conditions (i.e., if the Underlying Reference Index remains above the Maturity Barrier), adverse market conditions in the equity market can lead to negative returns for the Fund.

The Fund's exposure to the Autocallables is obtained through one or more Swap Agreements with one or more qualified financial institutions ("Swap Counterparties"). These Swap Agreements reference the Autocallable Index, which is designed to reflect the aggregate performance of the entire Index Portfolio. Through this approach, the Fund obtains comprehensive exposure to the diversified portfolio of Autocallables via one or more derivative instruments.

In addition to the above, the Fund expects to invest in money market instruments, including U.S. Treasury Securities and repurchase agreements as well as cash and cash equivalents.

The Fund may invest up to 25% of its total assets in a wholly-owned subsidiary (a "Subsidiary"), organized under the laws of the Cayman Islands. If determined necessary or advisable by the Fund, investment in the Subsidiary is expected to provide the Fund with exposure to the Autocallable Index within the limitations of Subchapter M of the Internal Revenue Code of 1986, as amended (the "Code") and Internal Revenue Service guidance. The Subsidiary may invest primarily in derivative instruments, including Swap Agreements.

Investment Structure Overview

The Fund's investment approach centers on gaining exposure to a theoretical diversified portfolio of approximately 52 to 260 synthetic autocallables using one or more Swap Agreements that reference the Autocallable Index. Each of these Autocallables is linked to the performance of the MerQube US Large-Cap Vol Advantage Index (the "Underlying Reference Index"), which dynamically adjusts its exposure to E-Mini S&P 500 futures contracts based on market volatility conditions. To efficiently implement this strategy, the Fund enters into one or more Swap Agreements with Swap Counterparties. These Swap Agreements reference the Autocallable Index, which is designed to reflect the aggregate performance of the entire Index Portfolio, allowing the Fund to gain comprehensive exposure to a theoretical portfolio of synthetic Autocallables through a single instrument. The returns are based on certain pre-defined payout and return characteristics described in more detail in the section below entitled "Index Portfolio Characteristics". Each Autocallable's return profile will be linked to the Underlying Reference Index as a whole and does not look-through to the individual constituents of such index.

Index Portfolio Characteristics

The Fund provides investors with exposure to an index which is designed to reflect the aggregate total return of a theoretical portfolio of approximately 52 to 260 synthetic Autocallables. Each synthetic Autocallable in the Index Portfolio may achieve one or both of the following payout and return characteristics depending on the performance of the Underlying Reference Index:

(a) fixed periodic payments on specified observation dates and/or at maturity if the level of the Underlying Reference Index is at or above the Coupon Barrier (as set forth below), but below the Autocallable Barrier;

or

(b) as part of the Autocallables' return, the Autocallable Index, and in turn the Fund may be exposed to the negative performance of the Underlying Reference Index in case the level of such Underlying Reference Index is below the Maturity Barrier at maturity.

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Calamos Autocallable Income ETF

Each synthetic Autocallable in the Index Portfolio will have the following key characteristics/parameters (the "Parameters"):

**I. Individual Autocallables:** Each synthetic Autocallable in the Index Portfolio features (as more set forth in the table below):

• 5-year tenor (Maturity)

• 1-year initial Non-Callable Period from the date of issuance

• U.S. Dollar denomination

• 60% Maturity Barrier (observed at maturity)

• 60% Coupon Barrier (observed monthly)

• Contingent Coupon Payment — Predetermined date on which the level of the Underlying Reference Index is compared to the Coupon Barrier. Coupon levels determined by prevailing market conditions with reference to a US equity quantitative index at the time a given Autocallable is added to the Index Portfolio.

• Direct link to the performance of the Underlying Reference Index

**II. Key Components:** Each Autocallable in the Index Portfolio has three main components:

• Call Feature: Upon the expiration of each Autocallable's Non-Callable Period, the Autocallable will automatically be called prior to its scheduled maturity date if the Underlying Reference Index reaches or exceeds the Autocallable Barrier on a monthly Observation Date

• Contingent Coupon: A coupon is paid monthly on the Autocallable if, on the monthly Observation Date, the performance of the Underlying Reference Index is at or above the Coupon Barrier. If the Underlying Reference Index falls below the Coupon Barrier on an Observation Date, no coupon will be paid for that period.

• Contingent Principal Protection: If an Autocallable is not called prior to Maturity, the initial principal is fully protected if the Underlying Reference Index's level is above the Maturity Barrier (60%) at maturity. If the Underlying Reference Index closes below the Maturity Barrier, principal loss for that Autocallable will be equivalent to the negative performance of the Underlying Reference Index measured over the life of the Autocall.

The underlying Index Portfolio will be rebalanced weekly, employing a weekly roll mechanism whereby Autocallables that have auto called or matured are replaced with new Autocallables and any Coupons paid are reinvested in Autocallables.

**III. Implementation Mechanism:** To efficiently gain exposure to this theoretical diversified portfolio of synthetic Autocallables, the Fund utilizes:

• Swap Agreements with Swap Counterparties

• The Autocallable Index as a reference for these Swap Agreements, which is designed to reflect the aggregate performance of the entire Index Portfolio (See "The Underlying Reference Index")

---

| | | |
|:---|:---|:---|
| PARAMETER | DESCRIPTION | SPECIFIC DATA |
| Autocallable Barrier | The predetermined level of the Underlying Reference Index, which if reached or exceeded on specified Observation Dates will cause the Autocallable to automatically mature. | 100% of the value of the Underlying Reference Index as at the date the Autocallable was included in the Portfolio. |
| Coupon Barrier | The predetermined level of with respect to the Underlying Reference Index which if reached or exceeded on specified Observation Dates will cause a fixed amount to be paid (the "Coupon"). | 60% of the value of the Underlying Reference Index as at the date it is included in the Index Portfolio |
| Maturity Barrier | The predetermined level of the Underlying Reference Index above which on the Maturity Date of the Autocallable will result in the full repayment of principal. | 60% of the value of the Underlying Reference Index as at the date the Autocallable was included in the Index Portfolio. |
| Observation Date — Autocallables Call Feature | Predetermined dates on which the level of the Underlying Reference Index is compared to the Autocallable Barrier and the Coupon Barrier | Monthly |
| Observation Date — Contingent Principal Protection | A predetermined date on which the level of the Underlying Reference Index is compared to the Maturity Barrier | The maturity date |
| Observation Date — Contingent Coupon Payment | Predetermined dates on which the level of the Underlying Reference Index is compared to the Coupon Barrier | Monthly |

---

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Calamos Autocallable Income ETF

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| | | |
|:---|:---|:---|
| PARAMETER | DESCRIPTION | SPECIFIC DATA |
| Maturity | The final observation date, on which the Autocallable terminates and the final cash flows are determined | 5 years |
| Coupon Percentage | The percentage number that determines the size of the Coupon to be made on specified Observation Dates, if the relevant payout and return characteristics have been met (the "Coupon"). | The Coupon rate is established via prevailing current market environments and specific parameters with the Underlying Reference Index. |

---

Once an Autocallable has been included in the Index Portfolio, the payout and return characteristics for such Autocallable can no longer be changed. Therefore, there is no discretion involved in the payout process for each Autocallable as such payout depends on the performance of the Underlying Reference Index on the specific observation dates.

With regard to the Maturity Barrier, it should be noted that if on the Maturity Date, the level of the Underlying Reference Index is below the Maturity Barrier the amount of principal repaid will be reduced, as per the example below, which will negatively impact the overall value of the Autocallable Index and, in turn, the Fund.

For example, noting the Maturity Barrier for an Autocallable is 60% of the level of an Underlying Reference Index as of the date the synthetic Autocallable is issued:

• if such Underlying Reference Index of such Autocallable falls by only 10% (which is still above the Maturity Barrier) then the negative performance of the Underlying Reference Index will not reduce amount of principal to be repaid;

• on the other hand, if such Underlying Reference Index falls by 45% (i.e., to 55% of the level it was at when the Autocallable was issued and which is below the Maturity Barrier), then at maturity the amount of principal to be repaid will have fallen by 45%.

As the Fund is exposed to the Autocallables through the performance of the Index Portfolio under the Swap Agreement(s), any negative return of an Autocallable in the Index Portfolio will negatively impact the level of the Autocallable Index and, in turn, the Fund.

Portfolio Management and Rebalancing

The Autocallable Index is managed through a systematic process, and the Fund gains exposure to the Autocallable Index through the use of Swap Agreements. The underlying Index Portfolio will be rebalanced weekly, employing a weekly roll mechanism whereby Autocallables that have auto called or matured are replaced with new Autocallables and any Coupons paid are reinvested in Autocallables. This systematic approach seeks to benefit from (i) diversification of entry points across market cycles; (ii) minimization of timing risk associated with single-entry investments and (iii) maintaining a consistent exposure to a theoretical portfolio of approximately 52 to 260 synthetic Autocallables. Furthermore, by gaining exposure, via the Autocallable Index, to the total return of approximately 52 to 260 Autocallables with staggered entry points, the Fund creates a theoretical diversified portfolio that seeks to (i) smooth income generation over time; (ii) reduce concentration risk in any single market entry point; and (iii) potentially lower overall portfolio volatility.

While the Autocallable Index follows systematic rules for maintenance and replacement, the Adviser actively oversees the Swap Counterparty exposure and creditworthiness, collateral management and optimization, the Fund's overall portfolio risk characteristics as well as the execution quality and management of Swap Agreements.

The Underlying Reference Index

The MerQube US Large Cap Vol Advantage Index (the "Underlying Reference Index") is designed to provide volatility adjusted exposure to E-Mini S&P 500 futures contracts (the "Equity Component") by targeting an implied volatility of 35%, subject to a 6% decrement per annum. Unlike traditional equity indices that maintain fixed allocations, this index dynamically adjusts exposure based on market volatility conditions. During calm or typical market environments, the Underlying Reference Index increases exposure to equity futures while during volatile market periods, the Underlying Reference Index reduces exposure to equity futures. Unlike other volatility target indices that rebalance daily based on realized volatility, this Underlying Reference Index rebalances weekly (at the end of each week) based on one-week implied volatility derived from SPY weekly options prices. This approach seeks to maintain a more consistent risk profile across varying market conditions while potentially reducing drawdowns during market stress and improving risk-adjusted returns over time.

The Underlying Reference Index is a rules-based, systematic index designed to provide dynamic exposure to U.S. large-capitalization equities while employing a volatility management methodology that seeks to maintain a target volatility level. The Underlying Reference Index dynamically adjusts exposure between the Equity Component and a cash position based on prevailing market volatility conditions.

Autocallable Index Methodology

The Autocallable Index is designed to reflect the performance of a theoretical portfolio of synthetic Autocallables (the "Autocallables" which have the MerQube US Large Cap Vol Advantage Index as the reference underlying asset). The Autocallables in the theoretical portfolio follow predetermined terms including a 260-week maturity period from issue date, a 52-week non-call period from the issue date, and coupon

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Calamos Autocallable Income ETF

payments every four (4) weeks. Each autocallable features conditional cash flows on specific monthly observation dates, with payments depending on whether the underlying asset is above or below specified thresholds, including a 100% autocallable barrier and 60% principal and coupon barrier percentages. The Autocallable Index provider's pricing model determines the present value of these synthetic securities accounting for prevailing market conditions and contemplates the reinvestment of cash flows.

The Autocallable Index rebalances at preset intervals (weekly), adding one new autocallable security at each rebalance date. The initial portfolio comprises 20 autocallable securities issued on each Friday between January 14, 2005 and May 27, 2005. To maintain diversification, the Index applies concentration limits through an allocation cap that restricts the weight of any individual synthetic Autocallable security to 5%. Cash from maturing or redeemed securities is systematically reallocated across the portfolio according to predefined rules. The Index is calculated daily, rebalanced weekly and is denominated in U.S. Dollars with the Index Base Value set at 100.

The Index is composed of a theoretical portfolio of autocallable securities with the following characteristics:

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| | |
|:---|:---|
| SPECIFICATION | AUTOCALLABLE INDEX |
| Reference Asset | MerQube US Large Cap Vol Advantage Index |
| Face Value | 100 |
| Maturity Date | 260 weeks from the Issue Date |
| Non-Call Period | 52 weeks from the Issue Date |
| Coupon Dates | Every four weeks from the Issue Date, up to and including the Maturity Date |
| Autocallable Barrier | 100% |
| Principal Barrier Percentage | 60% |
| Coupon Barrier Percentage | 60% |

---

Total Return Swaps — A total return swap is a financial agreement between two parties where one party agrees to make a single payment or periodic payments to the other party based on a fixed or variable interest rate in exchange for a single payment or periodic payments based on the total return of an underlying asset, which includes both the income it generates and any capital gains or losses. Total return swaps also may be used as a means of obtaining exposure in markets where the reference asset is unavailable or it may otherwise be impossible or impracticable for the Fund to own that asset. "Total return" refers to the payment (or receipt) of the total return on the underlying reference asset, which is then exchanged for the receipt (or payment) of an interest rate. To the extent the total return of the underlying asset exceeds or falls short of the offsetting interest rate obligation, one party will receive a payment from or make a payment to the other party, as applicable. Total return swaps provide the Fund with the additional flexibility of gaining exposure to a market or sector index in a potentially more economical way. The use of total return swaps may add leverage to the Fund's portfolio.

Underlying Reference Index Methodology

The Underlying Reference Index employs a sophisticated approach to stabilizing volatility and dividend risk via:

1. Volatility Target: Maintains a predetermined volatility target of 35%, which helps create a more stable risk profile across varying market conditions.

2. Dynamic Exposure Adjustment: Calculates exposure to the Equity Component based on the ratio of the target volatility to the observed market volatility, with a maximum exposure cap of 5x (500%). Exposure is implemented via E-mini S&P 500 futures contracts.

3. Forward-Looking Volatility Measurement: Utilizes options market data to determine a near-term, forward-looking volatility level as implied by the listed options market, specifically using SPY options.

4. Weekly Rebalancing: The Underlying Reference Index rebalances weekly (on the last trading day of each week), with the leverage factor recalculated based on the prevailing volatility conditions.

5. Decrement: The Underlying Reference Index includes a fixed synthetic dividend (or "decrement") of 6% per annum, which is applied daily to the Index value. This daily decrement equals the 6% annual rate divided by 360 days (approximately 0.0167% per day) and is subtracted from the Index return regardless of the actual dividends paid by the constituent securities.

Index Construction and Calculation

The Underlying Reference Index is calculated daily according to the following methodology:

1. The Fair Value of the Variance Swap referenced by the Underlying Reference Index is calculated using options market data for SPY (SPDR S&P 500 ETF Trust) options, which serves as a forward-looking measure of implied volatility.

2. The leverage is determined as the ratio of the volatility target (35%) to the Fair Value of the Variance Swap referenced by the Underlying Reference Index, subject to the maximum exposure constraint of 5x.

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Calamos Autocallable Income ETF

3. The Underlying Reference Index exposure is adjusted based on this leverage calculation, providing higher exposure when market volatility is low and lower exposure when market volatility is high.

4. The Underlying Reference Index rebalances weekly to maintain the targeted volatility profile, with adjustments made based on the most recent volatility readings.

The Underlying Reference Index is calculated in U.S. dollars and was launched on February 11, 2022, with a base date of January 14, 2005.

By employing both volatility targeting and a fixed decrement, the Underlying Reference Index is designed particularly for use in structured product applications where a more predictable volatility profile and known dividend treatment are advantageous for pricing and risk management purposes.

Principal Risks

An investment in the Fund is subject to risks, and you could lose money on your investment in the Fund. There can be no assurance that the Fund will achieve its investment objective. You should not consider investing in the Fund if your investment objective differs from the Fund's investment objective or if you are not willing to accept the principal risks associated with an investment in the Fund. The risks associated with an investment in the Fund can increase during times of significant market volatility. Your investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The principal risks are presented in alphabetical order to facilitate finding particular risks and comparing them with other funds. Each risk summarized below is considered a "principal risk" of investing in the Fund, regardless of the order in which it appears. The principal risks of investing in the Fund include:

• Authorized Participant Concentration Risk — Only an Authorized Participant may engage in creation or redemption transactions directly with the Fund, and none of those Authorized Participants is obligated to engage in creation and/or redemption transactions.

• Autocallable Structure Risk — The Fund's returns are correlated to the performance of a theoretical portfolio of synthetic autocallable notes reflected by the Autocallable Index. Autocallable notes have specific structural features that may be unfamiliar to many investors:

• *Contingent Income Risk* — Coupon payments from the Autocallables are not guaranteed and will not be made if the Underlying Reference Index falls below the Coupon Barrier (60%) on observation dates. This means the Fund may generate significantly less income than anticipated during market downturns.

• *Early Redemption Risk* — Autocallables in the Index Portfolio may be called before their scheduled maturity if the Underlying Reference Index reaches or exceeds the Autocallable Barrier on observation dates. This automatic early redemption could force reinvestment of that portion of the Index Portfolio at lower rates if market yields have declined.

• *Barrier Risk* — If the Underlying Reference Index falls below the Maturity Barrier (60%) at the maturity of an Autocallable in the Index Portfolio, that portion of the Index Portfolio will be fully exposed to the negative performance of the Underlying Reference Index from its initial level. For example, if the Underlying Reference Index has declined 45% at maturity of a particular Autocall, the Index Portfolio of the Index Portfolio allocated to that note would lose 45% of its value. This conditional protection creates a binary outcome that can result in sudden, significant losses if barriers are breached.

• Calculation Methodology Risk — The Underlying Reference Index and the Autocallable Index employ complex calculation methodologies that may not perform as expected under certain market conditions.

• Cash Holdings Risk — To the extent the Fund holds cash positions, the Fund risks achieving lower returns and potential lost opportunities to participate in market appreciation which could negatively impact the Fund's performance and ability to achieve its investment objective.

• Correlation Risk — The Fund's return is not likely to match the expected returns of the Index Portfolio or the return of the Autocallable Index for a number of reasons, including the payment of periodic distributions to investors, operating expenses, transaction costs, cash management, market conditions, and differences in calculation methodologies.

• Costs of Buying and Selling Fund Shares — Due to the costs of buying or selling Fund Shares, including brokerage commissions imposed by brokers and bid/ask spreads, frequent trading of Fund Shares may significantly reduce investment results and an investment in Fund Shares may not be advisable for investors who anticipate regularly making small investments.

• Counterparty Risk — The Fund will be subject to credit risk with respect to the counterparties to the derivative contracts (primarily Swap Agreements) entered into by the Fund. The Fund's exposure to the Index Portfolio is obtained entirely through Swap Agreements with Swap Counterparties. If a Swap Counterparty becomes bankrupt or otherwise fails to perform its obligations, the Fund may experience significant delays in obtaining any recovery, may obtain only a limited recovery, or may obtain no recovery at all. Unlike directly held securities, the Fund's holdings consist primarily of contractual claims against Swap Counterparties, making the Fund particularly vulnerable to counterparty failure. Even temporary disruptions in a Swap Counterparty's ability to perform under Swap Agreements could significantly impact Fund performance. The Fund may have substantial exposure to a single Swap Counterparty, which may result in the Fund being more susceptible to a single economic or regulatory occurrence affecting such Swap Counterparty.

• Credit Risk — The Fund's collateral investments may be subject to credit risk, which is the risk that an issuer or counterparty will fail to pay principal or interest when due.

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Calamos Autocallable Income ETF

• Derivatives Risk — Derivatives are instruments, such as swaps, options, futures and forward foreign currency contracts, whose value is derived from that of other assets, rates or indices. Derivatives can be used for hedging (attempting to reduce risk by offsetting one investment position with another) or non-hedging purposes. The use of derivatives for non-hedging purposes may be considered more speculative than other types of investments. The use of derivatives will increase expenses and volatility, and there is no guarantee that a derivatives strategy will work as anticipated. Changes in the value of a derivative may not correlate perfectly with the underlying asset, rate or index, and the Fund could lose more than the principal amount invested.

• Equity Securities Risk — The securities markets are volatile. The Fund's exposure to the Underlying Reference Index subjects it to risks associated with equity markets. The value of the Underlying Reference Index may fluctuate, sometimes rapidly and unpredictably, due to factors affecting the U.S. equity markets generally or particular segments of the market. If the market prices of the securities to which the Underlying Reference Index is exposed decline, the value of your investment in the Fund will decline.

• Index Risk — The Underlying Reference Index employs a volatility targeting mechanism which may not perform as expected. The Underlying Reference Index may reduce equity exposure during periods that subsequently see strong equity performance, potentially limiting upside participation. The use of implied volatility rather than realized volatility may not accurately predict future market volatility. The weekly rebalancing frequency may not respond quickly enough to rapid market changes. The decrement feature (6% per annum) reduces index performance by a fixed percentage and may cause the Underlying Reference Index to underperform during low-return environments.

&nbsp;&nbsp;&nbsp;&nbsp;There can be no guarantee that the Underlying Reference Index or the Autocallable Index will be maintained indefinitely or that the Fund will be able to continue to utilize the Underlying Reference Index or the Autocallable Index to implement the Fund's principal investment strategies indefinitely. If necessary, the Adviser or the Fund's Board of Trustees may substitute the Underlying Reference Index or the Autocallable Index with another index that it chooses in its sole discretion and without advance notice to shareholders. There can be no assurance that any substitute index so selected will perform in a manner similar to the Underlying Reference Index or the Autocallable Index, as applicable. Unavailability of either index could affect adversely the ability of the Fund to achieve its investment objective. In addition, the Fund's investments in derivatives relating to the Autocallable Index may underperform the return of the Autocallable Index.

• Interest Rate Risk — The value of the Fund's fixed-income investments may be affected by changes in interest rates. When interest rates rise, the value of fixed-income investments generally falls.

• Investment in a Subsidiary — As determined necessary or advisable by the Fund, the Fund may invest a portion of its assets in a wholly-owned subsidiary (each, a "Subsidiary"), organized under the laws of the Cayman Islands. Investment in the Subsidiary is expected to provide the Fund with exposure to the Autocallable Index within the limitations of Subchapter M of the Code and Internal Revenue Service guidance. The Subsidiary may invest primarily in derivative instruments, including Swap Agreements. To the extent that the Fund invests in the Subsidiary, the Fund may be subject to the risks associated with the above-mentioned derivative instruments and other securities, which are discussed elsewhere in the Fund's Prospectus and this SAI. To comply with the asset diversification test applicable to a RIC (discussed elsewhere in this SAI), the Fund intends to limit its investments in such subsidiary to 25% of the Fund's total assets at the end of each taxable quarter.

&nbsp;&nbsp;&nbsp;&nbsp;Although the Subsidiary may be considered similar to investment companies, it is not registered under the 1940 Act and, unless otherwise noted in the Fund's Prospectus and this SAI, is not subject to all of the investor protections of the 1940 Act and other U.S. regulations. Changes in the laws of the United States and/or the Cayman Islands could result in the inability of the Fund and/or a Subsidiary to operate as described in the Fund's Prospectus and SAI and could negatively affect the Fund and its shareholders.

• Laddered Portfolio Risk — The laddered portfolio strategy may not perform as expected if market conditions remain unfavorable over an extended period, multiple Autocallable instruments may experience losses simultaneously and/or the weekly rebalancing mechanism may result in suboptimal entry points during rapidly changing markets.

• Liquidity Risk — Liquidity risk exists when particular investments are difficult to purchase or sell. The Fund's investments in illiquid securities may reduce the returns of the Fund because it may be unable to sell the illiquid securities at an advantageous time or price.

• Market Maker Risk — If the Fund has lower average daily trading volumes, it may rely on a small number of third-party market makers to provide a market for the purchase and sale of Fund Shares. Any trading halt or other problem relating to the trading activity of these market makers could result in a dramatic change in the spread between the Fund's net asset value and the price at which the Fund Shares are trading on the Exchange, which could result in a decrease in value of the Fund Shares. In addition, decisions by market makers or authorized participants to reduce their role or step away from these activities in times of market stress could inhibit the effectiveness of the arbitrage process in maintaining the relationship between the underlying values of the Fund's portfolio securities and the Fund's market price. This reduced effectiveness could result in Fund Shares trading at a discount to net asset value and also in greater than normal intra-day bid-ask spreads for Fund Shares.

• Market Risk — The risk that the securities markets will increase or decrease in value is considered market risk and applies to any security, including those held by the Index Portfolio.

• New Fund Risk — The Fund is a recently organized investment company with a limited operating history. As a result, prospective investors have a limited track record or history on which to base their investment decision.

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Calamos Autocallable Income ETF

• Non-Diversification Risk — The Fund is classified as "non-diversified" under the 1940 Act. As a result, the Fund is only limited as to the percentage of its assets which may be invested in the securities of any one issuer by the diversification requirements imposed by the Code. In addition, this makes the Fund more susceptible to risks associated with a single economic, political, or regulatory occurrence.

• Premium-Discount Risk — Fund Shares may trade above or below their NAV. The market prices of Fund Shares will generally fluctuate in accordance with changes in NAV as well as the relative supply of, and demand for, Fund Shares on the Exchange. The trading price of Fund Shares may deviate significantly from NAV during periods of market volatility.

• Secondary Market Trading Risk — Investors buying or selling Fund Shares in the secondary market will pay brokerage commissions or other charges imposed by brokers as determined by that broker. Brokerage commissions are often a fixed amount and may be a significant proportional cost for investors seeking to buy or sell relatively small amounts of Fund Shares. Although the Fund Shares are listed on the Exchange, there can be no assurance that an active or liquid trading market for them will develop or be maintained. The Fund's shares may trade at prices substantially different from NAV during periods of market stress or when the complex underlying derivatives are difficult to value. In addition, trading in Fund Shares on the Exchange may be halted.

• Swap Agreement Risk — Swap agreements are a type of derivative instrument that subjects the Fund to counterparty credit, liquidity, and correlation risks, including that: (i) the Fund may not be able to enter into replacement swap agreements in the event a current swap is terminated (ii) unfunded swap agreements may involve greater leverage risks than funded swaps; (iii) the swap agreement may not reflect the performance of the Autocallable Index or the Underlying Reference Index as expected due to differences in calculation methods or expenses; and (iv) during market disruptions, the Fund may be unable to enter into new swap agreements or adjust existing positions at favorable prices. In volatile markets, the Fund may not be able to close out a position without incurring a significant amount of loss.

• Swap Agreement Termination Risk — A Swap Counterparty may be entitled to terminate the Swap Agreement at its then current market value upon the occurrence of certain extraordinary market events or at its discretion upon notice to the Fund. Under such circumstances, if the Adviser is unable to enter into new Swap Agreements with a suitable Swap Counterparty, the Adviser may recommend to the Board of Trustees to immediately liquidate the Fund. A liquidation can be initiated by the Board of Trustees without a shareholder vote. While shareholder interests will be the paramount consideration in a liquidation under such circumstances, the timing of the liquidation may not be favorable to certain individual shareholders.

• Tax Risk — The Fund intends to elect and to qualify each year to be treated as a regulated investment company ("RIC") under Subchapter M of the Code. To qualify and maintain its status as a RIC, the Fund must derive at least 90% of its gross income each year from "qualifying income," meet certain diversification tests at the end of each quarter and meet an annual distribution test. For purposes of the qualifying income requirement, the treatment of the swaps and other derivatives that provide exposure to the synthetic Autocallables is not entirely clear, and thus whether the income and gain therefrom is qualifying income is uncertain. If the Fund were to treat income or gain from particular instruments linked to the synthetic Autocallables as qualifying income, an adverse determination or future guidance by the Internal Revenue Service with respect to the treatment of income or gain from those investments may adversely affect the Fund's ability to qualify as a RIC. For purposes of the diversification test, the identification of the issuer (or, in some cases, issuers) of a particular Fund investment can depend on the terms and conditions of that investment. In particular, there is no published Internal Revenue Service guidance or case law on how to determine the "issuer" of certain derivatives that the Fund will enter into. An adverse determination or future guidance by the Internal Revenue Service with respect to issuer identification for the Fund's investments may adversely affect the Fund's ability to qualify as a RIC. If the Fund does not qualify as a RIC for any taxable year and certain relief provisions are not available, the Fund's taxable income will be subject to tax at the Fund level and to a further tax at the shareholder level when such income is distributed.

• Trading Issues Risk — Trading in Fund Shares on the Exchange may be halted due to market conditions or for reasons that, in the view of the Exchange, make trading in shares inadvisable. Further, there can be no assurance that the requirements of the Exchange necessary to maintain the listing of the Fund will continue to be met or will remain unchanged.

• Valuation Risk — The complex nature of autocallable structures and volatility-targeted indices may make accurate valuation difficult during market stress, potentially leading to significant premiums or discounts to NAV. In addition, during periods of reduced market liquidity or in the absence of readily available market quotations for the holdings of the Fund, the ability of the Fund to value the Swap Agreements may become more difficult.

• Volatility Target Index Risk — The Underlying Reference Index employs a volatility targeting mechanism which introduces specific risks:

(i) Decrement Feature Impact: The 6% per annum decrement creates a constant performance drag that may cause significant underperformance relative to the S&P 500 during low-return environments or periods of sideways markets;

(ii) Implied Volatility Limitations: The use of SPY weekly options prices to determine implied volatility may not accurately forecast actual market volatility, potentially resulting in suboptimal allocation decisions;

(iii) Rebalancing Frequency Risk: The weekly rebalancing schedule may be too infrequent during rapidly changing market conditions, potentially exposing the Fund to higher volatility than targeted; and

(iv) Participation Limitation: During periods of rising markets that follow volatility spikes, the Underlying Reference Index may maintain reduced equity exposure, potentially limiting the Fund's participation in market recoveries.

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Calamos Autocallable Income ETF

Fund Performance

The Fund had not commenced operations as of the date of this prospectus. Once available, the Fund's performance information, and information that gives some indication of the risks of an investment in the Fund by comparing the Fund's performance with a broad measure of market performance, will be available on the Fund's website at www.calamos.com. Past performance (before and after taxes) is not an indication of future performance.

Investment Adviser

Calamos Advisors LLC ("Calamos Advisors" or the "Adviser")

Portfolio Managers

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| | | |
|:---|:---|:---|
| PORTFOLIO MANAGER/FUND TITLE (IF APPLICABLE) | PORTFOLIO MANAGER EXPERIENCE IN THE FUND | PRIMARY TITLE WITH ADVISER |
| Shaheen Iqubal | Since June 25, 2025 | SVP, Co-Portfolio Manager |
| Jordan Rosenfeld | Since June 25, 2025 | VP, Co-Portfolio Manager |

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Other Important Information Regarding Fund Shares

Portfolio Holdings. The Fund's portfolio holdings are disclosed on its website daily after the close of trading on the Exchange and prior to the opening of trading on the Exchange the following day. A description of the Fund's policies and procedures with respect to the disclosure of the Fund's portfolio holdings is available in the Fund's Statement of Additional Information ("SAI").

Premium/Discount Information. Information about the premiums and discounts at which the Fund's Shares have traded will be available at www.calamos.com.

Purchase and Sale of Fund Shares

The Fund will issue (or redeem) Fund Shares to certain institutional investors (typically market makers or other broker-dealers) only in large blocks of Fund Shares known as "Creation Units." Creation Unit transactions are conducted in exchange for the deposit or delivery of a designated portfolio of in-kind securities and/or cash.

Individual Fund Shares may only be purchased and sold on the Exchange, other national securities exchanges, electronic crossing networks and other alternative trading systems through your broker-dealer at market prices. Because Fund Shares trade at market prices rather than at net asset value ("NAV"), Fund Shares may trade at a price greater than NAV (premium) or less than NAV (discount). When buying or selling Fund Shares in the secondary market, you may incur costs attributable to the difference between the highest price a buyer is willing to pay to purchase Fund Shares (bid) and the lowest price a seller is willing to accept for Fund Shares (ask) (the "bid-ask spread"). Recent information regarding the Fund's NAV, market price, premiums and discounts, and bid-ask spreads is available at https://www.calamos.com/.

Tax Information

Net investment income and capital gains distributions you receive from the Fund generally are subject to federal income taxes and may also be subject to state and local taxes. The Fund intends to make distributions monthly and distribute long-term capital gains, if any, at least annually.

Payments to Broker-Dealers and Other Financial Intermediaries

If you purchase shares of the Fund through a broker-dealer or other financial intermediary (such as a bank), the Fund and its related companies may pay the intermediary for the sale of Fund Shares and related services. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your salesperson to recommend the Fund over another investment. Ask your salesperson or visit your financial intermediary's website for more information.

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Calamos Autocallable Income ETF

2020 Calamos Court<br>Naperville, IL 60563-2787<br>866.363.9219<br>www.calamos.com<br>811-22887

CAIESUMPRO 062525

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