The Fund is a non-diversified, actively managed fund that, under normal market conditions, seeks to invest at least 80% of its total assets in U.S. Treasuries and other U.S. government obligations, cash, cash equivalents, other investment companies, box spreads 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 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, are 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. The Fund’s portfolio will be comprised of unfunded total return swaps, U.S. Treasuries and other U.S. government obligations, cash, cash equivalents, other investment companies and “box spreads”. The Fund expects to invest substantially all of its assets in U.S. Treasury securities with remaining maturities of one (1) year or less and other U.S. government securities, cash, cash equivalents, “box spreads” (which may include investment in box-spread ETFs), other investment companies 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 reaches or exceeds a certain level (the “Coupon Barrier”). Each synthetic Autocallable employs a “memory” or what may be commonly referred to as a “snowball” feature where each unpaid Coupon is not lost but is carried forward and will be credited to the Fund on the next, if any, Observation Date on which the Coupon Barrier is met.

Each synthetic Autocallable is subject to a one-year non-callable period from the date of issuance (the “Non-Callable Period”). Following the Non-Callable Period, 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. 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 Autocallable, 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 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 will also utilize “box spreads” that consist of a synthetic long position coupled with an offsetting synthetic short position through a combination of options contracts (“Box Spreads”).

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. The Subsidiary will not be registered under the Investment Company Act of 1940, as amended (the “1940 Act”). To the extent that Calamos Advisors serves as the investment adviser to the Subsidiary, it will comply with Section 15 of the 1940 Act with respect to advisory contract approval. The Fund will comply with Section 8 and Section 18 of the 1940 Act, governing investment policies and capital structure and leverage, respectively, on an aggregate basis with the Subsidiary. The Subsidiary will also comply with Section 17 of the 1940 Act relating to affiliated transactions and custody.

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) payment of unpaid Coupons at maturity if the level of the Underlying Reference Index is at or above the Coupon Barrier (as set forth below) on an observation date;

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.

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 set forth in more detail in the table below):

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

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:

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 50% of the level of an Underlying Reference Index as of the date the synthetic Autocallable is issued:

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 Underlying Reference 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 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:

Investment Types

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.

Box Spreads — A Box Spread is an offsetting set of options, which may include Flexible Exchange Options (“FLEX Options”). Box Spreads consist of a synthetic long position coupled with an offsetting synthetic short position through a combination of options contracts on a reference asset at the same expiration date. The synthetic long position consists of (i) buying a call option and (ii) selling a put option, each on the same reference asset and each with the same strike price and expiration date. The synthetic short position consists of (i) buying a put option and (ii) selling a call option, each on the same reference asset and each with the same expiration date as the synthetic long but with a different strike price from the synthetic long position. The difference between the strike prices of the synthetic long position and the synthetic short position determines the expiration value (or value at maturity) of the Box Spread. An important feature of the Box Spread construction process is that it seeks to eliminate market risk tied to price movements associated with the underlying options’ reference asset. Once the Box Spread is initiated, its return from the initiation date through expiration will not change due to price movements in the underlying options’ reference assets. The Fund may purchase Box Spreads on various indices or securities based on risk and return considerations. Box Spreads are expected to have return characteristics similar to cash equivalents. The Fund may also invest in other exchange-traded funds which in turn invest principally in Box Spreads.

General Information about FLEX Options

FLEX Options are customizable exchange-traded option contracts guaranteed for settlement by the Options Clearing Corporation (the “OCC”). The OCC guarantees performance by each of the counterparties to the FLEX Options, becoming the “buyer for every seller and the seller for every buyer,” with the goal of protecting clearing members and options traders from counterparty risk. The OCC may make adjustments to FLEX Options for certain significant events, as more fully described in the Fund’s Statement of Additional Information. Although guaranteed for settlement by the OCC, FLEX Options are still subject to counterparty risk with the OCC and subject to the risk that the OCC may fail to perform the settlement of the FLEX Options due to bankruptcy or other adverse reasons. The FLEX Options that the Fund will hold and that reference the State Street® SPDR® S&P 500® ETF (“SPY”) will give the Fund the right or the obligation to either receive or deliver shares of SPY, or the right or the obligation to either receive or deliver a cash payment on the option expiration date based upon the difference between

SPY’s value and a strike price, depending on whether the option is a put or call option and whether the Fund purchases or sells the option. The Fund will purchase call options (giving the Fund the right to receive shares of SPY or a cash payment) and put options (giving the Fund the right to deliver shares of SPY or a cash payment), while simultaneously selling (i.e., writing) call options (giving the Fund the obligation to deliver shares of SPY or a cash payment). The Fund intends to use FLEX Options in constructing Box Spreads. The Fund receives premiums in exchange for the written FLEX Options and pays premiums in exchange for the purchased FLEX Options. The OCC and securities exchanges on which the FLEX Options are listed do not charge ongoing fees to writers or purchasers of the FLEX Options during their life for continuing to hold the option contracts but may charge transaction fees.

Underlying Reference Index Methodology

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

Index Construction and Calculation

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

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.