AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MARCH 31, 2004

1933 Act File No. 333-
1940 Act File No. 811-
U.S. SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM N-2

(CHECK APPROPRIATE BOXES)

[X] REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
[ ] PRE-EFFECTIVE AMENDMENT NO.
[ ] POST-EFFECTIVE AMENDMENT NO.
and/or
[X] REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940
[ ] AMENDMENT NO. 1
CALAMOS GLOBAL TOTAL RETURN FUND
Exact Name of Registrant as Specified in Charter

1111 East Warrenville Road, Naperville, Illinois 60563-1493
Address of Principal Executive Offices (Number, Street, City, State, Zip Code)

(630) 245-7200
Registrant's Telephone Number, including Area Code

James S. Hamman, Jr.
Secretary
Calamos Asset Management, Inc.
1111 East Warrenville Road
Naperville, Illinois 60563-1493

Name and Address (Number, Street, City, State, Zip Code) of Agent for Service

COPIES OF COMMUNICATIONS TO:

            David A. Sturms                                    Cameron S. Avery
Vedder, Price, Kaufman & Kammholz, P.C.                    Bell, Boyd & Lloyd, LLC
           222 North LaSalle                                70 West Madison Street
           Chicago, IL 60601                                      Suite 3300
                                                            Chicago, IL 60602-4207

APPROXIMATE DATE OF PROPOSED PUBLIC OFFERING: As soon as practicable after the
effective date of this Registration Statement

If any of the securities being registered on this Form will be offered on a delayed or continuous basis in reliance on Rule 415 under the Securities Act of 1933, as amended (the "Securities Act"), other than securities offered in connection with a dividend or interest reinvestment plans, check the following box. [ ]

It is proposed that this filing will become effective (check appropriate box)

[ ] when declared effective pursuant to section 8(c).

CALCULATION OF REGISTRATION FEE UNDER THE SECURITIES ACT OF 1933

-----------------------------------------------------------------------------------------------------------------------------
-----------------------------------------------------------------------------------------------------------------------------
                                                                                PROPOSED MAXIMUM
    TITLE OF SECURITIES              AMOUNT            PROPOSED MAXIMUM        AGGREGATE OFFERING            AMOUNT OF
      BEING REGISTERED          BEING REGISTERED    OFFERING PRICE PER UNIT         PRICE(1)            REGISTRATION FEE(2)
-----------------------------------------------------------------------------------------------------------------------------
Common Shares (no par
  value)....................         1,000                  $15.00                   $15,000                   $1.90
-----------------------------------------------------------------------------------------------------------------------------
-----------------------------------------------------------------------------------------------------------------------------

(1) Estimated solely for the purpose of calculating the registration fee.

(2) Transmitted prior to the filing date.

THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL FILE A FURTHER AMENDMENT, WHICH SPECIFICALLY STATES THIS REGISTRATION STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF THE SECURITIES ACT OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A), MAY DETERMINE.


The information in this prospectus is not complete and may be changed. We may not sell these securities until the registration statement filed with the securities and exchange commission is effective. This prospectus is not an offer to sell these securities and it is not soliciting an offer to buy these securities in any state where the offer or sale is not permitted.

                             SUBJECT TO COMPLETION

                 PRELIMINARY PROSPECTUS DATED           , 2004

PROSPECTUS

                                              SHARES

CALAMOS GLOBAL TOTAL RETURN FUND
COMMON SHARES

$ PER SHARE

Investment Objectives. Calamos Global Total Return Fund (the "Fund") is a newly organized, diversified, closed-end management investment company. The Fund's investment objective is to provide total return, through a combination of capital appreciation and current income.

Portfolio Contents. Under normal circumstances, the Fund will invest primarily in a portfolio of common and preferred stocks, convertible securities and income producing securities such as investment grade and below investment grade (high yield/high risk) debt securities. The Fund, under normal circumstances, will invest at least 50% of its managed assets in equity securities (including securities that are convertible into equity securities). The Fund may invest up to 100% of its managed assets in securities of foreign issuers, including debt and equity securities of corporate issuers and debt securities of government issuers, in developed and emerging markets. However, the Fund will invest in securities of at least three countries, which may include the United States. "Managed assets" means the total assets of the Fund
(including any assets attributable to any leverage that may be outstanding)
minus the sum of accrued liabilities (other than debt representing financial leverage). For this purpose the liquidation preference on any preferred shares will not constitute a liability. Below investment grade (high yield/high risk) securities are rated Ba or lower by Moody's Investors Service, Inc. ("Moody's") or BB or lower by Standard & Poor's, a division of The McGraw-Hill Companies, Inc. ("Standard & Poor's") or are unrated securities of comparable quality as determined by the Fund's investment adviser. Below investment grade securities are commonly referred to as "junk bonds" and are considered speculative with respect to the issuer's capacity to pay interest and repay principal. They involve greater risk of loss, are subject to greater price volatility and are less liquid, especially during periods of economic uncertainty or change, than higher rated securities. There can be no assurance that the Fund will achieve its investment objective.

NO PRIOR HISTORY. BECAUSE THE FUND IS NEWLY ORGANIZED, ITS COMMON SHARES HAVE NO HISTORY OF PUBLIC TRADING. SHARES OF CLOSED-END FUNDS FREQUENTLY TRADE AT A DISCOUNT FROM THEIR NET ASSET VALUE. THE RISK OF LOSS DUE TO A MARKET DISCOUNT MAY BE GREATER FOR INITIAL INVESTORS EXPECTING TO SELL THEIR SHARES IN A RELATIVELY SHORT PERIOD AFTER COMPLETION OF THE PUBLIC OFFERING. The common shares are expected to be listed on the New York Stock Exchange under the symbol " ."

(continued on following page)

INVESTING IN THE FUND'S COMMON SHARES INVOLVES RISKS THAT ARE DESCRIBED IN
THE "RISK FACTORS" SECTION BEGINNING ON PAGE OF THIS PROSPECTUS.

                                                              PER SHARE        TOTAL(2)
                                                              ---------        --------
Public offering price.......................................   $15.00          $
Sales load..................................................   $  .675         $
Estimated offering expenses.................................   $  .03          $
Proceeds, after expenses, to the Fund(1)....................   $14.295         $

(1) Total organizational expenses and offering costs (other than the sales load, but including reimbursement of underwriter expenses of $ per share) are estimated to be $ or $ per share. Calamos has agreed to pay organizational expenses of the Fund and to pay offering costs of the Fund (other than sales load, but including reimbursement of underwriter expenses of $ per share) that exceed $.03 per share.

(2) The Fund has granted the underwriters an option to purchase up to additional common shares at the public offering price less the sales load, solely to cover overallotments, if any. If such option is exercised in full, the total public offering price, sales load, estimated offering expenses and proceeds to the Fund will be $ , $ , $ and $ , respectively. See "Underwriting."

The underwriters may also purchase up to an additional common shares at the public offering price, less the sales load, within 45 days from the date of this prospectus to cover overallotments.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

The common shares will be ready for delivery on or about          , 2004.
                         ----------------------
                             [UNDERWRITERS]
                         ----------------------
            The date of this prospectus is           , 2004.


(continued from previous page)

Investment Adviser. Calamos Asset Management, Inc. ("Calamos") is the Fund's investment adviser. See "Management of the Fund."

Leverage. The Fund may, but is not required to, issue preferred shares, borrow money or issue debt securities. These practices are known as leverage. The Fund currently anticipates that it will issue cumulative preferred shares, as soon as practicable after the closing of this offering, with an aggregate liquidation preference of up to approximately 33% of the Fund's total assets immediately after issuance. As a non-fundamental policy, such preferred shares or borrowings may not exceed 38% of the Fund's total assets. The Fund may not be leveraged at all times and the amount of borrowings or leverage, if any, may vary depending upon a variety of factors, including Calamos' outlook for the market and the costs that the Fund would incur as a result of such leverage. The use of preferred shares or borrowing to leverage the common shares creates risks. See "Risk Factors -- Leverage" beginning on page of this prospectus.

You should read this prospectus, which contains important information about the Fund, before deciding whether to invest in the Fund's common shares, and retain it for future reference. A statement of additional information, dated , 2004, containing additional information about the Fund, has been filed with the Securities and Exchange Commission (the "Commission") and is incorporated by reference in its entirety into this prospectus. You may request a free copy of the statement of additional information, the table of contents of which is on page of this prospectus, by calling 1-800-582-6959 or by writing to the Fund. You can review and copy documents the Fund has filed at the Commission's Public Reference Room in Washington, D.C. Call 1-202-942-8090 for information. The Commission charges a fee for copies. You can get the same information free from the Commission's EDGAR database on the Internet (http://www.sec.gov). You may also e-mail requests for these documents to publicinfo@sec.gov or make a request in writing to the Commission's Public Reference Section, Washington, D.C. 20549-0102.

The Fund's common shares do not represent a deposit or obligation of, and are not guaranteed or endorsed by, any bank or other insured depository institution and are not federally insured by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.


TABLE OF CONTENTS

                                                              PAGE
                                                              ----
Prospectus Summary..........................................    1
Summary of Fund Expenses....................................   13
The Fund....................................................   14
Use of Proceeds.............................................   14
Investment Objective and Principal Investment Strategies....   15
Leverage....................................................   18
Interest Rate Transactions..................................   21
Risk Factors................................................   23
Management of the Fund......................................   29
Dividends and Distributions; Automatic Dividend Reinvestment
  Plan......................................................   31
Closed-End Fund Structure...................................   34
U.S. Federal Income Tax Matters.............................   35
Net Asset Value.............................................   37
Description of Shares.......................................   38
Certain Provisions of the Agreement and Declaration of Trust
  and By-Laws...............................................   40
Underwriting................................................   42
Custodian, Transfer Agent and Dividend Disbursing Agent.....   44
Legal Opinions..............................................   44
Table of Contents for Statement of Additional Information...   45


YOU SHOULD RELY ONLY ON THE INFORMATION CONTAINED OR INCORPORATED BY REFERENCE IN THIS PROSPECTUS. WE HAVE NOT, AND THE UNDERWRITERS HAVE NOT, AUTHORIZED ANY OTHER PERSON TO PROVIDE YOU WITH DIFFERENT INFORMATION. IF ANYONE PROVIDES YOU WITH DIFFERENT OR INCONSISTENT INFORMATION, YOU SHOULD NOT RELY ON IT. WE ARE NOT, AND THE UNDERWRITERS ARE NOT, MAKING AN OFFER TO SELL THESE SECURITIES IN ANY JURISDICTION WHERE THE OFFER OR SALE IS NOT PERMITTED. YOU SHOULD ASSUME THAT THE INFORMATION CONTAINED IN THIS PROSPECTUS IS ACCURATE ONLY AS OF THE DATE OF THIS PROSPECTUS. OUR BUSINESS, FINANCIAL CONDITION AND PROSPECTS MAY HAVE CHANGES SINCE THAT DATE.

i

PROSPECTUS SUMMARY

This is only a summary. This summary does not contain all of the information that you should consider before investing in the Fund's common shares. You should review the more detailed information contained in this prospectus and in the statement of additional information, especially the information set forth under the heading "Risk Factors."

THE FUND......................   Calamos Global Total Return Fund is a newly
                                 organized, diversified, closed-end management
                                 investment company. Throughout the prospectus,
                                 we refer to Calamos Global Total Return Fund as
                                 the "Fund" or as "we," "us," or "our." See "The
                                 Fund."

THE OFFERING..................   The Fund is offering common shares of
                                 beneficial interest ("common shares") at an
                                 initial offering price of $15.00 per share. The
                                 common shares are being offered by a group of
                                 underwriters led by           . You must
                                 purchase at least 100 common shares ($1,500) in
                                 order to participate in the offering. The Fund
                                 has granted the underwriters the right to
                                 purchase up to an additional           common
                                 shares at the public offering price, less the
                                 sales load, within 45 days from the date of
                                 this prospectus to cover overallotments.
                                 Calamos has agreed to pay organizational
                                 expenses and offering costs (other than sales
                                 load, but including reimbursement of
                                 underwriter expenses of $  per share) that
                                 exceed $.03 per share. See "Underwriting."

INVESTMENT OBJECTIVE..........   The Fund's investment objective is to provide
                                 total return, through a combination of capital
                                 appreciation and current income. There can be
                                 no assurance that the Fund will achieve its
                                 investment objective. See "Investment Objective
                                 and Principal Investment
                                 Strategies -- Investment Objective."

INVESTMENT POLICIES...........   Primary Investments.  Under normal
                                 circumstances, the Fund will invest primarily
                                 in a [globally diversified] portfolio of common
                                 and preferred stocks and income producing
                                 securities such as investment grade and below
                                 investment grade (high yield/high risk) debt
                                 securities. The Fund, under normal
                                 circumstances, will invest at least 50% of its
                                 managed assets in equity securities (including
                                 securities that are convertible into equity
                                 securities). The Fund may invest up to 100% of
                                 its managed assets in securities of foreign
                                 issuers, including debt and equity securities
                                 of corporate issuers and debt securities of
                                 government issuers, in developed and emerging
                                 markets. The Fund will invest in securities of
                                 at least three countries, which may include the
                                 United States. "Managed assets" means the total
                                 assets of the Fund (including any assets
                                 attributable to any leverage that may be
                                 outstanding) minus the sum of accrued
                                 liabilities (other than debt representing
                                 financial leverage). For this purpose the
                                 liquidation preference on any preferred shares
                                 will not constitute a liability.

                                 Calamos will dynamically allocate the Fund's
                                 investments among multiple asset classes,

seeking to obtain an appropriate balance of risk and reward through all market cycles using multiple strategies and combining them to seek to achieve favorable risk adjusted returns. See "Investment Objective and Principal Investment Strategies -- Principal Investment Strategies."

1

The Fund will attempt to keep a consistent balance between risk and reward over the course of different market cycles, through various combinations of stocks, bonds, and/or convertible securities, to achieve what the investment adviser believes to be an appropriate blend for the then current market. As the market environment changes, portfolio securities may change in an attempt to achieve a relatively consistent risk level over time. At some points in a market cycle, one type of security may make up a substantial portion of the Fund's portfolio, while at other times certain securities may have minimal or no representation, depending on market conditions. See "Investment Objective and Principal Investment Strategies -- Principal Investment Strategies."

Equity Securities. Equity securities include common and preferred stocks, warrants, rights, and depository receipts. Under normal circumstances, the Fund will invest at least 50% of its managed assets in equity securities (including securities that are convertible into equity securities). An investment in the equity securities of a company represents a proportionate ownership interest in that company. Therefore, the Fund participates in the financial success or failure of any company in which it has an equity interest.

High Yield Securities. The Fund may invest in high yield securities for either current income or capital appreciation or both. These securities are rated below investment grade (i.e., rated Ba or lower by Moody's or BB or lower by Standard & Poor's) or are unrated securities of comparable quality as determined by Calamos, the Fund's investment adviser. The Fund may invest in high yield securities of any rating. Non-convertible debt securities rated below investment grade are commonly referred to as "junk bonds" and are considered speculative with respect to the issuer's capacity to pay interest and repay principal. They involve greater risk of loss, are subject to greater price volatility and are less liquid, especially during periods of economic uncertainty or change, than higher rated securities. See "Investment Objective and Principal Investment Strategies -- Principal Investment Strategies -- High Yield Securities."

Foreign Issuers. The Fund may invest up to 100% of its managed assets in securities of foreign issuers, including debt and equity securities of corporate issuers and debt securities of government issuers, in developed and emerging markets. The Fund will invest in securities of at least three countries, which may include the United States. A foreign issuer is a company organized under the laws of a foreign country that is principally traded in the financial markets of a foreign country. For these purposes foreign securities do not include securities represented by American Depository Receipts ("ADRs") or securities guaranteed by a U.S. person. See "Investment Objective and Principal Investment Strategies -- Principal Investment Strategies -- Foreign Securities."

2

Convertible Securities. The Fund may invest in convertible securities. A convertible security is a debt security or preferred stock that is exchangeable for an equity security (typically of the same issuer) at a predetermined price (the "conversion price"). Depending upon the relationship of the conversion price to the market value of the underlying security, a convertible security may trade more like an equity security than a debt instrument. The Fund may invest in convertible securities of any rating. Securities that are convertible into equity securities are considered equity securities for purposes of the Fund's policy to invest at least 50% of its managed assets in equity securities. See "Investment Objective and Principal Investment Strategies -- Principal Investment Strategies -- Convertible Securities."

Synthetic Convertible Securities. Calamos may also create a "synthetic" convertible security by combining separate securities that possess the two principal characteristics of a true convertible security, i.e., a fixed-income security ("fixed-income component") and the right to acquire an equity security ("convertible component"). The fixed-income component is achieved by investing in non-convertible, fixed-income securities such as bonds, preferred stocks and money market instruments. The convertible component is achieved by investing in warrants or options to buy common stock at a certain exercise price, or options on a stock index. The Fund may also purchase synthetic securities created by other parties, typically investment banks, including convertible structured notes. Different companies may issue the fixed-income and convertible components which may be purchased separately, and at different times. The Fund's holdings of synthetic convertible securities are considered equity securities for purposes of the Fund's policy to invest at least 50% of its managed assets in equity securities. See "Investment Objective and Principal Investment Strategies -- Principal Investment Strategies -- Synthetic Convertible Securities."

Rule 144A Securities. The Fund may invest without limit in securities that have not been registered for public sale, but that are eligible for purchase and sale by certain qualified institutional buyers ("Rule 144A Securities"). See "Investment Objective and Principal Investment Strategies -- Principal Investment Strategies -- Rule 144A Securities."

Zero Coupon Securities. The securities in which the Fund invests may include zero coupon securities, which are debt obligations that are issued or purchased at a significant discount from face value. The discount approximates the total amount of interest the security will accrue and compound over the period until maturity or the particular interest payment date at a rate of interest reflecting the market rate of the security at the time of issuance. Zero coupon securities do not require the periodic payment of interest. These investments benefit the issuer by mitigating its need for cash to meet debt service, but generally require a higher rate of return to attract investors who are willing to defer receipt of cash. These investments may experience

3

                                 greater volatility in market value than U.S.
                                 government or other securities that make
                                 regular payments of interest. The Fund accrues
                                 income on these investments for tax and
                                 accounting purposes, which is distributable to
                                 shareholders and which, because no cash is
                                 received at the time of accrual, may require
                                 the liquidation of other portfolio securities
                                 to satisfy the Fund's distribution obligations,
                                 in which case the Fund will forgo the
                                 opportunity to purchase additional income
                                 producing assets with the liquidation proceeds.
                                 Zero coupon U.S. government securities include
                                 STRIPS and CUBES, which are issued by the U.S.
                                 Treasury as component parts of U.S. Treasury
                                 bonds and represent scheduled interest and
                                 principal payments on the bonds. See
                                 "Investment Objective and Principal Investment
                                 Strategies -- Principal Investment
                                 Strategies -- Zero Coupon Securities."

                                 Other Securities.  The Fund may invest in other
                                 securities of various types. Normally, the Fund
                                 invests substantially all of its assets to meet
                                 its investment objective. For temporary
                                 defensive purposes, the Fund may depart from
                                 its principal investment strategies and invest
                                 part or all of its assets in securities with
                                 remaining maturities of less than one year,
                                 cash equivalents, or may hold cash. During such
                                 periods, the Fund may not be able to achieve
                                 its investment objective. See "Investment
                                 Objective and Principal Investment
                                 Strategies -- Principal Investment Strategies."

USE OF LEVERAGE BY THE FUND...   The Fund may, but is not required to, use
                                 leverage by issuing preferred shares, borrowing
                                 money or issuing debt securities. The Fund
                                 currently anticipates that it will issue
                                 cumulative preferred shares, as soon as
                                 practicable after the closing of this offering,
                                 with an aggregate liquidation preference of up
                                 to approximately 33% of the Fund's total
                                 assets. As a non-fundamental policy, such
                                 preferred shares or borrowing may not exceed
                                 38% of the Fund's total assets. However, the
                                 Board of Trustees reserves the right to issue
                                 preferred shares or borrow to the extent
                                 permitted by the Investment Company Act of 1940
                                 (the "1940 Act"). See "Leverage." The Fund may
                                 not be leveraged at all times and the amount of
                                 borrowing or leverage, if any, may vary
                                 depending upon a variety of factors, including
                                 Calamos' outlook for the market and the costs
                                 that the Fund would incur as a result of such
                                 leverage. Leverage involves greater risks. The
                                 Fund's leveraging strategy may not be
                                 successful. By leveraging its investment
                                 portfolio, the Fund creates an opportunity for
                                 increased net income or capital appreciation.
                                 However, the use of leverage also involves
                                 risks, which can be significant. These risks
                                 include the possibility that the value of the
                                 assets acquired with the proceeds of leverage
                                 decreases although the Fund's liability to
                                 holders of preferred shares or other types of
                                 leverage is fixed, greater volatility in the
                                 Fund's net asset value and the market price of
                                 the Fund's common shares and higher expenses.
                                 In addition, the rights of lenders and the
                                 holders of preferred shares and debt securities
                                 issued by the Fund will be senior to the rights
                                 of the holders of common shares with respect to
                                 the

                                        4

                                 payment of dividends or upon liquidation.
                                 Holders of preferred shares will have voting
                                 rights in addition to and separate from the
                                 voting rights of common shareholders. See
                                 "Description of Shares -- Preferred Shares" and
                                 "Certain Provisions of the Agreement and
                                 Declaration of Trust and By-Laws." The holders
                                 of preferred shares, on the one hand, and the
                                 holders of the common shares, on the other, may
                                 have interests that conflict in certain
                                 situations. Since Calamos' management fee is
                                 based upon a percentage of the Fund's managed
                                 assets, which include assets attributable to
                                 any outstanding leverage, the investment
                                 management fee will be higher if the Fund is
                                 leveraged and Calamos will have an incentive to
                                 leverage the Fund. Calamos intends to leverage
                                 the Fund only when it believes that the
                                 potential return on additional investments
                                 acquired with the proceeds of leverage is
                                 likely to exceed the costs incurred in
                                 connection with the borrowing or issuance of
                                 preferred shares. The Fund will pay, and common
                                 shareholders will effectively bear, any costs
                                 and expenses relating to any borrowings and to
                                 the issuance and ongoing maintenance of
                                 preferred shares. Such costs and expenses
                                 include the higher management fee resulting
                                 from the use of any such leverage. See
                                 "Leverage" and "Risk Factors -- Leverage."

INTEREST RATE TRANSACTIONS....   In order to seek to reduce the interest rate
                                 risk inherent in the Fund's underlying
                                 investments and capital structure, the Fund, if
                                 market conditions are deemed favorable, likely
                                 will enter into interest rate swap or cap
                                 transactions to attempt to protect itself from
                                 increasing dividend or interest expenses on its
                                 leverage. The use of interest rate swaps and
                                 caps is a highly specialized activity that
                                 involves investment techniques and risks
                                 different from those associated with ordinary
                                 portfolio security transactions.

                                 In an interest rate swap, the Fund would agree
                                 to pay to the other party to the interest rate
                                 swap (which is known as the "counterparty") a
                                 fixed rate payment in exchange for the
                                 counterparty agreeing to pay to the Fund a
                                 payment at a variable rate that is expected to
                                 approximate the rate on any variable rate
                                 payment obligation on the Fund's leverage. The
                                 payment obligations would be based on the
                                 notional amount of the swap.

                                 In an interest rate cap, the Fund would pay a
                                 premium to the counterparty to the interest
                                 rate cap and, to the extent that a specified
                                 variable rate index exceeds a predetermined
                                 fixed rate, would receive from the counterparty
                                 payments of the difference based on the
                                 notional amount of such cap. Depending on the
                                 state of interest rates in general, the Fund's
                                 use of interest rate swap or cap transactions
                                 could enhance or harm the overall performance
                                 of the common shares. See "Interest Rate
                                 Transactions."

INVESTMENT ADVISER............   Calamos is the Fund's investment adviser.
                                 Calamos is responsible on a day-to-day basis
                                 for investment of the Fund's portfolio in
                                 accordance with its investment objective and
                                 policies. Calamos makes all investment
                                 decisions for the Fund and places purchase and
                                 sale orders for the Fund's portfolio
                                 securities. As of

                                        5

                                           , 2004, Calamos managed approximately
                                 $     billion in assets of individuals and
                                 institutions. Calamos is a wholly-owned
                                 subsidiary of Calamos Holdings, Inc.
                                 ("Holdings"). Holdings is controlled by John P.
                                 Calamos, who has been engaged in the investment
                                 advisory business since 1977.

                                 The Fund pays Calamos an annual fee, payable
                                 monthly, for its investment management services
                                 equal to 1.00% of the Fund's average weekly
                                 managed assets. See "Management of the Fund."

PORTFOLIO MANAGER.............   John P. Calamos, Nick P. Calamos and John P.
                                 Calamos, Jr. are responsible for managing the
                                 portfolio of the Fund. During the past five
                                 years, John P. Calamos has been a Chairman, CEO
                                 and Co-Chief Investment Officer of Calamos;
                                 Nick P. Calamos has been a Senior Executive
                                 Vice President and Co-Chief Investment Officer
                                 of Calamos; and John P. Calamos, Jr. has been
                                 an Executive Vice President of Calamos.

LISTING.......................   The common shares are expected to be listed on
                                 the New York Stock Exchange under the symbol

" ."

CUSTODIAN, TRANSFER AGENT AND

DIVIDEND DISBURSING AGENT.....   The Bank of New York will serve as the Fund's
                                 custodian, transfer agent and dividend
                                 disbursing agent. See "Custodian, Transfer
                                 Agent and Dividend Disbursing Agent."

FUND ACCOUNTANT...............   State Street Bank and Trust Company ("State
                                 Street") will provide fund accounting and
                                 financial accounting services to the Fund.

MARKET PRICE OF COMMON
SHARES........................   Common shares of closed-end investment
                                 companies frequently trade at prices lower than
                                 their net asset value. The Fund's net asset
                                 value will be reduced immediately following
                                 this offering by the sales load and the amount
                                 of the organization and offering expenses paid
                                 by the Fund. See "Use of Proceeds." In addition
                                 to net asset value, the market price of the
                                 Fund's common shares may be affected by such
                                 factors as the Fund's use of leverage, dividend
                                 stability, portfolio credit quality, liquidity,
                                 market supply and demand and the Fund's
                                 dividends paid (which are, in turn, affected by
                                 expenses), call protection for portfolio
                                 securities and interest rate movements. See
                                 "Leverage," "Risk Factors" and "Description of
                                 Shares." The Fund's common shares are designed
                                 primarily for long-term investors, and you
                                 should not purchase common shares if you intend
                                 to sell them shortly after purchase.

DISTRIBUTIONS.................   Subject to the discussion in the following
                                 paragraph, commencing with the Fund's first
                                 dividend, the Fund intends to distribute to
                                 common shareholders all or a portion of its net
                                 investment income monthly and net realized
                                 capital gains, if any, at least annually. The
                                 Fund expects to declare the initial monthly
                                 dividend on the common shares within
                                 approximately 60 days of the completion of this
                                 offering and to pay that initial monthly
                                 dividend approximately 90 days after the
                                 completion of this offering. At times, in order
                                 to maintain a stable level of distributions,
                                 the Fund may pay out less than all of its net

                                        6

                                 investment income or pay out accumulated
                                 undistributed income in addition to current net
                                 investment income.

                                 In January 2004, Calamos, on behalf of itself
                                 and certain funds, filed an exemptive
                                 application with the Commission seeking an
                                 order under the 1940 Act facilitating the
                                 implementation of a dividend policy calling for
                                 monthly distributions of a fixed percentage of
                                 its net asset value ("Managed Dividend
                                 Policy"). The application will be amended to
                                 include the Fund. If, and when, Calamos, on
                                 behalf of itself and other parties, receives
                                 the requested relief, the Fund may, subject to
                                 the determination of its Board of Trustees,
                                 implement a Managed Dividend Policy. Under a
                                 Managed Dividend Policy, if, for any
                                 distribution, net investment income and net
                                 realized capital gains were less than the
                                 amount of the distribution, the differences
                                 would be distributed from the Fund's assets.

                                 Pursuant to the Fund's Automatic Dividend
                                 Reinvestment Plan, unless a shareholder is
                                 ineligible or elects to receive distributions
                                 in cash, all dividends and capital gains
                                 distributions are automatically reinvested in
                                 additional common shares of the Fund. Since not
                                 all investors can participate in the Automatic
                                 Dividend Reinvestment Plan, you should contact
                                 your broker or nominee to confirm that you are
                                 eligible to participate in the plan. See
                                 "Dividends and Distributions; Automatic
                                 Dividend Reinvestment Plan."

RISKS.........................   No Operating History.  The Fund is a newly
                                 organized closed-end management investment
                                 company and has no operating history or history
                                 of public trading. See "Risk Factors -- No
                                 Operating History."

                                 Market Price of Shares.  Shares of closed-end
                                 funds frequently trade at a market price that
                                 is below their net asset value. This is
                                 commonly referred to as "trading at a
                                 discount." This characteristic of shares of
                                 closed-end funds is a risk separate and
                                 distinct from the risk that the Fund's net
                                 asset value may decrease. Investors who sell
                                 their shares within a relatively short period
                                 after completion of the public offering are
                                 likely to be exposed to this risk. Accordingly,
                                 the Fund is designed primarily for long-term
                                 investors and should not be considered a
                                 vehicle for trading purposes. Following the
                                 offering, net asset value will be reduced by
                                 the sales load and the amount of organizational
                                 and offering expenses paid by the Fund.
                                 Immediately following any offering of preferred
                                 shares, net asset value will be reduced by the
                                 costs of that offering paid by the Fund. See
                                 "Risk Factors -- Market Price of Shares."

                                 Equity Securities.  Equity investments are
                                 subject to greater fluctuations in market value
                                 than other asset classes as a result of such
                                 factors as the issuer's business performance,
                                 investor perceptions, stock market trends and
                                 general economic conditions. Equity securities
                                 are subordinated to bonds and other debt
                                 instruments in a company's capital structure in
                                 terms of priority to corporate income and
                                 liquidation payments.

                                        7

                                 High Yield Securities.  The Fund may invest in
                                 high yield securities of any rating. Investment
                                 in high yield securities involves substantial
                                 risk of loss. Below investment grade
                                 non-convertible debt securities or comparable
                                 unrated securities are commonly referred to as
                                 "junk bonds" and are considered predominantly
                                 speculative with respect to the issuer's
                                 ability to pay interest and principal and are
                                 susceptible to default or decline in market
                                 value due to adverse economic and business
                                 developments. The market values for high yield
                                 securities tend to be very volatile, and these
                                 securities are less liquid than investment
                                 grade debt securities. For these reasons, your
                                 investment in the Fund is subject to the
                                 following specific risks:

                                 - increased price sensitivity to changing
                                   interest rates and to a deteriorating
                                   economic environment;

                                 - greater risk of loss due to default or
                                   declining credit quality;

                                 - adverse company specific events are more
                                   likely to render the issuer unable to make
                                   interest and/or principal payments; and

                                 - if a negative perception of the high yield
                                   market develops, the price and liquidity of
                                   high yield securities may be depressed. This
                                   negative perception could last for a
                                   significant period of time.

                                 Adverse changes in economic conditions are more
                                 likely to lead to a weakened capacity of a high
                                 yield issuer to make principal payments and
                                 interest payments than an investment grade
                                 issuer. The principal amount of high yield
                                 securities outstanding has proliferated in the
                                 past decade as an increasing number of issuers
                                 have used high yield securities for corporate
                                 financing. An economic downturn could severely
                                 affect the ability of highly leveraged issuers
                                 to service their debt obligations or to repay
                                 their obligations upon maturity.

                                 The secondary market for high yield securities
                                 may not be as liquid as the secondary market
                                 for more highly rated securities, a factor
                                 which may have an adverse effect on the Fund's
                                 ability to dispose of a particular security.
                                 There are fewer dealers in the market for high
                                 yield securities than for investment grade
                                 obligations. The prices quoted by different
                                 dealers may vary significantly and the spread
                                 between the bid and asked price is generally
                                 much larger than for higher quality
                                 instruments. Under adverse market or economic
                                 conditions, the secondary market for high yield
                                 securities could contract further, independent
                                 of any specific adverse changes in the
                                 condition of a particular issuer, and these
                                 instruments may become illiquid. As a result,
                                 the Fund could find it more difficult to sell
                                 these securities or may be able to sell the
                                 securities only at prices lower than if such
                                 securities were widely traded. Prices realized
                                 upon the sale of such lower rated or unrated
                                 securities, under these circumstances, may be
                                 less than the prices used in calculating the
                                 Fund's net asset value. See "Risk
                                 Factors -- High Yield Securities."

                                        8

                                 Foreign Securities.  Investments in non-U.S.
                                 issuers may involve unique risks compared to
                                 investing in securities of U.S. issuers. These
                                 risks are more pronounced to the extent that
                                 the Fund invests a significant portion of its
                                 non-U.S. investments in one region or in the
                                 securities of emerging market issuers. These
                                 risks may include:

                                 - less information about non-U.S. issuers or
                                   markets may be available due to less rigorous
                                   disclosure or accounting standards or
                                   regulatory practices;

                                 - many non-U.S. markets are smaller, less
                                   liquid and more volatile and therefore in a
                                   changing market, Calamos may not be able to
                                   sell the Fund's portfolio securities at
                                   times, in amounts and at prices it considers
                                   reasonable;

                                 - the economies of non-U.S. countries may grow
                                   at slower rates than expected or may
                                   experience a downturn or recession;

                                 - economic, political and social developments
                                   may adversely affect the securities markets,
                                   including expropriation and nationalization;

                                 - the difficulty in obtaining or enforcing a
                                   court judgment in non-U.S. countries;

                                 - restrictions on foreign investments in
                                   non-U.S. jurisdictions;

                                 - difficulties in effecting the repatriation of
                                   capital invested in non-U.S. countries; and

                                 - withholding and other non-U.S. taxes may
                                   decrease the Fund's return.

See "Risk Factors -- Foreign Securities."

Currency Risk. The value of the securities denominated or quoted in foreign currencies may be adversely affected by fluctuations in the relative currency exchange rates and by exchange control regulations. The Fund's investment performance may be negatively affected by a devaluation of a currency in which the Fund's investments are denominated or quoted. Further, the Fund's investment performance may be significantly affected, either positively or negatively, by currency exchange rates because the U.S. dollar value of securities denominated or quoted in another currency will increase or decrease in response to changes in the value of such currency in relation to the U.S. dollar. See "Risk Factors -- Currency Risks."

Interest Rate Risk. In addition to the risks discussed above, debt securities, including high yield securities, are subject to certain risks, including the following:

- If interest rates go up, the value of debt securities in the Fund's portfolio generally will decline.

- During periods of declining interest rates, the issuer of a security may exercise its option to prepay principal earlier than

9

scheduled, forcing the Fund to reinvest in lower yielding securities. This is known as call or prepayment risk. Debt securities frequently have call features that allow the issuer to repurchase the security prior to its stated maturity. An issuer may redeem an obligation if the issuer can refinance the debt at a lower cost due to declining interest rates or an improvement in the credit standing of the issuer.

- During periods of rising interest rates, the average life of certain types of securities may be extended because of slower than expected principal payments. This may lock in a below market interest rate, increase the security's duration (the estimated period until the security is paid in full) and reduce the value of the security. This is known as extension risk.

- Market interest rates currently are at historically low levels. See "Risk Factors -- Interest Rate Risks."

Default Risk. Default risk refers to the risk that a company that issues a debt security will be unable to fulfill its obligations to repay principal and interest. The lower a debt security is rated, the greater the default risk.

Rule 144A Securities. The Fund may invest without limit in securities that have not been registered for public sale, but that are eligible for purchase and sale by certain qualified institutional buyers ("Rule 144A Securities"). See "The Fund's Investments -- Principal Investment Strategies -- Rule 144A Securities."

Convertible Securities. Convertible securities generally offer lower interest or dividend yields than non-convertible securities of similar quality. The market values of convertible securities tend to decline as interest rates increase and, conversely, to increase as interest rates decline. However, the convertible's market value tends to reflect the market price of the common stock of the issuing company when that stock price is greater than the convertible's "conversion price." The conversion price is defined as the predetermined price at which the convertible could be exchanged for the associated stock. As the market price of the underlying common stock declines, the price of the convertible security tends to be influenced more by the yield of the convertible security. Thus, it may not decline in price to the same extent as the underlying common stock. In the event of a liquidation of the issuing company, holders of convertible securities would be paid before the company's common stockholders. Consequently, the issuer's convertible securities generally entail less risk than its common stock. See "Risk Factors -- Convertible Securities."

Synthetic Convertible Securities. The value of a synthetic convertible security may respond differently to market fluctuations than a convertible security because a synthetic convertible is composed of two or more separate securities, each with its own market value. In addition, if the value of the underlying common stock or the level of the index involved in

10

the convertible component falls below the exercise price of the warrant or option, the warrant or option may lose all value. See "Risk Factors -- Synthetic Convertible Securities."

Leverage. The Fund may use leverage by issuing preferred shares, borrowing money or issuing debt securities. The Fund currently anticipates that it will issue cumulative preferred shares, as soon as practicable after the closing of this offering, with an aggregate liquidation preference of up to approximately 33% of the Fund's total assets immediately after issuance. As a non-fundamental policy, such preferred shares or borrowing may not exceed 38% of the Fund's total assets. The Fund may not be leveraged at all times and the amount of borrowing or leverage, if any, may vary depending upon a variety of factors, including Calamos' outlook for the market and the costs that the Fund would incur as a result of such leverage. Leverage creates risks which may adversely affect the return for the holders of common shares, including:

- the likelihood of greater volatility of net asset value and market price of the Fund's common shares;

- fluctuations in the dividend rates on any preferred shares or in interest rates on borrowings and short-term debt;

- increased operating costs, which are effectively borne by common shareholders, may reduce the Fund's total return; and

- the potential for a decline in the value of an investment acquired with borrowed funds, while the Fund's obligations under such borrowing remain fixed.

To the extent the income or capital appreciation derived from securities purchased with funds received from leverage exceeds the cost of leverage, the Fund's return will be greater than if leverage had not been used. Conversely, if the income or capital appreciation from the securities purchased with such funds is not sufficient to cover the cost of leverage or if the Fund incurs capital losses, the return of the Fund will be less than if leverage had not been used, and therefore the amount available for distribution to common shareholders as dividends and other distributions will be reduced or potentially eliminated. Common shareholders bear the costs of any leverage.

Certain types of borrowings may result in the Fund being subject to covenants in credit agreements, including those relating to asset coverage, borrowing base and portfolio composition requirements and additional covenants that may affect the Fund's ability to pay dividends and distributions on common shares in certain instances and may affect the Fund's implementation of its investment strategy. The Fund may also be required to pledge its assets to the lenders in connection with certain types of borrowings. The Fund may be subject to certain restrictions on investments imposed by guidelines of one or more nationally recognized rating organizations which may issue ratings for the preferred shares or short-term debt instruments issued by the Fund. These guidelines

11

may impose asset coverage or portfolio composition requirements that are more stringent than those imposed by the 1940 Act.

See "Risk Factors -- Leverage."

Interest Rate Transactions Risk. The Fund may
enter into an interest rate swap or cap
transaction to attempt to protect itself from
increasing dividend or interest expenses on its
leverage resulting from increasing short-term
interest rates. A decline in interest rates may
result in a decline in the value of the swap or
cap, which may result in a decline in the net
asset value of the Fund. See "Risk
Factors -- Interest Rate Transactions Risk."

Tax Risk. The Fund may invest in certain
securities, such as certain convertible
securities, for which the federal income tax
treatment may not be clear or may be subject to
recharacterization by the Internal Revenue
Service. It could be more difficult for the
Fund to comply with the tax requirements
applicable to regulated investment companies if
the tax characterization of the Fund's
investments or the tax treatment of the income
from such investments were successfully
challenged by the Internal Revenue Service. See
"U.S. Federal Income Tax Matters."

Management Risk. Calamos' judgment about the attractiveness, relative value or potential appreciation of a particular sector, security or investment strategy may prove to be incorrect. See "Risk Factors -- Management Risk."

Antitakeover Provisions. The Fund's Agreement and Declaration of Trust and By-laws include provisions that could limit the ability of other entities or persons to acquire control of the Fund or to change the composition of its Board of Trustees. Such provisions could limit the ability of shareholders to sell their shares at a premium over prevailing market prices by discouraging a third party from seeking to obtain control of the Fund. These provisions include staggered terms of office for the Trustees, advance notice requirements for shareholder proposals, and super-majority voting requirements for certain transactions with affiliates, converting the Fund to an open-end investment company or a merger, asset sale or similar transaction. Holders of preferred shares will have voting rights in addition to and separate from the voting rights of common shareholders with respect to certain of these matters. See "Description of Shares -- Preferred Shares" and "Certain Provisions of the Agreement and Declaration of Trust and By-Laws." The holders of preferred shares, on the one hand, and the holders of the common shares, on the other, may have interests that conflict in these situations. See "Risk Factors -- Antitakeover Provisions."

Market Disruption Risk. Certain events have a disruptive effect on the securities markets, such as terrorist attacks (including the terrorist attacks in the United States on September 11, 2001), war and other geopolitical events, earthquakes, storms and other disasters. The Fund cannot predict the effects of similar events in the future on the markets or economy of the U.S. or other countries.

12

SUMMARY OF FUND EXPENSES

The following table shows the Fund's expenses as a percentage of net assets attributable to common shares assuming the Fund issues preferred shares in an amount equal to 33% of the Fund's total assets immediately after issuance.

SHAREHOLDER TRANSACTION EXPENSES:

Sales Load (as a percentage of offering price)..............            %
Offering Expenses of the Common Shares borne by the Fund (as
  a percentage of offering price)(1)........................            %
Offering Expenses of the Preferred Shares expected to be
  borne by the Fund (as a percentage of offering
  price)(2).................................................            %
Dividend Reinvestment Plan Fees.............................        None(3)

                                                               PERCENTAGE OF
                                                                 NET ASSETS
                                                              ATTRIBUTABLE TO
                                                               COMMON SHARES
                                                                  (ASSUMES
                                                              PREFERRED SHARES
                                                               ARE ISSUED)(4)
                                                              ----------------
ANNUAL EXPENSES
     Management Fee.........................................            %
     Other Expenses.........................................            %
     Interest Payments on Borrowed Funds(5).................        None
                                                                    ----
     Total Annual Expenses..................................            %


(1) Calamos has agreed to pay organizational expenses and offering costs (other than sales load, but including reimbursement of underwriter expenses of $ per share) that exceed $.03 per common share ( % of the offering price).

(2) If the Fund offers preferred shares, costs of that offering, estimated to be approximately % of the total amount of the preferred share offering, will effectively be borne by the common shareholders and will result in a reduction of the net asset value of the common shares. Assuming the issuance of preferred shares in the amount equal to 33% of the Fund's total assets immediately after issuance, those offering costs are estimated to be approximately $ per common share ( % of the offering price of the common shares).

(3) A shareholder that directs the plan agent to sell shares held in a dividend reinvestment account will pay brokerage charges.

(4) If the Fund does not issue preferred shares, or otherwise use leverage, the Fund's expenses would be as set out in the table below:

                                                               PERCENTAGE OF
                                                                 NET ASSETS
                                                              ATTRIBUTABLE TO
                                                               COMMON SHARES
                                                                (ASSUMES NO
                                                               BORROWINGS AND
                                                                NO PREFERRED
                                                                 SHARES ARE
                                                                OUTSTANDING)
                                                              ----------------
ANNUAL EXPENSES
     Management Fee.........................................            %
     Other Expenses.........................................            %
     Interest Payments on Borrowed Funds(5).................        None
     Total Annual Expenses..................................            %

(5) In the event the Fund, as an alternative to issuing preferred shares, utilizes leverage through borrowings in an amount equal to 33% of the Fund's total assets (including the amount obtained from

13

leverage), it is estimated that, as a percentage of net assets attributable to common shares, the "Management Fee" would be %, "Other Expenses" would be %, "Interest Payments on Borrowed Funds" (assuming an interest rate of %, which interest rate is subject to change based on prevailing market conditions) would be % and "Total Annual Expenses" would be %. Based on the "Total Annual Expenses" and in accordance with the example below, the expenses for years 1, 3, 5 and 10 would be $ , $ , $ and $ , respectively.

The purpose of the table above is to help you understand all fees and expenses that you, as a common shareholder, would bear directly or indirectly. As of the date of this prospectus, the Fund has not commenced investment operations. The amount set forth under "Other Expenses" is based upon estimates for the current year, assuming no exercise of the overallotment option granted to the underwriters. The table assumes that the Fund issues common shares and issues preferred shares as a means of leverage. If the Fund issues fewer common shares, all other things being equal, these expenses, as a percentage of net assets, would increase. If the Fund leverages through borrowing, the Fund would incur interest expense. For additional information with respect to the Fund's expenses, see "Management of the Fund." Other expenses include custodial and transfer agency fees, legal and accounting expenses, and listing fees.

The following example illustrates the expenses (including the sales load of $ , estimated offering and organizational expenses of this offering of $ and the estimated preferred share offering costs of $ , assuming preferred shares are issued representing 33% of the Fund's total assets) that you would pay on a $1,000 investment in common shares, assuming (1) net annual expenses of % of net assets attributable to common shares, (2) a 5% annual return and (3) the Fund issues preferred shares in an amount equal to 33% of the Fund's total assets:(*)

                                                      1 YEAR    3 YEARS    5 YEARS    10 YEARS
                                                     --------   --------   --------   --------
Total Expenses Incurred............................  $          $          $          $


(*) THE EXAMPLE SHOULD NOT BE CONSIDERED A REPRESENTATION OF FUTURE EXPENSES.
ACTUAL EXPENSES MAY BE GREATER OR LESS THAN THOSE ASSUMED. The example assumes that the estimated "Other Expenses" set forth in the fee table are accurate and that all dividends and distributions are reinvested at net asset value. Moreover, the Fund's actual rate of return may be greater or less than the hypothetical 5% return shown in the example. The expenses you would pay, based on the Fund's expenses stated as a percentage of the Fund's net assets assuming the Fund does not issue preferred shares, or otherwise use leverage, and otherwise making the same assumptions in the example above, would be: 1 year, $ ; 3 years, $ ; 5 years, $ ; and 10 years, $ .

THE FUND

Calamos Global Total Return Fund is a newly organized, diversified, closed-end management investment company. The Fund was organized under the laws of the state of Delaware on , 2004, and has registered under the 1940 Act. As a recently organized entity, the Fund has no operating history. The Fund's principal office is located at 1111 East Warrenville Road, Naperville, Illinois 60563-1493, and its telephone number is 1-800-582-6959.

USE OF PROCEEDS

The net proceeds of this offering will be approximately $ (or approximately $ assuming the underwriters exercise the overallotment option in full) after payment of organizational and offering costs estimated to be approximately $ and the deduction of the sales load. Calamos has agreed to pay organizational expenses and offering costs (other than sales load, but including reimbursement of underwriter expenses of $ per share) that exceed $ per share.

The Fund will invest the net proceeds of the offering in accordance with the Fund's investment objective and policies as stated below. It is presently anticipated that the Fund will invest substantially all

14

of the net proceeds in securities that meet the investment objective and policies within three months after completion of this offering. Pending such investment, the Fund anticipates that all or a portion of the proceeds will be invested in U.S. government securities or high grade, short-term money market instruments. If necessary, the Fund may also purchase, as temporary investments, securities of other open-or closed-end investment companies that invest primarily in the types of securities in which the Fund may invest directly. See "Investment Objective and Principal Investment Strategies."

INVESTMENT OBJECTIVE AND PRINCIPAL INVESTMENT STRATEGIES

INVESTMENT OBJECTIVE

The Fund's investment objective is to provide total return through a combination of capital appreciation and current income. The Fund's investment objective may be changed by its Board of Trustees without a shareholder vote, except that the Fund will give shareholders at least 60 days' notice of any change to the Fund's investment objective. The Fund makes no assurance that it will realize its objective. An investment in the Fund may be speculative in that it involves a high degree of risk and should not constitute a complete investment program. See "Risk Factors."

PRINCIPAL INVESTMENT STRATEGIES

Under normal circumstances, the Fund will invest primarily in a portfolio of equity securities and other income producing securities such as investment grade and below investment grade (high yield/high risk) debt securities. The Fund, under normal circumstances, will invest at least 50% of its managed assets in equity securities (including securities that are convertible into equity securities). The Fund may invest up to 100% of its managed assets in securities of foreign issuers, including debt and equity securities of corporate issuers and debt securities of government issuers, in developed and emerging markets. However, the Fund will invest in securities of at least three countries, which may include the United States.

The Fund will attempt to keep a consistent balance between risk and reward over the course of different market cycles, through various combinations of stocks, bonds, and/or convertible securities, to achieve what the investment adviser believes to be an appropriate blend for the then current market. As the market environment changes, portfolio securities may change in an attempt to achieve a relatively consistent risk level over time. At some points in a market cycle, one type of security may make up a substantial portion of the portion of the portfolio, while at other times certain securities may have minimal or no representation, depending on market conditions.

Equity Securities. Equity securities include common and preferred stocks, warrants, rights, and depository receipts. Under normal circumstances, the Fund will invest at least 50% of its managed assets in equity securities (including securities that are convertible into equity securities). An investment in the equity securities of a company represents a proportionate ownership interest in that company. Therefore, the Fund participates in the financial success or failure of any company in which it has an equity interest.

High Yield Securities. The Fund may invest in high yield securities for either current income or capital appreciation or both. The high yield securities in which the Fund invests are rated below investment grade (i.e., rated Ba or lower by Moody's or BB or lower by Standard & Poor's) or are unrated but determined by Calamos to be of comparable quality. The Fund may invest in high yield securities of any rating. Non-convertible debt securities rated below investment grade are commonly referred to as "junk bonds" and are considered speculative with respect to the issuer's capacity to pay interest and repay principal. Below investment grade non-convertible debt securities involve greater risk of loss, are subject to greater price volatility and are less liquid, especially during periods of economic uncertainty or change, than higher rated debt securities.

Other Income Securities. The Fund may also invest in investment grade income securities. The Fund's investments in investment grade income securities may have fixed or variable principal payments

15

and all types of interest rate and dividend payment and reset terms, including fixed rate, adjustable rate, zero coupon, contingent, deferred, payment in kind and auction rate features.

Foreign Securities. The Fund may invest up to 100% of its managed assets in securities of foreign issuers, including debt and equity securities of corporate issuers and debt securities of government issuers, in developed and emerging markets. The Fund will invest in the securities markets of at least three markets, which may include the United States. A foreign issuer is a company organized under the laws of a foreign country that is principally traded in the financial markets of a foreign country. For these purposes, foreign securities do not include securities represented by American Depository Receipts ("ADRs") or securities guaranteed by a U.S. person.

Convertible Securities. A convertible security is a debt security or preferred stock that is exchangeable for an equity security (typically of the same issuer) at a predetermined price. Depending upon the relationship of the conversion price to the market value of the underlying security, a convertible security may trade more like an equity security than a debt instrument. The Fund may invest in convertible securities of any rating. Securities that are convertible into equity securities are considered equity securities for purposes of the Fund's policy to invest at least 50% of its managed assets in equity securities.

Synthetic Convertible Securities. Calamos may also create a "synthetic" convertible security by combining separate securities that possess the two principal characteristics of a true convertible security, i.e., a fixed-income security ("fixed-income component") and the right to acquire an equity security ("convertible component"). The fixed-income component is achieved by investing in non-convertible, fixed-income securities such as bonds, preferred stocks and money market instruments. The convertible component is achieved by investing in warrants or options to buy common stock at a certain exercise price, or options on a stock index. The Fund may also purchase synthetic securities created by other parties, typically investment banks, including convertible structured notes. Convertible structured notes are fixed income debentures linked to equity. Convertible structured notes have the attributes of a convertible security, however, the investment bank that issued the convertible note assumes the credit risk associated with the investment, rather than the issuer of the underlying common stock into which the note is convertible. Different companies may issue the fixed-income and convertible components, which may be purchased separately and at different times. The Fund's holdings of synthetic convertible securities are considered equity securities for purposes of the Fund's policy to invest at least 50% of its managed assets in equity securities.

Rule 144A Securities. The Fund may invest without limit in securities that have not been registered for public sale, but that are eligible for purchase and sale by certain qualified institutional buyers ("Rule 144A Securities").

U.S. Government Securities. U.S. government securities in which the Fund invests include debt obligations of varying maturities issued by the U.S. Treasury or issued or guaranteed by an agency or instrumentality of the U.S. government, including the Federal Housing Administration, Federal Financing Bank, Farmers Home Administration, Export-Import Bank of the United States, Small Business Administration, Government National Mortgage Association, General Services Administration, Central Bank for Cooperatives, Federal Farm Credit Banks, Federal Home Loan Banks, Federal Home Loan Mortgage Corporation, Federal National Mortgage Association ("FNMA"), Maritime Administration, Tennessee Valley Authority, District of Columbia Armory Board, Student Loan Marketing Association, Resolution Fund Corporation and various institutions that previously were or currently are part of the Farm Credit System (which has been undergoing reorganization since 1987). Some U.S. government securities, such as U.S. Treasury bills, Treasury notes and Treasury bonds, which differ only in their interest rates, maturities and times of issuance, are supported by the full faith and credit of the United States. Others are supported by: (i) the right of the issuer to borrow from the U.S. Treasury, such as securities of the Federal Home Loan Banks; (ii) the discretionary authority of the U.S. government to purchase the agency's obligations, such as securities of the FNMA; or (iii) only the credit of the issuer. No assurance can be given that the U.S. government will provide financial support in the future to

16

U.S. government agencies, authorities or instrumentalities that are not supported by the full faith and credit of the United States. Securities guaranteed as to principal and interest by the U.S. government, its agencies, authorities or instrumentalities include: (i) securities for which the payment of principal and interest is backed by an irrevocable letter of credit issued by the U.S. government or any of its agencies, authorities or instrumentalities; and (ii) participations in loans made to non-U.S. governments or other entities that are so guaranteed. The secondary market for certain of these participations is limited and, therefore, may be regarded as illiquid.

Zero Coupon Securities. The securities in which the Fund invests may include zero coupon securities, which are debt obligations that are issued or purchased at a significant discount from face value. The discount approximates the total amount of interest the security will accrue and compound over the period until maturity or the particular interest payment date at a rate of interest reflecting the market rate of the security at the time of issuance. Zero coupon securities do not require the periodic payment of interest. These investments benefit the issuer by mitigating its need for cash to meet debt service, but generally require a higher rate of return to attract investors who are willing to defer receipt of cash. These investments may experience greater volatility in market value than U.S. government or other securities that make regular payments of interest. The Fund accrues income on these investments for tax and accounting purposes, which is distributable to shareholders and which, because no cash is received at the time of accrual, may require the liquidation of other portfolio securities to satisfy the Fund's distribution obligations, in which case the Fund will forgo the opportunity to purchase additional income producing assets with the liquidation proceeds. Zero coupon U.S. government securities include STRIPS and CUBES, which are issued by the U.S. Treasury as component parts of U.S. Treasury bonds and represent scheduled interest and principal payments on the bonds.

Other Investment Companies. The Fund may invest in the securities of other investment companies to the extent that such investments are consistent with the Fund's investment objective and policies and are permissible under the 1940 Act. Under the 1940 Act, the Fund may not acquire the securities of other domestic or non-U.S. investment companies if, as a result, (1) more than 10% of the Fund's total assets would be invested in securities of other investment companies, (2) such purchase would result in more than 3% of the total outstanding voting securities of any one investment company being held by the Fund, or (3) more than 5% of the Fund's total assets would be invested in any one investment company. These limitations do not apply to the purchase of shares of any investment company in connection with a merger, consolidation, reorganization or acquisition of substantially all the assets of another investment company.

The Fund, as a holder of the securities of other investment companies, will bear its pro rata portion of the other investment companies' expenses, including advisory fees. These expenses are in addition to the direct expenses of the Fund's own operations.

Temporary Defensive Investments. Under unusual market or economic conditions or for temporary defensive purposes, the Fund may invest up to 100% of its total assets in securities issued or guaranteed by the U.S. government or its instrumentalities or agencies, certificates of deposit, bankers' acceptances and other bank obligations, commercial paper rated in the highest category by a nationally recognized statistical rating organization or other fixed income securities deemed by Calamos to be consistent with a defensive posture, or may hold cash. The yield on such securities may be lower than the yield on lower rated fixed income securities. During such periods, the Fund may not be able to achieve its investment objective.

Repurchase Agreements. The Fund may enter into repurchase agreements with broker-dealers, member banks of the Federal Reserve System and other financial institutions. Repurchase agreements are arrangements under which the Fund purchases securities and the seller agrees to repurchase the securities within a specific time and at a specific price. The repurchase price is generally higher than the Fund's purchase price, with the difference being income to the Fund. The counterparty's obligations under the repurchase agreement are collateralized with U.S. Treasury and/or agency obligations with a market value of not less than 100% of the obligations, valued daily. Collateral is held by the Fund's custodian in a segregated, safekeeping account for the benefit of the Fund. Repurchase agreements afford the Fund an

17

opportunity to earn income on temporarily available cash at low risk. In the event of commencement of bankruptcy or insolvency proceedings with respect to the seller of the security before repurchase of the security under a repurchase agreement, the Fund may encounter delay and incur costs before being able to sell the security. Such a delay may involve loss of interest or a decline in price of the security. If a court characterizes a repurchase transaction as a loan and the Fund has not perfected a security interest in the security, the Fund may be required to return the security to the seller's estate and be treated as an unsecured creditor of the seller. As an unsecured creditor, the Fund would be at risk of losing some or all of the principal and interest involved in the transaction.

Lending Of Portfolio Securities. The Fund may lend portfolio securities to registered broker-dealers or other institutional investors deemed by Calamos to be of good standing under agreements which require that the loans be secured continuously by collateral in cash, cash equivalents or U.S. Treasury bills maintained on a current basis at an amount at least equal to the market value of the securities loaned. The Fund continues to receive the equivalent of the interest or dividends paid by the issuer on the securities loaned as well as the benefit of an increase and the detriment of any decrease in the market value of the securities loaned and would also receive compensation based on investment of the collateral. The Fund would not, however, have the right to vote any securities having voting rights during the existence of the loan, but could call the loan in anticipation of an important vote to be taken among holders of the securities or of the giving or withholding of consent on a material matter affecting the investment.

As with other extensions of credit, there are risks of delay in recovery or even loss of rights in the collateral should the borrower of the securities fail financially. At no time would the value of the securities loaned exceed 33 1/3% of the value of the Fund's total assets.

Portfolio Turnover. Although the Fund does not purchase securities with a view to rapid turnover, there are no limitations on the length of time that portfolio securities must be held. Portfolio turnover can occur for a number of reasons, including calls for redemption, general conditions in the securities markets, more favorable investment opportunities in other securities, or other factors relating to the desirability of holding or changing a portfolio investment. The portfolio turnover rates may vary greatly from year to year. A high rate of portfolio turnover in the Fund would result in increased transaction expense, which must be borne by the Fund. High portfolio turnover may also result in the realization of capital gains or losses and, to the extent net short-term capital gains are realized, any distributions resulting from such gains will be considered ordinary income for federal income tax purposes.

LEVERAGE

The Fund may issue preferred shares or borrow money or issue short-term debt securities to increase its assets available for investment. The Fund currently anticipates that it will issue, as soon as practicable after the closing of this offering, cumulative preferred shares with an aggregate liquidation preference of up to approximately 33% of the Fund's total assets immediately after issuance. It is anticipated that the preferred shares will have a liquidation preference of $25,000 per share plus an amount equal to accumulated but unpaid dividends. As a non-fundamental policy, such preferred shares or borrowing may not exceed 38% of the Fund's total assets. However, the Board of Trustees reserves the right to issue preferred shares or borrow to the extent permitted by the 1940 Act. The Fund generally will not issue preferred shares or borrow unless Calamos expects that the Fund will achieve a greater return on such borrowed funds than the additional costs the Fund incurs as a result of such borrowing. The Fund also may borrow money as a temporary measure for extraordinary or emergency purposes, including the payment of dividends and the settlement of securities transactions which otherwise might require untimely dispositions of the Fund's holdings. When the Fund leverages its assets, the fees paid to Calamos for investment management services will be higher than if the Fund did not borrow because Calamos' fees are calculated based on the Fund's managed assets, which include the proceeds of the issuance of preferred shares or any outstanding borrowings. Consequently, the Fund and Calamos may have differing interests in determining whether to leverage the Fund's assets.

18

The Fund's use of leverage is premised upon the expectation that the Fund's preferred share dividends or borrowing cost will be lower than the return the Fund achieves on its investments with the proceeds of the issuance of preferred shares or borrowing. Such difference in return may result from the Fund's higher credit rating or the short-term nature of its borrowing compared to the long-term nature of its investments. Since the total assets of the Fund (including the assets obtained from leverage) will be invested in the higher yielding portfolio investments or portfolio investments with the potential for capital appreciation, the holders of common shares will be the beneficiaries of the incremental return. Should the differential between the underlying assets and cost of leverage narrow, the incremental return "pick up" will be reduced. Furthermore, if long-term interest rates rise or the Fund otherwise incurs losses on its investments, the Fund's net asset value attributable to its common shares will reflect the decline in the value of portfolio holdings resulting therefrom.

Leverage creates risks which may adversely affect the return for the holders of common shares, including:

- the likelihood of greater volatility of net asset value and market price of common shares;

- fluctuations in the dividend rates on any preferred shares or in interest rates on borrowings and short-term debt;

- increased operating costs, which may reduce the Fund's total return; and

- the potential for a decline in the value of an investment acquired with borrowed funds, while the Fund's obligations under such borrowing remains fixed.

To the extent the income or capital appreciation derived from securities purchased with funds received from leverage exceeds the cost of leverage, the Fund's return will be greater than if leverage had not been used. Conversely, if the income or capital appreciation from the securities purchased with such funds is not sufficient to cover the cost of leverage or if the Fund incurs capital losses, the return of the Fund will be less than if leverage had not been used, and therefore the amount available for distribution to common shareholders as dividends and other distributions will be reduced or potentially eliminated. Calamos may determine to maintain the Fund's leveraged position if it expects that the long-term benefits to the Fund's common shareholders of maintaining the leveraged position will outweigh the current reduced return. Capital raised through the issuance of preferred shares or borrowing will be subject to dividend payments or interest costs that may or may not exceed the income and appreciation on the assets purchased. The issuance of additional classes of preferred shares involves offering expenses and other costs and may limit the Fund's freedom to pay dividends on common shares or to engage in other activities. The Fund also may be required to maintain minimum average balances in connection with borrowings or to pay a commitment or other fee to maintain a line of credit. Either of these requirements would increase the cost of borrowing over the stated interest rate. The Fund will pay (and common shareholders will bear) any costs and expenses relating to any borrowings and to the issuance and ongoing maintenance of preferred shares (for example the participation fee paid at what it expects will be an annual rate of .25% of preferred share liquidation preference to broker-dealers successfully participating in preferred share auctions). Net asset value will be reduced immediately following any offering of preferred shares by the costs of that offering paid by the Fund.

Under the 1940 Act, the Fund is not permitted to issue preferred shares unless immediately after such issuance the net asset value of the Fund's portfolio is at least 200% of the liquidation value of the outstanding preferred shares (i.e., such liquidation value may not exceed 50% of the value of the Fund's total assets). In addition, the Fund is not permitted to declare any cash dividend or other distribution on its common shares unless, at the time of such declaration, the net asset value of the Fund's portfolio (determined after deducting the amount of such dividend or distribution) is at least 200% of such liquidation value. In the event preferred shares are issued, the Fund intends, to the extent possible, to purchase or redeem preferred shares from time to time to maintain coverage of any preferred shares of at least 200%. Under the 1940 Act, the Fund is not permitted to incur indebtedness unless immediately after such borrowing the Fund has an asset coverage of at least 300% of the aggregate outstanding principal

19

balance of indebtedness (i.e., such indebtedness may not exceed 33 1/3% of the value of the Fund's total assets). Additionally, under the 1940 Act, the Fund may not declare any dividend or other distribution upon any class of its shares, or purchase any such shares, unless the aggregate indebtedness of the Fund has, at the time of the declaration of any such dividend or distribution or at the time of any such purchase, an asset coverage of at least 300% after deducting the amount of such dividend, distribution, or purchase price, as the case may be.

The Fund may be subject to certain restrictions on investments imposed by guidelines of one or more nationally recognized statistical rating organizations which may issue ratings for the preferred shares or short-term debt instruments issued by the Fund. These guidelines may impose asset coverage or portfolio composition requirements that are more stringent than those imposed by the 1940 Act. Certain types of borrowings may result in the Fund being subject to covenants in credit agreements, including those relating to asset coverage, borrowing base and portfolio composition requirements and additional covenants that may affect the Fund's ability to pay dividends and distributions on common shares in certain instances. The Fund may also be required to pledge its assets to the lenders in connection with certain types of borrowings. Calamos does not anticipate that these covenants or restrictions will adversely affect its ability to manage the Fund's portfolio in accordance with the Fund's investment objective and policies. Due to these covenants or restrictions, the Fund may be forced to liquidate investments at times and at prices that are not favorable to the Fund, or the Fund may be forced to forgo investments that Calamos otherwise views as favorable.

If and the extent to which the Fund employs leverage will depend on many factors, the most important of which are investment outlook, market conditions and interest rates. Successful use of a leveraging strategy depends on Calamos' ability to predict correctly interest rates and market movements. There is no assurance that a leveraging strategy will be successful during any period in which it is employed.

EFFECTS OF LEVERAGE

Assuming the Fund issues preferred shares with a liquidation preference equal to approximately 33% of the Fund's total assets and an annual dividend rate of % of such liquidation preference (which rate is approximately the current rate which Calamos expects the Fund to pay, based on market rates as of , 2004), income generated by the Fund's portfolio (net of estimated expenses) would need to exceed % in order to cover such dividend payments on the preferred shares. Actual dividend rates may vary and may be significantly higher or lower than the rate estimated above.

The following table illustrates the hypothetical effect on the return to a holder of the Fund's common shares of the leverage obtained by issuing preferred shares with a liquidation value equal to 33% of the Fund's total assets, assuming hypothetical annual returns of the Fund's portfolio of minus 10% to plus 10% and dividends on preferred shares at an annual dividend rate of %. As the table shows, leverage generally increases the return to common shareholders when portfolio return is positive and greater than the cost of leverage and decreases the return when the portfolio return is negative or less than the cost of leverage. The figures appearing in the table are hypothetical and actual returns may be greater or less than those appearing in the table.

Assumed Portfolio Return (Net of Expenses).......    (10)%      (5)%        0%   5%    10%
Corresponding Common Share Return................  (     )%  (     )%  (     )%   %      %

Until the Fund issues preferred shares or borrows, the Fund's common shares will not be leveraged, and the risks and special considerations related to leverage described in this prospectus will not apply. Such leveraging of the common shares cannot be fully achieved until the proceeds resulting from the use of leverage have been invested in longer term debt instruments or equity securities in accordance with the Fund's investment objective and policies.

20

INTEREST RATE TRANSACTIONS

In order to seek to reduce the interest rate risk inherent in the Fund's underlying investments and capital structure, the Fund, if market conditions are deemed favorable, likely will enter into interest rate swap or cap transactions to attempt to protect itself from increasing dividend or interest expenses on its leverage. Interest rate swaps involve the Fund's agreement with the swap counterparty to pay a fixed rate payment in exchange for the counterparty agreeing to pay the Fund a payment at a variable rate that is expected to approximate the rate of any variable rate payment obligation on the Fund's leverage. The payment obligations would be based on the notional amount of the swap.

The Fund may use an interest rate cap, which would require it to pay a premium to the cap counterparty and would entitle it, to the extent that a specified variable rate index exceeds a predetermined fixed rate, to receive from the counterparty payment of the difference based on the notional amount of such cap. The Fund would use interest rate swaps or caps only with the intent to reduce or eliminate the risk that an increase in short-term interest rates could have on common share net earnings as a result of leverage.

The Fund will usually enter into swaps or caps on a net basis; that is, the two payment streams will be netted out in a cash settlement on the payment date or dates specified in the instrument, with the Fund receiving or paying, as the case may be, only the net amount of the two payments. The Fund intends to maintain in a segregated account with its custodian cash or liquid securities having a value at least equal to the Fund's net payment obligations under any swap transaction, marked-to-market daily.

The use of interest rate swaps and caps is a highly specialized activity that involves investment techniques and risks different from those associated with ordinary portfolio security transactions. Depending on the state of interest rates in general, the Fund's use of interest rate swaps or caps could enhance or harm the overall performance of the common shares. To the extent that there is a decline in interest rates for maturities equal to the remaining maturity on the Fund's fixed rate payment obligation under the interest rate swap or equal to the remaining term of the interest rate cap, the value of the swap or cap (which initially has a value of zero) could decline, and could result in a decline in the net asset value of the common shares. If, on the other hand, such rates were to increase, the value of the swap or cap could increase, and thereby increase the net asset value of the common shares. As interest rate swaps or caps approach their maturity, their positive or negative value due to interest rate changes will approach zero.

In addition, if the short-term interest rates effectively received by the Fund during the term of an interest rate swap are lower than the Fund's fixed rate of payment on the swap, the swap will increase the Fund's operating expenses and reduce common share net earnings. For example, if the Fund were to
(A) issue preferred shares representing 33% of the Fund's total assets and (B)
enter into one or more interest rate swaps in a notional amount equal to 75% of its outstanding preferred shares under which the Fund would receive a short-term swap rate that would vary based on changes in short-term interest rates, with an initial short-term rate of 1.50% and pay a fixed swap rate of 3.50% over the term of the swap, the swap would initially effectively increase Fund expenses and reduce Fund common share net earnings at an annual rate of approximately .75% as a percentage of net assets attributable to common shares and approximately .50% as a percentage of managed assets. If, on the other hand, later during the term of the swap the short-term interest rates rise so that the short-term rate effectively received by the Fund on the swap is higher than the Fund's fixed rate of payment on the interest rate swap, the swap would enhance common share net earnings. In either case, the swap would be intended to have the effect of reducing fluctuations in the Fund's cost of leverage due to changes in short-term interest rates during the term of the swap. The example above is purely for illustrative purposes and is not predictive of the actual percentage of the Fund's leverage that will be hedged by a swap, the actual fixed rates that the Fund will pay under the swap (which will depend on market interest rates for the applicable maturities at the time the Fund enters into swaps) or the actual short-term rates that the Fund will receive on any swaps (which fluctuate frequently during the term of the swap, and may change significantly from initial levels), or the actual impact such swaps will have on the Fund's expenses and common share net earnings.

21

Buying interest rate caps could enhance the performance of the common shares by providing a maximum leverage expense. Buying interest rate caps could also increase the operating expenses of the Fund and decrease the net earnings of the common shares in the event that the premium paid by the Fund to the counterparty exceeds the additional amount the Fund would have been required to pay on its preferred shares due to increases in short-term interest rates during the term of the cap had it not entered into the cap agreement. The Fund has no current intention of selling an interest rate cap.

Interest rate swaps and caps do not involve the delivery of securities or other underlying assets or principal. Accordingly, the risk of loss with respect to interest rate swaps is limited to the net amount of interest payments that the Fund is contractually obligated to make. If the counterparty defaults, the Fund would not be able to use the anticipated net receipts under the swap or cap to offset the dividend or interest payments on the Fund's leverage. Depending on whether the Fund would be entitled to receive net payments from the counterparty on the swap or cap, which in turn would depend on the general state of short-term interest rates at that point in time, such a default could negatively impact the performance of the common shares.

Although this will not guarantee that the counterparty does not default, the Fund will not enter into an interest rate swap or cap transaction with any counterparty that Calamos believes does not have the financial resources to honor its obligation under the interest rate swap or cap transaction. Further, Calamos will continually monitor the financial stability of a counterparty to an interest rate swap or cap transaction in an effort to proactively protect the Fund's investments.

In addition, at the time the interest rate swap or cap transaction reaches its scheduled termination date, there is a risk that the Fund will not be able to obtain a replacement transaction or that the terms of the replacement will not be as favorable as on the expiring transaction. If this occurs, it could have a negative impact on the performance of the common shares.

The Fund may choose or be required to redeem some or all preferred shares or prepay any borrowings. This redemption would likely result in the Fund seeking to terminate early all or a portion of any swap or cap transaction. Such early termination of a swap could result in a termination payment by or to the Fund. An early termination of a cap could result in a termination payment to the Fund.

22

RISK FACTORS

General. The Fund is a newly organized, diversified, closed-end management investment company designed primarily as a long-term investment and not as a trading tool. The Fund invests in a diversified portfolio of common and preferred stocks and income producing securities such as investment grade and below investment grade debt securities. An investment in the Fund's common shares may be speculative and it involves a high degree of risk. The Fund should not constitute a complete investment program. Due to the uncertainty in all investments, there can be no assurance that the Fund will achieve its investment objective.

No Operating History. The Fund has no operating history or history of public trading.

Market Price of Shares. Shares of closed-end funds frequently trade at a market price that is below their net asset value. This is commonly referred to as "trading at a discount." This characteristic of shares of closed-end funds is a risk separate and distinct from the risk that the Fund's net asset value may decrease. Investors who sell their shares within a relatively short period after completion of the public offering are likely to be exposed to this risk. Accordingly, the Fund is designed primarily for long-term investors and should not be considered a vehicle for trading purposes. Net asset value will be reduced following the offering by the sales load and the amount of organizational and offering expenses paid by the Fund and immediately following any offering of preferred shares by the costs of that offering paid by the Fund.

Whether investors will realize a gain or loss upon the sale of the Fund's common shares will depend upon whether the market value of the shares at the time of sale is above or below the price the investor paid, taking into account transaction costs, for the shares and is not directly dependent upon the Fund's net asset value. Because the market value of the Fund's shares will be determined by factors such as the relative demand for and supply of the shares in the market, general market conditions and other factors beyond the control of the Fund, the Fund cannot predict whether its common shares will trade at, below or above net asset value, or below or above the initial offering price for the shares.

Equity Securities. Equity investments are subject to greater fluctuations in market value than other asset classes as a result of such factors as the issuer's business performance, investor perceptions, stock market trends and general economic conditions. Equity securities are subordinated to bonds and other debt instruments in a company's capital structure in terms of priority to corporate income and liquidation payments.

High Yield Securities. The Fund may invest in high yield securities of any rating. Investment in high yield securities involves substantial risk of loss. Below investment grade non-convertible debt securities or comparable unrated securities are commonly referred to as "junk bonds" and are considered predominantly speculative with respect to the issuer's ability to pay interest and principal and are susceptible to default or decline in market value due to adverse economic and business developments. The market values for high yield securities tend to be very volatile, and these securities are less liquid than investment grade debt securities. For these reasons, your investment in the Fund is subject to the following specific risks:

- increased price sensitivity to changing interest rates and to a deteriorating economic environment;

- greater risk of loss due to default or declining credit quality;

- adverse company specific events are more likely to render the issuer unable to make interest and/or principal payments; and

- if a negative perception of the high yield market develops, the price and liquidity of high yield securities may be depressed. This negative perception could last for a significant period of time.

Securities rated below investment grade are speculative with respect to the capacity to pay interest and repay principal in accordance with the terms of such securities. A rating of C from Moody's means that the issue so rated can be regarded as having extremely poor prospects of ever attaining any real investment standing. Standard & Poor's assigns a rating of C to issues that are currently highly vulnerable

23

to nonpayment, and the C rating may be used to cover a situation where a bankruptcy petition has been filed or similar action taken, but payments on the obligation are being continued (a C rating is also assigned to a preferred stock issue in arrears on dividends or sinking fund payments, but that is currently paying). See the statement of additional information for a description of Moody's and Standard & Poor's ratings.

Adverse changes in economic conditions are more likely to lead to a weakened capacity of a high yield issuer to make principal payments and interest payments than an investment grade issuer. The principal amount of high yield securities outstanding has proliferated in the past decade as an increasing number of issuers have used high yield securities for corporate financing. An economic downturn could severely affect the ability of highly leveraged issuers to service their debt obligations or to repay their obligations upon maturity. Similarly, downturns in profitability in specific industries could adversely affect the ability of high yield issuers in those industries to meet their obligations. The market values of lower quality debt securities tend to reflect individual developments of the issuer to a greater extent than do higher quality securities, which react primarily to fluctuations in the general level of interest rates. Factors having an adverse impact on the market value of lower quality securities may have an adverse effect on the Fund's net asset value and the market value of its common shares. In addition, the Fund may incur additional expenses to the extent it is required to seek recovery upon a default in payment of principal or interest on its portfolio holdings. In certain circumstances, the Fund may be required to foreclose on an issuer's assets and take possession of its property or operations. In such circumstances, the Fund would incur additional costs in disposing of such assets and potential liabilities from operating any business acquired.

The secondary market for high yield securities may not be as liquid as the secondary market for more highly rated securities, a factor which may have an adverse effect on the Fund's ability to dispose of a particular security. There are fewer dealers in the market for high yield securities than for investment grade obligations. The prices quoted by different dealers may vary significantly and the spread between the bid and asked price is generally much larger than for higher quality instruments. Under adverse market or economic conditions, the secondary market for high yield securities could contract further, independent of any specific adverse changes in the condition of a particular issuer, and these instruments may become illiquid. As a result, the Fund could find it more difficult to sell these securities or may be able to sell the securities only at prices lower than if such securities were widely traded. Prices realized upon the sale of such lower rated or unrated securities, under these circumstances, may be less than the prices used in calculating the Fund's net asset value.

Since investors generally perceive that there are greater risks associated with lower quality debt securities of the type in which the Fund may invest a portion of its assets, the yields and prices of such securities may tend to fluctuate more than those for higher rated securities. In the lower quality segments of the debt securities market, changes in perceptions of issuers' creditworthiness tend to occur more frequently and in a more pronounced manner than do changes in higher quality segments of the debt securities market, resulting in greater yield and price volatility.

If the Fund invests in high yield securities that are rated C or below, the Fund will incur significant risk in addition to the risks associated with investments in high yield securities and corporate loans. Distressed securities frequently do not produce income while they are outstanding. The Fund may purchase distressed securities that are in default or the issuers of which are in bankruptcy. The Fund may be required to bear certain extraordinary expenses in order to protect and recover its investment.

Foreign Securities. Investments in non-U.S. issuers may involve unique risks compared to investing in securities of U.S. issuers. These risks are more pronounced to the extent that the Fund invests a significant portion of its non-U.S. investments in one region or in the securities of emerging market issuers. These risks may include:

- less information about non-U.S. issuers or markets may be available due to less rigorous disclosure or accounting standards or regulatory practices;

24

- many non-U.S. markets are smaller, less liquid and more volatile and therefore, in a changing market, Calamos may not be able to sell the Fund's portfolio securities at times, in amounts and at prices it considers reasonable;

- the economies of non-U.S. countries may grow at slower rates than expected or may experience a downturn or recession;

- economic, political and social developments may adversely affect the securities markets, including expropriation and nationalization;

- the difficulty in obtaining or enforcing a court judgment in non-U.S. countries;

- restrictions on foreign investments in non-U.S. jurisdictions;

- difficulties in effecting the repatriation of capital invested in non-U.S. countries; and

- withholding and other non-U.S. taxes may decrease the Fund's return.

There may be less publicly available information about non-U.S. markets and issuers than is available with respect to U.S. securities and issuers. Non-U.S. companies generally are not subject to accounting, auditing and financial reporting standards, practices and requirements comparable to those applicable to U.S. companies. The trading markets for most non-U.S. securities are generally less liquid and subject to greater price volatility than the markets for comparable securities in the United States. The markets for securities in certain emerging markets are in the earliest stages of their development. Even the markets for relatively widely traded securities in certain non-U.S. markets, including emerging market countries, may not be able to absorb, without price disruptions, a significant increase in trading volume or trades of a size customarily undertaken by institutional investors in the United States.

Additionally, market making and arbitrage activities are generally less extensive in such markets, which may contribute to increased volatility and reduced liquidity.

Economies and social and political conditions in individual countries may differ unfavorably from the United States. Non-U.S. economies may have less favorable rates of growth of gross domestic product, rates of inflation, currency valuation, capital reinvestment, resource self-sufficiency and balance of payments positions. Many countries have experienced substantial, and in some cases extremely high, rates of inflation for many years. Inflation and rapid fluctuations in inflation rates have had, and may continue to have, very negative effects on the economies and securities markets of certain emerging market countries. Unanticipated political or social developments may also affect the values of the Fund's investments and the availability to the Fund of additional investments in such countries.

Currency Risk. The value of the securities denominated or quoted in foreign currencies may be adversely affected by fluctuations in the relative currency exchange rates and by exchange control regulations. The Fund's investment performance may be negatively affected by a devaluation of a currency in which the Fund's investments are denominated or quoted. Further, the Fund's investment performance may be significantly affected, either positively or negatively, by currency exchange rates because the U.S. dollar value of securities denominated or quoted in another currency will increase or decrease in response to changes in the value of such currency in relation to the U.S. dollar.

25

Interest Rate Risk. Fixed income securities, including high yield securities, are subject to certain common risks, including the following:

- If interest rates go up, the value of debt securities in the Fund's portfolio generally will decline.

- During periods of declining interest rates, the issuer of a security may exercise its option to prepay principal earlier than scheduled, forcing the Fund to reinvest in lower yielding securities. This is known as call or prepayment risk. Debt securities frequently have call features that allow the issuer to repurchase the security prior to its stated maturity. An issuer may redeem an obligation if the issuer can refinance the debt at a lower cost due to declining interest rates or an improvement in the credit standing of the issuer.

- During periods of rising interest rates, the average life of certain types of securities may be extended because of slower than expected principal payments. This may lock in a below market interest rate, increase the security's duration (the estimated period until the security is paid in full) and reduce the value of the security. This is known as extension risk.

- Market interest rates currently are at historically low levels.

Default Risk. Default risk refers to the risk that a company that issues a debt security will be unable to fulfill its obligations to repay principal and interest. The lower a debt security is rated, the greater its default risk.

Rule 144A Securities. The Fund may invest without limit in securities that have not been registered for public sale, but that are eligible for purchase and sale by certain qualified institutional buyers. Investments in Rule 144A Securities could have the effect of increasing the amount of the Fund's assets invested in illiquid securities if qualified institutional buyers are unwilling to purchase these Rule 144A Securities. Illiquid securities may be difficult to dispose of at a fair price at the times when the Fund believes it is desirable to do so. Investment of the Fund's assets in illiquid securities may restrict the Fund's ability to take advantage of market opportunities. The market price of illiquid securities generally is more volatile than that of more liquid securities, which may adversely affect the price that the Fund pays for or recovers upon the sale of illiquid securities. Illiquid securities are also more difficult to value and Calamos' judgment may play a greater role in the valuation process. The risks associated with illiquid securities may be particularly acute in situations in which the Fund's operations require cash and could result in the Fund borrowing to meet its short-term needs or incurring losses on the sale of illiquid securities.

Convertible Securities. Convertible securities generally offer lower interest or dividend yields than non-convertible securities of similar quality. The market values of convertible securities tend to decline as interest rates increase and, conversely, to increase as interest rates decline. However, the convertible's market value tends to reflect the market price of the common stock of the issuing company when that stock price is greater than the convertible's "conversion price." The conversion price is defined as the predetermined price at which the convertible could be exchanged for the associated stock. As the market price of the underlying common stock declines, the price of the convertible security tends to be influenced more by the yield of the convertible security. Thus, it may not decline in price to the same extent as the underlying common stock. In the event of a liquidation of the issuing company, holders of convertible securities would be paid before the company's common stockholders. Consequently, the issuer's convertible securities generally entail less risk than its common stock.

Synthetic Convertible Securities. The value of a synthetic convertible security may respond differently to market fluctuations than a convertible security because a synthetic convertible is composed of two or more separate securities, each with its own market value. In addition, if the value of the underlying common stock or the level of the index involved in the convertible component falls below the exercise price of the warrant or option, the warrant or option may lose all value.

Leverage. The Fund may issue preferred shares, borrow money or issue debt securities. The Fund currently anticipates that it will issue cumulative preferred shares, as soon as practicable after the closing

26

of this offering, with an aggregate liquidation preference of up to approximately 33% of the Fund's total assets immediately after issuance. As a non-fundamental policy, such preferred shares, borrowing or debt securities may not exceed 38% of the Fund's total assets. However, the Board of Trustees reserves the right to issue preferred shares or borrow to the extent permitted by the 1940 Act.

Leverage creates risks which may adversely affect the return for the holders of, and distributions on, common shares, including:

- the likelihood of greater volatility of net asset value and market price of common shares;

- fluctuations in the dividend rates on any preferred shares or in interest rates on borrowings and short-term debt;

- increased operating costs, which may reduce the Fund's total return; and

- the potential for a decline in the value of an investment acquired with borrowed funds, while the Fund's obligations under such borrowing remain fixed.

The Fund's use of leverage is premised upon the expectation that the Fund's preferred share dividends or borrowing cost will be lower than the return the Fund achieves on its investments with the proceeds of the issuance of preferred shares or borrowing. Such difference in return may result from the Fund's higher credit rating or the short-term nature of its borrowing compared to the long-term nature of its investments. Since the total assets of the Fund (including the assets obtained from leverage) will be invested in the higher yielding portfolio investments or portfolio investments with the potential for capital appreciation, the holders of common shares will be the beneficiaries of the incremental return. Should the differential between the underlying assets and cost of leverage narrow, the incremental return "pick up" will be reduced. Furthermore, if long-term interest rates rise or the Fund otherwise incurs losses on its investments, the Fund's net asset value attributable to its common shares will reflect the decline in the value of portfolio holdings resulting therefrom.

To the extent the income or capital appreciation derived from securities purchased with funds received from leverage exceeds the cost of leverage, the Fund's return will be greater than if leverage had not been used. Conversely, if the income or capital appreciation from the securities purchased with such funds is not sufficient to cover the cost of leverage or if the Fund incurs capital losses, the return of the Fund will be less than if leverage had not been used, and therefore the amount available for distribution to common shareholders as dividends and other distributions will be reduced or potentially eliminated. Common shareholders bear the cost of any leverage.

Certain types of borrowings may result in the Fund being subject to covenants in credit agreements, including those relating to asset coverage, borrowing base and portfolio composition requirements and additional covenants that may affect the Fund's ability to pay dividends and distributions on common shares in certain instances. The Fund may also be required to pledge its assets to the lenders in connection with certain types of borrowings. The Fund may be subject to certain restrictions on investments imposed by guidelines of one or more nationally recognized rating organizations which may issue ratings for the preferred shares or short-term debt instruments issued by the Fund. These guidelines may impose asset coverage or portfolio composition requirements that are more stringent than those imposed by the 1940 Act.

If the Fund's ability to make distributions on its common shares is limited, such limitation could, under certain circumstances, impair the ability of the Fund to maintain its qualification for taxation as a regulated investment company, which would have adverse tax consequences for shareholders. To the extent that the Fund is required, in connection with maintaining 1940 Act asset coverage requirements or otherwise, or elects to redeem any preferred shares or prepay any borrowings, the Fund may need to liquidate investments to fund such redemptions or prepayments. Liquidation at times of adverse economic conditions may result in capital loss and reduce returns to common shareholders.

27

Since Calamos' investment management fee is a percentage of the Fund's managed assets, Calamos' fee will be higher if the Fund is leveraged and Calamos will have an incentive to be more aggressive and leverage the Fund.

Interest Rate Transactions Risk. The Fund may enter into an interest rate swap or cap transaction to attempt to protect itself from increasing dividend or interest expenses on its preferred shares, debt securities or other borrowings resulting from increasing short-term interest rates. A decline in interest rates may result in a decline in the value of the swap or cap, which may result in a decline in the net asset value of the Fund.

Depending on the state of interest rates in general, the Fund's use of interest rate swap or cap transactions could enhance or harm the overall performance of the common shares. To the extent there is a decline in interest rates, the value of the interest rate swap or cap could decline, and could result in a decline in the net asset value of the common shares. In addition, if the counterparty to an interest rate swap or cap defaults, the Fund would not be able to use the anticipated net receipts under the swap or cap to offset the dividend or interest payments on the Fund's leverage.

Depending on whether the Fund would be entitled to receive net payments from the counterparty on the swap or cap, which in turn would depend on the general state of short-term interest rates at that point in time, such a default could negatively impact the performance of the common shares. In addition, at the time an interest rate swap or cap transaction reaches its scheduled termination date, there is a risk that the Fund would not be able to obtain a replacement transaction or that the terms of the replacement would not be as favorable as on the expiring transaction. If either of these events occurs, it could have a negative impact on the performance of the common shares.

If the Fund fails to maintain a required 200% asset coverage of the liquidation value of the outstanding preferred shares or if the Fund loses its expected rating on its preferred shares or fails to maintain other covenants with respect to its preferred shares, the Fund may be required to redeem some or all of the preferred shares. Similarly, the Fund could be required to prepay the principal amount of any debt securities or other borrowings. Such redemption or prepayment would likely result in the Fund seeking to terminate early all or a portion of any swap or cap transaction. Early termination of a swap could result in a termination payment by or to the Fund. Early termination of a cap could result in a termination payment to the Fund. The Fund intends to maintain in a segregated account with its custodian cash or liquid securities having a value at least equal to the Fund's net payment obligations under any swap transaction, marked-to-market daily.

Tax Risk. The Fund may invest in certain securities, such as certain convertible securities, for which the federal income tax treatment may not be clear or may be subject to recharacterization by the Internal Revenue Service. It could be more difficult for the Fund to comply with certain tax requirements applicable to regulated investment companies if the tax characterization of the Fund's investments or the tax treatment of the income from such investments were successfully challenged by the Internal Revenue Service. See "U.S. Federal Income Tax Matters."

Management Risk. Calamos' judgment about the attractiveness, relative value or potential appreciation of a particular sector, security or investment strategy may prove to be incorrect.

Antitakeover Provisions. The Fund's Agreement and Declaration of Trust and By-laws include provisions that could limit the ability of other entities or persons to acquire control of the Fund or to change the composition of its Board of Trustees. Such provisions could limit the ability of shareholders to sell their shares at a premium over prevailing market prices by discouraging a third party from seeking to obtain control of the Fund. These provisions include staggered terms of office for the Trustees, advance notice requirements for shareholder proposals, and super-majority voting requirements for certain transactions with affiliates, converting the Fund to an open-end investment company or a merger, asset sale or similar transaction. Holders of preferred shares will have voting rights in addition to and separate from the voting rights of common shareholders with respect to certain of these matters. See "Description of Shares -- Preferred Shares" and "Certain Provisions of the Agreement and Declaration of Trust and

28

By-Laws." The holders of preferred shares, on the one hand, and the holders of the common shares, on the other, may have interests that conflict in these situations.

Market Disruption Risk. Certain events have a disruptive effect on the securities markets, such as terrorist attacks (including the terrorist attacks in the United States on September 11, 2001), war and other geopolitical events, earthquakes, storms and other disasters. The Fund cannot predict the effects of similar events in the future on the markets or economy of the U.S. or other countries.

MANAGEMENT OF THE FUND

TRUSTEES AND OFFICERS

The Fund's Board of Trustees provides broad supervision over the affairs of the Fund. The officers of the Fund are responsible for the Fund's operations. Currently, there are seven Trustees of the Fund, three of whom are "interested persons" of the Trust (as defined in the 1940 Act) and four of whom are not "interested persons." The names and business addresses of the trustees and officers of the Fund and their principal occupations and other affiliations during the past five years are set forth under "Management of the Fund" in the statement of additional information.

INVESTMENT ADVISER

The Fund's investments are managed by Calamos, 1111 E. Warrenville Road, Naperville, IL. On , 2004 Calamos managed approximately $ billion in assets of individuals and institutions. Calamos is a wholly-owned subsidiary of Holdings. Holdings is controlled by John P. Calamos, who has been engaged in the investment advisory business since 1977.

INVESTMENT MANAGEMENT AGREEMENT

Subject to the overall authority of the Board of Trustees, Calamos regularly provides the Fund with investment research, advice and supervision and furnishes continuously an investment program for the Fund. In addition, Calamos furnishes for use of the Fund such office space and facilities as the Fund may require for its reasonable needs, supervises the business and affairs of the Fund and provides the following other services on behalf of the Fund and not provided by persons not a party to the investment management agreement: (a) preparing or assisting in the preparation of reports to and meeting materials for the Trustees; (b) supervising, negotiating contractual arrangements with, to the extent appropriate, and monitoring the performance of, accounting agents, custodians, depositories, transfer agents and pricing agents, accountants, attorneys, printers, underwriters, brokers and dealers, insurers and other persons in any capacity deemed to be necessary or desirable to Fund operations;
(c) assisting in the preparation and making of filings with the Commission and other regulatory and self-regulatory organizations, including, but not limited to, preliminary and definitive proxy materials, amendments to the Fund's registration statement on Form N-2 and semi-annual reports on Form N-SAR and Form N-CSR; (d) overseeing the tabulation of proxies by the Fund's transfer agent; (e) assisting in the preparation and filing of the Fund's federal, state and local tax returns; (f) assisting in the preparation and filing of the Fund's federal excise tax return pursuant to Section 4982 of the Code; (g) providing assistance with investor and public relations matters; (h) monitoring the valuation of portfolio securities and the calculation of net asset value; (i) monitoring the registration of shares of beneficial interest of the Fund under applicable federal and state securities laws; (j) maintaining or causing to be maintained for the Fund all books, records and reports and any other information required under the 1940 Act, to the extent that such books, records and reports and other information are not maintained by the Fund's custodian or other agents of the Fund; (k) assisting in establishing the accounting policies of the Fund;
(l) assisting in the resolution of accounting issues that may arise with respect to the Fund's operations and consulting with the Fund's independent accountants, legal counsel and the Fund's other agents as necessary in connection therewith;
(m) reviewing the Fund's bills; (n) assisting the Fund in determining the amount of dividends and distributions available to be paid by the Fund to its shareholders, preparing and arranging for the printing of dividend notices to shareholders, and providing the transfer and dividend paying agent, the custodian,

29

and the accounting agent with such information as is required for such parties to effect the payment of dividends and distributions; and (o) otherwise assisting the Fund as it may reasonably request in the conduct of the Fund's business, subject to the direction and control of the Trustees.

Under the investment management agreement, the Fund will pay to Calamos a fee based on the average weekly managed assets that is accrued daily and paid on a monthly basis. The fee paid by the Fund is at the annual rate of % of managed assets. Because the fees paid to Calamos are determined on the basis of the Fund's managed assets, Calamos' interest in determining whether to leverage the Fund may differ from the interests of the Fund and its common shareholders.

Under the terms of its investment management agreement, except for the services and facilities provided by Calamos as set forth therein, the Fund shall assume and pay all expenses for all other Fund operations and activities and shall reimburse Calamos for any such expenses incurred by Calamos. The expenses borne by the Fund shall include, without limitation: (a) organization expenses of the Fund (including out-of-pocket expenses, but not including Calamos' overhead or employee costs); (b) fees payable to Calamos; (c) legal expenses;
(d) auditing and accounting expenses; (e) maintenance of books and records that are required to be maintained by the Fund's custodian or other agents of the Fund; (f) telephone, telex, facsimile, postage and other communications expenses; (g) taxes and governmental fees; (h) fees, dues and expenses incurred by the Fund in connection with membership in investment company trade organizations and the expense of attendance at professional meetings of such organizations; (i) fees and expenses of accounting agents, custodians, subcustodians, transfer agents, dividend disbursing agents and registrars; (j) payment for portfolio pricing or valuation services to pricing agents, accountants, bankers and other specialists, if any; (k) expenses of preparing share certificates; (l) expenses in connection with the issuance, offering, distribution, sale, redemption or repurchase of securities issued by the Fund;
(m) expenses relating to investor and public relations provided by parties other than Calamos; (n) expenses and fees of registering or qualifying shares of beneficial interest of the Fund for sale; (o) interest charges, bond premiums and other insurance expenses; (p) freight, insurance and other charges in connection with the shipment of the Fund's portfolio securities; (q) the compensation and all expenses (specifically including travel expenses relating to Fund business) of Trustees, officers and employees of the Fund who are not affiliated persons of Calamos; (r) brokerage commissions or other costs of acquiring or disposing of any portfolio securities of the Fund; (s) expenses of printing and distributing reports, notices and dividends to shareholders; (t) expenses of preparing and setting in type, printing and mailing prospectuses and statements of additional information of the Fund and supplements thereto; (u) costs of stationery; (v) any litigation expenses; (w) indemnification of Trustees and officers of the Fund; (x) costs of shareholders' and other meetings; (y) interest on borrowed money, if any; and (z) the fees and other expenses of listing the Fund's shares on the New York Stock Exchange or any other national stock exchange.

PORTFOLIO MANAGER

John P. Calamos, Nick P. Calamos and John P. Calamos, Jr. are responsible for managing the portfolio of the Fund. During the past five years, John P. Calamos has been a Chairman, CEO and Co-Chief Investment Officer of Calamos; Nick P. Calamos has been a Senior Executive Vice President and Co-Chief Investment Officer of Calamos; and John P. Calamos, Jr. has been an Executive Vice President of Calamos. For over 20 years, the Calamos management team has managed money for their clients in convertible, high yield and global strategies. Furthermore, Calamos has extensive experience investing in foreign markets through its convertible securities and high yield securities strategies. Such experience has included investments in established as well as emerging foreign markets.

FUND ACCOUNTANT

Under the arrangements with State Street to provide fund accounting services, State Street provides certain administrative and accounting services to the Fund and such other funds advised by Calamos that may be part of those arrangements (the Fund and such other funds are collectively referred to as the "Calamos Funds") as described more fully in the statement of additional information. For the services

30

rendered to the Calamos Funds, State Street receives fees based on the combined managed assets of the Calamos Funds ("Combined Assets"). Each fund of the Calamos Funds pays its pro-rata share of the fees payable to State Street described below based on relative managed assets of each fund.

State Street receives a fee at the annual rate of .0225% for the first $3 billion of Combined Assets and .0150% for the Combined Assets in excess of $3 billion.

Calamos will provide the financial accounting services to the Calamos Funds described more fully in the statement of additional information, rather than State Street. For providing those services, Calamos will receive a fee at the annual rate of .0175% on the first $1 billion of Combined Assets; .0150% on the next $1 billion of Combined Assets; and .0110% on Combined Assets above $2 billion ("financial accounting service fee"). Each fund of the Calamos Funds will pay its pro-rata share of the financial accounting service fee to Calamos based on relative managed assets of each fund.

DIVIDENDS AND DISTRIBUTIONS;
AUTOMATIC DIVIDEND REINVESTMENT PLAN

DIVIDENDS AND DISTRIBUTIONS

Subject to the determination of the Board of Trustees to implement a Managed Dividend Policy, as described below, commencing with the first dividend, the Fund intends to distribute all or a portion of its net investment income monthly to holders of common shares. The Fund expects to declare the initial monthly dividend on the common shares within approximately 60 days of the completion of this offering and to pay that initial monthly dividend approximately 90 days after the completion of this offering. Dividends and distributions may be payable in cash or common shares, with the option to receive cash in lieu of the shares. The Fund may at times, and in its discretion, pay out less than the entire amount of net investment income earned in any particular period and may at times pay out such accumulated undistributed income in addition to net investment income earned in other periods in order to permit the Fund to maintain a more stable level of distributions. As a result, the dividend paid by the Fund to holders of common shares for any particular period may be more or less than the amount of net investment income earned by the Fund during such period. The Fund is not required to maintain a stable level of distributions to shareholders. For U.S. federal income tax purposes, the Fund is required to distribute substantially all of its net investment income each year to both reduce its federal income tax liability and to avoid a potential excise tax. The Fund intends to distribute substantially all of its net investment income and all realized capital gains, if any, at least annually.

In January 2004, Calamos, on behalf of itself and certain funds, filed an exemptive application with the Commission seeking an order under the 1940 Act facilitating the implementation of the Managed Dividend Policy. The application will be amended to include the Fund as a party. If, and when, Calamos, on behalf of itself and other parties, receives the requested relief, the Fund may, subject to the determination of its Board of Trustees, implement a Managed Dividend Policy. Pursuant to its distribution policy, the Fund intends to make regular distributions on its common shares. Prior to the implementation of a Managed Dividend Policy, it is possible that the total distributions for a year will exceed the Fund's investment company taxable income and net capital gain for that year. This excess will generally constitute a return of capital. Even after the implementation of a Managed Dividend Policy, Fund distributions may include a return of capital. Return of capital distributions, to the extent that they exceed the Fund's current and accumulated earnings and profits are generally tax-free up to the amount of a shareholder's tax basis in the common shares.

Under a Managed Dividend Policy, the Fund would intend to distribute a monthly fixed percentage of net asset value to common shareholders. Under a Managed Dividend Policy, if, for any distribution, net investment income and net realized capital gains were less than the amount of the distribution, the differences would be distributed from the Fund's assets. In addition, in order to make such distributions, the Fund might have to sell a portion of its investment portfolio at a time when independent investment

31

judgment might not dictate such action. The Fund's final distribution for each calendar year would include any remaining net investment income and net realized capital gains, if any, undistributed during the year.

If, for any calendar year, the Fund's total distributions exceeded net investment income and net realized capital gains (the "Excess"), the Excess, distributed from the Fund's assets, would generally be treated as dividend income to the extent of the Fund's current and accumulated earnings and profits. Thereafter, such Excess would be treated as a tax-free return of capital up to the amount of the common shareholder's tax basis in his, her or its common shares, with any amounts exceeding such basis treated as gain from the sale of common shares. See "U.S. Federal Income Tax Matters." Pursuant to the requirements of the 1940 Act and other applicable laws, a notice would accompany each monthly distribution with respect to the estimated source of the distribution made.

In the event the Fund distributed the Excess, such distribution would decrease the Fund's total assets and, therefore, have the likely effect of increasing the Fund's expense ratio. There is a risk that the Fund would not eventually realize capital gains in an amount corresponding to a distribution of the Excess.

There is no guarantee that the Fund will receive an exemptive order facilitating the implementation of a Managed Dividend Policy or, if received, that the Board of Trustees will determine to implement a Managed Dividend Policy. The Board of Trustees reserves the right to change the dividend policy from time to time.

Under the 1940 Act, the Fund is not permitted to incur indebtedness unless immediately after such incurrence the Fund has an asset coverage of at least 300% of the aggregate outstanding principal balance of indebtedness. Additionally, under the 1940 Act, the Fund may not declare any dividend or other distribution upon any class of its capital shares, or purchase any such capital shares, unless the aggregate indebtedness of the Fund has, at the time of the declaration of any such dividend or distribution or at the time of any such purchase, an asset coverage of at least 300% after deducting the amount of such dividend, distribution, or purchase price, as the case may be.

While any preferred shares are outstanding, the Fund may not declare any cash dividend or other distribution on its common shares, unless at the time of such declaration, (1) all accumulated preferred dividends have been paid and (2) the net asset value of the Fund's portfolio (determined after deducting the amount of such dividend or other distribution) is at least 200% of the liquidation value of the outstanding preferred shares (expected to be equal to the original purchase price per share plus any accumulated and unpaid dividends thereon).

In addition to the limitations imposed by the 1940 Act described above, certain lenders may impose additional restrictions on the payment of dividends or distributions on the common shares in the event of a default on the Fund's borrowings. If the Fund's ability to make distributions on its common shares is limited, such limitation could, under certain circumstances, impair the ability of the Fund to maintain its qualification for taxation as a regulated investment company, which would have adverse tax consequences for the Fund and its shareholders. See "Leverage" and "U.S. Federal Income Tax Matters."

See "-- Automatic Dividend Reinvestment Plan" for information concerning the manner in which dividends and distributions to common shareholders may be automatically reinvested in common shares. Dividends and distributions may be taxable to shareholders whether they are reinvested in shares of the Fund or received in cash.

The yield on the Fund's common shares will vary from period to period depending on factors including, but not limited to, market conditions, the timing of the Fund's investment in portfolio securities, the securities comprising the Fund's portfolio, changes in interest rates including changes in the relationship between short-term rates and long-term rates, the amount and timing of the use of borrowings and other leverage by the Fund, the effects of leverage on the common shares discussed above under "Leverage," the timing of the investment of leverage proceeds in portfolio securities, the Fund's net assets and its operating expenses. Consequently, the Fund cannot guarantee any particular yield on its shares and the yield for any given period is not an indication or representation of future yields on the Fund's shares.

32

AUTOMATIC DIVIDEND REINVESTMENT PLAN

Pursuant to the Fund's Automatic Dividend Reinvestment Plan ("Plan"), unless a shareholder is ineligible or elects otherwise, all dividend and capital gains distributions are automatically reinvested by The Bank of New York, as agent for shareholders in administering the Plan ("Plan Agent"), in additional common shares of the Fund. Shareholders who elect not to participate in the Plan will receive all dividends and distributions payable in cash paid by check mailed directly to the shareholder of record (or, if the shares are held in street or other nominee name, then to such nominee) by The Bank of New York, as dividend paying agent. Such shareholders may elect not to participate in the Plan and to receive all dividends and distributions in cash by sending written instructions to The Bank of New York, as dividend paying agent, at the address set forth below. Participation in the Plan is completely voluntary and may be terminated or resumed at any time without penalty by giving notice in writing to the Plan Agent; such termination will be effective with respect to a particular dividend or distribution if notice is received prior to the record date for the applicable distribution.

Whenever the Fund declares a dividend or distribution payable either in shares or in cash, non-participants in the Plan will receive cash, and participants in the Plan will receive the equivalent in shares of common shares. The shares are acquired by the Plan Agent for the participant's account, depending upon the circumstances described below, either (i) through receipt of additional common shares from the Fund ("newly issued shares") or (ii) by purchase of outstanding common shares on the open market ("open-market purchases") on the New York Stock Exchange or elsewhere. If, on the payment date, the net asset value per share of the common shares is equal to or less than the market price per common share plus estimated brokerage commissions (such condition being referred to herein as "market premium"), the Plan Agent will receive newly issued shares from the Fund for each participant's account. The number of newly issued common shares to be credited to the participant's account will be determined by dividing the dollar amount of the dividend or distribution by the greater of (i) the net asset value per common share on the payment date, or (ii) 95% of the market price per common share on the payment date.

If, on the payment date, the net asset value per common share exceeds the market price plus estimated brokerage commissions (such condition being referred to herein as "market discount"), the Plan Agent has until the last business day before the next date on which the shares trade on an "ex-dividend" basis or in no event more than 30 days after the payment date ("last purchase date") to invest the dividend or distribution amount in shares acquired in open-market purchases. It is contemplated that the Fund will pay monthly income dividends. Therefore, the period during which open-market purchases can be made will exist only from the payment date on the dividend through the date before the next ex- dividend date, which typically will be approximately ten days. The weighted average price (including brokerage commissions) of all common shares purchased by the Plan Agent as Plan Agent will be the price per common share allocable to each participant. If, before the Plan Agent has completed its open-market purchases, the market price of a common share exceeds the net asset value per share, the average per share purchase price paid by the Plan Agent may exceed the net asset value of the Fund's shares, resulting in the acquisition of fewer shares than if the dividend had been paid in newly issued shares on the payment date. Because of the foregoing difficulty with respect to open-market purchases, the Plan provides that if the Plan Agent is unable to invest the full dividend amount in open-market purchases during the purchase period or if the market discount shifts to a market premium during the purchase period, the Plan Agent will cease making open-market purchases and will invest the uninvested portion of the dividend or distribution amount in newly issued shares at the close of business on the last purchase date.

The Plan Agent maintains all shareholders' accounts in the Plan and furnishes written confirmation of each acquisition made for the participant's account as soon as practicable, but in no event later than 60 days after the date thereof. Shares in the account of each Plan participant will be held by the Plan Agent in non-certificated form in the Plan Agent's name or that of its nominee, and each shareholder's proxy will include those shares purchased or received pursuant to the Plan. The Plan Agent will forward all proxy solicitation materials to participants and vote proxies for shares held pursuant to the Plan first in

33

accordance with the instructions of the participants then with respect to any proxies not returned by such participant, in the same proportion as the Plan Agent votes the proxies returned by the participants.

There will be no brokerage charges with respect to shares issued directly by the Fund as a result of dividends or distributions payable either in shares or in cash. However, each participant will pay a pro rata share of brokerage commissions incurred with respect to the Plan Agent's open-market purchases in connection with the reinvestment of dividends or distributions. If a participant elects to have the Plan Agent sell part or all of his or her common shares and remit the proceeds, such participant will be charged his or her pro rata share of brokerage commissions on the shares sold, plus a $15 transaction fee.

The automatic reinvestment of dividends and distributions will not relieve participants of any federal, state or local income tax that may be payable (or required to be withheld) on such dividends. See "U.S. Federal Income Tax Matters."

Shareholders participating in the Plan may receive benefits not available to shareholders not participating in the Plan. If the market price plus commissions of the Fund's shares is higher than the net asset value, participants in the Plan will receive shares of the Fund at less than they could otherwise purchase them and will have shares with a cash value greater than the value of any cash distribution they would have received on their shares. If the market price plus commissions is below the net asset value, participants receive distributions of shares with a net asset value greater than the value of any cash distribution they would have received on their shares. However, there may be insufficient shares available in the market to make distributions in shares at prices below the net asset value. Also, since the Fund does not redeem its shares, the price on resale may be more or less than the net asset value. See "U.S. Federal Income Tax Matters" for a discussion of tax consequences of the Plan.

Experience under the Plan may indicate that changes are desirable. Accordingly, the Fund reserves the right to amend or terminate the Plan if in the judgment of the Board of Trustees such a change is warranted. The Plan may be terminated by the Plan Agent or the Fund upon notice in writing mailed to each participant at least 60 days prior to the effective date of the termination. Upon any termination, the Plan Agent will cause a certificate or certificates to be issued for the full shares held by each participant under the Plan and cash adjustment for any fraction of a common share at the then current market value of the common shares to be delivered to him or her. If preferred, a participant may request the sale of all of the common shares held by the Plan Agent in his or her Plan account in order to terminate participation in the Plan. If such participant elects in advance of such termination to have the Plan Agent sell part or all of his shares, the Plan Agent is authorized to deduct from the proceeds a $15.00 fee plus the brokerage commissions incurred for the transaction. If a participant has terminated his or her participation in the Plan but continues to have common shares registered in his or her name, he or she may re-enroll in the Plan at any time by notifying the Plan Agent in writing at the address below. The terms and conditions of the Plan may be amended by the Plan Agent or the Fund at any time but, except when necessary or appropriate to comply with applicable law or the rules or policies of the Commission or any other regulatory authority, only by mailing to each participant appropriate written notice at least 30 days prior to the effective date thereof. The amendment shall be deemed to be accepted by each participant unless, prior to the effective date thereof, the Plan Agent receives notice of the termination of the participant's account under the Plan. Any such amendment may include an appointment by the Plan Agent of a successor Plan Agent, subject to the prior written approval of the successor Plan Agent by the Fund. There is no direct service charge to participants in the Plan; however, the Fund reserves the right to amend the Plan to include a service charge payable by the participants.

All correspondence concerning the Plan should be directed to the Plan Agent at Dividend Reinvestment Department, P.O. Box 1958, Newark, NJ 07101-9774.

CLOSED-END FUND STRUCTURE

The Fund is a newly organized, diversified, closed-end management investment company (commonly referred to as a closed-end fund). Closed-end funds differ from open-end management investment

34

companies (which are generally referred to as mutual funds) in that closed-end funds generally list their shares for trading on a stock exchange and do not redeem their shares at the request of the shareholder. This means that if you wish to sell your shares of a closed-end fund you must trade them on the market like any other stock at the prevailing market price at that time. In a mutual fund, if the shareholder wishes to sell shares of the fund, the mutual fund will redeem or buy back the shares at "net asset value." Also, mutual funds generally offer new shares on a continuous basis to new investors, and closed-end funds generally do not. The continuous inflows and outflows of assets in a mutual fund can make it difficult to manage the fund's investments. By comparison, closed-end funds are generally able to stay more fully invested in securities that are consistent with their investment objectives and also have greater flexibility to make certain types of investments and to use certain investment strategies, such as financial leverage and investments in illiquid securities.

Shares of closed-end funds frequently trade at a discount to their net asset value. To the extent the common shares do trade at a discount, the Fund's Board of Trustees may from time to time engage in open-market repurchases or tender offers for shares after balancing the benefit to shareholders of the increase in the net asset value per share resulting from such purchases against the decrease in the assets of the Fund and potential increase in the expense ratio of expenses to assets of the Fund. The Board of Trustees believes that in addition to the beneficial effects described above, any such purchases or tender offers may result in the temporary narrowing of any discount but will not have any long-term effect on the level of any discount. We cannot guarantee or assure, however, that the Fund's Board of Trustees will decide to engage in any of these actions. Nor is there any guarantee or assurance that such actions, if undertaken, would result in the shares trading at a price equal or close to net asset value per share. The Board of Trustees might also consider converting the Fund to an open-end mutual fund, which would also require a vote of the shareholders of the Fund. Conversion of the Fund to an open-end mutual fund would require an amendment to the Fund's Declaration of Trust. Such an amendment would require the favorable vote of the holders of at least 75% of the Fund's outstanding shares (including any preferred shares) entitled to be voted on the matter, voting as a single class (or a majority of such shares if the amendment were previously approved, adopted or authorized by 75% of the total number of Trustees fixed in accordance with the By-laws), and, assuming preferred shares are issued, the affirmative vote of a majority of outstanding preferred shares, voting as a separate class.

U.S. FEDERAL INCOME TAX MATTERS

The following is a description of certain U.S. federal income tax consequences to a shareholder that acquires, holds and/or disposes of common shares of the Fund. The discussion reflects applicable tax laws of the United States as of the date of this prospectus, which tax laws may be changed or subject to new interpretations by the courts or the Internal Revenue Service ("IRS") retroactively or prospectively. No attempt is made to present a detailed explanation of U.S. federal income tax concerns affecting the Fund and its shareholders, and the discussion set forth herein does not constitute tax advice. In addition, no attempt is made to present state, local or foreign tax concerns or tax concerns applicable to an investor with a special tax status such as a financial institution or non-U.S. investors. INVESTORS ARE URGED TO CONSULT THEIR OWN TAX ADVISORS TO DETERMINE THE TAX CONSEQUENCES TO THEM BEFORE INVESTING IN THE FUND.

The Fund intends to elect to be treated, and to qualify each year, as a "regulated investment company" under Subchapter M of the Internal Revenue Code of 1986, as amended (the "Code"), so that it will not pay U.S. federal income tax on income and capital gains timely distributed to shareholders. If the Fund qualifies as a regulated investment company and distributes to its shareholders at least 90% of the sum of (i) its "investment company taxable income" as that term is defined in the Code (which includes, among other things, dividends, taxable interest, the excess of any net short-term capital gains over net long-term capital losses and certain net foreign exchange gains as reduced by certain deductible expenses) without regard to the deduction for dividends paid and (ii) the excess of its gross tax-exempt interest, if any, over certain disallowed deductions, the Fund will be relieved of U.S. federal income tax on any income of the Fund, including long-term capital gains, distributed to shareholders. However, if the Fund retains any investment company taxable income or "net capital gain" (the excess of net long-term

35

capital gain over net short-term capital loss), it will be subject to U.S. federal income tax at regular corporate rates (currently at the maximum rate of 35%) on the amount retained. The Fund intends to distribute at least annually all or substantially all of its investment company taxable income, net tax- exempt interest, and net capital gain. Under the Code, the Fund will generally be subject to a nondeductible 4% federal excise tax on the portion of its undistributed ordinary income and capital gains if it fails to meet certain distribution requirements with respect to each calendar year. The Fund intends to make distributions in a timely manner and accordingly does not expect to be subject to the excise tax.

If for any taxable year the Fund did not qualify as a regulated investment company for U.S. federal income tax purposes, it would be treated as a U.S. corporation subject to U.S. federal income tax and distributions to its shareholders would not be deducted by the Fund in computing its taxable income. In such event, the Fund's distributions, to the extent derived from the Fund's current or accumulated earnings and profits, would generally constitute ordinary dividends, which would generally be eligible for the dividends received deduction available to corporate shareholders, and non corporate shareholders would generally be able to treat such distributions as "qualified dividend income" eligible for reduced rates of U.S. federal income taxation in taxable years beginning on or before December 31, 2008.

Unless a shareholder is ineligible to participate or elects otherwise, all distributions will be automatically reinvested in additional shares of common stock of the Fund pursuant to the Plan. For U.S. federal income tax purposes, all dividends are taxable whether a shareholder takes them in cash or they are reinvested pursuant to the Plan in additional shares of the Fund. Distributions of investment company taxable income are generally taxable as ordinary income to the extent of the Fund's current and accumulated earnings and profits. However, a portion of such distributions derived from certain corporate dividends may qualify for either the dividends received deduction available to corporate shareholders under Section 243 of the Code or the reduced rates of U.S. federal income taxation for "qualified dividend income" currently available to noncorporate shareholders under Section 1(h)(11) of the Code, provided certain holding period and other requirements are met. Distributions of net capital gain, if any, are generally taxable as long-term capital gains for U.S. federal income tax purposes without regard to the length of time the shareholder has held shares of the Fund. A distribution of an amount in excess of the Fund's current and accumulated earnings and profits, if any, will be treated by a shareholder as a tax-free return of capital which is applied against and reduces the shareholder's basis in his or her shares. To the extent that the amount of any such distribution exceeds the shareholder's basis in his or her shares, the excess will be treated by the shareholder as gain from the sale or exchange of shares. The U.S. federal income tax status of all distributions will be designated by the Fund and reported to the shareholders annually.

If the Fund retains any net capital gain, the Fund may designate the retained amount as undistributed capital gains in a notice to shareholders who, if subject to U.S. federal income tax on long-term capital gains, (i) will be required to include in income as long-term capital gain, their proportionate share of such undistributed amount, and (ii) will be entitled to credit their proportionate share of the tax paid by the Fund on the undistributed amount against their U.S. federal income tax liabilities, if any, and to claim refunds to the extent the credit exceeds such liabilities. If such an event occurs, the tax basis of shares owned by a shareholder of the Fund will, for U.S. federal income tax purposes, generally be increased by the difference between the amount of undistributed net capital gain included in the shareholder's gross income and the tax deemed paid by the shareholders.

If a shareholder's distributions are automatically reinvested pursuant to the Plan and the Plan Agent invests the distribution in shares acquired on behalf of the shareholder in open-market purchases, for U.S. federal income tax purposes, the shareholder will be treated as having received a taxable distribution in the amount of the cash dividend that the shareholder would have received if the shareholder had elected to receive cash. If a shareholder's distributions are automatically reinvested pursuant to the Plan and the Plan Agent invests the distribution in newly issued shares of the Fund, the shareholder will be treated as receiving a taxable distribution equal to the fair market value of the stock the shareholder receives.

36

Sales and other dispositions of the Fund's shares generally are taxable events for shareholders that are subject to U.S. federal income tax. Shareholders should consult their own tax advisors with reference to their individual circumstances to determine whether any particular transaction in the Fund's shares is properly treated as a sale or exchange for tax purposes, as the following discussion assumes, and the tax treatment of any gains or losses recognized in such transactions. Gain or loss will generally be equal to the difference between the amount of cash and the fair market value of other properly realized and the shareholders adjusted tax basis in the shares sold or exchanged. Such gain or loss will generally be characterized as capital gain or loss and will generally be long-term or short-term depending on the shareholders holding period of the shares disposed. However, any loss realized by a shareholder upon the sale or other disposition of shares with a tax holding period of six months or less will be treated as a long-term capital loss to the extent of any amounts treated as distributions of long-term capital gain with respect to such shares. The availability to deduct capital losses may be limited. In addition, losses on sales or other dispositions of shares may be disallowed under the "wash sale" rules in the event that substantially identical shares are acquired (including those made pursuant to reinvestment of dividends) within a period of 61 days beginning 30 days before and ending 30 days after a sale or other disposition of shares. In such a case, the disallowed portion of any loss generally would be included in the U.S. federal tax basis of the shares acquired in the other investments.

The Fund is required in certain circumstances to backup withhold at a current rate of 28% on reportable payments including dividends, capital gain distributions, and proceeds of sales or other dispositions of the Fund's shares paid to certain holders of the Fund's shares who do not furnish the Fund with their correct social security number or other taxpayer identification number and certain other certifications, or who are otherwise subject to backup withholding. Backup withholding is not an additional tax. Any amounts withheld from payments made to a shareholder may be refunded or credited against such shareholder's U.S. federal income tax liability, if any, provided that the required information is furnished to the IRS.

THE FOREGOING IS A GENERAL AND ABBREVIATED SUMMARY OF THE PROVISIONS OF THE CODE AND THE TREASURY REGULATIONS THEREUNDER IN EFFECT AS THEY DIRECTLY GOVERN THE TAXATION OF THE FUND AND ITS SHAREHOLDERS. THESE PROVISIONS ARE SUBJECT TO CHANGE BY LEGISLATIVE OR ADMINISTRATIVE ACTION, AND ANY SUCH CHANGE MAY BE RETROACTIVE. A MORE COMPLETE DISCUSSION OF THE TAX RULES APPLICABLE TO THE FUND CAN BE FOUND IN THE STATEMENT OF ADDITIONAL INFORMATION WHICH IS INCORPORATED BY REFERENCE INTO THIS PROSPECTUS. SHAREHOLDERS ARE URGED TO CONSULT THEIR TAX ADVISORS REGARDING SPECIFIC QUESTIONS AS TO U.S. FEDERAL, FOREIGN, STATE, AND LOCAL INCOME OR OTHER TAXES BEFORE MAKING AN INVESTMENT IN THE FUND.

NET ASSET VALUE

Net asset value per share is determined as of the close of regular session trading on the New York Stock Exchange (usually 4:00 p.m., Eastern time), on the last business day in each week. Net asset value is calculated by dividing the value of all of the securities and other assets of the Fund, less its liabilities (including accrued expenses and indebtedness) and the aggregate liquidation value of any outstanding preferred shares, by the total number of common shares outstanding. Currently, the net asset values of shares of publicly traded closed-end investment companies are published in Barron's, the Monday edition of The Wall Street Journal and the Monday and Saturday editions of The New York Times.

The values of the securities in the Fund are based on market prices from the primary market in which they are traded. As a general rule, equity securities listed on a U.S. securities exchange are valued at the last current reported sale price as of the time of valuation. Securities quoted on the NASDAQ National Market System are valued at the Nasdaq Official Closing Price ("NOCP"), as determined by Nasdaq, or lacking an NOCP, at the last current reported sale price as of the time of valuation. Bonds and other fixed-income securities that are traded over the counter and on an exchange will be valued according to the broadest and most representative market, and it is expected this will ordinarily be the over-the-counter market. The foreign securities held by a Fund are traded on exchanges throughout the world. Trading on these foreign securities exchanges is completed at various times throughout the day and often

37

does not coincide with the close of trading on the New York Stock Exchange. The value of foreign securities is determined at the close of trading of the exchange on which the securities are traded or at the close of trading on the New York Stock Exchange, whichever is earlier. If market prices are not readily available or the Fund's valuation methods do not produce a value reflective of the fair value of the security, securities and other assets are priced at a fair value as determined by the Fund's Board of Trustees or a committee thereof.

DESCRIPTION OF SHARES

The Fund is authorized to issue an unlimited number of common shares, without par value. The Fund is also authorized to issue preferred shares. Upon the completion of this offering, the Fund will only have common shares outstanding. The Fund's Board of Trustees is authorized, however, to classify and reclassify any unissued shares into one or more additional classes or series of shares. The Board of Trustees may establish such series or class, including preferred shares, from time to time by setting or changing in any one or more respects the designations, preferences, conversion or other rights, voting powers, restrictions, limitations as to dividends, qualifications or terms or conditions of redemption of such shares and pursuant to such classification or reclassification to increase or decrease the number of authorized shares of any existing class or series. The Board of Trustees, without shareholder approval, is authorized to amend the Fund's Agreement and Declaration of Trust and By-laws to reflect the terms of any such class or series, including any class of preferred shares. The Fund currently anticipates that it will issue preferred shares as soon as practicable after the closing of this offering. See "Leverage." The Fund is also authorized to issue other securities, including debt securities.

COMMON SHARES

Common shares, when issued and outstanding, will be fully paid and non-assessable. Shareholders are entitled to share pro rata in the net assets of the Fund available for distribution to common shareholders upon liquidation of the Fund. Common shareholders are entitled to one vote for each share held.

In the event that the Fund issues preferred shares and so long as any shares of the Fund's preferred shares are outstanding, holders of common shares will not be entitled to receive any net income of or other distributions from the Fund unless all accumulated dividends on preferred shares have been paid, and unless asset coverage (as defined in the 1940 Act) with respect to preferred shares would be at least 200% after giving effect to such distributions. See "Leverage."

The Fund will send unaudited reports at least semiannually and audited annual financial statements to all of its shareholders.

Calamos provided the initial capital for the Fund by purchasing common shares of the Fund for $ . As of the date of this prospectus, Calamos owned 100% of the outstanding common shares. Calamos may be deemed to control the Fund until such time as it owns less than 25% of the outstanding shares of the Fund.

PREFERRED SHARES

The Fund currently anticipates issuing, as soon as practicable after the closing of this offering, cumulative preferred shares with an aggregate liquidation preference of up to approximately 33% of the Fund's total assets immediately after issuance. As a non-fundamental policy, the Fund may not issue preferred shares (or borrow money and issue debt securities) with an aggregate liquidation preference (or aggregate principal amount) exceeding 38% of the Fund's total assets. However, the Board of Trustees reserves the right to issue preferred shares to the extent permitted by the 1940 Act, which currently limits the aggregate liquidation preference of all outstanding preferred shares to 50% of the value of the Fund's total assets less the Fund's liabilities and indebtedness. Although the terms of any preferred shares, including dividend rate, liquidation preference and redemption provisions, will be determined by the Fund's Board of Trustees, subject to applicable law and the Fund's Agreement and Declaration of Trust, it is

38

likely that the preferred shares will be structured to carry a relatively short-term dividend rate reflecting interest rates on short-term bonds by providing for the periodic redetermination of the dividend rate at relatively short intervals through an auction, remarketing or other procedure. The Fund also believes that it is likely that the liquidation preference, voting rights and redemption provisions of the preferred shares will be similar to those stated below.

In the event of any voluntary or involuntary liquidation, dissolution or winding up of the Fund, the holders of preferred shares will be entitled to receive a preferential liquidating distribution, which is expected to equal the original purchase price per preferred share plus accumulated and unpaid dividends, whether or not declared, before any distribution of assets is made to holders of common shares. After payment of the full amount of the liquidating distribution to which they are entitled, the holders of preferred shares will not be entitled to any further participation in any distribution of assets by the Fund.

The 1940 Act requires that the holders of any preferred shares, voting separately as a single class, have the right to elect at least two Trustees at all times. The remaining Trustees will be elected by holders of common shares and preferred shares, voting together as a single class. In addition, subject to the prior rights, if any, of the holders of any other class of senior securities outstanding, the holders of any preferred shares have the right to elect a majority of the Trustees at any time two years' accumulated dividends on any preferred shares are unpaid. The 1940 Act also requires that, in addition to any approval by shareholders that might otherwise be required, the approval of the holders of a majority of any outstanding preferred shares, voting separately as a class, would be required to (1) adopt any plan of reorganization that would adversely affect the preferred shares, and (2) take any action requiring a vote of security holders under Section 13(a) of the 1940 Act, including, among other things, changes in the Fund's subclassification as a closed-end investment company or changes in its fundamental investment restrictions. See "Certain Provisions of the Agreement and Declaration of Trust and By-Laws." As a result of these voting rights, the Fund's ability to take any such actions may be impeded to the extent that there are any preferred shares outstanding. The Fund's Board of Trustees presently intends that, except as otherwise indicated in this prospectus and except as otherwise required by applicable law, holders of preferred shares will have equal voting rights with holders of common shares (one vote per share, unless otherwise required by the 1940 Act) and will vote together with holders of common shares as a single class.

The affirmative vote of the holders of a majority of the outstanding preferred shares, voting as a separate class, will be required to amend, alter or repeal any of the preferences, rights or powers of holders of preferred shares so as to affect materially and adversely such preferences, rights or powers, or to increase or decrease the authorized number of preferred shares. The class vote of holders of preferred shares described above will in each case be in addition to any other vote required to authorize the action in question.

The terms of the preferred shares are expected to provide that (i) they are redeemable by the Fund in whole or in part at the original purchase price per share plus accrued dividends per share, (ii) the Fund may tender for or purchase preferred shares and (iii) the Fund may subsequently resell any shares so tendered for or purchased. Any redemption or purchase of preferred shares by the Fund will reduce the leverage applicable to the common shares, while any resale of shares by the Fund will increase that leverage.

The discussion above describes the possible offering of preferred shares by the Fund. If the Fund's Board of Trustees determines to proceed with such an offering, the terms of the preferred shares may be the same as, or different from, the terms described above, subject to applicable law and the Agreement and Declaration of Trust. The Board of Trustees, without the approval of the holders of common shares, may authorize an offering of preferred shares or may determine not to authorize such an offering, and may fix the terms of the preferred shares to be offered.

39

CERTAIN PROVISIONS OF THE AGREEMENT AND
DECLARATION OF TRUST AND BY-LAWS

The Fund's Agreement and Declaration of Trust includes provisions that could have the effect of limiting the ability of other entities or persons to acquire control of the Fund or to change the composition of its Board of Trustees and could have the effect of depriving shareholders of an opportunity to sell their shares at a premium over prevailing market prices by discouraging a third party from seeking to obtain control of the Fund. These provisions, however, have the advantage of potentially requiring persons seeking control of the Fund to negotiate with its management regarding the price to be paid and facilitating the continuity of the Fund's investment objective and policies. The Board of Trustees of the Fund has considered these provisions and concluded that they are in the best interests of the Fund.

The Board of Trustees is divided into three classes and the terms of the Trustees of the different classes are staggered. A Trustee may be removed from office with or without cause by a vote of at least a majority of the then Trustees if such removal is approved by the holders of at least 75% of the shares entitled to vote with respect to the election of such Trustee and present in person or by proxy at a meeting of shareholders called for such purpose.

In addition, the Agreement and Declaration of Trust requires the affirmative vote of at least 75% of the outstanding shares entitled to vote on the matter for the Trust to merge or consolidate with any other corporation, association, trust or other organization or to sell, lease or exchange all or substantially all of the Fund's assets; unless such action has been approved, adopted or authorized by the affirmative vote of at least 75% of the Trustees then in office, in which case, the affirmative vote of a majority of the outstanding shares entitled to vote on the matter is required.

In addition, conversion of the Fund to an open-end investment company would require an amendment to the Fund's Agreement and Declaration of Trust. Such an amendment would require the favorable vote of a majority of the then Trustees followed by a favorable vote of the holders of at least 75% of the shares entitled to vote on the matter, voting as separate classes or series (or a majority of such shares if the amendment was previously approved by 75% of the Trustees). Such a vote also would satisfy a separate requirement in the 1940 Act that the change be approved by the shareholders.

Shareholders of an open-end investment company may require the company to redeem their shares of common stock at any time (except in certain circumstances as authorized by or under the 1940 Act) at their net asset value, less such redemption charge, if any, as might be in effect at the time of a redemption. If the Fund is converted to an open-end investment company, it could be required to liquidate portfolio securities to meet requests for redemption, and the common shares would no longer be listed on the New York Stock Exchange. Conversion to an open-end investment company would also require changes in certain of the Fund's investment policies and restrictions.

In addition, the Agreement and Declaration of Trust requires the affirmative vote or consent of a majority of the then Trustees followed by the affirmative vote or consent of the holders of at least 75% of the shares of each affected class or series of the Fund outstanding, voting separately as a class or series, to approve, adopt or authorize certain transactions with 5% or greater holders of a class or series of shares and their associates, unless the transaction has been approved by at least 75% of the Trustees, in which case a majority of the outstanding shares entitled to vote shall be required. For purposes of these provisions, a 5% or greater holder of a class or series of shares (a "Principal Shareholder") refers to any person who, whether directly or indirectly and whether alone or together with its affiliates and associates, beneficially owns 5% or more of the outstanding shares of any class or series of shares of beneficial interest of the Fund. The 5% holder transactions subject to these special approval requirements are:

- the merger or consolidation of the Fund or any subsidiary of the Fund with or into any Principal Shareholder;

40

- the issuance of any securities of the Fund to any Principal Shareholder for cash; or

- the sale, lease or exchange to the Fund or any subsidiary of the Fund in exchange for securities of the Fund, of any assets of any Principal Shareholder, except assets having an aggregate fair market value of less than $1,000,000, aggregating for the purpose of such computation all assets sold, leased or exchanged in any series of similar transactions within a 12-month period.

The Fund may be terminated by the affirmative vote of not less than 75% of the Trustees then in office by written notice to the shareholders.

The Agreement and Declaration of Trust and By-laws provide that the Board of Trustees has the power, to the exclusion of shareholders, to make, alter or repeal any of the By-laws (except for any By-law specified not to be amended or repealed by the Board), subject to the requirements of the 1940 Act. Neither this provision of the Agreement and Declaration of Trust, nor any of the foregoing provisions thereof requiring the affirmative vote of 75% of outstanding shares of the Fund, can be amended or repealed except by the vote of such required number of shares.

The Fund's By-laws generally require that advance notice be given to the Fund in the event a shareholder desires to nominate a person for election to the Board of Trustees or to transact any other business at an annual meeting of shareholders. With respect to an annual meeting following the first annual meeting of shareholders, notice of any such nomination or business must be delivered to or received at the principal executive offices of the Fund not less than 90 calendar days nor more than 120 calendar days prior to the anniversary date of the prior year's annual meeting (subject to certain exceptions). In the case of the first annual meeting of shareholders, the notice must be given no later than the tenth calendar day following public disclosure as specified in the By-laws of the date of the meeting. Any notice by a shareholder must be accompanied by certain information as provided in the By-laws.

41

UNDERWRITING

Subject to the terms and conditions stated in the Fund's purchase agreement dated , 2004, each underwriter named below, for which is acting as representative, has severally agreed to purchase, and the Fund has agreed to sell to such underwriter, the number of common shares set forth opposite the name of such underwriter.

                                                                 NUMBER OF
UNDERWRITER                                                    COMMON SHARES
-----------                                                    -------------
                                                                 ---------
Total.......................................................
                                                                 =========

The purchase agreement provides that the obligations of the underwriters to purchase the common shares included in this offering are subject to approval of legal matters by counsel and to other conditions. The underwriters are obligated to purchase all the common shares (other than those covered by the overallotment option described below) if they purchase any of the common shares. In the purchase agreement, the Fund and Calamos have agreed to indemnify the underwriters against certain liabilities, including liabilities arising under the Securities Act, or to contribute payments the underwriters may be required to make for any of those liabilities.

COMMISSIONS AND DISCOUNTS

The underwriters propose to initially offer some of the common shares directly to the public at the public offering price set forth on the cover page of this prospectus and some of the common shares to certain dealers at the public offering price less a concession not to exceed $ per common share. The sales load the Fund will pay of $.675 per common share is equal to 4.5% of the initial offering price. The underwriters may allow, and such dealers may reallow, a discount not to exceed $ per common share on sales to other dealers. After the initial public offering, the public offering price, concession and discount may be changed. Investors must pay for any common shares purchased on or before , 2004.

The following table shows the public offering price, sales load, estimated offering expenses and proceeds, after expenses, to the Fund. The information assumes either no exercise or full exercise by the underwriters of their overallotment option.

                                                   PER SHARE   WITHOUT OPTION   WITH OPTION
                                                   ---------   --------------   -----------
Public offering price............................   $ 15.00
Sales load.......................................   $  .675
Estimated offering expenses......................   $   .03
Proceeds, after expenses, to the Trust...........   $14.295

The Fund will pay all of its organizational expenses and offering costs (other than sales load) up to and including $.03 per common share. This amount includes the $. per common share reimbursement of expenses to the underwriters and may also include a reimbursement of Calamos' expenses incurred in connection with this offering. The amount paid by the Fund as the partial reimbursement to the underwriters will not exceed . % of the total price to the public of the common shares sold in this offering. Calamos has agreed to pay all of the Fund's organizational expenses and offering costs (other than sales load but including reimbursement of the underwriter expenses of $ per share) that exceed $.03 per common share.

42

OVERALLOTMENT OPTION

The Fund has granted the underwriters an option to purchase up to additional common shares at the public offering price, less the sales load, within 45 days from the date of this prospectus solely to cover any overallotments. If the underwriters exercise this option, each will be obligated, subject to conditions contained in the purchase agreement, to purchase a number of additional common shares proportionate to that underwriter's initial amount reflected in the above table.

PRICE STABILIZATION, SHORT POSITIONS AND PENALTY BIDS

Until the distribution of the common shares is complete, the Commission rules may limit underwriters and selling group members from bidding for and purchasing the common shares. However, the representatives may engage in transactions that stabilize the price of the common shares, such as bids or purchases to peg, fix or maintain the price.

If the underwriters create a short position in the common shares in connection with the offering, i.e., if they sell more common shares than are listed on the cover of this prospectus, the representatives may reduce that short position by purchasing common shares in the open market. The representatives may also elect to reduce any short position by exercising all or part of the overallotment option described above. The underwriters may also impose a penalty bid, whereby selling concessions allowed to syndicate members or other broker-dealers in respect of the common shares sold in this offering for their account may be reclaimed by the syndicate if such common shares are repurchased by the syndicate in stabilizing or covering transactions. Purchases of the common shares to stabilize its price or to reduce a short position may cause the price of the common shares to be higher than it might be in the absence of such purchases.

Neither the Fund nor any of the underwriters makes any representation or prediction as to the direction or magnitude of any effect that the transactions described above may have on the price of the common shares. In addition, neither the Fund nor any of the underwriters make any representation that the representatives will engage in these transactions or that these transactions, once commenced, will not be discontinued without notice.

The Fund has agreed not to offer or sell any additional common shares for a period of 180 days after the date of the purchase agreement without the prior written consent of the underwriters, except for the sale of the common shares to the underwriters pursuant to the purchase agreement and certain transactions related to the Fund's Dividend Reinvestment Plan.

The Fund anticipates that the underwriters may from time to time act as brokers or, after they have ceased to be underwriters, dealers in executing the Fund's portfolio transactions. The underwriters are active underwriters of, and dealers in, securities and act as market makers in a number of such securities, and therefore can be expected to engage in portfolio transactions with the Fund.

One or more of the underwriters of the common shares may also act as an underwriter of the Fund's preferred shares.

The common shares will be sold to ensure that the New York Stock Exchange distribution standards (i.e., round lots, public shares and aggregate market value) will be met.

OTHER RELATIONSHIPS

Calamos (and not the Fund) has agreed to pay from its own assets a fee to certain qualifying underwriters (the "Qualifying Underwriters") payable quarterly at the annual rate of % of the Fund's managed assets during the continuance of the Investment Management Agreement or other advisory agreements between Calamos and the Fund. Each Qualifying Underwriter has agreed to provide as requested certain after-market shareholder support services, including services designed to maintain the visibility of the Fund on an ongoing basis and to provide as requested relevant information, studies or reports regarding the Fund and the closed-end investment company industry and asset management

43

industry. The total amount of these additional compensation payments to Qualifying Underwriters will not exceed % of the total price to the public of the common share sold in this offering.

The sum of the additional compensation fees payable to Qualifying Underwriters, plus the amount paid by the Fund as the $. per common share reimbursement to the underwriters and the amount of certain other underwriter fees, will not exceed 4.5% of the aggregate initial offering price of the common shares offered hereby. The sum total of all compensation to underwriters in connection with this public offering of common shares, including sales load and additional compensation to and reimbursement of underwriters, will be limited to 9.0% of the total price to the public of the common shares sold in this offering.

In connection with the offering, the underwriters or selected dealers may distribute prospectuses electronically.

The principal address of is .

CUSTODIAN, TRANSFER AGENT AND DIVIDEND DISBURSING AGENT

The Fund's securities and cash are held under a custodian agreement with The Bank of New York, One Wall Street, New York, New York 10286. The transfer agent and dividend disbursing agent for the Fund's shares is also The Bank of New York.

LEGAL OPINIONS

Bell, Boyd & Lloyd LLC, Chicago, Illinois, serves as counsel to the Fund and to the non-interested Trustees. Vedder, Price, Kaufman & Kammholz, P.C. ("Vedder Price"), Chicago, Illinois, which is serving as special counsel to the Fund in connection with the offering, will pass on the legality of the shares offered hereby. Vedder Price is also counsel to Calamos. Certain matters will be passed upon for the underwriters by , New York, New York. Vedder Price and may rely on matters of Delaware law on the opinion of Morris, Nichols, Arsht & Tunnell, Wilmington, Delaware.

44

TABLE OF CONTENTS OF

THE STATEMENT OF ADDITIONAL INFORMATION

Use of Proceeds.............................................   S-1
Investment Restrictions.....................................  S-22
Management of the Fund......................................  S-24
Portfolio Transactions......................................  S-32
Repurchase of Common Shares.................................  S-33
U.S. Federal Income Tax Matters.............................  S-34
Experts.....................................................  S-40
Additional Information......................................  S-40
Appendix A -- Description of Ratings........................   A-1

45

Until , 2004 (25 days after the date of this prospectus), all dealers that buy, sell or trade the common shares, whether or not participating in this offering, may be required to deliver a prospectus. This is in addition to the dealers' obligation to deliver a prospectus when acting as underwriters and with respect to their unsold allotments or subscriptions.

SHARES

CALAMOS GLOBAL TOTAL RETURN FUND

COMMON SHARES

$15.00 PER SHARE


PROSPECTUS

SEC FILE NUMBER: 811-
333-

, 2004


The information in this Statement of Additional Information is not complete and may be changed. We may not sell these securities until the Registration Statement filed with the Securities and Exchange Commission is effective. This Statement of Additional Information is not an offer to sell these securities and is not soliciting an offer to buy these securities in any state where the offer or sale is not permitted.

SUBJECT TO COMPLETION, DATED ___________, 2004

CALAMOS GLOBAL TOTAL RETURN FUND

STATEMENT OF ADDITIONAL INFORMATION

Calamos Global Total Return Fund (the "Fund") is a newly organized, diversified, closed-end management investment company. This Statement of Additional Information relating to common shares does not constitute a prospectus, but should be read in conjunction with the Prospectus relating thereto dated ________ __, 2004. This Statement of Additional Information does not include all information that a prospective investor should consider before purchasing common shares, and investors should obtain and read the Prospectus prior to purchasing such shares. A copy of the Prospectus may be obtained without charge by calling 1-800-582-6959. You may also obtain a copy of the Prospectus on the Securities and Exchange Commission's web site (http://www.sec.gov).

Use of Proceeds................................................................................................S-1
Investment Restrictions.......................................................................................S-22
Management of the Fund........................................................................................S-24
Portfolio Transactions........................................................................................S-32
Repurchase of Common Shares...................................................................................S-33
U.S. Federal Income Tax Matters...............................................................................S-34
Experts.......................................................................................................S-40
Additional Information........................................................................................S-40
Appendix A--Description of Ratings.............................................................................A-1

This Statement of Additional Information is dated _______ __, 2004.


USE OF PROCEEDS

The Fund will invest the net proceeds of the offering in accordance with the Fund's investment objective and policies as stated below and in the Prospectus. It is presently anticipated that the Fund will invest substantially all of the net proceeds in securities that meet the investment objective and policies within three months after completion of the offering. Pending such investment, the net proceeds may be invested in U.S. government securities and high grade, short-term money market instruments. If necessary, the Fund may also purchase, as temporary investments, securities of other open- or closed-end investment companies that invest primarily in the types of securities in which the Fund may invest directly.

INVESTMENT OBJECTIVE AND POLICIES

The prospectus presents the investment objective and the principal investment strategies and risks of the Fund. This section supplements the disclosure in the Fund's prospectus and provides additional information on the Fund's investment policies or restrictions. Restrictions or policies stated as a maximum percentage of the Fund's assets are only applied immediately after a portfolio investment to which the policy or restriction is applicable (other than the limitations on borrowing). Accordingly, any later increase or decrease resulting from a change in values, net assets or other circumstances will not be considered in determining whether the investment complies with the Fund's restrictions and policies.

PRIMARY INVESTMENTS. Under normal circumstances, the Fund will invest primarily in a portfolio of equity securities and other income producing securities such as investment grade and below investment grade (high yield/high risk) debt securities. The Fund, under normal circumstances, will invest at least 50% of its managed assets in equity securities (including securities that are convertible into equity securities). The Fund may invest up to 100% of its managed assets in securities of foreign issuers, including debt and equity securities of corporate issuers and debt securities of government issuers, in developed and emerging markets. However, the Fund will invest in securities of at least three countries, which may include the United States. "Managed Assets" means the total assets of the Fund (including any assets attributable to any leverage that may be outstanding) minus the sum of accrued liabilities (other than debt representing financial leverage). For this purpose the liquidation preference on any preferred shares will not constitute a liability.

The Fund will attempt to keep a consistent balance between risk and reward over the course of different market cycles, through various combinations of stocks, bonds, and/or convertible securities, to achieve what the investment adviser believes to be an appropriate blend for the then current market. As the market environment changes, portfolio securities may change in an attempt to achieve a relatively consistent risk level over time. At some points in a market cycle, one type of security may make up a substantial portion of the portion of the portfolio, while at other times certain securities may have minimal or no representation, depending on market conditions.

FOREIGN SECURITIES. The Fund may invest up to 100% of its managed assets in securities of foreign issuers, including debt and equity securities of corporate issuers and debt securities of government issuers, in developed and emerging markets. The Fund will invest in the securities markets of at least three markets, which may include the United States. A foreign issuer is a company organized under the laws of a foreign country that is principally traded in the financial markets of a foreign country. For these purposes, foreign securities do not include American Depositary Receipts ("ADRs") or securities guaranteed by a United States person, but may include foreign securities in the form of European Depositary Receipts ("EDRs"), Global Depositary Receipts ("GDRs") or other securities representing underlying shares of foreign issuers. Positions in those securities are not necessarily denominated in the same currency as the common stocks into which they may be converted. ADRs are receipts typically issued by an American bank or trust company evidencing ownership of the underlying securities. EDRs

S-1

are European receipts listed on the Luxembourg Stock Exchange evidencing a similar arrangement. GDRs are U.S. dollar-denominated receipts evidencing ownership of foreign securities. Generally, ADRs, in registered form, are designed for the U.S. securities markets and EDRs and GDRs, in bearer form, are designed for use in foreign securities markets. The Fund may invest in sponsored or unsponsored ADRs. In the case of an unsponsored ADR, the Fund is likely to bear its proportionate share of the expenses of the depository and it may have greater difficulty in receiving shareholder communications than it would have with a sponsored ADR. To the extent positions in portfolio securities are denominated in foreign currencies, the Fund's investment performance is affected by the strength or weakness of the U.S. dollar against those currencies. For example, if the dollar falls in value relative to the Japanese yen, the dollar value of a Japanese stock held in the portfolio will rise even though the price of the stock remains unchanged. Conversely, if the dollar rises in value relative to the yen, the dollar value of the Japanese stock will fall. (See discussion of transaction hedging and portfolio hedging below under "Currency Exchange Transactions.")

Investors should understand and consider carefully the risks involved in foreign investing. Investing in foreign securities, which are generally denominated in foreign currencies, and utilization of forward foreign currency exchange contracts involve certain considerations comprising both risks and opportunities not typically associated with investing in U.S. securities. These considerations include: fluctuations in exchange rates of foreign currencies; possible imposition of exchange control regulation or currency restrictions that would prevent cash from being brought back to the United States less public information with respect to issuers of securities; less governmental supervision of stock exchanges, securities brokers, and issuers of securities; lack of uniform accounting, auditing and financial reporting standards; lack of uniform settlement periods and trading practices; less liquidity and frequently greater price volatility in foreign markets than in the United States; possible imposition of foreign taxes; and sometimes less advantageous legal, operational and financial protections applicable to foreign sub-custodial arrangements.

Although the Fund intends to invest in companies and government securities of countries having stable political environments, there is the possibility of expropriation or confiscatory taxation, seizure or nationalization of foreign bank deposits or other assets, establishment of exchange controls, the adoption of foreign government restrictions, or other adverse political, social or diplomatic developments that could affect investment in these nations.

The Fund may invest in the securities of emerging countries. The securities markets of emerging countries are substantially smaller, less developed, less liquid and more volatile than the securities markets of the U.S. and other more developed countries. Disclosure and regulatory standards in many respects are less stringent than in the U.S. and other major markets. There also may be a lower level of monitoring and regulation of emerging markets and the activities of investors in such markets, and enforcement of existing regulations has been extremely limited. Economies in individual emerging markets may differ favorably or unfavorably from the U.S. economy in such respects as growth of gross domestic product, rates of inflation, currency depreciation, capital reinvestment, resource self-sufficiency and balance of payments positions. Many emerging market countries have experienced high rates of inflation for many years, which has had and may continue to have very negative effects on the economies and securities markets of those countries.

CURRENCY EXCHANGE TRANSACTIONS. Currency exchange transactions may be conducted either on a spot (i.e., cash) basis at the spot rate for purchasing or selling currency prevailing in the foreign exchange market or through forward currency exchange contracts ("forward contracts"). Forward contracts are contractual agreements to purchase or sell a specified currency at a specified future date (or within a specified time period) and price set at the time of the contract. Forward contracts are usually

S-2

entered into with banks, foreign exchange dealers and broker-dealers, are not exchange traded, and are usually for less than one year, but may be renewed.

Forward currency exchange transactions may involve currencies of the different countries in which the Fund may invest and serve as hedges against possible variations in the exchange rate between these currencies. Currency exchange transactions are limited to transaction hedging and portfolio hedging involving either specific transactions or portfolio positions, except to the extent described below under "Synthetic Foreign Money Market Positions." Transaction hedging is the purchase or sale of forward contracts with respect to specific receivables or payables of the Fund accruing in connection with the purchase and sale of its portfolio securities or the receipt of dividends or interest thereon. Portfolio hedging is the use of forward contracts with respect to portfolio security positions denominated or quoted in a particular foreign currency. Portfolio hedging allows the Fund to limit or reduce its exposure in a foreign currency by entering into a forward contract to sell such foreign currency (or another foreign currency that acts as a proxy for that currency) at a future date for a price payable in U.S. dollars so that the value of the foreign denominated portfolio securities can be approximately matched by a foreign denominated liability. The Fund may not engage in portfolio hedging with respect to the currency of a particular country to an extent greater than the aggregate market value (at the time of making such sale) of the securities held in its portfolio denominated or quoted in that particular currency, except that the Fund may hedge all or part of its foreign currency exposure through the use of a basket of currencies or a proxy currency where such currencies or currency act as an effective proxy for other currencies. In such a case, the Fund may enter into a forward contract where the amount of the foreign currency to be sold exceeds the value of the securities denominated in such currency. The use of this basket hedging technique may be more efficient and economical than entering into separate forward contracts for each currency held in the Fund. The Fund may not engage in "speculative" currency exchange transactions.

If the Fund enters into a forward contract, the Fund's custodian will segregate liquid assets of the Fund having a value equal to the Fund's commitment under such forward contract. At the maturity of the forward contract to deliver a particular currency, the Fund may either sell the portfolio security related to the contract and make delivery of the currency, or it may retain the security and either acquire the currency on the spot market or terminate its contractual obligation to deliver the currency by purchasing an offsetting contract with the same currency trader obligating it to purchase on the same maturity date the same amount of the currency. It is impossible to forecast with absolute precision the market value of portfolio securities at the expiration of a forward contract. Accordingly, it may be necessary for a Fund to purchase additional currency on the spot market (and bear the expense of such purchase) if the market value of the security is less than the amount of currency the Fund is obligated to deliver and if a decision is made to sell the security and make delivery of the currency. Conversely, it may be necessary to sell on the spot market some of the currency received upon the sale of the portfolio security if its market value exceeds the amount of currency the Fund is obligated to deliver.

If the Fund retains the portfolio security and engages in an offsetting transaction, the Fund will incur a gain or a loss to the extent that there has been movement in forward contract prices. If the Fund engages in an offsetting transaction, it may subsequently enter into a new forward contract to sell the currency. Should forward prices decline during the period between the Fund's entering into a forward contract for the sale of a currency and the date it enters into an offsetting contract for the purchase of the currency, the Fund will realize a gain to the extent the price of the currency it has agreed to sell exceeds the price of the currency it has agreed to purchase. Should forward prices increase, the Fund will suffer a loss to the extent the price of the currency it has agreed to purchase exceeds the price of the currency it has agreed to sell. A default on the contract would deprive the Fund of unrealized profits or force the Fund to cover its commitments for purchase or sale of currency, if any, at the current market price.

S-3

Hedging against a decline in the value of a currency does not eliminate fluctuations in the value of a portfolio security traded in that currency or prevent a loss if the value of the security declines. Hedging transactions also preclude the opportunity for gain if the value of the hedged currency should rise. Moreover, it may not be possible for a Fund to hedge against a devaluation that is so generally anticipated that the Fund is not able to contract to sell the currency at a price above the devaluation level it anticipates. The cost to the Fund of engaging in currency exchange transactions varies with such factors as the currency involved, the length of the contract period, and prevailing market conditions. Because currency exchange transactions are usually conducted on a principal basis, no fees or commissions are involved.

EQUITY SECURITIES. Equity securities include common and preferred stocks, warrants, rights, and depository receipts. Under normal circumstances, the Fund will invest at least 50% of its managed assets in equity securities (including securities that are convertible into equity securities). An investment in the equity securities of a company represents a proportionate ownership interest in that company. Therefore, the Fund participates in the financial success or failure of any company in which it has an equity interest. Equity investments are subject to greater fluctuations in market value than other asset classes as a result of such factors as a company's business performance, investor perceptions, stock market trends and general economic conditions. Equity securities are subordinated to bonds and other debt instruments in a company's capital structure in terms of priority to corporate income and liquidation payments.

Preferred stocks involve credit risk, which is the risk that a preferred stock in the Fund's portfolio will decline in price or fail to make dividend payments when due because the issuer of the security experiences a decline in its financial status. In addition to credit risk, investments in preferred stocks involve certain other risks. Certain preferred stocks contain provisions that allow an issuer under certain circumstances to skip distributions (in the case of "non-cumulative" preferred stocks) or defer distributions (in the case of "cumulative" preferred stocks). If the Fund owns a preferred stock that is deferring its distributions, the Fund may be required to report income for tax purposes while it is not receiving income from that stock. In certain varying circumstances, an issuer may redeem its preferred stock prior to a specified date in the event of certain tax or legal changes or at the issuer's call. In the event of a redemption, the Fund may not be able to reinvest the proceeds at comparable rates of return. Preferred stocks typically do not provide any voting rights, except in cases when dividends are in arrears for a specified number of periods.

Equity securities of small company and mid cap companies historically have been subject to greater investment risk than those of large companies. The risks generally associated with small and medium-sized companies include more limited product lines, markets and financial resources, lack of management depth or experience, dependency on key personnel and vulnerability to adverse market and economic developments. Accordingly, the prices of small and medium-sized company equity securities tend to be more volatile than prices of large company stocks. Further, the prices of small and medium-sized company equity securities are often adversely affected by limited trading volumes and the lack of publicly available information.

HIGH YIELD SECURITIES. The high yield securities in which the Fund invests are rated below investment grade (i.e. rated Ba or lower by Moody's or BB or lower by Standard & Poor's) or are unrated but determined by Calamos to be of comparable quality. Non-convertible debt securities rated below investment grade are commonly referred to as "junk bonds" and are considered speculative with respect to the issuer's capacity to pay interest and repay principal.

INVESTMENT IN HIGH YIELD SECURITIES INVOLVES SUBSTANTIAL RISK OF LOSS. Below investment grade non-convertible debt securities or comparable unrated securities are commonly referred to as "junk bonds" and are considered predominantly speculative with respect to the issuer's ability to pay interest

S-4

and principal and are susceptible to default or decline in market value due to adverse economic and business developments. The market values for high yield securities tend to be very volatile, and these securities are less liquid than investment grade debt securities. For these reasons, your investment in the Fund is subject to the following specific risks:

- increased price sensitivity to changing interest rates and to a deteriorating economic environment;

- greater risk of loss due to default or declining credit quality;

- adverse company specific events are more likely to render the issuer unable to make interest and/or principal payments; and

- if a negative perception of the high yield market develops, the price and liquidity of high yield securities may be depressed. This negative perception could last for a significant period of time.

Securities rated below investment grade are speculative with respect to the capacity to pay interest and repay principal in accordance with the terms of such securities. A rating of C from Moody's means that the issue so rated can be regarded as having extremely poor prospects of ever attaining any real investment standing. Standard & Poor's assigns a rating of C to issues that are currently highly vulnerable to nonpayment, and the C rating may be used to cover a situation where a bankruptcy petition has been filed or similar action taken, but payments on the obligation are being continued (a C rating is also assigned to a preferred stock issue in arrears on dividends or sinking fund payments, but that is currently paying). See Appendix A to this statement of additional information for a description of Moody's and Standard & Poor's ratings.

Adverse changes in economic conditions are more likely to lead to a weakened capacity of a high yield issuer to make principal payments and interest payments than an investment grade issuer. The principal amount of high yield securities outstanding has proliferated in the past decade as an increasing number of issuers have used high yield securities for corporate financing. An economic downturn could severely affect the ability of highly leveraged issuers to service their debt obligations or to repay their obligations upon maturity. Similarly, down-turns in profitability in specific industries could adversely affect the ability of high yield issuers in that industry to meet their obligations. The market values of lower quality debt securities tend to reflect individual developments of the issuer to a greater extent than do higher quality securities, which react primarily to fluctuations in the general level of interest rates. Factors having an adverse impact on the market value of lower quality securities may have an adverse effect on the Fund's net asset value and the market value of its common shares. In addition, the Fund may incur additional expenses to the extent it is required to seek recovery upon a default in payment of principal or interest on its portfolio holdings. In certain circumstances, the Fund may be required to foreclose on an issuer's assets and take possession of its property or operations. In such circumstances, the Fund would incur additional costs in disposing of such assets and potential liabilities from operating any business acquired.

The secondary market for high yield securities may not be as liquid as the secondary market for more highly rated securities, a factor which may have an adverse effect on the Fund's ability to dispose of a particular security when necessary to meet its liquidity needs. There are fewer dealers in the market for high yield securities than investment grade obligations. The prices quoted by different dealers may vary significantly and the spread between the bid and asked price is generally much larger than higher quality instruments. Under adverse market or economic conditions, the secondary market for high yield securities could contract further, independent of any specific adverse changes in the condition of a particular issuer, and these instruments may become illiquid. As a result, the Fund could find it more

S-5

difficult to sell these securities or may be able to sell the securities only at prices lower than if such securities were widely traded. Prices realized upon the sale of such lower rated or unrated securities, under these circumstances, may be less than the prices used in calculating the Fund's net asset value.

Since investors generally perceive that there are greater risks associated with lower quality debt securities of the type in which the Fund may invest a portion of its assets, the yields and prices of such securities may tend to fluctuate more than those for higher rated securities. In the lower quality segments of the debt securities market, changes in perceptions of issuers' creditworthiness tend to occur more frequently and in a more pronounced manner than do changes in higher quality segments of the debt securities market, resulting in greater yield and price volatility.

If the Fund invests in high yield securities that are rated C or below, the Fund will incur significant risk in addition to the risks associated with investments in high yield securities and corporate loans. Distressed securities frequently do not produce income while they are outstanding. The Fund may purchase distressed securities that are in default or the issuers of which are in bankruptcy. The Fund may be required to bear certain extraordinary expenses in order to protect and recover its investment.

DISTRESSED SECURITIES. The Fund may, but currently does not intend to, invest up to 5% of its total assets in distressed securities, including corporate loans, which are the subject of bankruptcy proceedings or otherwise in default as to the repayment of principal and/or payment of interest at the time of acquisition by the Fund or are rated in the lower rating categories (Ca or lower by Moody's or CC or lower by Standard & Poor's) or which are unrated investments considered by Calamos to be of comparable quality. Investment in distressed securities is speculative and involves significant risk. Distressed securities frequently do not produce income while they are outstanding and may require the Fund to bear certain extraordinary expenses in order to protect and recover its investment. Therefore, to the extent the Fund seeks capital appreciation through investment in distressed securities, the Fund's ability to achieve current income for its shareholders may be diminished. The Fund also will be subject to significant uncertainty as to when and in what manner and for what value the obligations evidenced by the distressed securities will eventually be satisfied (e.g., through a liquidation of the obligor's assets, an exchange offer or plan of reorganization involving the distressed securities or a payment of some amount in satisfaction of the obligation). In addition, even if an exchange offer is made or a plan of reorganization is adopted with respect to distressed securities held by the Fund, there can be no assurance that the securities or other assets received by the Fund in connection with such exchange offer or plan of reorganization will not have a lower value or income potential than may have been anticipated when the investment was made. Moreover, any securities received by the Fund upon completion of an exchange offer or plan of reorganization may be restricted as to resale. As a result of the Fund's participation in negotiations with respect to any exchange offer or plan of reorganization with respect to an issuer of distressed securities, the Fund may be restricted from disposing of such securities.

LOANS. The Fund may invest up to 5% of its total assets in loan participations and other direct claims against a borrower. The corporate loans in which the Fund invests primarily consist of direct obligations of a borrower and may include debtor in possession financings pursuant to Chapter 11 of the U.S. Bankruptcy Code, obligations of a borrower issued in connection with a restructuring pursuant to Chapter 11 of the U.S. Bankruptcy Code, leveraged buy-out loans, leveraged recapitalization loans, receivables purchase facilities, and privately placed notes. The Fund may invest in a corporate loan at origination as a co-lender or by acquiring in the secondary market participations in, assignments of or novations of a corporate loan. By purchasing a participation, the Fund acquires some or all of the interest of a bank or other lending institution in a loan to a corporate or government borrower. The participations typically will result in the Fund having a contractual relationship only with the lender not the borrower. The Fund will have the right to receive payments of principal, interest and any fees to which it is entitled only from the lender selling the participation and only upon receipt by the lender of the payments from

S-6

the borrower. Many such loans are secured, although some may be unsecured. Such loans may be in default at the time of purchase. Loans that are fully secured offer the Fund more protection than an unsecured loan in the event of non-payment of scheduled interest or principal. However, there is no assurance that the liquidation of collateral from a secured loan would satisfy the corporate borrower's obligation, or that the collateral can be liquidated. Direct debt instruments may involve a risk of loss in case of default or insolvency of the borrower and may offer less legal protection to the Fund in the event of fraud or misrepresentation. In addition, loan participations involve a risk of insolvency of the lending bank or other financial intermediary. The markets in loans are not regulated by federal securities laws or the Securities and Exchange Commission (the "Commission").

As in the case of other high yield investments, such corporate loans may be rated in the lower rating categories of the established rating services (Ba or lower by Moody's or BB or lower by Standard & Poor's), or may be unrated investments considered by Calamos to be of comparable quality. As in the case of other high yield investments, such corporate loans can be expected to provide higher yields than lower yielding, higher rated fixed income securities, but may be subject to greater risk of loss of principal and income. There are, however, some significant differences between corporate loans and high yield bonds. Corporate loan obligations are frequently secured by pledges of liens and security interests in the assets of the borrower, and the holders of corporate loans are frequently the beneficiaries of debt service subordination provisions imposed on the borrower's bondholders. These arrangements are designed to give corporate loan investors preferential treatment over high yield investors in the event of a deterioration in the credit quality of the issuer. Even when these arrangements exist, however, there can be no assurance that the borrowers of the corporate loans will repay principal and/or pay interest in full. Corporate loans generally bear interest at rates set at a margin above a generally recognized base lending rate that may fluctuate on a day-to-day basis, in the case of the prime rate of a U.S. bank, or which may be adjusted on set dates, typically 30 days but generally not more than one year, in the case of the London Interbank Offered Rate. Consequently, the value of corporate loans held by the Fund may be expected to fluctuate significantly less than the value of other fixed rate high yield instruments as a result of changes in the interest rate environment. On the other hand, the secondary dealer market for certain corporate loans may not be as well developed as the secondary dealer market for high yield bonds, and therefore presents increased market risk relating to liquidity and pricing concerns.

SYNTHETIC FOREIGN MONEY MARKET POSITIONS. The Fund may invest in money market instruments denominated in foreign currencies. In addition to, or in lieu of, such direct investment, the Fund may construct a synthetic foreign money market position by (a) purchasing a money market instrument denominated in one currency, generally U.S. dollars, and (b) concurrently entering into a forward contract to deliver a corresponding amount of that currency in exchange for a different currency on a future date and at a specified rate of exchange. For example, a synthetic money market position in Japanese yen could be constructed by purchasing a U.S. dollar money market instrument, and entering concurrently into a forward contract to deliver a corresponding amount of U.S. dollars in exchange for Japanese yen on a specified date and at a specified rate of exchange. Because of the availability of a variety of highly liquid short-term U.S. dollar money market instruments, a synthetic money market position utilizing such U.S. dollar instruments may offer greater liquidity than direct investment in foreign currency and a concurrent construction of a synthetic position in such foreign currency, in terms of both income yield and gain or loss from changes in currency exchange rates, in general should be similar, but would not be identical because the components of the alternative investments would not be identical.

DEBT OBLIGATIONS OF NON-U.S. GOVERNMENTS. An investment in debt obligations of non-U.S. governments and their political subdivisions (sovereign debt) involves special risks that are not present in corporate debt obligations. The non-U.S. issuer of the sovereign debt or the non-U.S. governmental authorities that control the repayment of the debt may be unable or unwilling to repay principal or interest

S-7

when due, and the Fund may have limited recourse in the event of a default. During periods of economic uncertainty, the market prices of sovereign debt may be more volatile than prices of debt obligations of U.S. issuers. In the past, certain non-U.S. countries have encountered difficulties in servicing their debt obligations, withheld payments of principal and interest and declared moratoria on the payment of principal and interest on their sovereign debt.

A sovereign debtor's willingness or ability to repay principal and pay interest in a timely manner may be affected by, among other factors, its cash flow situation, the extent of its foreign currency reserves, the availability of sufficient non-U.S. currency, the relative size of the debt service burden, the sovereign debtor's policy toward its principal international lenders and local political constraints.

Sovereign debtors may also be dependent on expected disbursements from non-U.S. governments, multilateral agencies and other entities to reduce principal and interest arrearages on their debt. The failure of a sovereign debtor to implement economic reforms, achieve specified levels of economic performance or repay principal or interest when due may result in the cancellation of third-party commitments to lend funds to the sovereign debtor, which may further impair such debtor's ability or willingness to service its debts.

EURODOLLAR INSTRUMENTS AND SAMURAI AND YANKEE BONDS. The Fund may invest in Eurodollar instruments and Samurai and Yankee bonds. Eurodollar instruments are bonds of corporate and government issuers that pay interest and principal in U.S. dollars but are issued in markets outside the United States, primarily in Europe. Samurai bonds are yen-denominated bonds sold in Japan by non-Japanese issuers. Yankee bonds are U.S. dollar-denominated bonds typically issued in the U.S. by non-U.S. governments and their agencies and non-U.S. banks and corporations. The Fund may also invest in Eurodollar Certificates of Deposit ("ECDs"), Eurodollar Time Deposits ("ETDs") and Yankee Certificates of Deposit ("Yankee CDs"). ECDs are U.S. dollar-denominated certificates of deposit issued by non-U.S. branches of domestic banks; ETDs are U.S. dollar-denominated deposits in a non-U.S. branch of a U.S. bank or in a non-U.S. bank; and Yankee CDs are U.S. dollar-denominated certificates of deposit issued by a U.S. branch of a non-U.S. bank and held in the U.S. These investments involve risks that are different from investments in securities issued by U.S. issuers, including potential unfavorable political and economic developments, non-U.S. withholding or other taxes, seizure of non-U.S. deposits, currency controls, interest limitations or other governmental restrictions which might affect payment of principal or interest.

CONVERTIBLE SECURITIES. Convertible securities include any corporate debt security or preferred stock that may be converted into underlying shares of common stock. The common stock underlying convertible securities may be issued by a different entity than the issuer of the convertible securities. Convertible securities entitle the holder to receive interest payments paid on corporate debt securities or the dividend preference on a preferred stock until such time as the convertible security matures or is redeemed or until the holder elects to exercise the conversion privilege. As a result of the conversion feature, however, the interest rate or dividend preference on a convertible security is generally less than would be the case if the securities were issued in non-convertible form.

The value of convertible securities is influenced by both the yield of non-convertible securities of comparable issuers and by the value of the underlying common stock. The value of a convertible security viewed without regard to its conversion feature (i.e., strictly on the basis of its yield) is sometimes referred to as its "investment value." The investment value of the convertible security typically will fluctuate inversely with changes in prevailing interest rates. However, at the same time, the convertible security will be influenced by its "conversion value," which is the market value of the underlying common stock that would be obtained if the convertible security were converted. Conversion value fluctuates directly with the price of the underlying common stock.

S-8

If, because of a low price of the common stock, the conversion value is substantially below the investment value of the convertible security, the price of the convertible security is governed principally by its investment value. If the conversion value of a convertible security increases to a point that approximates or exceeds its investment value, the value of the security will be principally influenced by its conversion value. A convertible security will sell at a premium over its conversion value to the extent investors place value on the right to acquire the underlying common stock while holding a fixed income security. Holders of convertible securities have a claim on the assets of the issuer prior to the common stockholders, but may be subordinated to holders of similar non-convertible securities of the same issuer.

SYNTHETIC CONVERTIBLE SECURITIES. Calamos may create a "synthetic" convertible security by combining fixed income securities with the right to acquire equity securities. More flexibility is possible in the assembly of a synthetic convertible security than in the purchase of a convertible security. Although synthetic convertible securities may be selected where the two components are issued by a single issuer, thus making the synthetic convertible security similar to the true convertible security, the character of a synthetic convertible security allows the combination of components representing distinct issuers, when Calamos believes that such a combination would better promote the Fund's investment objective. A synthetic convertible security also is a more flexible investment in that its two components may be purchased separately. For example, the Fund may purchase a warrant for inclusion in a synthetic convertible security but temporarily hold short-term investments while postponing the purchase of a corresponding bond pending development of more favorable market conditions.

A holder of a synthetic convertible security faces the risk of a decline in the price of the security or the level of the index involved in the convertible component, causing a decline in the value of the call option or warrant purchased to create the synthetic convertible security. Should the price of the stock fall below the exercise price and remain there throughout the exercise period, the entire amount paid for the call option or warrant would be lost. Because a synthetic convertible security includes the fixed-income component as well, the holder of a synthetic convertible security also faces the risk that interest rates will rise, causing a decline in the value of the fixed-income instrument.

The Fund may also purchase synthetic convertible securities manufactured by other parties, including convertible structured notes. Convertible structured notes are fixed income debentures linked to equity, and are typically issued by investment banks. Convertible structured notes have the attributes of a convertible security, however, the investment bank that issued the convertible note assumes the credit risk associated with the investment, rather than the issuer of the underlying common stock into which the note is convertible.

LENDING OF PORTFOLIO SECURITIES. The Fund may lend its portfolio securities to broker-dealers and banks. Any such loan must be continuously secured by collateral in cash or cash equivalents maintained on a current basis in an amount at least equal to the market value of the securities loaned by the Fund. The Fund would continue to receive the equivalent of the interest or dividends paid by the issuer on the securities loaned, and would also receive an additional return that may be in the form of a fixed fee or a percentage of the collateral. The Fund may pay reasonable fees to persons unaffiliated with the Fund for services in arranging these loans. The Fund would have the right to call the loan and obtain the securities loaned at any time on notice of not more than five business days. The Fund would not have the right to vote the securities during the existence of the loan but would call the loan to permit voting of the securities, if, in Calamos' judgment, a material event requiring a shareholder vote would otherwise occur before the loan was repaid. In the event of bankruptcy or other default of the borrower, the Fund could experience both delays in liquidating the loan collateral or recovering the loaned securities and losses, including (a) possible decline in the value of the collateral or in the value of the securities loaned

S-9

during the period while the Fund seeks to enforce its rights thereto, (b) possible subnormal levels of income and lack of access to income during this period, and (c) expenses of enforcing its rights.

OPTIONS ON SECURITIES, INDEXES AND CURRENCIES. The Fund may purchase and sell put options and call options on securities, indexes or foreign currencies. The Fund may purchase agreements, sometimes called cash puts, that may accompany the purchase of a new issue of bonds from a dealer.

A put option gives the purchaser of the option, upon payment of a premium, the right to sell, and the writer the obligation to buy, the underlying security, commodity, index, currency or other instrument at the exercise price. For instance, the Fund's purchase of a put option on a security might be designed to protect its holdings in the underlying instrument (or, in some cases, a similar instrument) against a substantial decline in the market value by giving the Fund the right to sell such instrument at the option exercise price. A call option, upon payment of a premium, gives the purchaser of the option the right to buy, and the seller the obligation to sell, the underlying instrument at the exercise price. The Fund's purchase of a call option on a security, financial future, index, currency or other instrument might be intended to protect a fund against an increase in the price of the underlying instrument that it intends to purchase in the future by fixing the price at which it may purchase such instrument.

The Fund is authorized to purchase and sell exchange listed options and over-the-counter options ("OTC options"). Exchange listed options are issued by a regulated intermediary such as the Options Clearing Corporation ("OCC"), which guarantees the performance of the obligations of the parties to such options. The discussion below uses the OCC as an example, but is also applicable to other financial intermediaries.

With certain exceptions, OCC issued and exchange listed options generally settle by physical delivery of the underlying security or currency, although in the future cash settlement may become available. Index options and Eurodollar instruments are cash settled for the net amount, if any, by which the option is "in-the-money" (i.e., where the value of the underlying instrument exceeds, in the case of a call option, or is less than, in the case of a put option, the exercise price of the option) at the time the option is exercised. Frequently, rather than taking or making delivery of the underlying instrument through the process of exercising the option, listed options are closed by entering into offsetting purchase or sale transactions that do not result in ownership of the new option.

OTC options are purchased from or sold to securities dealers, financial institutions or other parties ("Counterparties") through direct bilateral agreement with the Counterparty. In contrast to exchange listed options, which generally have standardized terms and performance mechanics, all the terms of an OTC option, including such terms as method of settlement, term, exercise price, premium, guarantees and security, are set by negotiation of the parties. The Fund may sell OTC options (other than OTC currency options) that are subject to a buy-back provision permitting the Fund to require the Counterparty to sell the option back to a fund at a formula price within seven days. The Fund expects generally to enter into OTC options that have cash settlement provisions, although it is not required to do so. The staff of the Commission currently takes the position that OTC options purchased by a fund, and portfolio securities "covering" the amount of a fund's obligation pursuant to an OTC option sold by it (or the amount of assets equal to the formula price for the repurchase of the option, if any, less the amount by which the option is in the money) are illiquid.

The Fund may also purchase and sell options on securities indices and other financial indices. Options on securities indices and other financial indices are similar to options on a security or other instrument except that, rather than settling by physical delivery of the underlying instrument, they settle by cash settlement, i.e., an option or an index gives the holder the right to receive, upon exercise of the option, an amount of cash if the closing level of the index upon which the option is based exceeds, in the

S-10

case of a call, or is less than, in the case of a put, the exercise price of the option (except if, in the case of an OTC option, physical delivery is specified). This amount of cash is equal to the excess of the closing price of the index over the exercise price of the option, which also may be multiplied by a formula value. The seller of the option is obligated, in return for the premium received, to make delivery of this amount. The gain or loss on an option on an index depends on price movements in the instruments making upon the market, market segment, industry or other composite on which the underlying index is based, rather than price movements in individual securities, as is the case with respect to options on securities.

The Fund will write call options and put options only if they are "covered." For example, a call option written by the Fund will require the Fund to hold the securities subject to the call (or securities convertible into the needed securities without additional consideration) or to segregate cash or liquid assets sufficient to purchase and deliver the securities if the call is exercised. A call option sold by a fund on an index will require the Fund to own portfolio securities which correlate with the index or to segregate cash or liquid assets equal to the excess of the index value over the exercise price on a current basis. A put option written by the Fund requires the Fund to segregate cash or liquid assets equal to the exercise price.

OTC options entered into by the Fund and OCC issued and exchange listed index options will generally provide for cash settlement. As a result, when the Fund sells these instruments it will only segregate an amount of cash or liquid assets equal to its accrued net obligations, as there is no requirement for payment or delivery of amounts in excess of the net amount. These amounts will equal 100% of the exercise price in the case of a non cash-settled put, the same as an OCC guaranteed listed option sold by the Fund, or the in-the-money amount plus any sell-back formula amount in the case of a cash-settled put or call. In addition, when the Fund sells a call option on an index at a time when the in-the-money amount exceeds the exercise price, the Fund will segregate, until the option expires or is closed out, cash or cash equivalents equal in value to such excess. OCC issued and exchange listed options sold by the Fund other than those above generally settle with physical delivery, or with an election of either physical delivery or cash settlement and the Fund will segregate an amount of cash or liquid assets equal to the full value of the option. OTC options settling with physical delivery, or with an election of either physical delivery or cash settlement, will be treated the same as other options settling with physical delivery.

If an option written by the Fund expires, the Fund realizes a capital gain equal to the premium received at the time the option was written. If an option purchased by the Fund expires, the Fund realizes a capital loss equal to the premium paid.

The Fund will realize a capital gain from a closing purchase transaction if the cost of the closing option is less than the premium received from writing the option, or, if it is more, the Fund will realize a capital loss. If the premium received from a closing sale transaction is more than the premium paid to purchase the option, the Fund will realize a capital gain or, if it is less, the Fund will realize a capital loss. The principal factors affecting the market value of a put or a call option include supply and demand, interest rates, the current market price of the underlying security or index in relation to the exercise price of the option, the volatility of the underlying security or index, and the time remaining until the expiration date.

A put or call option purchased by the Fund is an asset of the Fund, valued initially at the premium paid for the option. The premium received for an option written by the Fund is recorded as a deferred credit. The value of an option purchased or written is marked-to-market daily and is valued at the closing price on the exchange on which it is traded or, if not traded on an exchange or no closing price is available, at the mean between the last bid and asked prices.

S-11

RISKS ASSOCIATED WITH OPTIONS. There are several risks associated with transactions in options. For example, there are significant differences between the securities markets, the currency markets and the options markets that could result in an imperfect correlation among these markets, causing a given transaction not to achieve its objectives. A decision as to whether, when and how to use options involves the exercise of skill and judgment, and even a well-conceived transaction may be unsuccessful to some degree because of market behavior or unexpected events. The ability of the Fund to utilize options successfully will depend on Calamos' ability to predict pertinent market investments, which cannot be assured.

The Fund's ability to close out its position as a purchaser or seller of an OCC or exchange listed put or call option is dependent, in part, upon the liquidity of the option market. Among the possible reasons for the absence of a liquid option market on an exchange are: (i) insufficient trading interest in certain options; (ii) restrictions on transactions imposed by an exchange; (iii) trading halts, suspensions or other restrictions imposed with respect to particular classes or series of options or underlying securities including reaching daily price limits; (iv) interruption of the normal operations of the OCC or an exchange; (v) inadequacy of the facilities of an exchange or OCC to handle current trading volume; or (vi) a decision by one or more exchanges to discontinue the trading of options (or a particular class or series of options), in which event the relevant market for that option on that exchange would cease to exist, although outstanding options on that exchange would generally continue to be exercisable in accordance with their terms. If the Fund were unable to close out an option that it has purchased on a security, it would have to exercise the option in order to realize any profit or the option would expire and become worthless. If the Fund were unable to close out a covered call option that it had written on a security, it would not be able to sell the underlying security until the option expired. As the writer of a covered call option on a security, the Fund foregoes, during the option's life, the opportunity to profit from increases in the market value of the security covering the call option above the sum of the premium and the exercise price of the call. As the writer of a covered call option on a foreign currency, the Fund foregoes, during the option's life, the opportunity to profit from currency appreciation.

The hours of trading for listed options may not coincide with the hours during which the underlying financial instruments are traded. To the extent that the option markets close before the markets for the underlying financial instruments, significant price and rate movements can take place in the underlying markets that cannot be reflected in the option markets.

Unless the parties provide for it, there is no central clearing or guaranty function in an OTC option. As a result, if the Counterparty (as described above under "Options on Securities, Indexes and Currencies") fails to make or take delivery of the security, currency or other instrument underlying an OTC option it has entered into with a fund or fails to make a cash settlement payment due in accordance with the terms of that option, a fund will lose any premium it paid for the option as well as any anticipated benefit of the transaction. Accordingly, Calamos must assess the creditworthiness of each such Counterparty or any guarantor or credit enhancement of the Counterparty's credit to determine the likelihood that the terms of the OTC option will be satisfied. The Fund will engage in OTC option transactions only with U.S. government securities dealers recognized by the Federal Reserve Bank of New York as "primary dealers" or broker/dealers, domestic or foreign banks or other financial institutions which have received (or the guarantors of the obligation of which have received) a short-term credit rating of A-1 from S&P or P-1 from Moody's or an equivalent rating from any nationally recognized statistical rating organization ("NRSRO") or, in the case of OTC currency transactions, are determined to be of equivalent credit quality by Calamos.

The Fund may purchase and sell call options on securities indices and currencies. All calls sold by the Fund must be "covered." Even though the Fund will receive the option premium to help protect it against loss, a call sold by the Fund exposes the Fund during the term of the option to possible loss of

S-12

opportunity to realize appreciation in the market price of the underlying security or instrument and may require a fund to hold a security or instrument which it might otherwise have sold. The Fund may purchase and sell put options on securities indices and currencies. In selling put options, there is a risk that the Fund may be required to buy the underlying security at a disadvantageous price above the market price.

FUTURES CONTRACTS AND OPTIONS ON FUTURES CONTRACTS. The Fund may use interest rate futures contracts, index futures contracts and foreign currency futures contracts. An interest rate, index or foreign currency futures contract provides for the future sale by one party and purchase by another party of a specified quantity of a financial instrument or the cash value of an index(1) at a specified price and time. A public market exists in futures contracts covering a number of indexes (including, but not limited to: the Standard & Poor's 500 Index, the Russell 2000 Index, the Value Line Composite Index, and the New York Stock Exchange Composite Index) as well as financial instruments (including, but not limited to: U.S. Treasury bonds, U.S. Treasury notes, Eurodollar certificates of deposit and foreign currencies). Other index and financial instrument futures contracts are available and it is expected that additional futures contracts will be developed and traded.

The Fund may purchase and write call and put futures options. Futures options possess many of the same characteristics as options on securities, indexes and foreign currencies (discussed above). A futures option gives the holder the right, in return for the premium paid, to assume a long position
(call) or short position (put) in a futures contract at a specified exercise price at any time during the period of the option. Upon exercise of a call option, the holder acquires a long position in the futures contract and the writer is assigned the opposite short position. In the case of a put option, the opposite is true. The Fund might, for example, use futures contracts to hedge against or gain exposure to fluctuations in the general level of stock prices, anticipated changes in interest rates or currency fluctuations that might adversely affect either the value of the Fund's securities or the price of the securities that the Fund intends to purchase. Although other techniques could be used to reduce or increase the Fund's exposure to stock price, interest rate and currency fluctuations, the Fund may be able to achieve its desired exposure more effectively and perhaps at a lower cost by using futures contracts and futures options.

The Fund will only enter into futures contracts and futures options that are standardized and traded on an exchange, board of trade or similar entity, or quoted on an automated quotation system.

The success of any futures transaction depends on the investment manager correctly predicting changes in the level and direction of stock prices, interest rates, currency exchange rates and other factors. Should those predictions be incorrect, the Fund's return might have been better had the transaction not been attempted; however, in the absence of the ability to use futures contracts, the investment manager might have taken portfolio actions in anticipation of the same market movements with similar investment results, but, presumably, at greater transaction costs. When a purchase or sale of a futures contract is made by the Fund, the Fund is required to deposit with its custodian (or broker, if legally permitted) a specified amount of cash or U.S. Government securities or other securities acceptable to the broker ("initial margin"). The margin required for a futures contract is set by the exchange on which the contract is traded and may be modified during the term of the contract, although the Fund's broker may require


(1) A futures contract on an index is an agreement pursuant to which two parties agree to take or make delivery of an amount of cash equal to the difference between the value of the index at the close of the last trading day of the contract and the price at which the index contract was originally written. Although the value of a securities index is a function of the value of certain specified securities, no physical delivery of those securities is made.

S-13

margin deposits in excess of the minimum required by the exchange. The initial margin is in the nature of a performance bond or good faith deposit on the futures contract, which is returned to the Fund upon termination of the contract, assuming all contractual obligations have been satisfied. The Fund expects to earn interest income on its initial margin deposits. A futures contract held by the Fund is valued daily at the official settlement price of the exchange on which it is traded. Each day the Fund pays or receives cash, called "variation margin," equal to the daily change in value of the futures contract. This process is known as "marking-to-market." Variation margin paid or received by the Fund does not represent a borrowing or loan by the Fund but is instead settlement between the Fund and the broker of the amount one would owe the other if the futures contract had expired at the close of the previous day. In computing daily net asset value, the Fund will mark-to-market its open futures positions.

The Fund is also required to deposit and maintain margin with respect to put and call options on futures contracts written by it. Such margin deposits will vary depending on the nature of the underlying futures contract (and the related initial margin requirements), the current market value of the option and other futures positions held by the Fund. Although some futures contracts call for making or taking delivery of the underlying securities, usually these obligations are closed out prior to delivery by offsetting purchases or sales of matching futures contracts (same exchange, underlying security or index, and delivery month). If an offsetting purchase price is less than the original sale price, the Fund engaging in the transaction realizes a capital gain, or if it is more, the Fund realizes a capital loss. Conversely, if an offsetting sale price is more than the original purchase price, the Fund engaging in the transaction realizes a capital gain, or if it is less, the Fund realizes a capital loss. The transaction costs must also be included in these calculations.

RISKS ASSOCIATED WITH FUTURES. There are several risks associated with the use of futures contracts and futures options. A purchase or sale of a futures contract may result in losses in excess of the amount invested in the futures contract. In trying to increase or reduce market exposure, there can be no guarantee that there will be a correlation between price movements in the futures contract and in the portfolio exposure sought. In addition, there are significant differences between the securities and futures markets that could result in an imperfect correlation between the markets, causing a given transaction not to achieve its objectives. The degree of imperfection of correlation depends on circumstances such as: variations in speculative market demand for futures, futures options and the related securities, including technical influences in futures and futures options trading and differences between the securities markets and the securities underlying the standard contracts available for trading. For example, in the case of index futures contracts, the composition of the index, including the issuers and the weighing of each issue, may differ from the composition of the Fund's portfolio, and, in the case of interest rate futures contracts, the interest rate levels, maturities and creditworthiness of the issues underlying the futures contract may differ from the financial instruments held in the Fund's portfolio. A decision as to whether, when and how to use futures contracts involves the exercise of skill and judgment, and even a well-conceived transaction may be unsuccessful to some degree because of market behavior or unexpected stock price or interest rate trends.

Futures exchanges may limit the amount of fluctuation permitted in certain futures contract prices during a single trading day. The daily limit establishes the maximum amount that the price of a futures contract may vary either up or down from the previous day's settlement price at the end of the current trading session. Once the daily limit has been reached in a futures contract subject to the limit, no more trades may be made on that day at a price beyond that limit. The daily limit governs only price movements during a particular trading day and therefore does not limit potential losses because the limit may work to prevent the liquidation of unfavorable positions. For example, futures prices have occasionally moved to the daily limit for several consecutive trading days with little or no trading, thereby preventing prompt liquidation of positions and subjecting some holders of futures contracts to substantial losses. Stock index futures contracts are not normally subject to such daily price change limitations.

S-14

There can be no assurance that a liquid market will exist at a time when the Fund seeks to close out a futures or futures option position. The Fund would be exposed to possible loss on the position during the interval of inability to close, and would continue to be required to meet margin requirements until the position is closed. In addition, many of the contracts discussed above are relatively new instruments without a significant trading history. As a result, there can be no assurance that an active secondary market will develop or continue to exist.

LIMITATIONS ON OPTIONS AND FUTURES. If other options, futures contracts or futures options of types other than those described herein are traded in the future, the Fund may also use those investment vehicles, provided the Board of Trustees determines that their use is consistent with the Fund's investment objective.

When purchasing a futures contract or writing a put option on a futures contract, the Fund must maintain with its custodian (or broker, if legally permitted) cash or cash equivalents (including any margin) equal to the market value of such contract. When writing a call option on a futures contract, the Fund similarly will maintain with its custodian cash or cash equivalents (including any margin) equal to the amount by which such option is in-the-money until the option expires or is closed by the Fund.

The Fund may not maintain open short positions in futures contracts, call options written on futures contracts or call options written on indexes if, in the aggregate, the market value of all such open positions exceeds the current value of the securities in its portfolio, plus or minus unrealized gains and losses on the open positions, adjusted for the historical relative volatility of the relationship between the portfolio and the positions. For this purpose, to the extent the Fund has written call options on specific securities in its portfolio, the value of those securities will be deducted from the current market value of the securities portfolio.

The Fund has claimed an exclusion from registration as a commodity pool under the Commodity Exchange Act ("CEA") and, therefore, the Fund and its officers and trustees are not subject to the registration requirements of the CEA. The Fund reserves the right to engage in transactions involving futures and options thereon to the extent allowed by Commodity Future Trading Commission ("CFTC") regulations in effect from time to time and in accordance with the Fund's policies.

WARRANTS. The Fund may invest in warrants. A warrant is a right to purchase common stock at a specific price (usually at a premium above the market value of the underlying common stock at time of issuance) during a specified period of time. A warrant may have a life ranging from less than a year to twenty years or longer, but a warrant becomes worthless unless it is exercised or sold before expiration. In addition, if the market price of the common stock does not exceed the warrant's exercise price during the life of the warrant, the warrant will expire worthless. Warrants have no voting rights, pay no dividends and have no rights with respect to the assets of the corporation issuing them. The percentage increase or decrease in the value of a warrant may be greater than the percentage increase or decrease in the value of the underlying common stock.

PORTFOLIO TURNOVER. Although the Fund does not purchase securities with a view to rapid turnover, there are no limitations on the length of time that portfolio securities must be held. Portfolio turnover can occur for a number of reasons, including calls for redemption, general conditions in the securities markets, more favorable investment opportunities in other securities, or other factors relating to the desirability of holding or changing a portfolio investment. The portfolio turnover rates may vary greatly from year to year. A high rate of portfolio turnover in the Fund would result in increased transaction expense, which must be borne by that Fund. High portfolio turnover may also result in the realization of capital gains or losses and, to the extent net short-term capital gains are realized, any distributions resulting from such gains will be considered ordinary income for federal income tax purposes.

S-15

SHORT SALES. The Fund may attempt to hedge against market risk and to enhance income by selling short "against the box," that is: (1) entering into short sales of securities that it currently has the right to acquire through the conversion or exchange of other securities that it owns, or to a lesser extent, entering into short sales of securities that it currently owns; and (2) entering into arrangements with the broker-dealers through which such securities are sold short to receive income with respect to the proceeds of short sales during the period the Fund's short positions remain open. The Fund may make short sales of securities only if at all times when a short position is open the Fund owns an equal amount of such securities or securities convertible into or exchangeable for, without payment of any further consideration, securities of the same issue as, and equal in amount to, the securities sold short.

In a short sale against the box, the Fund does not deliver from its portfolio the securities sold and does not receive immediately the proceeds from the short sale. Instead, the Fund borrows the securities sold short from a broker-dealer through which the short sale is executed, and the broker-dealer delivers such securities, on behalf of the Fund, to the purchaser of such securities. Such broker-dealer is entitled to retain the proceeds from the short sale until the Fund delivers to such broker-dealer the securities sold short. In addition, the Fund is required to pay to the broker-dealer the amount of any dividends paid on shares sold short. Finally, to secure its obligation to deliver to such broker-dealer the securities sold short, the Fund must deposit and continuously maintain in a separate account with the Fund's custodian an equivalent amount of the securities sold short or securities convertible into or exchangeable for such securities without the payment of additional consideration. The Fund is said to have a short position in the securities sold until it delivers to the broker-dealer the securities sold, at which time the Fund receives the proceeds of the sale. Because the Fund ordinarily will want to continue to hold securities in its portfolio that are sold short, the Fund will normally close out a short position by purchasing on the open market and delivering to the broker-dealer an equal amount of the securities sold short, rather than by delivering portfolio securities.

A short sale works the same way, except that the Fund places in the segregated account cash or U.S. government securities equal in value to the difference between (i) the market value of the securities sold short at the time they were sold short and (ii) any cash or U.S. government securities required to be deposited with the broker as collateral. In addition, so long as the short position is open, the Fund must adjust daily the value of the segregated account so that the amount deposited in it, plus any amount deposited with the broker as collateral, will equal the current market value of the security sold short. However, the value of the segregated account may not be reduced below the point at which the segregated account, plus any amount deposited with the broker, is equal to the market value of the securities sold short at the time they were sold short.

Short sales may protect the Fund against the risk of losses in the value of its portfolio securities because any unrealized losses with respect to such portfolio securities should be wholly or partially offset by a corresponding gain in the short position. However, any potential gains in such portfolio securities should be wholly or partially offset by a corresponding loss in the short position. The extent to which such gains or losses are offset will depend upon the amount of securities sold short relative to the amount the Fund owns, either directly or indirectly, and, in the case where the Fund owns convertible securities, changes in the conversion premium. Short sale transactions of the Fund involve certain risks. In particular, the imperfect correlation between the price movements of the convertible securities and the price movements of the underlying common stock being sold short creates the possibility that losses on the short sale hedge position may be greater than gains in the value of the portfolio securities being hedged. In addition, to the extent that the Fund pays a conversion premium for a convertible security, the Fund is generally unable to protect against a loss of such premium pursuant to a short sale hedge. In determining the number of shares to be sold short against the Fund's position in the convertible securities, the anticipated fluctuation in the conversion premiums is considered. The Fund will also incur transaction costs in connection with short sales. Certain provisions of the Internal Revenue Code of 1986, as

S-16

amended (the "Code") (and related Treasury regulations thereunder) may limit the degree to which the Fund is able to enter into short sales and other transactions with similar effects without triggering adverse tax consequences, which limitations might impair the Fund's ability to achieve its investment objective. See "U.S. Federal Income Tax Matters."

In addition to enabling the Fund to hedge against market risk, short sales may afford the Fund an opportunity to earn additional current income to the extent the Fund is able to enter into arrangements with broker-dealers through which the short sales are executed to receive income with respect to the proceeds of the short sales during the period the Fund's short positions remain open.

INTEREST RATE TRANSACTIONS. In order to seek to reduce the interest rate risk inherent in the Fund's underlying investments and capital structure, the Fund, if market conditions are deemed favorable, likely will enter into interest rate swap or cap transactions to attempt to protect itself from increasing dividend or interest expenses on its leverage. Interest rate swaps involve the Fund's agreement with the swap counterparty to pay a fixed rate payment in exchange for the counterparty agreeing to pay the Fund a payment at a variable rate that is expected to approximate the rate on any variable rate payment obligation on the Fund's leverage. The payment obligations would be based on the notional amount of the swap. The Fund may use an interest rate cap, which would require it to pay a premium to the cap counterparty and would entitle it, to the extent that a specified variable rate index exceeds a predetermined fixed rate, to receive from the counterparty payment of the difference based on the notional amount. The Fund would use interest rate swaps or caps only with the intent to reduce or eliminate the risk that an increase in short-term interest rates could have on common share net earnings as a result of leverage.

The Fund will usually enter into swaps or caps on a net basis; that is, the two payment streams will be netted out in a cash settlement on the payment date or dates specified in the instrument, with the Fund receiving or paying, as the case may be, only the net amount of the two payments. The Fund intends to maintain in a segregated account with its custodian cash or liquid securities having a value at least equal to the Fund's net payment obligations under any swap transaction, marked-to-market daily.

The use of interest rate swaps and caps is a highly specialized activity that involves investment techniques and risks different from those associated with ordinary portfolio security transactions. Depending on the state of interest rates in general, the Fund's use of interest rate swaps or caps could enhance or harm the overall performance on the common shares. To the extent there is a decline in interest rates, the value of the interest rate swap or cap could decline, and could result in a decline in the net asset value of the common shares. In addition, if short-term interest rates are lower than the Fund's fixed rate of payment on the interest rate swap, the swap will reduce common share net earnings. If, on the other hand, short-term interest rates are higher than the fixed rate of payment on the interest rate swap, the swap will enhance common share net earnings. Buying interest rate caps could enhance the performance of the common shares by providing a maximum leverage expense. Buying interest rate caps could also decrease the net earnings of the common shares in the event that the premium paid by the Fund to the counterparty exceeds the additional amount the Fund would have been required to pay had it not entered into the cap agreement. The Fund has no current intention of selling an interest rate swap or cap.

Interest rate swaps and caps do not involve the delivery of securities or other underlying assets or principal. Accordingly, the risk of loss with respect to interest rate swaps is limited to the net amount of interest payments that the Fund is contractually obligated to make. If the counterparty defaults, the Fund would not be able to use the anticipated net receipts under the swap or cap to offset the dividend or interest payments on the Fund's leverage. Depending on whether the Fund would be entitled to receive net payments from the counterparty on the swap or cap, which in turn would depend on the general state

S-17

of short-term interest rates at that point in time, such a default could negatively impact the performance of the common shares.

Although this will not guarantee that the counterparty does not default, the Fund will not enter into an interest rate swap or cap transaction with any counter-party that Calamos believes does not have the financial resources to honor its obligation under the interest rate swap or cap transaction. Further, Calamos will continually monitor the financial stability of a counterparty to an interest rate swap or cap transaction in an effort to proactively protect the Fund's investments.

In addition, at the time the interest rate swap or cap transaction reaches its scheduled termination date, there is a risk that the Fund would not be able to obtain a replacement transaction or that the terms of the replacement would not be as favorable as on the expiring transaction. If this occurs, it could have a negative impact on the performance of the Fund's common shares.

The Fund may choose or be required to redeem some or all of the preferred shares or prepay any borrowings. This redemption would likely result in the Fund seeking to terminate early all or a portion of any swap or cap transaction. Such early termination of a swap could result in termination payment by or to the Fund. An early termination of a cap could result in a termination payment to the Fund.

SWAPS, CAPS, FLOORS AND COLLARS. The Fund may enter into interest rate, currency, index and other swaps and the purchase or sale of related caps, floors and collars. The Fund expects to enter into these transactions primarily to preserve a return or spread on a particular investment or portion of its portfolio, to protect against currency fluctuations, as a duration management technique or to protect against any increase in the price of securities the Fund anticipates purchasing at a later date. The Fund will not sell interest rate caps or floors where it does not own securities or other instruments providing the income stream the Fund may be obligated to pay. Interest rate swaps involve the exchange by the Fund with another party of their respective commitments to pay or receive interest, e.g., an exchange of floating rate payments for fixed rate payments with respect to a notional amount of principal. A currency swap is an agreement to exchange cash flows on a notional amount of two or more currencies based on the relative value differential among them and an index swap is an agreement to swap cash flows on a notional amount based on changes in the values of the reference indices. The purchase of a cap entitles the purchaser to receive payments on a notional principal amount from the party selling such cap to the extent that a specified index exceeds a predetermined interest rate or amount. The purchase of a floor entitles the purchaser to receive payments on a notional principal amount from the party selling such floor to the extent that a specified index falls below a predetermined interest rate or amount. A collar is a combination of a cap and a floor that preserves a certain return within a predetermined range of interest rates or values.

The Fund will usually enter into swaps on a net basis, i.e., the two payment streams are netted out in a cash settlement on the payment date or dates specified in the instrument, with the Fund receiving or paying, as the case may be, only the net amount of the two payments. Inasmuch as the Fund will segregate assets (or enter into offsetting positions) to cover its obligations under swaps, Calamos and the Fund believe such obligations do not constitute senior securities under the Investment Company Act of 1940 (the "1940 Act") and, accordingly, will not treat them as being subject to its borrowing restrictions. The Fund will not enter into any swap, cap, floor or collar transaction unless, at the time of entering into such transaction, the unsecured long-term debt of the Counterparty, combined with any credit enhancements, is rated at least A by S&P or Moody's or has an equivalent rating from a NRSRO or is determined to be of equivalent credit quality by Calamos. If there is a default by the Counterparty, the Fund may have contractual remedies pursuant to the agreements related to the transaction. The swap market has grown substantially in recent years with a large number of banks and investment banking firms acting both as principals and as agents utilizing standardized swap documentation. As a result, the

S-18

swap market has become relatively liquid, however, some swaps may be considered illiquid. Caps, floors and collars are more recent innovations for which standardized documentation has not yet been fully developed and, accordingly, they are less liquid than swaps.

STRUCTURED PRODUCTS. The Fund may invest in interests in entities organized and operated for the purpose of restructuring the investment characteristics of certain other investments. This type of restructuring involves the deposit with or purchase by an entity, such as a corporation or trust, of specified instruments and the issuance by that entity of one or more classes of securities ("structured products") backed by, or representing interests in, the underlying instruments. The term "structured products" as used herein excludes synthetic convertibles and interest rate transactions. See "Investment Objective and Policies--Synthetic Convertible Securities and Interest Rate Transactions". The cash flow on the underlying instruments may be apportioned among the newly issued structured products to create securities with different investment characteristics such as varying maturities, payment priorities and interest rate provisions, and the extent of the payments made with respect to structured products is dependent on the extent of the cash flow on the underlying instruments. The Fund may invest in structured products, which represent derived investment positions based on relationships among different markets or asset classes.

The Fund may also invest in other types of structured products, including, among others, baskets of credit default swaps referencing a portfolio of high-yield securities. A structured product may be considered to be leveraged to the extent its interest rate varies by a magnitude that exceeds the magnitude of the change in the index rate. Because they are linked to their underlying markets or securities, investments in structured products generally are subject to greater volatility than an investment directly in the underlying market or security. Total return on the structured product is derived by linking return to one or more characteristics of the underlying instrument. Because certain structured products of the type in which the Fund may invest may involve no credit enhancement, the credit risk of those structured products generally would be equivalent to that of the underlying instruments. The Fund may invest in a class of structured products that is either subordinated or unsubordinated to the right of payment of another class. Subordinated structured products typically have higher yields and present greater risks than unsubordinated structured products. Although the Fund's purchase of subordinated structured products would have similar economic effect to that of borrowing against the underlying securities, the purchase will not be deemed to be leverage for purposes of the Fund's limitations related to borrowing and leverage.

Certain issuers of structured products may be deemed to be "investment companies" as defined in the 1940 Act. As a result, the Fund's investments in these structured products may be limited by the restrictions contained in the 1940 Act. Structured products are typically sold in private placement transactions, and there currently may be active trading market for structured products. As a result, certain structured products in which the Fund invests may be deemed illiquid.

"WHEN-ISSUED" AND DELAYED DELIVERY SECURITIES AND REVERSE REPURCHASE

AGREEMENTS. The Fund may purchase securities on a when-issued or delayed-delivery basis. Although the payment and interest terms of these securities are established at the time the Fund enters into the commitment, the securities may be delivered and paid for a month or more after the date of purchase, when their value may have changed. The Fund makes such commitments only with the intention of actually acquiring the securities, but may sell the securities before settlement date if Calamos deems it advisable for investment reasons. The Fund may utilize spot and forward foreign currency exchange transactions to reduce the risk inherent in fluctuations in the exchange rate between one currency and another when securities are purchased or sold on a when-issued or delayed-delivery basis.

S-19

The Fund may enter into reverse repurchase agreements with banks and securities dealers. A reverse repurchase agreement is a repurchase agreement in which the Fund is the seller of, rather than the investor in, securities and agrees to repurchase them at an agreed-upon time and price. Use of a reverse repurchase agreement may be preferable to a regular sale and later repurchase of securities because it avoids certain market risks and transaction costs.

At the time when the Fund enters into a binding obligation to purchase securities on a when-issued basis or enters into a reverse repurchase agreement, liquid assets (cash, U.S. Government securities or other "high-grade" debt obligations) of the Fund having a value at least as great as the purchase price of the securities to be purchased will be segregated on the books of the Fund and held by the custodian throughout the period of the obligation. The use of these investment strategies may increase net asset value fluctuation.

RULE 144A SECURITIES and ILLIQUID SECURITIES. The Fund may invest without limitation in securities that have not been registered for public sale, but that are eligible for purchase and sale by certain qualified institutional buyers. Investments in Rule 144A Securities could have the effect of increasing the amount of the Fund's assets invested in illiquid securities if qualified institutional buyers are unwilling to purchase these Rule 144A Securities. Illiquid securities may be difficult to dispose of at a fair price at the times when the Fund believes it is desirable to do so. The market price of illiquid securities generally is more volatile than that of more liquid securities, which may adversely affect the price that the Fund pays for or recovers upon the sale of illiquid securities. Illiquid securities are also more difficult to value and Calamos' judgment may play a greater role in the valuation process. Investment of the Fund's assets in illiquid securities may restrict the Fund's ability to take advantage of market opportunities. The risks associated with illiquid securities may be particularly acute in situations in which the Fund's operations require cash and could result in the Fund borrowing to meet its short-term needs or incurring losses on the sale of illiquid securities.

The Fund may invest in bonds, corporate loans, convertible securities, preferred stocks and other securities that lack a secondary trading market or are otherwise considered illiquid. Liquidity of a security relates to the ability to easily dispose of the security and the price to be obtained upon disposition of the security, which may be less than would be obtained for a comparable more liquid security. Such investments may affect the Fund's ability to realize the net asset value in the event of a voluntary or involuntary liquidation of its assets.

TEMPORARY DEFENSIVE INVESTMENTS. The Fund may make temporary investments without limitation when Calamos determines that a defensive position is warranted. Such investments may be in money market instruments, consisting of obligations of, or guaranteed as to principal and interest by, the U.S. Government or its agencies or instrumentalities; certificates of deposit, bankers' acceptances and other obligations of domestic banks having total assets of at least $500 million and that are regulated by the U.S. Government, its agencies or instrumentalities; commercial paper rated in the highest category by a recognized rating agency; and repurchase agreements.

REPURCHASE AGREEMENTS. As part of its strategy for the temporary investment of cash, the Fund may enter into "repurchase agreements" with member banks of the Federal Reserve System or primary dealers (as designated by the Federal Reserve Bank of New York) in such securities. A repurchase agreement arises when the Fund purchases a security and simultaneously agrees to resell it to the vendor at an agreed upon future date. The resale price is greater than the purchase price, reflecting an agreed upon market rate of return that is effective for the period of time the Fund holds the security and that is not related to the coupon rate on the purchased security. Such agreements generally have maturities of no more than seven days and could be used to permit the Fund to earn interest on assets awaiting long term investment. The Fund requires continuous maintenance by the custodian for the Fund's account in the

S-20

Federal Reserve/Treasury Book Entry System of collateral in an amount equal to, or in excess of, the market value of the securities that are the subject of a repurchase agreement. Repurchase agreements maturing in more than seven days are considered illiquid securities. In the event of a bankruptcy or other default of a seller of a repurchase agreement, the Fund could experience both delays in liquidating the underlying security and losses, including: (a) possible decline in the value of the underlying security during the period while the Fund seeks to enforce its rights thereto; (b) possible subnormal levels of income and lack of access to income during this period; and (c) expenses of enforcing its rights.

REAL ESTATE INVESTMENT FUNDS ("REITS") AND ASSOCIATED RISK FACTORS. REITs are pooled investment vehicles which invest primarily in income producing real estate or real estate related loans or interests. REITs are generally classified as equity REITs, mortgage REITs or a combination of equity and mortgage REITs. Equity REITs invest the majority of their assets directly in real property and derive income primarily from the collection of rents. Equity REITs can also realize capital gains by selling properties that have appreciated in value. Mortgage REITs invest the majority of their assets in real estate mortgages and derive income from the collection of interest payments. REITs are generally not taxed on income timely distributed to shareholders provided they comply with the applicable requirements of the Code. The Fund will indirectly bear its proportionate share of any management and other expenses paid by REITs in which it invests in addition to the expenses paid by the Fund. Debt securities issued by REITs are, for the most part, general and unsecured obligations and are subject to risks associated with REITs.

Investing in REITs involves certain unique risks in addition to those risks associated with investing in the real estate industry in general. An equity REIT may be affected by changes in the value of the underlying properties owned by the REIT. A mortgage REIT may be affected by changes in interest rates and the ability of the issuers of its portfolio mortgages to repay their obligations. REITs are dependent upon the skills of their managers and are not diversified. REITs are generally dependent upon maintaining cash flows to repay borrowings and to make distributions to shareholders and are subject to the risk of default by lessees or borrowers. REITs whose underlying assets are concentrated in properties used by a particular industry, such as health care, are also subject to risks associated with such industry.

REITs (especially mortgage REITs) are also subject to interest rate risks. When interest rates decline, the value of a REIT's investment in fixed rate obligations can be expected to rise. Conversely, when interest rates rise, the value of a REIT's investment in fixed rate obligations can be expected to decline. If the REIT invests in adjustable rate mortgage loans the interest rates on which are reset periodically, yields on a REIT's investments in such loans will gradually align themselves to reflect changes in market interest rates. This causes the value of such investments to fluctuate less dramatically in response to interest rate fluctuations than would investments in fixed rate obligations.

REITs may have limited financial resources, may trade less frequently and in a limited volume and may be subject to more abrupt or erratic price movements than larger company securities. Historically REITs have been more volatile in price than the larger capitalization stocks included in Standard & Poor's 500 Stock Index.

REITs are subject to a highly technical and complex set of provisions in the Code. It is possible that the Fund may invest in a real estate company which purports to be a REIT and that the company could fail to qualify as a REIT and as a result, would fail to qualify for tax free pass-through of income under the Code. In the event of any such unexpected failure to qualify as a REIT, the company would be subject to corporate-level taxation, significantly reducing the return to the Fund on its investment in such company. REITs could also possibly fail to maintain their exemptions from registration under the 1940 Act. The above factors may also adversely affect a borrower's or a lessee's ability to meet its obligations to the REIT. In the event of a default by a borrower or lessee, the REIT may experience delays in

S-21

enforcing its rights as a mortgagee or lessor and may incur substantial costs associated with protecting its investments.

OTHER INVESTMENT COMPANIES. The Fund may invest in the securities of other investment companies to the extent that such investments are consistent with the Fund's investment objective and policies and permissible under the 1940 Act. Under the 1940 Act, the Fund may not acquire the securities of other domestic or non-U.S. investment companies if, as a result, (i) more than 10% of the Fund's total assets would be invested in securities of other investment companies, (ii) such purchase would result in more than 3% of the total outstanding voting securities of any one investment company being held by the Fund, or (iii) more than 5% of the Fund's total assets would be invested in any one investment company. These limitations do not apply to the purchase of shares of any investment company in connection with a merger, consolidation, reorganization or acquisition of substantially all the assets of another investment company.

The Fund, as a holder of the securities of other investment companies, will bear its pro rata portion of the other investment companies' expenses, including advisory fees. These expenses are in addition to the direct expenses of the Fund's own operations.

INVESTMENT RESTRICTIONS

The following are the Fund's fundamental investment restrictions. These restrictions may not be changed without the approval of the holders of a majority of the Fund's outstanding voting securities (which for this purpose and under the 1940 Act means the lesser of (i) 67% of the common shares represented at a meeting at which more than 50% of the outstanding common shares are represented or (ii) more than 50% of the outstanding common shares). If the Fund were to issue a class of preferred shares, the investment restrictions could not be changed without the approval of a majority of the outstanding common and preferred shares, voting together as a class, and the approval of a majority of the outstanding preferred shares, voting separately by class.

The Fund may not:

(1) Issue senior securities, except as permitted by the 1940 Act and the rules and interpretive positions of the Commission thereunder.

(2) Borrow money, except as permitted by the 1940 Act and the rules and interpretive positions of the Commission thereunder.

(3) Invest in real estate, except that the Fund may invest in securities of issuers that invest in real estate or interests therein, securities that are secured by real estate or interests therein, securities of real estate investment funds and mortgage-backed securities.

(4) Make loans, except by the purchase of debt obligations, by entering into repurchase agreements or through the lending of portfolio securities and as otherwise permitted by the 1940 Act and the rules and interpretive positions of the Commission thereunder.

(5) Invest in physical commodities or contracts relating to physical commodities.

(6) Act as an underwriter, except as it may be deemed to be an underwriter in a sale of securities held in its portfolio.

S-22

(7) Make any investment inconsistent with the Fund's classification as a diversified investment company under the 1940 Act and the rules and interpretive positions of the Commission thereunder.

(8) Concentrate its investments in securities of companies in any particular industry as defined in the 1940 Act and the rules and interpretive positions of the Commission thereunder.

All other investment policies of the Fund are considered non-fundamental and may be changed by the Board of Trustees without prior approval of the Fund's outstanding voting shares.

Currently under the 1940 Act, the Fund is not permitted to issue preferred shares unless immediately after such issuance the net asset value of the Fund's portfolio is at least 200% of the liquidation value of the outstanding preferred shares (i.e., such liquidation value may not exceed 50% of the value of the Fund's total assets). In addition, currently under the 1940 Act, the Fund is not permitted to declare any cash dividend or other distribution on its common shares unless, at the time of such declaration, the net asset value of the Fund's portfolio (determined after deducting the amount of such dividend or distribution) is at least 200% of such liquidation value. Currently under the 1940 Act, the Fund is not permitted to incur indebtedness unless immediately after such borrowing the Fund has asset coverage of at least 300% of the aggregate outstanding principal balance of indebtedness (i.e., such indebtedness may not exceed 33 1/3% of the value of the Fund's total assets). Additionally, currently under the 1940 Act, the Fund may not declare any dividend or other distribution upon any class of its shares, or purchase any such shares, unless the aggregate indebtedness of the Fund has, at the time of the declaration of any such dividend or distribution or at the time of any such purchase, an asset coverage of at least 300% after deducting the amount of such dividend, distribution, or purchase price, as the case may be.

Currently under the 1940 Act, the Fund is not permitted to lend money or property to any person, directly or indirectly, if such person controls or is under common control with the Fund, except for a loan from the Fund to a company which owns all of the outstanding securities of the Fund, except directors' qualifying shares. Currently, under interpretative positions of the Commission, the Fund may not have on loan at any given time securities representing more than one-third of its total assets.

Currently under the 1940 Act, a "senior security" does not include any promissory note or evidence of indebtedness where such loan is for temporary purposes only and in an amount not exceeding 5% of the value of the total assets of the issuer at the time the loan is made. A loan is presumed to be for temporary purposes if it is repaid within sixty days and is not extended or renewed.

Currently, the Fund would be deemed to "concentrate" in a particular industry if it invested 25% or more of its total assets in that industry. Currently under the 1940 Act, a "diversified company" means a management company which meets the following requirements: at least 75% of the value of its total assets is represented by cash and cash items (including receivables), government securities, securities of other investment companies, and other securities for the purposes of this calculation limited in respect of any one issuer to an amount not greater in value than 5% of the value of the total assets of such management company and not more than 10% of the outstanding voting securities of such issuer.

Under the 1940 Act, the Fund may invest up to 10% of its total assets in the aggregate in shares of other investment companies and up to 5% of its total assets in any one investment company, provided the investment does not represent more than 3% of the voting stock of the acquired investment company at the time such shares are purchased. As a shareholder in any investment company, the Fund will bear its ratable share of that investment company's expenses, and would remain subject to payment of the Fund's advisory fees and other expenses with respect to assets so invested. Holders of common shares

S-23

would therefore be subject to duplicative expenses to the extent the Fund invests in other investment companies. In addition, the securities of other investment companies may also be leveraged and will therefore be subject to the same leverage risks described herein and in the Prospectus. As described in the prospectus in the section entitled "Risks," the net asset value and market value of leveraged shares will be more volatile and the yield to shareholders will tend to fluctuate more than the yield generated by unleveraged shares.

In addition, to comply with U.S. federal income tax requirements for qualification as a "regulated investment company," the Fund's investments will be limited by both an income and an asset diversification test. See "U.S. Federal Income Tax Matters."

As a non-fundamental policy, the Fund may not issue preferred shares, borrow money or issue debt securities in an aggregate amount exceeding 38% of the Fund's total assets.

MANAGEMENT OF THE FUND

TRUSTEES AND OFFICERS. The Fund's Board of Trustees provides broad supervision over the Fund's affairs. The officers of the Fund are responsible for the Fund's operations. The Fund's Trustees and officers are listed below, together with their age, positions held with the Fund, term of office and length of service and principal occupations during the past five years. Asterisks indicates those Trustees who are interested persons of the Fund within the meaning of the 1940 Act, and they are referred to as Interested Trustees. Trustees who are not interested persons of the Fund are referred to as Independent Trustees. Each of the Trustees serves as a Trustee of other investment companies (11 U.S. registered investment portfolios) for which Calamos serves as investment adviser (collectively, the "Calamos Funds"). The address for all Independent and Interested Trustees and all officers of the Fund is 1111 East Warrenville Road, Naperville, Illinois 60563-1493.

                                                     TERM OF OFFICE         PRINCIPAL OCCUPATION DURING PAST FIVE
      NAME AND AGE AT             POSITIONS HELD     AND LENGTH OF          YEARS AND OTHER DIRECTORSHIPS HELD BY
       _______, 2004              WITH THE FUND         SERVICE                          THE TRUSTEE
----------------------------      -------------     ----------------      -----------------------------------------
INTERESTED TRUSTEES:

*John P. Calamos (__)              Trustee and      Trustee since         President and CEO, Calamos Holdings,
                                   President        March 12, 2004.       Inc., Calamos and Calamos Financial
                                                    Term expires          Services, Inc. ("CFS").
                                                    in 2005.

*Nick P. Calamos (__)              Trustee          Trustee since         Senior Executive Vice President, Calamos
                                                    March 12, 2004.       Holdings, Inc., Calamos and CFS.
                                                    Term expires
                                                    in 2007.

+Weston W. Marsh (__)              Trustee          Trustee since         Partner, Freeborn & Peters (law firm).
                                                    March 12, 2004.
                                                    Term expires
                                                    in 2005.

S-24

                                                    TERM OF OFFICE         PRINCIPAL OCCUPATION DURING PAST FIVE
     NAME AND AGE AT            POSITIONS HELD      AND LENGTH OF          YEARS AND OTHER DIRECTORSHIPS HELD BY
      _______, 2004             WITH THE FUND          SERVICE                           THE TRUSTEE
-------------------------       --------------     ----------------      -----------------------------------------
INDEPENDENT TRUSTEES:

Joe F. Hanauer (__)                Trustee          Trustee since         Director, MAF Bancorp (banking);
                                                    March 12, 2004.       Director, Homestore.com, Inc., (Internet
                                                    Term expires          provider of real estate information and
                                                    in 2006.              products); Director, Combined
                                                                          Investments, L.P. (investment management).

John E. Neal (__)                  Trustee          Trustee since         Managing Director, Bank One Capital
                                                    March 12, 2004.       Markets (investment banking) (since
                                                    Term expires          2000); Executive Vice President and Head
                                                    in 2006.              of Real Estate Department, Bank One
                                                                          (1998-2000); Director, the Brickman
                                                                          Group, Ltd.

William R. Rybak (__)              Trustee          Trustee since         Retired Private Investor; Executive Vice
                                                    March 12, 2004.       President and CFO, Van Kampen
                                                    Term expires          Investments, Inc. (investment manager)
                                                    in 2005.              prior thereto; Director, Howe Barnes
                                                                          Investments; Director, PrivateBancorp,
                                                                          Inc.

Stephen B. Timbers (__)            Trustee          Trustee since         Retired Private Investor; Director,
                                                    March 12, 2004.       President and Chief Executive Officer,
                                                    Term expires in       Northern Trust Investments, N.A.
                                                    2007.                 (formerly known and conducting business
                                                                          as Northern Trust Investments, Inc.)
                                                                          (1998-2004); President, Northern Trust
                                                                          Global Investments, a division of
                                                                          Northern Trust Corporation and Executive
                                                                          Vice President, The Northern Trust
                                                                          Company; President, Chief Executive
                                                                          Officer and Director, Zurich Kemper
                                                                          Investments (a financial services
                                                                          company) (from 1996 to 1998); Trustee,
                                                                          Northern Mutual Fund Complex (registered
                                                                          investment companies); Director,
                                                                          USFreightways Corporation.


* John P. Calamos and Nick P. Calamos are trustees who are "interested persons" of the Fund as defined in the Investment Company Act of 1940 because of their position with Calamos.

+ Mr. Marsh is a partner at a law firm that has performed work for a number of underwriters and may be deemed to be an interested person for as long as those underwriters serve as principal underwriters to the Fund. In addition, Mr. Marsh's law firm has performed work for John P. Calamos, the chief executive and a controlling person of Calamos (such work was not with respect to 1940 Act or Investment Advisers Act of 1940 matters). Upon the advice of counsel to the Fund, the Fund does not believe that Mr. Marsh is an "interested person" of Calamos.

S-25

                                                     TERM OF OFFICE         PRINCIPAL OCCUPATION DURING PAST FIVE
       NAME AND AGE AT             POSITIONS HELD    AND LENGTH OF          YEARS AND OTHER DIRECTORSHIPS HELD BY
        _______, 2004              WITH THE FUND        SERVICE                         THE TRUSTEE
----------------------------       ------------     ----------------      -----------------------------------------
FUND OFFICERS:

Nimish Bhatt (__)                  Treasurer        Since March 12,       Senior Vice President and Director of
                                                    2004. Serves at       Operations, Calamos (since 2004); Senior
                                                    the discretion of     Vice President, Alternative Investments
                                                    the Board.            and Tax Services, Bisys (financial services
                                                                          firm) (1996-2004).

Patrick H. Dudasik (__)            Vice President   Since March 12,       Executive Vice President, Chief Financial
                                                    2004. Serves at       and Administrative Officer and Treasurer
                                                    the discretion of     of Calamos Holdings, Inc., Calamos and
                                                    the Board.            CFS (since 2001); Chief Financial
                                                                          Officer, David Gomez and Associates, Inc.
                                                                          (executive search firm) (1998-2001).

James S. Hamman, Jr. (__)          Secretary        Since March 12,       Executive Vice President and General
                                                    2004. Serves at       Counsel, Calamos Holdings, Inc., Calamos
                                                    the discretion of     and CFS (since 1998).
                                                    the Board


Jeff Lotito (__)                   Assistant        Since March 12,       Operations Supervisor, Calamos (since
                                   Treasurer        2004. Serves at       2000); Manager-Fund Administration, Van
                                                    the discretion of     Kampen Investments, Inc. (investment
                                                    the Board             management) (1999-2000);
                                                                          Supervisor-Corporate Accounting, Stein
                                                                          Roe and Farnham (investment
                                                                          manager)(1998-1999).

Ian J. McPheron (__)               Assistant        Since March 12,       Associate Counsel and Director of
                                   Secretary        2004. Serves at       Compliance of Calamos and CFS (since
                                                    the discretion of     2002); Associate, Gardner, Carton &
                                                    the Board.            Douglas (law firm) (2002); Vice
                                                                          President, Associate General Counsel and
                                                                          Assistant Secretary, Van Kampen
                                                                          Investments, Inc. (2000-2002); Associate,
                                                                          Wildman, Harrold, Allen & Dixon (law
                                                                          firm) (1997-2000).

The Fund's Board of Trustees consists of seven members. The term of one class expires each year commencing with the first annual meeting following this public offering and no term shall continue for more than three years after the applicable election. The terms of John P. Calamos, Weston W. Marsh and William Rybak expire at the first annual meeting following this public offering, the terms of Joe F. Hanauer and John E. Neal expire at the second annual meeting, and the terms of Nick P. Calamos and Stephen B. Timbers expire at the third annual meeting. Subsequently, each class of Trustees will stand for election at the conclusion of its respective term. Such classification may prevent replacement of a majority of the Trustees for up to a two-year period. Each officer serves until his or her successor is chosen and qualified or until his or her resignation or removal by the Board of Trustees.

COMMITTEES OF THE BOARD OF TRUSTEES. The Fund's Board of Trustees currently has three standing committees:

Executive Committee. Messrs. John Calamos and Nick Calamos are members of the Executive Committee, which has authority during intervals between meetings of the Board of Trustees to exercise the powers of the Board, with certain exceptions.

S-26

Audit Committee. Messrs. Hanauer, Neal, Rybak and Timbers, each a non-interested Trustee, serve on the Audit Committee. The Audit Committee approves the selection of the independent auditors to the Trustees, approves services to be rendered by the auditors, monitors the auditors' performance, reviews the results of the Fund's audit, determines whether to recommend to the Board that the Fund's audited financial statements be included in the Fund's annual report and responds to other matters deemed appropriate by the Board of Trustees.

Governance Committee. Messrs. Hanauer, Neal, Rybak and Timbers, each a non-interested Trustee, serve on the Governance Committee. The Governance Committee oversees the independence and effective functioning of the Board of Trustees and endeavors to be informed about good practices for fund boards. The members of the Governance Committee make recommendations to the Board of Trustees regarding candidates for election as non-interested Trustees. The Governance Committee will not consider shareholder recommendations regarding candidates for election as Trustees.

In addition to the above committees, there is a Board of Trustee directed pricing committee comprised of officers of the Fund and employees of Calamos. The Fund's Agreement and Declaration of Trust provides that the Fund will indemnify the Trustees and officers against liabilities and expenses incurred in connection with any claim in which they may be involved because of their offices with the Fund, unless it is determined in the manner specified in the Agreement and Declaration of Trust that they have not acted in good faith in the reasonable belief that their actions were in the best interests of the Fund or that such indemnification would relieve any officer or Trustee of any liability to the Fund or its shareholders by reason of willful misfeasance, bad faith, gross negligence or reckless disregard of his or her duties.

COMPENSATION OF OFFICERS AND TRUSTEES. The Fund pays no salaries or compensation to any of its officers or to the Trustees who are affiliated persons of Calamos. The following table sets forth certain information with respect to the compensation paid to each Trustee by the Fund and the Calamos Fund Complex as a group. Compensation from the Fund is for the current calendar year and is estimated. Total compensation from the Calamos Fund Complex as a group is for the calendar year ended December 31, 2003.

                                               ESTIMATED AGGREGATE            TOTAL COMPENSATION FROM
         NAME OF TRUSTEE                      COMPENSATION FROM FUND          CALAMOS FUND COMPLEX(1)*
----------------------------------           -----------------------        ---------------------------
John P. Calamos...................                     $                                 $
Nick P. Calamos...................
Richard J. Dowen(2)...............
Joe F. Hanauer....................
Weston W. Marsh...................
John E. Neal......................
William Rybak.....................
Stephen B. Timbers................


(1) Includes fees that may have been deferred during the year pursuant to a deferred compensation plan with Calamos Investment Trust. Deferred amounts are treated as though such amounts have been invested and reinvested in shares of one or more of the Calamos Funds selected by the trustee. As of December 31, 2003, the values of Mr. Neal's deferred compensation accounts was $102,377.

(2) Mr. Dowen resigned effective January 1, 2004.

* The Calamos Fund Complex consists of six investment companies and each applicable series thereunder including the Fund, Calamos Investment Trust, Calamos Advisors Trust, Calamos Convertible Opportunities and Income Fund, Calamos Convertible and High Income Fund and Calamos Strategic Total Return Fund.

S-27

The Fund has adopted a deferred compensation plan (the "Plan"). Under the Plan, a Trustee who is not an "interested person" of Calamos and who has elected to participate in the Plan ("participating Trustees") may defer receipt of all or a portion of his compensation from Fund in order to defer payment of income taxes or for other reasons. The deferred compensation payable to the participating Trustee is credited to Trustee's deferral account as of the business day such compensation would have been paid to the Trustee. The value of a Trustee's deferred compensation account at any time is equal to what would be the value if the amounts credited to the account had instead been invested in shares of one or more of the portfolios of Calamos Investment Trust as designated by the Trustee. Thus, the value of the account increases with contributions to the account or with increases in the value of the measuring shares, and the value of the account decreases with withdrawals from the account or with declines in the value of the measuring shares. If a participating trustee retires, the Trustee may elect to receive payments under the plan in a lump sum or in equal installments over a period of five years. If a participating Trustee dies, any amount payable under the Plan will be paid to the Trustee's beneficiaries.

OWNERSHIP OF SHARES OF THE FUND AND OTHER CALAMOS FUNDS. The following table indicates the value of shares that each Trustee beneficially owns in the Fund and the Calamos Fund Complex in the aggregate. The value of shares of the Calamos Funds is determined on the basis of the net asset value of the class of shares held as of December 31, 2003. The value of the shares held are stated in ranges in accordance with the requirements of the Commission. The table reflects the Trustee's beneficial ownership of shares of the Calamos Fund Complex. Beneficial ownership is determined in accordance with the rules of the Commission.

                                                     DOLLAR RANGE OF            AGGREGATE DOLLAR RANGE OF EQUITY
                                                  EQUITY SECURITIES IN       SECURITIES IN ALL REGISTERED INVESTMENT
              NAME OF TRUSTEE                           THE FUND                COMPANIES IN THE CALAMOS FUNDS(1)
---------------------------------------------     --------------------       ---------------------------------------
INTERESTED TRUSTEES:
John P. Calamos..............................             None
Nick P. Calamos..............................             None
Weston W. Marsh..............................             None

NON-INTERESTED TRUSTEES:
Joe F. Hanauer...............................             None
John E. Neal.................................             None
William Rybak................................             None
Stephen B. Timbers...........................             None

CODE OF ETHICS. The Fund and Calamos have adopted a code of ethics under Rule 17j-1 of the 1940 Act which is applicable to officers, directors/Trustees and designated employees of Calamos and CFS. Employees of Calamos and CFS are permitted to make personal securities transactions, including transactions in securities that the Fund may purchase, sell or hold, subject to requirements and restrictions set forth in the code of ethics of Calamos and CFS. The code of ethics contains provisions and requirements designed to identify and address certain conflicts of interest between personal investment activities of Calamos and CFS employees and the interests of investment advisory clients such as the Fund. Among other things, the code of ethics prohibits certain types of transactions absent prior approval, imposes time periods during which personal transactions may not be made in certain securities, and requires the submission of duplicate broker confirmations and statements and quarterly reporting of securities transactions. Additional restrictions apply to portfolio managers, traders, research analysts and others involved in the investment advisory process. Exceptions to these and other provisions of the code of ethics may be granted in particular circumstances after review by appropriate personnel. Text-only versions of the code of ethics can be viewed online or downloaded from the EDGAR Database on the Commission's internet web site at www.sec.gov. You may review and copy the code of ethics by visiting the Commission's Public Reference Room in Washington, D.C. Information on the operation of the

S-28

Public Reference Room may be obtained by calling the Commission at 202-942-8090. In addition, copies of the code of ethics may be obtained, after mailing the appropriate duplicating fee, by writing to the Commission's Public Reference Section, 450 5th Street, N.W., Washington, DC 20549-0102 or by e-mail request at publicinfo@sec.gov.

PROXY VOTING PROCEDURES. The Fund has delegated proxy voting responsibilities to Calamos, subject to the Board of Trustees' general oversight. The Fund expects Calamos to vote proxies related to the Fund's portfolio securities for which the Fund has voting authority consistent with the Fund's best economic interests. Calamos has adopted its own Proxy Voting Policies and Procedures ("Policies"). The Policies address, among other things, conflicts of interest that may arise between the interests of the Fund, and the interests of the adviser and its affiliates.

The following is a summary of the Policies used by Calamos in voting proxies.

To assist it in voting proxies, Calamos has established a Committee comprised of members of its Portfolio Management and Research Departments. The Committee and/or its members will vote proxies using the following guidelines.

In general, if Calamos believes that a company's management and board have interests sufficiently aligned with the Fund's interest, Calamos will vote in favor of proposals recommended by a company's board. More specifically, Calamos seeks to ensure that the board of directors of a company is sufficiently aligned with security holders' interests and provides proper oversight of the company's management. In many cases this may be best accomplished by having a majority of independent board members. Although Calamos will examine board member elections on a case-by-case basis, it will generally vote for the election of directors that would result in a board comprised of a majority of independent directors.

Because of the enormous variety and complexity of transactions that are presented to shareholders, such as mergers, acquisitions, reincorporations, adoptions of anti-take over measures (including adoption of a shareholder rights plan, requiring supermajority voting on particular issues, adoption of fair price provisions, issuance of blank check preferred stocks and the creation of a separate class of stock with unequal voting rights), changes to capital structures (including authorizing additional shares, repurchasing stock or approving a stock split), executive compensation and option plans, that occur in a variety of industries, companies and market cycles, it is extremely difficult to foresee exactly what would be in the best interests of the Fund in all circumstances. Moreover, voting on such proposals involves considerations unique to each transaction. Accordingly, Calamos will vote on a case-by-case basis on proposals presenting these transactions.

Finally Calamos has established procedures to help resolve conflicts of interests that might arise when voting proxies for the Fund. These procedures provide that the Committee, along with Calamos' Legal and Compliance Departments, will examine conflicts of interests with the Fund of which Calamos is aware and seek to resolve such conflicts in the best interests of the Fund, irrespective of any such conflict. If a member of the Committee has a personal conflict of interest, that member will refrain from voting and the remainder of the Committee will determine how to vote the proxy solely on the investment merits of any proposal. The Committee will then memorialize the conflict and the procedures used to address the conflict.

You may obtain a copy a Calamos' Policies by calling (800) 582-6959, by visiting the Fund's website at www.calamos.com, by writing Calamos at: Calamos Investments, Attn: Client Services, 1111 East Warrenville Road, Naperville, IL 60563, and on the Commission's website at www.sec.gov.

S-29

INVESTMENT ADVISER AND INVESTMENT MANAGEMENT AGREEMENT. Subject to the overall authority of the board of trustees, Calamos provides the Fund with investment research, advice and supervision and furnishes continuously an investment program for the Fund. In addition, Calamos furnishes for use of the Fund such office space and facilities as the Fund may require for its reasonable needs and supervises the business and affairs of the Fund and provides the following other services on behalf of the Fund and not provided by persons not a party to the investment management agreement: (i) preparing or assisting in the preparation of reports to and meeting materials for the Trustees; (ii) supervising, negotiating contractual arrangements with, to the extent appropriate, and monitoring the performance of, accounting agents, custodians, depositories, transfer agents and pricing agents, accountants, attorneys, printers, underwriters, brokers and dealers, insurers and other persons in any capacity deemed to be necessary or desirable to Fund operations; (iii) assisting in the preparation and making of filings with the Commission and other regulatory and self-regulatory organizations, including, but not limited to, preliminary and definitive proxy materials, amendments to the Fund's registration statement on Form N-2 and semi-annual reports on Form N-SAR and Form N-CSR; (iv) overseeing the tabulation of proxies by the Fund's transfer agent; (v) assisting in the preparation and filing of the Fund's federal, state and local tax returns; (vi) assisting in the preparation and filing of the Fund's federal excise tax return pursuant to Section 4982 of the Code; (vii) providing assistance with investor and public relations matters; (viii) monitoring the valuation of portfolio securities and the calculation of net asset value; (ix) monitoring the registration of shares of beneficial interest of the Fund under applicable federal and state securities laws; (x) maintaining or causing to be maintained for the Fund all books, records and reports and any other information required under the 1940 Act, to the extent that such books, records and reports and other information are not maintained by the Fund's custodian or other agents of the Fund; (xi) assisting in establishing the accounting policies of the Fund; (xii) assisting in the resolution of accounting issues that may arise with respect to the Fund's operations and consulting with the Fund's independent accountants, legal counsel and the Fund's other agents as necessary in connection therewith; (xiii) reviewing the Fund's bills; (xiv) assisting the Fund in determining the amount of dividends and distributions available to be paid by the Fund to its shareholders, preparing and arranging for the printing of dividend notices to shareholders, and providing the transfer and dividend paying agent, the custodian, and the accounting agent with such information as is required for such parties to effect the payment of dividends and distributions; and (xv) otherwise assisting the Fund as it may reasonably request in the conduct of the Fund's business, subject to the direction and control of the Trustees.

Under the investment management agreement, the Fund pays to Calamos a fee based on the average weekly managed assets that is accrued daily and paid on a monthly basis. The fee paid by the Fund is at the annual rate of 1.00% of managed assets. Because the fees paid to Calamos are determined on the basis of the Fund's managed assets, Calamos' interest in determining whether to leverage the Fund may differ from the interests of the Fund.

Under the terms of its investment management agreement with the Fund, except for the services and facilities provided by Calamos as set forth therein, the Fund shall assume and pay all expenses for all other Fund operations and activities and shall reimburse Calamos for any such expenses incurred by Calamos. The expenses borne by the Fund shall include, without limitation: (a) organization expenses of the Fund (including out-of-pocket expenses, but not including the Manager's overhead or employee costs); (b) fees payable to Calamos; (c) legal expenses; (d) auditing and accounting expenses; (e) maintenance of books and records that are required to be maintained by the Fund's custodian or other agents of the Fund; (f) telephone, telex, facsimile, postage and other communications expenses; (g) taxes and governmental fees; (h) fees, dues and expenses incurred by the Fund in connection with membership in investment company trade organizations and the expense of attendance at professional meetings of such organizations; (i) fees and expenses of accounting agents, custodians, subcustodians, transfer agents, dividend disbursing agents and registrars; (j) payment for portfolio pricing or valuation services to pricing agents, accountants, bankers and other specialists, if any; (k) expenses of preparing share certificates;

S-30

(l) expenses in connection with the issuance, offering, distribution, sale, redemption or repurchase of securities issued by the Fund; (m) expenses relating to investor and public relations provided by parties other than Calamos; (n) expenses and fees of registering or qualifying shares of beneficial interest of the Fund for sale; (o) interest charges, bond premiums and other insurance expenses; (p) freight, insurance and other charges in connection with the shipment of the Fund's portfolio securities; (q) the compensation and all expenses (specifically including travel expenses relating to Fund business) of Trustees, officers and employees of the Fund who are not affiliated persons of Calamos; (r) brokerage commissions or other costs of acquiring or disposing of any portfolio securities of the Fund; (s) expenses of printing and distributing reports, notices and dividends to shareholders; (t) expenses of preparing and setting in type, printing and mailing prospectuses and statements of additional information of the Fund and supplements thereto; (u) costs of stationery; (v) any litigation expenses; (w) indemnification of Trustees and officers of the Fund; (x) costs of shareholders' and other meetings; (y) interest on borrowed money, if any; and (z) the fees and other expenses of listing the Fund's shares on the New York Stock Exchange or any other national stock exchange.

Unless earlier terminated as described below, the investment management agreement will remain in effect until August 1, 200_. The investment management agreement continues in effect from year to year so long as such continuation is approved at least annually by (1) the board of trustees or the vote of a majority of the outstanding voting securities (as defined in the 1940 Act) of the Fund, and (2) a majority of the trustees who are not interested persons of any party to the investment management agreement, cast in person at a meeting called for the purpose of voting on such approval. The investment management agreement may be terminated at any time, without penalty, by either the Fund or Calamos upon 60 days' written notice, and is automatically terminated in the event of its assignment as defined in the 1940 Act.

FACTORS CONSIDERED BY THE INDEPENDENT TRUSTEES IN APPROVING THE INVESTMENT MANAGEMENT AGREEMENT. The Fund's investment management agreement is required to be approved before it is entered into, and may be continued annually beyond its initial term both by the Board of Trustees and by a majority of the Independent Trustees voting separately. The Independent Trustees have determined that the terms of the Fund's investment management agreement are fair and reasonable and that the agreement is in the Fund's best interests. The Independent Trustees believe that the investment management agreement will enable the Fund to enjoy high quality investment management services at a cost which they deem appropriate, reasonable and in the best interests of the Fund. In making such determinations, the Independent Trustees relied upon the assistance of counsel to the Independent Trustees.

In evaluating the investment management agreement, the Independent Trustees reviewed materials furnished by Calamos, including information regarding Calamos, its affiliates and their personnel, operations and financial condition. The Independent Trustees discussed with representatives of Calamos the Fund's operations and Calamos' ability to provide advisory and other services to the Fund. The Independent Trustees also reviewed, among other things:

- the investment performance of other Calamos funds with similar investment strategies;

- the proposed fees to be charged by Calamos for investment management services;

- the Fund's projected total operating expenses;

- the investment performance, fees and total expenses of investment companies with similar objectives and strategies managed by other investment advisers; and

- the experience of the investment advisory and other personnel providing services to the Fund and the historical quality of the services provided by Calamos.

S-31

The independent trustees considered the following as relevant to their recommendations: (1) the favorable history, reputation, qualification, investment process and background of Calamos, as well as the qualifications of its personnel, resources available and its financial condition; (2) the magnitude of Calamos' fees and the estimated expense ratio of the Fund in relation to the nature and quality of services expected to be provided and the fees and expense ratios of comparable investment companies; (3) the relative performance of other funds managed by Calamos with similar objectives compared to the results of other comparable investment companies and unmanaged indices; and (4) other factors that the Independent Trustees deemed relevant. The independent trustees deemed each of these factors to be relevant to their consideration of the Agreement, and concluded that the terms of the Agreement and the services to be provided were reasonable and appropriate, and that the Agreement was in the best interests of the Funds.

The use of the name "Calamos" in the name of the Fund is pursuant to licenses granted by Calamos, and the Fund has agreed to change the names to remove those references if Calamos ceases to act as investment adviser to the Fund.

FUND ACCOUNTANT. Under the arrangements with State Street Bank and Trust Company ("State Street") to provide fund accounting services, State Street provides certain administrative and accounting services including providing daily reconciliation of cash, trades and positions; maintaining general ledger and capital stock accounts; preparing daily trial balance; calculating net asset value; providing selected general ledger reports; preferred share compliance; calculating total returns; and providing monthly distribution analysis to the Fund and such other funds advised by Calamos that may be part of those arrangements (the Fund and such other funds are collectively referred to as the "Calamos Funds") as described more fully in the statement of additional information. For the services rendered to the Calamos Funds, State Street receives fees based on the combined managed assets of the Calamos Funds ("Combined Assets"). State Street receives a fee at the annual rate of .0225% for the first $3 billion of Combined Assets and .0150% for the Combined Assets in excess of $3 billion. Each fund of the Calamos Funds pays its pro-rata share of the fees payable to State Street described below based on relative managed assets of each fund.

Calamos will provide the following financial accounting services to Calamos Funds, rather than State Street: management of expenses and expense payment processing; monitor the calculation of expense accrual amounts for any fund and make any necessary modifications; coordinate any expense reimbursement calculations and payment; calculate yields on the funds in accordance with rules and regulations of the Commission; calculate net investment income dividends and capital gains distributions; calculate track and report tax adjustments on all assets of each fund, including but not limited to contingent debt and preferred trust obligations; prepare excise tax and fiscal year distributions schedules; prepare tax information required for financial statement footnotes; prepare state and federal income tax returns; prepare specialized calculations of amortization on convertible securities; prepare year-end dividend disclosure information; monitor trustee deferred compensation plan accruals and valuations; and prepare Form 1099 information statements for Board members and service providers. For providing those financial accounting services, will receive a fee payable monthly at the annual rate of 0.0175% on the first $1 billion of Combined Assets; 0.0150% on the next $1 billion of Combined Assets; and 0.0110% on Combined Assets above $2 billion ("financial accounting service fee"). Each fund of the Calamos Funds will pay its pro-rata share of the financial accounting service fee payable to Calamos based on relative managed assets of each fund.

PORTFOLIO TRANSACTIONS

Portfolio transactions on behalf of the Fund effected on stock exchanges involve the payment of negotiated brokerage commissions. There is generally no stated commission in the case of securities

S-32

traded in the over-the-counter markets, but the price paid by the Fund usually includes an undisclosed dealer commission or mark-up. In underwritten offerings, the price paid by the Fund includes a disclosed, fixed commission or discount retained by the underwriter or dealer.

In executing portfolio transactions, Calamos uses its best efforts to obtain for the Fund the most favorable combination of price and execution available. In seeking the most favorable combination of price and execution, Calamos considers all factors it deems relevant, including price, the size of the transaction, the nature of the market for the security, the amount of commission, the timing of the transaction taking into account market prices and trends, the execution capability of the broker-dealer and the quality of service rendered by the broker-dealer in other transactions.

The Trustees have determined that portfolio transactions for the Fund may be executed through CFS if, in the judgment of Calamos, the use of CFS is likely to result in prices and execution at least as favorable to the Funds as those available from other qualified brokers and if, in such transactions, CFS charges the Fund commission rates consistent with those charged by CFS to comparable unaffiliated customers in similar transactions. The Board of Trustees, including a majority of the Trustees who are not "interested" trustees, has adopted procedures that are reasonably designed to provide that any commissions, fees or other remuneration paid to CFS are consistent with the foregoing standard. The Fund will not effect principal transactions with CFS.

Consistent with the Rules of Fair Practice of the National Association of Securities Dealers, Inc. and subject to seeking the most favorable combination of net price and execution available and such other policies as the Trustees may determine, Calamos may consider sales of shares of the Fund as a factor in the selection of broker-dealers to execute portfolio transactions for that Fund.

In allocating the Fund's portfolio brokerage transactions to unaffiliated broker-dealers, Calamos may take into consideration the research, analytical, statistical and other information and services provided by the broker-dealer, such as general economic reports and information, reports or analyses of particular companies or industry groups, market timing and technical information, and the availability of the brokerage firm's analysts for consultation. Although Calamos believes these services have substantial value, they are considered supplemental to Calamos' own efforts in the performance of its duties under the management agreement. As permitted by Section 28(e) of the Securities Exchange Act of 1934 ("1934 Act"), Calamos may pay a broker-dealer that provides brokerage and research services an amount of commission for effecting a securities transaction for the Fund in excess of the commission that another broker-dealer would have charged for effecting that transaction if the amount is believed by Calamos to be reasonable in relation to the value of the overall quality of the brokerage and research services provided. Other clients of Calamos may indirectly benefit from the provision of these services to Calamos, and the Fund may indirectly benefit from services provided to Calamos as a result of transactions for other clients.

REPURCHASE OF COMMON SHARES

The Fund is a closed-end investment company and as such its shareholders will not have the right to cause the Fund to redeem their shares. Instead, the Fund's common shares will trade in the open market at a price that will be a function of several factors, including dividend levels (which are in turn affected by expenses), net asset value, call protection, dividend stability, relative demand for and supply of such shares in the market, general market and economic conditions and other factors. Because shares of a closed-end investment company may frequently trade at prices lower than net asset value, the Fund's Board of Trustees may consider action that might be taken to reduce or eliminate any material discount from net asset value in respect of common shares, which may include the repurchase of such shares in the open market or in private transactions, the making of a tender offer for such shares, or the conversion of the Fund to an open-end investment company. The Board of Trustees may decide not to take any of these

S-33

actions. In addition, there can be no assurance that share repurchases or tender offers, if undertaken, will reduce market discount.

Notwithstanding the foregoing, at any time when the Fund's preferred shares are outstanding, the Fund may not purchase, redeem or otherwise acquire any of its common shares unless (1) all accumulated preferred shares dividends have been paid and (2) at the time of such purchase, redemption or acquisition, the net asset value of the Fund's portfolio (determined after deducting the acquisition price of the common shares) is at least 200% of the liquidation value of the outstanding preferred shares (expected to equal the original purchase price per share plus any accrued and unpaid dividends thereon). Any service fees incurred in connection with any tender offer made by the Fund will be borne by the Fund and will not reduce the stated consideration to be paid to tendering shareholders.

Subject to its investment restrictions, the Fund may borrow to finance the repurchase of shares or to make a tender offer. Interest on any borrowings to finance share repurchase transactions or the accumulation of cash by the Fund in anticipation of share repurchases or tenders will reduce the Fund's net income. Any share repurchase, tender offer or borrowing that might be approved by the Fund's Board of Trustees would have to comply with the Exchange Act, the 1940 Act and the rules and regulations thereunder.

Although the decision to take action in response to a discount from net asset value will be made by the Board of Trustees at the time it considers such issue, it is not currently anticipated that the Board of Trustees would authorize repurchases of common shares or a tender offer for such shares if: (1) such transactions, if consummated, would (a) result in the delisting of the common shares from the New York Stock Exchange, or (b) impair the Fund's status as a regulated investment company under the Code (which would make the Fund a taxable entity, causing the Fund's income to be taxed at the corporate level in addition to the taxation of shareholders who receive dividends from the Fund) or as a registered closed-end investment company under the 1940 Act; (2) the Fund would not be able to liquidate portfolio securities in an orderly manner and consistent with the Fund's investment objective and policies in order to repurchase shares; or (3) there is, in the board's judgment, any (a) material legal action or proceeding instituted or threatened challenging such transactions or otherwise materially adversely affecting the Fund, (b) general suspension of or limitation on prices for trading securities on the New York Stock Exchange, (c) declaration of a banking moratorium by federal or state authorities or any suspension of payment by United States or New York banks, (d) material limitation affecting the Fund or the issuers of its portfolio securities by federal or state authorities on the extension of credit by lending institutions or on the exchange of foreign currency, (e) commencement of war, armed hostilities or other international or national calamity directly or indirectly involving the United States, or (f) other event or condition which would have a material adverse effect (including any adverse tax effect) on the Fund or its shareholders if shares were repurchased.

The repurchase by the Fund of its shares at prices below net asset value will result in an increase in the net asset value of those shares that remain outstanding. However, there can be no assurance that share repurchases or tender offers at or below net asset value will result in the Fund's shares trading at a price equal to their net asset value. Nevertheless, the fact that the Fund's shares may be the subject of repurchase or tender offers from time to time, or that the Fund may be converted to an open-end investment company, may reduce any spread between market price and net asset value that might otherwise exist.

In addition, a purchase by the Fund of its common shares will decrease the Fund's total managed assets which would likely have the effect of increasing the Fund's expense ratio. Any purchase by the Fund of its common shares at a time when preferred shares are outstanding will increase the leverage applicable to the outstanding common shares then remaining. Before deciding whether to take any action

S-34

if the common shares trade below net asset value, the Fund's Board of Trustees would likely consider all relevant factors, including the extent and duration of the discount, the liquidity of the Fund's portfolio, the impact of any action that might be taken on the Fund or its shareholders and market considerations. Based on these considerations, even if the Fund's shares should trade at a discount, the Board of Trustees may determine that, in the interest of the Fund and its shareholders, no action should be taken.

U.S. FEDERAL INCOME TAX MATTERS

The following is a summary discussion of certain U.S. federal income tax consequences that may be relevant to a shareholder that acquires, holds and/or disposes of common shares of the Fund. This discussion only addresses U.S. federal income tax consequences to U.S. shareholders who hold their shares as capital assets and does not address all of the U.S. federal income tax consequences that may be relevant to particular shareholders in light of their individual circumstances. This discussion also does not address the tax consequences to shareholders who are subject to special rules, including, without limitation, banks and financial institutions, insurance companies, dealers in securities or foreign currencies, foreign holders, persons who hold their shares as or in a hedge against currency risk, a constructive sale, or conversion transaction, holders who are subject to the alternative minimum tax, or tax-exempt or tax-deferred plans, accounts, or entities. In addition, the discussion does not address any state, local, or foreign tax consequences. The discussion reflects applicable tax laws of the United States as of the date hereof, which tax laws may be changed or subject to new interpretations by the courts or the Internal Revenue Service ("IRS") retroactively or prospectively. No attempt is made to present a detailed explanation of all U.S. federal income tax concerns affecting the Fund and its shareholders, and the discussion set forth herein does not constitute tax advice. INVESTORS ARE URGED TO CONSULT THEIR OWN TAX ADVISERS BEFORE MAKING AN INVESTMENT IN THE FUND TO DETERMINE THE SPECIFIC TAX CONSEQUENCES TO THEM OF INVESTING IN THE FUND, INCLUDING THE APPLICABLE FEDERAL, STATE, LOCAL AND FOREIGN TAX CONSEQUENCES AS WELL AS THE EFFECT OF POSSIBLE CHANGES IN TAX LAWS.

The Fund intends to elect to be treated and to qualify each year as a "regulated investment company" under Subchapter M of the Internal Revenue Code of 1986, as amended (the "Code") so that it will not pay U.S. federal income tax on income and capital gains timely distributed to shareholders. In order to qualify as a regulated investment company under Subchapter M of the Code, the Fund must, among other things, derive at least 90% of its gross income for each taxable year from dividends, interest, payments with respect to securities loans, gains from the sale or other disposition of stock, securities or foreign currencies, or other income (including gains from options, futures and forward contracts) derived with respect to its business of investing in such stock, securities or currencies (the "90% income test"). For purposes of the 90% income test, the character of income earned by certain entities in which the Fund invests that are not treated as corporations (e.g., partnerships) for U.S. federal income tax purposes will generally pass through to the Fund. Consequently, the Fund may be required to limit its equity investments in such entities that earn fee income, rental income or other nonqualifying income. In addition to the 90% income test, the Fund must also diversify its holdings (commonly referred to as the "asset test") so that, at the end of each quarter of its taxable year (i) at least 50% of the market value of the Fund's total assets is represented by cash and cash items, U.S. government securities, securities of other regulated investment companies and other securities, with such other securities of any one issuer limited for the purposes of this calculation to an amount not greater in value than 5% of the value of the Fund's total assets and to not more than 10% of the outstanding voting securities of such issuer, and (ii) not more than 25% of the value of its total assets is invested in the securities of any one issuer (other than U.S. government securities or securities of other regulated investment companies) or of two or more issuers controlled by the Fund and engaged in the same, similar or related trades or businesses.

If the Fund qualifies as a regulated investment company and distributes to its shareholders at least 90% of the sum of (i) its "investment company taxable income" as that term is defined in the Code (which

S-35

includes, among other things, dividends, taxable interest, and the excess of any net short-term capital gains over net long-term capital losses as reduced by certain deductible expenses) without regard to the deduction for dividends paid and (ii) the excess of its gross tax-exempt interest, if any, over certain disallowed deductions, the Fund will be relieved of U.S. federal income tax on any income of the Fund, including long-term capital gains, distributed to shareholders. However, if the Fund retains any investment company taxable income or "net capital gain" (i.e., the excess of net long-term capital gains over net short-term capital losses), it will be subject to U.S. federal income tax at regular corporate rates (currently at a maximum rate of 35%) on the amount retained. The Fund intends to distribute at least annually, all or substantially all of its investment company taxable income, net tax-exempt interest, and net capital gain. Under the Code, the Fund will be subject to a nondeductible 4% federal excise tax on a portion of its undistributed ordinary income and capital gains for any calendar year if it fails to meet certain distribution requirements with respect to such calendar year. The Fund intends to make distributions in a timely manner and accordingly does not expect to be subject to this excise tax.

If for any taxable year the Fund does not qualify as a regulated investment company for U.S. federal income tax purposes, it would be treated as a U.S. corporation subject to U.S. federal income tax and distributions to its shareholders would not be deductible by the Fund in computing its taxable income. In such event, the Fund's distributions, to the extent derived from the Fund's current or accumulated earnings and profits, would generally constitute ordinary dividends, which would be eligible for the dividends received deduction available to corporate shareholders under Section 243 of the Code, and non corporate shareholders of the Fund generally would be able to treat such distributions as "qualified dividend income" under Section 1(h)(11) of the Code as discussed below.

The Fund expects to declare the initial monthly dividend on the common shares within approximately 60 days of the completion of this offering and to pay that initial monthly dividend approximately 90 days after the completion of this offering. The Fund intends to distribute any net short- and long-term capital gains at least annually. Dividends from income and/or capital gains may also be paid at such other times as may be necessary for the Fund to avoid U.S. federal income or excise taxes.

Unless a shareholder is ineligible to participate or elects otherwise, all distributions will be automatically reinvested in additional common shares of the Fund pursuant to the Automatic Dividend Reinvestment Plan (the "Plan"). For U.S. federal income tax purposes, all dividends are generally taxable whether a shareholder takes them in cash or they are reinvested pursuant to the Plan in additional shares of the Fund. Distributions of investment company taxable income, which includes net investment income, net short-term capital gain in excess of net long-term capital loss and certain net foreign exchange gains, are generally taxable as ordinary income to the extent of the Fund's current and accumulated earnings and profits. Under Section 1(h)(11) of the Code, for taxable years beginning on or before December 31, 2008, qualified dividend income received by non corporate shareholders is taxed at rates equivalent to long-term capital gain tax rates, which reach a maximum of 15%. "Qualified dividend income" generally includes dividends from certain domestic corporations and dividends from "qualified foreign corporations", although dividends paid by REITs will not generally be eligible to qualify as qualified dividend income. For these purposes, a "qualified foreign corporation" is a foreign corporation (i) that is incorporated in a possession of the United States or is eligible for benefits under a qualifying income tax treaty with the United States, or (ii) whose stock with respect to which such dividend is paid is readily tradable on an established securities market in the United States. A qualified foreign corporation does not include a foreign corporation which for the taxable year of the corporation in which the dividend was paid, or the preceding taxable year, is a "foreign personal holding company," a "foreign investment company," or a "passive foreign investment company," as defined in the Code. The Fund generally can pass the tax treatment of qualified dividend income it receives through to Fund shareholders to the extent of the aggregate dividends received by the Fund. For the Fund to receive qualified dividend income, the Fund must meet certain holding period requirements for the stock on which the otherwise qualified

S-36

dividend is paid. In addition, the Fund cannot be obligated to make payments (pursuant to a short sale or otherwise) with respect to substantially similar or related property. If the Fund lends portfolio securities, amounts received by the Fund that is the equivalent of the dividends paid by the issuer on the securities loaned will not be eligible for qualified dividend income treatment. The same provisions, including the holding period requirements, apply to each shareholder's investment in the Fund. After December 31, 2008, "qualified dividend income" will no longer be taxed at the rates applicable to long-term capital gains, but rather will be taxed at ordinary income tax rates which can reach a maximum rate of 35%, unless Congress enacts legislation providing otherwise. Distributions of net capital gain, if any, are taxable as long-term capital gains for U.S. federal income tax purposes without regard to the length of time the shareholder has held shares of the Fund. A distribution of an amount in excess of the Fund's current and accumulated earnings and profits, if any, will be treated by a shareholder as a tax-free return of capital which is applied against and reduces the shareholder's basis in his or her shares. To the extent that the amount of any such distribution exceeds the shareholder's basis in his or her shares, the excess will be treated by the shareholder as gain from the sale or exchange of shares. The U.S. federal income tax status of all distributions will be designated by the Fund and reported to the shareholders annually.

If a shareholder's distributions are automatically reinvested pursuant to the Plan and the Plan Agent invests the distribution in shares acquired on behalf of the shareholder in open-market purchases, for U.S. federal income tax purposes, the shareholder will be treated as having received a taxable distribution in the amount of the cash dividend that the shareholder would have received if the shareholder had elected to receive cash. If a shareholder's distributions are automatically reinvested pursuant to the Plan and the Plan Agent invests the distribution in newly issued shares of the Fund, the shareholder will be treated as receiving a taxable distribution equal to the fair market value of the stock the shareholder receives.

If the Fund retains any net capital gain, the Fund may designate the retained amount as undistributed capital gains in a notice to shareholders who, if subject to U.S. federal income tax on long-term capital gains, (i) will be required to include in income, as long-term capital gain, their proportionate share of such undistributed amount, and (ii) will be entitled to credit their proportionate share of the tax paid by the Fund on the undistributed amount against their U.S. federal income tax liabilities, if any, and to claim refunds to the extent the credit exceeds such liabilities. For U.S. federal income tax purposes, the tax basis of shares owned by a shareholder of the Fund will be increased by the difference between the amount of undistributed net capital gain included in the shareholder's gross income and the tax deemed paid by the shareholders.

Any dividend declared by the Fund in October, November or December with a record date in such a month and paid during the following January will be treated for U.S. federal income tax purposes as paid by the Fund and received by shareholders on December 31 of the calendar year in which it is declared.

Foreign exchange gains and losses realized by the Fund in connection with certain transactions involving foreign currency-denominated debt securities, certain options and futures contracts relating to foreign currency, foreign currency forward contracts, foreign currencies, or payables or receivables denominated in a foreign currency are subject to Section 988 of the Code, which generally causes such gain and loss to be treated as ordinary income and loss and may affect the amount, timing and character of distributions to shareholders.

If the Fund acquires any equity interest (generally including not only stock but also an option to acquire stock such as is inherent in a convertible bond) in certain foreign corporations that receive at least 75% of their annual gross income from passive sources (such as interest, dividends, certain rents and royalties, or capital gains) or that hold at least 50% of their assets in investments producing such passive

S-37

income ("passive foreign investment companies"), the Fund could be subject to U.S. federal income tax and additional interest charges on "excess distributions" received from such companies or on gain from the sale of stock in such companies, even if all income or gain actually received by the Fund is timely distributed to its shareholders. The Fund would not be able to pass through to its shareholders any credit or deduction for such a tax. An election may generally be available that would ameliorate these adverse tax consequences, but any such election could require the Fund to recognize taxable income or gain (subject to tax distribution requirements) without the concurrent receipt of cash and would also require the foreign corporation to provide the Fund with certain information necessary for such treatment, which such foreign corporation may or may not provide. These investments could also result in the treatment of associated capital gains as ordinary income. The Fund may limit and/or manage its holdings in passive foreign investment companies to limit its tax liability or maximize its return from these investments.

The Fund may invest to a significant extent in debt obligations that are in the lowest rating categories or are unrated, including debt obligations of issuers not currently paying interest or who are in default. Investments in debt obligations that are at risk of or in default present special tax issues for the Fund. Tax rules are not entirely clear about issues such as when the Fund may cease to accrue interest, original issue discount or market discount, when and to what extent deductions may be taken for bad debts or worthless securities and how payments received on obligations in default should be allocated between principal and income. These and other related issues will be addressed by the Fund when, as and if it invests in such securities, in order to seek to ensure that it distributes sufficient income to preserve its status as a regulated investment company and does not become subject to U.S. federal income or excise taxes.

If the Fund utilizes leverage through borrowing, asset coverage limitations imposed by the 1940 Act as well as additional restrictions that may be imposed by certain lenders on the payment of dividends or distributions could potentially limit or eliminate the Fund's ability to make distributions on its common shares until the asset coverage is restored. These limitations could prevent the Fund from distributing at least 90% of its investment company taxable income as is required under the Code and therefore might jeopardize the Fund's qualification for the reduced rates of corporate tax applicable to regulated investment companies and/or might subject the Fund to the nondeductible 4% federal excise tax. Upon any failure to meet the asset coverage requirements imposed by the 1940 Act, the Fund may, in its sole discretion and to the extent permitted under the 1940 Act, purchase or redeem shares of preferred stock in order to maintain or restore the requisite asset coverage and avoid the adverse consequences to the Fund and its shareholders of failing to meet the distribution requirements. There can be no assurance, however, that any such action would achieve these objectives. The Fund will endeavor to avoid restrictions on its ability to distribute dividends.

If the Fund invests in certain pay-in-kind securities, zero coupon securities, deferred interest securities or, in general, any other securities with original issue discount (or with market discount if the Fund elects to include market discount in income currently), the Fund must accrue income on such investments for each taxable year, which generally will be prior to the receipt of the corresponding cash payments. However, the Fund must distribute, at least annually, all or substantially all of its net income, including such accrued income, to shareholders to avoid U.S. federal income and excise taxes. Therefore, the Fund may have to dispose of its portfolio securities under disadvantageous circumstances to generate cash, or may have to leverage itself by borrowing the cash, to satisfy distribution requirements.

At the time of an investor's purchase of the Fund's shares, a portion of the purchase price may be attributable to realized or unrealized appreciation in the Fund's portfolio or undistributed taxable income of the Fund. Consequently, subsequent distributions by the Fund with respect to these shares from such appreciation or income may be taxable to such investor even if the net asset value of the investor's shares is, as a result of the distributions, reduced below the investor's cost for such shares and the distributions

S-38

economically represent a return of a portion of the investment. Sales and other dispositions of the Fund's shares generally are taxable events for shareholders that are subject to tax. Shareholders should consult their own tax advisors regarding their individual circumstances to determine whether any particular transaction in the Fund's shares is properly treated as a sale or exchange for tax purposes (as the following discussion assumes) and the tax treatment of any gains or losses recognized in such transactions. Generally, gain or loss will be equal to the difference between the amount of cash and the fair market value of other property realized and the shareholder's adjusted tax basis in the shares sold or exchanged. In general, any gain or loss realized upon a taxable disposition of shares will be treated as long-term capital gain or loss if the shares have been held for more than one year. Otherwise, the gain or loss on the taxable disposition of the Fund's shares will be treated as short-term capital gain or loss. However, any loss realized by a shareholder upon the sale or other disposition of shares with a tax holding period of six months or less will be treated as a long-term capital loss to the extent of any amounts treated as distributions of long-term capital gain with respect to such shares. Long-term capital gain rates applicable to noncorporate shareholders have been reduced--in general, to 15% with lower rates applying to taxpayers in the 10% and 15% rate brackets--for taxable years beginning on or before December 31, 2008. After December 31, 2008, the maximum noncorporate tax rate on long term capital gains will increase to 20%, unless Congress enacts legislation providing otherwise. The availability to deduct capital losses may be subject to limitations. In addition, losses on sales or other dispositions of shares may be disallowed under "wash sale" rules in the event a shareholder acquires substantially identical shares (including those made pursuant to reinvestment of dividends) within a period of 61 days beginning 30 days before and ending 30 days after a sale or other disposition of shares. In such a case, the disallowed portion of any loss generally would be included in the U.S. federal tax basis of the shares acquired.

From time to time the Fund may repurchase its shares. Shareholders who tender all shares held, or considered to be held, by them will be treated as having sold their shares and generally will realize a capital gain or loss. If a shareholder tenders fewer than all of its shares, such shareholder may be treated as having received a taxable dividend upon he tender of its shares. In such a case, there is a remote risk that non-tendering shareholders will be treated as having received taxable distributions from the Fund. To the extent that the Fund recognizes net gains on the liquidation of portfolio securities to meet such tenders of shares, the Fund will be required to make additional distributions to its shareholders.

The Fund may engage in various transactions utilizing options, futures contracts, forward contracts, hedge instruments, straddles, and other similar transactions. Such transactions may be subject to special provisions of the Code that, among other things, affect the character of any income realized by the Fund from such investments, accelerate recognition of income to the Fund, defer Fund losses, and affect the determination of whether capital gain and loss is characterized as long-term or short-term capital gain or loss. These rules could therefore affect the character, amount and timing of distributions to shareholders. These provisions may also require the Fund to mark-to-market certain types of the positions in its portfolio (i.e., treat them as if they were closed out), which may cause the Fund to recognize income without receiving cash with which to make distributions in amounts necessary to satisfy the distribution requirements for avoiding U.S. federal income and excise taxes. The Fund will monitor its transactions, will make the appropriate tax elections, and will make the appropriate entries in its books and records when it acquires an option, futures contract, forward contract, hedge instrument or other similar investment in order to mitigate the effect of these rules, prevent disqualification of the Fund as a regulated investment company and minimize the imposition of U.S. federal income and excise taxes.

Certain distributions by the Fund may qualify for the dividends received deduction available to corporate shareholders, subject to certain holding period and other requirements, but generally only to the extent the Fund earned dividend income from stock investments in U.S. domestic corporations (other than REITs).

S-39

The IRS has taken the position that if a regulated investment company has two classes of shares, it must designate distributions made to each class in any year as consisting of no more than such class's proportionate share of particular types of income (e.g., dividends qualifying for the dividends received deduction, "qualified dividend income," ordinary income and net capital gains). Consequently, if both common shares and preferred shares are outstanding, the Fund intends to designate distributions made to each class of particular types of income in accordance with each class' proportionate shares of such income. Thus, the Fund will designate dividends qualifying for the corporate dividends received deduction, "qualified dividend income," ordinary income and net capital gains in a manner that allocates such income between the holders of common shares and preferred shares in proportion to the total dividends made to each class during or for the taxable year, or otherwise as required by applicable law. However, for purposes of determining whether distributions are out of the Fund's current or accumulated earnings and profits, the Fund's earnings and profits will be allocated first t o the Fund's preferred shares, if any, and then to the Fund's common shares. In such a case, since the Fund's current and accumulated earnings and profits will first be used to pay dividends on the preferred shares, distributions in excess of such earnings and profits, if any, will be made disproportionately to holders of common shares.

The Fund may invest in REITs that hold residual interests in real estate mortgage investment conduits ("REMICs"). Under Treasury regulations that have not yet been issued, but may apply retroactively, a portion of the Fund's income from a REIT that is attributable to the REIT's residual interest in a REMIC (referred to in the Code as an "excess inclusion") will be subject to federal income tax in all events. These regulations are also expected to provide that excess inclusion income of a regulated investment company, such as the Fund, will be allocated to shareholders of the regulated investment company in proportion to the dividends received by such shareholders, with the same consequences as if the shareholders held the related REMIC residual interest directly. In general, excess inclusion income allocated to shareholders (i) cannot be offset by net operating losses (subject to a limited exception for certain thrift institutions), (ii) will constitute unrelated business taxable income to entities (including a qualified pension plan, an individual retirement account, a 401(k) plan, a Keogh plan or other tax-exempt entity) subject to tax on unrelated business income, thereby potentially requiring such an entity that is allocated excess inclusion income, and otherwise might not be required to file a tax return, to file a tax return and pay tax on such income, and (iii) in the case of a foreign shareholder, will not qualify for any reduction in U.S. federal withholding tax. In addition, if at any time during any taxable year a "disqualified organization" (as defined in the Code) is a record holder of a share in a regulated investment company, then the regulated investment company will be subject to a tax equal to that portion of its excess inclusion income for the taxable year that is allocable to the disqualified organization, multiplied by the highest federal income tax rate imposed on corporations. The Fund does not intend to invest in REITs in which a substantial portion of the assets will consist of residual interests in REMICs.

The Fund may be subject to withholding and other taxes imposed by foreign countries, including taxes on interest, dividends and capital gains with respect to its investments in those countries, which would, if imposed, reduce the yield on or return from those investments. Tax treaties between certain countries and the U.S. may reduce or eliminate such taxes in some cases. The Fund does not expect to satisfy the requirements for passing through to its shareholders their pro rata shares of qualified foreign taxes paid by the Fund, with the result that shareholders will not include such taxes in their gross incomes and will not be entitled to a tax deduction or credit for such taxes on their own tax returns.

Federal law requires that the Fund withhold, as "backup withholding," 28% of reportable payments, including dividends, capital gain distributions and the proceeds of sales or other dispositions of the Fund's shares paid to shareholders who have not complied with IRS regulations. In order to avoid this withholding requirement, shareholders must certify on their Account Applications, or on a separate IRS Form W-9, that the Social Security Number or other Taxpayer Identification Number they provide is their correct number and that they are not currently subject to backup withholding, or that they are exempt

S-40

from backup withholding. The Fund may nevertheless be required to withhold if it receives notice from the IRS or a broker that the number provided is incorrect or backup withholding is applicable as a result of previous underreporting of interest or dividend income. Backup withholding is not an additional tax. Any amount withheld may be allowed as a refund or a credit against the shareholder's U.S. federal income tax liability if the appropriate information (such as the filing of a tax return) is provided to the IRS.

Under Treasury regulations, if a shareholder recognizes a loss with respect to shares of $2 million or more in a single taxable year (or $4 million or more in any combination of taxable years) for an individual shareholder, S corporation or trust or $10 million or more in a single taxable year (or $20 million or more in any combination of years) for a shareholder who is a C corporation, such shareholder will generally be required to file with the IRS a disclosure statement on Form 8886. Direct shareholders of portfolio securities are generally excepted from this reporting requirement, but under current guidance, shareholders of a regulated investment company are not excepted. Future guidance may extend the current exception from this reporting requirement to shareholders of most or all regulated investment companies. The fact that a loss is reportable under these regulations does not affect the legal determination of whether the taxpayer's treatment of the loss is proper. Shareholders should consult their tax advisors to determine the applicability of these regulations in light of their individual circumstances.

The description of certain U.S. federal income tax provisions above relates only to U.S. federal income tax consequences for shareholders who are U.S. persons (i.e., U.S. citizens or residents or U.S. corporations, partnerships, trusts or estates). Investors other than U.S. persons may be subject to different U.S. tax treatment, including a non-resident alien U.S. withholding tax at the rate of 30% or at a lower treaty rate on amounts treated as ordinary dividends from the Fund provided a valid and effective IRS Form W-8BEN is on file with the Fund. SHAREHOLDERS SHOULD CONSULT THEIR OWN TAX
ADVISORS ON THESE MATTERS AND ON ANY SPECIFIC QUESTION OF U.S. FEDERAL, STATE, LOCAL, FOREIGN AND OTHER APPLICABLE TAX LAWS BEFORE MAKING AN INVESTMENT IN THE FUND.

EXPERTS

The financial statements of the Fund as of ________ __, 2004 appearing in this statement of additional information have been audited by Deloitte & Touche LLP, 2 Prudential Plaza, 180 N. Stetson, Chicago, Illinois, 60601, independent auditors, as set forth in their report thereon appearing elsewhere herein, and is included in reliance upon such report given upon the authority of such firm as experts in accounting and auditing.

ADDITIONAL INFORMATION

A Registration Statement on Form N-2, including amendments thereto, relating to the shares offered hereby, has been filed by the Fund with the Commission, Washington, D.C. The prospectus and this statement of additional information do not contain all of the information set forth in the Registration Statement, including any exhibits and schedules thereto. For further information with respect to the Fund and the shares offered hereby, reference is made to the Registration Statement. Statements contained in the prospectus and this statement of additional information as to the contents of any contract or other document referred to are not necessarily complete and in each instance reference is made to the copy of such contract or other document filed as an exhibit to the Registration Statement, each such statement being qualified in all respects by such reference. A copy of the Registration Statement may be inspected without charge at the Commission's principal office in Washington, D.C., and copies of all or any part thereof may be obtained from the Commission upon the payment of certain fees prescribed by the Commission.

S-41

APPENDIX A--DESCRIPTION OF RATINGS(1)

MOODY'S PRIME RATING SYSTEM

Moody's short-term ratings are opinions of the ability of issuers to honor senior financial obligations and contracts. Such obligations generally have an original maturity not exceeding one year, unless explicitly noted.

Moody's employs the following designations, all judged to be investment grade, to indicate the relative repayment ability of rated issuers:

Prime-1: Issuers rated Prime-1 (or supporting institutions) have a superior ability for repayment of senior short-term debt obligations. Prime-1 repayment ability will often be evidenced by many of the following characteristics:

Leading market positions in well-established industries. High rates of return on funds employed. Conservative capitalization structure with moderate reliance on debt and ample asset protection. Broad margins in earnings coverage of fixed financial charges and high internal cash generation. Well-established access to a range of financial markets and assured sources of alternate liquidity.

Prime-2: Issuers (or supporting institutions) rated Prime-2 have a strong ability to repay senior short-term debt obligations. This will normally be evidenced by many of the characteristics cited above, but to a lesser degree. Earnings trends and coverage ratios, while sound, may be more subject to variation than is the case for Prime-2 securities. Capitalization characteristics, while still appropriate, may be more affected by external conditions. Ample alternate liquidity is maintained.

Prime-3: Issuers (or supporting institutions) rated Prime-3 have an acceptable ability for repayment of senior short-term obligations. The effect of industry characteristics and market compositions may be more pronounced. Variability in earnings and profitability may result in changes in the level of debt-protection measurements and may require relatively high financial leverage. Adequate alternate liquidity is maintained.

Not Prime: Issuers rated Not Prime do not fall within any of the Prime rating categories.

In addition, in certain countries the prime rating may be modified by the issuer's or guarantor's senior unsecured long-term debt rating.

MOODY'S DEBT RATINGS

AAA: Bonds and preferred stock which are rated Aaa are judged to be of the best quality. They carry the smallest degree of investment risk and are generally referred to as "gilt edged." Interest payments are protected by a large or by an exceptionally stable margin and principal is secure. While the various protective elements are likely to change, such changes as can be visualized are most unlikely to impair the fundamentally strong position of such issues.


(1) The ratings indicated herein are believed to be the most recent ratings available at the date of this prospectus for the securities listed. Ratings are generally given to securities at the time of issuance. While the rating agencies may from time to time revise such ratings, they undertake no obligation to do so, and the ratings indicated do not necessarily represent ratings which will be given to these securities on the date of the fund's fiscal year-end.

A-1

AA: Bonds and preferred stock which are rated Aa are judged to be of high quality by all standards. Together with the Aaa group they comprise what are generally known as high-grade bonds.

They are rated lower than the best bonds because margins of protection may not be as large as in Aaa securities or fluctuation of protective elements may be of greater amplitude or there may be other elements present which make the long-term risk appear somewhat larger than the Aaa securities.

A: Bonds and preferred stock which are rated A possess many favorable investment attributes and are to be considered as upper-medium-grade obligations. Factors giving security to principal and interest are considered adequate, but elements may be present which suggest a susceptibility to impairment some time in the future.

BAA: Bonds and preferred stock which are rated Baa are considered as medium-grade obligations (i.e., they are neither highly protected nor poorly secured). Interest payments and principal security appear adequate for the present but certain protective elements may be lacking or may be characteristically unreliable over any great length of time. Such bonds lack outstanding investment characteristics and in fact have speculative characteristics as well.

BA: Bonds and preferred stock which are rated Ba are judged to have speculative elements; their future cannot be considered as well-assured. Often the protection of interest and principal payments may be very moderate, and thereby not well safeguarded during both good and bad times over the future. Uncertainty of position characterizes bonds in this class.

B: Bonds and preferred stock which are rated B generally lack characteristics of the desirable investment. Assurance of interest and principal payments or of maintenance of other terms of the contract over any long period of time may be small.

CAA: Bonds and preferred stock which are rated Caa are of poor standing. Such issues may be in default or there may be present elements of danger with respect to principal or interest.

CA: Bonds and preferred stock which are rated Ca represent obligations which are speculative in a high degree. Such issues are often in default or have other marked shortcomings.

C: Bonds and preferred stock which are rated C are the lowest rated class of bonds, and issues so rated can be regarded as having extremely poor prospects of ever attaining any real investment standing.

Moody's assigns ratings to individual debt securities issued from medium-term note (MTN) programs, in addition to indicating ratings to MTN programs themselves. Notes issued under MTN programs with such indicated ratings are rated at issuance at the rating applicable to all pari passu notes issued under the same program, at the program's relevant indicated rating, provided such notes do not exhibit any of the characteristics listed below. For notes with any of the following characteristics, the rating of the individual note may differ from the indicated rating of the program:

1) Notes containing features which link the cash flow and/or market value to the credit performance of any third party or parties.

2) Notes allowing for negative coupons, or negative principal.

3) Notes containing any provision which could obligate the investor to make any additional payments.

A-2

Market participants must determine whether any particular note is rated, and if so, at what rating level.

Note: Moody's applies numerical modifiers 1, 2, and 3 in each generic rating classification from Aa through Caa. The modifier 1 indicates that the obligation ranks in the higher end of its generic rating category; the modifier 2 indicates a mid-range ranking; and the modifier 3 indicates a ranking in the lower end of that generic rating category.

STANDARD & POOR'S SHORT-TERM ISSUE CREDIT RATINGS

A-1: A short-term obligation rated A-1 is rated in the highest category by Standard & Poor's. The obligor's capacity to meet its financial commitment on the obligation is strong. Within this category, certain obligations are designated with a plus sign (+). This indicates that the obligor's capacity to meet its financial commitment on these obligations is extremely strong.

A-2: A short-term obligation rated A-2 is somewhat more susceptible to the adverse effects of changes in circumstances and economic conditions than obligations in higher rating categories. However, the obligor's capacity to meet its financial commitment on the obligation is satisfactory.

A-3: A short-term obligation rated A-3 exhibits adequate protection parameters. However, adverse economic conditions or changing circumstances are more likely to lead to a weakened capacity of the obligor to meet its financial commitment on the obligation.

B: A short-term obligation rated B is regarded as having significant speculative characteristics. The obligor currently has the capacity to meet its financial commitment on the obligation; however, it faces major ongoing uncertainties which could lead to the obligor's inadequate capacity to meet its financial commitment on the obligation.

C: A short-term obligation rated C is currently vulnerable to nonpayment and is dependent upon favorable business, financial, and economic conditions for the obligor to meet its financial commitment on the obligation.

D: A short-term obligation rated D is in payment default. The D rating category is used when payments on an obligation are not made on the date due even if the applicable grace period has not expired, unless Standard & Poor's believes that such payments will be made during such grace period. The D rating also will be used upon the filing of a bankruptcy petition or the taking of a similar action if payments on an obligation are jeopardized.

STANDARD & POOR'S LONG-TERM ISSUE CREDIT RATINGS

Issue credit ratings are based, in varying degrees, on the following considerations:

- Likelihood of payment-capacity and willingness of the obligor to meet its financial commitment on an obligation in accordance with the terms of the obligation;

- Nature of and provisions of the obligation;

- Protection afforded by, and relative position of, the obligation in the event of bankruptcy, reorganization, or other arrangement under the laws of bankruptcy and other laws affecting creditors' rights.

A-3

The issue rating definitions are expressed in terms of default risk. As such, they pertain to senior obligations of an entity. Junior obligations are typically rated lower than senior obligations, to reflect the lower priority in bankruptcy, as noted above. (Such differentiation applies when an entity has both senior and subordinated obligations, secured and unsecured obligations, or operating company and holding company obligations.) Accordingly, in the case of junior debt, the rating may not conform exactly with the category definition.

AAA: An obligation rated AAA has the highest rating assigned by Standard & Poor's. The obligor's capacity to meet its financial commitment on the obligation is extremely strong.

AA: An obligation rated AA differs from the highest rated obligations only in small degree. The obligor's capacity to meet its financial commitment on the obligation is very strong.

A: An obligation rated A is somewhat more susceptible to the adverse effects of changes in circumstances and economic conditions than obligations in higher rated categories. However, the obligor's capacity to meet its financial commitment on the obligation is still strong.

BBB: An obligation rated BBB exhibits adequate protection parameters. However, adverse economic conditions or changing circumstances are more likely to lead to a weakened capacity of the obligor to meet its financial commitment on the obligation.

Obligations rated BB, B, CCC, CC, and C are regarded as having significant speculative characteristics. BB indicates the least degree of speculation and C the highest. While such obligations will likely have some quality and protective characteristics, these may be outweighed by large uncertainties or major exposures to adverse conditions.

BB: An obligation rated BB is less vulnerable to nonpayment than other speculative issues. However, it faces major ongoing uncertainties or exposure to adverse business, financial, or economic conditions which could lead to the obligor's inadequate capacity to meet its financial commitment on the obligation.

B: An obligation rated B is more vulnerable to nonpayment than obligations rated BB, but the obligor currently has the capacity to meet its financial commitment on the obligation. Adverse business, financial, or economic conditions will likely impair the obligor's capacity or willingness to meet its financial commitment on the obligation.

CCC: An obligation rated CCC is currently vulnerable to nonpayment, and is dependent upon favorable business, financial, and economic conditions for the obligor to meet its financial commitment on the obligation. In the event of adverse business, financial, or economic conditions, the obligor is not likely to have the capacity to meet its financial commitment on the obligation.

CC: An obligation rated CC is currently highly vulnerable to nonpayment.

C: A subordinated debt or preferred stock obligation rated C is CURRENTLY HIGHLY VULNERABLE to nonpayment. The C rating may be used to cover a situation where a bankruptcy petition has been filed or similar action taken, but payments on this obligation are being continued. A C also will be assigned to a preferred stock issue in arrears on dividends or sinking fund payments, but that is currently paying.

D: An obligation rated D is in payment default. The D rating category is used when payments on an obligation are not made on the date due even if the applicable grace period has not expired, unless Standard & Poor's believes that such payments will be made during such grace period. The D rating also

A-4

will be used upon the filing of a bankruptcy petition or the taking of a similar action if payments on an obligation are jeopardized.

Plus (+) or Minus (-): The ratings from AA to CCC may be modified by the addition of a plus or minus sign to show relative standing within the major rating categories.

R: This symbol is attached to the ratings of instruments with significant noncredit risks. It highlights risks to principal or volatility of expected returns which are not addressed in the credit rating.

N.R.: This indicates that no rating has been requested, that there is insufficient information on which to base a rating, or that Standard & Poor's does not rate a particular obligation as a matter of policy.

LOCAL CURRENCY AND FOREIGN CURRENCY RISKS

Country risk considerations are a standard part of Standard & Poor's analysis for credit ratings on any issuer or issue. Currency of repayment is a key factor in this analysis. An obligor's capacity to repay foreign currency obligations may be lower than its capacity to repay obligations in its local currency due to the sovereign government's own relatively lower capacity to repay external versus domestic debt. These sovereign risk considerations are incorporated in the debt ratings assigned to specific issues. Foreign currency issuer ratings are also distinguished from local currency issuer ratings to identify those instances where sovereign risks make them different for the same issuer.

A-5

PART C -- OTHER INFORMATION

ITEM 24: FINANCIAL STATEMENTS AND EXHIBITS

1. Financial Statements:

The Registrant's [statement of assets and liabilities (balance sheet)] dated _________ __, 2004, notes to that financial statement and report of independent public accountants thereon will be filed with a pre-effective amendment to the Registrant's Registration Statement.

2. Exhibits:

a.1. Agreement and Declaration of Trust. (*)
a.2. Certificate of Trust. (*)
b. By-laws. (*)
c. None.
d. Form of Share Certificate. (**)
e. Terms and Conditions of the Dividend Reinvestment Plan. (**)
f. None.
g. Investment Management Agreement with Calamos Asset Management, Inc. (**)
h.1. Form of Underwriting Agreement. (**)
h.2. Form of Standard Dealer Agreement. (**)
h.3. Master Agreement Among Underwriters. (**)
i. None.
j.1. Form of Custody Agreement. (**)
j.2. Form of Foreign Custody Merger Agreement. (**)
k. Form of Stock Transfer Agency Agreement. (**)
l.1. Opinion of Vedder, Price, Kaufman & Kammholz. (**)
l.2. Opinion of Morris, Nichols, Arsht & Tunnell. (**)
m. None.
n. Consent of Auditors. (**)
o. Not applicable.
p. Subscription Agreement. (**)
q. None.
r.1. Code of Ethics. (**)
s. Powers of Attorney (*)


(*) Filed herewith.
(**) To be filed by amendment.

C-1

ITEM 25: MARKETING ARRANGEMENTS

Reference will be made to the underwriting agreement for the Registrant's shares of beneficial interest to be filed in an amendment to the Registrant's Registration Statement.

ITEM 26: OTHER EXPENSES AND DISTRIBUTION

The following table sets forth the estimated expenses to be incurred in connection with the offering described in this Registration Statement:

Registration fees..................................   $        *
New York Stock Exchange listing fee................            *
Printing (other than certificates).................            *
Engraving and printing certificates................            *
Accounting fees and expenses.......................            *
Legal fees and expenses............................            *
NASD fee...........................................            *
Miscellaneous......................................            *
                                                      ----------
Total..............................................   $        *
                                                      ==========


* To be completed by amendment.

ITEM 27. PERSONS CONTROLLED BY OR UNDER COMMON CONTROL

None.

ITEM 28. NUMBER OF HOLDERS OF SECURITIES

As of ____________ __, 2004, the number or record holders of each class

of securities of the Registrant was

               TITLE OF CLASS                   NUMBER OF RECORD HOLDERS
               --------------                   ------------------------
   Common Shares (no par value)..........                  --

ITEM 29. INDEMNIFICATION

The Registrant's Agreement and Declaration of Trust (the "Declaration"), dated March 12, 2004, provides that every person who is, or has been, a Trustee or an officer, employee or agent of the Registrant (including any individual who serves at its request as director, officer, partner, employee, Trustee, agent or the like of another organization in which it has any interest as a shareholder, creditor or otherwise ("Covered Person") shall be indemnified by the Registrant or the appropriate series of the Registrant to the fullest extent permitted by law against liability and against all expenses reasonably incurred or paid by him in connection with any claim, action, suit or proceeding in which he becomes involved as a party or otherwise by virtue of his being or having been a Covered Person and against amounts paid or incurred by him in the settlement thereof; provided that no indemnification shall be provided to a Covered Person (i) who shall have been adjudicated by a court or body before which the proceeding was brought (A) to be liable to the Registrant or its shareholders by reason of willful misfeasance, bad faith, gross negligence or reckless disregard of the duties involved in the conduct of his office, or (B) not to have acted in good faith and in a manner the person reasonably believed to be or not opposed to the best interest of the Registrant; or (ii) in the event of a settlement, unless there has been a determination that such Covered Person did not engage in willful misfeasance, bad faith, gross negligence or reckless disregard of the duties involved in the conduct of his office; (A) by the court or other body

C-2

approving the settlement; (B) by at least a majority of those Trustees who are neither Interested Persons of the Trust nor are parties to the matter based upon a review of readily available facts (as opposed to a full trial-type inquiry);
(C) by written opinion of independent legal counsel based upon a review of readily available facts (as opposed to a full trial-type inquiry) or (D) by a vote of a majority of the Outstanding Shares entitled to vote (excluding any Outstanding Shares owned of record or beneficially by such individual).

The Declaration also provides that if any shareholder or former shareholder of any series of the Registrant shall be held personally liable solely by reason of his being or having been a shareholder and not because of his acts or omissions or for some other reason, the shareholder or former shareholder (or his heirs, executors, administrators or other legal representatives or in the case of any entity, its general successor) shall be entitled out of the assets belonging to the applicable series of the Registrant to be held harmless from and indemnified against all loss and expense arising from such liability. The Registrant, on behalf of its affected series, shall, upon request by such shareholder, assume the defense of any claim made against such shareholder for any act or obligation of the series and satisfy any judgment thereon from the assets of the series.

Insofar as indemnification for liability arising under the Securities Act of 1933, as amended (the "1933 Act"), may be available to Trustees, officers and controlling persons of the Registrant pursuant to the foregoing provisions, or otherwise, the Registrant has been advised that in the opinion of the Commission such indemnification is against public policy as expressed in the 1933 Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the Registrant's expenses incurred or paid by a Trustee, officer or controlling person of the Registrant in the successful defense of any action, suit or proceeding) is asserted by such Trustee, officer or controlling person in connection with the securities being registered, the Registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the 1933 Act and will be governed by the final adjudication of such issue.

ITEM 30. BUSINESS AND OTHER CONNECTIONS OF INVESTMENT ADVISER

The information in the Statement of Additional Information under the caption "Management--Trustees and Officers" is incorporated by reference.

ITEM 31. LOCATION OF ACCOUNTS AND RECORDS

All such accounts, books, and other documents are maintained at the offices of the Registrant, at the offices of the Registrant's investment manager, Calamos Asset Management, Inc., 1111 East Warrenville Road, Naperville, Illinois 60563, at the offices of the custodian, 100 Church Street, New York, New York 10286 or at the offices of the transfer agent, 111 8th Avenue, New York, New York 10011-5201.

ITEM 32. MANAGEMENT SERVICES

Not applicable.

ITEM 33. UNDERTAKINGS

1. The Registrant undertakes to suspend the offering of shares until the prospectus is amended if (1) subsequent to the effective date of its registration statement, the net asset value declines more than ten percent from its net asset value as of the effective date of the registration statement or
(2) the net asset value increases to an amount greater than its net proceeds as stated in the prospectus.

C-3

2. Not applicable.

3. Not applicable.

4. Not applicable.

5. (a) For the purposes of determining any liability under the 1933 Act, the information omitted from the form of prospectus filed as part of a registration statement in reliance upon Rule 430A and contained in the form of prospectus filed by the Registrant under Rule 497(h) under the 1933 Act shall be deemed to be part of the Registration Statement as of the time it was declared effective.

(b) For the purpose of determining any liability under the 1933 Act, each post-effective amendment that contains a form of prospectus shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of the securities at that time shall be deemed to be the initial bona fide offering thereof.

6. The Registrant undertakes to send by first class mail or other means designed to ensure equally prominent delivery within two business days of receipt of a written or oral request the Registrant's statement of additional information.

C-4

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and/or Investment Company Act of 1940, the Registrant has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in this City of Naperville and State of Illinois, on the 31st day of March, 2004.

CALAMOS GLOBAL TOTAL RETURN FUND

By: /s/ John P. Calamos
    --------------------------------------
    John P. Calamos, Trustee and President

Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the date(s) indicated.

/s/ John P. Calamos                 Trustee and President (Principal Executive      March 31, 2004
----------------------------------  Officer)
John P. Calamos

/s/ Patrick Dudasik                 Vice President (Principal Financial and         March 31, 2004
----------------------------------  Accounting Officer)
Patrick Dudasik

Nick P. Calamos*                    Trustee                                         By: /s/ James S. Hamman, Jr.
                                                                                        ------------------------
Joe E. Hanauer*                     Trustee                                             James S. Hamman, Jr.
                                                                                        Attorney-In-Fact
John E. Neal*                       Trustee                                             March 31, 2004

Weston W. Marsh*                    Trustee

William Rybak*                      Trustee

* Original powers of attorney authorizing James S. Hamman, Jr. and John P. Calamos to execute this Registration Statement, and Amendments thereto, for each of the trustees on whose behalf this Registration Statement is filed, have been executed and filed as exhibits herewith.

C-5

EXHIBIT INDEX

EXHIBIT                  DOCUMENT



a.1.          Agreement and Declaration of Trust
a.2.          Certificate of Trust
b.            By-laws
s.            Powers of Attorney


EXHIBIT a.1

CALAMOS GLOBAL TOTAL RETURN FUND

AGREEMENT AND DECLARATION OF TRUST

This AGREEMENT AND DECLARATION OF TRUST is made on March 12, 2004 by the undersigned (together with all other persons from time to time duly elected, qualified and serving as Trustees in accordance with the provisions of Article II hereof, the "Trustees") for the purpose of forming a Delaware statutory trust in accordance with the provisions hereinafter set forth;

NOW, THEREFORE, the Trustees declare that all money and property contributed to the Trust shall be held and managed IN TRUST pursuant to this Agreement and Declaration of Trust.

ARTICLE I

NAME AND DEFINITIONS

Section 1. Name. The name of the Trust created by this Agreement and Declaration of Trust is "Calamos Global Total Return Fund" and the Trustees shall conduct the business of the Trust under that name or any other name or names as they may from time to time determine.

Section 2. Definitions. Unless otherwise provided or required by the context:

(a) "Administrator" means the party, other than the Trust, to the contract described in Article III, Section 3 hereof.

(b) "By-Laws" means the By-Laws of the Trust adopted by the Trustees, as amended from time to time, which By-Laws are expressly herein incorporated by reference as part of the "governing instrument" within the meaning of the Delaware Act.

(c) "Class" means any class of Shares of any Series established and designated under or in accordance with the provisions of Article V.

(d) "Commission," "Interested Person" and "Principal Underwriter" have the meanings provided in the 1940 Act. Except as such term may be otherwise defined by the Trustees in conjunction with the establishment of any Series of Shares, the term "vote of a majority of the shares outstanding and entitled to vote" shall have the same meaning as is assigned to the term "vote of a majority of the outstanding voting securities" in the 1940 Act.

(e) "Covered Person" means a person so defined in Article IV,
Section 2.

(f) "Custodian" means any Person other than the Trust who has custody of any Trust Property as required by Section 17(f) of the 1940 Act, but does not include a system for the central handling of securities described in said Section 17(f).

(g) "Declaration" shall mean this Agreement and Declaration of Trust, as amended or restated from time to time. Reference in this Declaration of Trust to "Declaration,"


"hereof," "herein," and "hereunder" shall be deemed to refer to this Declaration rather than exclusively to the article or section in which such words appear.

(h) "Delaware Act" means the Delaware Statutory Trust Act, 12 Del. C. ss.ss.3801, et seq., as amended from time to time.

(i) "Distributor" means the party or parties, other than the Trust, to the contract described in Article III, Section 1 hereof.

(j) "His" shall include the feminine and neuter, as well as the masculine, genders.

(k) "Investment Adviser" means the party, other than the Trust, to the contract described in Article III, Section 2 hereof.

(l) "Net Asset Value" means the net asset value of each Series of the Trust, determined as provided in Article VI, Section 3.

(m) "Person" means and includes individuals, corporations, partnerships, trusts, associations, joint ventures, estates and other entities, whether or not legal entities, and governments and agencies and political subdivisions, thereof, whether domestic or foreign.

(n) "Securities Act" shall mean the Securities Act of 1933, as amended.

(o) "Series" means a series of Shares established and designated under or in accordance with the provisions of Article V, each of which shall be accounted for and maintained as a separate series or portfolio of the Trust.

(p) "Shareholder" means a record owner of Outstanding Shares;

(q) "Shares" means the equal proportionate transferable units of interest into which the beneficial interest of each Series and Class, as applicable, of the Trust is divided from time to time (including whole Shares and fractions of Shares). "Outstanding Shares" means Shares shown in the books of the Trust or its transfer agent as then issued and outstanding, but does not include Shares which have been repurchased or redeemed by the Trust and which are held in the treasury of the Trust.

(r) "Transfer Agent" means any Person other than the Trust who maintains the Shareholder records of the Trust, such as the list of Shareholders, the number of Shares credited to each account, and the like.

(s) "Trust" means Calamos Global Total Return Fund established hereby, and reference to the Trust, when applicable to one or more Series, refers to that Series.

(t) "Trustee" means each person who has signed this Declaration of Trust, so long as he shall continue in office in accordance with the terms hereof, and all other persons who may from time to time be duly qualified and serving as Trustees in accordance with Article II, in all cases in their capacities as Trustees hereunder.

2

(u) "Trust Property" means any and all property, real or personal, tangible or intangible, which is from time to time owned or held by or for the account of the Trust or any Series or the Trustees on behalf of the Trust or any Series, each and every asset of which shall be allocated and belong to a specific series to the exclusion of all other series.

(v) The "1940 Act" means the Investment Company Act of 1940, as amended from time to time, including the rules and regulations of the Commission thereunder and any order or orders thereunder which may from time to time be applicable to the Trust.

ARTICLE II

THE TRUSTEES

Section 1. Management of the Trust. The business and affairs of the Trust shall be managed by or under the direction of the Trustees, and they shall have all powers necessary or desirable to carry out that responsibility. The Trustees may execute all instruments and take all action they deem necessary or desirable to promote the interests of the Trust. Any determination made by the Trustees in good faith as to what is in the interests of the Trust shall be conclusive. In construing the provisions of this Declaration, the presumption shall be in favor of a grant of power to the Trustees.

Section 2. Powers. The Trustees in all instances shall act as principals, free of the control of the Shareholders. The Trustees shall have full power and authority to take or refrain from taking any action and to execute any contracts and instruments that they may consider necessary or desirable in the management of the Trust. The Trustees shall not in any way be bound or limited by current or future laws or customs applicable to trust investments, but shall have full power and authority to make any investments which they, in their sole discretion, deem proper to accomplish the purposes of the Trust. The Trustees may exercise all of their powers without recourse to any court or other authority. Subject to any applicable limitation herein or in the By-Laws or resolutions of the Trust, the Trustees shall have power and authority, without limitation:

(a) To operate as and carry on the business of an investment company, and exercise all the powers necessary and appropriate to the conduct of such operations.

(b) To invest in, hold for investment, or reinvest in, cash; securities of any type, including, but not limited to, common, preferred and preference stocks; warrants; subscription rights; profit-sharing interests or participations and all other contracts for or evidence of equity interests; bonds, debentures, bills, time notes and all other evidences of indebtedness; negotiable or non-negotiable instruments; government securities, including securities of any state, municipality or other political subdivision thereof, or any governmental or quasi-governmental agency or instrumentality; and money market instruments including bank certificates of deposit, finance paper, commercial paper, bankers' acceptances and all kinds of repurchase agreements, of any corporation, company, trust, association, firm or other business organization however established, and of any country, state, municipality or other political subdivision, or any governmental or quasi-governmental agency or instrumentality; or any other

3

security, property or instrument in which the Trust or any of its Series shall be authorized to invest.

(c) To acquire (by purchase, subscription or otherwise), to hold, to trade in and deal in, to acquire any rights or options to purchase or sell, to sell or otherwise dispose of, to lend and to pledge any such securities, to enter into repurchase agreements, reverse repurchase agreements, firm commitment agreements, forward foreign currency exchange contracts, interest rate mortgage or currency swaps and interest rate caps, floors and collars, to purchase and sell options on securities, securities indices, currency, swaps and other financial assets, futures contracts and options on futures contracts of all descriptions and to engage in all types of hedging, risk-management or income enhancement transactions.

(d) To exercise all rights, powers and privileges of ownership or interest in all securities, repurchase agreements and other assets included in the Trust Property, including the right to vote thereon and otherwise act with respect thereto and to do all acts for the preservation, protection, improvement and enhancement in value of all such securities, repurchase agreements and other assets.

(e) To acquire (by purchase, lease or otherwise) and to hold, use, maintain, develop and dispose of (by sale or otherwise) any property, real or personal, including cash or foreign currency, and any interest therein.

(f) To borrow money or other property in the name of the Trust exclusively for Trust purposes and in this connection issue notes or other evidence of indebtedness; to secure borrowings by mortgaging, pledging or otherwise subjecting as security the Trust Property; and to endorse, guarantee, or undertake the performance of any obligation or engagement of any other Person and to lend Trust Property.

(g) To aid by further investment any corporation, company, trust, association or firm, any obligation of or interest in which is included in the Trust Property or in the affairs of which the Trustees have any direct or indirect interest; to do all acts and things designed to protect, preserve, improve or enhance the value of such obligation or interest; and to guarantee or become surety on any or all of the contracts, stocks, bonds, notes, debentures and other obligations of any such corporation, company, trust, association or firm.

(h) To adopt By-Laws not inconsistent with this Declaration providing for the conduct of the business of the Trust and to amend and repeal them to the extent such right is not reserved to the Shareholders.

(i) To elect and remove with or without cause such officers and appoint and terminate such agents as they deem appropriate.

(j) To employ as custodian of any assets of the Trust, subject to any provisions herein or in the By-Laws, one or more banks, trust companies or companies that are members of a national securities exchange, or other entities permitted by the Commission to serve as such.

4

(k) To retain one or more transfer agents and shareholder servicing agents, or both.

(l) To provide for the distribution of Shares either through a Principal Underwriter as provided herein or by the Trust itself, or both, or pursuant to a distribution plan of any kind.

(m) To set record dates in the manner provided for herein or in the By-Laws.

(n) To delegate such authority as they consider desirable to any officers of the Trust and to any agent, independent contractor, manager, investment adviser, custodian or underwriter.

(o) To hold any security or other property (i) in a form not indicating any trust, whether in bearer, book entry, unregistered or other negotiable form, or (ii) either in the Trust's or Trustees' own name or in the name of a custodian or a nominee or nominees, subject to safeguards according to the usual practice of statutory trusts or investment companies.

(p) To establish separate and distinct Series with separately defined investment objectives and policies and distinct investment purposes, and with separate Shares representing beneficial interests in such Series, and to establish separate Classes, all in accordance with the provisions of Article V.

(q) To the full extent permitted by Section 3804 of the Delaware Act, to allocate assets, liabilities and expenses of the Trust to a particular Series and assets, liabilities and expenses to a particular Class or to apportion the same between or among two or more Series or Classes, provided that any liabilities or expenses incurred by a particular Series or Class shall be payable solely out of the assets belonging to that Series or Class as provided for in Article V, Section 4.

(r) To consent to or participate in any plan for the reorganization, consolidation or merger of any corporation or concern whose securities are held by the Trust; to consent to any contract, lease, mortgage, purchase, or sale of property by such corporation or concern; and to pay calls or subscriptions with respect to any security held in the Trust.

(s) To compromise, arbitrate, or otherwise adjust claims in favor of or against the Trust or any matter in controversy including, but not limited to, claims for taxes.

(t) To make distributions of income, capital gains, returns of capital (if any) and redemption proceeds to Shareholders in the manner hereinafter provided for.

(u) To establish committees for such purposes, with such membership, and with such responsibilities as the Trustees may consider proper, including a committee consisting of fewer than all of the Trustees then in office, which may act for and bind the Trustees and the Trust with respect to the institution, prosecution, dismissal, settlement, review or investigation of any action, suit or proceeding, pending or threatened to be brought before any court, administrative agency or other adjudicatory body.

5

(v) To issue, sell, repurchase, redeem, cancel, retire, acquire, hold, resell, reissue, dispose of and otherwise deal in Shares; to establish terms and conditions regarding the issuance, sale, repurchase, redemption, cancellation, retirement, acquisition, holding, resale, reissuance, disposition of or dealing in Shares; and, subject to Articles V and VI, to apply to any such repurchase, redemption, retirement, cancellation or acquisition of Shares any funds or property of the Trust or of the particular Series with respect to which such Shares are issued.

(w) To invest part or all of the Trust Property (or part or all of the assets of any Series), or to dispose of part or all of the Trust Property (or part or all of the assets of any Series) and invest the proceeds of such disposition, in securities issued by one or more other investment companies registered under the 1940 Act (including investment by means of transfer of part or all of the Trust Property in exchange for an interest or interest in such one or more investment companies) all without any requirement of approval by Shareholders. Any such other investment company may (but need not) be a trust (formed under the laws of any state) which is classified as a partnership for federal income tax purposes.

(x) To sell or exchange any or all of the assets of the Trust, subject to Article IX, Sections 4, 6 and 7.

(y) To enter into joint ventures, partnerships and any other combinations and associations.

(z) To join with other security holders in acting through a committee, depositary, voting trustee or otherwise, and in that connection to deposit any security with, or transfer any security to, any such committee, depositary or trustee, and to delegate to them such power and authority with relation to any security (whether or not so deposited or transferred) as the Trustees shall deem proper, and to agree to pay, and to pay, such portion of the expenses and compensation of such Committee, depositary or trustee as the Trustees shall deem proper.

(aa) To purchase and pay for entirely out of Trust Property such insurance as the Trustees may deem necessary or appropriate for the conduct of the business, including, without limitation, insurance policies insuring the assets of the Trust or payment of distributions and principal on its portfolio investments, and, subject to applicable law and any restrictions set forth in the By-Laws, insurance policies insuring the Shareholders, Trustees, officers, employees, agents, investment advisers, Principal Underwriters, or independent contractors of the Trust, individually, against all claims and liabilities of every nature arising by reason of holding Shares, holding, being or having held any such office or position, or by reason of any action alleged to have been taken or omitted by any such Person as Trustee, officer, employee, agent, investment adviser, Principal Underwriter, or independent contractor, including any action taken or omitted that may be determined to constitute negligence, whether or not the Trust would have the power to indemnify such Person against liability.

(bb) To adopt, establish and carry out pension, profit-sharing, share bonus, share purchase, savings, thrift and other retirement, incentive and benefit plans and trusts, including the purchasing of life insurance and annuity contracts as a means of providing such retirement and other benefits, for any or all of the Trustees, officers, employees and agents of the Trust.

6

(cc) To vote or give assent, or exercise any rights of ownership, with respect to stock or other securities or property; and to execute and deliver proxies or powers of attorneys to such Person or Persons as the Trustees shall deem proper, granting to such Person or Persons such power and discretion with relation to securities and property as the Trustees shall deem proper.

(dd) To enter into contracts of any kind and description.

(ee) To interpret the investment policies, practices or limitations of any Series or Class.

(ff) To guarantee indebtedness and contractual obligations of others.

(gg) To carry on any other business in connection with or incidental to any of the foregoing powers, to do everything necessary or desirable to accomplish any purpose or to further any of the foregoing powers, and to take every other action incidental to the foregoing business or purposes, objects or powers.

The clauses above shall be construed as objects and powers, and the enumeration of specific powers shall not limit in any way the general powers of the Trustees. Any action by one or more of the Trustees in their capacity as such hereunder shall be deemed an action on behalf of the Trust or the applicable Series, and not an action in an individual capacity. No one dealing with the Trustees shall be under any obligation to make any inquiry concerning the authority of the Trustees, or to see to the application of any payments made or property transferred to the Trustees or upon their order. In construing this Declaration, the presumption shall be in favor of a grant of power to the Trustees.

Section 3. Certain Transactions. Except as prohibited by applicable law, the Trustees may, on behalf of the Trust, buy any securities from or sell any securities to, or lend any assets of the Trust to, any Trustee or officer of the Trust or any firm of which any such Trustee or officer is a member acting as principal, or have any such dealings with any investment adviser, administrator, distributor or transfer agent for the Trust or with any Interested Person of such person. The Trust may employ any such person or entity in which such person is an Interested Person, as broker, legal counsel, registrar, investment adviser, administrator, distributor, transfer agent, dividend disbursing agent, custodian or in any other capacity upon customary terms.

Section 4. Initial Trustee(s); Election and Number of Trustees. The initial Trustee(s) shall be the persons initially signing this Declaration. The number of Trustees (other than the initial Trustees) shall be fixed from time to time by a majority of the Trustees then in office; provided, that there shall be at least one (1) Trustee and no more than fifteen (15).

Section 5. Term of Office of Trustees; Classes.

(a) Subject to the voting rights established with respect to a particular Series or Class, each Trustee shall hold office for life or until his successor is elected and duly qualified or the Trust terminates. Notwithstanding the foregoing but subject to the voting rights established with respect to a particular Series or Class, (1) any Trustee may resign by delivering to the other Trustees or to any Trust officer a written resignation effective upon such delivery or

7

a later date specified therein; (2) any Trustee may be removed with cause at any time by a written instrument signed by at least three-quarters of the then Trustees, specifying the effective date of removal; (3) any Trustee who requests to be retired, or who is declared bankrupt or has become physically or mentally incapacitated or is otherwise unable to serve, may be retired by a written instrument signed by a majority of the other Trustees, specifying the effective date of retirement; and (4) any Trustee may be removed, with or without cause, by a vote of at least a majority of the then Trustees if such removal is approved by the holders of at least three-quarters of the Outstanding Shares entitled to vote with respect to the election of such Trustee and present in person or by proxy at a meeting of the Shareholders called for such purpose.

(b) The Board of Trustees shall be divided into three classes, designated Class I, Class II and Class III. Each class shall consist, as nearly as may be possible, of one-third of the total number of trustees constituting the entire Board of Trustees. Within the limits above specified, the number of the Trustees in each class shall be determined by resolution of the Board of Trustees. The term of office of the 1st class shall expire on the date of the 1st annual meeting of Shareholders or special meeting in lieu thereof following the effective date of the Registration Statement relating to the Shares under the Securities Act. The term of the 2nd class shall expire on the date of the 2nd annual meeting of Shareholders or special meeting in lieu thereof following the effective date of the Registration Statement relating to the Shares under the Securities Act. The term of the 3rd class shall expire on the date of the 3rd annual meeting of Shareholders or special meeting in lieu thereof following the effective date of the Registration Statement relating to the Shares under the Securities Act. Upon expiration of the term of office of each class as set forth above, the number of Trustees in such class, as determined by the Board of Trustees, shall be elected for a term expiring on the date of the 3rd annual meeting of Shareholders or special meeting in lieu thereof following such expiration to succeed the Trustees whose terms of office expire. The Trustees shall be elected at an annual meeting of the Shareholders or special meeting in lieu thereof called for that purpose.

Section 6. Vacancies; Appointment of Trustees. Whenever a vacancy shall exist in the Board of Trustees, regardless of the reason for such vacancy, the remaining Trustees shall appoint any person as they determine in their sole discretion to fill that vacancy, consistent with the limitations under the 1940 Act, provided, that if the Shareholders of any Class or Series of Shares are entitled separately to elect one or more Trustees, a majority of the remaining Trustees or the sole remaining Trustee elected by that Class or Series may fill any vacancy among the number of Trustees elected by that Class or Series. Such appointment shall be made by a written instrument signed by a majority of the Trustees or by a resolution of the Trustees, duly adopted and recorded in the records of the Trust, specifying the effective date of the appointment. The Trustees may appoint a new Trustee as provided above in anticipation of a vacancy expected to occur because of the retirement, resignation or removal of a Trustee, or an increase in number of Trustees, provided that such appointment shall become effective only at or after the expected vacancy occurs. As soon as any such Trustee has accepted his appointment in writing, the trust estate shall vest in the new Trustee, together with the continuing Trustees, without any further act or conveyance, and he shall be deemed a Trustee hereunder. The Trustees' power of appointment is subject to Section 16(a) of the 1940 Act. Whenever a vacancy in the number of Trustees shall occur, until such vacancy is filled as provided in this Article II, the Trustees in office, regardless of their number, shall have all the powers granted to the Trustees and shall discharge all the duties imposed upon the Trustees by the Declaration. The death, declination to

8

serve, resignation, retirement, removal or incapacity of one or more Trustees, or all of them, shall not operate to annul the Trust or to revoke any existing agency created pursuant to the terms of this Declaration of Trust.

Section 7. Chairman. The Trustees may appoint one of their number to be Chairman of the Board of Trustees. The Chairman shall preside at all meetings of the Trustees, shall be responsible for the execution of policies established by the Trustees and the administration of the Trust, and may be the chief executive, financial and/or accounting officer of the Trust. If the Trustees do not appoint a Chairman, the President shall perform the duties and have the responsibilities hereunder.

Section 8. Action by the Trustees.

(a) Except as expressly provided in this Agreement, the Trustees shall act by majority vote at a meeting duly called at which a quorum is present, including a meeting held by conference telephone, teleconference or other electronic media or communication equipment by means of which all persons participating in the meeting can communicate with each other; or by written consent of a majority of Trustees (or such greater number as may be required by applicable law) without a meeting. A majority of the Trustees shall constitute a quorum at any meeting. Meetings of the Trustees may be called orally or in writing by the President or by any one of the Trustees or as set forth in the By-Laws. Notice of the time, date and place of all Trustees' meetings shall be given to each Trustee as set forth in the By-Laws; provided, however, that no notice is required if the Trustees provide for regular or stated meetings. Notice need not be given to any Trustee who attends the meeting without objecting to the lack of notice or who signs a waiver of notice either before or after the meeting. Except as expressly provided in this Agreement, the Trustees by majority vote may delegate to any Trustee or Trustees or committee authority to approve particular matters or take particular actions on behalf of the Trust. Any written consent or waiver may be provided and delivered to the Trust by facsimile or other similar electronic mechanism.

(b) A Trustee who with respect to the Trust is not an Interested Person shall be deemed to be independent and disinterested when making any determinations or taking any action as a Trustee, whether pursuant to the 1940 Act, the Delaware Act or otherwise.

Section 9. Ownership of Trust Property. The Trust Property of the Trust and of each Series shall be held separate and apart from any assets now or hereafter held in any capacity other than as Trustee hereunder by the Trustees or any successor Trustees. Legal title in and beneficial ownership of all of the assets of the Trust shall at all times be considered as vested in the Trust, except that the Trustees may cause legal title in and beneficial ownership of any Trust Property to be held by, or in the name of one or more of the Trustees acting for and on behalf of the Trust, or in the name of any person as nominee acting for and on behalf of the Trust. No Shareholder shall be deemed to have a severable ownership in any individual asset of the Trust or of any Series or any right of partition or possession thereof, but each Shareholder shall have, as provided in Article V, a proportionate undivided beneficial interest in the Trust or Series or Class thereof represented by Shares. The Shares shall be personal property giving only the rights specifically set forth in this Trust Instrument. The Trust, or at the determination of the Trustees one or more of the Trustees or a nominee acting for and on behalf of the Trust, shall be deemed

9

to hold legal title and beneficial ownership of any income earned on securities of the Trust issued by any business entities formed, organized, or existing under the laws of any jurisdiction, including the laws of any foreign country. Upon the resignation or removal of a Trustee, or his otherwise ceasing to be a Trustee, he shall execute and deliver such documents as the remaining Trustees shall require for the purpose of conveying to the Trust or the remaining Trustees any Trust Property held in the name of the resigning or removed Trustee. Upon the incapacity or death of any Trustee, his legal representative shall execute and deliver on his behalf such documents as the remaining Trustees shall require as provided in the preceding sentence.

Section 10. Effect of Trustees Not Serving. The death, resignation, retirement, removal, incapacity or inability or refusal to serve of the Trustees, or any one of them, shall not operate to annul the Trust or to revoke any existing agency created pursuant to the terms of this Declaration.

Section 11. Trustees, Etc. as Shareholders. Subject to any restrictions in the By-Laws, any Trustee, officer, agent or independent contractor of the Trust may acquire, own and dispose of Shares to the same extent as any other Shareholder; the Trustees may issue and sell Shares to and buy Shares from any such person or any firm or company in which such Person is interested, subject only to any general limitations herein.

Section 12. Series Trustees. In connection with the establishment of one or more Series or Classes, the Trustees establishing such Series or Class may appoint, to the extent permitted by the Delaware Act, separate Trustees with respect to such Series or Classes (the "Series Trustees"). Series Trustees may, but are not required to, serve as Trustees of the Trust or any other Series or Class of the Trust. The Series Trustees shall have, to the exclusion of any other Trustee of the Trust, all the powers and authorities of Trustees hereunder with respect to such Series or Class, but shall have no power or authority with respect to any other Series or Class. Any provision of this Declaration relating to election of Trustees by Shareholders only shall entitle the Shareholders of a Series or Class for which Series Trustees have been appointed to vote with respect to the election of such Series Trustees and the Shareholders of any other Series or Class shall not be entitled to participate in such vote. In the event that Series Trustees are appointed, the Trustees initially appointing such Series Trustees shall, without the approval of any Outstanding Shares, amend either the Declaration or the By-Laws to provide for the respective responsibilities of the Trustees and the Series Trustees in circumstances where an action of the Trustees or Series Trustees affects all Series of the Trust or two or more Series represented by different Trustees.

ARTICLE III

CONTRACTS WITH SERVICE PROVIDERS

Section 1. Underwriting Contract. The Trustees may in their discretion from time to time enter into an exclusive or non-exclusive underwriting or distribution contract or contracts providing for the sale of the Shares whereby the Trustees may either agree to sell the Shares to the other party to the contract or appoint such other party as their sales agent for the Shares, and in either case on such terms and conditions, if any, as may be prescribed in the By-Laws, and such further terms and conditions as the Trustees may in their discretion determine not

10

inconsistent with the provisions of this Article III or of the By-Laws; and such contract may also provide for the repurchase of the Shares by such other party as agent of the Trustees.

Section 2. Advisory or Management Contract. The Trustees may in their discretion from time to time enter into one or more investment advisory or management contracts or, if the Trustees establish multiple Series, separate investment advisory or management contracts with respect to one or more Series whereby the other party or parties to any such contracts shall undertake to furnish the Trust or such Series management, investment advisory, administration, accounting, legal, statistical and research facilities and services, promotional or marketing activities, and such other facilities and services, if any, as the Trustees shall from time to time consider desirable and all upon such terms and conditions as the Trustees may in their discretion determine. Notwithstanding any provisions of the Declaration, the Trustees may authorize the Investment Adviser(s) or persons to whom the Investment Adviser(s) delegates certain or all of its duties, or any of them, under any such contracts (subject to such general or specific instructions as the Trustees may from time to time adopt) to effect purchases, sales, loans or exchanges of portfolio securities and other investments of the Trust on behalf of the Trustees or may authorize any officer, employee or Trustee to effect such purchases, sales, loans or exchanges pursuant to recommendations of such Investment Adviser(s), or any of them (and all without further action by the Trustees). Any such purchases, sales, loans and exchanges shall be deemed to have been authorized by all of the Trustees.

Section 3. Administration Agreement. The Trustees may in their discretion from time to time enter into an administration agreement or, if the Trustees establish multiple Series or Classes, separate administration agreements with respect to each Series or Class, whereby the other party to such agreement shall undertake to manage the business affairs of the Trust or of a Series or Class thereof of the Trust and furnish the Trust or a Series or a Class thereof with office facilities, and shall be responsible for the ordinary clerical, bookkeeping and recordkeeping services at such office facilities, and other facilities and services, if any, and all upon such terms and conditions as the Trustees may in their discretion determine.

Section 4. Service Agreement. The Trustees may in their discretion from time to time enter into service agreements with respect to one or more Series or Classes of Shares whereby the other parties to such Service Agreements will provide administration and/or support services pursuant to administration plans and service plans, and all upon such terms and conditions as the Trustees in their discretion may determine.

Section 5. Transfer Agent. The Trustees may in their discretion from time to time enter into a transfer agency and shareholder service contract whereby the other party to such contract shall undertake to furnish transfer agency and shareholder services to the Trust. The contract shall have such terms and conditions as the Trustees may in their discretion determine not inconsistent with the Declaration. Such services may be provided by one or more Persons.

Section 6. Custodian. The Trustees may appoint or otherwise engage one or more banks or trust companies or any other entity satisfying the requirements of the 1940 Act, to serve as Custodian with authority as its agent, but subject to such restrictions, limitations and other requirements, if any, as may be contained in the By-Laws of the Trust. The Trustees may also authorize the Custodian to employ one or more sub-custodians, including such foreign banks and

11

securities depositories as meet the requirements of applicable provisions of the 1940 Act, and upon such terms and conditions as may be agreed upon between the Custodian and such sub-custodian, to hold securities and other assets of the Trust and to perform the acts and services of the Custodian, subject to applicable provisions of law and resolutions adopted by the Trustees.

Section 7. Affiliations of Trustees or Officers, Etc. The fact that:
(i) any of the Shareholders, Trustees or officers of the Trust or any Series thereof is a shareholder, director, officer, partner, trustee, employee, manager, adviser or distributor of or for any partnership, corporation, trust, association or other organization or of or for any parent or affiliate of any organization, with which a contract of the character described in this Article III or for services as Custodian, Transfer Agent or disbursing agent or for related services may have been or may hereafter be made, or that any such organization, or any parent or affiliate thereof, is a Shareholder of or has an interest in the Trust, or that (ii) any partnership, corporation, trust, association or other organization with which a contract of the character described in Sections 1, 2, 3 or 4 of this Article III or for services as Custodian, Transfer Agent or disbursing agent or for related services may have been or may hereafter be made also has any one or more of such contracts with one or more other partnerships, corporations, trusts, associations or other organizations, or has other business or interests, shall not affect the validity of any such contract or disqualify any Shareholder, Trustee or officer of the Trust from voting upon or executing the same or create any liability or accountability to the Trust or its Shareholders.

ARTICLE IV

COMPENSATION, LIMITATION OF LIABILITY AND INDEMNIFICATION

Section 1. Compensation. The Trustees as such shall be entitled to reasonable compensation from the Trust, and they may fix the amount of such compensation. Nothing herein shall in any way prevent the employment of any Trustee for advisory, management, legal, accounting, investment banking or other services and payment for the same by the Trust.

Section 2. Limitation of Liability. All persons contracting with or having any claim against the Trust or a particular Series shall look only to the assets of all Series or such particular Series for payment under such contract or claim; and neither the Trustees nor, when acting in such capacity, any of the Trust's officers, employees or agents, whether past, present or future, shall be personally liable therefor. Every written instrument or obligation on behalf of the Trust or any Series shall contain a statement to the foregoing effect, but the absence of such statement shall not operate to make any Trustee or officer of the Trust liable thereunder. Provided they have exercised reasonable care and have acted under the reasonable belief that their actions are in the best interest of the Trust, the Trustees and officers of the Trust shall not be responsible or liable for any act or omission or for neglect or wrongdoing of them or any officer, agent, employee, investment adviser or independent contractor of the Trust, but nothing contained in this Declaration or in the Delaware Act shall protect any Trustee or officer of the Trust against liability to the Trust or to Shareholders to which he would otherwise be subject by reason of willful misfeasance, bad faith, gross negligence or reckless disregard of the duties involved in the conduct of his office.

12

Section 3. Indemnification.

(a) Subject to the exceptions and limitations contained in subsection (b) below:

(i) every person who is, or has been, a Trustee or an officer, employee or agent of the Trust (including any individual who serves at its request as director, officer, partner, employee, trustee, agent or the like of another organization in which it has any interest as a shareholder, creditor or otherwise) ("Covered Person") shall be indemnified by the Trust or the appropriate Series to the fullest extent permitted by law against liability and against all expenses reasonably incurred or paid by him in connection with any claim, action, suit or proceeding in which he becomes involved as a party or otherwise by virtue of his being or having been a Covered Person and against amounts paid or incurred by him in the settlement thereof; and

(ii) as used herein, the words "claim," "action," "suit," or "proceeding" shall apply to all claims, actions, suits or proceedings (civil, criminal, administrative, investigative or other, including appeals), actual or threatened, and the words "liability" and "expenses" shall include, without limitation, attorneys' fees, costs, judgments, amounts paid in settlement, fines, penalties and other liabilities.

(b) No indemnification shall be provided hereunder to a Covered Person:

(i) who shall have been adjudicated by a court or body before which the proceeding was brought (A) to be liable to the Trust or its Shareholders by reason of willful misfeasance, bad faith, gross negligence or reckless disregard of the duties involved in the conduct of his office, or (B) not to have acted in good faith and in a manner the person reasonably believed to be in or not opposed to the best interests of the Trust; or

(ii) in the event of a settlement, unless there has been a determination that such Covered Person did not engage in willful misfeasance, bad faith, gross negligence or reckless disregard of the duties involved in the conduct of his office; (A) by the court or other body approving the settlement; (B) by at least a majority of those Trustees who are neither Interested Persons of the Trust nor are parties to the matter based upon a review of readily available facts (as opposed to a full trial-type inquiry); (C) by written opinion of independent legal counsel based upon a review of readily available facts (as opposed to a full trial-type inquiry) or (D) by a vote of a majority of the Outstanding Shares entitled to vote (excluding any Outstanding Shares owned of record or beneficially by such individual).

(c) The rights of indemnification herein provided may be insured against by policies maintained by the Trust, shall be severable, shall not be exclusive of or affect any other

13

rights to which any Covered Person may now or hereafter be entitled, and shall inure to the benefit of the heirs, executors and administrators of a Covered Person.

(d) To the maximum extent permitted by applicable law, expenses in connection with the preparation and presentation of a defense to any claim, action, suit or proceeding of the character described in subsection (a) of this Section may be paid by the Trust or applicable Series from time to time prior to final disposition thereof upon receipt of an undertaking by or on behalf of such Covered Person that such amount will be paid over by him to the Trust or applicable Series if it is ultimately determined that he is not entitled to indemnification under this Section; provided, however, that either
(i) such Covered Person shall have provided appropriate security for such undertaking, (ii) the Trust is insured against losses arising out of any such advance payments or (iii) either a majority of a quorum of the Trustees who are neither Interested Persons of the Trust nor parties to the matter, or independent legal counsel in a written opinion, shall have determined, based upon a review of readily available facts (as opposed to a full trial-type inquiry) that there is reason to believe that such Covered Person will not be disqualified from indemnification under this Section. Independent counsel retained for the purpose of rendering an opinion regarding advancement of expenses and/or a majority of a quorum of the Trustees who are neither Interested Persons of the Trust nor parties to the matter, may proceed under a rebuttable presumption that the Covered Person has not engaged in willful misfeasance, bad faith, gross negligence or reckless disregard of the Covered Person's duties to the Trust and were based on the Covered Person's determination that those actions were in the best interests of the Trust and its Shareholders; provided that the Covered Person is not an Interested Person (or is an Interested Person solely by reason of being an officer of the Trust).

(e) Any repeal or modification of this Article IV by the Shareholders, or adoption or modification of any other provision of the Declaration or By-Laws inconsistent with this Article, shall be prospective only, to the extent that such repeal, or modification would, if applied retrospectively, adversely affect any limitation on the liability of any Covered Person or indemnification available to any Covered Person with respect to any act or omission which occurred prior to such repeal, modification or adoption. Any such repeal or modification by the Shareholders shall require a vote of at least two-thirds of the Outstanding Shares entitled to vote and present in person or by proxy at any meeting of the Shareholders.

Section 4. Indemnification of Shareholders. If any Shareholder or former Shareholder of any Series shall be held personally liable solely by reason of his being or having been a Shareholder and not because of his acts or omissions or for some other reason, the Shareholder or former Shareholder (or his heirs, executors, administrators or other legal representatives or in the case of any entity, its general successor) shall be entitled out of the assets belonging to the applicable Series to be held harmless from and indemnified against all loss and expense arising from such liability. The Trust, on behalf of the affected Series, shall, upon request by such Shareholder, assume the defense of any claim made against such Shareholder for any act or obligation of the Series and satisfy any judgment thereon from the assets of the Series.

Section 5. No Bond Required of Trustees. No Trustee shall be obligated to give any bond or other security for the performance of any of his duties hereunder.

14

Section 6. No Duty of Investigation; Notice in Trust Instruments, Etc. No purchaser, lender, transfer agent or other Person dealing with the Trustees or any officer, employee or agent of the Trust or a Series thereof shall be bound to make any inquiry concerning the validity of any transaction purporting to be made by the Trustees or by said officer, employee or agent or be liable for the application of money or property paid, loaned, or delivered to or on the order of the Trustees or of said officer, employee or agent. Every obligation, contract, instrument, certificate, Share, other security of the Trust or a Series thereof or undertaking, and every other act or thing whatsoever executed in connection with the Trust shall be conclusively presumed to have been executed or done by the executors thereof only in their capacity as Trustees under this Declaration or in their capacity as officers, employees or agents of the Trust or a Series thereof. Every written obligation, contract, instrument, certificate, Share, other security of the Trust or a Series thereof or undertaking made or issued by the Trustees may recite that the same is executed or made by them not individually, but as Trustees under the Declaration, and that the obligations of the Trust or a Series thereof under any such instrument are not binding upon any of the Trustees or Shareholders individually, but bind only the Trust Property or the Trust Property of the applicable Series, and may contain any further recital which they may deem appropriate, but the omission of such recital shall not operate to bind the Trustees individually. The Trustees may maintain insurance for the protection of the Trust Property or the Trust Property of the applicable Series, its Shareholders, Trustees, officers, employees and agents in such amount as the Trustees shall deem adequate to cover possible tort liability, and such other insurance as the Trustees in their sole judgment shall deem advisable.

Section 7. Reliance on Experts, Etc. Each Trustee, officer or employee of the Trust or a Series thereof shall, in the performance of his duties, powers and discretions hereunder be fully and completely justified and protected with regard to any act or any failure to act resulting from reliance in good faith upon the books of account or other records of the Trust or a Series thereof, upon an opinion of counsel, or upon reports made to the Trust or a Series thereof by any of its officers or employees or by the Investment Adviser, the Administrator, the Distributor, the Principal Underwriter, Transfer Agent, selected dealers, accountants, appraisers or other experts or consultants selected with reasonable care by the Trustees, officers or employees of the Trust, regardless of whether such counsel or expert may also be a Trustee.

ARTICLE V

SERIES; CLASSES; SHARES; OTHER SECURITIES

Section 1. Establishment of Series or Class. The Trust shall consist of one or more Series. Without limiting the authority of the Trustees to establish and designate any further Series or Classes, the Trustees hereby establish a single Series, designated Calamos Global Total Return Fund, and one Class of Shares, designated as the common shares. Each additional Series or Class shall be established and is effective upon the adoption of a resolution of a majority of the Trustees or any alternative date specified in such resolution. Such resolution may establish such additional Series or Classes directly in such resolution or by reference to, or approval of, another document that sets forth such Series or Classes, including any registration statement of the Trust, or as otherwise provided in such resolution. The Trustees may designate the relative rights and preferences of the Shares of each Series. The Trustees may divide the Shares of any Series into Classes. Any Shares of any further Series and Classes that may from time to time be

15

established and designated by the Trustees shall be established and designated, and the variations in the relative rights and preferences as between the different Series shall be fixed and determined, by the Trustees; provided, that all Shares shall be identical except for such variations as shall be fixed and determined between different Series or Classes by the Trustees in establishing and designating such Class or Series. Unless otherwise designated by the Trustees in the By-Laws or resolutions establishing a Series or Class, the purchase price, the method of determining the net asset value, and the relative liquidation, voting, dividend and other rights and preferences of holders of each Series or Class shall be as set forth in the Trust's Registration Statement on Form N-2 under the Securities Act of 1933 and/or the 1940 Act relating to the issuance of Shares of such Series or Class.

All references to Shares in this Declaration shall be deemed to be Shares of any or all Series or Classes as the context may require. The Trust shall maintain separate and distinct records for each Series and hold and account for the assets thereof separately from the other assets of the Trust or of any other Series. A Series may issue any number of Shares or any Class thereof and need not issue Shares. Except as otherwise provided with respect to a specific Class, each Share of a Series shall represent an equal beneficial interest in the net assets of such Series. Each holder of Shares of a Series or a Class thereof shall be entitled to receive his pro rata share of all distributions made with respect to such Series or Class. Upon redemption of his Shares, such Shareholder shall be paid solely out of the funds and property of such Series. The Trustees may adopt and change the name of any Series or Class without Shareholder approval.

Section 2. Shares. The beneficial interest in the Trust shall be divided into transferable Shares of one or more separate and distinct Series or Classes established by the Trustees. The number of Shares of each Series and Class is unlimited and each Share shall have no par value per Share or such other amount as the Trustees may establish. All Shares issued hereunder shall be fully paid and nonassessable. Shareholders shall have no preemptive or other right to subscribe to any additional Shares or other securities issued by the Trust. The Trustees shall have full power and authority, in their sole discretion and without obtaining Shareholder approval, to issue original or additional Shares at such times and on such terms and conditions as they deem appropriate; to issue fractional Shares and Shares held in the treasury; to establish and to change in any manner Shares of any Series or Classes with such preferences, rights upon liquidation, redemption rights, terms of conversion, voting powers, and other rights and privileges as the Trustees may determine (but the Trustees may not change Outstanding Shares in a manner materially adverse to the Shareholders of such Shares); to divide or combine the Shares of any Series or Classes into a greater or lesser number; to classify or reclassify any unissued Shares of any Series or Classes into one or more Series or Classes of Shares; to abolish any one or more Series or Classes of Shares; to issue Shares to acquire other assets (including assets subject to, and in connection with, the assumption of liabilities) and businesses; and to take such other action with respect to the Shares as the Trustees may deem desirable. Shares held in the treasury shall not confer any voting rights on the Trustees and shall not be entitled to any dividends or other distributions declared with respect to the Shares.

Section 3. Investment in the Trust. The Trustees shall accept investments in any Series or Class from such persons and on such terms as they may from time to time authorize. At the Trustees' discretion, such investments, subject to applicable law, may be in the form of cash or securities in which that Series is authorized to invest, valued as provided in Article VI, Section 3.

16

Investments in a Series shall be credited to each Shareholder's account in the form of full Shares at the Net Asset Value per Share next determined after the investment is received or accepted as may be determined by the Trustees; provided, however, that the Trustees may, in their sole discretion, (a) impose a sales charge upon investments in any Series or Class, (b) issue fractional Shares, (c) determine the Net Asset Value per Share of the initial capital contribution or (d) authorize the issuance of Shares at a price other than Net Asset Value to the extent permitted by the 1940 Act or any rule, order or interpretation of the Commission thereunder. The Trustees shall have the right to refuse to accept investments in any Series at any time without any cause or reason therefor whatsoever.

Section 4. Assets and Liabilities of Series. All consideration received by the Trust for the issue or sale of Shares of a particular Series, together with all assets in which such consideration is invested or reinvested, all income, earnings, profits, and proceeds thereof (including any proceeds derived from the sale, exchange or liquidation of such assets, and any funds or payments derived from any reinvestment of such proceeds in whatever form the same may be), shall be held and accounted for separately from the assets of every other Series and are referred to as "assets belonging to" that Series. The assets belonging to a Series shall belong only to that Series for all purposes, and to no other Series, subject only to the rights of creditors of that Series. Any assets, income, earnings, profits, and proceeds thereof, funds, or payments which are not readily identifiable as belonging to any particular Series shall be allocated by the Trustees between and among one or more Series as the Trustees deem fair and equitable. Each such allocation shall be conclusive and binding upon the Shareholders of all Series for all purposes, and such assets, earnings, income, profits or funds, or payments and proceeds thereof shall be referred to as assets belonging to that Series. Separate and distinct records shall be maintained for each Series and the assets held with respect to each Series shall be held and accounted for separately from the assets held with respect to all other Series and from any assets, income, earnings, profits, and proceeds thereof, funds, or payments which are not readily identifiable as belonging to any particular Series that are not allocated to such Series by the Trustees in accordance with this Section 4. The assets belonging to a Series shall be so recorded upon the books of the Trust, and shall be held by the Trustees in trust for the benefit of the Shareholders of that Series. The assets belonging to a Series shall be charged with the liabilities of that Series and all expenses, costs, charges and reserves attributable to that Series, except that liabilities and expenses allocated solely to a particular Class shall be borne by that Class. Any general liabilities, expenses, costs, charges or reserves of the Trust which are not readily identifiable as belonging to any particular Series or Class shall be allocated and charged by the Trustees between or among any one or more of the Series or Classes in such manner as the Trustees deem fair and equitable. Each such allocation shall be conclusive and binding upon the Shareholders of all Series or Classes for all purposes.

Without limiting the foregoing, but subject to the right of the Trustees to allocate general liabilities, expenses, costs, charges or reserves as herein provided, (a) the debts, liabilities, obligations and expenses incurred, contracted for or otherwise existing with respect to a particular Series shall be enforceable against the assets of such Series only, and not against the assets of any other Series or against the assets of the Trust generally, and (b) none of the debts, liabilities, obligations and expenses incurred, contracted for or otherwise existing with respect to the Trust generally or any other Series thereof shall be enforceable against the assets of such Series. Notice of this contractual limitation on liabilities among Series shall be set forth in the

17

certificate of trust of the Trust (whether originally or by amendment) as filed or to be filed in the Office of the Secretary of State of the State of Delaware pursuant to the Delaware Act, and upon the giving of such notice in the certificate of trust, the statutory provisions of Section 3804 of the Delaware Act relating to limitations on liabilities among Series (and the statutory effect under Section 3804 of setting forth such notice in the certificate of trust) shall become applicable to the Trust and each Series. Any person extending credit to, contracting with or having any claim against any Series may look only to the assets of that Series to satisfy or enforce any debt, with respect to that Series. No Shareholder or former Shareholder of any Series shall have a claim on or any right to any assets allocated or belonging to any other Series.

Section 5. Ownership and Transfer of Shares. The Trust or a transfer or similar agent for the Trust shall maintain a register containing the names and addresses of the Shareholders of each Series and Class thereof, the number of Shares of each Series and Class held by such Shareholders, and a record of all Share transfers. The register shall be conclusive as to the identity of Shareholders of record and the number of Shares held by them from time to time. The Trustees may authorize the issuance of certificates representing Shares and adopt rules governing their use. The Trustees may make rules governing the transfer of Shares, whether or not represented by certificates. Except as otherwise provided by the Trustees, Shares shall be transferable on the books of the Trust only by the record holder thereof or by his duly authorized agent upon delivery to the Trustees or the Trust's transfer agent of a duly executed instrument of transfer, together with a Share certificate if one is outstanding, and such evidence or the genuineness of each such execution and authorization and of such other matters as may be required by the Trustees. Upon such delivery, and subject to any further requirements specified by the Trustees or contained in the By-Laws, the transfer shall be recorded on the books of the Trust. Until a transfer is so recorded, the Shareholder of record of Shares shall be deemed to be the holder of such Shares for all purposes hereunder and neither the Trustees nor the Trust, nor any transfer agent or registrar or any officer, employee or agent of the Trust, shall be affected by any notice of a proposed transfer.

Section 6. Status of Shares; Limitation of Shareholder Liability. Shares shall be deemed to be personal property giving Shareholders only the rights provided in this Declaration. Every Shareholder, by virtue of having acquired a Share, shall be held expressly to have assented to and agreed to be bound by the terms of this Declaration and to have become a party hereto. No Shareholder shall be personally liable for the debts, liabilities, obligations and expenses incurred by, contracted for, or otherwise existing with respect to, the Trust or any Series. The death, incapacity, dissolution, termination or bankruptcy of a Shareholder during the existence of the Trust shall not operate to terminate the Trust, nor entitle the representative of any such Shareholder to an accounting or to take any action in court or elsewhere against the Trust or the Trustees, but entitles such representative only to the rights of such Shareholder under this Trust. Ownership of Shares shall not entitle the Shareholder to any title in or to the whole or any part of the Trust Property or right to call for a partition or division of the same or for an accounting, nor shall the ownership of Shares constitute the Shareholders as partners. Neither the Trust nor the Trustees shall have any power to bind any Shareholder personally or to demand payment from any Shareholder for anything, other than as agreed by the Shareholder. Shareholders shall have the same limitation of personal liability as is extended to shareholders of a private corporation for profit incorporated in the State of Delaware. Every written obligation of the Trust or any Series shall contain a statement to the effect that such obligation may only be enforced against

18

the assets of the appropriate Series or all Series; however, the omission of such statement shall not operate to bind or create personal liability for any Shareholder or Trustee.

Section 7. Other Securities. The Trustees may authorize and issue such other securities of the Trust other than Shares as they determine to be necessary, desirable or appropriate, having such terms, rights, preferences, privileges, limitations and restrictions as the Trustees see fit, including preferred interests, debt securities or other senior securities. To the extent that the Trustees authorized and issue preferred shares of any Class or Series, they are hereby authorized and empowered to amend or supplement this Declaration as they deem necessary or appropriate, including to comply with the requirements of the 1940 Act or requirements imposed by the rating agencies or other Persons, all without the approval of Shareholders. Any such supplement or amendment shall be filed as is necessary. The Trustees are also authorized to take such actions and retain such persons as they see fit to offer and sell such securities.

ARTICLE VI

DISTRIBUTIONS AND REDEMPTIONS

Section 1. Distributions. The Trustees or a committee of one or more Trustees may declare and pay dividends and other distributions, including dividends on Shares of a particular Series and other distributions from the assets belonging to that Series. No dividend or distribution, including, without limitation, any distribution paid upon termination of the Trust or of any Series (or Class) with respect to, nor any redemption or repurchase of, the Shares of any Series (or Class) shall be effected by the Trust other than from the assets held with respect to such Series, nor shall any Shareholder of any particular Series otherwise have any right or claim against the assets held with respect to any other Series except to the extent that such Shareholder has such a right or claim hereunder as a Shareholder of such other Series. The Trustees shall have full discretion to determine which items shall be treated as income and which items as capital; and each such determination and allocation shall be conclusive and binding upon the Shareholders. The amount and payment of dividends or distributions and their form, whether they are in cash, Shares or other Trust Property, shall be determined by the Trustees. Dividends and other distributions may be paid pursuant to a standing resolution adopted once or more often as the Trustees determine. Except as provided with respect to a particular Class in the By-Laws or the resolutions establishing such Class, all dividends and other distributions on Shares of a particular Series shall be distributed pro rata to the Shareholders of that Series in proportion to the number of Shares of that Series they held on the record date established for such payment. The Trustees may adopt and offer to Shareholders such dividend reinvestment plans, cash dividend payout plans or similar plans as the Trustees deem appropriate.

Section 2. Redemptions. Except as provided with respect to a particular Class in the By-Laws or the resolutions establishing such Class, Shares of the Trust will not be redeemed or repurchased by the Trust, except as the Trustees shall determine from time to time and the Trust shall be under no obligation to redeem or repurchase Shares. The Trustees may specify conditions, prices, and places of redemption, may specify binding requirements for the proper form or forms of requests for redemption and may specify the amount of any redemption fee to be withheld from redemption proceeds. Payment of the redemption price may be wholly or partly in securities or other assets at the value of such securities or assets used in such

19

determination of Net Asset Value, or may be in cash. Upon redemption, Shares may be reissued from time to time. The Trustees may require Shareholders to redeem Shares for any reason under terms set by the Trustees, including, but not limited to, the failure of a Shareholder to supply a taxpayer identification number if required to do so, or to have the minimum investment required, or to pay when due for the purchase of Shares issued to him. To the extent permitted by law, the Trustees may retain the proceeds of any redemption of Shares required by them for payment of amounts due and owing by a Shareholder to the Trust or any Series or Class or any governmental authority. Notwithstanding the foregoing, the Trustees may postpone payment of the redemption price and may suspend the right of the Shareholders to require any Series or Class to redeem Shares during any period of time when and to the extent permissible under the 1940 Act.

Section 3. Determination of Net Asset Value. The Trustees shall cause the Net Asset Value of Shares of each Series or Class to be determined from time to time in a manner consistent with applicable laws and regulations. The Trustees may delegate the power and duty to determine Net Asset Value per Share to one or more Trustees or officers of the Trust or to a custodian, depository or other agent appointed for such purpose. The Net Asset Value of Shares shall be determined separately for each Series or Class at such times as may be prescribed by the Trustees or, in the absence of action by the Trustees, as of the close of trading on the New York Stock Exchange on the last day of each week.

Section 4. Suspension of Right of Redemption. If, as referred to in
Section 2 of this Article, the Trustees postpone payment of the redemption price and suspend the right of Shareholders to redeem their Shares, such suspension shall take effect at the time the Trustees shall specify, but not later than the close of business on the business day next following the declaration of suspension. Thereafter Shareholders shall have no right of redemption or payment until the Trustees declare the end of the suspension. If the right of redemption is suspended, a Shareholder may withdraw his request for redemption.

ARTICLE VII

SHAREHOLDERS' VOTING POWERS AND MEETINGS

Section 1. Voting Powers. Subject to the voting rights established with respect to a particular Class in the By-Laws or the resolutions establishing such Class, the Shareholders shall have power to vote only with respect to (a) the election of Trustees as provided in Section 2 of this Article; (b) the removal of Trustees as provided in Article II, Section 5(a); (c) any investment advisory or management contract to the extent required by the 1940 Act; (d) the amendment of this Declaration to the extent and as provided in Article X,
Section 10; (e) the conversion of the Trust to an open-end investment company to the extent provided in Article IX, Section 5; (f) the reorganization of the Trust to the extent provided in Article IX, Section 6; (g) to approve a transaction subject to Article IX, Section 7, and (h) such additional matters relating to the Trust as may be required by the 1940 Act or any registration of the Trust with the Commission or any State, or as the Trustees may consider desirable.

On any matter submitted to a vote of the Shareholders, all Shares shall be voted by individual Series or Class, except (a) as provided with respect to a particular Class in the By-

20

Laws or the resolutions establishing such Class, (b) when required by the 1940 Act, Shares shall be voted in the aggregate and not by individual Series or Class, and (c) when the Trustees have determined that the matter affects the interests of more than one Series or Class, then the Shareholders of all such Series or Classes shall be entitled to vote thereon. As determined by the Trustees without the vote or consent of shareholders and except as provided with respect to a particular Class in the By-Laws or the resolutions establishing such Class, on any matter submitted to a vote of Shareholders either (i) each whole Share shall be entitled to one vote as to any matter on which it is entitled to vote and each fractional Share shall be entitled to a proportionate fractional vote or (ii) each dollar of net asset value (number of Shares owned times net asset value per share of such Series or Class, as applicable) shall be entitled to one vote on any matter on which such Shares are entitled to vote and each fractional dollar amount shall be entitled to a proportionate fractional vote. Without limiting the power of the Trustees in any way to designate otherwise in accordance with the preceding sentence, the Trustees hereby establish that each whole Share shall be entitled to one vote as to any matter on which it is entitled to vote and each fractional Share shall be entitled to a proportionate fractional vote. There shall be no cumulative voting in the election of Trustees. Shares may be voted in person or by proxy or in any manner provided for in the By-Laws. The By-Laws may provide that proxies may be given by any electronic or telecommunications device or in any other manner, but if a proposal by anyone other than the officers or Trustees is submitted to a vote of the Shareholders of any Series or Class, or if there is a proxy contest or proxy solicitation or proposal in opposition to any proposal by the officers or Trustees, Shares may be voted only in person or by written proxy. Until Shares of a Series are issued, as to that Series the Trustees may exercise all rights of Shareholders and may take any action required or permitted to be taken by Shareholders by law, this Declaration or the By-Laws. Meetings of Shareholders shall be called and notice thereof and record dates therefor shall be given and set as provided in the By-Laws.

Section 2. Quorum; Required Vote. One-third of the Outstanding Shares of each Series or Class, or one-third of the Outstanding Shares of the Trust, entitled to vote in person or by proxy shall be a quorum for the transaction of business at a Shareholders' meeting with respect to such Series or Class, or with respect to the entire Trust, respectively. Any lesser number shall be sufficient for adjournments. Any adjourned session of a Shareholders' meeting may be held within a reasonable time without further notice. Except when a larger vote is required by the 1940 Act, this Declaration or the By-Laws, a majority of the Shares voting at a Shareholders' meeting in person or by proxy shall decide any matters to be voted upon with respect to the entire Trust and a plurality of such Shares shall elect a Trustee; provided, that if this Declaration or applicable law permits or requires that Shares be voted on any matter by individual Series or Classes, then a majority of the Shares of that Series or Class (or, if required by law, a majority of the Shares outstanding and entitled to vote of that Series or Class) voting at a Shareholders' meeting in person or by proxy on the matter shall decide that matter insofar as that Series or Class is concerned.

Section 3. Record Dates. For the purpose of determining the Shareholders of any Series (or Class) who are entitled to receive payment of any dividend or of any other distribution, the Trustees may from time to time fix a date, which shall be before the date for the payment of such dividend or such other payment, as the record date for determining the Shareholders of such Series (or Class) having the right to receive such dividend or distribution. Without fixing a record date, the Trustees may for distribution purposes close the register or transfer books for

21

one or more Series (or Classes) any time prior to the payment of a distribution. Nothing in this Section shall be construed as precluding the Trustees from setting different record dates for different Series (or Classes).

Section 4. Additional Provisions. The By-Laws may include further provisions for Shareholders' votes and meetings and related matters.

ARTICLE VIII

EXPENSES OF THE TRUST AND SERIES

Section 1. Payment of Expenses by the Trust. Subject to Article V,
Section 4, the Trust or a particular Series shall pay, or shall reimburse the Trustees from the assets belonging to all Series or the particular Series, for their expenses (or the expenses of a Class of such Series) and disbursements, including, but not limited to, interest charges, taxes, brokerage fees and commissions; expenses of issue, repurchase and redemption of Shares; insurance premiums; applicable fees, interest charges and expenses of third parties, including the Trust's investment advisers, managers, administrators, distributors, custodians, transfer agents and fund accountants; fees of pricing, interest, dividend, credit and other reporting services; costs of membership in trade associations; telecommunications expenses; funds transmission expenses; auditing, legal and compliance expenses; costs of forming the Trust and its Series and maintaining its existence; costs of preparing and printing the prospectuses of the Trust and each Series, statements of additional information and Shareholder reports and delivering them to Shareholders; expenses of meetings of Shareholders and proxy solicitations therefor; costs of maintaining books and accounts; costs of reproduction, stationery and supplies; fees and expenses of the Trustees; compensation of the Trust's officers and employees and costs of other personnel performing services for the Trust or any Series; costs of Trustee meetings; Commission registration fees and related expenses; state or foreign securities laws registration fees and related expenses; and for such non-recurring items as may arise, including litigation to which the Trust or a Series (or a Trustee or officer of the Trust acting as such) is a party, and for all losses and liabilities by them incurred in administering the Trust. The Trustees shall have a lien on the assets belonging to the appropriate Series, or in the case of an expense allocable to more than one Series, on the assets of each such Series, prior to any rights or interests of the Shareholders thereto, for the reimbursement to them of such expenses, disbursements, losses and liabilities.

Section 2. Payment of Expenses by Shareholders. The Trustees shall have the power, as frequently as they may determine, to cause each Shareholder, or each Shareholder of any particular Series, to pay directly, in advance or arrears, for charges of the Trust's custodian or transfer, shareholder servicing or similar agent, an amount fixed from time to time by the Trustees, by setting off such charges due from such Shareholder from declared but unpaid dividends owed such Shareholder and/or by reducing the number of Shares in the account of such Shareholder by that number of full and/or fractional Shares which represents the outstanding amount of such charges due from such Shareholder.

22

ARTICLE IX

MISCELLANEOUS

Section 1. Trust Not a Partnership. This Declaration creates a trust and not a partnership. No Trustee shall have any power to bind personally either the Trust's officers or any Shareholder.

Section 2. Trustee Action. The exercise by the Trustees of their powers and discretion hereunder in good faith and with reasonable care under the circumstances then prevailing shall be binding upon everyone interested. Subject to the provisions of Article IV, the Trustees shall not be liable for errors of judgment or mistakes of fact or law.

Section 3. Record Dates. The Trustees may fix in advance a date up to ninety (90) days before the date of any Shareholders' meeting, or the date for the payment of any dividends or other distributions, or the date for the allotment of rights, or the date when any change or conversion or exchange of Shares shall go into effect as a record date for the determination of the Shareholders entitled to notice of, and to vote at, any such meeting, or entitled to receive payment of such dividend or other distribution, or to receive any such allotment of rights, or to exercise such rights in respect of any such change, conversion or exchange of Shares.

Section 4. Termination of the Trust.

(a) This Trust shall have perpetual existence subject to the provisions of this Section 4.

(b) The Trust or any Series or Class thereof may be dissolved and terminated by the affirmative vote of not less than three-quarters of the Trustees then in office by written notice to the Shareholders.

(c) In connection with subsection (b) or to the extent appropriate in connection with a reorganization as provided in Article IX,
Section 6, upon making reasonable provision for the payment of all known liabilities of all Series or any affected Series or Classes, by such assumption or otherwise, the Trustees shall distribute the remaining proceeds or assets (as the case may be) ratably among the Shareholders of all Series or any affected Series or Classes; however, the payment to any particular Class of such Series may be reduced by any fees, expenses or charges allocated to that Class.

(d) Upon completion of the distribution of the remaining proceeds or assets pursuant to subsection (c) above, the Trust or affected Series or Classes shall terminate and the Trustees and the Trust shall be discharged of any and all further liabilities and duties hereunder with respect thereto and the right, title and interest of all parties therein shall be canceled and discharged. Upon termination of the Trust, following completion of winding up of its business, the Trustees shall cause a certificate of cancellation of the Trust's certificate of trust to be filed in accordance with the Delaware Act, which certificate of cancellation may be signed by any one Trustee.

23

Section 5. Conversion to an Open-End Investment Company.
Notwithstanding any other provisions of this Declaration or the By-Laws of the Trust, a favorable vote of a majority of the Trustees then in office followed by the favorable vote of the holders of not less than three-quarters of the Shares of each affected class or series outstanding, voting as separate classes or series, shall be required to approve, adopt or authorize an amendment to this Declaration that makes the Shares a "redeemable security" as that term is defined in the 1940 Act, unless such amendment has been approved by three-quarters of the Trustees, in which case approval by a vote of a majority of the Shares outstanding and entitled to vote shall be required. Upon the adoption of a proposal to convert the Trust from a "closed-end company" to an "open-end company" as those terms are defined by the 1940 Act and the necessary amendments to this Declaration to permit such a conversion of the Trust's outstanding Shares entitled to vote, the Trust shall, upon complying with any requirements of the 1940 Act and state law, become an "open-end" investment company. Such affirmative vote or consent shall be in addition to the vote or consent of the holders of the Shares otherwise required by law, or any agreement between the Trust and any national securities exchange.

Section 6. Reorganization.

(a) Except as provided in clause (b) of this Section 6 or in
Section 7 of this Article IX, subject to the affirmative vote of not less than three-quarters of the Outstanding Shares and entitled to vote of the Trust or any affected Series, the Trust may merge or consolidate with any other corporation, association, trust or other organization or may sell, lease or exchange all or substantially all of the Trust Property or the property, including its good will, upon such terms and conditions and for such consideration when and as authorized by a majority of the Trustees; provided however, if at least three-quarters of the Trustees then in office have approved such transaction, then the actions may be approved by the affirmative vote of a majority of the Outstanding Shares entitled to vote of the Trust or the affected Series.

(b) Notwithstanding anything else herein, to change the Trust's form or place of organization the Trustees may, without Shareholder approval unless such approval is required by applicable law, (i) cause the Trust to merge or consolidate with or into one or more entities, if the surviving or resulting entity is the Trust or any other corporation, association, trust or other organization, or a series thereof, (ii) cause the Shares to be exchanged under or pursuant to any state or federal statute to the extent permitted by law, or (iii) cause the Trust to incorporate under the laws of Delaware or any other U.S. jurisdiction. Any agreement of merger or consolidation or certificate of merger may be signed by a majority of Trustees and facsimile signatures conveyed by electronic or telecommunication means shall be valid.

(c) Pursuant to and in accordance with the provisions of
Section 3815(f) of the Delaware Act, an agreement of merger or consolidation approved by the Trustees, and if applicable, Shareholders in accordance with this Section 6 may effect any amendment to the Declaration or effect the adoption of a new trust instrument of the Trust if it is the surviving or resulting trust in the merger or consolidation.

(d) The Trustees may create one or more statutory trusts to which all or any part of the assets, liabilities, profits or losses of the Trust or any Series or Class thereof may be transferred and may provide for the conversion of Shares in the Trust or any Series or Class

24

thereof into beneficial interests in any such newly created trust or trusts or any series or classes thereof.

Section 7. Certain Transactions.

(a) Notwithstanding any other provision of this Declaration and subject to the exceptions provided in paragraph (d) of this Section, the types of transactions described in paragraph (c) of this Section shall require the affirmative vote or consent of a majority of the Trustees then in office followed by the affirmative vote or consent of holders of not less than three-quarters of the Shares of each affected class or series outstanding, votes voting as separate classes or series, when a Principal Shareholder (as defined in paragraph (b) of this Section) is a party to the transaction. Such affirmative vote or consent shall be in addition to the vote or consent of the holders of Shares otherwise required by law or by the terms of any class or series of preferred stock, whether now or hereafter authorized, or any agreement between the Trust and any national securities exchange.

(b) The term "Principal Shareholder" shall mean any corporation, Person or other entity which is the beneficial owner, directly or indirectly, of five percent (5%) or more of the outstanding Shares of any class or series and shall include any affiliate or associates, as such terms are defined in clause (ii) below, of a Principal Shareholder. For the purpose of this Section, in addition to the Shares which a corporation, Person or other entity beneficially owns directly, (a) any corporation, Person or other entity shall be deemed to be the beneficial owner of any Shares (i) which it has the right to acquire pursuant to any agreement or upon exercise of conversion rights or warrants, or otherwise (but excluding share options granted by the Trust) or
(ii) which are beneficially owned, directly or indirectly (including Shares deemed owned through application of clause (i) above, by any other corporation, Person or entity with which its "affiliate" or "associate" (as defined below) has any agreement, arrangement or understanding for the purpose of acquiring, holding, voting or disposing of Shares, of which is its "affiliate" or "associate" as those terms are defined in Rule 12b-2 of the General Rules and Regulations under the Securities Exchange Act of 1934, and (b) the outstanding Shares shall include Shares deemed owned through application of clauses (i) and
(ii) above but shall not include any other Shares which may be issuable pursuant to any agreement, or upon exercise of conversion rights or warrants, or otherwise.

(c) This Section shall apply to the following transactions:

(i) The merger or consolidation of the Trust or any subsidiary of the Trust with or into any Principal Shareholder.

(ii) The issuance of any securities of the Trust to any Principal Shareholder for such (other than pursuant to any automatic dividend reinvestment plan).

(iii) The sale, lease or exchange to the Trust or any subsidiary thereof, in exchange for securities of the Trust, of any assets of any Principal Shareholder (except assets having an aggregate fair market value of less than $1,000,000,

25

aggregating for the purpose of such computation all assets sold, leased or exchanged in any series of similar transactions within a twelve-month period.)

(iv) The sale, lease or exchange to the Trust or any subsidiary thereof, in exchange for securities of the Trust, of any assets of any Principal Shareholder (except assets having an aggregate fair market value of less than $1,000,000, aggregating for the purposes of such computation all assets sold, leased or exchanged in any series of similar transactions within a twelve-month period).

(d) The provisions of this Section shall not be applicable to
(i) any of the transactions described in paragraph (c) of this Section if three-quarters of the Trustees shall by resolution have approved a memorandum of understanding with such Principal Shareholder with respect to and substantially consistent with such transaction, in which case approval by the vote of a majority of the Shares outstanding and entitled to vote shall be the only vote of Shareholders required by this Section, or (ii) any such transaction with any entity of which a majority of the outstanding shares of all classes and series of a stock normally entitled to vote in elections of directors is owner of record or beneficially by the Trust and its subsidiaries.

(e) The Board of Trustees shall have the power and duty to determine for the purposes of this Section on the basis of information known to the Trust whether (i) a corporation, person or entity beneficially owns five percent (5%) or more of the outstanding Shares of any class or series, (ii) a corporation, person or entity is an "affiliate" or "associate" (as defined above) of another, (iii) the assets being acquired or leased to or by the Trust or any subsidiary thereof constitute a substantial part of the assets of the Trust and have an aggregate fair market value of less than $1,000,000, and (iv) the memorandum of understanding referred to in paragraph (d) hereof is substantially consistent with the transaction covered thereby. Any such determination shall be conclusive and binding for all purposes of this Section.

Section 8. Declaration of Trust. The original or a copy of this Declaration of Trust and of each amendment hereto or Declaration of Trust supplemental shall be kept at the office of the Trust where it may be inspected by any Shareholder. Anyone dealing with the Trust may rely on a certificate by a Trustee or an officer of the Trust as to the authenticity of the Declaration of Trust or any such amendments or supplements and as to any matters in connection with the Trust. The masculine gender herein shall include the feminine and neuter genders. Headings herein are for convenience only and shall not affect the construction of this Declaration of Trust. This Declaration of Trust may be executed in any number of counterparts, each of which shall be deemed an original.

Section 9. Applicable Law. This Declaration and the Trust created hereunder are governed by and construed and administered according to the Delaware Act and the applicable laws of the State of Delaware; provided, however, that there shall not be applicable to the Trust, the Trustees or this Declaration of Trust (a) the provisions of Section 3540 of Title 12 of the Delaware Code, or (b) any provisions of the laws (statutory or common) of the State of Delaware (other than the Delaware Act) pertaining to trusts which relate to or regulate (i) the filing with any court or governmental body or agency of trustee accounts or schedules of trustee fees and charges, (ii) affirmative requirements to post bonds for trustees, officers, agents or employees of a trust, (iii) the necessity for obtaining court or other governmental approval concerning the

26

acquisition, holding or disposition of real or personal property, (iv) fees or other sums payable to trustees, officers, agents or employees of a trust, (v) the allocation of receipts and expenditures to income or principal, (vi) restrictions or limitations on the permissible nature, amount or concentration of trust investments or requirements relating to the titling, storage or other manner of holding of trust assets, or (vii) the establishment of fiduciary or other standards of responsibilities or limitations on the acts or powers of trustees, which are inconsistent with the limitations or liabilities or authorities and powers of the Trustees set forth or referenced in this Declaration. The Trust shall be of the type commonly called a Delaware statutory trust, and, without limiting the provisions hereof, the Trust may exercise all powers which are ordinarily exercised by such a trust under Delaware law. The Trust specifically reserves the right to exercise any of the powers or privileges afforded to trusts or actions that may be engaged in by trusts under the Delaware Act, and the absence of a specific reference herein to any such power, privilege or action shall not imply that the Trust may not exercise such power or privilege or take such actions.

Section 10. Amendments.

(a) The Trustees may, without any Shareholder vote, amend or otherwise supplement this Declaration by making an amendment, a Declaration of Trust supplemental hereto or an amended and restated trust instrument; provided, that Shareholders shall have the right to vote on any amendment (a) which would affect the voting rights of Shareholders granted in Article VII, Section l, (b) to this Section 10, (c) required to be approved by Shareholders by the 1940 Act or by the Trust's registration statement(s) filed with the Commission or any State, and (d) submitted to them by the Trustees in their discretion. Any amendment submitted to Shareholders which the Trustees determine would affect the Shareholders of any Series shall be authorized by vote of the Shareholders of such Series and no vote shall be required of Shareholders of a Series not affected. Notwithstanding anything else herein, any amendment to Article IV which would have the effect of reducing the indemnification and other rights provided thereby to Trustees, officers, employees, and agents of the Trust or to Shareholders or former Shareholders, and any repeal or amendment of this sentence shall each require the affirmative vote of the holders of two-thirds of the Outstanding Shares of the Trust entitled to vote thereon and no such amendment shall effect the right to indemnification of any person who is no longer a Trustee, Officer or employee or agent at the time of such amendment or of any person with respect to any act or omission taken or omitted prior to the adoption or enactment of such amendment or repeal.

(b) The Trustees may not amend this Declaration of Trust to eliminate the rights of Shareholders of any Class or Series as set forth in this
Section 10(b) to vote on any amendment of this Declaration of Trust or the By-Laws or alter or amend the percentage of voting Shares required to approve any amendment or action which requires a specific Shareholder vote under this Declaration of Trust or the By-Laws unless an equivalent vote has authorized such an amendment of the Declaration of Trust or By-Laws. Any amendment which adversely affects the holders of one or more Classes or Series of Shares shall require a vote of the Shareholders holding a majority of the Shares of each Class or Series so adversely affected and entitled to vote thereon and no vote of Shareholders of any Class or Series not so adversely affected shall be required, except that any amendment of any provision of Article IX, Sections 5, 6 or 7 shall require the vote of the Shareholders holding three-quarters of the Shares of each

27

Class and Series entitled to vote thereon, regardless of the percentage of Trustees recommending such amendment.

Section 11. Derivative Actions. In addition to the requirements set forth in Section 3816 of the Delaware Act, a Shareholder may bring a derivative action on behalf of the Trust only if the following conditions are met:

(a) The Shareholder or Shareholders must make a pre-suit demand upon the Trustees to bring the subject action unless an effort to cause the Trustees to bring such an action is not likely to succeed. For purposes of this Section 11(a), a demand on the Trustees shall only be deemed not likely to succeed and therefore excused if a majority of the Board of Trustees, or a majority of any committee established to consider the merits of such action, is composed of Trustees who are not "independent trustees" (as that term is defined in the Delaware Act).

(b) Unless a demand is not required under paragraph (a) of this Section 11, Shareholders eligible to bring such derivative action under the Delaware Act who hold at least 10% of the Outstanding Shares of the Trust, or 10% of the Outstanding Shares of the Series or Class to which such action relates, shall join in the request for the Trustees to commence such action; and

(c) Unless a demand is not required under paragraph (a) of this Section 11, the Trustees must be afforded a reasonable amount of time to consider such shareholder request and to investigate the basis of such claim. The Trustees shall be entitled to retain counsel or other advisers in considering the merits of the request and shall require an undertaking by the Shareholders making such request to reimburse the Trust for the expense of any such advisers in the event that the Trustees determine not to bring such action.

For purposes of this Section 11, the Board of Trustees may designate a committee of one Trustee to consider a Shareholder demand if necessary to create a committee with a majority of Trustees who are independent trustees.

Section 12. Fiscal Year. The fiscal year of the Trust shall end on a specified date as set forth in the By-Laws. The Trustees may change the fiscal year of the Trust without Shareholder approval.

Section 13. Severability. The provisions of this Declaration are severable. If the Trustees determine, with the advice of counsel, that any provision hereof conflicts with the 1940 Act, the regulated investment company provisions of the Internal Revenue Code or with other applicable laws and regulations, the conflicting provision shall be deemed never to have constituted a part of this Declaration; provided, however, that such determination shall not affect any of the remaining provisions of this Declaration or render invalid or improper any action taken or omitted prior to such determination. If any provision hereof shall be held invalid or unenforceable in any jurisdiction, such invalidity or unenforceability shall attach only to such provision only in such jurisdiction and shall not affect any other provision of this Declaration.

{REMAINDER OF PAGE INTENTIONALLY LEFT BLANK.}

28

IN WITNESS WHEREOF, the undersigned being all the Trustees of the Trust have executed this instrument as Trustee and not individually and as of the date first written above.

/s/ John P. Calamos
---------------------------------------
John P. Calamos

/s/ Nick P. Calamos
---------------------------------------
Nick P. Calamos

/s/ Stephen B. Timbers
---------------------------------------
Stephen B. Timbers

/s/ Joe F. Hanauer
---------------------------------------
Joe F. Hanauer

/s/ Weston W. Marsh
---------------------------------------
Weston W. Marsh

/s/ John E. Neal
---------------------------------------
John E. Neal

/s/ William Rybak
---------------------------------------
William Rybak


EXHIBIT a.2

CERTIFICATE OF TRUST

OF

CALAMOS GLOBAL TOTAL RETURN FUND

The undersigned, constituting all of the members of the Board of Trustees of the Calamos Global Total Return Fund (the "Trust"), in order to form a Delaware statutory trust pursuant to Section 3810 of the Delaware Statutory Trust Act, hereby certifies the following:

1. The name of the Delaware statutory trust is Calamos Global Total Return Fund.

2. Prior to the issuance of beneficial interests, the Trust will become a registered investment company under the Investment Company Act of 1940, as amended.

3. Notice is hereby given that pursuant to Section 3804 of the Delaware Statutory Trust Act, the debts, liabilities, obligations and expenses incurred, contracted for or otherwise existing with respect to a particular series of the Trust shall be enforceable against the assets of such series only and not against the assets of the Trust generally or any other series thereof, and, unless otherwise provided in the governing instrument of the Trust, none of the debts, liabilities, obligations and expenses incurred, contracted for or otherwise existing with respect to the Trust generally or any other series thereof shall be enforceable against the assets of such series.

4. The registered office of the Trust in Delaware is c/o The Corporation Trust Company, 1209 Orange Street, Wilmington, Delaware 19801.

5. The registered agent for service of process on the Trust is The Corporation Trust Company, 1209 Orange Street, Wilmington, Delaware 19801.

6. This Certificate of Trust shall be effective on the date it is filed with the Office of the Delaware Secretary of State.

IN WITNESS WHEREOF, the undersigned Trustee of the Trust has executed this Certificate as of the 12th day of March, 2004.

/s/ John P. Calamos                      /s/ Weston W. Marsh
-------------------------                -----------------------------
John P. Calamos                          Weston W. Marsh
Trustee                                  Trustee

/s/ Nick P. Calamos                      /s/ John E. Neal
-------------------------                -----------------------------
Nick P. Calamos                          John E. Neal
Trustee                                  Trustee

/s/  Stephen B. Timbers                  /s/ William Rybak
-------------------------                -----------------------------
Stephen B. Timbers                       William Rybak
Trustee                                  Trustee

/s/ Joe F. Hanauer
-------------------------
Joe F. Hanauer
Trustee


EXHIBIT b

BY-LAWS
OF
CALAMOS GLOBAL TOTAL RETURN FUND

ARTICLE 1

1.1 Agreement and Declaration of Trust. These By-Laws shall be subject to the Agreement and Declaration of Trust, as from time to time amended, supplemented or restated (the "Declaration of Trust") of Calamos Global Total Return Fund (the "Trust"), a Delaware statutory trust established by the Declaration of Trust.

1.2 Definitions. Unless otherwise defined herein, the terms used herein have the respective meanings given them in the Declaration of Trust.

ARTICLE 2

OFFICES

2.1 Principal Office. The principal office of the Trust shall be located at 1111 East Warrenville Road, Naperville, Illinois 60593-1493, or such other location as the Trustees may from time to time determine.

2.2 Other Offices. The Trust may have offices in such other places without as well as within the State of Delaware as the Trustees may from time to time determine.

2.3 Registered Office and Registered Agent. The registered office of the Trust shall be located in the City of Wilmington, State of Delaware or such other location within the State of Delaware as the Trustees may from time to time determine. The Board of Trustees shall establish a registered office in the State of Delaware and shall appoint a registered agent for service of process in the State of Delaware for the Trust as provided in the Delaware Statutory Trust Act, 12 Del. C. ss. 3807, as amended from time to time.

ARTICLE 3

SHAREHOLDERS

3.1 Annual Meetings. Annual meetings of the Shareholders of the Trust or a Series or Class thereof shall be held on such date and at such place within or without the State of Delaware as the Trustees shall designate.

3.2 Special Meetings.

(a) Special meetings of the Shareholders may be called at any time by the Chairman, the President or the Trustees. Subject to subsection (c) of this Section 3.2, a special meeting of Shareholders shall also be called by the Secretary of the Trust upon the written request of the Shareholders entitled to cast not less than a majority of all the votes entitled to be cast at such meeting.


(b) Any Shareholder of record seeking to have Shareholders request a special meeting shall, by sending written notice to the Secretary (the "Record Date Request Notice") by registered mail, return receipt requested, request the Trustees to fix a record date to determine the Shareholders entitled to request a special meeting (the "Requested Record Date"). The Record Date Request Notice shall set forth the purpose of the meeting and the matters proposed to be acted on at it, shall be signed by one or more Shareholders of record as of the date of signature (or their duly authorized agents), shall bear the date of signature of each such Shareholder (or other agent) and shall set forth all information relating to each such Shareholder that must be disclosed in solicitations of proxies for election of trustees in an election contest (even if an election contest is not involved), or is otherwise required, in each case pursuant to Regulation 14A under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), and Rule 14a-11 thereunder. Upon receiving the Record Date Request Notice, the Trustees may fix a Requested Record Date. The Requested Record Date shall not precede and shall not be more than ten (10) days after the close of business on the date on which the resolution fixing the Requested Record Date is adopted by the Trustees. If the Trustees, within thirty (30) days after the date on which a valid Record Date Request Notice is received, fail to adopt a resolution fixing the Requested Record Date and make a public announcement of such Requested Record Date, the Requested Record Date shall be the close of business on the 30th day after the first date on which the Record Date Request Notice is received by the Secretary.

(c) In order for any Shareholder to request a special meeting, one or more written requests for a special meeting signed by Shareholders of record (or their duly authorized agents) as of the Requested Record Date entitled to cast not less than a majority (the "Special Meeting Percentage") of all of the votes entitled to be cast at such meeting (the "Special Meeting Request") shall be delivered to the Secretary. In addition, the Special Meeting Request shall set forth the purpose of the meeting and the matters proposed to be acted on at it (which shall be limited to the matters set forth in the Record Date Request Notice received by the Secretary), shall bear the date of signature of each such Shareholder (or other agent) signing the Special Meeting Request, shall set forth the name and address, as they appear in the Trust's books, of each Shareholder signing such request (or on whose behalf the Special Meeting Request is signed) and the class and number of shares of the Trust which are owned of record and beneficially by each such Shareholder, shall be sent to the Secretary by registered mail, return receipt requested, and shall be received by the Secretary within sixty (60) days after the Request Record Date. Any requesting Shareholder may revoke his, her or its request for a special meeting at any time by written revocation delivered to the Secretary.

(d) The Secretary shall inform the requesting Shareholders of the reasonably estimated cost of preparing and mailing the notice of meeting (including the Trust's proxy materials). The Secretary shall not be required to call a special meeting upon Shareholder request and such meeting shall not be held unless, in addition to the documents required by paragraphs (b) and (c) of this Section 3.2, the Secretary receives payment of such reasonably estimated cost prior to the mailing of any notice of the meeting.

2

(e) Except as provided in the next sentence, any special meeting shall be held at such place, date and time as may be designated by the President, Chairman or Trustees, whoever has called the meeting. In the case of any special meeting called by the Secretary upon the request of Shareholders (a "Shareholder Requested Meeting"), such meeting shall be held at such place, date and time as may be designated by the Trustees; PROVIDED, however, that the date of any Shareholder Requested Meeting shall be not more than ninety (90) days after the record date for such meeting (the "Meeting Record Date"); and PROVIDED FURTHER that if the Trustees fail to designate, within thirty (30) days after the date that a valid Special Meeting Request is actually received by the Secretary (the "Delivery Date"), a date and time for a Shareholder Requested Meeting, then such meeting shall be held at 2:00
p.m. Central Time on the 90th day after the date the request for such meeting is actually received by the Trust or, if such 90th day is not a Business Day (as defined below), on the first preceding Business Day; and PROVIDED FURTHER that in the event that the Trustees fail to designate a place for a Shareholder Requested Meeting within thirty
(30) days after the Delivery Date, then such meeting shall be held at the principal office of the Trust. In fixing a date for any special meeting, the President, Chairman or Trustees may consider such factors as he, she, or they deem(s) relevant within the good faith exercise of business judgment, including, without limitation, the nature of the matters to be considered, the facts and circumstances surrounding any request for a meeting and any plan of the Trustees to call an annual meeting or a special meeting. In the case of any Shareholder Requested Meeting, if the Trustees fail to fix a Meeting Record Date that is a date within thirty (30) days after the Delivery Date, then the close of business on the 30th day after the Delivery Date shall be the Meeting Record Date.

(f) If at any time as a result of written revocations of requests for the special meeting, Shareholders of record (or their duly authorized agents) as of the Request Record Date entitled to cast less than the Special Meeting Percentage shall have delivered and not revoked requests for a special meeting, the Secretary may refrain from mailing the notice of the meeting or, if the notice of the meeting has been mailed, the Secretary may revoke the notice of the meeting at any time before ten (10) days prior to the meeting if the Secretary has first sent to all other requesting Shareholders written notice of such revocation and of intention to revoke the notice of the meeting. Any request for a special meeting received after a revocation by the Secretary of a notice of a meeting shall be considered a request for a new special meeting.

(g) The Chairman, the President or the Trustees may appoint regionally or nationally recognized independent inspectors of elections to act as the agent of the Trust for the purpose of promptly performing a ministerial review of the validity of any purported Special Meeting Request received by the Secretary. For the purpose of permitting the inspectors to perform such review, no such purported request shall be deemed to have been delivered to the Secretary until the earlier of (i) five (5) Business Days after receipt by the Secretary of such purported request and (ii) such date as the independent inspectors certify to the Trust that the valid requests received by the Secretary represent at least a majority of the issued and outstanding shares of stock that would be entitled to vote at such meeting. Nothing contained in this paragraph (g) shall in any way be construed to suggest or imply that the Trust or any Shareholder shall not be

3

entitled to contest the validity of any request, whether during or after such five (5) Business Day period, or to take any other action (including, without limitation, the commencement, prosecution or defense of any litigation with respect thereto, and the seeking of injunctive relief in such litigation).

3.3 Business Day. For purposes of these By-Laws, "Business Day" shall mean any day other than a Saturday, a Sunday or a day on which banking institutions in the State of New York are authorized or obligated by law or executive order to close.

3.4 Notice of Meetings. Notice of all meetings of the Shareholders, stating the time, place and purposes of the meeting, shall be given by the Trustees by mail or telegraphic or electronic means to each Shareholder at the Shareholder's address as recorded on the register of the Trust mailed at least ten (10) days and not more than ninety (90) days before the meeting, PROVIDED, HOWEVER, that notice of a meeting need not be given to a Shareholder to whom such notice need not be given under the proxy rules of the Commission under the 1940 Act and the Exchange Act; and PROVIDED, FURTHER, that notice of any Shareholder Requested Meeting shall be provided in a manner and time consistent with Section 3.2(e). Only the business stated in the notice of the meeting shall be considered at such meeting. Any adjourned meeting may be held and adjourned without further notice. No notice need be given to any Shareholder who shall have failed to inform the Trust of his current address or if a written waiver of notice, executed before or after the meeting by the Shareholder who shall have failed to inform the Trust of his current address or if a written waiver of notice, executed before or after the meeting by the Shareholder or his attorney thereunto authorized, is filed with the records of the meeting.

3.5 Record Date for Meetings and Other Purposes. Except as provided in
Section 3.2, for the purpose of determining the Shareholders who are entitled to notice of and to vote at any meeting, or to participate in any distribution, or for the purpose of any other action, the Trustees may from time to time close the transfer books for such period, not exceeding thirty (30) days, as the Trustees may determine; or without closing the transfer books the Trustees may fix a date not more than ninety (90) days prior to the date of any meeting of Shareholders or distribution or other action as a record date for the determination of the persons to be treated as Shareholders of record for such purposes, except for dividend payments which shall be governed by the Declaration of Trust.

3.6 Proxies. At any meeting of Shareholders, any holder of Shares entitled to vote thereat may vote by proxy, provided that no proxy shall be voted at any meeting unless it shall have been placed on file with the Secretary, or with such other officer or agent of the Trust as the Secretary may direct, for verification prior to the time at which such vote shall be taken. A proxy shall be deemed signed if the Shareholder's name is placed on the proxy, (whether by manual signature, typewriting, telegraphic transmission, facsimile, other electronic means or otherwise) by the Shareholder or the Shareholder's attorney-in-fact. Proxies may be recorded by any electronic, telephonic, internet or other telecommunication device except as otherwise provided in the Declaration of Trust. The placing of a Shareholder's name on a proxy pursuant to telephonic or electronically transmitted instructions pursuant to procedures reasonably designed to verify that such instructions have been authorized by the Shareholder shall constitute execution of the proxy by or on behalf of the Shareholder. Proxies may be solicited in the name

4

of one or more Trustees or one or more of the officers of the Trust. Only Shareholders of record shall be entitled to vote. As determined by the Trustees without the vote or consent of Shareholders, on any matter submitted to a vote of Shareholders each whole Share shall be entitled to one vote as to any matter on which it is entitled to vote and each fractional Share shall be entitled to a proportionate fractional vote. Without limiting their power to designate otherwise in accordance with the preceding sentence, the Trustees have established in the Declaration of Trust that each whole share shall be entitled to one vote as to any matter on which it is entitled by the Declaration of Trust to vote and fractional shares shall be entitled to a proportionate fractional vote. When any Share is held jointly by several persons, any one of them may vote at any meeting in person or by proxy in respect of such Share, but if more than one of them shall be present at such meeting in person or by proxy, and such joint owners or their proxies so present disagree as to any vote to be cast, such vote shall not be received in respect of such Share. A proxy, including a photographic or similar reproduction thereof and a telegram, cablegram, wireless or similar transmission thereof, purporting to be executed by or on behalf of a Shareholder shall be deemed valid unless challenged at or prior to its exercise, and the burden of proving invalidity shall rest on the challenger. If the holder of any such share is a minor or a person of unsound mind, and subject to guardianship or the legal control of any other person as regards the charge or management of such Share, he may vote by his guardian or such other person appointed or having such control, and such vote may be given in person or by proxy. Except as otherwise provided herein or in the Declaration of Trust or the Delaware Statutory Trust Act, 12 Del. C. ss.ss. 3801 et seq., all matters relating to the giving, voting or validity of proxies shall be governed by the General Corporation Law of the State of Delaware relating to proxies, and judicial interpretations thereunder, as if the Trust were a Delaware corporation and the Shareholders were shareholders of a Delaware corporation.

3.7 Inspection of Books. The Trustees shall from time to time determine whether and to what extent, and at what times and places, and under what conditions and regulations the accounts and books of the Trust or any of them shall be open to the inspection of the Shareholders; and no Shareholder shall have any right to inspect any account or book or document of the Trust except as conferred by law or otherwise by the Trustees or by resolution of the Shareholders.

3.8 Application of This Article. Meetings of Shareholders shall consist of Shareholders of any Series (or Class thereof) or of all Shareholders, as determined pursuant to the Declaration of Trust, and this Article 3 shall be construed accordingly.

3.9 Nominations and Proposals by Shareholders.

(a) Annual Meetings of Shareholders.

(1) Nominations of persons for election as a Trustee and the proposal of business to be considered by the Shareholders may be made at an annual meeting of Shareholders
(i) pursuant to the Trust's notice of meeting, (ii) by or at the direction of the Trustees or (iii) by any Shareholder of the Trust who was a Shareholder of record both at the time of giving of notice provided for in this Section 3.9(a) and at the time of the annual meeting, who is entitled to vote at the

5

meeting and who complied with the notice procedures set forth in this Section 3.9(a).

(2) For nominations for election to the Trustees or other business to be properly brought before an annual meeting by a Shareholder pursuant to clause (iii) of paragraph (a)(1) of this Section 3.9, the Shareholder must have given timely notice thereof in writing to the Secretary of the Trust and such other business must otherwise be a proper matter for action by Shareholders. To be timely, a Shareholder's notice must be delivered to the Secretary at the principal executive office of the Trust by not later than the close of business on the 90th day prior to the first anniversary of the date of mailing of the notice for the preceding year's annual meeting nor earlier than the close of business on the 120th day prior to the first anniversary of the date of mailing of the notice for the preceding year's annual meeting; provided, however, that in the event that the date of the mailing of the notice for the annual meeting is advanced or delayed by more than thirty (30) days from the anniversary date of the mailing of the notice for the preceding year's annual meeting, notice by the Shareholder to be timely must be so delivered not earlier than the close of business on the 120th day prior to the date of mailing of the notice for such annual meeting and not later than the close of business on the later of the 90th day prior to the date of mailing of the notice for such annual meeting or the 10th day following the day on which public announcement of the date of mailing of the notice for such meeting is first made by the Trust. In no event shall the public announcement of a postponement of the mailing of the notice for such annual meeting or of an adjournment or postponement of an annual meeting to a later date or time commence a new time period for the giving of a Shareholder's notice as described above. A Shareholder's notice to be proper must set forth (i) as to each person whom the Shareholder proposes to nominate for election or reelection as a trustee (A) the name, age, business address and residence address of such person, (B) the class and number of shares of stock of the Trust that are beneficially owned or owned of record by such person and (C) all other information relating to such person that is required to be disclosed in solicitations of proxies for election of trustees in an election contest, or is otherwise required, in each case pursuant to Regulation 14A (or any successor provision) under the Exchange Act (including such person's written consent to being named in the proxy statement as a nominee and to serving as a trustee if elected); (ii) as to any other business that the Shareholder proposes to bring before the meeting, a description of the business desired to be brought before the meeting, the reasons for conducting such business at the meeting and any material interest in such business of such Shareholder (including any anticipated benefit to the Shareholder therefrom) and of each beneficial owner, if any, on whose behalf the proposal is made; and (iii) as to the Shareholder giving the notice and each beneficial owner, if any, on whose behalf the nomination or proposal is made, (x) the name and address of such Shareholder, as they appear on the Trust's stock ledger and current name and address, if different, and of such beneficial owner, and (y) the class and number of shares of stock of the Trust which are owned beneficially and of record by such Shareholder and such beneficial owner.

6

(3) Notwithstanding anything in the second sentence of paragraph (a)(2) of this Section 3.9 to the contrary, in the event that the number of trustees to be elected to the Board of Trustees is increased and there is no public announcement by the Trust of such action or specifying the size of the increased Trustees at least one hundred (100) days prior to the first anniversary of the date of mailing of the notice for the preceding year's annual meeting, a Shareholder's notice required by this Section 3.9(a) shall also be considered timely, but only with respect to nominees for any new positions created by such increase, if the notice is delivered to the Secretary at the principal executive offices of the Trust not later than the close of business on the 10th day immediately following the day on which such public announcement is first made by the Trust.

(b) Special Meetings of Shareholders. Only such business shall be conducted at a special meeting of Shareholders as shall have been brought before the meeting pursuant to the Trust's notice of meeting. Nominations of persons for election to the Trustees may be made at a special meeting of Shareholders at which trustees are to be elected (i) pursuant to the Trust's notice of meeting, (ii) by or at the direction of the Trustees or (iii) provided that the Trustees have determined that trustees shall be elected at such special meeting, by any Shareholder of the Trust who is a Shareholder of record both at the time of giving of notice provided for in this Section 3.9(b) and at the time of the special meeting, who is entitled to vote at the meeting and who complied with the notice procedures set forth in this Section
3.9(b). In the event the Trust calls a special meeting of Shareholders for the purpose of electing one or more Trustees, any such Shareholder may nominate a person or persons (as the case may be) for election to such position as specified in the Trust's notice of meeting, if the Shareholder's notice containing the information required by paragraph
(a)(2) of this Section 3.9 shall have been delivered to the Secretary at the principal offices of the Trust not earlier than the close of business on the 120th day prior to such special meeting and not later than the close of business on the later of the 90th day prior to such special meeting or the 10th day following the day on which public announcement is first made of the date of the special meeting and the nominees proposed by the Trustees to be elected at such meeting. In no event shall the public announcement of a postponement or adjournment of a special meeting to a later date or time commence a new time period for the giving of a Shareholder's notice as described above.

(c) General. Only such persons who are nominated in accordance with the procedures set forth in this Section 3.9 shall be eligible to serve as trustee, and only such business shall be conducted at a meeting of Shareholders as shall have been brought before the meeting in accordance with the procedures set forth in this Section 3.9. The chairman of the meeting shall have the power and duty to determine whether a nomination or any other business proposed to be brought before the meeting was made or proposed, as the case may be, in accordance with the procedures set forth in this Section 3.9 and, if any proposed nomination or other business is not in compliance with this Section 3.9, to declare that such nomination or proposal shall be disregarded.

For purposes of this Section 3.9, (a) the "date of mailing of the notice" shall mean the date of the proxy statement for the solicitation of proxies for election of trustees and

7

(b) "public announcement" shall mean disclosure (i) in a press release either transmitted to the principal securities exchange on which Shares of the Trust's common stock are traded or reported by a recognized news service or (ii) in a document publicly filed by the Trust with the Commission.

(d) Compliance With State and Federal Law. Notwithstanding the foregoing provisions of this Section 3.9, a Shareholder shall also comply with all applicable requirements of state law and of the Exchange Act and the rules and regulations thereunder with respect to the matters set forth in this Section 3.9. Nothing in this Section 3.9 shall be deemed to affect any right of a Shareholder to request inclusion of a proposal in, nor the right of the Trust to omit a proposal from, the Trust's proxy statement pursuant to Rule 14a-8 (or any successor provision) under the Exchange Act.

3.10 Abstentions and Broker Non-Votes. Outstanding Shares represented in person or by proxy (including Shares which abstain or do not vote with respect to one or more of any proposals presented for Shareholder approval) will be counted for purposes of determining whether a quorum is present at a meeting. Abstentions will be treated as Shares that are present and entitled to vote for purposes of determining the number of Shares that are present and entitled to vote with respect to any particular proposal, but will not be counted as a vote in favor of such proposal. If a broker or nominee holding Shares in "street name" indicates on the proxy that it does not have discretionary authority to vote as to a particular proposal, those Shares will not be considered as present and entitled to vote with respect to such proposal.

3.11 Action without Meeting. Any action which may be taken by Shareholders may be taken without a meeting if a majority of Outstanding Shares entitled to vote on the matter (or such larger proportion thereof as shall be required by law, the Declaration of Trust or these By-laws) consent to the action in writing and the written consents are filed with the records of the meetings of Shareholders. Such consents shall be treated for all purposes as a vote taken at a meeting of Shareholders.

ARTICLE 4

TRUSTEES

4.1 Meetings of the Trustees. The Trustees may in their discretion provide for regular or stated meetings of the Trustees. Notice of regular or stated meetings need not be given. Meetings of the Trustees other than regular or stated meetings shall be held whenever called by the President, the Chairman or by any two of the Trustees, at the time then in office. Notice of the time and place of each meeting other than regular or stated meetings shall be given by the Secretary or an Assistant Secretary or by the officer or Trustee calling the meeting and shall be mailed, postage prepaid, to each Trustee at least three
(3) days before the meeting, or shall be given by telephone, cable, wireless, facsimile or other electronic mechanism by which receipt thereof can be confirmed to each Trustee at his business address, or personally delivered to him at least one (1) day before the meeting. Such notice may, however, be waived by any Trustee. Notice of a meeting need not be given to any Trustee if a written waiver of notice, executed by him before or after the meeting, is filed with the records of the meeting, or to any Trustee who attends the meeting without protesting prior thereto or at its commencement the lack of notice to

8

him. A notice or waiver of notice need not specify the purpose of any meeting. The Trustees may meet by means of a telephone conference circuit or similar communications equipment by means of which all persons participating in the meeting can hear each other at the same time and participation by such means shall be deemed to have been held at a place designated by the Trustees at the meeting. Participation in a telephone conference meeting shall constitute presence in person at such meeting. Any action required or permitted to be taken at any meeting of the Trustees may be taken by the Trustees without a meeting if a majority of the Trustees then in office (or such higher number of Trustees as would be required to act on the matter under the Declaration of Trust, these By-Laws or applicable law if a meeting were held) consent to the action in writing and the written consents are filed with the records of the Trustees' meetings. Such consents shall be treated as a vote for all purposes. Notwithstanding the foregoing, all actions of the Trustees shall be taken in compliance with the provisions of the 1940 Act.

4.2 Quorum and Manner of Acting. A majority of the Trustees then in office shall be present in person at any regular or special meeting of the Trustees in order to constitute a quorum for the transaction of business at such meeting and (except as otherwise required by law, the Declaration of Trust or these By-Laws) the act of a majority of the Trustees present at any such meeting, at which a quorum is present, shall be the act of the Trustees. In the absence of a quorum, a majority of the Trustees present may adjourn the meeting from time to time until a quorum shall be present. Notice of an adjourned meeting need not be given.

4.3 Eligibility to Serve. Each Trustee who is not an interested person of the Trust, as defined in the 1940 Act, shall retire as a Trustee as of the end of the calendar year in which the Trustee attains the age of 70 years.

ARTICLE 5

COMMITTEES

5.1 Executive and Other Committees. The Trustees by vote of a majority of all the Trustees may elect from their own number an Executive Committee to consist of not less than two members to hold office at the pleasure of the Trustees, which shall have the power to conduct the current and ordinary business of the Trust while the Trustees are not in session, including the purchase and sale of securities and the designation of securities to be delivered upon redemption of Shares of the Trust or a Series thereof, and such other powers of the Trustees as the Trustees may delegate to them, from time to time, except those powers which by law, the Declaration of Trust or these By-Laws they are prohibited from delegating. The Trustees may also elect from their own number other Committees from time to time; the number composing such Committees, the powers conferred upon the same (subject to the same limitations as with respect to the Executive Committee) and the term of membership on such Committees to be determined by the Trustees. The Trustees may designate a chairman of any such Committee. In the absence of such designation the Committee may elect its own Chairman.

5.2 Other Committees. The Trustees by vote of a majority of all the Trustees may elect from their own number other Committees from time to time to consist of one or more Trustees to hold office at the pleasure of the Trustees, which Committees shall have such power and duties as the Board of Trustees may, by resolution, prescribe, subject to the same limitations

9

as with respect to the Executive Committee. The terms of membership on such Committees and the termination or circumstances giving rise to the termination of such Committees shall be determined by the Trustees. The Trustees may designate a chairman of any such Committee. In the absence of such designation the Committee may elect its own chairman.

5.3 Meetings Quorum and Manner of Acting. The Trustees may (1) provide for stated meetings of any Committee, (2) specify the manner of calling and notice required for special meetings of any Committee, (3) specify the number of members of a Committee required to constitute a quorum and the number of members of a Committee required to exercise specified powers delegated to such Committee, (4) authorize the making of decisions to exercise specified powers by written assent of the requisite number of members of a Committee without a meeting, and (5) authorize the members of a Committee to meet by means of a telephone conference circuit. Unless otherwise provided by the Trustees, (1) any Committee meeting may be held by conference telephone, teleconference or other electronic media or communications equipment by means of which all persons participating in the meeting can communicate with each other and (2) each Committee may make decisions to exercise specified powers by written assent of the requisite number of members of a Committee without a meeting. Each Committee shall keep regular minutes of its meetings and records of decisions taken without a meeting and cause them to be recorded in a book designated for that purpose and kept at the principal executive office of the Trust.

ARTICLE 6

OFFICERS

6.1 General Provisions. The officers of the Trust shall be a President, a Treasurer and a Secretary, who shall be elected by the Trustees. The Trustees may elect such other officers or agents as the business of the Trust may require, including a Chairman of the Board ("Chairman") one or more Vice Presidents, one or more Assistant Secretaries, and one or more Assistant Treasurers. The Trustees may delegate to any officer or Committee the power to appoint any subordinate officers or agents.

6.2 Term of Office and Qualifications. Except as otherwise provided by law, the Declaration of Trust or these By-Laws, the President, the Treasurer, the Secretary and all other officers shall each hold office at the pleasure of the Board of Trustees or until his successor shall have been duly elected and qualified. The Secretary and the Treasurer may be the same person. A Vice President and the Treasurer or a Vice President and the Secretary may be the same person, but the offices of Vice President, Secretary and Treasurer shall not be held by the same person. The President shall hold no other office, however, the President may also serve as Chairman. The Chairman, if there be one, shall be a Trustee and may but need not be a shareholder. Except as above provided, any two offices may be held by the same person. Any officer may be but none need be a Trustee or Shareholder.

6.3 Removal. The Trustees, at any regular or special meeting of the Trustees, may remove any officer with or without cause, by a vote of a majority of the Trustees then in office. Any officer or agent appointed by an officer or committee may be removed with or without cause by such appointing officer or committee.

10

6.4 Powers and Duties of the Chairman. The Trustees may, but need not, appoint from among their number a Chairman. When present the Chairman shall preside at the meetings of the Shareholders and of the Trustees. The Chairman may call meetings of the Trustees and of any committee thereof whenever he deems it necessary. The Chairman shall have, with the President, general supervision over the business and policies of the Trust, subject to the limitations imposed upon the President, as provided in Section 6.5.

6.5 Powers and Duties of the President. Subject to the powers of the Chairman, if there be such an officer, the President shall be the principal executive officer of the Trust. The President may call meetings of the Trustees and of any Committee thereof when he deems it necessary and, in the absence of the Chairman, shall preside at all meetings of the Shareholders and the Trustees. Subject to the control of the Trustees, the Chairman and any Committees of the Trustees, within their respective spheres, as provided by the Trustees, the President shall at all times exercise a general supervision and direction over the affairs of the Trust. The President shall have the power to employ attorneys and counsel for the Trust or any Series or Class thereof, and other advisers and agents for the Trust and to employ such subordinate officers, agents, clerks and employees as the President may find necessary to transact the business of the Trust or any Series or Class thereof. The President shall also have the power to grant, issue, execute or sign such powers of attorney, proxies or other documents as may be deemed advisable or necessary in furtherance of the interests of the Trust or any Series or Class thereof. The President shall have such other powers and duties, as from time to time may be conferred upon or assigned to him by the Trustees.

6.6 Powers and Duties of Vice Presidents. In the absence or disability of the President, the Vice Presidents, and in the order designated by the Trustees, shall perform all the duties and may exercise any of the powers of the President, subject to the control of the Trustees. Each Vice President shall perform such other duties as may be assigned to him or her from time to time by the Trustees or the President. Any Vice President may be designated the chief financial officer of the Trust.

6.7 Powers and Duties of the Treasurer. The Treasurer shall be the chief accounting officer of the Trust. The Treasurer shall deliver all funds of the Trust or any Series or Class thereof which may come into the Treasurer's hands to such Custodian as the Trustees may employ. The Treasurer shall render a statement of condition of the finances of the Trust or any Series or Class thereof to the Trustees as often as the Trustees shall require the same and the Treasurer shall in general perform all the duties incident to the office of a Treasurer and such other duties as from time to time may be assigned to the Treasurer by the Trustees. The Treasurer shall give a bond for the faithful discharge of the Treasurer's duties, if required so to do by the Trustees, in such sum and with such surety or sureties as the Trustees shall require. The Treasurer may be designated the chief financial officer of the Trust.

6.8 Powers and Duties of the Secretary. The Secretary shall attend all meetings of the Trustees and Shareholders; the Secretary shall keep the minutes of all meetings of the Trustees and of the Shareholders in proper books provided for that purpose; the Secretary shall have custody of the seal of the Trust; the Secretary shall have charge of the Share transfer books, lists and records unless the same are in the charge of a transfer agent. The Secretary shall attend to the giving and serving of all notices by the Trust in accordance with the provisions of these By-

11

Laws and as required by law; and subject to these By-Laws, the Secretary shall in general perform all duties incident to the office of Secretary and such other duties as from time to time may be assigned to the Secretary by the Trustees.

6.9 Powers and Duties of Assistant Treasurers. In the absence or disability of the Treasurer, any Assistant Treasurer designated by the Trustees shall perform all the duties, and may exercise any of the powers, of the Treasurer. Each Assistant Treasurer shall perform such other duties as from time to time may be assigned to such Assistant Treasurer by the Trustees. Each Assistant Treasurer performing the duties and exercising the powers of the Treasurer, if any, shall give a bond for the faithful discharge of his duties, if required so to do by the Trustees, in such sum and with such surety or sureties as the Trustees shall require.

6.10 Powers and Duties of Assistant Secretaries. In the absence or disability of the Secretary, any Assistant Secretary designated by the Trustees shall perform all the duties, and may exercise any of the powers, of the Secretary. Each Assistant Secretary shall perform such other duties as from time to time may be assigned to such officer by the Trustees.

6.11 Compensation of Officers and Trustees and Members of the Advisory Board. Subject to any applicable provisions of the Declaration of Trust, the compensation of the officers and Trustees and members of any advisory board shall be fixed from time to time by the Trustees or, in the case of officers, by any Committee or officer upon whom such power may be conferred by the Trustees. No officer shall be prevented from receiving such compensation as such officer by reason of the fact that the officer is also a Trustee.

ARTICLE 7

FISCAL YEAR

The fiscal year of the Trust shall end on such date as the Trustees shall from time to time determine.

ARTICLE 8

SEAL

The Trustees may, but shall not be required to, adopt a seal which shall be in such form and shall have such inscription thereon as the Trustees may from time to time prescribe.

ARTICLE 9

SUFFICIENCY AND WAIVERS OF NOTICE

Whenever any notice whatever is required to be given by law, the Declaration of Trust or these By-Laws, a waiver thereof in writing, signed by the person or persons entitled to said notice, whether before or after the time stated therein, shall be deemed equivalent thereto. A notice shall be deemed to have been sent by mail, telegraph or cable when it has been delivered to a representative of any company holding itself out as capable of sending notice by such means

12

with instructions that it be so sent, or at the time of confirmation if sent by wireless, facsimile or other electronic means.

ARTICLE 10

CERTIFICATES

If so determined by resolution of the Board of Trustees, each Shareholder of the Trust shall be entitled upon request to have a certificate or certificates, in such form as shall be approved by the Board of Trustees, representing the number of Shares of the Trust owned by the Shareholder, provided, however, that certificates for fractional shares will not be delivered in any case. Certificates representing Shares shall be signed by or in the name of the Trust by the President or a Vice President or the Chairman and by the Secretary or an Assistant Secretary or the Treasurer or an Assistant Treasurer. Any or all of the signatures may be a facsimile. In case any officer, transfer agent or registrar who has signed or whose facsimile signature has been placed upon a certificate shall have ceased to be such officer, transfer agent or registrar before such certificate shall be issued, it may be issued by the Trust with the same effect as if such officer, transfer agent or registrar were still in the office at the date of issue.

ARTICLE 11

AMENDMENT

These By-Laws, or any of them, may be altered, amended or repealed, or new By-Laws may be adopted by the Trustees, provided, however, that no By-law may be amended, adopted or repealed by the Trustees if such amendment, adoption or repeal requires, pursuant to law, the Declaration of Trust or these By-Laws, a vote of the Shareholders.

Adopted: March 12, 2004

END OF BY-LAWS

13

Exhibit s

POWER OF ATTORNEY

The person whose signature appears below hereby appoints James S. Hamman, Jr. and John P. Calamos and each of them, any of whom may act without the joinder of the others, as such person's attorney-in-fact to sign and file on such person's behalf individually and in the capacity stated below such registration statements, amendments, exhibits, applications and other documents with the Securities and Exchange Commission or any other regulatory authority as may be desirable or necessary in connection with the public offering of shares of Calamos Global Total Return Fund.

       SIGNATURE                          TITLE                   DATE

/s/ John E. Neal                         TRUSTEE               March 12, 2004
-------------------------------
John E. Neal

                                POWER OF ATTORNEY

The person whose signature appears below hereby appoints James S. Hamman, Jr. and John P. Calamos and each of them, any of whom may act without the joinder of the others, as such person's attorney-in-fact to sign and file on such person's behalf individually and in the capacity stated below such registration statements, amendments, exhibits, applications and other documents with the Securities and Exchange Commission or any other regulatory authority as may be desirable or necessary in connection with the public offering of shares of Calamos Global Total Return Fund.

       SIGNATURE                          TITLE                   DATE

/s/ Joe F. Hanauer                       TRUSTEE               March 12, 2004
-------------------------------
Joe F. Hanauer

                                POWER OF ATTORNEY

The person whose signature appears below hereby appoints James S. Hamman, Jr. and John P. Calamos and each of them, any of whom may act without the joinder of the others, as such person's attorney-in-fact to sign and file on such person's behalf individually and in the capacity stated below such registration statements, amendments, exhibits, applications and other documents with the Securities and Exchange Commission or any other regulatory authority as may be desirable or necessary in connection with the public offering of shares of Calamos Global Total Return Fund.

       SIGNATURE                          TITLE                   DATE

/s/ Nick P. Calamos                      TRUSTEE               March 12, 2004
-------------------------------
Nick P. Calamos

                                POWER OF ATTORNEY

The person whose signature appears below hereby appoints James S. Hamman, Jr. and John P. Calamos and each of them, any of whom may act without the joinder of the others, as such person's attorney-in-fact to sign and file on such person's behalf individually and in the capacity stated below such registration statements, amendments, exhibits, applications and other documents with the Securities and Exchange Commission or any other regulatory authority as may be desirable or necessary in connection with the public offering of shares of Calamos Global Total Return Fund.

       SIGNATURE                          TITLE                   DATE

/s/ Weston W. Marsh                      TRUSTEE               March 12, 2004
-------------------------------
Weston W. Marsh

                                POWER OF ATTORNEY

The person whose signature appears below hereby appoints James S. Hamman, Jr. and John P. Calamos and each of them, any of whom may act without the joinder of the others, as such person's attorney-in-fact to sign and file on such person's behalf individually and in the capacity stated below such registration statements, amendments, exhibits, applications and other documents with the Securities and Exchange Commission or any other regulatory authority as may be desirable or necessary in connection with the public offering of shares of Calamos Global Total Return Fund.

       SIGNATURE                          TITLE                   DATE

/s/ William Rybak                        TRUSTEE               March 12, 2004
-------------------------------
William Rybak