UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 14A
Proxy Statement Pursuant to Section 14(a) of
the Securities
Exchange Act of 1934 (Amendment No. )
Filed by the Registrant ☒
Filed by a Party other than the Registrant ☐
Check the appropriate box:
| ☐ |
Preliminary Proxy Statement |
| ☐ |
Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) |
| ☐ |
Definitive Proxy Statement |
| ☒ |
Definitive Additional Materials |
| ☐ |
Soliciting Material Pursuant to §240.14a-12 |
CALAMOS®
INVESTMENT TRUST
CALAMOS®
ADVISORS TRUST
CALAMOS®
ANTETOKOUNMPO SUSTAINABLE EQUITIES TRUST
CALAMOS®
ETF TRUST
(Name of Registrant as Specified In Its Charter)
(Name of Person(s) Filing Proxy Statement,
if other than the Registrant)
Payment of Filing Fee (Check the appropriate box):
☒ No fee required.
☐ Fee paid previously with preliminary materials.
☐ Fee computed
on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.
July
30, 2025
CALAMOS
INVESTMENT TRUST
CALAMOS®
ADVISORS TRUST
CALAMOS®
ANTETOKOUNMPO SUSTAINABLE EQUITIES TRUST
CALAMOS®
ETF TRUST
2020
Calmos Court
Naperville,
Illinois 60563-2787
Dear Valued
Shareholder:
As
a shareholder of one or more of the Calamos Funds, you should have recently received in the mail or through email, important proxy material
requesting your vote on several proposals relating to the modernization of the Calamos Funds. The proposals, as set forth on the enclosed
proxy form and in the proxy statement you received, are designed to streamline, improve efficiencies or provide operational flexibility
and reduce cost to shareholders. These proposals along with the election of Trustees will be presented at the Special Meeting of Shareholders
scheduled to be held on Tuesday, August 19, 2025 at 3:00pm Central Time.
ACCORDING
TO OUR RECORDS WE HAVE NOT RECEIVED YOUR PROXY VOTE. Voting will ensure your shares and your say are represented at the Special Meeting.
Please review the proxy material and vote your shares accordingly. Remember, your vote is important enough to the outcome of this Special
Meeting for us to be reaching out to you.
YOU
CAN VOTE USING ONE OF THE CONVENIENT OPTIONS BELOW:
| ● | Online:
Visit the website indicated on the enclosed proxy card. |
| ● | Phone:
Call (800) 758-5880. You can speak to a representative to place your vote. |
| ● | Mail:
Sign, date and return the enclosed proxy card in the postage-paid envelope provided. |
VOTING
IS EASY AND ONLY TAKES A MOMENT OF YOUR TIME. By casting your proxy vote now, you will ensure that your shares are represented and
that we will not need to reach out to you further relating to the voting process. Detailed information about the Special Meeting of Shareholders
and the proposals to be voted on can be found in the proxy statement, or online at: vote.proxyonline.com/Calamos/docs
If
you have any questions about the proposals, you may contact us at (800) 758-5880. Representatives are available 9:00 am to 10:00
pm Eastern Time, Monday through Friday and Saturday from 10:00 am to 9:00 pm Eastern Time.
Thank
you for your time and consideration.
Sincerely,
John
P. Calamos Sr.
Trustee
and President
RXXXXX
To:
CC:
Subject:
Calamos Funds Joint Special Meeting of Shareholders August 19, 2025
CALAMOS
INVESTMENT TRUST
CALAMOS
ADVISORS TRUST
CALAMOS ETF TRUST
CALAMOS
ANTETOKOUNMPO SUSTAINABLE EQUITIES TRUST
NOTICE
OF JOINT SPECIAL MEETING OF SHAREHOLDERS
AUGUST
19, 2025
July
30, 2025
Dear
Shareholder:
A
joint special meeting of shareholders of each trust named above (each, a “Trust”), on behalf of each fund and portfolio organized
as a series of the Trusts (each, a “Fund,” and collectively, the “Funds”) has been called to be held in the Calamos
Café on the lower level of the offices of CALAMOS ADVISORS LLC, each Fund’s investment adviser, 2020 Calamos Court, Naperville,
Illinois, at 3:00 p.m., central time, on Tuesday, August 19, 2025.
Please
click the “VOTE HERE” button below to access and review the proxy material and cast your vote. If you prefer to receive
the proxy statement and proxy card in paper format to complete and return via U.S. mail, please contact us toll-free at (800)
758-5880. To facilitate
the timely delivery of your proxy, please make your request for a paper copy as soon as possible.
NOTE:
If you encounter any issues with the above button or do not see it, you may also log in directly by navigating to or clicking the link
below and, once there, enter your control number.
vote.proxyonline.com/Calamos/20679
Control Number: XXXXXXXXXXX
Shareholders
of record as of the close of business on June 20, 2025 are entitled to notice of, and to vote at, the Special Meeting (or any adjournment
of the meeting).
Important
Notice Regarding the Availability of Proxy Materials for the Meeting to be Held on August 19, 2025: This Notice and the Proxy Statement
are available on the Internet at www.Calamos.com/fundproxy.
By
Order of the Board of Trustees
of
each Trust,
Erik
D. Ojala
Secretary