Exhibit 99.(g)(11)

December 14, 2021

State Street Bank and Trust Company

One Iron Street

Boston, MA 02111

Attention: Scott Shirrell, Vice President

Re: New Portfolio

Ladies and Gentlemen:

Please be advised that CALAMOS INVESTMENT TRUST has established a new series of shares to be known as CALAMOS GLOBAL SUSTAINABLE EQUITIES FUND (the “New Portfolio”).

In accordance with Section 19.6 (Additional Portfolios) of the Master Custodian Agreement dated as of September 11, 2009 (as amended, modified or supplemented from time to time, the “Agreement”) between each management investment company identified on Appendix A thereto and State Street Bank and Trust Company, the undersigned Funds hereby requests that your bank act as Custodian for the New Portfolio under the terms of the Agreement. In connection with such request, the undersigned Fund hereby confirms to you, as of the date hereof, its representations and warranties set forth in Section 19.7 of the Agreement.

Attached as Appendix A hereto is a replacement of “Appendix A” to the Agreement, effective as of the date set forth below.

Kindly indicate your acceptance of the foregoing by executing two copies of this letter agreement, returning one to the Fund and retaining one for your records.

Sincerely,

CALAMOS INVESTMENT TRUST

By: /s/ Stephen Atkins

Name: Stephen Atkins

Title:   Treasurer, Duly Authorized

Agreed and Accepted:

STATE STREET BANK AND TRUST COMPANY

By:	/s/ Suzanne M. Hinckley
Name:	Suzanne M. Hinckley
Title:	Senior Vice President

Effective Date: 12/16/2021

APPENDIX A

TO

MASTER CUSTODIAN AGREEMENT

MANAGEMENT INVESTMENT COMPANIES REGISTERED WITH THE SEC AND PORTFOLIOS THEREOF, IF ANY

CALAMOS ADVISORS TRUST
Calamos Growth and Income Portfolio	36-7271106
CALAMOS ETF TRUST
CALAMOS INVESTMENT TRUST
Calamos Convertible Fund	36-3316238
Calamos Dividend Growth	46-2951829
Calamos Evolving World Growth Fund	26-2192228
Calamos Global Convertible	47-2271491
Calamos Global Equity Fund	20-8166626
Calamos Global Opportunities Fund	36-4088206
Calamos Global Sustainable Equities Fund	87-3159402
Calamos Growth and Income Fund	36-3575418
Calamos Growth Fund	36-3723359
Calamos Hedged Equity Fund	47-2255361
Calamos High Income Opportunities Fund	36-4307069
Calamos International Growth Fund	20-2395043
Calamos Market Neutral Income Fund	36-3723358
Calamos Phineus/Long Short Fund	47-5668954
Calamos Select Fund	22-3848966
Calamos Short-Term Bond Fund	83-0775729
Calamos Timpani Small Cap Growth Fund	83-3325222
Calamos Timpani SMID Growth Fund	83-4647954
Calamos Total Return Bond Fund	20-8872705
Calamos Strategic Total Return Fund	04-3785941
Calamos Convertible Opportunities and Income Fund	03 -0426532
Calamos Convertible and High Income Fund	02 -0683363
Calamos Global Total Return Fund	20-3377281
Calamos Global Dynamic Income Fund	20-8819776
Calamos Dynamic Convertible and Income Fund	47-1549409
Calamos Long/Short Equity & Dynamic Income Trust	82-2860404