Exhibit 99.1

FOR IMMEDIATE RELEASE

Contact:
Jennifer McGuffin, Public Relations Manager
Calamos Advisors LLC
Direct: 630.245.1780
Cell: 630.328.3566
Fax: 630.245.6840

jmcguffin@calamos.com

Calamos Investments Statement on ARPS lawsuit for Convertible Opportunities and Income Fund (NYSE: CHI)

Naperville, Illinois, September 14, 2010 — Calamos Investments announced that a law firm has filed a putative class action lawsuit, purportedly on behalf of a class of common shareholders of Calamos Convertible Opportunities and Income Fund (NYSE: CHI), alleging breach of fiduciary duty, aiding and abetting breach of fiduciary duty, and unjust enrichment in connection with the redemption of auction rate preferred securities following the collapse of auction markets in February 2008. The lawsuit was filed in the Circuit Court of Cook County, Illinois.

The named defendants include John P. Calamos, Sr., Calamos Asset Management, Calamos Advisors LLC, the Calamos Convertible Opportunities and Income Fund and six trustees. Calamos Advisors and Calamos Asset Management believe the lawsuit is without merit and intend to defend themselves vigorously against the charges.

A similar lawsuit, filed on behalf of the same plaintiff against the same defendants in the U.S. District Court for the Northern District of Illinois on July 15, 2010, was voluntarily dismissed by the plaintiff on September 7, 2010.

About Calamos

Calamos Investments is a globally diversified investment firm offering equity, fixed-income, convertible and alternative investment strategies, among others. The firm serves institutions and individuals around the world via separately managed accounts and a family of open-end and closed- end funds, providing a risk-managed approach to capital appreciation and income-producing strategies. For more information, visit www.calamos.com.

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