Company Press Release

BOSTON, Dec 14, 2009 -- State Street Corporation (NYSE: STT), one of the world's leading providers of financial services to institutional investors, announced today that it has further expanded its relationship with Illinois-based Calamos Investments (NASDAQ: CLMS). State Street will provide custody, fund administration and securities lending services to Calamos' collective fund structures including Open and Closed End Mutual Funds, Dublin UCITS and private funds exceeding $21 billion in assets. With this consolidation, State Street now provides full back-office services for all of Calamos' collective fund structures.

"By further consolidating our operations with State Street, it provided us with a seamless model which has resulted in additional efficiencies in our processes, enabling us to better serve our clients," said Nimish Bhatt, senior vice president of Calamos Advisors LLC and CFO of Calamos Funds. "State Street understands our complex investments and associated accounting requirements. The consistency and expertise of its fund accounting and fund administration teams also ensure continuity of service quality for our funds."

"We have enjoyed our partnership with Calamos during the past five years and appreciate the value it sees in expanding our relationship to include additional services," said Alan Greene, executive vice president of State Street. "Growing our market share within the US mutual fund arena will help ensure we stay ahead of the changes in the industry and develop solutions for our customers."

State Street is the leading provider of fund accounting in the United States, servicing more than 40 percent of the mutual fund industry, and is the largest contributor of mutual fund NAV's to NASDAQ.

Barrington Partners, based in Boston, Mass., assisted Calamos in the due diligence and selection process.

Calamos Investments has more than $30.5 billion in assets under management and provides investment advisory services to institutions and individuals seeking superior risk-adjusted returns over the long term. With roots dating back to 1977, the company applies its proprietary investment process across an expanding range of investment strategies within the equity, global/international, balanced, high yield, convertible and alternative investment classes. Calamos Investments is listed on the Nasdaq Stock Market and trades under the symbol "CLMS." For more information, please visit http://www.calamos.com.

State Street Corporation (NYSE: STT) is one of the world's leading providers of financial services to institutional investors including investment servicing, investment management and investment research and trading. With $17.9 trillion in assets under custody and administration and $1.7 trillion in assets under management at September 30, 2009, State Street operates in 27 countries and more than 100 geographic markets worldwide. For more information, visit State Street's website at www.statestreet.com.

SOURCE: State Street Corporation

State Street Corporation

Carolyn Cichon, 617-664-8672