State Street Corp. has further expanded its relationship with Illinois-based Calamos Investments to 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, according to a statement.

"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."

Barrington Partners, based in Boston, assisted Calamos in the due diligence and selection process, according to a statement.