QUINCY, Mass. - State Street Corp. and Citigroup Inc. said Tuesday that they had begun a venture, CitiStreet, which specializes in retirement plan management and administration and which was announced in December.The venture, with 3,000 employees, merges State Street's retirement investment services unit and its Wellspring Resources with Citi's Copeland Cos.

The retirement investment services unit manages large corporate retirement plans, and State Street's Wellspring Resources specializes in employee benefits consulting. Citi's Copeland Cos. works with smaller plans.

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