Private equity firm the Carlyle Group LP (Nasdaq: CG) teamed with several other financial buyers and agreed, late Dec. 30, to purchase investment banking firm Duff & Phelps Corp. (NYSE: DUF) for about $665.5 million.

The consortium includes Greenwich, Conn.-based Stone Point Capital LLC, Swiss bank Pictet & Cie and Luxembourg-based Edmond de Rothschild Group.

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