A consortium led by the Carlyle Group LP (Nasdaq: CG) has closed on a deal for New York investment banking firm Duff & Phelps Corp. for about $665.5 million.

The group includes Carlyle, Stone Point Capital LLC, a private equity firm headquartered in Greenwich, Conn., Pictet & Cie, a Swiss asset manager, and funds managed by Luxembourg-based Edmond de Rothschild Group. The target hopes to expand its international presence.

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