Duff & Phelps Corp. (DUF) agreed to be purchased by a private investor consortium consisting of entities or funds managed by private-equity firm Carlyle Group LP (CG), Stone Point Capital, Pictet & Cie and Edmond de Rothschild Group.

The consortium plans to acquire Duff & Phelps for $15.55 a share in cash, a 19.2% premium to Friday's close of $13.05, in a transaction valued at about $665.5 million.

Duff & Phelps is based in New York and known mainly for its valuation services to government entities, hedge funds and public companies. The firm was a valuation adviser to the examiner in the bankruptcy of Lehman Brothers Holdings Inc. Duff & Phelps also provided valuation advice to the U.S. Congressional Oversight Committee's Troubled Asset Relief Program effort.

Shares of Duff & Phelps have traded near their initial public offering price of $16. That is one of the reasons executives thought Duff & Phelps would do better as a privately owned entity, a person familiar with the negotiations told The Wall Street Journal.

The transaction, which Duff & Phelps's board has approved, is expected to close in the first half of 2013, subject to customary closing conditions. The agreement provides for a breakup fee of about $6.65 million if Duff & Phelps terminates the agreement prior to March 8.

All members of the senior management team have agreed to remain employed by, and invest in the equity of, Duff & Phelps following the closing of the deal.

The board will consist of nine members: two representatives each from the management team, Carlyle Group and Stone Point Capital, plus three independent directors. No single member of the consortium will own more than 35% of the company.

--Anupreeta Das and Ryan Dezember contributed to this article.

Write to Lisa Reynolds at lisa.reynolds@dowjones.com

Subscribe to WSJ: http://online.wsj.com?mod=djnwires

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