Duff & Phelps Corporation (NYSE: DUF), a leading independent financial advisory and investment banking firm, today announced that it has agreed to sell 2,500,000 shares in an underwritten public offering of Class A common stock.

Duff & Phelps intends to use the net proceeds from this offering to redeem certain of the units in Duff & Phelps Acquisitions, LLC that are held by existing unit holders. Such holders who elect to be redeemed with the proceeds from this offering will agree to a lock-up for a period of 90 days after the date of the prospectus supplement for this offering. Existing unit holders, other than executive officers and directors, who elect not to be redeemed with the proceeds from this offering will not be subject to such lock-up and their units may be exchangeable on November 16, 2009 for an equal number of shares of Class A common stock. Duff & Phelps has filed a registration statement in order to permit the resale of such shares from time to time, subject to certain blackouts and other restrictions.