X0303 4 2009-05-27 0 0001397821 Duff & Phelps Corp DUF 0001321523 Forman Edward C/O DUFF & PHELPS CORPORATION 55 EAST 52ND STREET NEW YORK NY 10055 0 1 0 0 Executive VP, Gen. Cnsl., Sec. Duff & Phelps Acquisitions, LLC New Class A Units 2009-05-27 4 J 0 11057 14.75 D Class A common stock 11057 36611 D Pursuant to an exchange agreement entered into in connection with the closing of the initial public offering of Duff & Phelps Corporation (the "IPO"), holders of New Class A Units of Duff & Phelps Acquisitions, LLC ("DPA") issued in connection with the reorganization of DPA immediately prior to the consummation of the IPO (the "Reorganization") may exchange their New Class A Units for Class A common stock of Duff & Phelps Corporation on a one-for-one basis up to four times each year, subject to the vesting, minimum retained ownership requirements and transfer restrictions and customary conversion rate adjustments for splits, unit distributions and reclassifications contained in the exchange agreement. The New Class A Units listed in the table above were redeemed by Duff & Phelps Acquisitions, LLC using a portion of the net proceeds from Duff & Phelps Corporation's public offering of 8,050,000 shares of Class A common stock. /s/ Edward S. Forman Executive VP, General Counsel, Secretary 2009-05-28