X0303 4 2009-05-27 0 0001397821 Duff & Phelps Corp DUF 0001198861 KRUEGER HARVEY M 150 EAST 69TH STREET NEW YORK NY 10021 1 0 0 0 Duff & Phelps Acquisitions, LLC New Class A Units 2009-05-27 4 J 0 5154 14.75 D Class A common stock 5154 35920 D Duff & Phelps Acquisitions, LLC New Class A Units 2009-05-27 4 J 0 2857 14.75 D Class A common stock 2857 8944 I see footnote 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. Such Duff & Phelps Acquisitions, LLC New Class A Units are held by Mr. Krueger through Vestar/D&P Holdings, LLC. /s/ Edward S. Forman as Attorney-in-Fact for Harvey M. Krueger Executive VP, General Counsel, Secretary 2009-05-28