X0303 4 2009-05-27 0 0001397821 Duff & Phelps Corp DUF 0001407188 Levy Sander M. C/O VESTAR CAPITAL PARTNERS IV, L.P. 245 PARK AVENUE, 41ST FLOOR NEW YORK NY 10167 1 0 0 0 Duff & Phelps Acquisitions, LLC New Class A Units 2009-05-27 4 J 0 1590001 14.75 D Class A common stock 1590001 4993020 I see footnotes 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. Beneficially owned by Vestar capital Partners IV, L.P. and Vestar/D&P Holdings, LLC. The address of Vestar Capital Partners IV, L.P. and Vestar/D&P Holdings, LLC is 245 Park Avenue, 41st Floor, New York, NY 10167. As an officer of Vestar Capital Partners IV, L.P. and Vestar/D&P Holdings, LLC, Mr. Levy may be deemed to share beneficial ownership of the shares held respectively by Vestar Capital Partners, IV, L.P. and Vestar/D&P Holdings, LLC. Mr. Levy disclaims beneficial ownership of such shares and any other shares held by affiliates of Vestar Capital Partners except to the extent of his pecuniary interest therein. /s/ Edward S. Forman as Attorney-in-Fact for Sander M. Levy Executive VP, General Counsel, Secretary 2009-05-28