X0304 4 2012-03-01 1 0001397821 Duff & Phelps Corp DUF 0001091468 VESTAR CAPITAL PARTNERS IV LP 245 PARK AVENUE 41ST FLOOR NEW YORK NY 10167 0 0 1 0 0001413600 VESTAR/D&P HOLDINGS LLC 245 PARK AVENUE 41ST FLOOR NEW YORK NY 10167 0 0 1 0 0001413601 VESTAR ASSOCIATES IV, L.P. 245 PARK AVENUE 41ST FLOOR NEW YORK NY 10167 0 0 1 0 0001413602 VESTAR ASSOCIATES CORP IV 245 PARK AVENUE 41ST FLOOR NEW YORK NY 10167 0 0 1 0 Duff and Phelps Acquisitions, LLC New Class A Units 2012-03-01 4 J 0 1873522 D Duff and Phelps Corporation Class A common stock 1873522 2997633 D Duff and Phelps Acquisitions, LLC New Class A Units 2012-03-01 4 J 0 58939 D Duff and Phelps Corporation Class A common stock 58939 94301 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 and minimum retained ownership requirements, transfer restrictions and customary conversion rate adjustments for splits, unit distributions and reclassifications contained in the exchange agreement. The reported securities were called for redemption by the issuer at a price per unit equal to $13.38. These units are owned directly by Vestar Capital Partners IV, L.P. These units may be deemed to be beneficially owned by Vestar Associates Corporation IV, which is the general partner of Vestar Associates IV, L.P., which in turn is the general partner of Vestar Capital Partners IV, L.P. Such persons disclaim beneficial ownership of the units, except to the extent of their pecuniary interest therein, if any. These units are owned directly by Vestar / D&P Holdings LLC. These units may be deemed to be beneficially owned by Vestar Associates Corporation IV, which is the general partner of Vestar Associates IV, L.P., which is the general partner of Vestar Capital Partners IV, L.P., and the manager of Vestar/D&P Holdings LLC. Such persons disclaim beneficial ownership of the units, except to the extent of their pecuniary interest therein, if any. Vestar Capital Partners IV, L.P. By: Vestar Associates IV, L.P., its General Partner; By: Vestar Associates Corporation IV, its General Partner; By Sander Levy, its Managing Director, /s/ Sander Levy 2012-03-05 Vestar / D&P Holdings LLC By: Vestar Capital Partners IV, L.P., its Managing Member; By: Vestar Associates IV, L.P., its General Partner; By: Vestar Associates Corporation IV, its General Partner; By: Sander Levy, its Managing Director, /s/ Sander Levy 2012-03-05 Vestar Associates IV, L.P. By: Vestar Associates Corporation IV, its General Partner; By: Sander Levy, its Managing Director, /s/ Sander Levy 2012-03-05 Vestar Associates Corporation IV By: Sander Levy, its Managing Director, /s/ Sander Levy 2012-03-05