X0203 3 2011-03-07 0 0001397821 Duff & Phelps Corp DUF 0001514698 Puzzuoli Patrick Michael C/O DUFF AND PHELPS CORPORATION 55 EAST 52ND STREET NEW YORK NY 10055 0 1 0 0 EVP and CFO Class A common stock 24482 D Non-qualified Stock Option (right to purchase) 16 2017-09-27 Class A common stock 14437 D Duff and Phelps Acquisitions, LLC New Class A Units Class A common stock 1932 D 75% is currently exercisable; the remaining 25% becomes exercisable on September 27, 2011. Pursuant to an exchange agreement, as amended, entered into in connection with the closing of the initial public offering of Duff and Phelps Corporation (the "IPO"), holders of New Class A Units of Duff and Phelps Acquisitions, LLC ("DPA") issued in connection with the reorganization of DPA immediately prior to the consummation of the IPO may exchange their New Class A Units for Class A common stock of Duff and 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. /s/ Edward S. Forman as Attorney-in-Fact for Patrick M. Puzzuoli 2011-03-08