X0304 4 2011-12-31 0 0000077877 PETROLEUM DEVELOPMENT CORP petd 0001374254 Amidon Daniel Willson 1775 SHERMAN STREET, SUITE 3000 DENVER CO 80203 0 1 0 0 Gen. Counsel & Secretary Common Stock 2011-12-31 4 M 0 3134 35.11 A 35631 D Common Stock 2011-12-31 4 F 0 1288 35.11 D 34343 D Common Stock 2012-01-02 4 F 0 449 35.11 D 33894 D Performance Shares/Rights 35.11 2011-12-31 4 M 0 3134 35.11 A 2013-12-31 Common Stock 3134 1045 D Performance shares/rights earned based upon the average closing price of Petroleum Development Corporation ("Company") stock during December 2011, as disclosed in Form 8-K filed by the Company on March 5, 2009. Participant holds 1,045 remaining performance shares/rights awarded in the same grant as that reported herein awarded on March 4, 2009, as well as performance shares/rights awarded separately on March 7, 2008 and March 12, 2011, in the amounts of 3,698 and 1,791 shares, respectively, all subject to future vesting and those performance criteria set forth in the Form 8-K filings on March 13, 2008 and March 12, 2011, respectively. /s/Daniel Willson Amidon 2012-01-04