X0304 4 2011-11-14 0 0000077877 PETROLEUM DEVELOPMENT CORP PETD 0001416636 Casabona Joseph E. 1775 SHERMAN STREET, SUITE 3000 DENVER CO 80203 1 0 0 0 Common Stock 2011-11-14 4 P 0 1117 32.87 A 17592 D The price reported in Column 4 is a weighted average price. These shares were bought in multiple transactions at prices ranging from $32.8695 to $32.89, inclusive. The reporting person undertakes to provide to PDC Energy, any security holder of PDC Energy, or the staff of the Securities and Exchange Commission upon request, full information regarding the number of shares bought at each separate price within the range set forth in footnote 1 to this Form 4. /s/ Joseph E. Casabona 2011-11-16