X0303 4 2010-01-14 1 0000320575 PIONEER DRILLING CO PDC 0001271862 FARES ISSAM M KEIZER KARELWEG 474 1181 RL AMSTELVEEN P7 NETHERLANDS 0 0 1 0 0001072022 PEBBLETON CORP N V PEITERMAAI 15 CURACAO P8 NETHERLANDS ANTILLES 0 0 1 0 Common Stock 2010-01-14 4 S 0 100000 9.56 D 5592108 I See footnote Common Stock 2010-01-15 4 S 0 100000 9.52 D 5492108 I See footnote Common Stock 2010-01-19 4 S 0 200000 9.78 D 5292108 I See footnote The price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $9.50 to $9.66, inclusive. The Reporting Person undertakes to provide to Pioneer Drilling Company, any security holder of Pioneer Drilling Company or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (1), (3) and (4) to this Form 4. By Pebbleton Corporation N.V., a wholly owned subsidiary. The price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $9.50 to $9.62, inclusive. The price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $9.62 to $9.87, inclusive. /s/ Richard E. Blohm, Jr. (attorney-in-fact) 2010-01-19