X0304 4/A 2011-06-07 2011-11-16 false 0001038357 PIONEER NATURAL RESOURCES CO PXD 0001034310 RAMSEY CHARLES E JR 5205 N. O'CONNOR BLVD., SUITE 200 IRVING TX 75039 true false false false Common Stock 2011-06-07 5 G false 1057 0 A 22151 I by Trust Common Stock 2011-06-07 5 G false 1057 0 D 2700 D Common Stock 2011-09-07 5 G false 675 0 A 22826 I by Trust Common Stock 2011-09-07 5 G false 675 0 D 2025 D Common Stock 2011-11-14 4 S false 200 92.36 D 22626 I by Trust Common Stock 2011-11-14 4 S false 700 92.4285 D 21926 I by Trust Common Stock 2011-11-14 4 S false 200 92.46 D 21726 I by Trust Common Stock 2011-11-14 4 S false 100 92.485 D 21626 I by Trust Common Stock 2011-11-14 4 S false 100 92.56 D 21526 I by Trust Common Stock 2011-11-14 4 S false 100 92.33 D 21426 I by Trust Common Stock 2011-11-14 4 S false 700 92.37 D 20726 I by Trust Common Stock 2011-11-14 4 S false 500 92.44 D 20226 I by Trust Common Stock 2011-11-14 4 S false 200 92.47 D 20026 I by Trust Common Stock 2011-11-14 4 S false 900 92.4939 D 19126 I by Trust Common Stock 2011-11-14 4 S false 300 92.5333 D 18826 I by Trust Common Stock 2011-11-14 4 S false 100 92.58 D 18726 I by Trust Common Stock 2011-11-14 4 S false 200 92.34 D 18526 I by Trust Common Stock 2011-11-14 4 S false 400 92.42 D 18126 I by Trust Common Stock 2011-11-14 4 S false 100 92.445 D 18026 I by Trust Common Stock 2011-11-14 4 S false 100 92.48 D 17926 I by Trust Common Stock 2011-11-14 4 S false 100 92.5 D 17826 I by Trust The total number of shares being reported as beneficially owned are being amended to reflect a gift by the reporting person on June 3, 2010 of 4,417 shares to a family trust, which was a change in form of beneficial ownership for purposes of Rule 16a-13. All of these sales were previously reported inadvertently as direct sales by the reporting person, rather than indirect sales by the reporting persons family trust. Transactions between the reporting person and the family trust are considered changes in form of beneficial ownership for purposes of Rule 16a-13. Mark H. Kleinman, Attorney-in-Fact For Charles E. Ramsey, Jr. 2012-02-14