X0306 4 2020-09-13 0 0001038357 PIONEER NATURAL RESOURCES CO PXD 0001238881 BERG MARK STEPHEN 777 HIDDEN RIDGE IRVING TX 75038 0 1 0 0 EVP, Corporate Operations Common Stock 19668 I by Family Trust (Spouse Trustee) Common Stock 2020-09-13 5 G 0 E 39954 0 D 21511 D Common Stock 2020-09-13 5 G 0 E 39954 0 A 39954 I by Spouse Common Stock 2020-09-16 5 G 0 E 39954 0 D 0 I by Spouse Common Stock 2020-09-16 5 G 0 E 39954 0 A 39954 I by Family Trust (Officer Trustee) Common Stock 2020-11-25 4 M 0 5607 98.69 A 27118 D Common Stock 2020-11-25 4 S 0 5607 110.0516 D 21511 D Non-Qualified Stock Option (right to buy) 98.69 2020-11-25 4 M 0 5607 0 D 2014-02-15 2021-02-15 Common Stock 5607 0 D The reporting person and his spouse entered into a marital property partition agreement pursuant to which 39,954 shares previously reported as owned directly by the reporting person, and which was community property, became the separate property of his spouse. Gift by the spouse of the reporting person to a trust whose beneficiaries are family members of the reporting person and for which the reporting person serves as trustee. This transaction was executed in multiple trades at prices ranging from $110 to $110.35. The price reported above reflects the weighted average sale price. The reporting person will provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. Thomas J. Murphy, Attorney-in-Fact For Mark S. Berg 2020-11-30