FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * SHEFFIELD SCOTT D   2. Issuer Name and Ticker or Trading Symbol PIONEER NATURAL RESOURCES CO [PXD] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) Chairman & CEO (Last) (First) (Middle) 5205 N. O'CONNOR BLVD., SUITE 200 3. Date of Earliest Transaction (Month/Day/Year) 11/07/2012 (Street) IRVING, TX 75039 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock               22,043 (1) I 401(k) Common Stock 11/07/2012   G V 2,000 D $ 0 692,258 D   Common Stock 11/16/2012   G(2) V 40,000 A $ 0 40,000 I by Spouse Common Stock 11/16/2012   G(2) V 40,000 D $ 0 652,258 D   Common Stock 11/27/2012   G(3) V 40,000 A $ 0 40,000 I Family Trust (Officer Trustee) Common Stock 11/27/2012   G(3) V 40,000 D $ 0 0 I by Spouse Common Stock 11/28/2012   G(4) V 40,000 A $ 0 40,000 I Family Trust (Spouse Trustee) Common Stock 11/28/2012   G(4) V 40,000 D $ 0 612,258 D

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
SHEFFIELD SCOTT D 5205 N. O'CONNOR BLVD., SUITE 200 IRVING, TX 75039			Chairman & CEO

Signatures

Mark H. Kleinman, Attorney-in-Fact For Scott D. Sheffield		12/13/2012
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Consists of shares beneficially owned as a result of reporting person's ownership of units in the Pioneer Natural Resources USA, Inc. 401(k) Plan
(2)	The reporting person and his spouse entered into a marital property partition agreement pursuant to which 40,000 shares previously reported as owned directly by the reporting person, and which was community property, became the separate property of his spouse.
(3)	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, but the reporting person has no beneficial interest in the trust.
(4)	Gift by the reporting person to a trust whose beneficiaries are family members of the reporting person and for which the spouse of the reporting person serves as trustee, but the reporting person has no beneficial interest in the trust.

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