Board of Directors

                Pioneer Natural Resources Company
                5205 N. O’Connor Blvd., Suite 200
                Irving, TX 75039

                Directors.pxd.com

                1-888-234-6372 or 972-969-3555

                Campus Recruiting/Internships

                Investor Relations

                Neal Shah, Vice President, Investor Relations at (972) 969-3900, or

                Pioneer Natural Resources Company
                Attn: Investor Relations
                5205 N. O'Connor Blvd., Suite 200
                Irving, TX 75039

                IR@pxd.com

                (972) 969-3583

                For specific items, please request information.

                Media Relations

                (972) 969-5888

                MESA Inc Royalty Trust

                Mesa Royalty Trust is a separate, publicly traded entity.

                For information, contact:
                Mesa Royalty Trust at The Bank of New York Mellon Trust Company, N.A.
                919 Congress Ave., 5th Floor
                Austin, TX 78701

                (512) 236-6599

                Shareholder Administration

                Pioneer has retained an outside transfer agent to maintain records for holders of Pioneer common stock. Communication concerning the transfer or exchange of shares, dividend payments, lost certificates or change of address should be directed to:

                Continental Stock Transfer & Trust Company (CST)
                1 State Street - 30th Floor
                New York, NY 10004-1561

                pioneer@continentalstock.com

                (888) 509-5581

                http://www.continentalstock.com/

                Royalty Owners: Owner Relations

                Pioneer Natural Resources USA, Inc.
                Attn: Division Order Dept.
                P. O. Box 3178
                Midland, TX 79702

                ownerrelationsinquiry@pxd.com

                Main Number: (432) 571-5010
                Option 1:Revenue checks, payment information
                Option 2: Division Orders, Ownership or Change of Ownership, Address Changes, and all other questions

                1099 Hot Line: (432) 571-5260
                WRLP Owner Inquiry Line: (432) 571-5099
                Fax Number: (432) 571-5255

                Royalty Owners: Owner Inquiry

                Pioneer Natural Resources USA, Inc.
                Attn: Division Order Dept.
                P. O. Box 3178
                Midland, TX 79702

                revenueowner.inquiry@pxd.com

                Main Number: (432) 571-5010
                Option 1 Revenue checks, payment information
                Option 2: Division Orders, Ownership or Change of Ownership, Address Changes, and all other questions

                1099 Hot Line: (432) 571-5260
                WRLP Owner Inquiry Line: (432) 571-5099
                Fax Number: (432) 571-5255

                Operations Emergency Numbers

                • Permian: (877) PXD-1997
                • South Texas: (866) 475-6174
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