As previously disclosed, on October 20, 2020, Parsley Energy, Inc., a Delaware corporation (Parsley), entered into an
Agreement and Plan of Merger (the Merger Agreement), by and among Pioneer Natural Resources Company, a Delaware corporation (Pioneer), Pearl First Merger Sub Inc., a Delaware corporation and a wholly-owned subsidiary of
Pioneer (Merger Sub Inc.), Pearl Second Merger Sub LLC, a Delaware limited liability company and a wholly-owned subsidiary of Pioneer (Merger Sub LLC), Pearl Opco Merger Sub LLC, a Delaware limited liability company and a
wholly-owned subsidiary of Pioneer (Opco Merger Sub LLC), Parsley and Parsley Energy, LLC, a Delaware limited liability company (Opco LLC). The Merger Agreement provides for, among other things, (i) the merger of Merger
Sub Inc. into Parsley (the First Parsley Merger), with Parsley continuing as the surviving corporation (the Surviving Corporation), (ii) simultaneously with the First Parsley Merger, the merger of Opco Merger Sub LLC into
Opco LLC (the Opco Merger), with Opco LLC continuing as the surviving company, and (iii) immediately following the First Parsley Merger and the Opco Merger, the merger of the Surviving Corporation into Merger Sub LLC (together with
the First Parsley Merger and the Opco Merger, the Mergers), with Merger Sub LLC continuing as the surviving entity and a wholly-owned subsidiary of Pioneer. As a result of the Mergers, Parsley will become a wholly owned subsidiary of
Pioneer. On December 4, 2020, Parsley and Pioneer filed with the Securities and Exchange Commission (the SEC) a definitive joint proxy statement/prospectus for the solicitation of proxies in connection with the special meetings of
Parsleys stockholders and Pioneers stockholders, each to be held on January 12, 2021, to vote upon, among other things, matters necessary to complete the Mergers (the Joint Proxy Statement/Prospectus).
Litigation Related to the Mergers
Following the filing of the preliminary joint proxy statement/prospectus on November 23, 2020 (the Preliminary Joint Proxy
Statement/Prospectus), 12 complaints have been filed with respect to the Mergers as of January 5, 2021: three in the United States District Court for the District of Delaware, captioned as Wang v. Parsley Energy, Inc. et al, No. 1:20-cv-01600 (D. Del.) (the Wang Action), Horde v. Parsley Energy, Inc. et al, No.
1:20-cv-1642 (D. Del.) (the Horde Action), and Smith v. Parsley Energy, Inc. et al, No. 1:20-cv-01649 (D. Del.) (the Smith Action); seven in the United States District Court for the Southern District of New York, captioned as Neal v. Parsley Energy, Inc. et al, No. 1:20-cv-10355 (S.D.N.Y.) (the Neal Action), Reyna v. Parsley Energy, Inc. et al, No.
1:20-cv-10453 (S.D.N.Y.) (the Reyna Action), Poole v. Parsley Energy, Inc. et al, No.
1:20-cv-10456 (S.D.N.Y.) (the Poole Action), Hutson v. Parsley Energy, Inc. et al, No.
1:20-cv-105049 (S.D.N.Y.) (the Hutson Action), Bushansky v. Parsley Energy, Inc. et al, No. 1:20-cv-10635 (S.D.N.Y.) (the Bushansky Action), Gebhardt v. Parsley Energy, Inc. et al,
No. 1:20-cv-10793 (S.D.N.Y.) (the Gebhardt Action) and Prinzel v. Parsley Energy, Inc. et al, No. 1:20-cv-10877 (S.D.N.Y.) (the Prinzel Action); one in the United States District Court for the Eastern District of New York, captioned as Ortiz v. Parsley Energy, Inc. et al, No. 1:20-cv-06043 (E.D.N.Y.) (the Ortiz Action, and, together with the Wang Action, the Horde Action, the Smith Action, the Neal Action, the Reyna Action, the Poole
Action, the Hutson Action, the Bushansky Action, the Gebhardt Action, and the Prinzel Action, the Federal Court Actions); and one in the Supreme Court of the State of New York for the County of New York, captioned as Gupta v. Parsley
Energy, Inc. et al, No. 656659/2020 (Sup. Ct. N.Y. Cty) (the Gupta Action and, together with the Federal Court Actions, the Stockholder Actions). The Stockholder Actions were filed by purported Parsley stockholders
and name Parsley and the members of the Parsley board as defendants. The Horde Action, Gupta Action, and Smith Action also name Pioneer, Merger Sub Inc., Merger Sub LLC and Opco Merger Sub LLC as defendants.
The Federal Court Actions allege, among other things, that the Preliminary Joint Proxy Statement/Prospectus fails to disclose certain
allegedly material information in violation of Section 14(a) and Section 20(a) of the Securities Exchange Act of 1934, as amended (the Exchange Act), as well as Rule 14a-9 under the
Exchange Act. The Gupta Action is a putative class action and asserts claims for breach of fiduciary duty against the members of the Parsley board and claims for aiding and abetting breach of fiduciary duty against Parsley, Pioneer and the merger
subsidiaries. The complaint alleges that consideration for the Mergers is inadequate, that certain aspects of the sales process were deficient, that there are conflicts of interest between Parsley insiders and Parsleys public stockholders and
that the Preliminary Joint Proxy Statement/Prospectus omitted material information. The Stockholder Actions seek injunctive relief enjoining the Mergers and damages and costs, among other remedies.
2