1 EXHIBIT 4.5 Incorporated Under the Laws of SERIES B CONVERTIBLE PREFERRED The State of Delaware PAR VALUE $.01 NUMBER SHARES This Certificate is transferable in CUSIP 000000 00 0 New York, New York and Jersey City, New Jersey See reverse for certain definitions and legends PIONEER NATURAL RESOURCES COMPANY THIS CERTIFIES THAT IS THE OWNER OF FULLY PAID AND NON-ASSESSABLE SHARES OF THE SERIES B CONVERTIBLE PREFERRED STOCK OF SEAL Pioneer Natural Resources Company (hereinafter called the Corporation), transferable on the books of the Corporation holder hereof in person or by duly authorized attorney upon surrender of this certificate properly endorsed. This certificate is not valid unless countersigned by Transfer Agent and registered by the Registrar. Witness, the seal of the Corporation and the signatures of its duly authorized officers. /s/ S. SHEFHELD PRESIDENT AND CHIEF EXECUTIVE OFFICER DATED COUNTERSIGNED AND REGISTERED: CONTINENTAL STOCK TRANSFER & TRUST COMPANY TRANSFER AGENT AND REGISTRAR /s/ M. WITHROW BY EXECUTIVE VICE PRESIDENT AND SECRETARY Authorized Signature 2 PIONEER NATURAL RESOURCES COMPANY The Corporation is authorized to issue shares of more than one class and to issue shares in more than one series of at least one class. The Corporation will furnish without charge to each stockholder who so requests a statement of the powers, designations, preferences and relative, participating, optional or other special right of each class of stock or series thereof of the Corporation and the qualifications, limitations or restrictions of such preferences and/or rights. Such request may be made to the Corporation or to the transfer agent. The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations: TEN COM - as tenants in common UNIF GIFT MIN ACT - __________Custodian _____________ TEN ENT - as tenants by the entireties (Cust) (Minor) JT TEN - as joint tenants with right of under Uniform Gifts to Minors survivorship and not as tenants Act _______________ in common ([____]) Additional abbreviations may also be used though not in the above list. For value received, ____________________________ hereby sell, assign and transfer unto Please insert Social Security or other Identifying Number of Assignee ----------------------------- - -------------------------------------------------------------------------------- Please print or typewrite name and address of Assignee. - -------------------------------------------------------------------------------- - -------------------------------------------------------------------------------- - -------------------------------------------------------------------------------- shares of - -------------------------------------------------------------------- capital stock represented by the within Certificate, and do hereby irrevocably constitute and appoint _____________________________________________ Attorney to transfer the said stock on the books of the within-named Corporation with full power of substitution in the premises. Dated ---------------------------- X --------------------------------- NOTICE: (Signature) THE SIGNATURES TO THE ASSIGNMENT MUST CORRESPOND WITH THE NAME(S) AS WRITTEN UPON THE FACE OF THE CERTIFICATE IN EVERY PARTICULAR X WITHOUT ALTERNATION OR ENLARGEMENT --------------------------------- OR ANY CHANGE WHATEVER. (Signature) The signature(s) would be guaranteed by an "eligible guarantor institution" as defined in _____ under The Securities Exchange Act of 1934 as amended. SIGNATURE(S) GUARANTEED BY: AMERICAN BANKNOTE COMPANY Production Coordinator - Belinda Beck - [__________] 89 Blair Mill Road Proof of June 10, 1997 Horsham, PA 79044 PIONEER [_________] [_____________] Sales Person M. Garrett Opr. [___] REV. 1 [________________] [__________________]