PIONEER NATURAL RESOURCES CO
SC 13D, 2000-02-18
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>   1
================================================================================


                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                           --------------------------


                                  SCHEDULE 13D
                    Under the Securities Exchange Act of 1934



                               PRIZE ENERGY CORP.

                                (Name of Issuer)


                     COMMON STOCK, PAR VALUE $0.01 PER SHARE

                         (Title of Class of Securities)



                                   74267L 10 6

                                 (CUSIP Number)


                                 MARK L. WITHROW
                        PIONEER NATURAL RESOURCES COMPANY
                            1400 WILLIAMS SQUARE WEST
                             5205 N. O'CONNOR BLVD.
                               IRVING, TEXAS 75039


 (Name, Address and Telephone Number of Person Authorized to Receive Notices and
                                 Communications)

                                    Copy to:

                                ROBERT L. KIMBALL
                             VINSON & ELKINS L.L.P.
                            3700 TRAMMELL CROW CENTER
                                2001 ROSS AVENUE
                               DALLAS, TEXAS 75201
                                 (214) 220-7891


                                FEBRUARY 8, 2000

     (Date of Event which Requires Filing of this Statement on Schedule 13D)


================================================================================

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition that is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the following
box. [ ]


<PAGE>   2
CUSIP NO. 74267L106



<TABLE>
- --------------------------------------------------------------------------------------------------------
<S>      <C>                                                                                 <C>
   1     Name of Reporting Person
         I.R.S. Identification No. of above person (entities only)

                  Pioneer Natural Resources USA, Inc.                                          752516853
- --------------------------------------------------------------------------------------------------------
   2     Check the appropriate box if a member of a group                                        (a) [ ]
                                                                                                 (b) [ ]
- --------------------------------------------------------------------------------------------------------
   3     SEC use only
- --------------------------------------------------------------------------------------------------------
   4     Source of Funds                                                                          OO (a)
- --------------------------------------------------------------------------------------------------------
   5     Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e)         [ ]
- --------------------------------------------------------------------------------------------------------
   6     Citizenship or Place of Organization                                                   Delaware
- --------------------------------------------------------------------------------------------------------
                                     7        Sole Voting Power (b) (c)                        3,984,197
                                     -------------------------------------------------------------------
   Number of Shares Beneficially     8        Shared Voting Power                                      0
                                     -------------------------------------------------------------------
      Owned by Each Reporting        9        Sole Dispositive Power (b) (c)                   3,984,197
                                     -------------------------------------------------------------------
            Person With              10       Shared Dispositive Power                                 0
- --------------------------------------------------------------------------------------------------------
  11     Aggregate Amount Beneficially Owned by each Reporting Person (b)                      3,984,197
- --------------------------------------------------------------------------------------------------------
  12     Check if the Aggregate Amount in Row (11) Excludes Certain Shares                           [ ]
- --------------------------------------------------------------------------------------------------------
  13     Percent of Class Represented by Amount in Row (11) (b)                                   27.26%
- --------------------------------------------------------------------------------------------------------
  14     Type of Reporting Person                                                                     CO
- --------------------------------------------------------------------------------------------------------
</TABLE>

(a)  See Item 3.

(b)  Assuming conversion of all Series A 6% Convertible Preferred Stock of the
     Issuer into shares of Common Stock of the Issuer.

(c)  The Shares beneficially owned by the Reporting Person are subject to the
     terms and conditions of the Voting and Shareholders Agreement described in
     Item 6 below.



<PAGE>   3
CUSIP NO. 74267L106

<TABLE>
<S>      <C>                                                                                 <C>
- --------------------------------------------------------------------------------------------------------
   1     Name of Reporting Person
         I.R.S. Identification No. of above person (entities only)

                 Pioneer Natural Resources Company                                            752702753
- --------------------------------------------------------------------------------------------------------
   2     Check the appropriate box if a member of a group                                       (a) [ ]
                                                                                                (b) [ ]
- --------------------------------------------------------------------------------------------------------
   3     SEC use only
- --------------------------------------------------------------------------------------------------------
   4     Source of Funds                                                                         OO (a)
- --------------------------------------------------------------------------------------------------------
   5     Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e)        [ ]
- --------------------------------------------------------------------------------------------------------
   6     Citizenship or Place of Organization                                                  Delaware
- --------------------------------------------------------------------------------------------------------
                                     7        Sole Voting Power (b) (c)                       3,984,197
                                     -------------------------------------------------------------------
   Number of Shares Beneficially     8        Shared Voting Power                                     0
                                     -------------------------------------------------------------------
      Owned by Each Reporting        9        Sole Dispositive Power (b) (c)                  3,984,197
                                     -------------------------------------------------------------------
            Person With              10       Shared Dispositive Power                                0
- --------------------------------------------------------------------------------------------------------
  11     Aggregate Amount Beneficially Owned by each Reporting Person (b)                     3,984,197
- --------------------------------------------------------------------------------------------------------
  12     Check if the Aggregate Amount in Row (11) Excludes Certain Shares                          [ ]
- --------------------------------------------------------------------------------------------------------
  13     Percent of Class Represented by Amount in Row (11) (b)                                  27.26%
- --------------------------------------------------------------------------------------------------------
  14     Type of Reporting Person                                                                    CO
- --------------------------------------------------------------------------------------------------------
</TABLE>

(a)  See Item 3.

(b)  Assuming conversion of all Series A 6% Convertible Preferred Stock of the
     Issuer into shares of Common Stock of the Issuer.

(c)  The Shares beneficially owned by the Reporting Person are subject to the
     terms and conditions of the Voting and Shareholders Agreement described in
     Item 6 below.


<PAGE>   4

The information contained in this Schedule 13D is as of the date hereof, unless
otherwise expressly provided herein.

ITEM 1.  SECURITY AND ISSUER.

         The class of equity securities to which this Schedule 13D (this
"Statement") relates is the common stock, par value $0.01 per share (the "Common
Stock") of Prize Energy Corp., a Delaware corporation (the "Issuer"). The
address of the Issuer's principal executive offices is 3500 William D. Tate,
Suite 200, Grapevine, Texas 76051.

ITEM 2.  IDENTITY AND BACKGROUND.

         (a), (b), (c) and (f). This Statement is being filed by Pioneer Natural
Resources Company, a Delaware corporation ("Parent"), and by Pioneer Natural
Resources USA, Inc., a Delaware corporation and wholly-owned subsidiary of
Parent ("Pioneer USA"). Parent and Pioneer USA are collectively referred to
herein as the "Reporting Persons." The principal business and office address of
each Reporting Person is 1400 Williams Square West, 5205 N. O'Connor Blvd.,
Irving, Texas 75039. Parent is a publicly-traded, independent exploration and
production oil and gas company that owns and operates its United States assets
through Pioneer USA.

         The executive officers of the Reporting Persons are Scott D. Sheffield,
Timothy L. Dove, Dennis E. Fagerstone, Danny Kellum, and Mark L. Withrow. Each
such executive officer is a United States citizen whose business address is 1400
Williams Square West, 5205 N. O'Connor Boulevard, Irving, Texas 75039. Mr.
Sheffield is the President, Chief Executive Officer, Assistant Secretary and a
Director of Parent , and President of Pioneer USA. Mr. Dove is Executive Vice
President and Chief Financial Officer of both Parent and Pioneer USA, and a
Director of Pioneer USA. Mr. Fagerstone is Executive Vice President of both
Parent and Pioneer USA, and a Director of Pioneer USA. Mr. Kellum is the Vice
President-Domestic Operations of both Pioneer and Pioneer USA, and a Director of
Pioneer USA. Mr. Withrow is Executive Vice President, General Counsel and
Secretary of both Parent and Pioneer USA, and a Director of Pioneer USA.

         The Directors of Parent are James R. Baroffio, R. Hartwell Gardner,
James L. Houghton, Jerry P. Jones, Richard E. Rainwater, Charles E. Ramsey, Jr.,
Scott D. Sheffield (who is also the Chairman of the Board) and Robert L.
Stillwell. Each such Director is a United States citizen. Mr. Baroffio is
retired and his business address is 1400 Williams Square West, 5205 N. O'Connor
Blvd., Irving, Texas 75039. Mr. Gardner is retired and his business address is
1400 Williams Square West, 5205 N. O'Connor Blvd., Irving, Texas 75039. Mr.
Houghton is retired and his business address is 1400 Williams Square West, 5205
N. O'Connor Blvd., Irving, Texas 75039. Mr. Jones is Of Counsel to the law firm
of Thompson & Knight, P.C. and his business address is 1400 Williams Square
West, 5205 N. O'Connor Blvd., Irving, Texas 75039. Mr. Rainwater is an
independent investor and the sole shareholder and Chairman of Rainwater, Inc.
(an investment company), and his business address is 1400 Williams Square West,
5205 N. O'Connor Blvd., Irving, Texas 75039. Mr. Ramsey is an independent
management and financial consultant and his business address is 1400 Williams
Square West, 5205 N. O'Connor Blvd., Irving, Texas 75039. Mr. Stillwell is a
partner in the law firm of Baker & Botts, L.L.P. and his business address is
1400 Williams Square West, 5205 N. O'Connor Blvd., Irving, Texas 75039.

         (d) and (e). Neither Reporting Person, nor any of the respective
executive officers and directors of Reporting Persons, has, during the last five
years, been (i) convicted in a criminal proceeding (excluding traffic violations
or similar misdemeanors) or (ii) party to a civil proceeding of a judicial or
administrative body of competent jurisdiction and as a result of which such
person was or is subject to a judgment, decree or final order enjoining future
violations of, or prohibiting or mandating activities subject to, federal or
state securities laws or finding any violation with respect to such laws.

ITEM 3.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

         Pursuant to the terms of a Purchase and Sale Agreement dated May 16,
1999 and effective as of July 1, 1999, Pioneer USA sold the interests in certain
of its oil and gas producing properties, primarily located in Texas, Louisiana
and Oklahoma to Prize Energy Corp., a Delaware corporation ("Old Prize"), for a
total consideration of $242 million, including transaction costs, payable in
cash and 2,377.443 shares of Series A 6% Convertible Preferred Stock of Old
Prize.

         Pursuant to the terms of an Agreement and Plan of Merger dated October
8, 1999, a wholly owned subsidiary of Vista Energy Resources, a Delaware
corporation, was merged with and into Old Prize, on February 8, 2000. In


<PAGE>   5




connection with the merger, Vista Energy Resources, Inc. was renamed Prize
Energy Corp ("New Prize" or "Issuer"). Pursuant to the terms of the merger, each
share of Series A 6% Convertible Preferred Stock of Old Prize was converted into
1,665.187 shares of New Prize Series A 6% Convertible Preferred Stock.
Therefore, Pioneer USA is now the owner of 3,984,197 shares of Series A 6%
Convertible Preferred Stock of New Prize (the "Shares"), which are currently
convertible into shares of Common Stock on a one-for-one basis, and to which
this Statement relates.

ITEM 4.  PURPOSE OF THE TRANSACTION.

         Pioneer USA acquired the Shares as partial consideration for the sale
of certain of its oil and gas producing properties to Old Prize. (See Item 3.)

         Except as set forth in this Item 4 and Item 6, neither Reporting Person
has any present plans or proposals that relate to or that would result in any of
the actions specified in clauses (a) through (j) of Item 4 of Schedule 13D of
the Exchange Act.

ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER.

         (a) and (b). Assuming conversion of all Series A 6% Convertible
Preferred Stock of Issuer, each Reporting Person is the beneficial owner of
3,984,197 shares of Common Stock, or 27.26% of the outstanding shares of Common
Stock of Issuer. Subject to the terms of the Voting and Shareholders Agreement
described in Item 6, each Reporting Person has the sole power to vote and
dispose of the shares.

         (c) and (d). Neither Reporting Person, nor any of the respective
executive officers or directors of the Reporting Persons, effected any
transactions in the Common Stock during the past 60 days, and no person is known
to have the right to receive or the power to direct the receipt of dividends
from, or the proceeds from the sales, of, the shares.

         (e) Not applicable.

ITEM 6.  CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT
         TO THE SECURITIES OF THE ISSUER.

         Voting and Shareholders Agreement.

         Pursuant to the Voting and Shareholders Agreement (the "Voting and
Shareholders Agreement") dated February 8, 2000 between the Issuer and holders
of the Issuer's Common Stock and Shares, including Pioneer USA, the parties to
the agreement will have the following rights to nominate and elect directors to
the Issuer's board:

         o        Stockholders who are members of Issuer's management may
                  designate one member;

         o        Natural Gas Partners V, L.P. may designate three members; and

         o        Pioneer USA may designate two members.

         The parties to the Voting and Shareholders Agreement are obligated to
vote their respective shares of Common Stock and Shares as may be necessary to
implement the above board representation.

         However, on the date on which Pioneer USA no longer owns at least 60%
of the Shares initially issued to it in the merger, or the equivalent number of
shares of Issuer's Common Stock obtained upon conversion, Pioneer USA shall have
the right to nominate and elect one director to the Issuer's board and Natural
Gas Partners V, L.P. shall have the right to nominate and elect four directors
to the Issuer's board.

         The provisions of the Voting and Shareholders Agreement described above
regarding election of directors terminates as to:

         o        any single Issuer management member on the first to occur of
                  the termination of that person's employment by Issuer, the
                  death of that person and the date on which that person
                  transfers Issuer securities in violation of the transfer
                  restrictions provided for in the agreement;

         o        Pioneer USA on the date on which Pioneer USA no longer owns
                  shares of Issuer's Common Stock and shares of Issuer's
                  convertible preferred stock, which are convertible into shares
                  of Issuer's Common


<PAGE>   6
                  Stock, that constitute, on an as converted basis, at least
                  16.7% of the Issuer's Common Stock outstanding; and

         o        all parties to the agreement on June 29, 2009.

         The Voting and Shareholders Agreement also contains certain
restrictions on the transferability of the Shares.

ITEM 7.  MATERIAL TO BE FILED AS EXHIBITS.

Exhibit 10.1:     Voting and Shareholders Agreement dated as of February 8, 2000
                  between Prize Energy Corp. and its stockholders.*

Exhibit 99.1:     Joint Filing Statement dated February 18, 2000 among Reporting
                  Persons.*


- ----------
*Filed herewith.


<PAGE>   7

                                   SIGNATURES

         After reasonable inquiry and to the best of my knowledge and belief,
the undersigned certifies that the information set forth in this statement is
true, complete and correct.


Dated:   February 18, 2000                PIONEER NATURAL RESOURCES COMPANY



                                          By: /s/  MARK L. WITHROW
                                             -------------------------------
                                          Name: Mark L. Withrow
                                          Title: Executive Vice President


Dated:   February 18, 2000                PIONEER NATURAL RESOURCES USA, INC.



                                          By: /s/  MARK L. WITHROW
                                             -------------------------------
                                          Name: Mark L. Withrow
                                          Title: Executive Vice President




<PAGE>   8
                                  EXHIBIT INDEX


<TABLE>
<CAPTION>
Exhibit
   No.        Description
- -------       -----------
<S>           <C>
10.1          Voting and Shareholders Agreement dated as of February 8, 2000
              between Prize Energy Corp. and its stockholders.*

99.1          Joint Filing Statement dated February 18, 2000 among the Reporting
              Persons.*
</TABLE>



- ----------
*Filed herewith.




<PAGE>   1

                                                                    EXHIBIT 10.1

                        VOTING AND SHAREHOLDERS AGREEMENT


         This VOTING AND SHAREHOLDERS AGREEMENT (this "AGREEMENT"), is made and
entered into as of the 8th day of February, 2000, by and among Prize Energy
Corp. (formerly known as Vista Energy Resources, Inc.), a Delaware corporation
(the "COMPANY"); Prize Natural Resources, Inc. (formerly known as Prize Energy
Corp.), a Delaware corporation ("OLD PRIZE"); the individuals and trusts listed
as Management Owners on the execution pages hereof (the "MANAGEMENT OWNERS");
the individuals listed as Employee Owners on the execution pages hereof
(including any additional persons who are employed by the Company and
subsequently become parties to this Agreement, the "EMPLOYEE OWNERS"); the
individuals and trusts listed as Other Owners on the execution pages hereof (the
"OTHER OWNERS"); Natural Gas Partners II, L.P., a Delaware limited partnership
("NGP II"), Natural Gas Partners III, L.P., a Delaware limited partnership ("NGP
III"), and Natural Gas Partners V, L.P., a Delaware limited partnership ("NGP V"
and, together with NGP II and NGP III, "NGP"); and Pioneer Natural Resources
USA, Inc., a Delaware corporation ("PIONEER").

                              W I T N E S S E T H:

         WHEREAS, Old Prize and certain of the Owners (as defined in Section 3
of this Agreement) entered into an Amended and Restated Voting and Shareholders
Agreement dated as of June 29, 1999 (the "PRIZE AGREEMENT"); and

         WHEREAS, Old Prize, the Company and a newly-formed wholly-owned
subsidiary of the Company ("MERGER SUB") entered into an Agreement and Plan of
Merger dated as of October 8, 1999 (the "MERGER AGREEMENT"), under which, on the
date hereof, Merger Sub was merged with and into Old Prize and Old Prize became
a wholly-owned subsidiary of the Company; and

         WHEREAS, under the terms of the Merger Agreement, upon consummation of
the Merger, the Prize Agreement is to be terminated and the parties hereto are
to enter into this Agreement; and

         WHEREAS, certain terms are defined in Section 3 of this Agreement;

         NOW, THEREFORE, in consideration of the premises and the mutual terms,
covenants and conditions contained herein, the parties hereto agree as follows:

         Section 1. Voting Agreement.

         (a) General Rights. From and after the date hereof and until the
provisions of this Section 1 shall terminate as provided in Section 1(b) below,
the Owners, NGP II and NGP III agree to vote all of their Owner Shares and any
other voting securities of the Company over which they have voting control, and
the Company will take all reasonable actions within its control, that may be
necessary in order to cause:

             (i) the nomination and election to the Board of one representative
         designated by a majority in interest of the Management Owners;

             (ii) the nomination and election to the Board of (A) three
         representatives designated by NGP before the Pioneer Board Reduction
         Event, and (B) four representatives designated by NGP on and after the
         Pioneer Board Reduction Event;

             (iii) the nomination and election to the Board of (A) two
         representatives designated by Pioneer before the Pioneer Board
         Reduction Event, and (B) one representative designated by Pioneer on
         and after the Pioneer Board Reduction Event;

             (iv) the removal from the Board (with or without cause) of any or
         all of the representatives designated by the Management Owners
         hereunder at the written request of a majority in interest of the
         Management Owners (but only upon such written request an under no other
         circumstances);


<PAGE>   2

             (v) the removal from the Board (with or without cause) of any or
         all of the representatives designated by NGP hereunder at the written
         request of NG (but only upon such written request and under no other
         circumstances);

             (vi) the removal from the Board (with or without cause) of any or
         all of the representatives designated by Pioneer hereunder at the
         written request o Pioneer (but only upon such written request and under
         no other circumstances);

             (vii) in the event that any representative designated by the
         Management Owners hereunder for any reason ceases to serve as a member
         of the Board during his term of office, the resulting vacancy on the
         Board to be filled by a representative designated by a majority in
         interest of the Management Owners;

             (viii) in the event that any representative designated by NGP
         hereunder for any reason ceases to serve as a member of the Board
         during his term of office the resulting vacancy on the Board to be
         filled by a representative designated by an authorized representative
         of NGP;

             (ix) in the event that any representative designated by Pioneer
         hereunder for any reason ceases to serve as a member of the Board
         during his term of office, the resulting vacancy on the Board to be
         filled by a representative designated by an authorized representative
         of Pioneer; and

             (x) the provisions of Section 3 of Article Four of the Amended and
         Restated Bylaws (together with related definitions) to be preserved and
         effective without amendment, elimination, or superseding (whether
         directly, by charter amendment, or otherwise) from the form attached as
         Exhibit A hereto unless Pioneer previously consents in writing to such
         amendment elimination, or superseding.

         (b) Termination.

             (i) The provisions of this Section 1 shall terminate with respect
         to any single Management Owner on the first to occur of the following:

                 (A) the date such Management Owner's employment by the Company
             shall have terminated;

                 (B) the date of the death of such Management Owner; or

                 (C) the date of any Transfer or purported Transfer of Owner
             Shares by such Management Owner in violation of the terms of this
             Agreement.

             (ii) The provisions of this Section 1 shall terminate as to Pioneer
         on the first date on which Pioneer no longer owns shares of Common
         Stock and Underlying Common Stock that constitute at least 14.03% of
         the total issued and outstanding shares of Common Stock (Underlying
         Common Stock shall be deemed issued and outstanding for the purpose of
         such computation) (whether such reduction of percentage ownership
         occurs as a result of Pioneer's sale or transfer of such shares, the
         Company's issuance of additional shares or the merger, consolidation or
         other transaction involving the Company, or otherwise). Upon the
         reduction of Pioneer's percentage ownership below 14.03%, as described
         in the preceding sentence, the provisions of this Section 1 shall also
         terminate as to all other Owners, NGP II and NGP III.

             (iii) The provisions of this Section 1 shall terminate as to all
         Owners, NGP II and NGP III on June 29, 2009, unless extended by the
         parties hereto.

         Section 2. Transfer Restrictions.

         (a) General Rights. In addition to any restrictions on the Transfer of
Owner Shares that are imposed under the Securities Act or other applicable
securities laws, no Restricted Owner shall Transfer or Pledge all or any part of
such Restricted Owner's Owner Shares without the prior written consent of the
other Restricted Owners or in accordance with this Section 2.



<PAGE>   3
         (b) Pro-Rata Sale Rights after an IPO. No Restricted Owner shall have
the right to effect any Transfer of any of such Restricted Owner's Owner Shares
(other than as provided in Section 2(c) below) unless such Restricted Owner
proposing to Transfer such Owner Shares (a "SELLING OWNER") complies with the
tag-along requirements of clause (i) or (ii) below:

             (i) Public Sales Through a Broker. If a proposed Transfer is to be
         effectuated through an established brokerage firm and utilizing the
         public securities markets (e.g., the New York Stock Exchange, the
         American Stock Exchange or The Nasdaq Stock Market):

                 (A) Such Selling Owner shall provide prior written notice of
             the following (a "PUBLIC SALE NOTICE") to all other Restricted
             Owners ("TAG-ALONG OWNER(S)"): (I) the number of shares proposed to
             be made available for sale (the "INITIAL SHARES"); (II) the pricing
             and other instructions pursuant to which the selected broker will
             be operating; (III) the name, address, telephone number and
             facsimile number of the selected broker and the name of the
             selected registered representative at the broker; and (IV)
             confirmation that the selected broker and selected registered
             representative have been advised that the Tag-Along Owners may
             desire to elect to participate in the proposed Transfer.

                 (B) After receiving a Public Sale Notice, a Tag-Along Owner
             shall be entitled to elect to participate, up to such Tag-Along
             Owner's Proportionate Share, in the proposed Transfer through the
             selected broker, subject to such Tag-Along Owner's (I) meeting all
             of the broker's requirements to establish a customer account and
             execute transactions for such Tag-Along Owner, (II) meeting all of
             the requirements imposed by applicable securities laws in order to
             execute such transaction (including without limitation Rule 144
             under the Securities Act), and (III) responding in writing within
             three business days after receipt of such Public Sale Notice to
             such Selling Owner, to the Tag-Along Owners and to the selected
             broker. If the designated broker is unable to sell an amount at
             least equal to the number of Initial Shares, the aggregate number
             of shares which the designated broker is able to sell shall be
             allocated on a Proportionate Share basis among such Selling Owner
             and all Tag-Along Owners electing to participate in the proposed
             Transfer.

             (ii) Non-Broker Transactions. In the case of a proposed Transfer
         that does not fall within the provisions of clause (i) of this Section
         2(b), such Selling Owner shall cause the Person or group that proposes
         to acquire Owner Shares from such Selling Owner (the "PROPOSED
         PURCHASER") to offer in writing (the "PURCHASE OFFER") to the Tag-Along
         Owners, to purchase a Proportionate Share of the Owner Shares of the
         Tag-Along Owners. Any such purchase shall be made in accordance with
         the following:

                 (A) the purchase from each Tag-Along Owner shall be made at the
             highest price per share and on such other terms and conditions as
             the Proposed Purchaser has offered to purchase Owner Shares from
             such Selling Owner;

                 (B) each Tag-Along Owner shall have no more than 20 days from
             the receipt of the Purchase Offer in which to accept such Purchase
             Offer, in whole or in part;

                 (C) to the extent that a Tag-Along Owner accepts such Purchase
             Offer, the number of Owner Shares to be sold to the Proposed
             Purchaser by such Selling Owner shall be proportionately reduced to
             the extent necessary to comply with this Section 2(b)(ii); and

                 (D) the closing of such purchase shall occur within 30 days
             after such acceptance or at such other time as such Selling Owner,
             the Tag-Along Owners and the Proposed Purchaser may agree.

         (c) Excluded Transfers. The provisions of Section 2(b) above do not
apply to any Transfer by a Restricted Owner of such Restricted Owner's Owner
Shares in an Excluded Affiliate Transfer. The provisions of Section 2(b) above
do not apply to any Transfer by a Restricted Owner of such Restricted Owner's
Owner Shares pursuant to (i) a registration statement filed under the Securities
Act, or (ii) a sale effected through a national securities exchange or the
Nasdaq Stock Market.



<PAGE>   4




         (d) Termination. This Section 2 shall terminate upon the earlier to
occur of the following: (i) the first date on which the Restricted Owners
collectively do not own at least 20% of the outstanding common equity securities
of the Company or of any successor or assignee resulting from the consolidation,
merger or sale of all or substantially all of the assets of the Company; (ii)
the adjudication of the Company as a bankrupt, the execution by the Company of
an assignment for the benefit of creditors or the appointment of a receiver of
the Company; (iii) the voluntary or involuntary dissolution of the Company; (iv)
when there is otherwise only one surviving Restricted Owner as a party to this
Agreement; (v) June 29, 2009, unless extended by agreement of Restricted Owners
holding at least 80% of the Owner Shares held by Restricted Owners outstanding
on such date; or (vi) the written agreement of all the Restricted Owners. The
Company and the Restricted Owners each covenant and agree to enter into and to
use their best efforts to cause any successor or assignee of the Company
described in clause (i) of this Section 2(d) to enter into an agreement
substantially similar to this Agreement if the Restricted Owners collectively
own at least 20% of the equity interests in such successor or assignee.

         Section 3. Definitions. As used in this Agreement, the following terms
shall have the meanings assigned to them in this Section 3:

         "AGREEMENT" means this Voting and Shareholders Agreement, as the same
may be amended from time to time.

         "BOARD" means the Board of Directors of the Company.

         "COMMON STOCK" means the Company's common stock, par value $.01 per
share

         "COMPANY" has the meaning set forth in the introductory paragraph of
this Agreement.

         "EMPLOYEE OWNERS" has the meaning set forth in the introductory
paragraph of this Agreement.

         "EXCLUDED AFFILIATE TRANSFER" means (i) any transfer of Owner Shares by
a Restricted Owner, other than a Management Owner or an Employee Owner (whether
voluntarily or by operation of law) to a partner or other affiliate or a legal
successor of such Restricted Owner; (ii) any transfer of Owner Shares by a
Restricted Owner who is an individual to a member of such Restricted Owner's
family or to a revocable trust for estate planning purposes, but only if such
Restricted Owner retains the right to vote such Owner Shares following such
transfer; (iii) any transfer upon the death of a Restricted Owner who is an
individual; and (iv) any transfer of Owner Shares by a Restricted Owner which is
a trust to the principal beneficiary of that trust; provided that, in the case
of any Transfer described in clause (i), (ii), (iii) or (iv) above, such
transferee agrees to be bound by the terms of this Agreement and evidences same
by executing a copy of this Agreement promptly upon receiving the assignment of
such Owner Shares.

         "INITIAL SHARES" has the meaning set forth in Section 2(b)(i)(A)
hereof.

         "MANAGEMENT OWNERS" has the meaning set forth in the introductory
paragraph of this Agreement.

         "MERGER AGREEMENT" has the meaning set forth in the recitals to this
Agreement.

         "MERGER SUB" has the meaning set forth in the recitals to this
Agreement.

         "NGP," "NGP II," "NGP III" and "NGP V" have the meanings set forth in
the introductory paragraph of this Agreement.

         "OLD PRIZE" has the meaning set forth in the introductory paragraph of
this Agreement.

         "OTHER OWNERS" has the meaning set forth in the introductory paragraph
of this Agreement.

         "OWNER(S)" means the Management Owners, the Employee Owners, the Other
Owners, NGP V and Pioneer.

         "OWNER SHARES" means, with respect to any Owner, NGP II or NGP III: (i)
a shares of Common Stock or Series A Preferred currently held or held in the
future by such Person (including, without limitation, shares acquired upon the
exercise of any option, warrant or other right); provided that, in order to
participate in any Purchase Offer, such conversion must occur no later than the
deadline for acceptance of such offer as set forth in Section 2(b)(ii)(B)
hereof;


<PAGE>   5
(ii) any equity securities issued or issuable directly or indirectly to such
Person with respect to the Common Stock or Series A Preferred referred to in
clause (i) above by way of stock dividend or stock split or in connection with a
combination of shares, conversion, recapitalization, merger, consolidation or
other reorganization; and (iii) any other shares of any class or series of
voting security of the Company currently held or held in the future by such
Person. As to any particular shares constituting Owner Shares, such shares will
cease to be Owner Shares when they have been transferred to any person who is
not a current or future party to this Agreement, other than pursuant to an
Excluded Affiliate Transfer. In determining the percentage ownership of any
Person or Persons or their participation in a transaction, the Series A
Preferred shall be counted on an as-converted basis with the Common Stock.

         "PERMITTED ASSIGN" means an assignee of Owner Shares who acquires such
shares in an Excluded Affiliate Transfer.

         "PERSON" means any individual, corporation, partnership, limited
liability company, trust, unincorporated association, business, or other legal
entity, and any governmental agency or political subdivision thereof.

         "PIONEER" has the meaning set forth in the introductory paragraph of
this Agreement.

         "PIONEER BOARD REDUCTION EVENT" means the first date on which Pioneer
no longer owns Common Stock and Underlying Common Stock that constitutes at
least 25.2% of the total issued and outstanding shares of Common Stock (whether
as a result of Pioneer's sale or transfer of such shares, the Company's issuance
of additional shares, a merger, consolidation or other fundamental change
involving the Company, or otherwise).

         "PLEDGE" means any pledge of an interest in, or other encumbrance
placed upon, Owner Shares as security for indebtedness or for other purposes.

         "PRIZE AGREEMENT" has the meaning set forth in the recitals to this
Agreement.

         "PROPORTIONATE SHARE" means:

             (i) for purposes of Section 2(b)(i) hereof, the number of Owner
         Shares equal to the product of (A) the Initial Shares, or such lesser
         number of shares that the designated broker has been able to sell
         pursuant Section 2(b)(i) hereof, times (B) the fraction which is equal
         to the total number of Owner Shares which a Tag-Along Owner electing to
         participate in a Transfer owns, over the aggregate number of Owner
         Shares owned by the Selling Owner and all Tag-Along Owners electing to
         participate in a Transfer; and

             (ii) for purposes of Section 2(b)(ii) hereof, the number of Owner
         Shares equal to the product of (A) the total number of Owner Shares
         which a Proposed Purchaser has offered to purchase from the Selling
         Owner, times (B) the fraction which is equal to the total number of
         Owner Shares which a Tag-Along Owner owns, over the aggregate number of
         Owner Shares owned by the Selling Owner and all Tag-Along Owners who
         have elected participate in a Transfer.

         "PROPOSED PURCHASER" has the meaning set forth in Section 2(b)(ii)
hereof.

         "PUBLIC SALE NOTICE" has the meaning set forth in Section 2(b)(i)(A)
hereof.

         "PURCHASE OFFER" has the meaning set forth in Section 2(b)(ii) hereof.

         "RESTRICTED OWNER(S)" means the Management Owners, the Employee Owners
an NGP V and their successors and assigns.

         "SECURITIES ACT" means the Securities Act of 1933, as amended.

         "SELLING OWNER" has the meaning set forth in Section 2(b) hereof.

         "SERIES A PREFERRED" means the Company's Series A 6% convertible
preferred stock, par value $.01 per share.

         "TAG-ALONG OWNER(S)" has the meaning set forth in Section 2(b)(i)(A)
hereof.


<PAGE>   6
         "TRANSFER" means any sale, assignment or other disposition of Owner
Shares, other than a Pledge.

         "UNDERLYING COMMON STOCK" means at any time, with respect to any share
of Series A Preferred, the aggregate number of shares of Common Stock into which
such share is then convertible.

         Section 4. Enforcement; Legends. No Owner Shares shall be transferred
on the books of the Company, nor shall any Transfer be effective, unless and
until the terms and provisions of this Agreement are first complied with and, in
case of violation of this Agreement by the attempted Transfer of Owner Shares
without compliance with the terms and provisions hereof, such Transfer shall be
invalid and of no effect. The Owners will cause the Company to imprint a legend
on any certificates evidencing Owner Shares which are subject to this Agreement
referring to the voting rights and the restrictions on Transfer of the Owner
Shares imposed hereunder. Any such legend shall be removed from the certificates
evidencing any shares which cease to be Owner Shares, as set forth in the
definition of such term in Section 3 hereof.

         Section 5. Termination. This Agreement shall terminate upon the
termination of Section 1 and Section 2 hereof.

         Section 6. Miscellaneous.

         (a) Benefit. This Agreement will only bind and inure to the benefit
of, and will only be enforceable by and against, the original parties
hereto and any Permitted Assigns under this Agreement.

         (b) Notices. Whenever in this Agreement, notice is required as
permitted to be given it shall be given in writing, and if such notice is given
by registered United States mail it shall be deemed to have been received on the
second business day after the date such notice is posted. All notices hereunder
to the Company shall be mailed to it at the address of its principal place of
business and all notices to the Owners shall be mailed to them at their last
known address as shown on the books and records of the Company. Any party may
change such party's mailing address by giving written notice of such change to
all other parties.

         (c) GOVERNING LAW. THIS AGREEMENT AND THE RIGHTS AND DUTIES OF THE
PARTIES HEREUNDER SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS
OF THE STATE OF DELAWARE.

         (d) Number. Words in the singular shall be construed to include the
plural and vice versa, unless the context otherwise requires.

         (e) Headings. The headings appearing in this Agreement are inserted
only for convenience of reference and in no way shall be construed to define,
limit or describe the scope or intent of any provision of this Agreement.

         (f) Severability. Every provision in this Agreement is intended to be
severable. In the event that any provision in this Agreement shall be held
invalid, the same shall not affect in any respect whatsoever the validity of the
remaining provisions of this Agreement; provided, however, that if any such
provision may be made enforceable by limitation thereof, then such provision
shall be deemed to be so limited and shall be enforceable to the maximum extent
permitted by applicable law.

         (g) Joinder. The spouse, if any, of each Management Owner and Employee
Owner who resides in a state subject to community property laws joins in the
execution and delivery of this Agreement for the express purpose of binding his
or her community property interests, if any, in the Owner Shares.

         (h) Counterparts. This Agreement may be executed in one or more
counterparts, each of which shall be deemed an original and all of which shall
constitute but one and the same instrument.

         (i) Entirety and Modification. This Agreement constitutes the entire
agreement of the parties hereto with respect to the subject matter hereof and
supercedes all prior understandings and agreements regarding such matters,
including without limitation the Prize Agreement, which is hereby terminated.
This Agreement may not be modified, supplemented or amended in any respect
except by written instrument executed by all parties hereto.



<PAGE>   7




         IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the date and year first above written.

Prize Energy Corp.                           Prize Natural Resources, Inc.
(formerly known as                           (formerly known as
Vista Energy Resources, Inc.)                Prize Energy Corp.)


By: /s/ Philip B. Smith                      By: /s/ Lon C. Kile
    ------------------------------               -------------------------------
    Philip B. Smith, Chairman and                Lon C. Kile
    Chief Executive Officer                      President


<PAGE>   8




                                MANAGEMENT OWNERS

Initial Number of
Owner Shares:
356,257 shares of                /s/ Philip B. Smith
Common Stock                     -----------------------------------------------
                                 Philip B. Smith, Trustee of The Philip B. Smith
                                 Revocable Trust Dated July 25, 1994

Initial Number of
Owner Shares:
84,134 shares of                 /s/ Philip B. Smith
Common Stock                     -----------------------------------------------
                                 Philip B. Smith, Trustee of The Scott C. Smith
                                 Irrevocable Trust Dated January 15, 1996

Initial Number of
Owner Shares:
84,134 shares of                 /s/ Philip B. Smith
Common Stock                     -----------------------------------------------
                                 Philip B. Smith, Trustee of The Laura E. Smith
                                 Irrevocable Trust Dated January 15, 1996

Initial Number of
Owner Shares:
41,630 shares of                 /s/ Lon C. Kile
Common Stock                     -----------------------------------------------
                                 Lon C. Kile

                                       NGP

                                 NATURAL GAS PARTNERS II, L.P.

                                 By: G.F.W. Energy II, L.P., General Partner
                                 By: GFW II, L.L.C., General Partner

Initial Number of
Owner Shares:
511,709 shares of                By: /s/ Kenneth A. Hersh
Common Stock                        --------------------------------------------
                                    Kenneth A. Hersh, Authorized Member


                                 NATURAL GAS PARTNERS III, L.P.

                                 By: Rainwater Energy Investors, L.P.
                                     General Partner
                                 By: GFW III, L.L.C., General Partner
Initial Number of
Owner Shares:
699,390 shares of                By: /s/ Kenneth A. Hersh
Common Stock                         -------------------------------------------
                                     Kenneth A. Hersh, Authorized Member


<PAGE>   9




                                 NATURAL GAS PARTNERS V, L.P.

                                 By: G.F.W. Energy V, L.P., General Partner
                                 By: GFW V, L.L.C., General Partner
Initial Number of
Owner Shares:
7,326,821 shares of              By: /s/ Kenneth A. Hersh
Common Stock                         -------------------------------------------
                                     Kenneth A. Hersh, Authorized Member


                                     PIONEER

                                 PIONEER NATURAL RESOURCES USA, INC.


Initial Number of
Owner Shares:                    By: /s/ Mark L. Withrow
3,984,197 shares of                  -------------------------------------------
Series A Preferred                   Mark L. Withrow
                                     Executive Vice President


                                 EMPLOYEE OWNERS


Initial Number of
Owner Shares:
42,068 shares of                 /s/ Monica Griffin
Common Stock                     -------------------------------------------
                                 Monica Griffin


                                  OTHER OWNERS


Initial Number of
Owner Shares:
356,257 shares of                /s/ Kathlyn C. Smith
Common Stock                     -------------------------------------------
                                 Kathlyn C. Smith, Trustee of The Kathlyn C.
                                 Smith Revocable Trust Dated July 25, 1994




<PAGE>   1


                                                                    EXHIBIT 99.1

                             JOINT FILING STATEMENT

         Each of the undersigned agrees that (i) the Statement on Schedule 13D
relating to the Common Stock, par value, $0.01 per share, of Prize Energy Corp.
has been adopted and filed on behalf of each of them, (ii) all future amendments
to such Statement on Schedule 13D will, unless written notice to the contrary is
delivered as described below, be jointly filed on behalf of each of them and
(iii) the provisions of 13d-1(k)(1) under the Securities Exchange Act of 1934
apply to each of them. This Agreement may be terminated with respect to the
obligations to jointly file future amendments to such Statement on Schedule 13D
as to either of the undersigned upon such person giving written notice thereof
to the other person signatory hereto, at the principal office thereof.


Dated: February 18, 2000              PIONEER NATURAL RESOURCES COMPANY



                                      By:   /s/ Mark L. Withrow
                                         ---------------------------------------
                                      Name: Mark L. Withrow
                                      Title: Executive Vice President


Dated: February 18, 2000              PIONEER NATURAL RESOURCES USA, INC.



                                      By: /s/ Mark L. Withrow
                                         ---------------------------------------
                                      Name: Mark L. Withrow
                                      Title: Executive Vice President


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