KILE LON C
SC 13D/A, 2000-04-10
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<PAGE>   1

                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                 SCHEDULE 13D/A

                   UNDER THE SECURITIES EXCHANGE ACT OF 1934
                               (AMENDMENT NO. 1)*


                               PRIZE ENERGY CORP.
- --------------------------------------------------------------------------------
                                (Name of Issuer)


                     COMMON STOCK, PAR VALUE $.01 PER SHARE
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                   74267L106
- --------------------------------------------------------------------------------
                                 (CUSIP Number)

                                  LON C. KILE
                              3500 WILLIAM D. TATE
                                   SUITE 200
                             GRAPEVINE, TEXAS 76051
                                 (817) 424-0406
- --------------------------------------------------------------------------------
                 (Name, Address and Telephone Number of Person
               Authorized to Receive Notices and Communications)

                               - with copies to -

                                 ROBERT A. CURRY
                                CONNER & WINTERS
                           A PROFESSIONAL CORPORATION
                             3700 FIRST PLACE TOWER
                                15 E. 5TH STREET
                           TULSA, OKLAHOMA 74103-4344
                                 (918) 586-5711

                                 MARCH 31, 2000
- --------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)


If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Section 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check
the following box [ ].

NOTE: Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See Section 240.13d-7(b) for
other parties to whom copies are to be sent.

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 (the "Act") or otherwise subject to the liabilities of that section of the
Act but shall be subject to all other provisions of the Act (however, see the
Notes).



<PAGE>   2

                                  SCHEDULE 13D
CUSIP NO. 74267L106                                                       PAGE 2

<TABLE>
- --------------------------------------------------------------------------------------------------------------------
<S>        <C>                                                                                               <C>
    1      NAMES OF REPORTING PERSONS
           I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

           LON C. KILE
- --------------------------------------------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                                  (a) [ ]
                                                                                                             (b) [ ]
- --------------------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY
- --------------------------------------------------------------------------------------------------------------------
    4      SOURCE OF FUNDS (See Instructions)                                                                     OO
- --------------------------------------------------------------------------------------------------------------------
    5      CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)                   [ ]
- --------------------------------------------------------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION

           UNITED STATES OF AMERICA
- --------------------------------------------------------------------------------------------------------------------
     NUMBER OF         7     SOLE VOTING POWER                                                               577,618
      SHARES           ---------------------------------------------------------------------------------------------
   BENEFICIALLY        8     SHARED VOTING POWER                                                                 -0-
   OWNED BY EACH       ---------------------------------------------------------------------------------------------
    REPORTING          9     SOLE DISPOSITIVE POWER                                                          577,618
     PERSON            ---------------------------------------------------------------------------------------------
      WITH             10    SHARED DISPOSITIVE POWER                                                            -0-
- --------------------------------------------------------------------------------------------------------------------
   11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON                                      577,618
- --------------------------------------------------------------------------------------------------------------------
   12      CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (See Instructions)                  [ ]
- --------------------------------------------------------------------------------------------------------------------
   13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)                                                  4.4%*
- --------------------------------------------------------------------------------------------------------------------
   14      TYPE OF REPORTING PERSON (See Instructions)                                                            IN
- --------------------------------------------------------------------------------------------------------------------
</TABLE>

* Assumes the conversion of 3,984,197 shares of Series A 6% Convertible
Preferred Stock of the Company owned by Pioneer Natural Resources USA, Inc. into
3,984,197 shares of Common Stock of the Company and the purchase by the Company
of 1,346,482 of such shares of Common Stock.



<PAGE>   3


                                  SCHEDULE 13D
CUSIP NO. 74267L106                                                       PAGE 3

     This Amendment No. 1 amends the Schedule 13D originally filed on February
17, 2000 (the "Schedule 13D"), by Lon C. Kile and relates to shares of common
stock, par value $.01 per share ("Common Stock"), of Prize Energy Corp.
(formerly known as Vista Energy Resources, Inc.), a Delaware corporation (the
"Company"). The Company's principal executive offices are located at 3500
William D. Tate, Suite 200, Grapevine, Texas 76051. Capitalized terms used
without definition in this Amendment No. 1 shall have the respective meanings
ascribed to them in the Schedule 13D. Use of the words "herein" and "hereof" are
references to the Schedule 13D, as amended by this Amendment No. 1.

ITEM 1.  SECURITY AND ISSUER

     No modification.

ITEM 2.  IDENTITY AND BACKGROUND

     No modification.

ITEM 3.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION

     Item 3 of the Schedule 13D is hereby amended by adding the following to the
end thereof:

     On March 31, 2000, a change in the percentage ownership of the Reporting
Person occurred solely as a result of the conversion of 3,984,197 shares of
Series A 6% Convertible Preferred Stock of the Company owned by Pioneer Natural
Resources USA, Inc. into 3,984,197 shares of Common Stock and the purchase by
the Company of 1,346,482 of such shares of Common Stock. Therefore, no funds or
consideration were expended by the Reporting Person.

ITEM 4.  PURPOSE OF THE TRANSACTION

     No modification.

ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER

     Parts (a), (b) and (e) of Item 5 of the Schedule 13D are hereby replaced in
their entirety as follows:

     (a) and (b) The Reporting Person is the beneficial owner of 577,618 shares
of Common Stock (the "Shares"), which represent 4.4% of the outstanding shares
of Common Stock. The Reporting Person has the sole power to vote and dispose of
the Shares. Of the Shares: (i) 41,916 are held by the Reporting Person in his
individual capacity; and (ii) 535,702 are issuable upon exercise of stock
options which are currently exercisable at an exercise price of $7.84 per share.



<PAGE>   4

                                  SCHEDULE 13D
CUSIP NO. 74267L106                                                       PAGE 4

     (e) On March 31, 2000, the Reporting Person ceased to be the beneficial
owner of more than five percent of the shares of Common Stock.

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

     No modification.

ITEM 7.  MATERIAL TO BE FILED AS EXHIBITS

     No modification.


                                    SIGNATURE

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


Dated: April 6, 2000                                 /s/ Lon C. Kile
                                                     ---------------
                                                     Lon C. Kile



The original statement shall be signed by each person on whose behalf the
statement is filed or his authorized representative. If the statement is signed
on behalf of a person by his authorized representative (other than the executive
officer or general partner of this filing person), evidence of the
representative's authority to sign on behalf of such person shall be filed with
the statement, provided, however, that a power of attorney for this purpose
which is already on file with the Commission may be incorporated by reference.
The name and any title of each person who signs the statement shall be typed or
printed beneath his signature.

     ATTENTION: INTENTIONAL MISSTATEMENTS OR OMISSIONS OF FACT CONSTITUTE
FEDERAL CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001).



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