UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
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SCHEDULE 13D
Under the Securities Exchange Act of 1934
(Amendment No. 1)1
Pioneer Natural Resources Company*
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(Name of Issuer)
Common Stock, par value $.01 per share
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(Title of Class of Securities)
723787107
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(Cusip Number)
Scott B. Bernstein, Esq.
Caxton Corporation
315 Enterprise Drive
Plainsboro, NJ 08536
(609) 936-2580
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(Name, Address and Telephone Number of Person
Authorized to Receive Notices and Communications)
August 7, 1997
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(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 Rule 13d-1(b)(3) or (4), check the following box [ ].
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1 The remainder of this cover page shall be filled out for a reporting
persons'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 ("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.).
* Pioneer Natural Resources Company is the successor in interest to MESA Inc.
("MESA"). The initial Schedule 13D was filed with respect to the Common Stock,
$.01 par value, of MESA.
Page 1 of 5 Pages
<PAGE>
SCHEDULE 13D
CUSIP No. 723787107 Page 2 of 5 Pages
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1 NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Caxton International Limited
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2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ]
(b) [ ]
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3 SEC USE ONLY
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4 SOURCE OF FUNDS*
WC
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5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
ITEMS 2(d) or 2(e) [ ]
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6 CITIZENSHIP OR PLACE OF ORGANIZATION
British Virgin Islands
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NUMBER OF 7 SOLE VOTING POWER
SHARES 0
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BENEFICIALLY 8 SHARED VOTING POWER
OWNED BY 667,401
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EACH 9 SOLE DISPOSITIVE POWER
REPORTING 0
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PERSON 10 SHARED DISPOSITIVE POWER
WITH 667,401
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11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
667,401
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12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
[ ]
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13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
.9%
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14 TYPE OF REPORTING PERSON*
CO
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*SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
SCHEDULE 13D
CUSIP No. 723787107 Page 3 of 5 Pages
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1 NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Bruce S. Kovner
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2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ]
(b) [ ]
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3 SEC USE ONLY
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4 SOURCE OF FUNDS*
Not Applicable
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5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
ITEMS 2(d) or 2(e) [ ]
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6 CITIZENSHIP OR PLACE OF ORGANIZATION
United States
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NUMBER OF 7 SOLE VOTING POWER
SHARES 0
-------------------------------------------------------
BENEFICIALLY 8 SHARED VOTING POWER
OWNED BY 667,401
-------------------------------------------------------
EACH 9 SOLE DISPOSITIVE POWER
REPORTING 0
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PERSON 10 SHARED DISPOSITIVE
WITH 667,401
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11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
667,401
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12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
[ ]
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13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
.9%
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14 TYPE OF REPORTING PERSON*
IN
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*SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
This Amendment No. 1 amends the Schedule 13D filed with the Securities and
Exchange Commission on February 26, 1997 (the "Schedule 13D") by the Reporting
Persons, which Schedule 13D related to the Common Stock, par value $.01 per
share ("MESA Shares"), of MESA Inc., a Texas corporation ("MESA"). On August 7,
1997, MESA merged (the "Merger") with and into a subsidiary, Pioneer Natural
Resources Company, a Delaware corporation ("Pioneer"). Pursuant to the Merger,
MESA Shares and shares of MESA's Series A 8% Cumulative Convertible Preferred
Stock ("Preferred Shares") were converted into shares of Pioneer Common Stock,
par value $.01 per share ("Pioneer Shares").
Item 5. Interest in Securities of the Issuer.
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The information set forth in Item 5 ("Interest in Securities of the
Issuer"), subparagraph (a) of the Schedule 13D is hereby amended and
supplemented by adding the following information.
Pursuant to the Merger, 2,137,448 Preferred Shares owned by Caxton
International Limited were converted into 381,601 Pioneer Shares and 2,000,000
Mesa Shares were converted into 285,800 Pioneer Shares. Accordingly, as of the
close of business on September 3, 1997, Caxton International Limited
beneficially owned an aggregate of 667,401 Pioneer Shares representing
approximately .9% of the total Pioneer Shares outstanding.
Page 4 of 5 Pages
<PAGE>
SIGNATURE
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After reasonable inquiry and to the best of the undersigned's knowledge and
belief, the undersigned certify that the information set forth in this statement
is true, complete and correct.
Dated: September 4, 1997
CAXTON INTERNATIONAL LIMITED
By: /s/
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Nitin Aggarwal
President
By: /s/
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Maxwell Quin
Secretary
/s/
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Bruce S. Kovner, By Peter
D'Angelo, Attorney-In-Fact
Page 5 of 5 Pages
