ABRAXAS PETROLEUM CORP
SC 13G/A, 1999-09-14
CRUDE PETROLEUM & NATURAL GAS
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934

                               (Amendment No. 2)*

                          ABRAXAS PETROLEUM CORPORATION
                                (Name of Issuer)

                           COMMON STOCK $.01 PAR VALUE
                         (Title of Class of Securities)

                                  COM003830106
                                 (CUSIP Number)

                                       N/A
             (Date of Event Which Requires Filing of this Statement)

Check the  appropriate box to designate the rule pursuant to which this Schedule
is filed:

       [ ]Rule 13d-1(b)

       [X]Rule 13d-1(c)

       [ ]Rule 13d-1(d)

Check the following box if a fee is being paid with this statement.

     *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 the disclosures provided in a prior cover page.

     The  information  required in 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
Notes).

<PAGE>

CUSIP NO. COM003830106          13G                         Page 2 of 10 Pages
          ------------                                          ---      -----
- --------------------------------------------------------------------------------


    1      NAME OF REPORTING PERSON
           S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                       Endowment Energy Partners, L.P.
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*           (a) [X]
                                                                       (b) [ ]
    3      SEC USE ONLY

    4      CITIZENSHIP OR PLACE OF ORGANIZATION

           Delaware
                                             5     SOLE VOTING POWER
                NUMBER OF
                                                   - 0 -
                 SHARES                      6     SHARED VOTING POWER
              BENEFICIALLY
                OWNED BY                           59,749
                  EACH                       7     SOLE DISPOSITIVE POWER
                REPORTING
                 PERSON                            - 0 -
                  WITH                       8     SHARED DISPOSITIVE POWER

                                                   59,749

    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           59,749

   10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
           [  ]*

   11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           0.9%

   12      TYPE OF REPORTING PERSON*

           PN
- ----------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>

CUSIP NO. COM003830106          13G                         Page 3 of 10 Pages
          ------------                                          ---      -----
- --------------------------------------------------------------------------------


    1      NAME OF REPORTING PERSON
           S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                      Endowment Energy Partners II, Limited Partnership

    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*           (a) [X]
                                                                       (b) [ ]

    3      SEC USE ONLY

    4      CITIZENSHIP OR PLACE OF ORGANIZATION

           Delaware
                                             5     SOLE VOTING POWER
                NUMBER OF
                                                   - 0 -
                 SHARES                      6     SHARED VOTING POWER
              BENEFICIALLY
                OWNED BY                           59,749
                  EACH                       7     SOLE DISPOSITIVE POWER
                REPORTING
                 PERSON                            - 0 -
                  WITH                       8     SHARED DISPOSITIVE POWER

                                                   59,749

    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           59,749
   10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
           [  ]*

   11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           0.9%
   12      TYPE OF REPORTING PERSON*

           PN
- ------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>

CUSIP NO. COM003830106          13G                         Page 4 of 10 Pages
          ------------                                          ---      -----
- --------------------------------------------------------------------------------


    1      NAME OF REPORTING PERSON
           S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                      Fairfield Partners Management LLC

    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*          (a) [X]
                                                                      (b) [ ]

    3      SEC USE ONLY

    4      CITIZENSHIP OR PLACE OF ORGANIZATION

           Delaware
                                             5     SOLE VOTING POWER
                NUMBER OF
                                                   - 0 -
                 SHARES                      6     SHARED VOTING POWER
              BENEFICIALLY
                OWNED BY                           59,749
                  EACH                       7     SOLE DISPOSITIVE POWER
                REPORTING
                 PERSON                            - 0 -
                  WITH                       8     SHARED DISPOSITIVE POWER

                                                   59,749

    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           59,749

   10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
           [  ]*


   11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           0.9%

   12      TYPE OF REPORTING PERSON*

           CO
- ----------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>

CUSIP NO. COM003830106          13G                         Page 5 of 10 Pages
          ------------                                          ---      -----
- --------------------------------------------------------------------------------


    1      NAME OF REPORTING PERSON
           S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                       Commonfund Capital, Inc.
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*           (a) [X ]
                                                                       (b) [  ]

    3      SEC USE ONLY

    4      CITIZENSHIP OR PLACE OF ORGANIZATION

           Delaware

                                            5     SOLE VOTING POWER
                NUMBER OF
                                                   - 0 -
                 SHARES                      6     SHARED VOTING POWER
              BENEFICIALLY
                OWNED BY                           59,749
                  EACH                       7     SOLE DISPOSITIVE POWER
                REPORTING
                 PERSON                            - 0 -
                  WITH                       8     SHARED DISPOSITIVE POWER

                                                   59,749

    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           59,749
   10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
           [  ]*


   11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           0.9%
   12      TYPE OF REPORTING PERSON*

                       CO
- -----------------------------
                     * SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>


                                                                  Page 6 of 10

                                  Schedule 13G
                         Filed Pursuant to Rule 13d-1(c)
                               Responses to Items

     This Schedule 13G is filed by and on behalf of Endowment  Energy  Partners,
L.P.,  Endowment  Energy Partners II, Limited  Partnership,  Fairfield  Partners
Management LLC (successor in interest of Fairfield  Partners,  Inc.  (Del.)) and
Commonfund  Capital,   Inc.  (formerly  known  as  Endowment   Advisers,   Inc.)
(collectively,  the  "Reporting  Persons").  The following  relationships  exist
between the Reporting  Persons:  (i) Fairfield  Partners  Management  LLC is the
general partner of Endowment Energy Partners, L.P. and Endowment Energy Partners
II,  Limited  Partnership  and (ii)  Fairfield  Partners  Management  LLC is the
wholly-owned subsidiary of Commonfund Capital, Inc. This Schedule 13G amends the
Schedule 13G filed by the Reporting  Persons with the  Commission on November 9,
1998, as amended on April 30, 1999 and is filed pursuant to Rule 13d-2(d).

Item 1 (a).       Name of Issuer:

                  Abraxas Petroleum Corporation

Item 1 (b).       Address of Issuer's Principal Executive Offices:

                   500 N. Loop 1604 East, Suite 100
                        San Antonio, Texas 78232

Item 2 (a).       Name of Person Filing:

                  Endowment Energy Partners, L.P.
                  Endowment Energy Partners II, Limited Partnership
                  Fairfield Partners Management LLC
                  Commonfund Capital, Inc.

Item 2 (b).       Address of Principal Business Office:

                  The  address of the  principal  office of each of the  persons
listed under Item 2(a) is:

                  450 Post Road East
                  Westport, Connecticut 06881-0909

Item 2 (c).       Citizenship:

                  Each of the persons listed under Item 2(a) is organized in the
State of Delaware.

Item 2 (d).       Title of Class of Securities:

                  Common Stock

Item 2 (e).       CUSIP Number:

                  COM003830106


<PAGE>


                                                                  Page 7 of 10


Item 3.          If this statement is filed pursuant to Rule 13d-1(b) or Rule
13d-2(b) or (c), check whether the person filing is a:

                (a)  [ ] Broker or dealer registered under section 15 of the
Exchange Act.

                (b)  [ ] Bank as defined in section 3(a)(6) of the Exchange Act.

                (c)  [ ] Insurance  company as defined in section 3(a)(19) of
the Exchange Act.

                (d)  [ ] Investment company registered under section 8 of the
Investment Company Act.

                (e)  [ ]  An  investment   adviser  in   accordance  with Rule
13d-1(b)(1)(ii)(E).

                (f)  [ ] An employee benefit plan or endowment fund in
accordance with Rule 13d-1(b)(1)(ii)(F).

                (g)  [ ] A parent holding  company or control person in
accordance with Rule 13d-1(b)(1)(ii)(G).

                (h)  [ ] A savings associations as defined in Section 3(b) of
the Federal Deposit Insurance Act.

                (i)  [ ]  A church plan that is excluded from the definition of
an investment company under section 3(c)(14) of the Investment Company Act.

                (j) [ ] Group, in accordance with Rule 13d-1(b)(1)(ii)(J).

                 If this statement is filed  pursuant to Rule  13d-1(c),  check
this box. [X]

Item 4.  Ownership.

                  (a)      Amount Beneficially Owned: See Item 9 of Cover Pages.

                  (b)      Percent of Class: See Item 11 of Cover Pages.

                  (c) Number of Shares as to which each person has:

                           (i)     sole power to vote or to direct the vote:
                                   See Item 5 of Cover Pages.

                           (ii)    shared power to vote or to direct the vote:
                                   See Item 6 of Cover Pages.

                           (iii)   sole power to dispose or to direct the
                                   disposition of:  See Item 7 of Cover Pages.

                           (iv)    shared power to dispose or to direct the
                                   disposition of: See Item 8 of Cover Pages.

<PAGE>


                                                                  Page 8 of 10

Item 5.  Ownership of Five Percent or Less of a Class.

                  Not applicable.

Item 6.  Ownership of More than Five Percent on Behalf of Another Person.

                  Not applicable.

Item 7.  Identification and Classification of the Subsidiary Which Acquired the
         Security Being Reported on By the Parent Holding Company.

                  Not applicable.

Item 8.  Identification and Classification of Members of the Group.

                  Not applicable.

Item 9.  Notice of Dissolution of Group.

                  Not applicable.

Item 10.          Certification.

     By  signing  the  below I certify  that,  to the best of my  knowledge  and
belief, the securities  referred to above were not acquired and are not held for
the purpose of or with the effect of changing or influencing  the control of the
issuer of the securities and were not acquired and are not in connection with or
as a participant in any transaction having that purpose or effect.


<PAGE>
                                                                  Page 9 of 10

                                    SIGNATURE

     After  reasonable  inquiry and to the best of our knowledge and belief,  we
certify that the information  set forth in this statement is true,  complete and
correct.

Dated: September 14, 1999

                       ENDOWMENT ENERGY PARTNERS, L.P.

                       By:      Fairfield Partners Management LLC, its General
                                Partner

                       By:        /s/ Linda A. Costa
                                ------------------------
                                Linda A. Costa
                                Chief Financial Officer and Treasurer


                       ENDOWMENT ENERGY PARTNERS II, LIMITED PARTNERSHIP

                       By:      Fairfield Partners Management LLC, its General
                                Partner

                       By:        /s/ Linda A. Costa
                                ------------------------
                                Linda A. Costa
                                Chief Financial Officer and Treasurer


                       FAIRFIELD PARTNERS MANAGEMENT LLC

                       By:        /s/ Linda A. Costa
                                ------------------------
                                Linda A. Costa
                                Chief Financial Officer and Treasurer


                       COMMONFUND CAPITAL, INC.

                       By:        /s/ Linda A. Costa
                                ------------------------
                                Linda A. Costa
                                Chief Financial Officer and Treasurer



<PAGE>


                                                                 Page 10 of 10

                            Exhibit A to Schedule 13G
                             Joint Filing Agreement
                          Pursuant to Rule 13d-1(k)(1)

     The undersigned  acknowledge  and agree that the foregoing  Schedule 13G is
filed on behalf of each of the undersigned and they are filing jointly, pursuant
to Rule  13d-1(k)(1)  of the Securities  Exchange Act of 1934,  the  information
required by Schedule 13G for the common stock of Abraxas  Petroleum  Corporation
beneficially owned by Endowment Energy Partners, L.P., Endowment Energy Partners
II,  Limited  Partnership,  Fairfield  Partners  Management  LLC, and Commonfund
Capital, Inc.

Dated:  September 14, 1999

                      ENDOWMENT ENERGY PARTNERS, L.P.

                      By:      Fairfield Partners Management LLC, its General
                               Partner

                      By:        /s/ Linda A. Costa
                                ------------------------
                                Linda A. Costa
                                Chief Financial Officer and Treasurer


                      ENDOWMENT ENERGY PARTNERS II, LIMITED PARTNERSHIP

                      By:      Fairfield Partners Management LLC, its General
                               Partner

                      By:      /s/ Linda A. Costa
                              ------------------------
                              Linda A. Costa
                              Chief Financial Officer and Treasurer


                       FAIRFIELD PARTNERS MANAGEMENT LLC

                       By:        /s/ Linda A. Costa
                                ------------------------
                                Linda A. Costa
                                Chief Financial Officer and Treasurer


                       COMMONFUND CAPITAL, INC.

                       By:        /s/ Linda A. Costa
                                ------------------------
                                Linda A. Costa
                                Chief Financial Officer and Treasurer





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