ABRAXAS PETROLEUM CORP
SC 13G, 1998-11-09
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. )*

                          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
                
                                                   - 0 -
                NUMBER OF
                 SHARES                      6     SHARED VOTING POWER
              BENEFICIALLY
                OWNED BY                           863,790
                  EACH
               REPORTING                     7     SOLE DISPOSITIVE POWER
                 PERSON                              
                  WITH                             - 0 - 

                                             8     SHARED DISPOSITIVE POWER

                                                   863,790

    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           863,790

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

   11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           13.8%

   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
                
                                                   - 0 -
                NUMBER OF
                 SHARES                      6     SHARED VOTING POWER
              BENEFICIALLY
                OWNED BY                           863,790
                  EACH                       
                REPORTING                    7     SOLE DISPOSITIVE POWER
                 PERSON
                  WITH                             - 0 -

                                             8     SHARED DISPOSITIVE POWER

                                                   863,790

    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           863,790

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

   11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           13.8%

   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, Inc. (Del.)
   
    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
                
                                                   - 0 -
                NUMBER OF                            
                 SHARES                      6     SHARED VOTING POWER
              BENEFICIALLY
                OWNED BY                           863,790
                  EACH
                REPORTING                    7     SOLE DISPOSITIVE POWER
                 PERSON
                  WITH                             - 0 -

                                             8     SHARED DISPOSITIVE POWER

                                                   863,790

    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           863,790

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

   11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           13.8%

   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
                
                                                   - 0 -
                NUMBER OF
                 SHARES                      6     SHARED VOTING POWER
              BENEFICIALLY
                OWNED BY                           863,790
                  EACH                       7     SOLE DISPOSITIVE POWER
                REPORTING
                 PERSON                            - 0 -
                  WITH                       8     SHARED DISPOSITIVE POWER

                                                   863,790

    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           863,790
   
   10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)EXCLUDES CERTAIN 
           SHARES [ ]*

   11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           13.8%

   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,
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,  Inc.  (Del.) is the
general partner of Endowment Energy Partners, L.P. and Endowment Energy Partners
II,  Limited  Partnership  and  (ii)  Fairfield  Partners,  Inc.  (Del.)  is the
wholly-owned  subsidiary of Commonfund Capital,  Inc. This Schedule 13G replaces
the Schedule 13D filed by the Reporting  Persons with the Commission on December
11,  1995 and is filed  pursuant to Rule  13d-1(h)  and the  determination  made
thereunder by the Reporting  Persons that the provisions of paragraphs  (e), (f)
and (g) of Rule 13d-1 do not apply to the  Reporting  Persons  and that they are
therefore eligible to file this Schedule 13G pursuant to Rule 13d-1(c).

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, Inc. (Del.)
                  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

<PAGE>
Page 7 of 10

Item 2 (e).       CUSIP Number:

                  COM003830106

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:  November 6, 1998

                        ENDOWMENT ENERGY PARTNERS, L.P.

                        By: Fairfield Partners, Inc. (Del.), its General Partner

                        By:  /s/ Susan J. Carter
                                 Susan J. Carter
                                 President and Chief Executive Officer


                        ENDOWMENT ENERGY PARTNERS II, LIMITED PARTNERSHIP

                        By: Fairfield Partners, Inc. (Del.), its General Partner

                        By:  /s/ Susan J. Carter      
                                 Susan J. Carter
                                 President and Chief Executive Officer


                        FAIRFIELD PARTNERS, INC. (DEL.)

                        By:  /s/ Susan J. Carter
                                 Susan J. Carter
                                 President and Chief Executive Officer


                        COMMONFUND CAPITAL, INC.

                        By:  /s/ Susan J. Carter      
                                 Susan J. Carter
                                 President and Chief Executive Officer


<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,  Inc. (Del.), and
Commonfund Capital, Inc.

Dated:  November 6, 1998


                        ENDOWMENT ENERGY PARTNERS, L.P.

                        By: Fairfield Partners, Inc. (Del.), its General Partner

                        By:  /s/ Susan J. Carter
                                 Susan J. Carter
                                 President and Chief Executive Officer


                        ENDOWMENT ENERGY PARTNERS II, LIMITED
                          PARTNERSHIP

                        By: Fairfield Partners, Inc. (Del.), its General Partner

                        By:  /s/ Susan J. Carter
                                 Susan J. Carter
                                 President and Chief Executive Officer


                        FAIRFIELD PARTNERS, INC. (DEL.)

                        By:  /s/ Susan J. Carter
                                 Susan J. Carter
                                 President and Chief Executive Officer


                        COMMONFUND CAPITAL, INC.

                        By:  /s/ Susan J. Carter
                                 Susan J. Carter
                                 President and Chief Executive Officer




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