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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. [     ])*
                                           -----




                             ASPEN TECHNOLOGY, INC.
--------------------------------------------------------------------------------
                                (Name of Issuer)


                    COMMON STOCK, PAR VALUE $0.10 PER SHARE
--------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                   045327103
--------------------------------------------------------------------------------
                                 (CUSIP Number)


                                  MAY 9, 2002
--------------------------------------------------------------------------------
            (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-(c)

[_]  Rule 13d-1(d)

---------------------------  ---------------------------
*    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 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 1 of 9 Pages



CUSIP No. 045327103                   13G                    Page 2  of  9 Pages


________________________________________________________________________________
1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)


     Cavallo Capital Corp.
________________________________________________________________________________
2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  [X]
                                                                 (b)  [_]

________________________________________________________________________________
3.   SEC USE ONLY



________________________________________________________________________________
4.   CITIZENSHIP OR PLACE OF ORGANIZATION


     New York
________________________________________________________________________________
  NUMBER OF    5.   SOLE VOTING POWER

   SHARES           0
               _________________________________________________________________
BENEFICIALLY   6.   SHARED VOTING POWER

  OWNED BY          2,940,100 (see Item 4)
               _________________________________________________________________
    EACH       7.   SOLE DISPOSITIVE POWER

  REPORTING         0
               _________________________________________________________________
   PERSON      8.   SHARED DISPOSITIVE POWER

    WITH            2,940,100 (see Item 4)
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON


     2,940,100 (see Item 4)
________________________________________________________________________________
10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                          [_]

________________________________________________________________________________
11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)


     8.1% (see Item 4)
________________________________________________________________________________
12.  TYPE OF REPORTING PERSON*


     CO
________________________________________________________________________________
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 2 of 9 Pages





CUSIP No. 045327103                   13G                    Page 3  of  9 Pages


________________________________________________________________________________
1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)


     Pine Ridge Financial 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


     British Virgin Islands
________________________________________________________________________________
  NUMBER OF    5.   SOLE VOTING POWER

   SHARES           0
               _________________________________________________________________
BENEFICIALLY   6.   SHARED VOTING POWER

  OWNED BY          2,940,100 (see Item 4)
               _________________________________________________________________
    EACH       7.   SOLE DISPOSITIVE POWER

  REPORTING         0
               _________________________________________________________________
   PERSON      8.   SHARED DISPOSITIVE POWER

    WITH            2,940,100 (see Item 4)
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON


     2,940,100 (see Item 4)
________________________________________________________________________________
10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                          [_]

________________________________________________________________________________
11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)


     8.1% (see Item 4)
________________________________________________________________________________
12.  TYPE OF REPORTING PERSON*


     CO
________________________________________________________________________________
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 3 of 9 Pages





Item 1.

         (a)      Name of Issuer:

                  Aspen Technology, Inc.

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

                  10 Canal Park
                  Cambridge, MA 02141

Item 2.

         (a)      Name of Persons Filing:

                  Cavallo Capital Corp. ("Cavallo")
                  Pine Ridge Financial Inc. ("Pine Ridge")

         (b)      Address of Principal Business Office:

                  Cavallo:
                  660 Madison Avenue, 18th floor
                  New York, NY 10021

                  Pine Ridge:
                  Gonzalez-Ruiz &Aleman (BVI) Limited, Wickhams Cay I,
                  Vanterpool Plaza
                  P.O. Box  873, Road Town
                  Tortolla, British Virgin Islands

         (c)      Citizenship:

                  Cavallo:
                  New York

                  Pine Ridge:
                  British Virgin Islands

         (d)      Title of Class of Securities:

                  Common Stock, par value $0.10 per share

         (e)      CUSIP Number:

                  045327103

Item 3.           If this  Statement  Is Filed  Pursuant to Rules  13d-1(b),  or
                  13d-2(b) or (c), Check Whether the Persons Filing are a:

         (a)      |_|   Broker  or dealer  registered  under  Section  15 of the
                        Exchange Act;


                                Page 4 of 9 Pages





         (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   advisor   in   accordance   with  Rule
                        13d-1(b)(1)(ii)(E);

         (f)      |_|   An  employee  benefit  plan  or  an  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  association 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 of 1940;

         (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

         Provide the following  information  regarding the aggregate  number and
         percentage of the class of securities of the issuer  identified in Item
         1.

         Cavallo:
         (a)      Amount Beneficially Owned:

                  2,940,100 shares of Common Stock1

----------------
1   Includes  2,098,600  shares of Common  Stock owned by Pine Ridge and 841,500
shares of Common Stock  issuable upon exercise of a Unit Warrant  issued to Pine
Ridge on May 9, 2002.  Excludes (i) 951,413 shares of Common Stock issuable upon
conversion of 19,000  shares of Series B-I  Convertible  Preferred  Stock of the
Issuer  ("Series B-I Stock") held by Pine Ridge,  (ii) 566,252  shares of Common
Stock  issuable  upon  conversion  of 10,000  shares of Series B-II  Convertible
Preferred  Stock of the Issuer  ("Series B-II Stock") held by Pine Ridge,  (iii)
182,927  shares of Common Stock  issuable upon  exercise of a Warrant  issued to
Pine Ridge on February 6, 2002,  (iv) 141,730  shares of Common  Stock  issuable
upon exercise of a Warrant issued to Pine Ridge on February 28, 2002, (v) 56,692
shares of Common Stock  issuable upon exercise of a Warrant issued to Pine Ridge
on March 19, 2002, (vi) 302,940 shares of Common Stock issuable upon exercise of
a Warrant  issued to Pine  Ridge on May 9,  2002,  and (vii)  151,470  shares of
Common Stock  issuable upon  exercise of an Additional  Warrant that is issuable
upon  exercise  of the Unit  Warrant  issued to Pine Ridge on
                                                                  (continued...)


                               Page 5 of 9 Pages





         (b)      Percent of Class:
                  8.1%2

         (c)      Number of shares as to which Cavallo has:

                  (i) Sole power to vote or to direct the vote:

                      0

                  (ii) Shared power to vote or to direct the vote:

                      2,940,100 shares of Common Stock (see Footnote 1)

                  (iii) Sole power to dispose or to direct the disposition of:

                      0

                  (iv) Shared power to dispose or to direct the disposition of:

                     2,940,100 shares of Common Stock (see Footnote 1)

         Pine Ridge:
         (a)      Amount Beneficially Owned:

                  2,940,100 shares of Common Stock3

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

1(...continued)
May 9, 2002.  Also excluded are (i) 300,447 shares of Common Stock issuable upon
conversion  of 6,000  shares  of  Series  B-I  Stock  held by  Perseverance  LLC
("Perseverance"),  (ii) 226,501 shares of Common Stock issuable upon  conversion
of 4,000 shares of Series B-II Stock held by  Perseverance,  (iii) 73,171 shares
of Common Stock  issuable upon exercise of a Warrant issued to  Perseverance  on
February 6, 2002,  and (iv) 56,692 shares of Common Stock issuable upon exercise
of a Warrant  issued to  Perseverance  on  February  28,  2002.  Pursuant  to an
agreement between Perseverance and Cavallo, Cavallo may be deemed as of the date
hereof to have  beneficial  ownership of the foregoing  securities of the Issuer
held by  Perseverance.  The terms of the Series B-I Stock, the Series B-II Stock
and all Warrants and the  Additional  Warrant  referred to above (other than the
Unit Warrant)  preclude the holder from converting or exercising such securities
to acquire any shares of Common Stock to the extent that the  acquisition  would
result in the holder and its affiliates  (and any other person whose  beneficial
ownership would be aggregated with the holder)  beneficially owning in excess of
4.999% of the outstanding shares of Common Stock following such exercise.

2   Based on 35,483,570  shares of Common Stock issued and outstanding as of May
9, 2002 as represented by the Issuer to Pine Ridge.

3   Includes  2,098,600  shares of Common  Stock owned by Pine Ridge and 841,500
shares of Common Stock  issuable upon exercise of a Unit Warrant  issued to Pine
Ridge on May 9, 2002.  Excludes (i) 951,413 shares of Common Stock issuable upon
conversion of 19,000 shares of Series B-I Stock held by Pine Ridge, (ii) 566,252
shares of Common Stock issuable upon  conversion of 10,000 shares of Series B-II
Stock held by Pine Ridge,  (iii)  182,927  shares of Common Stock  issuable upon
exercise of a Warrant  issued to Pine Ridge on February  6, 2002,  (iv)  141,730
shares of Common Stock issuable upon exercise of a Warrant issued
                                                                  (...continued)


                                Page 6 of 9 Pages






         (b)      Percent of Class:

                  8.1% (see Footnote 2)

         (c)      Number of Shares as to Which Pine Ridge has:

                  (i)   Sole power to vote or to direct the vote:

                        0

                  (ii)  Shared power to vote or to direct the vote:

                        2,940,100 shares of Common Stock (see Footnote 3)

                  (iii) Sole power to dispose or to direct the disposition of:

                        0

                  (iv)  Shared power to dispose or to direct the disposition of:

                        2,940,100 shares of Common Stock (see Footnote 3)

Item 5.           OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.

                  Inapplicable

Item 6.           OWNERSHIP  OF MORE THAN  FIVE  PERCENT  ON  BEHALF OF  ANOTHER
                  PERSON.

                  Pursuant to an investment  management  agreement  between Pine
                  Ridge and  Cavallo,  Cavallo  has the power to sell or vote on
                  behalf of Pine Ridge some or all of the shares of Common Stock
                  to  which  this  report  relates.   Accordingly,   under  Rule
                  13d-3(a),  Cavallo may be deemed to be the beneficial owner of
                  shares owned by Pine Ridge.


3(...continued)
to Pine Ridge on February 28, 2002,  (v) 56,692 shares of Common Stock  issuable
upon exercise of a Warrant issued to Pine Ridge on March 19, 2002,  (vi) 302,940
shares of Common Stock  issuable upon exercise of a Warrant issued to Pine Ridge
on May 9, 2002,  and (vii) 151,470 shares of Common Stock issuable upon exercise
of an  Additional  Warrant  that is issuable  upon  exercise of the Unit Warrant
issued to Pine  Ridge on May 9, 2002.  The terms of the  Series  B-I Stock,  the
Series B-II Stock and all Warrants and the Additional  Warrant referred to above
(other than the Unit Warrant)  preclude the holder from converting or exercising
such  securities  to acquire  any shares of Common  Stock to the extent that the
acquisition  would result in the holder and its affiliates (and any other person
whose  beneficial  ownership would be aggregated  with the holder)  beneficially
owning in excess of 4.999% of the  outstanding  shares of Common Stock following
such exercise.


                                Page 7 of 9 Pages





Item 7.           IDENTIFICATION  AND  CLASSIFICATION  OF THE  SUBSIDIARY  WHICH
                  ACQUIRED THE SECURITY  BEING REPORTED ON BY THE PARENT HOLDING
                  COMPANY.

                  Inapplicable

Item 8.           IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.

                  See the Joint Filing Agreement Attached hereto as an Exhibit.

Item 9.           NOTICE OF DISSOLUTION OF THE GROUP.

                  Inapplicable

Item 10.          CERTIFICATION.

                  By signing below the  undersigned  certifies that, to the best
of its 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  held in  connection  with or as a  participant  in any  transaction
having that purpose or effect.

                                    SIGNATURE

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

                                 Cavallo Capital Corp.

                                  /s/ Avi Vigder
                                 --------------------------------
                                 Name:  Avi Vigder
                                 Title: Managing Director


                                 Pine Ridge Financial Inc.

                                 By:  Cavallo Capital Corp., Investment Manager


                                  /s/  Avi Vigder
                                 --------------------------------
                                 Name:  Avi Vigder
                                 Title: Managing Director




                                Page 8 of 9 Pages





                             JOINT FILING AGREEMENT

         In accordance with rule  13d-1(k)(1) of the Securities  Exchange Act of
1934,  as amended,  the  undersigned  hereby agree to the joint filing with each
other of the attached statement on Schedule 13G, and all amendments thereto, and
that such statement,  and all amendments  thereto,  is made on behalf of each of
them.

         IN WITNESS WHEREOF,  the undersigned  hereby executed this agreement on
May 20, 2002.


                                 Cavallo Capital Corp.

                                  /s/ Avi Vigder
                                 --------------------------------
                                 Name:  Avi Vigder
                                 Title: Managing Director


                                 Pine Ridge Financial Inc.

                                 By:  Cavallo Capital Corp., Investment Manager


                                  /s/  Avi Vigder
                                 --------------------------------
                                 Name:  Avi Vigder
                                 Title: Managing Director




                               Page 9 of 9 Pages