CUSIP NO. 045327103               Schedule 13D                      Page 1 of 20


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

                                  SCHEDULE 13D
                                 (RULE 13d-101)

           INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO
                   RULE 13d-1(a) AND AMENDMENTS THERETO FILED
                            PURSUANT TO RULE 13d-2(a)
                              (AMENDMENT NO. 3)(1)

                             Aspen Technology, Inc.
                                (Name of issuer)

                          Common Stock, par value $0.10
                         (Title of class of securities)

                                    045327103
                                 (CUSIP number)

          Jarlyth H. Gibson, Assistant Compliance Officer 617-951-9493
        C/o Advent International Corporation, 75 State Street, 29th Floor
                                Boston, MA 02109
       (Name, Address and Telephone Number of Person Authorized to Receive
                           Notices and Communications)

                                December 14, 2006
             (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 that is the subject of this Schedule 13D, and is filing
this schedule because of Rule 13d-1(e), 13d-1(f) or 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 Rule 13d-7(b) for other
parties to whom copies are to be sent.

                         (Continued on following pages)
                              (Page 1 of 20 Pages)

----------
(1)  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 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).



CUSIP NO. 045327103               Schedule 13D                      Page 2 of 20


--------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)

     Advent International Corporation
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                   (A) [X]
                                                                         (B) [ ]
--------------------------------------------------------------------------------
3    SEC USE ONLY

--------------------------------------------------------------------------------
4    Source of Funds

     WC
--------------------------------------------------------------------------------
5    Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d)
     or 2(e)

--------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     Delaware
--------------------------------------------------------------------------------
                   7    SOLE VOTING POWER

                        31,499,336
                   -------------------------------------------------------------
   NUMBER OF       8    SHARED VOTING POWER
     SHARES
  BENEFICIALLY          None
    OWNED BY       -------------------------------------------------------------
      EACH         9    SOLE DISPOSITIVE POWER
REPORTING PERSON
      WITH              31,499,336
                   -------------------------------------------------------------
                   10   SHARED DISPOSITIVE POWER

                        None
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     31,499,336
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES    [ ]

--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     39.2%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     CO, IA
--------------------------------------------------------------------------------



CUSIP NO. 045327103               Schedule 13D                      Page 3 of 20


--------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)

     Advent International Limited Partnership
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                   (A) [X]
                                                                         (B) [ ]
--------------------------------------------------------------------------------
3    SEC USE ONLY

--------------------------------------------------------------------------------
4    Source of Funds

     WC
--------------------------------------------------------------------------------
5    Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d)
     or 2(e)

--------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     Delaware
--------------------------------------------------------------------------------
                   7    SOLE VOTING POWER

                        30,915,611
                   -------------------------------------------------------------
   NUMBER OF       8    SHARED VOTING POWER
     SHARES
  BENEFICIALLY          None
    OWNED BY       -------------------------------------------------------------
      EACH         9    SOLE DISPOSITIVE POWER
REPORTING PERSON
      WITH              30,915,611
                   -------------------------------------------------------------
                   10   SHARED DISPOSITIVE POWER

                        None
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     30,915,611
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES    [ ]

--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     38.7%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     PN
--------------------------------------------------------------------------------



CUSIP NO. 045327103               Schedule 13D                      Page 4 of 20


--------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)

     Global Private Equity IV Limited Partnership
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                   (A) [X]
                                                                         (B) [ ]
--------------------------------------------------------------------------------
3    SEC USE ONLY

--------------------------------------------------------------------------------
4    Source of Funds

     WC
--------------------------------------------------------------------------------
5    Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d)
     or 2(e)

--------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     Delaware
--------------------------------------------------------------------------------
                   7    SOLE VOTING POWER

                        15,397,758
                   -------------------------------------------------------------
   NUMBER OF       8    SHARED VOTING POWER
     SHARES
  BENEFICIALLY          None
    OWNED BY       -------------------------------------------------------------
      EACH         9    SOLE DISPOSITIVE POWER
REPORTING PERSON
      WITH              15,397,758
                   -------------------------------------------------------------
                   10   SHARED DISPOSITIVE POWER

                        None
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     15,397,758
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES    [ ]

--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     23.1%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     PN
--------------------------------------------------------------------------------



CUSIP NO. 045327103               Schedule 13D                      Page 5 of 20


--------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)

     Global Private Equity III Limited Partnership
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                   (A) [X]
                                                                         (B) [ ]
--------------------------------------------------------------------------------
3    SEC USE ONLY

--------------------------------------------------------------------------------
4    Source of Funds

     WC
--------------------------------------------------------------------------------
5    Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d)
     or 2(e)

--------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     Delaware
--------------------------------------------------------------------------------
                   7    SOLE VOTING POWER

                        4,409,908
                   -------------------------------------------------------------
   NUMBER OF       8    SHARED VOTING POWER
     SHARES
  BENEFICIALLY          None
    OWNED BY       -------------------------------------------------------------
      EACH         9    SOLE DISPOSITIVE POWER
REPORTING PERSON
      WITH              4,409,908
                   -------------------------------------------------------------
                   10   SHARED DISPOSITIVE POWER

                        None
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     4,409,908
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES    [ ]

--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     7.7%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     PN
--------------------------------------------------------------------------------



CUSIP NO. 045327103               Schedule 13D                      Page 6 of 20


--------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)

     Advent Partners GPE-IV Limited Partnership
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                   (A) [X]
                                                                         (B) [ ]
--------------------------------------------------------------------------------
3    SEC USE ONLY

--------------------------------------------------------------------------------
4    Source of Funds

     WC
--------------------------------------------------------------------------------
5    Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d)
     or 2(e)

--------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     Bermuda
--------------------------------------------------------------------------------
                   7    SOLE VOTING POWER

                        194,890
                   -------------------------------------------------------------
   NUMBER OF       8    SHARED VOTING POWER
     SHARES
  BENEFICIALLY          None
    OWNED BY       -------------------------------------------------------------
      EACH         9    SOLE DISPOSITIVE POWER
REPORTING PERSON
      WITH              194,890
                   -------------------------------------------------------------
                   10   SHARED DISPOSITIVE POWER

                        None
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     194,890
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES    [ ]

--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     0.4%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     PN
--------------------------------------------------------------------------------



CUSIP NO. 045327103               Schedule 13D                      Page 7 of 20


--------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)

     Advent PGGM Global Limited Partnership
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                   (A) [X]
                                                                         (B) [ ]
--------------------------------------------------------------------------------
3    SEC USE ONLY

--------------------------------------------------------------------------------
4    Source of Funds

     WC
--------------------------------------------------------------------------------
5    Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d)
     or 2(e)

--------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     Delaware
--------------------------------------------------------------------------------
                   7    SOLE VOTING POWER

                        440,969
                   -------------------------------------------------------------
   NUMBER OF       8    SHARED VOTING POWER
     SHARES
  BENEFICIALLY          None
    OWNED BY       -------------------------------------------------------------
      EACH         9    SOLE DISPOSITIVE POWER
REPORTING PERSON
      WITH              440,969
                   -------------------------------------------------------------
                   10   SHARED DISPOSITIVE POWER

                        None
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     440,969
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES    [ ]

--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     0.8%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     PN
--------------------------------------------------------------------------------



CUSIP NO. 045327103               Schedule 13D                      Page 8 of 20


--------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)

     Advent Partners GPE-III Limited Partnership
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                   (A) [X]
                                                                         (B) [ ]
--------------------------------------------------------------------------------
3    SEC USE ONLY

--------------------------------------------------------------------------------
4    Source of Funds

     WC
--------------------------------------------------------------------------------
5    Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d)
     or 2(e)

--------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     Delaware
--------------------------------------------------------------------------------
                   7    SOLE VOTING POWER

                        37,760
                   -------------------------------------------------------------
   NUMBER OF       8    SHARED VOTING POWER
     SHARES
  BENEFICIALLY          None
    OWNED BY       -------------------------------------------------------------
      EACH         9    SOLE DISPOSITIVE POWER
REPORTING PERSON
      WITH              37,760
                   -------------------------------------------------------------
                   10   SHARED DISPOSITIVE POWER

                        None
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     37,760
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES    [ ]

--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     0.1%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     PN
--------------------------------------------------------------------------------



CUSIP NO. 045327103               Schedule 13D                      Page 9 of 20


--------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)

     Advent Partners (NA) GPE-III Limited Partnership
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                   (A) [X]
                                                                         (B) [ ]
--------------------------------------------------------------------------------
3    SEC USE ONLY

--------------------------------------------------------------------------------
4    Source of Funds

     WC
--------------------------------------------------------------------------------
5    Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d)
     or 2(e)

--------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     Delaware
--------------------------------------------------------------------------------
                   7    SOLE VOTING POWER

                        11,223
                   -------------------------------------------------------------
   NUMBER OF       8    SHARED VOTING POWER
     SHARES
  BENEFICIALLY          None
    OWNED BY       -------------------------------------------------------------
      EACH         9    SOLE DISPOSITIVE POWER
REPORTING PERSON
      WITH              11,223
                   -------------------------------------------------------------
                   10   SHARED DISPOSITIVE POWER

                        None
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     11,223
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES    [ ]

--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     0.0%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     PN
--------------------------------------------------------------------------------



CUSIP NO. 045327103               Schedule 13D                     Page 10 of 20


--------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)

     Digital Media & Communications III Limited Partnership
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                   (A) [X]
                                                                         (B) [ ]
--------------------------------------------------------------------------------
3    SEC USE ONLY

--------------------------------------------------------------------------------
4    Source of Funds

     WC
--------------------------------------------------------------------------------
5    Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d)
     or 2(e)

--------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     Delaware
--------------------------------------------------------------------------------
                   7    SOLE VOTING POWER

                        2,036,076
                   -------------------------------------------------------------
   NUMBER OF       8    SHARED VOTING POWER
     SHARES
  BENEFICIALLY          None
    OWNED BY       -------------------------------------------------------------
      EACH         9    SOLE DISPOSITIVE POWER
REPORTING PERSON
      WITH              2,036,076
                   -------------------------------------------------------------
                   10   SHARED DISPOSITIVE POWER

                        None
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     2,036,076
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES    [ ]

--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     3.7%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     PN
--------------------------------------------------------------------------------


CUSIP NO. 045327103               Schedule 13D                     Page 11 of 20


--------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)

     Digital Media & Communications III-A Limited Partnership
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                   (A) [X]
                                                                         (B) [ ]
--------------------------------------------------------------------------------
3    SEC USE ONLY

--------------------------------------------------------------------------------
4    Source of Funds

     WC
--------------------------------------------------------------------------------
5    Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d)
     or 2(e)

--------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     Delaware
--------------------------------------------------------------------------------
                   7    SOLE VOTING POWER

                        1,008,020
                   -------------------------------------------------------------
   NUMBER OF       8    SHARED VOTING POWER
     SHARES
  BENEFICIALLY          None
    OWNED BY       -------------------------------------------------------------
      EACH         9    SOLE DISPOSITIVE POWER
REPORTING PERSON
      WITH              1,008,020
                   -------------------------------------------------------------
                   10   SHARED DISPOSITIVE POWER

                        None
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     1,008,020
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES    [ ]

--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     1.9%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     PN
--------------------------------------------------------------------------------



CUSIP NO. 045327103               Schedule 13D                     Page 12 of 20


--------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)

     Digital Media & Communications III-B Limited Partnership
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                   (A) [X]
                                                                         (B) [ ]
--------------------------------------------------------------------------------
3    SEC USE ONLY

--------------------------------------------------------------------------------
4    Source of Funds

     WC
--------------------------------------------------------------------------------
5    Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d)
     or 2(e)

--------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     Delaware
--------------------------------------------------------------------------------
                   7    SOLE VOTING POWER

                        251,952
                   -------------------------------------------------------------
   NUMBER OF       8    SHARED VOTING POWER
     SHARES
  BENEFICIALLY          None
    OWNED BY       -------------------------------------------------------------
      EACH         9    SOLE DISPOSITIVE POWER
REPORTING PERSON
      WITH              251,952
                   -------------------------------------------------------------
                   10   SHARED DISPOSITIVE POWER

                        None
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     251,952
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES    [ ]

--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     0.5%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     PN
--------------------------------------------------------------------------------



CUSIP NO. 045327103               Schedule 13D                     Page 13 of 20


--------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)

     Digital Media & Communications III-C Limited Partnership
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                   (A) [X]
                                                                         (B) [ ]
--------------------------------------------------------------------------------
3    SEC USE ONLY

--------------------------------------------------------------------------------
4    Source of Funds

     WC
--------------------------------------------------------------------------------
5    Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d)
     or 2(e)

--------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     Delaware
--------------------------------------------------------------------------------
                   7    SOLE VOTING POWER

                        4,031,978
                   -------------------------------------------------------------
   NUMBER OF       8    SHARED VOTING POWER
     SHARES
  BENEFICIALLY          None
    OWNED BY       -------------------------------------------------------------
      EACH         9    SOLE DISPOSITIVE POWER
REPORTING PERSON
      WITH              4,031,978
                   -------------------------------------------------------------
                   10   SHARED DISPOSITIVE POWER

                        None
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     4,031,978
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES    [ ]

--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     7.1%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     PN
--------------------------------------------------------------------------------



CUSIP NO. 045327103               Schedule 13D                     Page 14 of 20


--------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)

     Digital Media & Communications III-D C.V.
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                   (A) [X]
                                                                         (B) [ ]
--------------------------------------------------------------------------------
3    SEC USE ONLY

--------------------------------------------------------------------------------
4    Source of Funds

     WC
--------------------------------------------------------------------------------
5    Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d)
     or 2(e)

--------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     Netherlands
--------------------------------------------------------------------------------
                   7    SOLE VOTING POWER

                        755,963
                   -------------------------------------------------------------
   NUMBER OF       8    SHARED VOTING POWER
     SHARES
  BENEFICIALLY          None
    OWNED BY       -------------------------------------------------------------
      EACH         9    SOLE DISPOSITIVE POWER
REPORTING PERSON
      WITH              755,963
                   -------------------------------------------------------------
                   10   SHARED DISPOSITIVE POWER

                        None
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     755,963
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES    [ ]

--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     1.4%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     PN
--------------------------------------------------------------------------------



CUSIP NO. 045327103               Schedule 13D                     Page 15 of 20


--------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)

     Digital Media & Communications III-E C.V.
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                   (A) [X]
                                                                         (B) [ ]
--------------------------------------------------------------------------------
3    SEC USE ONLY

--------------------------------------------------------------------------------
4    Source of Funds

     WC
--------------------------------------------------------------------------------
5    Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d)
     or 2(e)

--------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     Netherlands
--------------------------------------------------------------------------------
                   7    SOLE VOTING POWER

                        504,010
                   -------------------------------------------------------------
   NUMBER OF       8    SHARED VOTING POWER
     SHARES
  BENEFICIALLY          None
    OWNED BY       -------------------------------------------------------------
      EACH         9    SOLE DISPOSITIVE POWER
REPORTING PERSON
      WITH              504,010
                   -------------------------------------------------------------
                   10   SHARED DISPOSITIVE POWER

                        None
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     504,010
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES    [ ]

--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     0.9%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     PN
--------------------------------------------------------------------------------



CUSIP NO. 045327103               Schedule 13D                     Page 16 of 20


--------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)

     Advent Partners DMC III Limited Partnership
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                   (A) [X]
                                                                         (B) [ ]
--------------------------------------------------------------------------------
3    SEC USE ONLY

--------------------------------------------------------------------------------
4    Source of Funds

     WC
--------------------------------------------------------------------------------
5    Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d)
     or 2(e)

--------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     Delaware
--------------------------------------------------------------------------------
                   7    SOLE VOTING POWER

                        116,850
                   -------------------------------------------------------------
   NUMBER OF       8    SHARED VOTING POWER
     SHARES
  BENEFICIALLY          None
    OWNED BY       -------------------------------------------------------------
      EACH         9    SOLE DISPOSITIVE POWER
REPORTING PERSON
      WITH              116,850
                   -------------------------------------------------------------
                   10   SHARED DISPOSITIVE POWER

                        None
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     116,850
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES    [ ]

--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     0.2%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     PN
--------------------------------------------------------------------------------



CUSIP NO. 045327103               Schedule 13D                     Page 17 of 20


--------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)

     Advent Energy II Limited Partnership
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                   (A) [X]
                                                                         (B) [ ]
--------------------------------------------------------------------------------
3    SEC USE ONLY

--------------------------------------------------------------------------------
4    Source of Funds

     WC
--------------------------------------------------------------------------------
5    Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d)
     or 2(e)

--------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     Delaware
--------------------------------------------------------------------------------
                   7    SOLE VOTING POWER

                        2,078,977
                   -------------------------------------------------------------
   NUMBER OF       8    SHARED VOTING POWER
     SHARES
  BENEFICIALLY          None
    OWNED BY       -------------------------------------------------------------
      EACH         9    SOLE DISPOSITIVE POWER
REPORTING PERSON
      WITH              2,078,977
                   -------------------------------------------------------------
                   10   SHARED DISPOSITIVE POWER

                        None
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     2,078,977
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES    [ ]

--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     3.8%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     PN
--------------------------------------------------------------------------------



CUSIP NO. 045327103               Schedule 13D                     Page 18 of 20


--------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)

     Advent Partners II Limited Partnership
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                   (A) [X]
                                                                         (B) [ ]
--------------------------------------------------------------------------------
3    SEC USE ONLY

--------------------------------------------------------------------------------
4    Source of Funds

     WC
--------------------------------------------------------------------------------
5    Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d)
     or 2(e)

--------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     Delaware
--------------------------------------------------------------------------------
                   7    SOLE VOTING POWER

                        223,002
                   -------------------------------------------------------------
   NUMBER OF       8    SHARED VOTING POWER
     SHARES
  BENEFICIALLY          None
    OWNED BY       -------------------------------------------------------------
      EACH         9    SOLE DISPOSITIVE POWER
REPORTING PERSON
      WITH              223,002
                   -------------------------------------------------------------
                   10   SHARED DISPOSITIVE POWER

                        None
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     223,002
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES    [ ]

--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     0.4%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     PN
--------------------------------------------------------------------------------



CUSIP NO. 045327103               Schedule 13D                     Page 19 of 20


                         Amendment No. 3 to Schedule 13D

     Reference is hereby made to the statement on Schedule 13D filed with the
Securities and Exchange Commission (the "Commission") on August 22, 2003, as
amended by Amendment No. 1 thereto filed with the Commission on June 6, 2006 and
Amendment No. 2 thereto filed with the commission on July 26, 2006 (as so
amended, the "Schedule 13D"). Terms defined in the Schedule 13D are used herein
as so defined.

Item 4. Purpose of the Transaction

     Item 4 is hereby amended by adding the following thereto after the first
paragraph of Item 4 contained in the Schedule 13D:

     On December 14, 2006, the Reporting Persons entered into Rule 10b5-1 Plans,
in the form filed as Exhibit A to this Amendment No. 3, relating to the proposed
sale of shares of Common Stock by UBS Securities LLC (the "Broker"). The Rule
10b5-1 Plans provide that the Broker may, commencing March 1, 2007, sell shares
of Common Stock in amounts up to the volume limitations set forth in Rule 144
promulgated under the Securities Act of 1933, as amended, at prices specified in
each Rule 10b5-1 Plan. The term of the Rule 10b5-1 Plans continues until August
27, 2007 (the date which is 180 days after March 1, 2007), unless terminated
earlier in accordance with the 10b5-1 Plans.

     The form of Rule 10b5-1 Plan is attached hereto as Exhibit A and any
description thereof is qualified in its entirety by reference thereto.

Item 6. Contracts, Arrangements, Understandings or Relationships with Respect to
     Securities of the Issuer

     Item 6 is hereby amended by adding the following thereto: On December 14,
2006, the Reporting Persons entered into the 10b5-1 Plans described above.

Item 7. Material to be Filed as Exhibits.

Exhibit A Form of Rule 10b5-1 Plans between the Reporting Persons and UBS
     Securities LLC.



CUSIP NO. 045327103               Schedule 13D                     Page 20 of 20


                                    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.

December 15, 2006

Global Private Equity IV Limited Partnership
Global Private Equity III Limited Partnership
Advent PGGM Global Limited Partnership
Digital Media & Communications III Limited Partnership
Digital Media & Communications III-A Limited Partnership
Digital Media & Communications III-B Limited Partnership
Digital Media & Communications III-C Limited Partnership
Digital Media & Communications III-D C.V.
Digital Media & Communications III-E C.V.
Advent Energy II Limited Partnership

By: Advent International Limited Partnership,
    General Partner
By: Advent International Corporation,
    General Partner
By: Jarlyth H. Gibson, Assistant Compliance Officer*

Advent International Limited Partnership
Advent Partners II Limited Partnership
Advent Partners GPE-IV Limited Partnership
Advent Partners GPE-III Limited Partnership
Advent Partners (NA) GPE-III Limited Partnership
Advent Partners DMC-III Limited Partnership

By: Advent International Corporation,
    General Partner
By: Jarlyth H. Gibson, Assistant Compliance Officer*

ADVENT INTERNATIONAL CORPORATION

By: Jarlyth H. Gibson, Assistant Compliance Officer*

*    For all of the above:

/s/ Jarlyth H. Gibson
-----------------------------------------------
Jarlyth H. Gibson, Assistant Compliance Officer