Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  Pike Christopher
 2. Date of Event Requiring Statement (Month/Day/Year)
01/20/2006		 3. Issuer Name and Ticker or Trading Symbol
ASPEN TECHNOLOGY INC /DE/ [AZPN]
(Last)
(First)
(Middle)
C/O ADVENT INTERNATIONAL, 75 STATE STREET, 29TH FLOOR		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

BOSTON, MA 02109		 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Series D-1 Convertible Preferred Stock (1) 08/14/2003   (2) common stock 2,300 $ 0 (1) I see footnote (3)
Warrants to purchase Common Stock 08/14/2003 08/14/2010 common stock 465 $ 3.33 I see footnote (3)

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Pike Christopher
C/O ADVENT INTERNATIONAL
75 STATE STREET, 29TH FLOOR
BOSTON, MA 02109		   X      

Signatures

/s/ Janet L. Hennessy, Attorney-in-Fact 01/25/2006
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Each of the series D-1 shares is convertible into a number of shares of common stock equal to its stated value of $333.00 per share (subject to adjustment) divided by the conversion price of $3.33 (subject to adjustment).
(2) Shares may be converted into common stock on a perpetual basis.
(3) Shares are indirectly beneficially owned as a limited partner of Advent Partners GPE-IV Limited Partnership.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, See Instruction 6 for procedure.

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