UNITED STATES	OMB APPROVAL OMB Number: 3235-0080 Expires: March 31, 2018 Estimated average burden hours per response: 1.7
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 25
NOTIFICATION OF REMOVAL FROM LISTING AND/OR REGISTRATION UNDER SECTION 12(b) OF THE SECURITIES EXCHANGE ACT OF 1934.
Commission File Number	000-24786
Issuer: ASPEN TECHNOLOGY INC /DE/ Exchange: NASDAQ Stock Market LLC (Exact name of Issuer as specified in its charter, and name of Exchange where security is listed and/or registered) Address: Ten Canal Park Cambridge MASSACHUSETTS 02141 Telephone number: 617-949-1000 (Address, including zip code, and telephone number, including area code, of Issuer's principal executive offices) Common Stock (Description of class of securities)
Please place an X in the box to designate the rule provision relied upon to strike the class of securities from listing and registration:
17 CFR 240.12d2-2(a)(1) 17 CFR 240.12d2-2(a)(2) 17 CFR 240.12d2-2(a)(3) 17 CFR 240.12d2-2(a)(4) Pursuant to 17 CFR 240.12d2-2(b), the Exchange has complied with its rules to strike the class of securities from listing and/or withdraw registration on the Exchange. 1 Pursuant to 17 CFR 240.12d2-2(c), the Issuer has complied with its rules of the Exchange and the requirements of 17 CFR 240.12d-2(c) governing the voluntary withdrawal of the class of securities from listing and registration on the Exchange.
Pursuant to the requirements fo the Securities Exchange Act of 1934, NASDAQ Stock Market LLC certifies that it has reasonable grounds to believe that it meets all of the requirements for filing the Form 25 and has caused this notification to be signed on its behalf by the undersigned duly authorized person.
2008-04-23 By Amy Horton Associate General Counsel Date Name Title
1 Form 25 and attached Notice will be considered compliance with the provisions of 17 CFR 240.19d-1 as applicable. See General Instructions.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

Delisting Determination,The Nasdaq Stock Market, LLC,
April 23, 2008, Aspen Technology, Inc. The Nasdaq Stock Market,
Inc. (the Exchange) has determined to remove from
listing the common stock of Aspen Technology, Inc. (the
Company), effective at the opening of the trading
session on May 5, 2008. Based on a review of the
information provided by the Company, Nasdaq Staff
determined that the Company no longer qualified for
listing on the Exchange pursuant to Marketplace Rule
4310(c)(4). The Company was notified of the
Staffs determinations on Ocotber 1, 2007 and November
14, 2007. The Company requested a review of the
Staffs determination before the Listing
Qualifications Hearings Panel. Upon review of the
information provided by the Company, the Panel
determined that the Company did not qualify for
inclusion on the Exchange based on its failure to
comply with the following Marketplace Rules:
4310(c)(14).The Company was notified of the Panels
decision on February 14, 2008 and trading in the Companys
securities was suspended on February 19, 2008. The Company
did not request a review of the Panels decision by the
Nasdaq Listing and Hearing Review Council.
The Listing Council did not call the matter for
review. The Panels Determination to delist the Company
became final on March 31, 2008.