SEC Form 3

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 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person* Pietri Antonio J (Last) (First) (Middle) C/O ASPEN TECHNOLOGY, INC. 200 WHEELER ROAD (Street) BURLINGTON MA 01803 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 07/25/2007	3. Issuer Name and Ticker or Trading Symbol ASPEN TECHNOLOGY INC /DE/ [ AZPN ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director 10% Owner X Officer (give title below) Other (specify below) EVP, Field Operations	5. If Amendment, Date of Original Filed (Month/Day/Year)
			6. Individual or Joint/Group Filing (Check Applicable Line) X Form filed by One Reporting Person Form filed by More than One Reporting Person

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)
Common Stock	270	I	By IRA
Common Stock	1,068	I	Held by spouse by IRA

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: 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
Common Stock Option (Right to Buy)	11/11/1998	09/11/2007	Common Stock	469	14.125	D
Common Stock Option (Right to Buy)	(1)	12/21/2007	Common Stock	4,000	14.125	D
Common Stock Option (Right to Buy)	(2)	09/01/2009	Common Stock	4,000	8.5	D
Common Stock Option (Right to Buy)	(3)	04/10/2011	Common Stock	6,000	14.05	D
Common Stock Option (Right to Buy)	(4)	08/17/2013	Common Stock	5,188	2.85	D
Common Stock Option (Right to Buy)	(5)	10/14/2014	Common Stock	18,213	6.57	D
Common Stock Option (Right to Buy)	(6)	10/14/2014	Common Stock	3,781	6.57	D
Common Stock Option (Right to Buy)	(7)	09/15/2015	Common Stock	14,567	5.27	D
Common Stock Option (Right to Buy)	(8)	09/15/2015	Common Stock	16,683	5.27	D
Common Stock Option (Right to Buy)	(9)	11/17/2016	Common Stock	8,640	10.42	D
Common Stock Option (Right to Buy)	(10)	11/17/2016	Common Stock	11,360	10.42	D
Restricted Stock Unit	(11)	11/17/2013	Common Stock	10,000	(12)	D

Explanation of Responses:

1. The options vested in 16 equal quarterly installments beginning on 3/31/99 and the balance on the last day of each quarter thereafter.

2. The options are part of an award of 5,000 options that vested in 16 alternating quarterly installments of 312 and 313 shares, respectively, beginning on 12/31/99 and on the last day of each quarter thereafter.

3. The options vested in 8 equal quarterly installments of 375 shares beginning on 9/30/01 and on the last day of each quarter thereafter, and an installment of 3,000 shares on 8/14/03.

4. The options vest in 2 equal installments on 6/30/07 and 9/30/07.

5. The options are part of an award of 46,219 options that vest in 13 installments of 3,125 shares on 12/31/04, 3/31/05, 6/30/05, 9/30/05, 3/31/06, 6/30/06, 9/30/06, 3/31/07, 6/30/07, 9/30/07, 3/31/08, 6/30/08 and 9/30/08; installments of 1,503 shares on 12/31/05 and 12/31/06;and an installment of 2,588 shares on 12/31/07.

6. The options vest in 2 installments of 1,622 shares on 12/31/05 and 12/31/06, and an installment of 537 shares on 12/31/07.

7. The options are part of an award of 33,317 options that vest in 10 equal quarterly installments of 3,125 shares beginning on 12/31/05 and on the last day of each quarter thereafter, with the exception of an installment of 2,067 shares on 9/30/08.

8. The options vest in 5 installments of 3,125 shares on 3/31/08, 6/30/08, 3/31/09, 6/30/09 and 9/30/09; and an installment of 1,058 shares on 9/30/08.

9. The options vest in 6 installments of 1,250 shares on 3/31/09, 6/30/09, 9/30/09, 3/31/2010, 6/30/2010 and 9/30/2010; and an installment of 1,140 shares on 12/31/09.

10. The options vest in 9 quarterly installments of 1,250 shares beginning on 12/29/06 and on the last day of each quarter thereafter, and a final installment of 110 shares on 12/31/09.

11. The restricted stock unit shall vest as to 25% upon achievement of specified performance goals in the fiscal year ending 6/30/07, and the balance in 12 equal quarterly installments thereafter.

12. Each restricted stock unit represents a contingent right to receive 1 share of Aspen Technology, Inc. common stock.

	/s/ Frederic G. Hammond, Attorney-in-Fact	08/02/2007
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
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