X0304 4 2011-09-07 false 0000929940 ASPEN TECHNOLOGY INC /DE/ AZPN 0001197694 JENNINGS STEPHEN M ASPEN TECHNOLOGY, INC. 200 WHEELER ROAD BURLINGTON MA 01803 true false false false Common Stock 2011-09-07 4 M false 8000 15.04 A 24209 D Common Stock 2011-09-07 4 M false 3253 15.04 A 27462 D Common Stock 2011-09-07 4 S false 11253 16.6627 D 16209 D Director Stock Option (Right to Buy) 15.04 2011-09-07 4 M false 8000 0 D 2011-12-10 Common Stock 8000 0 D Director Stock Option (Right to Buy) 15.04 2011-09-07 4 M false 3253 0 D 2011-12-10 Common Stock 3253 0 D On the grant date, the option granted at the exercise price of $15.04 was scheduled to vest and become exercisable in four equal installments beginning with the third anniversary of the grant date, provided the optionee remained a director. The option became fully exercisable on August 14, 2003 upon the occurrence of a change in control as defined under the terms of the option plan, as amended. The option granted at the exercise price of $15.04 was fully vested on the date of grant. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $16.6593 to $16.67, inclusive. The reporting person undertakes to provide to Aspen Technology, Inc., any security holder of Aspen Technology, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. /s/ F.G. Hammond, Attorney-In-Fact 2011-09-08