X0306 4 2012-12-03 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 2012-12-03 4 M false 3000 8.12 A 22337 D Common Stock 2012-12-03 4 M false 3000 8.28 A 25337 D Common Stock 2012-12-03 4 M false 3000 6.54 A 28337 D Common Stock 2012-12-03 4 M false 3000 7.06 A 31337 D Common Stock 2012-12-03 4 M false 3000 5.73 A 34337 D Common Stock 2012-12-03 4 M false 3000 5.56 A 37337 D Common Stock 2012-12-03 4 M false 3000 5.34 A 40337 D Common Stock 2012-12-03 4 M false 3000 13.51 A 43337 D Common Stock 2012-12-03 4 M false 3000 10.42 A 46337 D Common Stock 2012-12-03 4 M false 3300 10.93 A 49637 D Common Stock 2012-12-03 4 M false 6048 15.5 A 55685 D Common Stock 2012-12-03 4 M false 4010 23.38 A 59695 D Common Stock 2012-12-03 4 M false 3000 10.42 A 62695 D Common Stock 2012-12-03 4 S false 43358 26.0544 D 19337 D Director Stock Option (Right to Buy) 8.12 2012-12-03 4 M false 3000 0 D 2003-12-09 2013-12-08 Common Stock 3000 0 D Director Stock Option (Right to Buy) 8.28 2012-12-03 4 M false 3000 0 D 2004-03-31 2014-03-30 Common Stock 3000 0 D Director Stock Option (Right to Buy) 6.54 2012-12-03 4 M false 3000 0 D 2004-06-30 2014-06-29 Common Stock 3000 0 D Director Stock Option (Right to Buy) 7.06 2012-12-03 4 M false 3000 0 D 2004-09-30 2014-09-29 Common Stock 3000 0 D Director Stock Option (Right to Buy) 5.73 2012-12-03 4 M false 3000 0 D 2005-03-21 2015-03-20 Common Stock 3000 0 D Director Stock Option (Right to Buy) 5.56 2012-12-03 4 M false 3000 0 D 2005-03-31 2015-03-30 Common Stock 3000 0 D Director Stock Option (Right to Buy) 5.34 2012-12-03 4 M false 3000 0 D 2005-06-30 2015-06-29 Common Stock 3000 0 D Director Stock Option (Right to Buy) 13.51 2012-12-03 4 M false 3000 0 D 2006-05-12 2013-05-11 Common Stock 3000 0 D Director Stock Option (Right to Buy) 10.42 2012-12-03 4 M false 3000 0 D 2006-11-17 2013-11-16 Common Stock 3000 0 D Director Stock Option (Right to Buy) 10.93 2012-12-03 4 M false 3300 0 D 2010-08-02 2020-08-01 Common Stock 3300 0 D Director Stock Option (Right to Buy) 15.5 2012-12-03 4 M false 6048 0 D 2011-08-01 2021-07-31 Common Stock 6048 0 D Director Stock Option (Right to Buy) 23.38 2012-12-03 4 M false 4010 0 D 2012-08-01 2022-07-31 Common Stock 4010 0 D Director Stock Option (Right to Buy) 10.42 2012-12-03 4 M false 3000 0 D 2006-11-17 2013-11-16 Common Stock 3000 0 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $26.0143 to $26.1050, 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 2012-12-05