| Filed On | Filing |
|---|---|
| 21 Dec 2018 | S-8 |
| 31 Jan 2017 | S-8 |
| 29 Sep 2010 | S-8 |
| 19 Sep 2005 | S-8 |
| 13 Sep 2004 | S-8 |
| 23 Jul 2004 | FORM S-8 |
| 23 Jul 2004 | FORM S-8 |
| 19 Oct 2001 | ASPEN TECHNOLOGY, INC. |
| 19 Oct 2001 | ASPEN TECHNOLOGY, INC. |
| 28 Jul 2000 | ASPEN TECHNOLOGY, INC. |
| 28 Jul 2000 | ASPEN TECHNOLOGY, INC. |
| 28 Jul 2000 | ASPEN TECHNOLOGY, INC. |
| 08 Jun 1999 | ASPEN TECHNOLOGY, INC. |
| 20 Jan 1998 | ASPEN TECHNOLOGY, INC |
| 11 Feb 1997 | ASPEN TECHNOLOGY, INC. |
| 09 Sep 1996 | ASPEN TECHNOLOGY, INC. |
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