| Filed On | Filing |
|---|---|
| 09 May 2022 | SC 13G |
| 09 Nov 2020 | SC 13G |
| 11 May 2020 | SC 13G |
| 12 Feb 2019 | SC 13G |
| 15 Feb 2018 | NONE |
| 13 Feb 2018 | NONE |
| 16 Feb 2016 | SEC SCHEDULE 13G |
| 02 Feb 2016 | ASPEN TECHNOLOGY INC |
| 13 Feb 2013 | SC 13G |
| 30 Jan 2013 | SC 13G |
| 14 Feb 2012 | SC 13G |
| 11 Feb 2011 | SC 13G |
| 10 Feb 2011 | ASPEN TECHNOLOGY, INC 13G 123110 |
| 30 Sep 2010 | ASPEN TECHNOLOGY INITIAL13G - 093010 |
| 27 Sep 2010 | SC 13G |
| 15 Jan 2010 | ASPEN TECHNOLOGY |
| 12 Mar 2008 | INITIAL FILING |
| 16 Feb 2007 | SC 13G |
| 23 Jan 2007 | SC 13G |
| 10 Apr 2006 | DOC ONE |
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