| Filed On | Filing |
|---|---|
| 14 Feb 2018 | SC 13G/A |
| 08 Dec 2017 | SC 13G/A |
| 13 Sep 2017 | SC 13G/A |
| 10 Aug 2017 | 13G/A |
| 10 Apr 2017 | SC 13G/A |
| 13 Feb 2017 | SC 13G/A |
| 05 Jan 2017 | CONESTOGA CAPITAL ADVISORS |
| 11 Oct 2016 | FMR LLC SCHEDULE 13G/A |
| 16 Feb 2016 | SC 13G/A |
| 08 Feb 2016 | EXA CORPORATION |
| 05 Jan 2016 | CONESTOGA CAPITAL ADVISORS |
| 28 Aug 2015 | SC 13G/A |
| 10 Apr 2015 | SC 13G/A |
| 11 Feb 2015 | SC 13G/A |
| 06 Feb 2015 | EXA CORPORATION |
| 08 Dec 2014 | SC 13G/A |
| 13 Feb 2014 | EXA CORPORATION |
| 06 Feb 2014 | SC 13G/A |
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