| SC 13G/A | 2013-02-08 | BlackRock Inc. | ANSYS INC | 5,547,687 | 6.0% | EDGAR |
| SC 13G | 2012-08-08 | BROWN ADVISORY INC | ANSYS INC | 4,659,336 | 5.0% | EDGAR |
| SC 13G/A | 2012-02-14 | FMR LLC | ANSYS INC | 9,753,672 | 10.6% | EDGAR |
| SC 13G/A | 2012-02-13 | BlackRock Inc. | ANSYS INC | 4,888,574 | 5.3% | EDGAR |
| SC 13G/A | 2011-02-14 | FMR LLC | ANSYS INC | 7,536,681 | 8.3% | EDGAR |
| SC 13G/A | 2011-02-02 | BlackRock Inc. | ANSYS INC | 4,810,759 | 5.3% | EDGAR |
| SC 13G/A | 2010-02-16 | FMR LLC | ANSYS INC | 7,710,403 | 8.7% | EDGAR |
| SC 13G | 2010-01-29 | BlackRock Inc. | ANSYS INC | 4,531,730 | 5.1% | EDGAR |
| SC 13G/A | 2010-01-21 | EAGLE ASSET MANAGEMENT INC | ANSYS INC | 2,106,907 | 2.4% | EDGAR |
| SC 13G/A | 2009-02-17 | FMR LLC | ANSYS INC | 7,931,825 | 8.8% | EDGAR |
| SC 13G/A | 2009-02-03 | BARCLAYS GLOBAL INVESTORS NA /CA/ | ANSYS INC | 1,793,982 | 2.0% | EDGAR |
| SC 13G/A | 2009-01-27 | EAGLE ASSET MANAGEMENT INC | ANSYS INC | 3,675,838 | 5.4% | EDGAR |
| SC 13G/A | 2008-02-14 | FMR LLC | ANSYS INC | 8,361,671 | 10.7% | EDGAR |
| SC 13G | 2008-02-05 | BARCLAYS GLOBAL INVESTORS NA /CA/ | ANSYS INC | 1,592,076 | 2.0% | EDGAR |
| SC 13G/A | 2007-02-22 | EAGLE ASSET MANAGEMENT INC | ANSYS INC | 3,675,838 | 9.3% | EDGAR |
| SC 13G/A | 2007-02-14 | FMR CORP | ANSYS INC | 4,549,172 | 11.8% | EDGAR |
| SC 13G/A | 2007-01-18 | BARCLAYS GLOBAL INVESTORS NA /CA/ | ANSYS INC | 650,115 | 1.7% | EDGAR |
| SC 13D/A | 2006-11-21 | WILLIS STEIN & PARTNERS II L P | ANSYS INC | 140,567 | 0.4% | EDGAR |
| SC 13D | 2006-05-11 | WILLIS STEIN & PARTNERS II L P | ANSYS INC | 2,342,553 | 6.1% | EDGAR |
| SC 13G/A | 2006-05-10 | EARNEST PARTNERS LLC | ANSYS INC | 1,511,417 | 4.7% | EDGAR |