| SC 13G/A | 2015-01-22 | THOMSON HORSTMANN & BRYANT INC | AtriCure, Inc. | 885,940 | 3.2% | EDGAR |
| SC 13G/A | 2014-02-13 | CAMDEN PARTNERS STRATEGIC II LLC | AtriCure, Inc. | 731,791 | 3.5% | EDGAR |
| SC 13G/A | 2014-02-05 | ADAGE CAPITAL PARTNERS GP LLC | AtriCure, Inc. | 1,212,204 | 5.8% | EDGAR |
| SC 13G | 2014-01-28 | BlackRock Inc. | AtriCure, Inc. | 1,068,425 | 5.1% | EDGAR |
| SC 13G | 2013-07-22 | ADAGE CAPITAL PARTNERS GP LLC | AtriCure, Inc. | 1,096,880 | 5.2% | EDGAR |
| SC 13D/A | 2013-06-03 | Discovery Group I, LLC | AtriCure, Inc. | 1,011,137 | 4.8% | EDGAR |
| SC 13D/A | 2013-03-26 | Discovery Group I, LLC | AtriCure, Inc. | 1,228,009 | 5.9% | EDGAR |
| SC 13D/A | 2013-02-15 | Discovery Group I, LLC | AtriCure, Inc. | 1,454,971 | 8.6% | EDGAR |
| SC 13G/A | 2013-02-11 | WASATCH ADVISORS INC | AtriCure, Inc. | - | - | EDGAR |
| SC 13G/A | 2013-02-06 | US VENTURE PARTNERS VIII L P | AtriCure, Inc. | 0 | 0.0% | EDGAR |
| SC 13D/A | 2012-12-19 | Discovery Group I, LLC | AtriCure, Inc. | 1,557,015 | 9.3% | EDGAR |
| SC 13D/A | 2012-09-13 | Drachman David J | AtriCure, Inc. | 511,208 | 3.1% | EDGAR |
| SC 13G/A | 2012-03-13 | CAMDEN PARTNERS STRATEGIC II LLC | AtriCure, Inc. | 931,790 | 5.7% | EDGAR |
| SC 13G/A | 2012-02-14 | WASATCH ADVISORS INC | AtriCure, Inc. | - | - | EDGAR |
| SC 13G/A | 2012-02-09 | Hooven Michael D | AtriCure, Inc. | 781,634 | 4.8% | EDGAR |
| SC 13D | 2011-03-25 | Drachman David J | AtriCure, Inc. | 891,527 | 5.4% | EDGAR |
| SC 13G | 2011-02-14 | WASATCH ADVISORS INC | AtriCure, Inc. | - | - | EDGAR |
| SC 13G/A | 2011-02-08 | Hooven Michael D | AtriCure, Inc. | 801,634 | 5.1% | EDGAR |
| SC 13G/A | 2011-02-08 | WELDON NORMAN R | AtriCure, Inc. | 599,364 | 3.8% | EDGAR |
| SC 13G/A | 2010-10-05 | Kairos Partners III Limited Partnership | AtriCure, Inc. | - | - | EDGAR |