| SC 13G/A | 2011-02-14 | FMR LLC | ATHENAHEALTH INC | 4,454,656 | 13.0% | EDGAR |
| SC 13G/A | 2011-02-14 | NEXT CENTURY GROWTH INVESTORS LLC | ATHENAHEALTH INC | 0 | 0.0% | EDGAR |
| SC 13G | 2011-02-14 | JANUS CAPITAL MANAGEMENT LLC | ATHENAHEALTH INC | 2,252,206 | 6.6% | EDGAR |
| SC 13G/A | 2011-02-11 | ARTISAN PARTNERS HOLDINGS LP | ATHENAHEALTH INC | 3,649,500 | 10.7% | EDGAR |
| SC 13G | 2011-02-11 | Capital Research Global Investors | ATHENAHEALTH INC | 1,927,700 | 5.6% | EDGAR |
| SC 13G | 2011-02-10 | TCW GROUP INC | ATHENAHEALTH INC | 2,302,334 | 6.7% | EDGAR |
| SC 13G/A | 2011-02-09 | MORGAN STANLEY | ATHENAHEALTH INC | 2,122,658 | 6.2% | EDGAR |
| SC 13G | 2011-02-02 | BlackRock Inc. | ATHENAHEALTH INC | 1,782,033 | 5.2% | EDGAR |
| SC 13G | 2011-01-21 | KORNITZER CAPITAL MANAGEMENT INC /KS | ATHENAHEALTH INC | 2,708,625 | 7.9% | EDGAR |
| SC 13G/A | 2010-09-10 | BlackRock Inc. | ATHENAHEALTH INC | 1,669,999 | 4.9% | EDGAR |
| SC 13G/A | 2010-04-09 | ARTISAN PARTNERS HOLDINGS LP | ATHENAHEALTH INC | 3,860,700 | 11.3% | EDGAR |
| SC 13G/A | 2010-02-16 | FMR LLC | ATHENAHEALTH INC | 2,792,439 | 8.3% | EDGAR |
| SC 13G/A | 2010-02-16 | VENROCK ASSOCIATES | ATHENAHEALTH INC | 0 | 0.0% | EDGAR |
| SC 13G/A | 2010-02-12 | NEXT CENTURY GROWTH INVESTORS LLC | ATHENAHEALTH INC | 452 | 4.5% | EDGAR |
| SC 13G | 2010-02-12 | MORGAN STANLEY | ATHENAHEALTH INC | 2,376,098 | 7.1% | EDGAR |
| SC 13G/A | 2010-02-11 | MARSICO CAPITAL MANAGEMENT LLC | ATHENAHEALTH INC | 826,680 | 2.5% | EDGAR |
| SC 13G | 2010-02-11 | ARTISAN PARTNERS HOLDINGS LP | ATHENAHEALTH INC | 2,964,000 | 8.8% | EDGAR |
| SC 13G | 2010-01-29 | BlackRock Inc. | ATHENAHEALTH INC | 1,703,602 | 5.1% | EDGAR |
| SC 13G/A | 2009-08-10 | GILDER GAGNON HOWE & CO LLC | ATHENAHEALTH INC | 909,946 | 2.7% | EDGAR |
| SC 13G/A | 2009-05-11 | FMR LLC | ATHENAHEALTH INC | 2,596,409 | 7.8% | EDGAR |