X0202 4 2007-09-25 1 0001131096 ATHENAHEALTH INC ATHN 0001043889 CARDINAL HEALTH PARTNERS LP C/O CARDINAL PARTNERS 600 ALEXANDER PARK, SUITE 204 PRINCETON NJ 08540 0 0 1 0 0001357658 Cardinal Health Partners Management, L.L.C C/O CARDINAL PARTNERS 600 ALEXANDER PARK, SUITE 204 PRINCETON NJ 08540 0 0 1 0 0001219015 CLARKE JOHN K C/O CARDINAL PARTNERS 600 ALEXANDER PARK, SUITE 204 PRINCETON NJ 08540 0 0 1 0 0001357655 Tatum Lisa Skeete C/O CARDINAL PARTNERS 600 ALEXANDER PARK, SUITE 204 PRINCETON NJ 08540 0 0 1 0 0001357774 Park John Joseph C/O CARDINAL PARTNERS 600 ALEXANDER PARK, SUITE 204 PRINCETON NJ 08540 0 0 1 0 0001412662 CHP II Management, LLC C/O CARDINAL PARTNERS 600 ALEXANDER PARK, SUITE 204 PRINCETON NJ 08540 0 0 1 0 Common Stock 2007-09-25 4 C 0 1915246 0.00 A 1915246 I See Footnote. Common Stock 2007-09-25 4 C 0 1450944 0.00 A 1450944 I See Footnote. Common Stock 2007-09-25 4 S 0 383000 18.00 D 1532246 I See Footnote. Common Stock 2007-09-25 4 S 0 290000 18.00 D 1160944 I See Footnote. Series C preferred stock 2007-09-25 4 C 0 1915246 D 2007-09-25 Common Stock 1915246 0 I See Footnote. Series D preferred stock 2007-09-25 4 C 0 1450944 D 2007-09-25 Common Stock 1450944 0 I See Footnote. Cardinal Health Partners, L.P. is the record holder of the securities. As the general partner of Cardinal Health Partners, L.P., Cardinal Health Partners Management, L.L.C. may be deemed a beneficial owner of the securities. In their capacities as managing members of Cardinal Health Partners Management, L.L.C., each of John K. Clarke, Brandon H. Hull, Lisa Skeete Tatum and John J. Park may be deemed to be beneficial owners of the securities. Each Joint Filer, other than Cardinal Health Partners, L.P., expressly disclaims beneficial ownership of the securities, except to the extent of its pecuniary interest therein, if any. CHP II, L.P. is the record holder of the securities. As the general partner of CHP II, L.P., CHP II Management, L.L.C. may be deemed a beneficial owner of the securities. In their capacities as managing members of CHP II Management, L.L.C., each of John K. Clarke, Brandon H. Hull, Lisa Skeete Tatum and John J. Park may be deemed to be beneficial owners of the securities. Each Joint Filer, other than CHP II, L.P., expressly disclaims beneficial ownership of the securities, except to the extent of its pecuniary interest therein, if any. Shares sold pursuant to the initial public offering of common stock of athenahealth, Inc. through both the secondary offering and exercise of the over-allotment option by the underwriters. These shares automatically converted into common stock on a one-for-one basis upon the closing of the Issuer's initial public offering of common stock. The preferred stock has no expiration date. /s/ Christopher E. Nolin Attorney-in-Fact for all Reporting Persons 2007-09-25